drivers/s390/block/dasd_eckd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd-eckd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/compat.h>
  22 #include <linux/init.h>
  23 #include <linux/seq_file.h>
  24
  25 #include <asm/css_chars.h>
  26 #include <asm/debug.h>
  27 #include <asm/idals.h>
  28 #include <asm/ebcdic.h>
  29 #include <asm/io.h>
  30 #include <linux/uaccess.h>
  31 #include <asm/cio.h>
  32 #include <asm/ccwdev.h>
  33 #include <asm/itcw.h>
  34 #include <asm/schid.h>
  35 #include <asm/chpid.h>
  36
  37 #include "dasd_int.h"
  38 #include "dasd_eckd.h"
  39
  40 #ifdef PRINTK_HEADER
  41 #undef PRINTK_HEADER
  42 #endif                          /* PRINTK_HEADER */
  43 #define PRINTK_HEADER "dasd(eckd):"
  44
  45 /*
  46  * raw track access always map to 64k in memory
  47  * so it maps to 16 blocks of 4k per track
  48  */
  49 #define DASD_RAW_BLOCK_PER_TRACK 16
  50 #define DASD_RAW_BLOCKSIZE 4096
  51 /* 64k are 128 x 512 byte sectors  */
  52 #define DASD_RAW_SECTORS_PER_TRACK 128
  53
  54 MODULE_LICENSE("GPL");
  55
  56 static struct dasd_discipline dasd_eckd_discipline;
  57
  58 /* The ccw bus type uses this table to find devices that it sends to
  59  * dasd_eckd_probe */
  60 static struct ccw_device_id dasd_eckd_ids[] = {
  61         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  62         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  63         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  64         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  65         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  66         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  67         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  68         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  69         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  70         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  71         { /* end of list */ },
  72 };
  73
  74 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  75
  76 static struct ccw_driver dasd_eckd_driver; /* see below */
  77
  78 static void *rawpadpage;
  79
  80 #define INIT_CQR_OK 0
  81 #define INIT_CQR_UNFORMATTED 1
  82 #define INIT_CQR_ERROR 2
  83
  84 /* emergency request for reserve/release */
  85 static struct {
  86         struct dasd_ccw_req cqr;
  87         struct ccw1 ccw;
  88         char data[32];
  89 } *dasd_reserve_req;
  90 static DEFINE_MUTEX(dasd_reserve_mutex);
  91
  92 static struct {
  93         struct dasd_ccw_req cqr;
  94         struct ccw1 ccw[2];
  95         char data[40];
  96 } *dasd_vol_info_req;
  97 static DEFINE_MUTEX(dasd_vol_info_mutex);
  98
  99 struct ext_pool_exhaust_work_data {
 100         struct work_struct worker;
 101         struct dasd_device *device;
 102         struct dasd_device *base;
 103 };
 104
 105 /* definitions for the path verification worker */
 106 struct pe_handler_work_data {
 107         struct work_struct worker;
 108         struct dasd_device *device;
 109         struct dasd_ccw_req cqr;
 110         struct ccw1 ccw;
 111         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 112         int isglobal;
 113         __u8 tbvpm;
 114         __u8 fcsecpm;
 115 };
 116 static struct pe_handler_work_data *pe_handler_worker;
 117 static DEFINE_MUTEX(dasd_pe_handler_mutex);
 118
 119 struct check_attention_work_data {
 120         struct work_struct worker;
 121         struct dasd_device *device;
 122         __u8 lpum;
 123 };
 124
 125 static int dasd_eckd_ext_pool_id(struct dasd_device *);
 126 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
 127                         struct dasd_device *, struct dasd_device *,
 128                         unsigned int, int, unsigned int, unsigned int,
 129                         unsigned int, unsigned int);
 130
 131 /* initial attempt at a probe function. this can be simplified once
 132  * the other detection code is gone */
 133 static int
 134 dasd_eckd_probe (struct ccw_device *cdev)
 135 {
 136         int ret;
 137
 138         /* set ECKD specific ccw-device options */
 139         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 140                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 141         if (ret) {
 142                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 143                                 "dasd_eckd_probe: could not set "
 144                                 "ccw-device options");
 145                 return ret;
 146         }
 147         ret = dasd_generic_probe(cdev);
 148         return ret;
 149 }
 150
 151 static int
 152 dasd_eckd_set_online(struct ccw_device *cdev)
 153 {
 154         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 155 }
 156
 157 static const int sizes_trk0[] = { 28, 148, 84 };
 158 #define LABEL_SIZE 140
 159
 160 /* head and record addresses of count_area read in analysis ccw */
 161 static const int count_area_head[] = { 0, 0, 0, 0, 1 };
 162 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 163
 164 static inline unsigned int
 165 ceil_quot(unsigned int d1, unsigned int d2)
 166 {
 167         return (d1 + (d2 - 1)) / d2;
 168 }
 169
 170 static unsigned int
 171 recs_per_track(struct dasd_eckd_characteristics * rdc,
 172                unsigned int kl, unsigned int dl)
 173 {
 174         int dn, kn;
 175
 176         switch (rdc->dev_type) {
 177         case 0x3380:
 178                 if (kl)
 179                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 180                                        ceil_quot(dl + 12, 32));
 181                 else
 182                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 183         case 0x3390:
 184                 dn = ceil_quot(dl + 6, 232) + 1;
 185                 if (kl) {
 186                         kn = ceil_quot(kl + 6, 232) + 1;
 187                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 188                                        9 + ceil_quot(dl + 6 * dn, 34));
 189                 } else
 190                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 191         case 0x9345:
 192                 dn = ceil_quot(dl + 6, 232) + 1;
 193                 if (kl) {
 194                         kn = ceil_quot(kl + 6, 232) + 1;
 195                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 196                                        ceil_quot(dl + 6 * dn, 34));
 197                 } else
 198                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 199         }
 200         return 0;
 201 }
 202
 203 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 204 {
 205         geo->cyl = (__u16) cyl;
 206         geo->head = cyl >> 16;
 207         geo->head <<= 4;
 208         geo->head |= head;
 209 }
 210
 211 /*
 212  * calculate failing track from sense data depending if
 213  * it is an EAV device or not
 214  */
 215 static int dasd_eckd_track_from_irb(struct irb *irb, struct dasd_device *device,
 216                                     sector_t *track)
 217 {
 218         struct dasd_eckd_private *private = device->private;
 219         u8 *sense = NULL;
 220         u32 cyl;
 221         u8 head;
 222
 223         sense = dasd_get_sense(irb);
 224         if (!sense) {
 225                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 226                               "ESE error no sense data\n");
 227                 return -EINVAL;
 228         }
 229         if (!(sense[27] & DASD_SENSE_BIT_2)) {
 230                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 231                               "ESE error no valid track data\n");
 232                 return -EINVAL;
 233         }
 234
 235         if (sense[27] & DASD_SENSE_BIT_3) {
 236                 /* enhanced addressing */
 237                 cyl = sense[30] << 20;
 238                 cyl |= (sense[31] & 0xF0) << 12;
 239                 cyl |= sense[28] << 8;
 240                 cyl |= sense[29];
 241         } else {
 242                 cyl = sense[29] << 8;
 243                 cyl |= sense[30];
 244         }
 245         head = sense[31] & 0x0F;
 246         *track = cyl * private->rdc_data.trk_per_cyl + head;
 247         return 0;
 248 }
 249
 250 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
 251                      struct dasd_device *device)
 252 {
 253         struct dasd_eckd_private *private = device->private;
 254         int rc;
 255
 256         rc = get_phys_clock(&data->ep_sys_time);
 257         /*
 258          * Ignore return code if XRC is not supported or
 259          * sync clock is switched off
 260          */
 261         if ((rc && !private->rdc_data.facilities.XRC_supported) ||
 262             rc == -EOPNOTSUPP || rc == -EACCES)
 263                 return 0;
 264
 265         /* switch on System Time Stamp - needed for XRC Support */
 266         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 267         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 268
 269         if (ccw) {
 270                 ccw->count = sizeof(struct DE_eckd_data);
 271                 ccw->flags |= CCW_FLAG_SLI;
 272         }
 273
 274         return rc;
 275 }
 276
 277 static int
 278 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 279               unsigned int totrk, int cmd, struct dasd_device *device,
 280               int blksize)
 281 {
 282         struct dasd_eckd_private *private = device->private;
 283         u16 heads, beghead, endhead;
 284         u32 begcyl, endcyl;
 285         int rc = 0;
 286
 287         if (ccw) {
 288                 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 289                 ccw->flags = 0;
 290                 ccw->count = 16;
 291                 ccw->cda = (__u32)__pa(data);
 292         }
 293
 294         memset(data, 0, sizeof(struct DE_eckd_data));
 295         switch (cmd) {
 296         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 297         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 298         case DASD_ECKD_CCW_READ:
 299         case DASD_ECKD_CCW_READ_MT:
 300         case DASD_ECKD_CCW_READ_CKD:
 301         case DASD_ECKD_CCW_READ_CKD_MT:
 302         case DASD_ECKD_CCW_READ_KD:
 303         case DASD_ECKD_CCW_READ_KD_MT:
 304                 data->mask.perm = 0x1;
 305                 data->attributes.operation = private->attrib.operation;
 306                 break;
 307         case DASD_ECKD_CCW_READ_COUNT:
 308                 data->mask.perm = 0x1;
 309                 data->attributes.operation = DASD_BYPASS_CACHE;
 310                 break;
 311         case DASD_ECKD_CCW_READ_TRACK:
 312         case DASD_ECKD_CCW_READ_TRACK_DATA:
 313                 data->mask.perm = 0x1;
 314                 data->attributes.operation = private->attrib.operation;
 315                 data->blk_size = 0;
 316                 break;
 317         case DASD_ECKD_CCW_WRITE:
 318         case DASD_ECKD_CCW_WRITE_MT:
 319         case DASD_ECKD_CCW_WRITE_KD:
 320         case DASD_ECKD_CCW_WRITE_KD_MT:
 321                 data->mask.perm = 0x02;
 322                 data->attributes.operation = private->attrib.operation;
 323                 rc = set_timestamp(ccw, data, device);
 324                 break;
 325         case DASD_ECKD_CCW_WRITE_CKD:
 326         case DASD_ECKD_CCW_WRITE_CKD_MT:
 327                 data->attributes.operation = DASD_BYPASS_CACHE;
 328                 rc = set_timestamp(ccw, data, device);
 329                 break;
 330         case DASD_ECKD_CCW_ERASE:
 331         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 332         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 333                 data->mask.perm = 0x3;
 334                 data->mask.auth = 0x1;
 335                 data->attributes.operation = DASD_BYPASS_CACHE;
 336                 rc = set_timestamp(ccw, data, device);
 337                 break;
 338         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 339                 data->mask.perm = 0x03;
 340                 data->attributes.operation = private->attrib.operation;
 341                 data->blk_size = 0;
 342                 break;
 343         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 344                 data->mask.perm = 0x02;
 345                 data->attributes.operation = private->attrib.operation;
 346                 data->blk_size = blksize;
 347                 rc = set_timestamp(ccw, data, device);
 348                 break;
 349         default:
 350                 dev_err(&device->cdev->dev,
 351                         "0x%x is not a known command\n", cmd);
 352                 break;
 353         }
 354
 355         data->attributes.mode = 0x3;    /* ECKD */
 356
 357         if ((private->rdc_data.cu_type == 0x2105 ||
 358              private->rdc_data.cu_type == 0x2107 ||
 359              private->rdc_data.cu_type == 0x1750)
 360             && !(private->uses_cdl && trk < 2))
 361                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 362
 363         heads = private->rdc_data.trk_per_cyl;
 364         begcyl = trk / heads;
 365         beghead = trk % heads;
 366         endcyl = totrk / heads;
 367         endhead = totrk % heads;
 368
 369         /* check for sequential prestage - enhance cylinder range */
 370         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 371             data->attributes.operation == DASD_SEQ_ACCESS) {
 372
 373                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 374                         endcyl += private->attrib.nr_cyl;
 375                 else
 376                         endcyl = (private->real_cyl - 1);
 377         }
 378
 379         set_ch_t(&data->beg_ext, begcyl, beghead);
 380         set_ch_t(&data->end_ext, endcyl, endhead);
 381         return rc;
 382 }
 383
 384
 385 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
 386                               unsigned int trk, unsigned int rec_on_trk,
 387                               int count, int cmd, struct dasd_device *device,
 388                               unsigned int reclen, unsigned int tlf)
 389 {
 390         struct dasd_eckd_private *private = device->private;
 391         int sector;
 392         int dn, d;
 393
 394         if (ccw) {
 395                 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
 396                 ccw->flags = 0;
 397                 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
 398                         ccw->count = 22;
 399                 else
 400                         ccw->count = 20;
 401                 ccw->cda = (__u32)__pa(data);
 402         }
 403
 404         memset(data, 0, sizeof(*data));
 405         sector = 0;
 406         if (rec_on_trk) {
 407                 switch (private->rdc_data.dev_type) {
 408                 case 0x3390:
 409                         dn = ceil_quot(reclen + 6, 232);
 410                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 411                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 412                         break;
 413                 case 0x3380:
 414                         d = 7 + ceil_quot(reclen + 12, 32);
 415                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 416                         break;
 417                 }
 418         }
 419         data->sector = sector;
 420         /* note: meaning of count depends on the operation
 421          *       for record based I/O it's the number of records, but for
 422          *       track based I/O it's the number of tracks
 423          */
 424         data->count = count;
 425         switch (cmd) {
 426         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 427                 data->operation.orientation = 0x3;
 428                 data->operation.operation = 0x03;
 429                 break;
 430         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 431                 data->operation.orientation = 0x3;
 432                 data->operation.operation = 0x16;
 433                 break;
 434         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 435                 data->operation.orientation = 0x1;
 436                 data->operation.operation = 0x03;
 437                 data->count++;
 438                 break;
 439         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 440                 data->operation.orientation = 0x3;
 441                 data->operation.operation = 0x16;
 442                 data->count++;
 443                 break;
 444         case DASD_ECKD_CCW_WRITE:
 445         case DASD_ECKD_CCW_WRITE_MT:
 446         case DASD_ECKD_CCW_WRITE_KD:
 447         case DASD_ECKD_CCW_WRITE_KD_MT:
 448                 data->auxiliary.length_valid = 0x1;
 449                 data->length = reclen;
 450                 data->operation.operation = 0x01;
 451                 break;
 452         case DASD_ECKD_CCW_WRITE_CKD:
 453         case DASD_ECKD_CCW_WRITE_CKD_MT:
 454                 data->auxiliary.length_valid = 0x1;
 455                 data->length = reclen;
 456                 data->operation.operation = 0x03;
 457                 break;
 458         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 459                 data->operation.orientation = 0x0;
 460                 data->operation.operation = 0x3F;
 461                 data->extended_operation = 0x11;
 462                 data->length = 0;
 463                 data->extended_parameter_length = 0x02;
 464                 if (data->count > 8) {
 465                         data->extended_parameter[0] = 0xFF;
 466                         data->extended_parameter[1] = 0xFF;
 467                         data->extended_parameter[1] <<= (16 - count);
 468                 } else {
 469                         data->extended_parameter[0] = 0xFF;
 470                         data->extended_parameter[0] <<= (8 - count);
 471                         data->extended_parameter[1] = 0x00;
 472                 }
 473                 data->sector = 0xFF;
 474                 break;
 475         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 476                 data->auxiliary.length_valid = 0x1;
 477                 data->length = reclen;  /* not tlf, as one might think */
 478                 data->operation.operation = 0x3F;
 479                 data->extended_operation = 0x23;
 480                 break;
 481         case DASD_ECKD_CCW_READ:
 482         case DASD_ECKD_CCW_READ_MT:
 483         case DASD_ECKD_CCW_READ_KD:
 484         case DASD_ECKD_CCW_READ_KD_MT:
 485                 data->auxiliary.length_valid = 0x1;
 486                 data->length = reclen;
 487                 data->operation.operation = 0x06;
 488                 break;
 489         case DASD_ECKD_CCW_READ_CKD:
 490         case DASD_ECKD_CCW_READ_CKD_MT:
 491                 data->auxiliary.length_valid = 0x1;
 492                 data->length = reclen;
 493                 data->operation.operation = 0x16;
 494                 break;
 495         case DASD_ECKD_CCW_READ_COUNT:
 496                 data->operation.operation = 0x06;
 497                 break;
 498         case DASD_ECKD_CCW_READ_TRACK:
 499                 data->operation.orientation = 0x1;
 500                 data->operation.operation = 0x0C;
 501                 data->extended_parameter_length = 0;
 502                 data->sector = 0xFF;
 503                 break;
 504         case DASD_ECKD_CCW_READ_TRACK_DATA:
 505                 data->auxiliary.length_valid = 0x1;
 506                 data->length = tlf;
 507                 data->operation.operation = 0x0C;
 508                 break;
 509         case DASD_ECKD_CCW_ERASE:
 510                 data->length = reclen;
 511                 data->auxiliary.length_valid = 0x1;
 512                 data->operation.operation = 0x0b;
 513                 break;
 514         default:
 515                 DBF_DEV_EVENT(DBF_ERR, device,
 516                             "fill LRE unknown opcode 0x%x", cmd);
 517                 BUG();
 518         }
 519         set_ch_t(&data->seek_addr,
 520                  trk / private->rdc_data.trk_per_cyl,
 521                  trk % private->rdc_data.trk_per_cyl);
 522         data->search_arg.cyl = data->seek_addr.cyl;
 523         data->search_arg.head = data->seek_addr.head;
 524         data->search_arg.record = rec_on_trk;
 525 }
 526
 527 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 528                       unsigned int trk, unsigned int totrk, int cmd,
 529                       struct dasd_device *basedev, struct dasd_device *startdev,
 530                       unsigned int format, unsigned int rec_on_trk, int count,
 531                       unsigned int blksize, unsigned int tlf)
 532 {
 533         struct dasd_eckd_private *basepriv, *startpriv;
 534         struct LRE_eckd_data *lredata;
 535         struct DE_eckd_data *dedata;
 536         int rc = 0;
 537
 538         basepriv = basedev->private;
 539         startpriv = startdev->private;
 540         dedata = &pfxdata->define_extent;
 541         lredata = &pfxdata->locate_record;
 542
 543         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 544         ccw->flags = 0;
 545         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 546                 ccw->count = sizeof(*pfxdata) + 2;
 547                 ccw->cda = (__u32) __pa(pfxdata);
 548                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 549         } else {
 550                 ccw->count = sizeof(*pfxdata);
 551                 ccw->cda = (__u32) __pa(pfxdata);
 552                 memset(pfxdata, 0, sizeof(*pfxdata));
 553         }
 554
 555         /* prefix data */
 556         if (format > 1) {
 557                 DBF_DEV_EVENT(DBF_ERR, basedev,
 558                               "PFX LRE unknown format 0x%x", format);
 559                 BUG();
 560                 return -EINVAL;
 561         }
 562         pfxdata->format = format;
 563         pfxdata->base_address = basepriv->ned->unit_addr;
 564         pfxdata->base_lss = basepriv->ned->ID;
 565         pfxdata->validity.define_extent = 1;
 566
 567         /* private uid is kept up to date, conf_data may be outdated */
 568         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
 569                 pfxdata->validity.verify_base = 1;
 570
 571         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
 572                 pfxdata->validity.verify_base = 1;
 573                 pfxdata->validity.hyper_pav = 1;
 574         }
 575
 576         rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
 577
 578         /*
 579          * For some commands the System Time Stamp is set in the define extent
 580          * data when XRC is supported. The validity of the time stamp must be
 581          * reflected in the prefix data as well.
 582          */
 583         if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
 584                 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid'   */
 585
 586         if (format == 1) {
 587                 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
 588                                   basedev, blksize, tlf);
 589         }
 590
 591         return rc;
 592 }
 593
 594 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 595                   unsigned int trk, unsigned int totrk, int cmd,
 596                   struct dasd_device *basedev, struct dasd_device *startdev)
 597 {
 598         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 599                           0, 0, 0, 0, 0);
 600 }
 601
 602 static void
 603 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 604               unsigned int rec_on_trk, int no_rec, int cmd,
 605               struct dasd_device * device, int reclen)
 606 {
 607         struct dasd_eckd_private *private = device->private;
 608         int sector;
 609         int dn, d;
 610
 611         DBF_DEV_EVENT(DBF_INFO, device,
 612                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 613                   trk, rec_on_trk, no_rec, cmd, reclen);
 614
 615         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 616         ccw->flags = 0;
 617         ccw->count = 16;
 618         ccw->cda = (__u32) __pa(data);
 619
 620         memset(data, 0, sizeof(struct LO_eckd_data));
 621         sector = 0;
 622         if (rec_on_trk) {
 623                 switch (private->rdc_data.dev_type) {
 624                 case 0x3390:
 625                         dn = ceil_quot(reclen + 6, 232);
 626                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 627                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 628                         break;
 629                 case 0x3380:
 630                         d = 7 + ceil_quot(reclen + 12, 32);
 631                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 632                         break;
 633                 }
 634         }
 635         data->sector = sector;
 636         data->count = no_rec;
 637         switch (cmd) {
 638         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 639                 data->operation.orientation = 0x3;
 640                 data->operation.operation = 0x03;
 641                 break;
 642         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 643                 data->operation.orientation = 0x3;
 644                 data->operation.operation = 0x16;
 645                 break;
 646         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 647                 data->operation.orientation = 0x1;
 648                 data->operation.operation = 0x03;
 649                 data->count++;
 650                 break;
 651         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 652                 data->operation.orientation = 0x3;
 653                 data->operation.operation = 0x16;
 654                 data->count++;
 655                 break;
 656         case DASD_ECKD_CCW_WRITE:
 657         case DASD_ECKD_CCW_WRITE_MT:
 658         case DASD_ECKD_CCW_WRITE_KD:
 659         case DASD_ECKD_CCW_WRITE_KD_MT:
 660                 data->auxiliary.last_bytes_used = 0x1;
 661                 data->length = reclen;
 662                 data->operation.operation = 0x01;
 663                 break;
 664         case DASD_ECKD_CCW_WRITE_CKD:
 665         case DASD_ECKD_CCW_WRITE_CKD_MT:
 666                 data->auxiliary.last_bytes_used = 0x1;
 667                 data->length = reclen;
 668                 data->operation.operation = 0x03;
 669                 break;
 670         case DASD_ECKD_CCW_READ:
 671         case DASD_ECKD_CCW_READ_MT:
 672         case DASD_ECKD_CCW_READ_KD:
 673         case DASD_ECKD_CCW_READ_KD_MT:
 674                 data->auxiliary.last_bytes_used = 0x1;
 675                 data->length = reclen;
 676                 data->operation.operation = 0x06;
 677                 break;
 678         case DASD_ECKD_CCW_READ_CKD:
 679         case DASD_ECKD_CCW_READ_CKD_MT:
 680                 data->auxiliary.last_bytes_used = 0x1;
 681                 data->length = reclen;
 682                 data->operation.operation = 0x16;
 683                 break;
 684         case DASD_ECKD_CCW_READ_COUNT:
 685                 data->operation.operation = 0x06;
 686                 break;
 687         case DASD_ECKD_CCW_ERASE:
 688                 data->length = reclen;
 689                 data->auxiliary.last_bytes_used = 0x1;
 690                 data->operation.operation = 0x0b;
 691                 break;
 692         default:
 693                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 694                               "opcode 0x%x", cmd);
 695         }
 696         set_ch_t(&data->seek_addr,
 697                  trk / private->rdc_data.trk_per_cyl,
 698                  trk % private->rdc_data.trk_per_cyl);
 699         data->search_arg.cyl = data->seek_addr.cyl;
 700         data->search_arg.head = data->seek_addr.head;
 701         data->search_arg.record = rec_on_trk;
 702 }
 703
 704 /*
 705  * Returns 1 if the block is one of the special blocks that needs
 706  * to get read/written with the KD variant of the command.
 707  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 708  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 709  * Luckily the KD variants differ only by one bit (0x08) from the
 710  * normal variant. So don't wonder about code like:
 711  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 712  *         ccw->cmd_code |= 0x8;
 713  */
 714 static inline int
 715 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 716 {
 717         if (recid < 3)
 718                 return 1;
 719         if (recid < blk_per_trk)
 720                 return 0;
 721         if (recid < 2 * blk_per_trk)
 722                 return 1;
 723         return 0;
 724 }
 725
 726 /*
 727  * Returns the record size for the special blocks of the cdl format.
 728  * Only returns something useful if dasd_eckd_cdl_special is true
 729  * for the recid.
 730  */
 731 static inline int
 732 dasd_eckd_cdl_reclen(int recid)
 733 {
 734         if (recid < 3)
 735                 return sizes_trk0[recid];
 736         return LABEL_SIZE;
 737 }
 738 /* create unique id from private structure. */
 739 static void create_uid(struct dasd_eckd_private *private)
 740 {
 741         int count;
 742         struct dasd_uid *uid;
 743
 744         uid = &private->uid;
 745         memset(uid, 0, sizeof(struct dasd_uid));
 746         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 747                sizeof(uid->vendor) - 1);
 748         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 749         memcpy(uid->serial, private->ned->HDA_location,
 750                sizeof(uid->serial) - 1);
 751         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 752         uid->ssid = private->gneq->subsystemID;
 753         uid->real_unit_addr = private->ned->unit_addr;
 754         if (private->sneq) {
 755                 uid->type = private->sneq->sua_flags;
 756                 if (uid->type == UA_BASE_PAV_ALIAS)
 757                         uid->base_unit_addr = private->sneq->base_unit_addr;
 758         } else {
 759                 uid->type = UA_BASE_DEVICE;
 760         }
 761         if (private->vdsneq) {
 762                 for (count = 0; count < 16; count++) {
 763                         sprintf(uid->vduit+2*count, "%02x",
 764                                 private->vdsneq->uit[count]);
 765                 }
 766         }
 767 }
 768
 769 /*
 770  * Generate device unique id that specifies the physical device.
 771  */
 772 static int dasd_eckd_generate_uid(struct dasd_device *device)
 773 {
 774         struct dasd_eckd_private *private = device->private;
 775         unsigned long flags;
 776
 777         if (!private)
 778                 return -ENODEV;
 779         if (!private->ned || !private->gneq)
 780                 return -ENODEV;
 781         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 782         create_uid(private);
 783         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 784         return 0;
 785 }
 786
 787 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 788 {
 789         struct dasd_eckd_private *private = device->private;
 790         unsigned long flags;
 791
 792         if (private) {
 793                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 794                 *uid = private->uid;
 795                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 796                 return 0;
 797         }
 798         return -EINVAL;
 799 }
 800
 801 /*
 802  * compare device UID with data of a given dasd_eckd_private structure
 803  * return 0 for match
 804  */
 805 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 806                                       struct dasd_eckd_private *private)
 807 {
 808         struct dasd_uid device_uid;
 809
 810         create_uid(private);
 811         dasd_eckd_get_uid(device, &device_uid);
 812
 813         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 814 }
 815
 816 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 817                                    struct dasd_ccw_req *cqr,
 818                                    __u8 *rcd_buffer,
 819                                    __u8 lpm)
 820 {
 821         struct ccw1 *ccw;
 822         /*
 823          * buffer has to start with EBCDIC "V1.0" to show
 824          * support for virtual device SNEQ
 825          */
 826         rcd_buffer[0] = 0xE5;
 827         rcd_buffer[1] = 0xF1;
 828         rcd_buffer[2] = 0x4B;
 829         rcd_buffer[3] = 0xF0;
 830
 831         ccw = cqr->cpaddr;
 832         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 833         ccw->flags = 0;
 834         ccw->cda = (__u32)(addr_t)rcd_buffer;
 835         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 836         cqr->magic = DASD_ECKD_MAGIC;
 837
 838         cqr->startdev = device;
 839         cqr->memdev = device;
 840         cqr->block = NULL;
 841         cqr->expires = 10*HZ;
 842         cqr->lpm = lpm;
 843         cqr->retries = 256;
 844         cqr->buildclk = get_tod_clock();
 845         cqr->status = DASD_CQR_FILLED;
 846         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 847 }
 848
 849 /*
 850  * Wakeup helper for read_conf
 851  * if the cqr is not done and needs some error recovery
 852  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 853  * to show support for virtual device SNEQ
 854  */
 855 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 856 {
 857         struct ccw1 *ccw;
 858         __u8 *rcd_buffer;
 859
 860         if (cqr->status !=  DASD_CQR_DONE) {
 861                 ccw = cqr->cpaddr;
 862                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 863                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 864
 865                 rcd_buffer[0] = 0xE5;
 866                 rcd_buffer[1] = 0xF1;
 867                 rcd_buffer[2] = 0x4B;
 868                 rcd_buffer[3] = 0xF0;
 869         }
 870         dasd_wakeup_cb(cqr, data);
 871 }
 872
 873 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 874                                            struct dasd_ccw_req *cqr,
 875                                            __u8 *rcd_buffer,
 876                                            __u8 lpm)
 877 {
 878         struct ciw *ciw;
 879         int rc;
 880         /*
 881          * sanity check: scan for RCD command in extended SenseID data
 882          * some devices do not support RCD
 883          */
 884         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 885         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 886                 return -EOPNOTSUPP;
 887
 888         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 889         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 890         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 891         cqr->retries = 5;
 892         cqr->callback = read_conf_cb;
 893         rc = dasd_sleep_on_immediatly(cqr);
 894         return rc;
 895 }
 896
 897 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 898                                    void **rcd_buffer,
 899                                    int *rcd_buffer_size, __u8 lpm)
 900 {
 901         struct ciw *ciw;
 902         char *rcd_buf = NULL;
 903         int ret;
 904         struct dasd_ccw_req *cqr;
 905
 906         /*
 907          * sanity check: scan for RCD command in extended SenseID data
 908          * some devices do not support RCD
 909          */
 910         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 911         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 912                 ret = -EOPNOTSUPP;
 913                 goto out_error;
 914         }
 915         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 916         if (!rcd_buf) {
 917                 ret = -ENOMEM;
 918                 goto out_error;
 919         }
 920         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 921                                    0, /* use rcd_buf as data ara */
 922                                    device, NULL);
 923         if (IS_ERR(cqr)) {
 924                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 925                               "Could not allocate RCD request");
 926                 ret = -ENOMEM;
 927                 goto out_error;
 928         }
 929         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 930         cqr->callback = read_conf_cb;
 931         ret = dasd_sleep_on(cqr);
 932         /*
 933          * on success we update the user input parms
 934          */
 935         dasd_sfree_request(cqr, cqr->memdev);
 936         if (ret)
 937                 goto out_error;
 938
 939         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 940         *rcd_buffer = rcd_buf;
 941         return 0;
 942 out_error:
 943         kfree(rcd_buf);
 944         *rcd_buffer = NULL;
 945         *rcd_buffer_size = 0;
 946         return ret;
 947 }
 948
 949 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 950 {
 951
 952         struct dasd_sneq *sneq;
 953         int i, count;
 954
 955         private->ned = NULL;
 956         private->sneq = NULL;
 957         private->vdsneq = NULL;
 958         private->gneq = NULL;
 959         count = private->conf_len / sizeof(struct dasd_sneq);
 960         sneq = (struct dasd_sneq *)private->conf_data;
 961         for (i = 0; i < count; ++i) {
 962                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 963                         private->sneq = sneq;
 964                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 965                         private->vdsneq = (struct vd_sneq *)sneq;
 966                 else if (sneq->flags.identifier == 2)
 967                         private->gneq = (struct dasd_gneq *)sneq;
 968                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 969                         private->ned = (struct dasd_ned *)sneq;
 970                 sneq++;
 971         }
 972         if (!private->ned || !private->gneq) {
 973                 private->ned = NULL;
 974                 private->sneq = NULL;
 975                 private->vdsneq = NULL;
 976                 private->gneq = NULL;
 977                 return -EINVAL;
 978         }
 979         return 0;
 980
 981 };
 982
 983 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 984 {
 985         struct dasd_gneq *gneq;
 986         int i, count, found;
 987
 988         count = conf_len / sizeof(*gneq);
 989         gneq = (struct dasd_gneq *)conf_data;
 990         found = 0;
 991         for (i = 0; i < count; ++i) {
 992                 if (gneq->flags.identifier == 2) {
 993                         found = 1;
 994                         break;
 995                 }
 996                 gneq++;
 997         }
 998         if (found)
 999                 return ((char *)gneq)[18] & 0x07;
1000         else
1001                 return 0;
1002 }
1003
1004 static void dasd_eckd_store_conf_data(struct dasd_device *device,
1005                                       struct dasd_conf_data *conf_data, int chp)
1006 {
1007         struct channel_path_desc_fmt0 *chp_desc;
1008         struct subchannel_id sch_id;
1009
1010         ccw_device_get_schid(device->cdev, &sch_id);
1011         /*
1012          * path handling and read_conf allocate data
1013          * free it before replacing the pointer
1014          */
1015         kfree(device->path[chp].conf_data);
1016         device->path[chp].conf_data = conf_data;
1017         device->path[chp].cssid = sch_id.cssid;
1018         device->path[chp].ssid = sch_id.ssid;
1019         chp_desc = ccw_device_get_chp_desc(device->cdev, chp);
1020         if (chp_desc)
1021                 device->path[chp].chpid = chp_desc->chpid;
1022         kfree(chp_desc);
1023 }
1024
1025 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1026 {
1027         struct dasd_eckd_private *private = device->private;
1028         int i;
1029
1030         private->conf_data = NULL;
1031         private->conf_len = 0;
1032         for (i = 0; i < 8; i++) {
1033                 kfree(device->path[i].conf_data);
1034                 device->path[i].conf_data = NULL;
1035                 device->path[i].cssid = 0;
1036                 device->path[i].ssid = 0;
1037                 device->path[i].chpid = 0;
1038                 dasd_path_notoper(device, i);
1039                 dasd_path_remove_kobj(device, i);
1040         }
1041 }
1042
1043 static void dasd_eckd_read_fc_security(struct dasd_device *device)
1044 {
1045         struct dasd_eckd_private *private = device->private;
1046         u8 esm_valid;
1047         u8 esm[8];
1048         int chp;
1049         int rc;
1050
1051         rc = chsc_scud(private->uid.ssid, (u64 *)esm, &esm_valid);
1052         if (rc) {
1053                 for (chp = 0; chp < 8; chp++)
1054                         device->path[chp].fc_security = 0;
1055                 return;
1056         }
1057
1058         for (chp = 0; chp < 8; chp++) {
1059                 if (esm_valid & (0x80 >> chp))
1060                         device->path[chp].fc_security = esm[chp];
1061                 else
1062                         device->path[chp].fc_security = 0;
1063         }
1064 }
1065
1066 static int dasd_eckd_read_conf(struct dasd_device *device)
1067 {
1068         void *conf_data;
1069         int conf_len, conf_data_saved;
1070         int rc, path_err, pos;
1071         __u8 lpm, opm;
1072         struct dasd_eckd_private *private, path_private;
1073         struct dasd_uid *uid;
1074         char print_path_uid[60], print_device_uid[60];
1075
1076         private = device->private;
1077         opm = ccw_device_get_path_mask(device->cdev);
1078         conf_data_saved = 0;
1079         path_err = 0;
1080         /* get configuration data per operational path */
1081         for (lpm = 0x80; lpm; lpm>>= 1) {
1082                 if (!(lpm & opm))
1083                         continue;
1084                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1085                                              &conf_len, lpm);
1086                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1087                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1088                                         "Read configuration data returned "
1089                                         "error %d", rc);
1090                         return rc;
1091                 }
1092                 if (conf_data == NULL) {
1093                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1094                                         "No configuration data "
1095                                         "retrieved");
1096                         /* no further analysis possible */
1097                         dasd_path_add_opm(device, opm);
1098                         continue;       /* no error */
1099                 }
1100                 /* save first valid configuration data */
1101                 if (!conf_data_saved) {
1102                         /* initially clear previously stored conf_data */
1103                         dasd_eckd_clear_conf_data(device);
1104                         private->conf_data = conf_data;
1105                         private->conf_len = conf_len;
1106                         if (dasd_eckd_identify_conf_parts(private)) {
1107                                 private->conf_data = NULL;
1108                                 private->conf_len = 0;
1109                                 kfree(conf_data);
1110                                 continue;
1111                         }
1112                         /*
1113                          * build device UID that other path data
1114                          * can be compared to it
1115                          */
1116                         dasd_eckd_generate_uid(device);
1117                         conf_data_saved++;
1118                 } else {
1119                         path_private.conf_data = conf_data;
1120                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1121                         if (dasd_eckd_identify_conf_parts(
1122                                     &path_private)) {
1123                                 path_private.conf_data = NULL;
1124                                 path_private.conf_len = 0;
1125                                 kfree(conf_data);
1126                                 continue;
1127                         }
1128                         if (dasd_eckd_compare_path_uid(
1129                                     device, &path_private)) {
1130                                 uid = &path_private.uid;
1131                                 if (strlen(uid->vduit) > 0)
1132                                         snprintf(print_path_uid,
1133                                                  sizeof(print_path_uid),
1134                                                  "%s.%s.%04x.%02x.%s",
1135                                                  uid->vendor, uid->serial,
1136                                                  uid->ssid, uid->real_unit_addr,
1137                                                  uid->vduit);
1138                                 else
1139                                         snprintf(print_path_uid,
1140                                                  sizeof(print_path_uid),
1141                                                  "%s.%s.%04x.%02x",
1142                                                  uid->vendor, uid->serial,
1143                                                  uid->ssid,
1144                                                  uid->real_unit_addr);
1145                                 uid = &private->uid;
1146                                 if (strlen(uid->vduit) > 0)
1147                                         snprintf(print_device_uid,
1148                                                  sizeof(print_device_uid),
1149                                                  "%s.%s.%04x.%02x.%s",
1150                                                  uid->vendor, uid->serial,
1151                                                  uid->ssid, uid->real_unit_addr,
1152                                                  uid->vduit);
1153                                 else
1154                                         snprintf(print_device_uid,
1155                                                  sizeof(print_device_uid),
1156                                                  "%s.%s.%04x.%02x",
1157                                                  uid->vendor, uid->serial,
1158                                                  uid->ssid,
1159                                                  uid->real_unit_addr);
1160                                 dev_err(&device->cdev->dev,
1161                                         "Not all channel paths lead to "
1162                                         "the same device, path %02X leads to "
1163                                         "device %s instead of %s\n", lpm,
1164                                         print_path_uid, print_device_uid);
1165                                 path_err = -EINVAL;
1166                                 dasd_path_add_cablepm(device, lpm);
1167                                 continue;
1168                         }
1169                         path_private.conf_data = NULL;
1170                         path_private.conf_len = 0;
1171                 }
1172
1173                 pos = pathmask_to_pos(lpm);
1174                 dasd_eckd_store_conf_data(device, conf_data, pos);
1175
1176                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1177                 case 0x02:
1178                         dasd_path_add_nppm(device, lpm);
1179                         break;
1180                 case 0x03:
1181                         dasd_path_add_ppm(device, lpm);
1182                         break;
1183                 }
1184                 if (!dasd_path_get_opm(device)) {
1185                         dasd_path_set_opm(device, lpm);
1186                         dasd_generic_path_operational(device);
1187                 } else {
1188                         dasd_path_add_opm(device, lpm);
1189                 }
1190         }
1191
1192         dasd_eckd_read_fc_security(device);
1193
1194         return path_err;
1195 }
1196
1197 static u32 get_fcx_max_data(struct dasd_device *device)
1198 {
1199         struct dasd_eckd_private *private = device->private;
1200         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1201         unsigned int mdc;
1202         int tpm;
1203
1204         if (dasd_nofcx)
1205                 return 0;
1206         /* is transport mode supported? */
1207         fcx_in_css = css_general_characteristics.fcx;
1208         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1209         fcx_in_features = private->features.feature[40] & 0x80;
1210         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1211
1212         if (!tpm)
1213                 return 0;
1214
1215         mdc = ccw_device_get_mdc(device->cdev, 0);
1216         if (mdc == 0) {
1217                 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1218                 return 0;
1219         } else {
1220                 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1221         }
1222 }
1223
1224 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1225 {
1226         struct dasd_eckd_private *private = device->private;
1227         unsigned int mdc;
1228         u32 fcx_max_data;
1229
1230         if (private->fcx_max_data) {
1231                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1232                 if (mdc == 0) {
1233                         dev_warn(&device->cdev->dev,
1234                                  "Detecting the maximum data size for zHPF "
1235                                  "requests failed (rc=%d) for a new path %x\n",
1236                                  mdc, lpm);
1237                         return mdc;
1238                 }
1239                 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1240                 if (fcx_max_data < private->fcx_max_data) {
1241                         dev_warn(&device->cdev->dev,
1242                                  "The maximum data size for zHPF requests %u "
1243                                  "on a new path %x is below the active maximum "
1244                                  "%u\n", fcx_max_data, lpm,
1245                                  private->fcx_max_data);
1246                         return -EACCES;
1247                 }
1248         }
1249         return 0;
1250 }
1251
1252 static int rebuild_device_uid(struct dasd_device *device,
1253                               struct pe_handler_work_data *data)
1254 {
1255         struct dasd_eckd_private *private = device->private;
1256         __u8 lpm, opm = dasd_path_get_opm(device);
1257         int rc = -ENODEV;
1258
1259         for (lpm = 0x80; lpm; lpm >>= 1) {
1260                 if (!(lpm & opm))
1261                         continue;
1262                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1263                 memset(&data->cqr, 0, sizeof(data->cqr));
1264                 data->cqr.cpaddr = &data->ccw;
1265                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1266                                                      data->rcd_buffer,
1267                                                      lpm);
1268
1269                 if (rc) {
1270                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1271                                 continue;
1272                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1273                                         "Read configuration data "
1274                                         "returned error %d", rc);
1275                         break;
1276                 }
1277                 memcpy(private->conf_data, data->rcd_buffer,
1278                        DASD_ECKD_RCD_DATA_SIZE);
1279                 if (dasd_eckd_identify_conf_parts(private)) {
1280                         rc = -ENODEV;
1281                 } else /* first valid path is enough */
1282                         break;
1283         }
1284
1285         if (!rc)
1286                 rc = dasd_eckd_generate_uid(device);
1287
1288         return rc;
1289 }
1290
1291 static void dasd_eckd_path_available_action(struct dasd_device *device,
1292                                             struct pe_handler_work_data *data)
1293 {
1294         struct dasd_eckd_private path_private;
1295         struct dasd_uid *uid;
1296         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1297         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1298         struct dasd_conf_data *conf_data;
1299         unsigned long flags;
1300         char print_uid[60];
1301         int rc, pos;
1302
1303         opm = 0;
1304         npm = 0;
1305         ppm = 0;
1306         epm = 0;
1307         hpfpm = 0;
1308         cablepm = 0;
1309
1310         for (lpm = 0x80; lpm; lpm >>= 1) {
1311                 if (!(lpm & data->tbvpm))
1312                         continue;
1313                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1314                 memset(&data->cqr, 0, sizeof(data->cqr));
1315                 data->cqr.cpaddr = &data->ccw;
1316                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1317                                                      data->rcd_buffer,
1318                                                      lpm);
1319                 if (!rc) {
1320                         switch (dasd_eckd_path_access(data->rcd_buffer,
1321                                                       DASD_ECKD_RCD_DATA_SIZE)
1322                                 ) {
1323                         case 0x02:
1324                                 npm |= lpm;
1325                                 break;
1326                         case 0x03:
1327                                 ppm |= lpm;
1328                                 break;
1329                         }
1330                         opm |= lpm;
1331                 } else if (rc == -EOPNOTSUPP) {
1332                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1333                                         "path verification: No configuration "
1334                                         "data retrieved");
1335                         opm |= lpm;
1336                 } else if (rc == -EAGAIN) {
1337                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1338                                         "path verification: device is stopped,"
1339                                         " try again later");
1340                         epm |= lpm;
1341                 } else {
1342                         dev_warn(&device->cdev->dev,
1343                                  "Reading device feature codes failed "
1344                                  "(rc=%d) for new path %x\n", rc, lpm);
1345                         continue;
1346                 }
1347                 if (verify_fcx_max_data(device, lpm)) {
1348                         opm &= ~lpm;
1349                         npm &= ~lpm;
1350                         ppm &= ~lpm;
1351                         hpfpm |= lpm;
1352                         continue;
1353                 }
1354
1355                 /*
1356                  * save conf_data for comparison after
1357                  * rebuild_device_uid may have changed
1358                  * the original data
1359                  */
1360                 memcpy(&path_rcd_buf, data->rcd_buffer,
1361                        DASD_ECKD_RCD_DATA_SIZE);
1362                 path_private.conf_data = (void *) &path_rcd_buf;
1363                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1364                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1365                         path_private.conf_data = NULL;
1366                         path_private.conf_len = 0;
1367                         continue;
1368                 }
1369
1370                 /*
1371                  * compare path UID with device UID only if at least
1372                  * one valid path is left
1373                  * in other case the device UID may have changed and
1374                  * the first working path UID will be used as device UID
1375                  */
1376                 if (dasd_path_get_opm(device) &&
1377                     dasd_eckd_compare_path_uid(device, &path_private)) {
1378                         /*
1379                          * the comparison was not successful
1380                          * rebuild the device UID with at least one
1381                          * known path in case a z/VM hyperswap command
1382                          * has changed the device
1383                          *
1384                          * after this compare again
1385                          *
1386                          * if either the rebuild or the recompare fails
1387                          * the path can not be used
1388                          */
1389                         if (rebuild_device_uid(device, data) ||
1390                             dasd_eckd_compare_path_uid(
1391                                     device, &path_private)) {
1392                                 uid = &path_private.uid;
1393                                 if (strlen(uid->vduit) > 0)
1394                                         snprintf(print_uid, sizeof(print_uid),
1395                                                  "%s.%s.%04x.%02x.%s",
1396                                                  uid->vendor, uid->serial,
1397                                                  uid->ssid, uid->real_unit_addr,
1398                                                  uid->vduit);
1399                                 else
1400                                         snprintf(print_uid, sizeof(print_uid),
1401                                                  "%s.%s.%04x.%02x",
1402                                                  uid->vendor, uid->serial,
1403                                                  uid->ssid,
1404                                                  uid->real_unit_addr);
1405                                 dev_err(&device->cdev->dev,
1406                                         "The newly added channel path %02X "
1407                                         "will not be used because it leads "
1408                                         "to a different device %s\n",
1409                                         lpm, print_uid);
1410                                 opm &= ~lpm;
1411                                 npm &= ~lpm;
1412                                 ppm &= ~lpm;
1413                                 cablepm |= lpm;
1414                                 continue;
1415                         }
1416                 }
1417
1418                 conf_data = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL);
1419                 if (conf_data) {
1420                         memcpy(conf_data, data->rcd_buffer,
1421                                DASD_ECKD_RCD_DATA_SIZE);
1422                 }
1423                 pos = pathmask_to_pos(lpm);
1424                 dasd_eckd_store_conf_data(device, conf_data, pos);
1425
1426                 /*
1427                  * There is a small chance that a path is lost again between
1428                  * above path verification and the following modification of
1429                  * the device opm mask. We could avoid that race here by using
1430                  * yet another path mask, but we rather deal with this unlikely
1431                  * situation in dasd_start_IO.
1432                  */
1433                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1434                 if (!dasd_path_get_opm(device) && opm) {
1435                         dasd_path_set_opm(device, opm);
1436                         dasd_generic_path_operational(device);
1437                 } else {
1438                         dasd_path_add_opm(device, opm);
1439                 }
1440                 dasd_path_add_nppm(device, npm);
1441                 dasd_path_add_ppm(device, ppm);
1442                 dasd_path_add_tbvpm(device, epm);
1443                 dasd_path_add_cablepm(device, cablepm);
1444                 dasd_path_add_nohpfpm(device, hpfpm);
1445                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1446
1447                 dasd_path_create_kobj(device, pos);
1448         }
1449 }
1450
1451 static void do_pe_handler_work(struct work_struct *work)
1452 {
1453         struct pe_handler_work_data *data;
1454         struct dasd_device *device;
1455
1456         data = container_of(work, struct pe_handler_work_data, worker);
1457         device = data->device;
1458
1459         /* delay path verification until device was resumed */
1460         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1461                 schedule_work(work);
1462                 return;
1463         }
1464         /* check if path verification already running and delay if so */
1465         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1466                 schedule_work(work);
1467                 return;
1468         }
1469
1470         if (data->tbvpm)
1471                 dasd_eckd_path_available_action(device, data);
1472         if (data->fcsecpm)
1473                 dasd_eckd_read_fc_security(device);
1474
1475         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1476         dasd_put_device(device);
1477         if (data->isglobal)
1478                 mutex_unlock(&dasd_pe_handler_mutex);
1479         else
1480                 kfree(data);
1481 }
1482
1483 static int dasd_eckd_pe_handler(struct dasd_device *device,
1484                                 __u8 tbvpm, __u8 fcsecpm)
1485 {
1486         struct pe_handler_work_data *data;
1487
1488         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1489         if (!data) {
1490                 if (mutex_trylock(&dasd_pe_handler_mutex)) {
1491                         data = pe_handler_worker;
1492                         data->isglobal = 1;
1493                 } else {
1494                         return -ENOMEM;
1495                 }
1496         } else {
1497                 memset(data, 0, sizeof(*data));
1498                 data->isglobal = 0;
1499         }
1500         INIT_WORK(&data->worker, do_pe_handler_work);
1501         dasd_get_device(device);
1502         data->device = device;
1503         data->tbvpm = tbvpm;
1504         data->fcsecpm = fcsecpm;
1505         schedule_work(&data->worker);
1506         return 0;
1507 }
1508
1509 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1510 {
1511         struct dasd_eckd_private *private = device->private;
1512         unsigned long flags;
1513
1514         if (!private->fcx_max_data)
1515                 private->fcx_max_data = get_fcx_max_data(device);
1516         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1517         dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1518         dasd_schedule_device_bh(device);
1519         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1520 }
1521
1522 static int dasd_eckd_read_features(struct dasd_device *device)
1523 {
1524         struct dasd_eckd_private *private = device->private;
1525         struct dasd_psf_prssd_data *prssdp;
1526         struct dasd_rssd_features *features;
1527         struct dasd_ccw_req *cqr;
1528         struct ccw1 *ccw;
1529         int rc;
1530
1531         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1532         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1533                                    (sizeof(struct dasd_psf_prssd_data) +
1534                                     sizeof(struct dasd_rssd_features)),
1535                                    device, NULL);
1536         if (IS_ERR(cqr)) {
1537                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1538                                 "allocate initialization request");
1539                 return PTR_ERR(cqr);
1540         }
1541         cqr->startdev = device;
1542         cqr->memdev = device;
1543         cqr->block = NULL;
1544         cqr->retries = 256;
1545         cqr->expires = 10 * HZ;
1546
1547         /* Prepare for Read Subsystem Data */
1548         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1549         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1550         prssdp->order = PSF_ORDER_PRSSD;
1551         prssdp->suborder = 0x41;        /* Read Feature Codes */
1552         /* all other bytes of prssdp must be zero */
1553
1554         ccw = cqr->cpaddr;
1555         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1556         ccw->count = sizeof(struct dasd_psf_prssd_data);
1557         ccw->flags |= CCW_FLAG_CC;
1558         ccw->cda = (__u32)(addr_t) prssdp;
1559
1560         /* Read Subsystem Data - feature codes */
1561         features = (struct dasd_rssd_features *) (prssdp + 1);
1562         memset(features, 0, sizeof(struct dasd_rssd_features));
1563
1564         ccw++;
1565         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1566         ccw->count = sizeof(struct dasd_rssd_features);
1567         ccw->cda = (__u32)(addr_t) features;
1568
1569         cqr->buildclk = get_tod_clock();
1570         cqr->status = DASD_CQR_FILLED;
1571         rc = dasd_sleep_on(cqr);
1572         if (rc == 0) {
1573                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1574                 features = (struct dasd_rssd_features *) (prssdp + 1);
1575                 memcpy(&private->features, features,
1576                        sizeof(struct dasd_rssd_features));
1577         } else
1578                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1579                          " failed with rc=%d\n", rc);
1580         dasd_sfree_request(cqr, cqr->memdev);
1581         return rc;
1582 }
1583
1584 /* Read Volume Information - Volume Storage Query */
1585 static int dasd_eckd_read_vol_info(struct dasd_device *device)
1586 {
1587         struct dasd_eckd_private *private = device->private;
1588         struct dasd_psf_prssd_data *prssdp;
1589         struct dasd_rssd_vsq *vsq;
1590         struct dasd_ccw_req *cqr;
1591         struct ccw1 *ccw;
1592         int useglobal;
1593         int rc;
1594
1595         /* This command cannot be executed on an alias device */
1596         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1597             private->uid.type == UA_HYPER_PAV_ALIAS)
1598                 return 0;
1599
1600         useglobal = 0;
1601         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1602                                    sizeof(*prssdp) + sizeof(*vsq), device, NULL);
1603         if (IS_ERR(cqr)) {
1604                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1605                                 "Could not allocate initialization request");
1606                 mutex_lock(&dasd_vol_info_mutex);
1607                 useglobal = 1;
1608                 cqr = &dasd_vol_info_req->cqr;
1609                 memset(cqr, 0, sizeof(*cqr));
1610                 memset(dasd_vol_info_req, 0, sizeof(*dasd_vol_info_req));
1611                 cqr->cpaddr = &dasd_vol_info_req->ccw;
1612                 cqr->data = &dasd_vol_info_req->data;
1613                 cqr->magic = DASD_ECKD_MAGIC;
1614         }
1615
1616         /* Prepare for Read Subsystem Data */
1617         prssdp = cqr->data;
1618         prssdp->order = PSF_ORDER_PRSSD;
1619         prssdp->suborder = PSF_SUBORDER_VSQ;    /* Volume Storage Query */
1620         prssdp->lss = private->ned->ID;
1621         prssdp->volume = private->ned->unit_addr;
1622
1623         ccw = cqr->cpaddr;
1624         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1625         ccw->count = sizeof(*prssdp);
1626         ccw->flags |= CCW_FLAG_CC;
1627         ccw->cda = (__u32)(addr_t)prssdp;
1628
1629         /* Read Subsystem Data - Volume Storage Query */
1630         vsq = (struct dasd_rssd_vsq *)(prssdp + 1);
1631         memset(vsq, 0, sizeof(*vsq));
1632
1633         ccw++;
1634         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1635         ccw->count = sizeof(*vsq);
1636         ccw->flags |= CCW_FLAG_SLI;
1637         ccw->cda = (__u32)(addr_t)vsq;
1638
1639         cqr->buildclk = get_tod_clock();
1640         cqr->status = DASD_CQR_FILLED;
1641         cqr->startdev = device;
1642         cqr->memdev = device;
1643         cqr->block = NULL;
1644         cqr->retries = 256;
1645         cqr->expires = device->default_expires * HZ;
1646         /* The command might not be supported. Suppress the error output */
1647         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1648
1649         rc = dasd_sleep_on_interruptible(cqr);
1650         if (rc == 0) {
1651                 memcpy(&private->vsq, vsq, sizeof(*vsq));
1652         } else {
1653                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1654                                 "Reading the volume storage information failed with rc=%d", rc);
1655         }
1656
1657         if (useglobal)
1658                 mutex_unlock(&dasd_vol_info_mutex);
1659         else
1660                 dasd_sfree_request(cqr, cqr->memdev);
1661
1662         return rc;
1663 }
1664
1665 static int dasd_eckd_is_ese(struct dasd_device *device)
1666 {
1667         struct dasd_eckd_private *private = device->private;
1668
1669         return private->vsq.vol_info.ese;
1670 }
1671
1672 static int dasd_eckd_ext_pool_id(struct dasd_device *device)
1673 {
1674         struct dasd_eckd_private *private = device->private;
1675
1676         return private->vsq.extent_pool_id;
1677 }
1678
1679 /*
1680  * This value represents the total amount of available space. As more space is
1681  * allocated by ESE volumes, this value will decrease.
1682  * The data for this value is therefore updated on any call.
1683  */
1684 static int dasd_eckd_space_configured(struct dasd_device *device)
1685 {
1686         struct dasd_eckd_private *private = device->private;
1687         int rc;
1688
1689         rc = dasd_eckd_read_vol_info(device);
1690
1691         return rc ? : private->vsq.space_configured;
1692 }
1693
1694 /*
1695  * The value of space allocated by an ESE volume may have changed and is
1696  * therefore updated on any call.
1697  */
1698 static int dasd_eckd_space_allocated(struct dasd_device *device)
1699 {
1700         struct dasd_eckd_private *private = device->private;
1701         int rc;
1702
1703         rc = dasd_eckd_read_vol_info(device);
1704
1705         return rc ? : private->vsq.space_allocated;
1706 }
1707
1708 static int dasd_eckd_logical_capacity(struct dasd_device *device)
1709 {
1710         struct dasd_eckd_private *private = device->private;
1711
1712         return private->vsq.logical_capacity;
1713 }
1714
1715 static void dasd_eckd_ext_pool_exhaust_work(struct work_struct *work)
1716 {
1717         struct ext_pool_exhaust_work_data *data;
1718         struct dasd_device *device;
1719         struct dasd_device *base;
1720
1721         data = container_of(work, struct ext_pool_exhaust_work_data, worker);
1722         device = data->device;
1723         base = data->base;
1724
1725         if (!base)
1726                 base = device;
1727         if (dasd_eckd_space_configured(base) != 0) {
1728                 dasd_generic_space_avail(device);
1729         } else {
1730                 dev_warn(&device->cdev->dev, "No space left in the extent pool\n");
1731                 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "out of space");
1732         }
1733
1734         dasd_put_device(device);
1735         kfree(data);
1736 }
1737
1738 static int dasd_eckd_ext_pool_exhaust(struct dasd_device *device,
1739                                       struct dasd_ccw_req *cqr)
1740 {
1741         struct ext_pool_exhaust_work_data *data;
1742
1743         data = kzalloc(sizeof(*data), GFP_ATOMIC);
1744         if (!data)
1745                 return -ENOMEM;
1746         INIT_WORK(&data->worker, dasd_eckd_ext_pool_exhaust_work);
1747         dasd_get_device(device);
1748         data->device = device;
1749
1750         if (cqr->block)
1751                 data->base = cqr->block->base;
1752         else if (cqr->basedev)
1753                 data->base = cqr->basedev;
1754         else
1755                 data->base = NULL;
1756
1757         schedule_work(&data->worker);
1758
1759         return 0;
1760 }
1761
1762 static void dasd_eckd_cpy_ext_pool_data(struct dasd_device *device,
1763                                         struct dasd_rssd_lcq *lcq)
1764 {
1765         struct dasd_eckd_private *private = device->private;
1766         int pool_id = dasd_eckd_ext_pool_id(device);
1767         struct dasd_ext_pool_sum eps;
1768         int i;
1769
1770         for (i = 0; i < lcq->pool_count; i++) {
1771                 eps = lcq->ext_pool_sum[i];
1772                 if (eps.pool_id == pool_id) {
1773                         memcpy(&private->eps, &eps,
1774                                sizeof(struct dasd_ext_pool_sum));
1775                 }
1776         }
1777 }
1778
1779 /* Read Extent Pool Information - Logical Configuration Query */
1780 static int dasd_eckd_read_ext_pool_info(struct dasd_device *device)
1781 {
1782         struct dasd_eckd_private *private = device->private;
1783         struct dasd_psf_prssd_data *prssdp;
1784         struct dasd_rssd_lcq *lcq;
1785         struct dasd_ccw_req *cqr;
1786         struct ccw1 *ccw;
1787         int rc;
1788
1789         /* This command cannot be executed on an alias device */
1790         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1791             private->uid.type == UA_HYPER_PAV_ALIAS)
1792                 return 0;
1793
1794         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1795                                    sizeof(*prssdp) + sizeof(*lcq), device, NULL);
1796         if (IS_ERR(cqr)) {
1797                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1798                                 "Could not allocate initialization request");
1799                 return PTR_ERR(cqr);
1800         }
1801
1802         /* Prepare for Read Subsystem Data */
1803         prssdp = cqr->data;
1804         memset(prssdp, 0, sizeof(*prssdp));
1805         prssdp->order = PSF_ORDER_PRSSD;
1806         prssdp->suborder = PSF_SUBORDER_LCQ;    /* Logical Configuration Query */
1807
1808         ccw = cqr->cpaddr;
1809         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1810         ccw->count = sizeof(*prssdp);
1811         ccw->flags |= CCW_FLAG_CC;
1812         ccw->cda = (__u32)(addr_t)prssdp;
1813
1814         lcq = (struct dasd_rssd_lcq *)(prssdp + 1);
1815         memset(lcq, 0, sizeof(*lcq));
1816
1817         ccw++;
1818         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1819         ccw->count = sizeof(*lcq);
1820         ccw->flags |= CCW_FLAG_SLI;
1821         ccw->cda = (__u32)(addr_t)lcq;
1822
1823         cqr->buildclk = get_tod_clock();
1824         cqr->status = DASD_CQR_FILLED;
1825         cqr->startdev = device;
1826         cqr->memdev = device;
1827         cqr->block = NULL;
1828         cqr->retries = 256;
1829         cqr->expires = device->default_expires * HZ;
1830         /* The command might not be supported. Suppress the error output */
1831         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1832
1833         rc = dasd_sleep_on_interruptible(cqr);
1834         if (rc == 0) {
1835                 dasd_eckd_cpy_ext_pool_data(device, lcq);
1836         } else {
1837                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1838                                 "Reading the logical configuration failed with rc=%d", rc);
1839         }
1840
1841         dasd_sfree_request(cqr, cqr->memdev);
1842
1843         return rc;
1844 }
1845
1846 /*
1847  * Depending on the device type, the extent size is specified either as
1848  * cylinders per extent (CKD) or size per extent (FBA)
1849  * A 1GB size corresponds to 1113cyl, and 16MB to 21cyl.
1850  */
1851 static int dasd_eckd_ext_size(struct dasd_device *device)
1852 {
1853         struct dasd_eckd_private *private = device->private;
1854         struct dasd_ext_pool_sum eps = private->eps;
1855
1856         if (!eps.flags.extent_size_valid)
1857                 return 0;
1858         if (eps.extent_size.size_1G)
1859                 return 1113;
1860         if (eps.extent_size.size_16M)
1861                 return 21;
1862
1863         return 0;
1864 }
1865
1866 static int dasd_eckd_ext_pool_warn_thrshld(struct dasd_device *device)
1867 {
1868         struct dasd_eckd_private *private = device->private;
1869
1870         return private->eps.warn_thrshld;
1871 }
1872
1873 static int dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device *device)
1874 {
1875         struct dasd_eckd_private *private = device->private;
1876
1877         return private->eps.flags.capacity_at_warnlevel;
1878 }
1879
1880 /*
1881  * Extent Pool out of space
1882  */
1883 static int dasd_eckd_ext_pool_oos(struct dasd_device *device)
1884 {
1885         struct dasd_eckd_private *private = device->private;
1886
1887         return private->eps.flags.pool_oos;
1888 }
1889
1890 /*
1891  * Build CP for Perform Subsystem Function - SSC.
1892  */
1893 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1894                                                     int enable_pav)
1895 {
1896         struct dasd_ccw_req *cqr;
1897         struct dasd_psf_ssc_data *psf_ssc_data;
1898         struct ccw1 *ccw;
1899
1900         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1901                                   sizeof(struct dasd_psf_ssc_data),
1902                                    device, NULL);
1903
1904         if (IS_ERR(cqr)) {
1905                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1906                            "Could not allocate PSF-SSC request");
1907                 return cqr;
1908         }
1909         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1910         psf_ssc_data->order = PSF_ORDER_SSC;
1911         psf_ssc_data->suborder = 0xc0;
1912         if (enable_pav) {
1913                 psf_ssc_data->suborder |= 0x08;
1914                 psf_ssc_data->reserved[0] = 0x88;
1915         }
1916         ccw = cqr->cpaddr;
1917         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1918         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1919         ccw->count = 66;
1920
1921         cqr->startdev = device;
1922         cqr->memdev = device;
1923         cqr->block = NULL;
1924         cqr->retries = 256;
1925         cqr->expires = 10*HZ;
1926         cqr->buildclk = get_tod_clock();
1927         cqr->status = DASD_CQR_FILLED;
1928         return cqr;
1929 }
1930
1931 /*
1932  * Perform Subsystem Function.
1933  * It is necessary to trigger CIO for channel revalidation since this
1934  * call might change behaviour of DASD devices.
1935  */
1936 static int
1937 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1938                   unsigned long flags)
1939 {
1940         struct dasd_ccw_req *cqr;
1941         int rc;
1942
1943         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1944         if (IS_ERR(cqr))
1945                 return PTR_ERR(cqr);
1946
1947         /*
1948          * set flags e.g. turn on failfast, to prevent blocking
1949          * the calling function should handle failed requests
1950          */
1951         cqr->flags |= flags;
1952
1953         rc = dasd_sleep_on(cqr);
1954         if (!rc)
1955                 /* trigger CIO to reprobe devices */
1956                 css_schedule_reprobe();
1957         else if (cqr->intrc == -EAGAIN)
1958                 rc = -EAGAIN;
1959
1960         dasd_sfree_request(cqr, cqr->memdev);
1961         return rc;
1962 }
1963
1964 /*
1965  * Valide storage server of current device.
1966  */
1967 static int dasd_eckd_validate_server(struct dasd_device *device,
1968                                      unsigned long flags)
1969 {
1970         struct dasd_eckd_private *private = device->private;
1971         int enable_pav, rc;
1972
1973         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1974             private->uid.type == UA_HYPER_PAV_ALIAS)
1975                 return 0;
1976         if (dasd_nopav || MACHINE_IS_VM)
1977                 enable_pav = 0;
1978         else
1979                 enable_pav = 1;
1980         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1981
1982         /* may be requested feature is not available on server,
1983          * therefore just report error and go ahead */
1984         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1985                         "returned rc=%d", private->uid.ssid, rc);
1986         return rc;
1987 }
1988
1989 /*
1990  * worker to do a validate server in case of a lost pathgroup
1991  */
1992 static void dasd_eckd_do_validate_server(struct work_struct *work)
1993 {
1994         struct dasd_device *device = container_of(work, struct dasd_device,
1995                                                   kick_validate);
1996         unsigned long flags = 0;
1997
1998         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1999         if (dasd_eckd_validate_server(device, flags)
2000             == -EAGAIN) {
2001                 /* schedule worker again if failed */
2002                 schedule_work(&device->kick_validate);
2003                 return;
2004         }
2005
2006         dasd_put_device(device);
2007 }
2008
2009 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
2010 {
2011         dasd_get_device(device);
2012         /* exit if device not online or in offline processing */
2013         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
2014            device->state < DASD_STATE_ONLINE) {
2015                 dasd_put_device(device);
2016                 return;
2017         }
2018         /* queue call to do_validate_server to the kernel event daemon. */
2019         if (!schedule_work(&device->kick_validate))
2020                 dasd_put_device(device);
2021 }
2022
2023 /*
2024  * Check device characteristics.
2025  * If the device is accessible using ECKD discipline, the device is enabled.
2026  */
2027 static int
2028 dasd_eckd_check_characteristics(struct dasd_device *device)
2029 {
2030         struct dasd_eckd_private *private = device->private;
2031         struct dasd_block *block;
2032         struct dasd_uid temp_uid;
2033         int rc, i;
2034         int readonly;
2035         unsigned long value;
2036
2037         /* setup work queue for validate server*/
2038         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
2039         /* setup work queue for summary unit check */
2040         INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
2041
2042         if (!ccw_device_is_pathgroup(device->cdev)) {
2043                 dev_warn(&device->cdev->dev,
2044                          "A channel path group could not be established\n");
2045                 return -EIO;
2046         }
2047         if (!ccw_device_is_multipath(device->cdev)) {
2048                 dev_info(&device->cdev->dev,
2049                          "The DASD is not operating in multipath mode\n");
2050         }
2051         if (!private) {
2052                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
2053                 if (!private) {
2054                         dev_warn(&device->cdev->dev,
2055                                  "Allocating memory for private DASD data "
2056                                  "failed\n");
2057                         return -ENOMEM;
2058                 }
2059                 device->private = private;
2060         } else {
2061                 memset(private, 0, sizeof(*private));
2062         }
2063         /* Invalidate status of initial analysis. */
2064         private->init_cqr_status = -1;
2065         /* Set default cache operations. */
2066         private->attrib.operation = DASD_NORMAL_CACHE;
2067         private->attrib.nr_cyl = 0;
2068
2069         /* Read Configuration Data */
2070         rc = dasd_eckd_read_conf(device);
2071         if (rc)
2072                 goto out_err1;
2073
2074         /* set some default values */
2075         device->default_expires = DASD_EXPIRES;
2076         device->default_retries = DASD_RETRIES;
2077         device->path_thrhld = DASD_ECKD_PATH_THRHLD;
2078         device->path_interval = DASD_ECKD_PATH_INTERVAL;
2079
2080         if (private->gneq) {
2081                 value = 1;
2082                 for (i = 0; i < private->gneq->timeout.value; i++)
2083                         value = 10 * value;
2084                 value = value * private->gneq->timeout.number;
2085                 /* do not accept useless values */
2086                 if (value != 0 && value <= DASD_EXPIRES_MAX)
2087                         device->default_expires = value;
2088         }
2089
2090         dasd_eckd_get_uid(device, &temp_uid);
2091         if (temp_uid.type == UA_BASE_DEVICE) {
2092                 block = dasd_alloc_block();
2093                 if (IS_ERR(block)) {
2094                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
2095                                         "could not allocate dasd "
2096                                         "block structure");
2097                         rc = PTR_ERR(block);
2098                         goto out_err1;
2099                 }
2100                 device->block = block;
2101                 block->base = device;
2102         }
2103
2104         /* register lcu with alias handling, enable PAV */
2105         rc = dasd_alias_make_device_known_to_lcu(device);
2106         if (rc)
2107                 goto out_err2;
2108
2109         dasd_eckd_validate_server(device, 0);
2110
2111         /* device may report different configuration data after LCU setup */
2112         rc = dasd_eckd_read_conf(device);
2113         if (rc)
2114                 goto out_err3;
2115
2116         dasd_path_create_kobjects(device);
2117
2118         /* Read Feature Codes */
2119         dasd_eckd_read_features(device);
2120
2121         /* Read Volume Information */
2122         dasd_eckd_read_vol_info(device);
2123
2124         /* Read Extent Pool Information */
2125         dasd_eckd_read_ext_pool_info(device);
2126
2127         /* Read Device Characteristics */
2128         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
2129                                          &private->rdc_data, 64);
2130         if (rc) {
2131                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2132                                 "Read device characteristic failed, rc=%d", rc);
2133                 goto out_err3;
2134         }
2135
2136         if ((device->features & DASD_FEATURE_USERAW) &&
2137             !(private->rdc_data.facilities.RT_in_LR)) {
2138                 dev_err(&device->cdev->dev, "The storage server does not "
2139                         "support raw-track access\n");
2140                 rc = -EINVAL;
2141                 goto out_err3;
2142         }
2143
2144         /* find the valid cylinder size */
2145         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
2146             private->rdc_data.long_no_cyl)
2147                 private->real_cyl = private->rdc_data.long_no_cyl;
2148         else
2149                 private->real_cyl = private->rdc_data.no_cyl;
2150
2151         private->fcx_max_data = get_fcx_max_data(device);
2152
2153         readonly = dasd_device_is_ro(device);
2154         if (readonly)
2155                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
2156
2157         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
2158                  "with %d cylinders, %d heads, %d sectors%s\n",
2159                  private->rdc_data.dev_type,
2160                  private->rdc_data.dev_model,
2161                  private->rdc_data.cu_type,
2162                  private->rdc_data.cu_model.model,
2163                  private->real_cyl,
2164                  private->rdc_data.trk_per_cyl,
2165                  private->rdc_data.sec_per_trk,
2166                  readonly ? ", read-only device" : "");
2167         return 0;
2168
2169 out_err3:
2170         dasd_alias_disconnect_device_from_lcu(device);
2171 out_err2:
2172         dasd_free_block(device->block);
2173         device->block = NULL;
2174 out_err1:
2175         dasd_eckd_clear_conf_data(device);
2176         kfree(device->private);
2177         device->private = NULL;
2178         return rc;
2179 }
2180
2181 static void dasd_eckd_uncheck_device(struct dasd_device *device)
2182 {
2183         struct dasd_eckd_private *private = device->private;
2184
2185         if (!private)
2186                 return;
2187
2188         dasd_alias_disconnect_device_from_lcu(device);
2189         private->ned = NULL;
2190         private->sneq = NULL;
2191         private->vdsneq = NULL;
2192         private->gneq = NULL;
2193         dasd_eckd_clear_conf_data(device);
2194 }
2195
2196 static struct dasd_ccw_req *
2197 dasd_eckd_analysis_ccw(struct dasd_device *device)
2198 {
2199         struct dasd_eckd_private *private = device->private;
2200         struct eckd_count *count_data;
2201         struct LO_eckd_data *LO_data;
2202         struct dasd_ccw_req *cqr;
2203         struct ccw1 *ccw;
2204         int cplength, datasize;
2205         int i;
2206
2207         cplength = 8;
2208         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
2209         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
2210                                    NULL);
2211         if (IS_ERR(cqr))
2212                 return cqr;
2213         ccw = cqr->cpaddr;
2214         /* Define extent for the first 2 tracks. */
2215         define_extent(ccw++, cqr->data, 0, 1,
2216                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2217         LO_data = cqr->data + sizeof(struct DE_eckd_data);
2218         /* Locate record for the first 4 records on track 0. */
2219         ccw[-1].flags |= CCW_FLAG_CC;
2220         locate_record(ccw++, LO_data++, 0, 0, 4,
2221                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2222
2223         count_data = private->count_area;
2224         for (i = 0; i < 4; i++) {
2225                 ccw[-1].flags |= CCW_FLAG_CC;
2226                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2227                 ccw->flags = 0;
2228                 ccw->count = 8;
2229                 ccw->cda = (__u32)(addr_t) count_data;
2230                 ccw++;
2231                 count_data++;
2232         }
2233
2234         /* Locate record for the first record on track 1. */
2235         ccw[-1].flags |= CCW_FLAG_CC;
2236         locate_record(ccw++, LO_data++, 1, 0, 1,
2237                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2238         /* Read count ccw. */
2239         ccw[-1].flags |= CCW_FLAG_CC;
2240         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2241         ccw->flags = 0;
2242         ccw->count = 8;
2243         ccw->cda = (__u32)(addr_t) count_data;
2244
2245         cqr->block = NULL;
2246         cqr->startdev = device;
2247         cqr->memdev = device;
2248         cqr->retries = 255;
2249         cqr->buildclk = get_tod_clock();
2250         cqr->status = DASD_CQR_FILLED;
2251         /* Set flags to suppress output for expected errors */
2252         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2253
2254         return cqr;
2255 }
2256
2257 /* differentiate between 'no record found' and any other error */
2258 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
2259 {
2260         char *sense;
2261         if (init_cqr->status == DASD_CQR_DONE)
2262                 return INIT_CQR_OK;
2263         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
2264                  init_cqr->status == DASD_CQR_FAILED) {
2265                 sense = dasd_get_sense(&init_cqr->irb);
2266                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
2267                         return INIT_CQR_UNFORMATTED;
2268                 else
2269                         return INIT_CQR_ERROR;
2270         } else
2271                 return INIT_CQR_ERROR;
2272 }
2273
2274 /*
2275  * This is the callback function for the init_analysis cqr. It saves
2276  * the status of the initial analysis ccw before it frees it and kicks
2277  * the device to continue the startup sequence. This will call
2278  * dasd_eckd_do_analysis again (if the devices has not been marked
2279  * for deletion in the meantime).
2280  */
2281 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
2282                                         void *data)
2283 {
2284         struct dasd_device *device = init_cqr->startdev;
2285         struct dasd_eckd_private *private = device->private;
2286
2287         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
2288         dasd_sfree_request(init_cqr, device);
2289         dasd_kick_device(device);
2290 }
2291
2292 static int dasd_eckd_start_analysis(struct dasd_block *block)
2293 {
2294         struct dasd_ccw_req *init_cqr;
2295
2296         init_cqr = dasd_eckd_analysis_ccw(block->base);
2297         if (IS_ERR(init_cqr))
2298                 return PTR_ERR(init_cqr);
2299         init_cqr->callback = dasd_eckd_analysis_callback;
2300         init_cqr->callback_data = NULL;
2301         init_cqr->expires = 5*HZ;
2302         /* first try without ERP, so we can later handle unformatted
2303          * devices as special case
2304          */
2305         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
2306         init_cqr->retries = 0;
2307         dasd_add_request_head(init_cqr);
2308         return -EAGAIN;
2309 }
2310
2311 static int dasd_eckd_end_analysis(struct dasd_block *block)
2312 {
2313         struct dasd_device *device = block->base;
2314         struct dasd_eckd_private *private = device->private;
2315         struct eckd_count *count_area;
2316         unsigned int sb, blk_per_trk;
2317         int status, i;
2318         struct dasd_ccw_req *init_cqr;
2319
2320         status = private->init_cqr_status;
2321         private->init_cqr_status = -1;
2322         if (status == INIT_CQR_ERROR) {
2323                 /* try again, this time with full ERP */
2324                 init_cqr = dasd_eckd_analysis_ccw(device);
2325                 dasd_sleep_on(init_cqr);
2326                 status = dasd_eckd_analysis_evaluation(init_cqr);
2327                 dasd_sfree_request(init_cqr, device);
2328         }
2329
2330         if (device->features & DASD_FEATURE_USERAW) {
2331                 block->bp_block = DASD_RAW_BLOCKSIZE;
2332                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
2333                 block->s2b_shift = 3;
2334                 goto raw;
2335         }
2336
2337         if (status == INIT_CQR_UNFORMATTED) {
2338                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2339                 return -EMEDIUMTYPE;
2340         } else if (status == INIT_CQR_ERROR) {
2341                 dev_err(&device->cdev->dev,
2342                         "Detecting the DASD disk layout failed because "
2343                         "of an I/O error\n");
2344                 return -EIO;
2345         }
2346
2347         private->uses_cdl = 1;
2348         /* Check Track 0 for Compatible Disk Layout */
2349         count_area = NULL;
2350         for (i = 0; i < 3; i++) {
2351                 if (private->count_area[i].kl != 4 ||
2352                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2353                     private->count_area[i].cyl != 0 ||
2354                     private->count_area[i].head != count_area_head[i] ||
2355                     private->count_area[i].record != count_area_rec[i]) {
2356                         private->uses_cdl = 0;
2357                         break;
2358                 }
2359         }
2360         if (i == 3)
2361                 count_area = &private->count_area[3];
2362
2363         if (private->uses_cdl == 0) {
2364                 for (i = 0; i < 5; i++) {
2365                         if ((private->count_area[i].kl != 0) ||
2366                             (private->count_area[i].dl !=
2367                              private->count_area[0].dl) ||
2368                             private->count_area[i].cyl !=  0 ||
2369                             private->count_area[i].head != count_area_head[i] ||
2370                             private->count_area[i].record != count_area_rec[i])
2371                                 break;
2372                 }
2373                 if (i == 5)
2374                         count_area = &private->count_area[0];
2375         } else {
2376                 if (private->count_area[3].record == 1)
2377                         dev_warn(&device->cdev->dev,
2378                                  "Track 0 has no records following the VTOC\n");
2379         }
2380
2381         if (count_area != NULL && count_area->kl == 0) {
2382                 /* we found notthing violating our disk layout */
2383                 if (dasd_check_blocksize(count_area->dl) == 0)
2384                         block->bp_block = count_area->dl;
2385         }
2386         if (block->bp_block == 0) {
2387                 dev_warn(&device->cdev->dev,
2388                          "The disk layout of the DASD is not supported\n");
2389                 return -EMEDIUMTYPE;
2390         }
2391         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2392         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2393                 block->s2b_shift++;
2394
2395         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2396
2397 raw:
2398         block->blocks = ((unsigned long) private->real_cyl *
2399                           private->rdc_data.trk_per_cyl *
2400                           blk_per_trk);
2401
2402         dev_info(&device->cdev->dev,
2403                  "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2404                  "%s\n", (block->bp_block >> 10),
2405                  (((unsigned long) private->real_cyl *
2406                    private->rdc_data.trk_per_cyl *
2407                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2408                  ((blk_per_trk * block->bp_block) >> 10),
2409                  private->uses_cdl ?
2410                  "compatible disk layout" : "linux disk layout");
2411
2412         return 0;
2413 }
2414
2415 static int dasd_eckd_do_analysis(struct dasd_block *block)
2416 {
2417         struct dasd_eckd_private *private = block->base->private;
2418
2419         if (private->init_cqr_status < 0)
2420                 return dasd_eckd_start_analysis(block);
2421         else
2422                 return dasd_eckd_end_analysis(block);
2423 }
2424
2425 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2426 {
2427         return dasd_alias_add_device(device);
2428 };
2429
2430 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2431 {
2432         if (cancel_work_sync(&device->reload_device))
2433                 dasd_put_device(device);
2434         if (cancel_work_sync(&device->kick_validate))
2435                 dasd_put_device(device);
2436
2437         return 0;
2438 };
2439
2440 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2441 {
2442         return dasd_alias_remove_device(device);
2443 };
2444
2445 static int
2446 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2447 {
2448         struct dasd_eckd_private *private = block->base->private;
2449
2450         if (dasd_check_blocksize(block->bp_block) == 0) {
2451                 geo->sectors = recs_per_track(&private->rdc_data,
2452                                               0, block->bp_block);
2453         }
2454         geo->cylinders = private->rdc_data.no_cyl;
2455         geo->heads = private->rdc_data.trk_per_cyl;
2456         return 0;
2457 }
2458
2459 /*
2460  * Build the TCW request for the format check
2461  */
2462 static struct dasd_ccw_req *
2463 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2464                           int enable_pav, struct eckd_count *fmt_buffer,
2465                           int rpt)
2466 {
2467         struct dasd_eckd_private *start_priv;
2468         struct dasd_device *startdev = NULL;
2469         struct tidaw *last_tidaw = NULL;
2470         struct dasd_ccw_req *cqr;
2471         struct itcw *itcw;
2472         int itcw_size;
2473         int count;
2474         int rc;
2475         int i;
2476
2477         if (enable_pav)
2478                 startdev = dasd_alias_get_start_dev(base);
2479
2480         if (!startdev)
2481                 startdev = base;
2482
2483         start_priv = startdev->private;
2484
2485         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2486
2487         /*
2488          * we're adding 'count' amount of tidaw to the itcw.
2489          * calculate the corresponding itcw_size
2490          */
2491         itcw_size = itcw_calc_size(0, count, 0);
2492
2493         cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2494         if (IS_ERR(cqr))
2495                 return cqr;
2496
2497         start_priv->count++;
2498
2499         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2500         if (IS_ERR(itcw)) {
2501                 rc = -EINVAL;
2502                 goto out_err;
2503         }
2504
2505         cqr->cpaddr = itcw_get_tcw(itcw);
2506         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2507                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2508                           sizeof(struct eckd_count),
2509                           count * sizeof(struct eckd_count), 0, rpt);
2510         if (rc)
2511                 goto out_err;
2512
2513         for (i = 0; i < count; i++) {
2514                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2515                                             sizeof(struct eckd_count));
2516                 if (IS_ERR(last_tidaw)) {
2517                         rc = -EINVAL;
2518                         goto out_err;
2519                 }
2520         }
2521
2522         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2523         itcw_finalize(itcw);
2524
2525         cqr->cpmode = 1;
2526         cqr->startdev = startdev;
2527         cqr->memdev = startdev;
2528         cqr->basedev = base;
2529         cqr->retries = startdev->default_retries;
2530         cqr->expires = startdev->default_expires * HZ;
2531         cqr->buildclk = get_tod_clock();
2532         cqr->status = DASD_CQR_FILLED;
2533         /* Set flags to suppress output for expected errors */
2534         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2535         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2536
2537         return cqr;
2538
2539 out_err:
2540         dasd_sfree_request(cqr, startdev);
2541
2542         return ERR_PTR(rc);
2543 }
2544
2545 /*
2546  * Build the CCW request for the format check
2547  */
2548 static struct dasd_ccw_req *
2549 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2550                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2551 {
2552         struct dasd_eckd_private *start_priv;
2553         struct dasd_eckd_private *base_priv;
2554         struct dasd_device *startdev = NULL;
2555         struct dasd_ccw_req *cqr;
2556         struct ccw1 *ccw;
2557         void *data;
2558         int cplength, datasize;
2559         int use_prefix;
2560         int count;
2561         int i;
2562
2563         if (enable_pav)
2564                 startdev = dasd_alias_get_start_dev(base);
2565
2566         if (!startdev)
2567                 startdev = base;
2568
2569         start_priv = startdev->private;
2570         base_priv = base->private;
2571
2572         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2573
2574         use_prefix = base_priv->features.feature[8] & 0x01;
2575
2576         if (use_prefix) {
2577                 cplength = 1;
2578                 datasize = sizeof(struct PFX_eckd_data);
2579         } else {
2580                 cplength = 2;
2581                 datasize = sizeof(struct DE_eckd_data) +
2582                         sizeof(struct LO_eckd_data);
2583         }
2584         cplength += count;
2585
2586         cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2587         if (IS_ERR(cqr))
2588                 return cqr;
2589
2590         start_priv->count++;
2591         data = cqr->data;
2592         ccw = cqr->cpaddr;
2593
2594         if (use_prefix) {
2595                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2596                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2597                            count, 0, 0);
2598         } else {
2599                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2600                               DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2601
2602                 data += sizeof(struct DE_eckd_data);
2603                 ccw[-1].flags |= CCW_FLAG_CC;
2604
2605                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2606                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2607         }
2608
2609         for (i = 0; i < count; i++) {
2610                 ccw[-1].flags |= CCW_FLAG_CC;
2611                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2612                 ccw->flags = CCW_FLAG_SLI;
2613                 ccw->count = 8;
2614                 ccw->cda = (__u32)(addr_t) fmt_buffer;
2615                 ccw++;
2616                 fmt_buffer++;
2617         }
2618
2619         cqr->startdev = startdev;
2620         cqr->memdev = startdev;
2621         cqr->basedev = base;
2622         cqr->retries = DASD_RETRIES;
2623         cqr->expires = startdev->default_expires * HZ;
2624         cqr->buildclk = get_tod_clock();
2625         cqr->status = DASD_CQR_FILLED;
2626         /* Set flags to suppress output for expected errors */
2627         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2628
2629         return cqr;
2630 }
2631
2632 static struct dasd_ccw_req *
2633 dasd_eckd_build_format(struct dasd_device *base, struct dasd_device *startdev,
2634                        struct format_data_t *fdata, int enable_pav)
2635 {
2636         struct dasd_eckd_private *base_priv;
2637         struct dasd_eckd_private *start_priv;
2638         struct dasd_ccw_req *fcp;
2639         struct eckd_count *ect;
2640         struct ch_t address;
2641         struct ccw1 *ccw;
2642         void *data;
2643         int rpt;
2644         int cplength, datasize;
2645         int i, j;
2646         int intensity = 0;
2647         int r0_perm;
2648         int nr_tracks;
2649         int use_prefix;
2650
2651         if (enable_pav)
2652                 startdev = dasd_alias_get_start_dev(base);
2653
2654         if (!startdev)
2655                 startdev = base;
2656
2657         start_priv = startdev->private;
2658         base_priv = base->private;
2659
2660         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2661
2662         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2663
2664         /*
2665          * fdata->intensity is a bit string that tells us what to do:
2666          *   Bit 0: write record zero
2667          *   Bit 1: write home address, currently not supported
2668          *   Bit 2: invalidate tracks
2669          *   Bit 3: use OS/390 compatible disk layout (cdl)
2670          *   Bit 4: do not allow storage subsystem to modify record zero
2671          * Only some bit combinations do make sense.
2672          */
2673         if (fdata->intensity & 0x10) {
2674                 r0_perm = 0;
2675                 intensity = fdata->intensity & ~0x10;
2676         } else {
2677                 r0_perm = 1;
2678                 intensity = fdata->intensity;
2679         }
2680
2681         use_prefix = base_priv->features.feature[8] & 0x01;
2682
2683         switch (intensity) {
2684         case 0x00:      /* Normal format */
2685         case 0x08:      /* Normal format, use cdl. */
2686                 cplength = 2 + (rpt*nr_tracks);
2687                 if (use_prefix)
2688                         datasize = sizeof(struct PFX_eckd_data) +
2689                                 sizeof(struct LO_eckd_data) +
2690                                 rpt * nr_tracks * sizeof(struct eckd_count);
2691                 else
2692                         datasize = sizeof(struct DE_eckd_data) +
2693                                 sizeof(struct LO_eckd_data) +
2694                                 rpt * nr_tracks * sizeof(struct eckd_count);
2695                 break;
2696         case 0x01:      /* Write record zero and format track. */
2697         case 0x09:      /* Write record zero and format track, use cdl. */
2698                 cplength = 2 + rpt * nr_tracks;
2699                 if (use_prefix)
2700                         datasize = sizeof(struct PFX_eckd_data) +
2701                                 sizeof(struct LO_eckd_data) +
2702                                 sizeof(struct eckd_count) +
2703                                 rpt * nr_tracks * sizeof(struct eckd_count);
2704                 else
2705                         datasize = sizeof(struct DE_eckd_data) +
2706                                 sizeof(struct LO_eckd_data) +
2707                                 sizeof(struct eckd_count) +
2708                                 rpt * nr_tracks * sizeof(struct eckd_count);
2709                 break;
2710         case 0x04:      /* Invalidate track. */
2711         case 0x0c:      /* Invalidate track, use cdl. */
2712                 cplength = 3;
2713                 if (use_prefix)
2714                         datasize = sizeof(struct PFX_eckd_data) +
2715                                 sizeof(struct LO_eckd_data) +
2716                                 sizeof(struct eckd_count);
2717                 else
2718                         datasize = sizeof(struct DE_eckd_data) +
2719                                 sizeof(struct LO_eckd_data) +
2720                                 sizeof(struct eckd_count);
2721                 break;
2722         default:
2723                 dev_warn(&startdev->cdev->dev,
2724                          "An I/O control call used incorrect flags 0x%x\n",
2725                          fdata->intensity);
2726                 return ERR_PTR(-EINVAL);
2727         }
2728
2729         fcp = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2730         if (IS_ERR(fcp))
2731                 return fcp;
2732
2733         start_priv->count++;
2734         data = fcp->data;
2735         ccw = fcp->cpaddr;
2736
2737         switch (intensity & ~0x08) {
2738         case 0x00: /* Normal format. */
2739                 if (use_prefix) {
2740                         prefix(ccw++, (struct PFX_eckd_data *) data,
2741                                fdata->start_unit, fdata->stop_unit,
2742                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2743                         /* grant subsystem permission to format R0 */
2744                         if (r0_perm)
2745                                 ((struct PFX_eckd_data *)data)
2746                                         ->define_extent.ga_extended |= 0x04;
2747                         data += sizeof(struct PFX_eckd_data);
2748                 } else {
2749                         define_extent(ccw++, (struct DE_eckd_data *) data,
2750                                       fdata->start_unit, fdata->stop_unit,
2751                                       DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2752                         /* grant subsystem permission to format R0 */
2753                         if (r0_perm)
2754                                 ((struct DE_eckd_data *) data)
2755                                         ->ga_extended |= 0x04;
2756                         data += sizeof(struct DE_eckd_data);
2757                 }
2758                 ccw[-1].flags |= CCW_FLAG_CC;
2759                 locate_record(ccw++, (struct LO_eckd_data *) data,
2760                               fdata->start_unit, 0, rpt*nr_tracks,
2761                               DASD_ECKD_CCW_WRITE_CKD, base,
2762                               fdata->blksize);
2763                 data += sizeof(struct LO_eckd_data);
2764                 break;
2765         case 0x01: /* Write record zero + format track. */
2766                 if (use_prefix) {
2767                         prefix(ccw++, (struct PFX_eckd_data *) data,
2768                                fdata->start_unit, fdata->stop_unit,
2769                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2770                                base, startdev);
2771                         data += sizeof(struct PFX_eckd_data);
2772                 } else {
2773                         define_extent(ccw++, (struct DE_eckd_data *) data,
2774                                fdata->start_unit, fdata->stop_unit,
2775                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2776                         data += sizeof(struct DE_eckd_data);
2777                 }
2778                 ccw[-1].flags |= CCW_FLAG_CC;
2779                 locate_record(ccw++, (struct LO_eckd_data *) data,
2780                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2781                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2782                               base->block->bp_block);
2783                 data += sizeof(struct LO_eckd_data);
2784                 break;
2785         case 0x04: /* Invalidate track. */
2786                 if (use_prefix) {
2787                         prefix(ccw++, (struct PFX_eckd_data *) data,
2788                                fdata->start_unit, fdata->stop_unit,
2789                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2790                         data += sizeof(struct PFX_eckd_data);
2791                 } else {
2792                         define_extent(ccw++, (struct DE_eckd_data *) data,
2793                                fdata->start_unit, fdata->stop_unit,
2794                                DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2795                         data += sizeof(struct DE_eckd_data);
2796                 }
2797                 ccw[-1].flags |= CCW_FLAG_CC;
2798                 locate_record(ccw++, (struct LO_eckd_data *) data,
2799                               fdata->start_unit, 0, 1,
2800                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2801                 data += sizeof(struct LO_eckd_data);
2802                 break;
2803         }
2804
2805         for (j = 0; j < nr_tracks; j++) {
2806                 /* calculate cylinder and head for the current track */
2807                 set_ch_t(&address,
2808                          (fdata->start_unit + j) /
2809                          base_priv->rdc_data.trk_per_cyl,
2810                          (fdata->start_unit + j) %
2811                          base_priv->rdc_data.trk_per_cyl);
2812                 if (intensity & 0x01) { /* write record zero */
2813                         ect = (struct eckd_count *) data;
2814                         data += sizeof(struct eckd_count);
2815                         ect->cyl = address.cyl;
2816                         ect->head = address.head;
2817                         ect->record = 0;
2818                         ect->kl = 0;
2819                         ect->dl = 8;
2820                         ccw[-1].flags |= CCW_FLAG_CC;
2821                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2822                         ccw->flags = CCW_FLAG_SLI;
2823                         ccw->count = 8;
2824                         ccw->cda = (__u32)(addr_t) ect;
2825                         ccw++;
2826                 }
2827                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2828                         ect = (struct eckd_count *) data;
2829                         data += sizeof(struct eckd_count);
2830                         ect->cyl = address.cyl;
2831                         ect->head = address.head;
2832                         ect->record = 1;
2833                         ect->kl = 0;
2834                         ect->dl = 0;
2835                         ccw[-1].flags |= CCW_FLAG_CC;
2836                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2837                         ccw->flags = CCW_FLAG_SLI;
2838                         ccw->count = 8;
2839                         ccw->cda = (__u32)(addr_t) ect;
2840                 } else {                /* write remaining records */
2841                         for (i = 0; i < rpt; i++) {
2842                                 ect = (struct eckd_count *) data;
2843                                 data += sizeof(struct eckd_count);
2844                                 ect->cyl = address.cyl;
2845                                 ect->head = address.head;
2846                                 ect->record = i + 1;
2847                                 ect->kl = 0;
2848                                 ect->dl = fdata->blksize;
2849                                 /*
2850                                  * Check for special tracks 0-1
2851                                  * when formatting CDL
2852                                  */
2853                                 if ((intensity & 0x08) &&
2854                                     address.cyl == 0 && address.head == 0) {
2855                                         if (i < 3) {
2856                                                 ect->kl = 4;
2857                                                 ect->dl = sizes_trk0[i] - 4;
2858                                         }
2859                                 }
2860                                 if ((intensity & 0x08) &&
2861                                     address.cyl == 0 && address.head == 1) {
2862                                         ect->kl = 44;
2863                                         ect->dl = LABEL_SIZE - 44;
2864                                 }
2865                                 ccw[-1].flags |= CCW_FLAG_CC;
2866                                 if (i != 0 || j == 0)
2867                                         ccw->cmd_code =
2868                                                 DASD_ECKD_CCW_WRITE_CKD;
2869                                 else
2870                                         ccw->cmd_code =
2871                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2872                                 ccw->flags = CCW_FLAG_SLI;
2873                                 ccw->count = 8;
2874                                 ccw->cda = (__u32)(addr_t) ect;
2875                                 ccw++;
2876                         }
2877                 }
2878         }
2879
2880         fcp->startdev = startdev;
2881         fcp->memdev = startdev;
2882         fcp->basedev = base;
2883         fcp->retries = 256;
2884         fcp->expires = startdev->default_expires * HZ;
2885         fcp->buildclk = get_tod_clock();
2886         fcp->status = DASD_CQR_FILLED;
2887
2888         return fcp;
2889 }
2890
2891 /*
2892  * Wrapper function to build a CCW request depending on input data
2893  */
2894 static struct dasd_ccw_req *
2895 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2896                                struct format_data_t *fdata, int enable_pav,
2897                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2898 {
2899         struct dasd_ccw_req *ccw_req;
2900
2901         if (!fmt_buffer) {
2902                 ccw_req = dasd_eckd_build_format(base, NULL, fdata, enable_pav);
2903         } else {
2904                 if (tpm)
2905                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2906                                                             enable_pav,
2907                                                             fmt_buffer, rpt);
2908                 else
2909                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2910                                                         fmt_buffer, rpt);
2911         }
2912
2913         return ccw_req;
2914 }
2915
2916 /*
2917  * Sanity checks on format_data
2918  */
2919 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2920                                           struct format_data_t *fdata)
2921 {
2922         struct dasd_eckd_private *private = base->private;
2923
2924         if (fdata->start_unit >=
2925             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2926                 dev_warn(&base->cdev->dev,
2927                          "Start track number %u used in formatting is too big\n",
2928                          fdata->start_unit);
2929                 return -EINVAL;
2930         }
2931         if (fdata->stop_unit >=
2932             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2933                 dev_warn(&base->cdev->dev,
2934                          "Stop track number %u used in formatting is too big\n",
2935                          fdata->stop_unit);
2936                 return -EINVAL;
2937         }
2938         if (fdata->start_unit > fdata->stop_unit) {
2939                 dev_warn(&base->cdev->dev,
2940                          "Start track %u used in formatting exceeds end track\n",
2941                          fdata->start_unit);
2942                 return -EINVAL;
2943         }
2944         if (dasd_check_blocksize(fdata->blksize) != 0) {
2945                 dev_warn(&base->cdev->dev,
2946                          "The DASD cannot be formatted with block size %u\n",
2947                          fdata->blksize);
2948                 return -EINVAL;
2949         }
2950         return 0;
2951 }
2952
2953 /*
2954  * This function will process format_data originally coming from an IOCTL
2955  */
2956 static int dasd_eckd_format_process_data(struct dasd_device *base,
2957                                          struct format_data_t *fdata,
2958                                          int enable_pav, int tpm,
2959                                          struct eckd_count *fmt_buffer, int rpt,
2960                                          struct irb *irb)
2961 {
2962         struct dasd_eckd_private *private = base->private;
2963         struct dasd_ccw_req *cqr, *n;
2964         struct list_head format_queue;
2965         struct dasd_device *device;
2966         char *sense = NULL;
2967         int old_start, old_stop, format_step;
2968         int step, retry;
2969         int rc;
2970
2971         rc = dasd_eckd_format_sanity_checks(base, fdata);
2972         if (rc)
2973                 return rc;
2974
2975         INIT_LIST_HEAD(&format_queue);
2976
2977         old_start = fdata->start_unit;
2978         old_stop = fdata->stop_unit;
2979
2980         if (!tpm && fmt_buffer != NULL) {
2981                 /* Command Mode / Format Check */
2982                 format_step = 1;
2983         } else if (tpm && fmt_buffer != NULL) {
2984                 /* Transport Mode / Format Check */
2985                 format_step = DASD_CQR_MAX_CCW / rpt;
2986         } else {
2987                 /* Normal Formatting */
2988                 format_step = DASD_CQR_MAX_CCW /
2989                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
2990         }
2991
2992         do {
2993                 retry = 0;
2994                 while (fdata->start_unit <= old_stop) {
2995                         step = fdata->stop_unit - fdata->start_unit + 1;
2996                         if (step > format_step) {
2997                                 fdata->stop_unit =
2998                                         fdata->start_unit + format_step - 1;
2999                         }
3000
3001                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
3002                                                              enable_pav, tpm,
3003                                                              fmt_buffer, rpt);
3004                         if (IS_ERR(cqr)) {
3005                                 rc = PTR_ERR(cqr);
3006                                 if (rc == -ENOMEM) {
3007                                         if (list_empty(&format_queue))
3008                                                 goto out;
3009                                         /*
3010                                          * not enough memory available, start
3011                                          * requests retry after first requests
3012                                          * were finished
3013                                          */
3014                                         retry = 1;
3015                                         break;
3016                                 }
3017                                 goto out_err;
3018                         }
3019                         list_add_tail(&cqr->blocklist, &format_queue);
3020
3021                         if (fmt_buffer) {
3022                                 step = fdata->stop_unit - fdata->start_unit + 1;
3023                                 fmt_buffer += rpt * step;
3024                         }
3025                         fdata->start_unit = fdata->stop_unit + 1;
3026                         fdata->stop_unit = old_stop;
3027                 }
3028
3029                 rc = dasd_sleep_on_queue(&format_queue);
3030
3031 out_err:
3032                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
3033                         device = cqr->startdev;
3034                         private = device->private;
3035
3036                         if (cqr->status == DASD_CQR_FAILED) {
3037                                 /*
3038                                  * Only get sense data if called by format
3039                                  * check
3040                                  */
3041                                 if (fmt_buffer && irb) {
3042                                         sense = dasd_get_sense(&cqr->irb);
3043                                         memcpy(irb, &cqr->irb, sizeof(*irb));
3044                                 }
3045                                 rc = -EIO;
3046                         }
3047                         list_del_init(&cqr->blocklist);
3048                         dasd_ffree_request(cqr, device);
3049                         private->count--;
3050                 }
3051
3052                 if (rc && rc != -EIO)
3053                         goto out;
3054                 if (rc == -EIO) {
3055                         /*
3056                          * In case fewer than the expected records are on the
3057                          * track, we will most likely get a 'No Record Found'
3058                          * error (in command mode) or a 'File Protected' error
3059                          * (in transport mode). Those particular cases shouldn't
3060                          * pass the -EIO to the IOCTL, therefore reset the rc
3061                          * and continue.
3062                          */
3063                         if (sense &&
3064                             (sense[1] & SNS1_NO_REC_FOUND ||
3065                              sense[1] & SNS1_FILE_PROTECTED))
3066                                 retry = 1;
3067                         else
3068                                 goto out;
3069                 }
3070
3071         } while (retry);
3072
3073 out:
3074         fdata->start_unit = old_start;
3075         fdata->stop_unit = old_stop;
3076
3077         return rc;
3078 }
3079
3080 static int dasd_eckd_format_device(struct dasd_device *base,
3081                                    struct format_data_t *fdata, int enable_pav)
3082 {
3083         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
3084                                              0, NULL);
3085 }
3086
3087 static bool test_and_set_format_track(struct dasd_format_entry *to_format,
3088                                       struct dasd_block *block)
3089 {
3090         struct dasd_format_entry *format;
3091         unsigned long flags;
3092         bool rc = false;
3093
3094         spin_lock_irqsave(&block->format_lock, flags);
3095         list_for_each_entry(format, &block->format_list, list) {
3096                 if (format->track == to_format->track) {
3097                         rc = true;
3098                         goto out;
3099                 }
3100         }
3101         list_add_tail(&to_format->list, &block->format_list);
3102
3103 out:
3104         spin_unlock_irqrestore(&block->format_lock, flags);
3105         return rc;
3106 }
3107
3108 static void clear_format_track(struct dasd_format_entry *format,
3109                               struct dasd_block *block)
3110 {
3111         unsigned long flags;
3112
3113         spin_lock_irqsave(&block->format_lock, flags);
3114         list_del_init(&format->list);
3115         spin_unlock_irqrestore(&block->format_lock, flags);
3116 }
3117
3118 /*
3119  * Callback function to free ESE format requests.
3120  */
3121 static void dasd_eckd_ese_format_cb(struct dasd_ccw_req *cqr, void *data)
3122 {
3123         struct dasd_device *device = cqr->startdev;
3124         struct dasd_eckd_private *private = device->private;
3125         struct dasd_format_entry *format = data;
3126
3127         clear_format_track(format, cqr->basedev->block);
3128         private->count--;
3129         dasd_ffree_request(cqr, device);
3130 }
3131
3132 static struct dasd_ccw_req *
3133 dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr,
3134                      struct irb *irb)
3135 {
3136         struct dasd_eckd_private *private;
3137         struct dasd_format_entry *format;
3138         struct format_data_t fdata;
3139         unsigned int recs_per_trk;
3140         struct dasd_ccw_req *fcqr;
3141         struct dasd_device *base;
3142         struct dasd_block *block;
3143         unsigned int blksize;
3144         struct request *req;
3145         sector_t first_trk;
3146         sector_t last_trk;
3147         sector_t curr_trk;
3148         int rc;
3149
3150         req = cqr->callback_data;
3151         block = cqr->block;
3152         base = block->base;
3153         private = base->private;
3154         blksize = block->bp_block;
3155         recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3156         format = &startdev->format_entry;
3157
3158         first_trk = blk_rq_pos(req) >> block->s2b_shift;
3159         sector_div(first_trk, recs_per_trk);
3160         last_trk =
3161                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3162         sector_div(last_trk, recs_per_trk);
3163         rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3164         if (rc)
3165                 return ERR_PTR(rc);
3166
3167         if (curr_trk < first_trk || curr_trk > last_trk) {
3168                 DBF_DEV_EVENT(DBF_WARNING, startdev,
3169                               "ESE error track %llu not within range %llu - %llu\n",
3170                               curr_trk, first_trk, last_trk);
3171                 return ERR_PTR(-EINVAL);
3172         }
3173         format->track = curr_trk;
3174         /* test if track is already in formatting by another thread */
3175         if (test_and_set_format_track(format, block))
3176                 return ERR_PTR(-EEXIST);
3177
3178         fdata.start_unit = curr_trk;
3179         fdata.stop_unit = curr_trk;
3180         fdata.blksize = blksize;
3181         fdata.intensity = private->uses_cdl ? DASD_FMT_INT_COMPAT : 0;
3182
3183         rc = dasd_eckd_format_sanity_checks(base, &fdata);
3184         if (rc)
3185                 return ERR_PTR(-EINVAL);
3186
3187         /*
3188          * We're building the request with PAV disabled as we're reusing
3189          * the former startdev.
3190          */
3191         fcqr = dasd_eckd_build_format(base, startdev, &fdata, 0);
3192         if (IS_ERR(fcqr))
3193                 return fcqr;
3194
3195         fcqr->callback = dasd_eckd_ese_format_cb;
3196         fcqr->callback_data = (void *) format;
3197
3198         return fcqr;
3199 }
3200
3201 /*
3202  * When data is read from an unformatted area of an ESE volume, this function
3203  * returns zeroed data and thereby mimics a read of zero data.
3204  *
3205  * The first unformatted track is the one that got the NRF error, the address is
3206  * encoded in the sense data.
3207  *
3208  * All tracks before have returned valid data and should not be touched.
3209  * All tracks after the unformatted track might be formatted or not. This is
3210  * currently not known, remember the processed data and return the remainder of
3211  * the request to the blocklayer in __dasd_cleanup_cqr().
3212  */
3213 static int dasd_eckd_ese_read(struct dasd_ccw_req *cqr, struct irb *irb)
3214 {
3215         struct dasd_eckd_private *private;
3216         sector_t first_trk, last_trk;
3217         sector_t first_blk, last_blk;
3218         unsigned int blksize, off;
3219         unsigned int recs_per_trk;
3220         struct dasd_device *base;
3221         struct req_iterator iter;
3222         struct dasd_block *block;
3223         unsigned int skip_block;
3224         unsigned int blk_count;
3225         struct request *req;
3226         struct bio_vec bv;
3227         sector_t curr_trk;
3228         sector_t end_blk;
3229         char *dst;
3230         int rc;
3231
3232         req = (struct request *) cqr->callback_data;
3233         base = cqr->block->base;
3234         blksize = base->block->bp_block;
3235         block =  cqr->block;
3236         private = base->private;
3237         skip_block = 0;
3238         blk_count = 0;
3239
3240         recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3241         first_trk = first_blk = blk_rq_pos(req) >> block->s2b_shift;
3242         sector_div(first_trk, recs_per_trk);
3243         last_trk = last_blk =
3244                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3245         sector_div(last_trk, recs_per_trk);
3246         rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3247         if (rc)
3248                 return rc;
3249
3250         /* sanity check if the current track from sense data is valid */
3251         if (curr_trk < first_trk || curr_trk > last_trk) {
3252                 DBF_DEV_EVENT(DBF_WARNING, base,
3253                               "ESE error track %llu not within range %llu - %llu\n",
3254                               curr_trk, first_trk, last_trk);
3255                 return -EINVAL;
3256         }
3257
3258         /*
3259          * if not the first track got the NRF error we have to skip over valid
3260          * blocks
3261          */
3262         if (curr_trk != first_trk)
3263                 skip_block = curr_trk * recs_per_trk - first_blk;
3264
3265         /* we have no information beyond the current track */
3266         end_blk = (curr_trk + 1) * recs_per_trk;
3267
3268         rq_for_each_segment(bv, req, iter) {
3269                 dst = page_address(bv.bv_page) + bv.bv_offset;
3270                 for (off = 0; off < bv.bv_len; off += blksize) {
3271                         if (first_blk + blk_count >= end_blk) {
3272                                 cqr->proc_bytes = blk_count * blksize;
3273                                 return 0;
3274                         }
3275                         if (dst && !skip_block) {
3276                                 dst += off;
3277                                 memset(dst, 0, blksize);
3278                         } else {
3279                                 skip_block--;
3280                         }
3281                         blk_count++;
3282                 }
3283         }
3284         return 0;
3285 }
3286
3287 /*
3288  * Helper function to count consecutive records of a single track.
3289  */
3290 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
3291                                    int max)
3292 {
3293         int head;
3294         int i;
3295
3296         head = fmt_buffer[start].head;
3297
3298         /*
3299          * There are 3 conditions where we stop counting:
3300          * - if data reoccurs (same head and record may reoccur), which may
3301          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
3302          * - when the head changes, because we're iterating over several tracks
3303          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
3304          * - when we've reached the end of sensible data in the buffer (the
3305          *   record will be 0 then)
3306          */
3307         for (i = start; i < max; i++) {
3308                 if (i > start) {
3309                         if ((fmt_buffer[i].head == head &&
3310                             fmt_buffer[i].record == 1) ||
3311                             fmt_buffer[i].head != head ||
3312                             fmt_buffer[i].record == 0)
3313                                 break;
3314                 }
3315         }
3316
3317         return i - start;
3318 }
3319
3320 /*
3321  * Evaluate a given range of tracks. Data like number of records, blocksize,
3322  * record ids, and key length are compared with expected data.
3323  *
3324  * If a mismatch occurs, the corresponding error bit is set, as well as
3325  * additional information, depending on the error.
3326  */
3327 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
3328                                              struct format_check_t *cdata,
3329                                              int rpt_max, int rpt_exp,
3330                                              int trk_per_cyl, int tpm)
3331 {
3332         struct ch_t geo;
3333         int max_entries;
3334         int count = 0;
3335         int trkcount;
3336         int blksize;
3337         int pos = 0;
3338         int i, j;
3339         int kl;
3340
3341         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3342         max_entries = trkcount * rpt_max;
3343
3344         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
3345                 /* Calculate the correct next starting position in the buffer */
3346                 if (tpm) {
3347                         while (fmt_buffer[pos].record == 0 &&
3348                                fmt_buffer[pos].dl == 0) {
3349                                 if (pos++ > max_entries)
3350                                         break;
3351                         }
3352                 } else {
3353                         if (i != cdata->expect.start_unit)
3354                                 pos += rpt_max - count;
3355                 }
3356
3357                 /* Calculate the expected geo values for the current track */
3358                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
3359
3360                 /* Count and check number of records */
3361                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
3362
3363                 if (count < rpt_exp) {
3364                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
3365                         break;
3366                 }
3367                 if (count > rpt_exp) {
3368                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
3369                         break;
3370                 }
3371
3372                 for (j = 0; j < count; j++, pos++) {
3373                         blksize = cdata->expect.blksize;
3374                         kl = 0;
3375
3376                         /*
3377                          * Set special values when checking CDL formatted
3378                          * devices.
3379                          */
3380                         if ((cdata->expect.intensity & 0x08) &&
3381                             geo.cyl == 0 && geo.head == 0) {
3382                                 if (j < 3) {
3383                                         blksize = sizes_trk0[j] - 4;
3384                                         kl = 4;
3385                                 }
3386                         }
3387                         if ((cdata->expect.intensity & 0x08) &&
3388                             geo.cyl == 0 && geo.head == 1) {
3389                                 blksize = LABEL_SIZE - 44;
3390                                 kl = 44;
3391                         }
3392
3393                         /* Check blocksize */
3394                         if (fmt_buffer[pos].dl != blksize) {
3395                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
3396                                 goto out;
3397                         }
3398                         /* Check if key length is 0 */
3399                         if (fmt_buffer[pos].kl != kl) {
3400                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
3401                                 goto out;
3402                         }
3403                         /* Check if record_id is correct */
3404                         if (fmt_buffer[pos].cyl != geo.cyl ||
3405                             fmt_buffer[pos].head != geo.head ||
3406                             fmt_buffer[pos].record != (j + 1)) {
3407                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
3408                                 goto out;
3409                         }
3410                 }
3411         }
3412
3413 out:
3414         /*
3415          * In case of no errors, we need to decrease by one
3416          * to get the correct positions.
3417          */
3418         if (!cdata->result) {
3419                 i--;
3420                 pos--;
3421         }
3422
3423         cdata->unit = i;
3424         cdata->num_records = count;
3425         cdata->rec = fmt_buffer[pos].record;
3426         cdata->blksize = fmt_buffer[pos].dl;
3427         cdata->key_length = fmt_buffer[pos].kl;
3428 }
3429
3430 /*
3431  * Check the format of a range of tracks of a DASD.
3432  */
3433 static int dasd_eckd_check_device_format(struct dasd_device *base,
3434                                          struct format_check_t *cdata,
3435                                          int enable_pav)
3436 {
3437         struct dasd_eckd_private *private = base->private;
3438         struct eckd_count *fmt_buffer;
3439         struct irb irb;
3440         int rpt_max, rpt_exp;
3441         int fmt_buffer_size;
3442         int trk_per_cyl;
3443         int trkcount;
3444         int tpm = 0;
3445         int rc;
3446
3447         trk_per_cyl = private->rdc_data.trk_per_cyl;
3448
3449         /* Get maximum and expected amount of records per track */
3450         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
3451         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
3452
3453         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3454         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
3455
3456         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
3457         if (!fmt_buffer)
3458                 return -ENOMEM;
3459
3460         /*
3461          * A certain FICON feature subset is needed to operate in transport
3462          * mode. Additionally, the support for transport mode is implicitly
3463          * checked by comparing the buffer size with fcx_max_data. As long as
3464          * the buffer size is smaller we can operate in transport mode and
3465          * process multiple tracks. If not, only one track at once is being
3466          * processed using command mode.
3467          */
3468         if ((private->features.feature[40] & 0x04) &&
3469             fmt_buffer_size <= private->fcx_max_data)
3470                 tpm = 1;
3471
3472         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
3473                                            tpm, fmt_buffer, rpt_max, &irb);
3474         if (rc && rc != -EIO)
3475                 goto out;
3476         if (rc == -EIO) {
3477                 /*
3478                  * If our first attempt with transport mode enabled comes back
3479                  * with an incorrect length error, we're going to retry the
3480                  * check with command mode.
3481                  */
3482                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
3483                         tpm = 0;
3484                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
3485                                                            enable_pav, tpm,
3486                                                            fmt_buffer, rpt_max,
3487                                                            &irb);
3488                         if (rc)
3489                                 goto out;
3490                 } else {
3491                         goto out;
3492                 }
3493         }
3494
3495         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
3496                                          trk_per_cyl, tpm);
3497
3498 out:
3499         kfree(fmt_buffer);
3500
3501         return rc;
3502 }
3503
3504 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
3505 {
3506         if (cqr->retries < 0) {
3507                 cqr->status = DASD_CQR_FAILED;
3508                 return;
3509         }
3510         cqr->status = DASD_CQR_FILLED;
3511         if (cqr->block && (cqr->startdev != cqr->block->base)) {
3512                 dasd_eckd_reset_ccw_to_base_io(cqr);
3513                 cqr->startdev = cqr->block->base;
3514                 cqr->lpm = dasd_path_get_opm(cqr->block->base);
3515         }
3516 };
3517
3518 static dasd_erp_fn_t
3519 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
3520 {
3521         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
3522         struct ccw_device *cdev = device->cdev;
3523
3524         switch (cdev->id.cu_type) {
3525         case 0x3990:
3526         case 0x2105:
3527         case 0x2107:
3528         case 0x1750:
3529                 return dasd_3990_erp_action;
3530         case 0x9343:
3531         case 0x3880:
3532         default:
3533                 return dasd_default_erp_action;
3534         }
3535 }
3536
3537 static dasd_erp_fn_t
3538 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3539 {
3540         return dasd_default_erp_postaction;
3541 }
3542
3543 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3544                                               struct dasd_ccw_req *cqr,
3545                                               struct irb *irb)
3546 {
3547         char mask;
3548         char *sense = NULL;
3549         struct dasd_eckd_private *private = device->private;
3550
3551         /* first of all check for state change pending interrupt */
3552         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3553         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3554                 /*
3555                  * for alias only, not in offline processing
3556                  * and only if not suspended
3557                  */
3558                 if (!device->block && private->lcu &&
3559                     device->state == DASD_STATE_ONLINE &&
3560                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3561                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3562                         /* schedule worker to reload device */
3563                         dasd_reload_device(device);
3564                 }
3565                 dasd_generic_handle_state_change(device);
3566                 return;
3567         }
3568
3569         sense = dasd_get_sense(irb);
3570         if (!sense)
3571                 return;
3572
3573         /* summary unit check */
3574         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3575             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3576                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3577                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3578                                       "eckd suc: device already notified");
3579                         return;
3580                 }
3581                 sense = dasd_get_sense(irb);
3582                 if (!sense) {
3583                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3584                                       "eckd suc: no reason code available");
3585                         clear_bit(DASD_FLAG_SUC, &device->flags);
3586                         return;
3587
3588                 }
3589                 private->suc_reason = sense[8];
3590                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3591                               "eckd handle summary unit check: reason",
3592                               private->suc_reason);
3593                 dasd_get_device(device);
3594                 if (!schedule_work(&device->suc_work))
3595                         dasd_put_device(device);
3596
3597                 return;
3598         }
3599
3600         /* service information message SIM */
3601         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3602             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3603                 dasd_3990_erp_handle_sim(device, sense);
3604                 return;
3605         }
3606
3607         /* loss of device reservation is handled via base devices only
3608          * as alias devices may be used with several bases
3609          */
3610         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3611             (sense[7] == 0x3F) &&
3612             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3613             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3614                 if (device->features & DASD_FEATURE_FAILONSLCK)
3615                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3616                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3617                 dev_err(&device->cdev->dev,
3618                         "The device reservation was lost\n");
3619         }
3620 }
3621
3622 static int dasd_eckd_ras_sanity_checks(struct dasd_device *device,
3623                                        unsigned int first_trk,
3624                                        unsigned int last_trk)
3625 {
3626         struct dasd_eckd_private *private = device->private;
3627         unsigned int trks_per_vol;
3628         int rc = 0;
3629
3630         trks_per_vol = private->real_cyl * private->rdc_data.trk_per_cyl;
3631
3632         if (first_trk >= trks_per_vol) {
3633                 dev_warn(&device->cdev->dev,
3634                          "Start track number %u used in the space release command is too big\n",
3635                          first_trk);
3636                 rc = -EINVAL;
3637         } else if (last_trk >= trks_per_vol) {
3638                 dev_warn(&device->cdev->dev,
3639                          "Stop track number %u used in the space release command is too big\n",
3640                          last_trk);
3641                 rc = -EINVAL;
3642         } else if (first_trk > last_trk) {
3643                 dev_warn(&device->cdev->dev,
3644                          "Start track %u used in the space release command exceeds the end track\n",
3645                          first_trk);
3646                 rc = -EINVAL;
3647         }
3648         return rc;
3649 }
3650
3651 /*
3652  * Helper function to count the amount of involved extents within a given range
3653  * with extent alignment in mind.
3654  */
3655 static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
3656 {
3657         int cur_pos = 0;
3658         int count = 0;
3659         int tmp;
3660
3661         if (from == to)
3662                 return 1;
3663
3664         /* Count first partial extent */
3665         if (from % trks_per_ext != 0) {
3666                 tmp = from + trks_per_ext - (from % trks_per_ext) - 1;
3667                 if (tmp > to)
3668                         tmp = to;
3669                 cur_pos = tmp - from + 1;
3670                 count++;
3671         }
3672         /* Count full extents */
3673         if (to - (from + cur_pos) + 1 >= trks_per_ext) {
3674                 tmp = to - ((to - trks_per_ext + 1) % trks_per_ext);
3675                 count += (tmp - (from + cur_pos) + 1) / trks_per_ext;
3676                 cur_pos = tmp;
3677         }
3678         /* Count last partial extent */
3679         if (cur_pos < to)
3680                 count++;
3681
3682         return count;
3683 }
3684
3685 /*
3686  * Release allocated space for a given range or an entire volume.
3687  */
3688 static struct dasd_ccw_req *
3689 dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
3690                   struct request *req, unsigned int first_trk,
3691                   unsigned int last_trk, int by_extent)
3692 {
3693         struct dasd_eckd_private *private = device->private;
3694         struct dasd_dso_ras_ext_range *ras_range;
3695         struct dasd_rssd_features *features;
3696         struct dasd_dso_ras_data *ras_data;
3697         u16 heads, beg_head, end_head;
3698         int cur_to_trk, cur_from_trk;
3699         struct dasd_ccw_req *cqr;
3700         u32 beg_cyl, end_cyl;
3701         struct ccw1 *ccw;
3702         int trks_per_ext;
3703         size_t ras_size;
3704         size_t size;
3705         int nr_exts;
3706         void *rq;
3707         int i;
3708
3709         if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
3710                 return ERR_PTR(-EINVAL);
3711
3712         rq = req ? blk_mq_rq_to_pdu(req) : NULL;
3713
3714         features = &private->features;
3715
3716         trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3717         nr_exts = 0;
3718         if (by_extent)
3719                 nr_exts = count_exts(first_trk, last_trk, trks_per_ext);
3720         ras_size = sizeof(*ras_data);
3721         size = ras_size + (nr_exts * sizeof(*ras_range));
3722
3723         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, size, device, rq);
3724         if (IS_ERR(cqr)) {
3725                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
3726                                 "Could not allocate RAS request");
3727                 return cqr;
3728         }
3729
3730         ras_data = cqr->data;
3731         memset(ras_data, 0, size);
3732
3733         ras_data->order = DSO_ORDER_RAS;
3734         ras_data->flags.vol_type = 0; /* CKD volume */
3735         /* Release specified extents or entire volume */
3736         ras_data->op_flags.by_extent = by_extent;
3737         /*
3738          * This bit guarantees initialisation of tracks within an extent that is
3739          * not fully specified, but is only supported with a certain feature
3740          * subset.
3741          */
3742         ras_data->op_flags.guarantee_init = !!(features->feature[56] & 0x01);
3743         ras_data->lss = private->ned->ID;
3744         ras_data->dev_addr = private->ned->unit_addr;
3745         ras_data->nr_exts = nr_exts;
3746
3747         if (by_extent) {
3748                 heads = private->rdc_data.trk_per_cyl;
3749                 cur_from_trk = first_trk;
3750                 cur_to_trk = first_trk + trks_per_ext -
3751                         (first_trk % trks_per_ext) - 1;
3752                 if (cur_to_trk > last_trk)
3753                         cur_to_trk = last_trk;
3754                 ras_range = (struct dasd_dso_ras_ext_range *)(cqr->data + ras_size);
3755
3756                 for (i = 0; i < nr_exts; i++) {
3757                         beg_cyl = cur_from_trk / heads;
3758                         beg_head = cur_from_trk % heads;
3759                         end_cyl = cur_to_trk / heads;
3760                         end_head = cur_to_trk % heads;
3761
3762                         set_ch_t(&ras_range->beg_ext, beg_cyl, beg_head);
3763                         set_ch_t(&ras_range->end_ext, end_cyl, end_head);
3764
3765                         cur_from_trk = cur_to_trk + 1;
3766                         cur_to_trk = cur_from_trk + trks_per_ext - 1;
3767                         if (cur_to_trk > last_trk)
3768                                 cur_to_trk = last_trk;
3769                         ras_range++;
3770                 }
3771         }
3772
3773         ccw = cqr->cpaddr;
3774         ccw->cda = (__u32)(addr_t)cqr->data;
3775         ccw->cmd_code = DASD_ECKD_CCW_DSO;
3776         ccw->count = size;
3777
3778         cqr->startdev = device;
3779         cqr->memdev = device;
3780         cqr->block = block;
3781         cqr->retries = 256;
3782         cqr->expires = device->default_expires * HZ;
3783         cqr->buildclk = get_tod_clock();
3784         cqr->status = DASD_CQR_FILLED;
3785
3786         return cqr;
3787 }
3788
3789 static int dasd_eckd_release_space_full(struct dasd_device *device)
3790 {
3791         struct dasd_ccw_req *cqr;
3792         int rc;
3793
3794         cqr = dasd_eckd_dso_ras(device, NULL, NULL, 0, 0, 0);
3795         if (IS_ERR(cqr))
3796                 return PTR_ERR(cqr);
3797
3798         rc = dasd_sleep_on_interruptible(cqr);
3799
3800         dasd_sfree_request(cqr, cqr->memdev);
3801
3802         return rc;
3803 }
3804
3805 static int dasd_eckd_release_space_trks(struct dasd_device *device,
3806                                         unsigned int from, unsigned int to)
3807 {
3808         struct dasd_eckd_private *private = device->private;
3809         struct dasd_block *block = device->block;
3810         struct dasd_ccw_req *cqr, *n;
3811         struct list_head ras_queue;
3812         unsigned int device_exts;
3813         int trks_per_ext;
3814         int stop, step;
3815         int cur_pos;
3816         int rc = 0;
3817         int retry;
3818
3819         INIT_LIST_HEAD(&ras_queue);
3820
3821         device_exts = private->real_cyl / dasd_eckd_ext_size(device);
3822         trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3823
3824         /* Make sure device limits are not exceeded */
3825         step = trks_per_ext * min(device_exts, DASD_ECKD_RAS_EXTS_MAX);
3826         cur_pos = from;
3827
3828         do {
3829                 retry = 0;
3830                 while (cur_pos < to) {
3831                         stop = cur_pos + step -
3832                                 ((cur_pos + step) % trks_per_ext) - 1;
3833                         if (stop > to)
3834                                 stop = to;
3835
3836                         cqr = dasd_eckd_dso_ras(device, NULL, NULL, cur_pos, stop, 1);
3837                         if (IS_ERR(cqr)) {
3838                                 rc = PTR_ERR(cqr);
3839                                 if (rc == -ENOMEM) {
3840                                         if (list_empty(&ras_queue))
3841                                                 goto out;
3842                                         retry = 1;
3843                                         break;
3844                                 }
3845                                 goto err_out;
3846                         }
3847
3848                         spin_lock_irq(&block->queue_lock);
3849                         list_add_tail(&cqr->blocklist, &ras_queue);
3850                         spin_unlock_irq(&block->queue_lock);
3851                         cur_pos = stop + 1;
3852                 }
3853
3854                 rc = dasd_sleep_on_queue_interruptible(&ras_queue);
3855
3856 err_out:
3857                 list_for_each_entry_safe(cqr, n, &ras_queue, blocklist) {
3858                         device = cqr->startdev;
3859                         private = device->private;
3860
3861                         spin_lock_irq(&block->queue_lock);
3862                         list_del_init(&cqr->blocklist);
3863                         spin_unlock_irq(&block->queue_lock);
3864                         dasd_sfree_request(cqr, device);
3865                         private->count--;
3866                 }
3867         } while (retry);
3868
3869 out:
3870         return rc;
3871 }
3872
3873 static int dasd_eckd_release_space(struct dasd_device *device,
3874                                    struct format_data_t *rdata)
3875 {
3876         if (rdata->intensity & DASD_FMT_INT_ESE_FULL)
3877                 return dasd_eckd_release_space_full(device);
3878         else if (rdata->intensity == 0)
3879                 return dasd_eckd_release_space_trks(device, rdata->start_unit,
3880                                                     rdata->stop_unit);
3881         else
3882                 return -EINVAL;
3883 }
3884
3885 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3886                                                struct dasd_device *startdev,
3887                                                struct dasd_block *block,
3888                                                struct request *req,
3889                                                sector_t first_rec,
3890                                                sector_t last_rec,
3891                                                sector_t first_trk,
3892                                                sector_t last_trk,
3893                                                unsigned int first_offs,
3894                                                unsigned int last_offs,
3895                                                unsigned int blk_per_trk,
3896                                                unsigned int blksize)
3897 {
3898         struct dasd_eckd_private *private;
3899         unsigned long *idaws;
3900         struct LO_eckd_data *LO_data;
3901         struct dasd_ccw_req *cqr;
3902         struct ccw1 *ccw;
3903         struct req_iterator iter;
3904         struct bio_vec bv;
3905         char *dst;
3906         unsigned int off;
3907         int count, cidaw, cplength, datasize;
3908         sector_t recid;
3909         unsigned char cmd, rcmd;
3910         int use_prefix;
3911         struct dasd_device *basedev;
3912
3913         basedev = block->base;
3914         private = basedev->private;
3915         if (rq_data_dir(req) == READ)
3916                 cmd = DASD_ECKD_CCW_READ_MT;
3917         else if (rq_data_dir(req) == WRITE)
3918                 cmd = DASD_ECKD_CCW_WRITE_MT;
3919         else
3920                 return ERR_PTR(-EINVAL);
3921
3922         /* Check struct bio and count the number of blocks for the request. */
3923         count = 0;
3924         cidaw = 0;
3925         rq_for_each_segment(bv, req, iter) {
3926                 if (bv.bv_len & (blksize - 1))
3927                         /* Eckd can only do full blocks. */
3928                         return ERR_PTR(-EINVAL);
3929                 count += bv.bv_len >> (block->s2b_shift + 9);
3930                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3931                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3932         }
3933         /* Paranoia. */
3934         if (count != last_rec - first_rec + 1)
3935                 return ERR_PTR(-EINVAL);
3936
3937         /* use the prefix command if available */
3938         use_prefix = private->features.feature[8] & 0x01;
3939         if (use_prefix) {
3940                 /* 1x prefix + number of blocks */
3941                 cplength = 2 + count;
3942                 /* 1x prefix + cidaws*sizeof(long) */
3943                 datasize = sizeof(struct PFX_eckd_data) +
3944                         sizeof(struct LO_eckd_data) +
3945                         cidaw * sizeof(unsigned long);
3946         } else {
3947                 /* 1x define extent + 1x locate record + number of blocks */
3948                 cplength = 2 + count;
3949                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3950                 datasize = sizeof(struct DE_eckd_data) +
3951                         sizeof(struct LO_eckd_data) +
3952                         cidaw * sizeof(unsigned long);
3953         }
3954         /* Find out the number of additional locate record ccws for cdl. */
3955         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3956                 if (last_rec >= 2*blk_per_trk)
3957                         count = 2*blk_per_trk - first_rec;
3958                 cplength += count;
3959                 datasize += count*sizeof(struct LO_eckd_data);
3960         }
3961         /* Allocate the ccw request. */
3962         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3963                                    startdev, blk_mq_rq_to_pdu(req));
3964         if (IS_ERR(cqr))
3965                 return cqr;
3966         ccw = cqr->cpaddr;
3967         /* First ccw is define extent or prefix. */
3968         if (use_prefix) {
3969                 if (prefix(ccw++, cqr->data, first_trk,
3970                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
3971                         /* Clock not in sync and XRC is enabled.
3972                          * Try again later.
3973                          */
3974                         dasd_sfree_request(cqr, startdev);
3975                         return ERR_PTR(-EAGAIN);
3976                 }
3977                 idaws = (unsigned long *) (cqr->data +
3978                                            sizeof(struct PFX_eckd_data));
3979         } else {
3980                 if (define_extent(ccw++, cqr->data, first_trk,
3981                                   last_trk, cmd, basedev, 0) == -EAGAIN) {
3982                         /* Clock not in sync and XRC is enabled.
3983                          * Try again later.
3984                          */
3985                         dasd_sfree_request(cqr, startdev);
3986                         return ERR_PTR(-EAGAIN);
3987                 }
3988                 idaws = (unsigned long *) (cqr->data +
3989                                            sizeof(struct DE_eckd_data));
3990         }
3991         /* Build locate_record+read/write/ccws. */
3992         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3993         recid = first_rec;
3994         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3995                 /* Only standard blocks so there is just one locate record. */
3996                 ccw[-1].flags |= CCW_FLAG_CC;
3997                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3998                               last_rec - recid + 1, cmd, basedev, blksize);
3999         }
4000         rq_for_each_segment(bv, req, iter) {
4001                 dst = page_address(bv.bv_page) + bv.bv_offset;
4002                 if (dasd_page_cache) {
4003                         char *copy = kmem_cache_alloc(dasd_page_cache,
4004                                                       GFP_DMA | __GFP_NOWARN);
4005                         if (copy && rq_data_dir(req) == WRITE)
4006                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
4007                         if (copy)
4008                                 dst = copy + bv.bv_offset;
4009                 }
4010                 for (off = 0; off < bv.bv_len; off += blksize) {
4011                         sector_t trkid = recid;
4012                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
4013                         rcmd = cmd;
4014                         count = blksize;
4015                         /* Locate record for cdl special block ? */
4016                         if (private->uses_cdl && recid < 2*blk_per_trk) {
4017                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
4018                                         rcmd |= 0x8;
4019                                         count = dasd_eckd_cdl_reclen(recid);
4020                                         if (count < blksize &&
4021                                             rq_data_dir(req) == READ)
4022                                                 memset(dst + count, 0xe5,
4023                                                        blksize - count);
4024                                 }
4025                                 ccw[-1].flags |= CCW_FLAG_CC;
4026                                 locate_record(ccw++, LO_data++,
4027                                               trkid, recoffs + 1,
4028                                               1, rcmd, basedev, count);
4029                         }
4030                         /* Locate record for standard blocks ? */
4031                         if (private->uses_cdl && recid == 2*blk_per_trk) {
4032                                 ccw[-1].flags |= CCW_FLAG_CC;
4033                                 locate_record(ccw++, LO_data++,
4034                                               trkid, recoffs + 1,
4035                                               last_rec - recid + 1,
4036                                               cmd, basedev, count);
4037                         }
4038                         /* Read/write ccw. */
4039                         ccw[-1].flags |= CCW_FLAG_CC;
4040                         ccw->cmd_code = rcmd;
4041                         ccw->count = count;
4042                         if (idal_is_needed(dst, blksize)) {
4043                                 ccw->cda = (__u32)(addr_t) idaws;
4044                                 ccw->flags = CCW_FLAG_IDA;
4045                                 idaws = idal_create_words(idaws, dst, blksize);
4046                         } else {
4047                                 ccw->cda = (__u32)(addr_t) dst;
4048                                 ccw->flags = 0;
4049                         }
4050                         ccw++;
4051                         dst += blksize;
4052                         recid++;
4053                 }
4054         }
4055         if (blk_noretry_request(req) ||
4056             block->base->features & DASD_FEATURE_FAILFAST)
4057                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4058         cqr->startdev = startdev;
4059         cqr->memdev = startdev;
4060         cqr->block = block;
4061         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4062         cqr->lpm = dasd_path_get_ppm(startdev);
4063         cqr->retries = startdev->default_retries;
4064         cqr->buildclk = get_tod_clock();
4065         cqr->status = DASD_CQR_FILLED;
4066
4067         /* Set flags to suppress output for expected errors */
4068         if (dasd_eckd_is_ese(basedev)) {
4069                 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4070                 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4071                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4072         }
4073
4074         return cqr;
4075 }
4076
4077 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
4078                                                struct dasd_device *startdev,
4079                                                struct dasd_block *block,
4080                                                struct request *req,
4081                                                sector_t first_rec,
4082                                                sector_t last_rec,
4083                                                sector_t first_trk,
4084                                                sector_t last_trk,
4085                                                unsigned int first_offs,
4086                                                unsigned int last_offs,
4087                                                unsigned int blk_per_trk,
4088                                                unsigned int blksize)
4089 {
4090         unsigned long *idaws;
4091         struct dasd_ccw_req *cqr;
4092         struct ccw1 *ccw;
4093         struct req_iterator iter;
4094         struct bio_vec bv;
4095         char *dst, *idaw_dst;
4096         unsigned int cidaw, cplength, datasize;
4097         unsigned int tlf;
4098         sector_t recid;
4099         unsigned char cmd;
4100         struct dasd_device *basedev;
4101         unsigned int trkcount, count, count_to_trk_end;
4102         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
4103         unsigned char new_track, end_idaw;
4104         sector_t trkid;
4105         unsigned int recoffs;
4106
4107         basedev = block->base;
4108         if (rq_data_dir(req) == READ)
4109                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4110         else if (rq_data_dir(req) == WRITE)
4111                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4112         else
4113                 return ERR_PTR(-EINVAL);
4114
4115         /* Track based I/O needs IDAWs for each page, and not just for
4116          * 64 bit addresses. We need additional idals for pages
4117          * that get filled from two tracks, so we use the number
4118          * of records as upper limit.
4119          */
4120         cidaw = last_rec - first_rec + 1;
4121         trkcount = last_trk - first_trk + 1;
4122
4123         /* 1x prefix + one read/write ccw per track */
4124         cplength = 1 + trkcount;
4125
4126         datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
4127
4128         /* Allocate the ccw request. */
4129         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4130                                    startdev, blk_mq_rq_to_pdu(req));
4131         if (IS_ERR(cqr))
4132                 return cqr;
4133         ccw = cqr->cpaddr;
4134         /* transfer length factor: how many bytes to read from the last track */
4135         if (first_trk == last_trk)
4136                 tlf = last_offs - first_offs + 1;
4137         else
4138                 tlf = last_offs + 1;
4139         tlf *= blksize;
4140
4141         if (prefix_LRE(ccw++, cqr->data, first_trk,
4142                        last_trk, cmd, basedev, startdev,
4143                        1 /* format */, first_offs + 1,
4144                        trkcount, blksize,
4145                        tlf) == -EAGAIN) {
4146                 /* Clock not in sync and XRC is enabled.
4147                  * Try again later.
4148                  */
4149                 dasd_sfree_request(cqr, startdev);
4150                 return ERR_PTR(-EAGAIN);
4151         }
4152
4153         /*
4154          * The translation of request into ccw programs must meet the
4155          * following conditions:
4156          * - all idaws but the first and the last must address full pages
4157          *   (or 2K blocks on 31-bit)
4158          * - the scope of a ccw and it's idal ends with the track boundaries
4159          */
4160         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
4161         recid = first_rec;
4162         new_track = 1;
4163         end_idaw = 0;
4164         len_to_track_end = 0;
4165         idaw_dst = NULL;
4166         idaw_len = 0;
4167         rq_for_each_segment(bv, req, iter) {
4168                 dst = page_address(bv.bv_page) + bv.bv_offset;
4169                 seg_len = bv.bv_len;
4170                 while (seg_len) {
4171                         if (new_track) {
4172                                 trkid = recid;
4173                                 recoffs = sector_div(trkid, blk_per_trk);
4174                                 count_to_trk_end = blk_per_trk - recoffs;
4175                                 count = min((last_rec - recid + 1),
4176                                             (sector_t)count_to_trk_end);
4177                                 len_to_track_end = count * blksize;
4178                                 ccw[-1].flags |= CCW_FLAG_CC;
4179                                 ccw->cmd_code = cmd;
4180                                 ccw->count = len_to_track_end;
4181                                 ccw->cda = (__u32)(addr_t)idaws;
4182                                 ccw->flags = CCW_FLAG_IDA;
4183                                 ccw++;
4184                                 recid += count;
4185                                 new_track = 0;
4186                                 /* first idaw for a ccw may start anywhere */
4187                                 if (!idaw_dst)
4188                                         idaw_dst = dst;
4189                         }
4190                         /* If we start a new idaw, we must make sure that it
4191                          * starts on an IDA_BLOCK_SIZE boundary.
4192                          * If we continue an idaw, we must make sure that the
4193                          * current segment begins where the so far accumulated
4194                          * idaw ends
4195                          */
4196                         if (!idaw_dst) {
4197                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
4198                                         dasd_sfree_request(cqr, startdev);
4199                                         return ERR_PTR(-ERANGE);
4200                                 } else
4201                                         idaw_dst = dst;
4202                         }
4203                         if ((idaw_dst + idaw_len) != dst) {
4204                                 dasd_sfree_request(cqr, startdev);
4205                                 return ERR_PTR(-ERANGE);
4206                         }
4207                         part_len = min(seg_len, len_to_track_end);
4208                         seg_len -= part_len;
4209                         dst += part_len;
4210                         idaw_len += part_len;
4211                         len_to_track_end -= part_len;
4212                         /* collected memory area ends on an IDA_BLOCK border,
4213                          * -> create an idaw
4214                          * idal_create_words will handle cases where idaw_len
4215                          * is larger then IDA_BLOCK_SIZE
4216                          */
4217                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
4218                                 end_idaw = 1;
4219                         /* We also need to end the idaw at track end */
4220                         if (!len_to_track_end) {
4221                                 new_track = 1;
4222                                 end_idaw = 1;
4223                         }
4224                         if (end_idaw) {
4225                                 idaws = idal_create_words(idaws, idaw_dst,
4226                                                           idaw_len);
4227                                 idaw_dst = NULL;
4228                                 idaw_len = 0;
4229                                 end_idaw = 0;
4230                         }
4231                 }
4232         }
4233
4234         if (blk_noretry_request(req) ||
4235             block->base->features & DASD_FEATURE_FAILFAST)
4236                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4237         cqr->startdev = startdev;
4238         cqr->memdev = startdev;
4239         cqr->block = block;
4240         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4241         cqr->lpm = dasd_path_get_ppm(startdev);
4242         cqr->retries = startdev->default_retries;
4243         cqr->buildclk = get_tod_clock();
4244         cqr->status = DASD_CQR_FILLED;
4245
4246         /* Set flags to suppress output for expected errors */
4247         if (dasd_eckd_is_ese(basedev))
4248                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4249
4250         return cqr;
4251 }
4252
4253 static int prepare_itcw(struct itcw *itcw,
4254                         unsigned int trk, unsigned int totrk, int cmd,
4255                         struct dasd_device *basedev,
4256                         struct dasd_device *startdev,
4257                         unsigned int rec_on_trk, int count,
4258                         unsigned int blksize,
4259                         unsigned int total_data_size,
4260                         unsigned int tlf,
4261                         unsigned int blk_per_trk)
4262 {
4263         struct PFX_eckd_data pfxdata;
4264         struct dasd_eckd_private *basepriv, *startpriv;
4265         struct DE_eckd_data *dedata;
4266         struct LRE_eckd_data *lredata;
4267         struct dcw *dcw;
4268
4269         u32 begcyl, endcyl;
4270         u16 heads, beghead, endhead;
4271         u8 pfx_cmd;
4272
4273         int rc = 0;
4274         int sector = 0;
4275         int dn, d;
4276
4277
4278         /* setup prefix data */
4279         basepriv = basedev->private;
4280         startpriv = startdev->private;
4281         dedata = &pfxdata.define_extent;
4282         lredata = &pfxdata.locate_record;
4283
4284         memset(&pfxdata, 0, sizeof(pfxdata));
4285         pfxdata.format = 1; /* PFX with LRE */
4286         pfxdata.base_address = basepriv->ned->unit_addr;
4287         pfxdata.base_lss = basepriv->ned->ID;
4288         pfxdata.validity.define_extent = 1;
4289
4290         /* private uid is kept up to date, conf_data may be outdated */
4291         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
4292                 pfxdata.validity.verify_base = 1;
4293
4294         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
4295                 pfxdata.validity.verify_base = 1;
4296                 pfxdata.validity.hyper_pav = 1;
4297         }
4298
4299         switch (cmd) {
4300         case DASD_ECKD_CCW_READ_TRACK_DATA:
4301                 dedata->mask.perm = 0x1;
4302                 dedata->attributes.operation = basepriv->attrib.operation;
4303                 dedata->blk_size = blksize;
4304                 dedata->ga_extended |= 0x42;
4305                 lredata->operation.orientation = 0x0;
4306                 lredata->operation.operation = 0x0C;
4307                 lredata->auxiliary.check_bytes = 0x01;
4308                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4309                 break;
4310         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
4311                 dedata->mask.perm = 0x02;
4312                 dedata->attributes.operation = basepriv->attrib.operation;
4313                 dedata->blk_size = blksize;
4314                 rc = set_timestamp(NULL, dedata, basedev);
4315                 dedata->ga_extended |= 0x42;
4316                 lredata->operation.orientation = 0x0;
4317                 lredata->operation.operation = 0x3F;
4318                 lredata->extended_operation = 0x23;
4319                 lredata->auxiliary.check_bytes = 0x2;
4320                 /*
4321                  * If XRC is supported the System Time Stamp is set. The
4322                  * validity of the time stamp must be reflected in the prefix
4323                  * data as well.
4324                  */
4325                 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
4326                         pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
4327                 pfx_cmd = DASD_ECKD_CCW_PFX;
4328                 break;
4329         case DASD_ECKD_CCW_READ_COUNT_MT:
4330                 dedata->mask.perm = 0x1;
4331                 dedata->attributes.operation = DASD_BYPASS_CACHE;
4332                 dedata->ga_extended |= 0x42;
4333                 dedata->blk_size = blksize;
4334                 lredata->operation.orientation = 0x2;
4335                 lredata->operation.operation = 0x16;
4336                 lredata->auxiliary.check_bytes = 0x01;
4337                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4338                 break;
4339         default:
4340                 DBF_DEV_EVENT(DBF_ERR, basedev,
4341                               "prepare itcw, unknown opcode 0x%x", cmd);
4342                 BUG();
4343                 break;
4344         }
4345         if (rc)
4346                 return rc;
4347
4348         dedata->attributes.mode = 0x3;  /* ECKD */
4349
4350         heads = basepriv->rdc_data.trk_per_cyl;
4351         begcyl = trk / heads;
4352         beghead = trk % heads;
4353         endcyl = totrk / heads;
4354         endhead = totrk % heads;
4355
4356         /* check for sequential prestage - enhance cylinder range */
4357         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
4358             dedata->attributes.operation == DASD_SEQ_ACCESS) {
4359
4360                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
4361                         endcyl += basepriv->attrib.nr_cyl;
4362                 else
4363                         endcyl = (basepriv->real_cyl - 1);
4364         }
4365
4366         set_ch_t(&dedata->beg_ext, begcyl, beghead);
4367         set_ch_t(&dedata->end_ext, endcyl, endhead);
4368
4369         dedata->ep_format = 0x20; /* records per track is valid */
4370         dedata->ep_rec_per_track = blk_per_trk;
4371
4372         if (rec_on_trk) {
4373                 switch (basepriv->rdc_data.dev_type) {
4374                 case 0x3390:
4375                         dn = ceil_quot(blksize + 6, 232);
4376                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
4377                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
4378                         break;
4379                 case 0x3380:
4380                         d = 7 + ceil_quot(blksize + 12, 32);
4381                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
4382                         break;
4383                 }
4384         }
4385
4386         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
4387                 lredata->auxiliary.length_valid = 0;
4388                 lredata->auxiliary.length_scope = 0;
4389                 lredata->sector = 0xff;
4390         } else {
4391                 lredata->auxiliary.length_valid = 1;
4392                 lredata->auxiliary.length_scope = 1;
4393                 lredata->sector = sector;
4394         }
4395         lredata->auxiliary.imbedded_ccw_valid = 1;
4396         lredata->length = tlf;
4397         lredata->imbedded_ccw = cmd;
4398         lredata->count = count;
4399         set_ch_t(&lredata->seek_addr, begcyl, beghead);
4400         lredata->search_arg.cyl = lredata->seek_addr.cyl;
4401         lredata->search_arg.head = lredata->seek_addr.head;
4402         lredata->search_arg.record = rec_on_trk;
4403
4404         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
4405                      &pfxdata, sizeof(pfxdata), total_data_size);
4406         return PTR_ERR_OR_ZERO(dcw);
4407 }
4408
4409 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
4410                                                struct dasd_device *startdev,
4411                                                struct dasd_block *block,
4412                                                struct request *req,
4413                                                sector_t first_rec,
4414                                                sector_t last_rec,
4415                                                sector_t first_trk,
4416                                                sector_t last_trk,
4417                                                unsigned int first_offs,
4418                                                unsigned int last_offs,
4419                                                unsigned int blk_per_trk,
4420                                                unsigned int blksize)
4421 {
4422         struct dasd_ccw_req *cqr;
4423         struct req_iterator iter;
4424         struct bio_vec bv;
4425         char *dst;
4426         unsigned int trkcount, ctidaw;
4427         unsigned char cmd;
4428         struct dasd_device *basedev;
4429         unsigned int tlf;
4430         struct itcw *itcw;
4431         struct tidaw *last_tidaw = NULL;
4432         int itcw_op;
4433         size_t itcw_size;
4434         u8 tidaw_flags;
4435         unsigned int seg_len, part_len, len_to_track_end;
4436         unsigned char new_track;
4437         sector_t recid, trkid;
4438         unsigned int offs;
4439         unsigned int count, count_to_trk_end;
4440         int ret;
4441
4442         basedev = block->base;
4443         if (rq_data_dir(req) == READ) {
4444                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4445                 itcw_op = ITCW_OP_READ;
4446         } else if (rq_data_dir(req) == WRITE) {
4447                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4448                 itcw_op = ITCW_OP_WRITE;
4449         } else
4450                 return ERR_PTR(-EINVAL);
4451
4452         /* trackbased I/O needs address all memory via TIDAWs,
4453          * not just for 64 bit addresses. This allows us to map
4454          * each segment directly to one tidaw.
4455          * In the case of write requests, additional tidaws may
4456          * be needed when a segment crosses a track boundary.
4457          */
4458         trkcount = last_trk - first_trk + 1;
4459         ctidaw = 0;
4460         rq_for_each_segment(bv, req, iter) {
4461                 ++ctidaw;
4462         }
4463         if (rq_data_dir(req) == WRITE)
4464                 ctidaw += (last_trk - first_trk);
4465
4466         /* Allocate the ccw request. */
4467         itcw_size = itcw_calc_size(0, ctidaw, 0);
4468         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
4469                                    blk_mq_rq_to_pdu(req));
4470         if (IS_ERR(cqr))
4471                 return cqr;
4472
4473         /* transfer length factor: how many bytes to read from the last track */
4474         if (first_trk == last_trk)
4475                 tlf = last_offs - first_offs + 1;
4476         else
4477                 tlf = last_offs + 1;
4478         tlf *= blksize;
4479
4480         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
4481         if (IS_ERR(itcw)) {
4482                 ret = -EINVAL;
4483                 goto out_error;
4484         }
4485         cqr->cpaddr = itcw_get_tcw(itcw);
4486         if (prepare_itcw(itcw, first_trk, last_trk,
4487                          cmd, basedev, startdev,
4488                          first_offs + 1,
4489                          trkcount, blksize,
4490                          (last_rec - first_rec + 1) * blksize,
4491                          tlf, blk_per_trk) == -EAGAIN) {
4492                 /* Clock not in sync and XRC is enabled.
4493                  * Try again later.
4494                  */
4495                 ret = -EAGAIN;
4496                 goto out_error;
4497         }
4498         len_to_track_end = 0;
4499         /*
4500          * A tidaw can address 4k of memory, but must not cross page boundaries
4501          * We can let the block layer handle this by setting
4502          * blk_queue_segment_boundary to page boundaries and
4503          * blk_max_segment_size to page size when setting up the request queue.
4504          * For write requests, a TIDAW must not cross track boundaries, because
4505          * we have to set the CBC flag on the last tidaw for each track.
4506          */
4507         if (rq_data_dir(req) == WRITE) {
4508                 new_track = 1;
4509                 recid = first_rec;
4510                 rq_for_each_segment(bv, req, iter) {
4511                         dst = page_address(bv.bv_page) + bv.bv_offset;
4512                         seg_len = bv.bv_len;
4513                         while (seg_len) {
4514                                 if (new_track) {
4515                                         trkid = recid;
4516                                         offs = sector_div(trkid, blk_per_trk);
4517                                         count_to_trk_end = blk_per_trk - offs;
4518                                         count = min((last_rec - recid + 1),
4519                                                     (sector_t)count_to_trk_end);
4520                                         len_to_track_end = count * blksize;
4521                                         recid += count;
4522                                         new_track = 0;
4523                                 }
4524                                 part_len = min(seg_len, len_to_track_end);
4525                                 seg_len -= part_len;
4526                                 len_to_track_end -= part_len;
4527                                 /* We need to end the tidaw at track end */
4528                                 if (!len_to_track_end) {
4529                                         new_track = 1;
4530                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
4531                                 } else
4532                                         tidaw_flags = 0;
4533                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
4534                                                             dst, part_len);
4535                                 if (IS_ERR(last_tidaw)) {
4536                                         ret = -EINVAL;
4537                                         goto out_error;
4538                                 }
4539                                 dst += part_len;
4540                         }
4541                 }
4542         } else {
4543                 rq_for_each_segment(bv, req, iter) {
4544                         dst = page_address(bv.bv_page) + bv.bv_offset;
4545                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
4546                                                     dst, bv.bv_len);
4547                         if (IS_ERR(last_tidaw)) {
4548                                 ret = -EINVAL;
4549                                 goto out_error;
4550                         }
4551                 }
4552         }
4553         last_tidaw->flags |= TIDAW_FLAGS_LAST;
4554         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
4555         itcw_finalize(itcw);
4556
4557         if (blk_noretry_request(req) ||
4558             block->base->features & DASD_FEATURE_FAILFAST)
4559                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4560         cqr->cpmode = 1;
4561         cqr->startdev = startdev;
4562         cqr->memdev = startdev;
4563         cqr->block = block;
4564         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4565         cqr->lpm = dasd_path_get_ppm(startdev);
4566         cqr->retries = startdev->default_retries;
4567         cqr->buildclk = get_tod_clock();
4568         cqr->status = DASD_CQR_FILLED;
4569
4570         /* Set flags to suppress output for expected errors */
4571         if (dasd_eckd_is_ese(basedev)) {
4572                 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4573                 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4574                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4575         }
4576
4577         return cqr;
4578 out_error:
4579         dasd_sfree_request(cqr, startdev);
4580         return ERR_PTR(ret);
4581 }
4582
4583 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
4584                                                struct dasd_block *block,
4585                                                struct request *req)
4586 {
4587         int cmdrtd, cmdwtd;
4588         int use_prefix;
4589         int fcx_multitrack;
4590         struct dasd_eckd_private *private;
4591         struct dasd_device *basedev;
4592         sector_t first_rec, last_rec;
4593         sector_t first_trk, last_trk;
4594         unsigned int first_offs, last_offs;
4595         unsigned int blk_per_trk, blksize;
4596         int cdlspecial;
4597         unsigned int data_size;
4598         struct dasd_ccw_req *cqr;
4599
4600         basedev = block->base;
4601         private = basedev->private;
4602
4603         /* Calculate number of blocks/records per track. */
4604         blksize = block->bp_block;
4605         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4606         if (blk_per_trk == 0)
4607                 return ERR_PTR(-EINVAL);
4608         /* Calculate record id of first and last block. */
4609         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
4610         first_offs = sector_div(first_trk, blk_per_trk);
4611         last_rec = last_trk =
4612                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
4613         last_offs = sector_div(last_trk, blk_per_trk);
4614         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
4615
4616         fcx_multitrack = private->features.feature[40] & 0x20;
4617         data_size = blk_rq_bytes(req);
4618         if (data_size % blksize)
4619                 return ERR_PTR(-EINVAL);
4620         /* tpm write request add CBC data on each track boundary */
4621         if (rq_data_dir(req) == WRITE)
4622                 data_size += (last_trk - first_trk) * 4;
4623
4624         /* is read track data and write track data in command mode supported? */
4625         cmdrtd = private->features.feature[9] & 0x20;
4626         cmdwtd = private->features.feature[12] & 0x40;
4627         use_prefix = private->features.feature[8] & 0x01;
4628
4629         cqr = NULL;
4630         if (cdlspecial || dasd_page_cache) {
4631                 /* do nothing, just fall through to the cmd mode single case */
4632         } else if ((data_size <= private->fcx_max_data)
4633                    && (fcx_multitrack || (first_trk == last_trk))) {
4634                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
4635                                                     first_rec, last_rec,
4636                                                     first_trk, last_trk,
4637                                                     first_offs, last_offs,
4638                                                     blk_per_trk, blksize);
4639                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4640                     (PTR_ERR(cqr) != -ENOMEM))
4641                         cqr = NULL;
4642         } else if (use_prefix &&
4643                    (((rq_data_dir(req) == READ) && cmdrtd) ||
4644                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
4645                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
4646                                                    first_rec, last_rec,
4647                                                    first_trk, last_trk,
4648                                                    first_offs, last_offs,
4649                                                    blk_per_trk, blksize);
4650                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4651                     (PTR_ERR(cqr) != -ENOMEM))
4652                         cqr = NULL;
4653         }
4654         if (!cqr)
4655                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
4656                                                     first_rec, last_rec,
4657                                                     first_trk, last_trk,
4658                                                     first_offs, last_offs,
4659                                                     blk_per_trk, blksize);
4660         return cqr;
4661 }
4662
4663 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
4664                                                    struct dasd_block *block,
4665                                                    struct request *req)
4666 {
4667         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
4668         unsigned int seg_len, len_to_track_end;
4669         unsigned int cidaw, cplength, datasize;
4670         sector_t first_trk, last_trk, sectors;
4671         struct dasd_eckd_private *base_priv;
4672         struct dasd_device *basedev;
4673         struct req_iterator iter;
4674         struct dasd_ccw_req *cqr;
4675         unsigned int first_offs;
4676         unsigned int trkcount;
4677         unsigned long *idaws;
4678         unsigned int size;
4679         unsigned char cmd;
4680         struct bio_vec bv;
4681         struct ccw1 *ccw;
4682         int use_prefix;
4683         void *data;
4684         char *dst;
4685
4686         /*
4687          * raw track access needs to be mutiple of 64k and on 64k boundary
4688          * For read requests we can fix an incorrect alignment by padding
4689          * the request with dummy pages.
4690          */
4691         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
4692         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
4693                 DASD_RAW_SECTORS_PER_TRACK;
4694         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
4695                 DASD_RAW_SECTORS_PER_TRACK;
4696         basedev = block->base;
4697         if ((start_padding_sectors || end_padding_sectors) &&
4698             (rq_data_dir(req) == WRITE)) {
4699                 DBF_DEV_EVENT(DBF_ERR, basedev,
4700                               "raw write not track aligned (%llu,%llu) req %p",
4701                               start_padding_sectors, end_padding_sectors, req);
4702                 return ERR_PTR(-EINVAL);
4703         }
4704
4705         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
4706         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
4707                 DASD_RAW_SECTORS_PER_TRACK;
4708         trkcount = last_trk - first_trk + 1;
4709         first_offs = 0;
4710
4711         if (rq_data_dir(req) == READ)
4712                 cmd = DASD_ECKD_CCW_READ_TRACK;
4713         else if (rq_data_dir(req) == WRITE)
4714                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
4715         else
4716                 return ERR_PTR(-EINVAL);
4717
4718         /*
4719          * Raw track based I/O needs IDAWs for each page,
4720          * and not just for 64 bit addresses.
4721          */
4722         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
4723
4724         /*
4725          * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
4726          * of extended parameter. This is needed for write full track.
4727          */
4728         base_priv = basedev->private;
4729         use_prefix = base_priv->features.feature[8] & 0x01;
4730         if (use_prefix) {
4731                 cplength = 1 + trkcount;
4732                 size = sizeof(struct PFX_eckd_data) + 2;
4733         } else {
4734                 cplength = 2 + trkcount;
4735                 size = sizeof(struct DE_eckd_data) +
4736                         sizeof(struct LRE_eckd_data) + 2;
4737         }
4738         size = ALIGN(size, 8);
4739
4740         datasize = size + cidaw * sizeof(unsigned long);
4741
4742         /* Allocate the ccw request. */
4743         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
4744                                    datasize, startdev, blk_mq_rq_to_pdu(req));
4745         if (IS_ERR(cqr))
4746                 return cqr;
4747
4748         ccw = cqr->cpaddr;
4749         data = cqr->data;
4750
4751         if (use_prefix) {
4752                 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
4753                            startdev, 1, first_offs + 1, trkcount, 0, 0);
4754         } else {
4755                 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
4756                 ccw[-1].flags |= CCW_FLAG_CC;
4757
4758                 data += sizeof(struct DE_eckd_data);
4759                 locate_record_ext(ccw++, data, first_trk, first_offs + 1,
4760                                   trkcount, cmd, basedev, 0, 0);
4761         }
4762
4763         idaws = (unsigned long *)(cqr->data + size);
4764         len_to_track_end = 0;
4765         if (start_padding_sectors) {
4766                 ccw[-1].flags |= CCW_FLAG_CC;
4767                 ccw->cmd_code = cmd;
4768                 /* maximum 3390 track size */
4769                 ccw->count = 57326;
4770                 /* 64k map to one track */
4771                 len_to_track_end = 65536 - start_padding_sectors * 512;
4772                 ccw->cda = (__u32)(addr_t)idaws;
4773                 ccw->flags |= CCW_FLAG_IDA;
4774                 ccw->flags |= CCW_FLAG_SLI;
4775                 ccw++;
4776                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
4777                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4778         }
4779         rq_for_each_segment(bv, req, iter) {
4780                 dst = page_address(bv.bv_page) + bv.bv_offset;
4781                 seg_len = bv.bv_len;
4782                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
4783                         memset(dst, 0, seg_len);
4784                 if (!len_to_track_end) {
4785                         ccw[-1].flags |= CCW_FLAG_CC;
4786                         ccw->cmd_code = cmd;
4787                         /* maximum 3390 track size */
4788                         ccw->count = 57326;
4789                         /* 64k map to one track */
4790                         len_to_track_end = 65536;
4791                         ccw->cda = (__u32)(addr_t)idaws;
4792                         ccw->flags |= CCW_FLAG_IDA;
4793                         ccw->flags |= CCW_FLAG_SLI;
4794                         ccw++;
4795                 }
4796                 len_to_track_end -= seg_len;
4797                 idaws = idal_create_words(idaws, dst, seg_len);
4798         }
4799         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
4800                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4801         if (blk_noretry_request(req) ||
4802             block->base->features & DASD_FEATURE_FAILFAST)
4803                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4804         cqr->startdev = startdev;
4805         cqr->memdev = startdev;
4806         cqr->block = block;
4807         cqr->expires = startdev->default_expires * HZ;
4808         cqr->lpm = dasd_path_get_ppm(startdev);
4809         cqr->retries = startdev->default_retries;
4810         cqr->buildclk = get_tod_clock();
4811         cqr->status = DASD_CQR_FILLED;
4812
4813         return cqr;
4814 }
4815
4816
4817 static int
4818 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
4819 {
4820         struct dasd_eckd_private *private;
4821         struct ccw1 *ccw;
4822         struct req_iterator iter;
4823         struct bio_vec bv;
4824         char *dst, *cda;
4825         unsigned int blksize, blk_per_trk, off;
4826         sector_t recid;
4827         int status;
4828
4829         if (!dasd_page_cache)
4830                 goto out;
4831         private = cqr->block->base->private;
4832         blksize = cqr->block->bp_block;
4833         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4834         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4835         ccw = cqr->cpaddr;
4836         /* Skip over define extent & locate record. */
4837         ccw++;
4838         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4839                 ccw++;
4840         rq_for_each_segment(bv, req, iter) {
4841                 dst = page_address(bv.bv_page) + bv.bv_offset;
4842                 for (off = 0; off < bv.bv_len; off += blksize) {
4843                         /* Skip locate record. */
4844                         if (private->uses_cdl && recid <= 2*blk_per_trk)
4845                                 ccw++;
4846                         if (dst) {
4847                                 if (ccw->flags & CCW_FLAG_IDA)
4848                                         cda = *((char **)((addr_t) ccw->cda));
4849                                 else
4850                                         cda = (char *)((addr_t) ccw->cda);
4851                                 if (dst != cda) {
4852                                         if (rq_data_dir(req) == READ)
4853                                                 memcpy(dst, cda, bv.bv_len);
4854                                         kmem_cache_free(dasd_page_cache,
4855                                             (void *)((addr_t)cda & PAGE_MASK));
4856                                 }
4857                                 dst = NULL;
4858                         }
4859                         ccw++;
4860                         recid++;
4861                 }
4862         }
4863 out:
4864         status = cqr->status == DASD_CQR_DONE;
4865         dasd_sfree_request(cqr, cqr->memdev);
4866         return status;
4867 }
4868
4869 /*
4870  * Modify ccw/tcw in cqr so it can be started on a base device.
4871  *
4872  * Note that this is not enough to restart the cqr!
4873  * Either reset cqr->startdev as well (summary unit check handling)
4874  * or restart via separate cqr (as in ERP handling).
4875  */
4876 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4877 {
4878         struct ccw1 *ccw;
4879         struct PFX_eckd_data *pfxdata;
4880         struct tcw *tcw;
4881         struct tccb *tccb;
4882         struct dcw *dcw;
4883
4884         if (cqr->cpmode == 1) {
4885                 tcw = cqr->cpaddr;
4886                 tccb = tcw_get_tccb(tcw);
4887                 dcw = (struct dcw *)&tccb->tca[0];
4888                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4889                 pfxdata->validity.verify_base = 0;
4890                 pfxdata->validity.hyper_pav = 0;
4891         } else {
4892                 ccw = cqr->cpaddr;
4893                 pfxdata = cqr->data;
4894                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4895                         pfxdata->validity.verify_base = 0;
4896                         pfxdata->validity.hyper_pav = 0;
4897                 }
4898         }
4899 }
4900
4901 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4902
4903 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4904                                                      struct dasd_block *block,
4905                                                      struct request *req)
4906 {
4907         struct dasd_eckd_private *private;
4908         struct dasd_device *startdev;
4909         unsigned long flags;
4910         struct dasd_ccw_req *cqr;
4911
4912         startdev = dasd_alias_get_start_dev(base);
4913         if (!startdev)
4914                 startdev = base;
4915         private = startdev->private;
4916         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4917                 return ERR_PTR(-EBUSY);
4918
4919         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4920         private->count++;
4921         if ((base->features & DASD_FEATURE_USERAW))
4922                 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4923         else
4924                 cqr = dasd_eckd_build_cp(startdev, block, req);
4925         if (IS_ERR(cqr))
4926                 private->count--;
4927         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4928         return cqr;
4929 }
4930
4931 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4932                                    struct request *req)
4933 {
4934         struct dasd_eckd_private *private;
4935         unsigned long flags;
4936
4937         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4938         private = cqr->memdev->private;
4939         private->count--;
4940         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4941         return dasd_eckd_free_cp(cqr, req);
4942 }
4943
4944 static int
4945 dasd_eckd_fill_info(struct dasd_device * device,
4946                     struct dasd_information2_t * info)
4947 {
4948         struct dasd_eckd_private *private = device->private;
4949
4950         info->label_block = 2;
4951         info->FBA_layout = private->uses_cdl ? 0 : 1;
4952         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4953         info->characteristics_size = sizeof(private->rdc_data);
4954         memcpy(info->characteristics, &private->rdc_data,
4955                sizeof(private->rdc_data));
4956         info->confdata_size = min((unsigned long)private->conf_len,
4957                                   sizeof(info->configuration_data));
4958         memcpy(info->configuration_data, private->conf_data,
4959                info->confdata_size);
4960         return 0;
4961 }
4962
4963 /*
4964  * SECTION: ioctl functions for eckd devices.
4965  */
4966
4967 /*
4968  * Release device ioctl.
4969  * Buils a channel programm to releases a prior reserved
4970  * (see dasd_eckd_reserve) device.
4971  */
4972 static int
4973 dasd_eckd_release(struct dasd_device *device)
4974 {
4975         struct dasd_ccw_req *cqr;
4976         int rc;
4977         struct ccw1 *ccw;
4978         int useglobal;
4979
4980         if (!capable(CAP_SYS_ADMIN))
4981                 return -EACCES;
4982
4983         useglobal = 0;
4984         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4985         if (IS_ERR(cqr)) {
4986                 mutex_lock(&dasd_reserve_mutex);
4987                 useglobal = 1;
4988                 cqr = &dasd_reserve_req->cqr;
4989                 memset(cqr, 0, sizeof(*cqr));
4990                 memset(&dasd_reserve_req->ccw, 0,
4991                        sizeof(dasd_reserve_req->ccw));
4992                 cqr->cpaddr = &dasd_reserve_req->ccw;
4993                 cqr->data = &dasd_reserve_req->data;
4994                 cqr->magic = DASD_ECKD_MAGIC;
4995         }
4996         ccw = cqr->cpaddr;
4997         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4998         ccw->flags |= CCW_FLAG_SLI;
4999         ccw->count = 32;
5000         ccw->cda = (__u32)(addr_t) cqr->data;
5001         cqr->startdev = device;
5002         cqr->memdev = device;
5003         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5004         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5005         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5006         cqr->expires = 2 * HZ;
5007         cqr->buildclk = get_tod_clock();
5008         cqr->status = DASD_CQR_FILLED;
5009
5010         rc = dasd_sleep_on_immediatly(cqr);
5011         if (!rc)
5012                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5013
5014         if (useglobal)
5015                 mutex_unlock(&dasd_reserve_mutex);
5016         else
5017                 dasd_sfree_request(cqr, cqr->memdev);
5018         return rc;
5019 }
5020
5021 /*
5022  * Reserve device ioctl.
5023  * Options are set to 'synchronous wait for interrupt' and
5024  * 'timeout the request'. This leads to a terminate IO if
5025  * the interrupt is outstanding for a certain time.
5026  */
5027 static int
5028 dasd_eckd_reserve(struct dasd_device *device)
5029 {
5030         struct dasd_ccw_req *cqr;
5031         int rc;
5032         struct ccw1 *ccw;
5033         int useglobal;
5034
5035         if (!capable(CAP_SYS_ADMIN))
5036                 return -EACCES;
5037
5038         useglobal = 0;
5039         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5040         if (IS_ERR(cqr)) {
5041                 mutex_lock(&dasd_reserve_mutex);
5042                 useglobal = 1;
5043                 cqr = &dasd_reserve_req->cqr;
5044                 memset(cqr, 0, sizeof(*cqr));
5045                 memset(&dasd_reserve_req->ccw, 0,
5046                        sizeof(dasd_reserve_req->ccw));
5047                 cqr->cpaddr = &dasd_reserve_req->ccw;
5048                 cqr->data = &dasd_reserve_req->data;
5049                 cqr->magic = DASD_ECKD_MAGIC;
5050         }
5051         ccw = cqr->cpaddr;
5052         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
5053         ccw->flags |= CCW_FLAG_SLI;
5054         ccw->count = 32;
5055         ccw->cda = (__u32)(addr_t) cqr->data;
5056         cqr->startdev = device;
5057         cqr->memdev = device;
5058         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5059         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5060         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5061         cqr->expires = 2 * HZ;
5062         cqr->buildclk = get_tod_clock();
5063         cqr->status = DASD_CQR_FILLED;
5064
5065         rc = dasd_sleep_on_immediatly(cqr);
5066         if (!rc)
5067                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5068
5069         if (useglobal)
5070                 mutex_unlock(&dasd_reserve_mutex);
5071         else
5072                 dasd_sfree_request(cqr, cqr->memdev);
5073         return rc;
5074 }
5075
5076 /*
5077  * Steal lock ioctl - unconditional reserve device.
5078  * Buils a channel programm to break a device's reservation.
5079  * (unconditional reserve)
5080  */
5081 static int
5082 dasd_eckd_steal_lock(struct dasd_device *device)
5083 {
5084         struct dasd_ccw_req *cqr;
5085         int rc;
5086         struct ccw1 *ccw;
5087         int useglobal;
5088
5089         if (!capable(CAP_SYS_ADMIN))
5090                 return -EACCES;
5091
5092         useglobal = 0;
5093         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5094         if (IS_ERR(cqr)) {
5095                 mutex_lock(&dasd_reserve_mutex);
5096                 useglobal = 1;
5097                 cqr = &dasd_reserve_req->cqr;
5098                 memset(cqr, 0, sizeof(*cqr));
5099                 memset(&dasd_reserve_req->ccw, 0,
5100                        sizeof(dasd_reserve_req->ccw));
5101                 cqr->cpaddr = &dasd_reserve_req->ccw;
5102                 cqr->data = &dasd_reserve_req->data;
5103                 cqr->magic = DASD_ECKD_MAGIC;
5104         }
5105         ccw = cqr->cpaddr;
5106         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
5107         ccw->flags |= CCW_FLAG_SLI;
5108         ccw->count = 32;
5109         ccw->cda = (__u32)(addr_t) cqr->data;
5110         cqr->startdev = device;
5111         cqr->memdev = device;
5112         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5113         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5114         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5115         cqr->expires = 2 * HZ;
5116         cqr->buildclk = get_tod_clock();
5117         cqr->status = DASD_CQR_FILLED;
5118
5119         rc = dasd_sleep_on_immediatly(cqr);
5120         if (!rc)
5121                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5122
5123         if (useglobal)
5124                 mutex_unlock(&dasd_reserve_mutex);
5125         else
5126                 dasd_sfree_request(cqr, cqr->memdev);
5127         return rc;
5128 }
5129
5130 /*
5131  * SNID - Sense Path Group ID
5132  * This ioctl may be used in situations where I/O is stalled due to
5133  * a reserve, so if the normal dasd_smalloc_request fails, we use the
5134  * preallocated dasd_reserve_req.
5135  */
5136 static int dasd_eckd_snid(struct dasd_device *device,
5137                           void __user *argp)
5138 {
5139         struct dasd_ccw_req *cqr;
5140         int rc;
5141         struct ccw1 *ccw;
5142         int useglobal;
5143         struct dasd_snid_ioctl_data usrparm;
5144
5145         if (!capable(CAP_SYS_ADMIN))
5146                 return -EACCES;
5147
5148         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5149                 return -EFAULT;
5150
5151         useglobal = 0;
5152         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
5153                                    sizeof(struct dasd_snid_data), device,
5154                                    NULL);
5155         if (IS_ERR(cqr)) {
5156                 mutex_lock(&dasd_reserve_mutex);
5157                 useglobal = 1;
5158                 cqr = &dasd_reserve_req->cqr;
5159                 memset(cqr, 0, sizeof(*cqr));
5160                 memset(&dasd_reserve_req->ccw, 0,
5161                        sizeof(dasd_reserve_req->ccw));
5162                 cqr->cpaddr = &dasd_reserve_req->ccw;
5163                 cqr->data = &dasd_reserve_req->data;
5164                 cqr->magic = DASD_ECKD_MAGIC;
5165         }
5166         ccw = cqr->cpaddr;
5167         ccw->cmd_code = DASD_ECKD_CCW_SNID;
5168         ccw->flags |= CCW_FLAG_SLI;
5169         ccw->count = 12;
5170         ccw->cda = (__u32)(addr_t) cqr->data;
5171         cqr->startdev = device;
5172         cqr->memdev = device;
5173         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5174         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5175         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
5176         cqr->retries = 5;
5177         cqr->expires = 10 * HZ;
5178         cqr->buildclk = get_tod_clock();
5179         cqr->status = DASD_CQR_FILLED;
5180         cqr->lpm = usrparm.path_mask;
5181
5182         rc = dasd_sleep_on_immediatly(cqr);
5183         /* verify that I/O processing didn't modify the path mask */
5184         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
5185                 rc = -EIO;
5186         if (!rc) {
5187                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
5188                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
5189                         rc = -EFAULT;
5190         }
5191
5192         if (useglobal)
5193                 mutex_unlock(&dasd_reserve_mutex);
5194         else
5195                 dasd_sfree_request(cqr, cqr->memdev);
5196         return rc;
5197 }
5198
5199 /*
5200  * Read performance statistics
5201  */
5202 static int
5203 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
5204 {
5205         struct dasd_psf_prssd_data *prssdp;
5206         struct dasd_rssd_perf_stats_t *stats;
5207         struct dasd_ccw_req *cqr;
5208         struct ccw1 *ccw;
5209         int rc;
5210
5211         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
5212                                    (sizeof(struct dasd_psf_prssd_data) +
5213                                     sizeof(struct dasd_rssd_perf_stats_t)),
5214                                    device, NULL);
5215         if (IS_ERR(cqr)) {
5216                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5217                             "Could not allocate initialization request");
5218                 return PTR_ERR(cqr);
5219         }
5220         cqr->startdev = device;
5221         cqr->memdev = device;
5222         cqr->retries = 0;
5223         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5224         cqr->expires = 10 * HZ;
5225
5226         /* Prepare for Read Subsystem Data */
5227         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5228         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5229         prssdp->order = PSF_ORDER_PRSSD;
5230         prssdp->suborder = 0x01;        /* Performance Statistics */
5231         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
5232
5233         ccw = cqr->cpaddr;
5234         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5235         ccw->count = sizeof(struct dasd_psf_prssd_data);
5236         ccw->flags |= CCW_FLAG_CC;
5237         ccw->cda = (__u32)(addr_t) prssdp;
5238
5239         /* Read Subsystem Data - Performance Statistics */
5240         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5241         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
5242
5243         ccw++;
5244         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5245         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
5246         ccw->cda = (__u32)(addr_t) stats;
5247
5248         cqr->buildclk = get_tod_clock();
5249         cqr->status = DASD_CQR_FILLED;
5250         rc = dasd_sleep_on(cqr);
5251         if (rc == 0) {
5252                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5253                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5254                 if (copy_to_user(argp, stats,
5255                                  sizeof(struct dasd_rssd_perf_stats_t)))
5256                         rc = -EFAULT;
5257         }
5258         dasd_sfree_request(cqr, cqr->memdev);
5259         return rc;
5260 }
5261
5262 /*
5263  * Get attributes (cache operations)
5264  * Returnes the cache attributes used in Define Extend (DE).
5265  */
5266 static int
5267 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
5268 {
5269         struct dasd_eckd_private *private = device->private;
5270         struct attrib_data_t attrib = private->attrib;
5271         int rc;
5272
5273         if (!capable(CAP_SYS_ADMIN))
5274                 return -EACCES;
5275         if (!argp)
5276                 return -EINVAL;
5277
5278         rc = 0;
5279         if (copy_to_user(argp, (long *) &attrib,
5280                          sizeof(struct attrib_data_t)))
5281                 rc = -EFAULT;
5282
5283         return rc;
5284 }
5285
5286 /*
5287  * Set attributes (cache operations)
5288  * Stores the attributes for cache operation to be used in Define Extend (DE).
5289  */
5290 static int
5291 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
5292 {
5293         struct dasd_eckd_private *private = device->private;
5294         struct attrib_data_t attrib;
5295
5296         if (!capable(CAP_SYS_ADMIN))
5297                 return -EACCES;
5298         if (!argp)
5299                 return -EINVAL;
5300
5301         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
5302                 return -EFAULT;
5303         private->attrib = attrib;
5304
5305         dev_info(&device->cdev->dev,
5306                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
5307                  private->attrib.operation, private->attrib.nr_cyl);
5308         return 0;
5309 }
5310
5311 /*
5312  * Issue syscall I/O to EMC Symmetrix array.
5313  * CCWs are PSF and RSSD
5314  */
5315 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
5316 {
5317         struct dasd_symmio_parms usrparm;
5318         char *psf_data, *rssd_result;
5319         struct dasd_ccw_req *cqr;
5320         struct ccw1 *ccw;
5321         char psf0, psf1;
5322         int rc;
5323
5324         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
5325                 return -EACCES;
5326         psf0 = psf1 = 0;
5327
5328         /* Copy parms from caller */
5329         rc = -EFAULT;
5330         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5331                 goto out;
5332         if (is_compat_task()) {
5333                 /* Make sure pointers are sane even on 31 bit. */
5334                 rc = -EINVAL;
5335                 if ((usrparm.psf_data >> 32) != 0)
5336                         goto out;
5337                 if ((usrparm.rssd_result >> 32) != 0)
5338                         goto out;
5339                 usrparm.psf_data &= 0x7fffffffULL;
5340                 usrparm.rssd_result &= 0x7fffffffULL;
5341         }
5342         /* at least 2 bytes are accessed and should be allocated */
5343         if (usrparm.psf_data_len < 2) {
5344                 DBF_DEV_EVENT(DBF_WARNING, device,
5345                               "Symmetrix ioctl invalid data length %d",
5346                               usrparm.psf_data_len);
5347                 rc = -EINVAL;
5348                 goto out;
5349         }
5350         /* alloc I/O data area */
5351         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
5352         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
5353         if (!psf_data || !rssd_result) {
5354                 rc = -ENOMEM;
5355                 goto out_free;
5356         }
5357
5358         /* get syscall header from user space */
5359         rc = -EFAULT;
5360         if (copy_from_user(psf_data,
5361                            (void __user *)(unsigned long) usrparm.psf_data,
5362                            usrparm.psf_data_len))
5363                 goto out_free;
5364         psf0 = psf_data[0];
5365         psf1 = psf_data[1];
5366
5367         /* setup CCWs for PSF + RSSD */
5368         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
5369         if (IS_ERR(cqr)) {
5370                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5371                         "Could not allocate initialization request");
5372                 rc = PTR_ERR(cqr);
5373                 goto out_free;
5374         }
5375
5376         cqr->startdev = device;
5377         cqr->memdev = device;
5378         cqr->retries = 3;
5379         cqr->expires = 10 * HZ;
5380         cqr->buildclk = get_tod_clock();
5381         cqr->status = DASD_CQR_FILLED;
5382
5383         /* Build the ccws */
5384         ccw = cqr->cpaddr;
5385
5386         /* PSF ccw */
5387         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5388         ccw->count = usrparm.psf_data_len;
5389         ccw->flags |= CCW_FLAG_CC;
5390         ccw->cda = (__u32)(addr_t) psf_data;
5391
5392         ccw++;
5393
5394         /* RSSD ccw  */
5395         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5396         ccw->count = usrparm.rssd_result_len;
5397         ccw->flags = CCW_FLAG_SLI ;
5398         ccw->cda = (__u32)(addr_t) rssd_result;
5399
5400         rc = dasd_sleep_on(cqr);
5401         if (rc)
5402                 goto out_sfree;
5403
5404         rc = -EFAULT;
5405         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
5406                            rssd_result, usrparm.rssd_result_len))
5407                 goto out_sfree;
5408         rc = 0;
5409
5410 out_sfree:
5411         dasd_sfree_request(cqr, cqr->memdev);
5412 out_free:
5413         kfree(rssd_result);
5414         kfree(psf_data);
5415 out:
5416         DBF_DEV_EVENT(DBF_WARNING, device,
5417                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
5418                       (int) psf0, (int) psf1, rc);
5419         return rc;
5420 }
5421
5422 static int
5423 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
5424 {
5425         struct dasd_device *device = block->base;
5426
5427         switch (cmd) {
5428         case BIODASDGATTR:
5429                 return dasd_eckd_get_attrib(device, argp);
5430         case BIODASDSATTR:
5431                 return dasd_eckd_set_attrib(device, argp);
5432         case BIODASDPSRD:
5433                 return dasd_eckd_performance(device, argp);
5434         case BIODASDRLSE:
5435                 return dasd_eckd_release(device);
5436         case BIODASDRSRV:
5437                 return dasd_eckd_reserve(device);
5438         case BIODASDSLCK:
5439                 return dasd_eckd_steal_lock(device);
5440         case BIODASDSNID:
5441                 return dasd_eckd_snid(device, argp);
5442         case BIODASDSYMMIO:
5443                 return dasd_symm_io(device, argp);
5444         default:
5445                 return -ENOTTY;
5446         }
5447 }
5448
5449 /*
5450  * Dump the range of CCWs into 'page' buffer
5451  * and return number of printed chars.
5452  */
5453 static int
5454 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
5455 {
5456         int len, count;
5457         char *datap;
5458
5459         len = 0;
5460         while (from <= to) {
5461                 len += sprintf(page + len, PRINTK_HEADER
5462                                " CCW %p: %08X %08X DAT:",
5463                                from, ((int *) from)[0], ((int *) from)[1]);
5464
5465                 /* get pointer to data (consider IDALs) */
5466                 if (from->flags & CCW_FLAG_IDA)
5467                         datap = (char *) *((addr_t *) (addr_t) from->cda);
5468                 else
5469                         datap = (char *) ((addr_t) from->cda);
5470
5471                 /* dump data (max 32 bytes) */
5472                 for (count = 0; count < from->count && count < 32; count++) {
5473                         if (count % 8 == 0) len += sprintf(page + len, " ");
5474                         if (count % 4 == 0) len += sprintf(page + len, " ");
5475                         len += sprintf(page + len, "%02x", datap[count]);
5476                 }
5477                 len += sprintf(page + len, "\n");
5478                 from++;
5479         }
5480         return len;
5481 }
5482
5483 static void
5484 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
5485                          char *reason)
5486 {
5487         u64 *sense;
5488         u64 *stat;
5489
5490         sense = (u64 *) dasd_get_sense(irb);
5491         stat = (u64 *) &irb->scsw;
5492         if (sense) {
5493                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
5494                               "%016llx %016llx %016llx %016llx",
5495                               reason, *stat, *((u32 *) (stat + 1)),
5496                               sense[0], sense[1], sense[2], sense[3]);
5497         } else {
5498                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
5499                               reason, *stat, *((u32 *) (stat + 1)),
5500                               "NO VALID SENSE");
5501         }
5502 }
5503
5504 /*
5505  * Print sense data and related channel program.
5506  * Parts are printed because printk buffer is only 1024 bytes.
5507  */
5508 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
5509                                  struct dasd_ccw_req *req, struct irb *irb)
5510 {
5511         char *page;
5512         struct ccw1 *first, *last, *fail, *from, *to;
5513         int len, sl, sct;
5514
5515         page = (char *) get_zeroed_page(GFP_ATOMIC);
5516         if (page == NULL) {
5517                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5518                               "No memory to dump sense data\n");
5519                 return;
5520         }
5521         /* dump the sense data */
5522         len = sprintf(page, PRINTK_HEADER
5523                       " I/O status report for device %s:\n",
5524                       dev_name(&device->cdev->dev));
5525         len += sprintf(page + len, PRINTK_HEADER
5526                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5527                        "CS:%02X RC:%d\n",
5528                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5529                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5530                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5531                        req ? req->intrc : 0);
5532         len += sprintf(page + len, PRINTK_HEADER
5533                        " device %s: Failing CCW: %p\n",
5534                        dev_name(&device->cdev->dev),
5535                        (void *) (addr_t) irb->scsw.cmd.cpa);
5536         if (irb->esw.esw0.erw.cons) {
5537                 for (sl = 0; sl < 4; sl++) {
5538                         len += sprintf(page + len, PRINTK_HEADER
5539                                        " Sense(hex) %2d-%2d:",
5540                                        (8 * sl), ((8 * sl) + 7));
5541
5542                         for (sct = 0; sct < 8; sct++) {
5543                                 len += sprintf(page + len, " %02x",
5544                                                irb->ecw[8 * sl + sct]);
5545                         }
5546                         len += sprintf(page + len, "\n");
5547                 }
5548
5549                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
5550                         /* 24 Byte Sense Data */
5551                         sprintf(page + len, PRINTK_HEADER
5552                                 " 24 Byte: %x MSG %x, "
5553                                 "%s MSGb to SYSOP\n",
5554                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
5555                                 irb->ecw[1] & 0x10 ? "" : "no");
5556                 } else {
5557                         /* 32 Byte Sense Data */
5558                         sprintf(page + len, PRINTK_HEADER
5559                                 " 32 Byte: Format: %x "
5560                                 "Exception class %x\n",
5561                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
5562                 }
5563         } else {
5564                 sprintf(page + len, PRINTK_HEADER
5565                         " SORRY - NO VALID SENSE AVAILABLE\n");
5566         }
5567         printk(KERN_ERR "%s", page);
5568
5569         if (req) {
5570                 /* req == NULL for unsolicited interrupts */
5571                 /* dump the Channel Program (max 140 Bytes per line) */
5572                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
5573                 first = req->cpaddr;
5574                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
5575                 to = min(first + 6, last);
5576                 len = sprintf(page, PRINTK_HEADER
5577                               " Related CP in req: %p\n", req);
5578                 dasd_eckd_dump_ccw_range(first, to, page + len);
5579                 printk(KERN_ERR "%s", page);
5580
5581                 /* print failing CCW area (maximum 4) */
5582                 /* scsw->cda is either valid or zero  */
5583                 len = 0;
5584                 from = ++to;
5585                 fail = (struct ccw1 *)(addr_t)
5586                                 irb->scsw.cmd.cpa; /* failing CCW */
5587                 if (from <  fail - 2) {
5588                         from = fail - 2;     /* there is a gap - print header */
5589                         len += sprintf(page, PRINTK_HEADER "......\n");
5590                 }
5591                 to = min(fail + 1, last);
5592                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
5593
5594                 /* print last CCWs (maximum 2) */
5595                 from = max(from, ++to);
5596                 if (from < last - 1) {
5597                         from = last - 1;     /* there is a gap - print header */
5598                         len += sprintf(page + len, PRINTK_HEADER "......\n");
5599                 }
5600                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
5601                 if (len > 0)
5602                         printk(KERN_ERR "%s", page);
5603         }
5604         free_page((unsigned long) page);
5605 }
5606
5607
5608 /*
5609  * Print sense data from a tcw.
5610  */
5611 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
5612                                  struct dasd_ccw_req *req, struct irb *irb)
5613 {
5614         char *page;
5615         int len, sl, sct, residual;
5616         struct tsb *tsb;
5617         u8 *sense, *rcq;
5618
5619         page = (char *) get_zeroed_page(GFP_ATOMIC);
5620         if (page == NULL) {
5621                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
5622                             "No memory to dump sense data");
5623                 return;
5624         }
5625         /* dump the sense data */
5626         len = sprintf(page, PRINTK_HEADER
5627                       " I/O status report for device %s:\n",
5628                       dev_name(&device->cdev->dev));
5629         len += sprintf(page + len, PRINTK_HEADER
5630                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5631                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
5632                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5633                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5634                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5635                        irb->scsw.tm.fcxs,
5636                        (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
5637                        req ? req->intrc : 0);
5638         len += sprintf(page + len, PRINTK_HEADER
5639                        " device %s: Failing TCW: %p\n",
5640                        dev_name(&device->cdev->dev),
5641                        (void *) (addr_t) irb->scsw.tm.tcw);
5642
5643         tsb = NULL;
5644         sense = NULL;
5645         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
5646                 tsb = tcw_get_tsb(
5647                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
5648
5649         if (tsb) {
5650                 len += sprintf(page + len, PRINTK_HEADER
5651                                " tsb->length %d\n", tsb->length);
5652                 len += sprintf(page + len, PRINTK_HEADER
5653                                " tsb->flags %x\n", tsb->flags);
5654                 len += sprintf(page + len, PRINTK_HEADER
5655                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
5656                 len += sprintf(page + len, PRINTK_HEADER
5657                                " tsb->count %d\n", tsb->count);
5658                 residual = tsb->count - 28;
5659                 len += sprintf(page + len, PRINTK_HEADER
5660                                " residual %d\n", residual);
5661
5662                 switch (tsb->flags & 0x07) {
5663                 case 1: /* tsa_iostat */
5664                         len += sprintf(page + len, PRINTK_HEADER
5665                                " tsb->tsa.iostat.dev_time %d\n",
5666                                        tsb->tsa.iostat.dev_time);
5667                         len += sprintf(page + len, PRINTK_HEADER
5668                                " tsb->tsa.iostat.def_time %d\n",
5669                                        tsb->tsa.iostat.def_time);
5670                         len += sprintf(page + len, PRINTK_HEADER
5671                                " tsb->tsa.iostat.queue_time %d\n",
5672                                        tsb->tsa.iostat.queue_time);
5673                         len += sprintf(page + len, PRINTK_HEADER
5674                                " tsb->tsa.iostat.dev_busy_time %d\n",
5675                                        tsb->tsa.iostat.dev_busy_time);
5676                         len += sprintf(page + len, PRINTK_HEADER
5677                                " tsb->tsa.iostat.dev_act_time %d\n",
5678                                        tsb->tsa.iostat.dev_act_time);
5679                         sense = tsb->tsa.iostat.sense;
5680                         break;
5681                 case 2: /* ts_ddpc */
5682                         len += sprintf(page + len, PRINTK_HEADER
5683                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
5684                         for (sl = 0; sl < 2; sl++) {
5685                                 len += sprintf(page + len, PRINTK_HEADER
5686                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
5687                                                (8 * sl), ((8 * sl) + 7));
5688                                 rcq = tsb->tsa.ddpc.rcq;
5689                                 for (sct = 0; sct < 8; sct++) {
5690                                         len += sprintf(page + len, " %02x",
5691                                                        rcq[8 * sl + sct]);
5692                                 }
5693                                 len += sprintf(page + len, "\n");
5694                         }
5695                         sense = tsb->tsa.ddpc.sense;
5696                         break;
5697                 case 3: /* tsa_intrg */
5698                         len += sprintf(page + len, PRINTK_HEADER
5699                                       " tsb->tsa.intrg.: not supported yet\n");
5700                         break;
5701                 }
5702
5703                 if (sense) {
5704                         for (sl = 0; sl < 4; sl++) {
5705                                 len += sprintf(page + len, PRINTK_HEADER
5706                                                " Sense(hex) %2d-%2d:",
5707                                                (8 * sl), ((8 * sl) + 7));
5708                                 for (sct = 0; sct < 8; sct++) {
5709                                         len += sprintf(page + len, " %02x",
5710                                                        sense[8 * sl + sct]);
5711                                 }
5712                                 len += sprintf(page + len, "\n");
5713                         }
5714
5715                         if (sense[27] & DASD_SENSE_BIT_0) {
5716                                 /* 24 Byte Sense Data */
5717                                 sprintf(page + len, PRINTK_HEADER
5718                                         " 24 Byte: %x MSG %x, "
5719                                         "%s MSGb to SYSOP\n",
5720                                         sense[7] >> 4, sense[7] & 0x0f,
5721                                         sense[1] & 0x10 ? "" : "no");
5722                         } else {
5723                                 /* 32 Byte Sense Data */
5724                                 sprintf(page + len, PRINTK_HEADER
5725                                         " 32 Byte: Format: %x "
5726                                         "Exception class %x\n",
5727                                         sense[6] & 0x0f, sense[22] >> 4);
5728                         }
5729                 } else {
5730                         sprintf(page + len, PRINTK_HEADER
5731                                 " SORRY - NO VALID SENSE AVAILABLE\n");
5732                 }
5733         } else {
5734                 sprintf(page + len, PRINTK_HEADER
5735                         " SORRY - NO TSB DATA AVAILABLE\n");
5736         }
5737         printk(KERN_ERR "%s", page);
5738         free_page((unsigned long) page);
5739 }
5740
5741 static void dasd_eckd_dump_sense(struct dasd_device *device,
5742                                  struct dasd_ccw_req *req, struct irb *irb)
5743 {
5744         u8 *sense = dasd_get_sense(irb);
5745
5746         if (scsw_is_tm(&irb->scsw)) {
5747                 /*
5748                  * In some cases the 'File Protected' or 'Incorrect Length'
5749                  * error might be expected and log messages shouldn't be written
5750                  * then. Check if the according suppress bit is set.
5751                  */
5752                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
5753                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
5754                         return;
5755                 if (scsw_cstat(&irb->scsw) == 0x40 &&
5756                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
5757                         return;
5758
5759                 dasd_eckd_dump_sense_tcw(device, req, irb);
5760         } else {
5761                 /*
5762                  * In some cases the 'Command Reject' or 'No Record Found'
5763                  * error might be expected and log messages shouldn't be
5764                  * written then. Check if the according suppress bit is set.
5765                  */
5766                 if (sense && sense[0] & SNS0_CMD_REJECT &&
5767                     test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
5768                         return;
5769
5770                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
5771                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
5772                         return;
5773
5774                 dasd_eckd_dump_sense_ccw(device, req, irb);
5775         }
5776 }
5777
5778 static int dasd_eckd_reload_device(struct dasd_device *device)
5779 {
5780         struct dasd_eckd_private *private = device->private;
5781         int rc, old_base;
5782         char print_uid[60];
5783         struct dasd_uid uid;
5784         unsigned long flags;
5785
5786         /*
5787          * remove device from alias handling to prevent new requests
5788          * from being scheduled on the wrong alias device
5789          */
5790         dasd_alias_remove_device(device);
5791
5792         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5793         old_base = private->uid.base_unit_addr;
5794         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5795
5796         /* Read Configuration Data */
5797         rc = dasd_eckd_read_conf(device);
5798         if (rc)
5799                 goto out_err;
5800
5801         rc = dasd_eckd_generate_uid(device);
5802         if (rc)
5803                 goto out_err;
5804         /*
5805          * update unit address configuration and
5806          * add device to alias management
5807          */
5808         dasd_alias_update_add_device(device);
5809
5810         dasd_eckd_get_uid(device, &uid);
5811
5812         if (old_base != uid.base_unit_addr) {
5813                 if (strlen(uid.vduit) > 0)
5814                         snprintf(print_uid, sizeof(print_uid),
5815                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5816                                  uid.ssid, uid.base_unit_addr, uid.vduit);
5817                 else
5818                         snprintf(print_uid, sizeof(print_uid),
5819                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5820                                  uid.ssid, uid.base_unit_addr);
5821
5822                 dev_info(&device->cdev->dev,
5823                          "An Alias device was reassigned to a new base device "
5824                          "with UID: %s\n", print_uid);
5825         }
5826         return 0;
5827
5828 out_err:
5829         return -1;
5830 }
5831
5832 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5833                                          struct dasd_rssd_messages *messages,
5834                                          __u8 lpum)
5835 {
5836         struct dasd_rssd_messages *message_buf;
5837         struct dasd_psf_prssd_data *prssdp;
5838         struct dasd_ccw_req *cqr;
5839         struct ccw1 *ccw;
5840         int rc;
5841
5842         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5843                                    (sizeof(struct dasd_psf_prssd_data) +
5844                                     sizeof(struct dasd_rssd_messages)),
5845                                    device, NULL);
5846         if (IS_ERR(cqr)) {
5847                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5848                                 "Could not allocate read message buffer request");
5849                 return PTR_ERR(cqr);
5850         }
5851
5852         cqr->lpm = lpum;
5853 retry:
5854         cqr->startdev = device;
5855         cqr->memdev = device;
5856         cqr->block = NULL;
5857         cqr->expires = 10 * HZ;
5858         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5859         /* dasd_sleep_on_immediatly does not do complex error
5860          * recovery so clear erp flag and set retry counter to
5861          * do basic erp */
5862         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5863         cqr->retries = 256;
5864
5865         /* Prepare for Read Subsystem Data */
5866         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5867         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5868         prssdp->order = PSF_ORDER_PRSSD;
5869         prssdp->suborder = 0x03;        /* Message Buffer */
5870         /* all other bytes of prssdp must be zero */
5871
5872         ccw = cqr->cpaddr;
5873         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5874         ccw->count = sizeof(struct dasd_psf_prssd_data);
5875         ccw->flags |= CCW_FLAG_CC;
5876         ccw->flags |= CCW_FLAG_SLI;
5877         ccw->cda = (__u32)(addr_t) prssdp;
5878
5879         /* Read Subsystem Data - message buffer */
5880         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5881         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5882
5883         ccw++;
5884         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5885         ccw->count = sizeof(struct dasd_rssd_messages);
5886         ccw->flags |= CCW_FLAG_SLI;
5887         ccw->cda = (__u32)(addr_t) message_buf;
5888
5889         cqr->buildclk = get_tod_clock();
5890         cqr->status = DASD_CQR_FILLED;
5891         rc = dasd_sleep_on_immediatly(cqr);
5892         if (rc == 0) {
5893                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5894                 message_buf = (struct dasd_rssd_messages *)
5895                         (prssdp + 1);
5896                 memcpy(messages, message_buf,
5897                        sizeof(struct dasd_rssd_messages));
5898         } else if (cqr->lpm) {
5899                 /*
5900                  * on z/VM we might not be able to do I/O on the requested path
5901                  * but instead we get the required information on any path
5902                  * so retry with open path mask
5903                  */
5904                 cqr->lpm = 0;
5905                 goto retry;
5906         } else
5907                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5908                                 "Reading messages failed with rc=%d\n"
5909                                 , rc);
5910         dasd_sfree_request(cqr, cqr->memdev);
5911         return rc;
5912 }
5913
5914 static int dasd_eckd_query_host_access(struct dasd_device *device,
5915                                        struct dasd_psf_query_host_access *data)
5916 {
5917         struct dasd_eckd_private *private = device->private;
5918         struct dasd_psf_query_host_access *host_access;
5919         struct dasd_psf_prssd_data *prssdp;
5920         struct dasd_ccw_req *cqr;
5921         struct ccw1 *ccw;
5922         int rc;
5923
5924         /* not available for HYPER PAV alias devices */
5925         if (!device->block && private->lcu->pav == HYPER_PAV)
5926                 return -EOPNOTSUPP;
5927
5928         /* may not be supported by the storage server */
5929         if (!(private->features.feature[14] & 0x80))
5930                 return -EOPNOTSUPP;
5931
5932         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5933                                    sizeof(struct dasd_psf_prssd_data) + 1,
5934                                    device, NULL);
5935         if (IS_ERR(cqr)) {
5936                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5937                                 "Could not allocate read message buffer request");
5938                 return PTR_ERR(cqr);
5939         }
5940         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5941         if (!host_access) {
5942                 dasd_sfree_request(cqr, device);
5943                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5944                                 "Could not allocate host_access buffer");
5945                 return -ENOMEM;
5946         }
5947         cqr->startdev = device;
5948         cqr->memdev = device;
5949         cqr->block = NULL;
5950         cqr->retries = 256;
5951         cqr->expires = 10 * HZ;
5952
5953         /* Prepare for Read Subsystem Data */
5954         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5955         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5956         prssdp->order = PSF_ORDER_PRSSD;
5957         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5958         /* LSS and Volume that will be queried */
5959         prssdp->lss = private->ned->ID;
5960         prssdp->volume = private->ned->unit_addr;
5961         /* all other bytes of prssdp must be zero */
5962
5963         ccw = cqr->cpaddr;
5964         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5965         ccw->count = sizeof(struct dasd_psf_prssd_data);
5966         ccw->flags |= CCW_FLAG_CC;
5967         ccw->flags |= CCW_FLAG_SLI;
5968         ccw->cda = (__u32)(addr_t) prssdp;
5969
5970         /* Read Subsystem Data - query host access */
5971         ccw++;
5972         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5973         ccw->count = sizeof(struct dasd_psf_query_host_access);
5974         ccw->flags |= CCW_FLAG_SLI;
5975         ccw->cda = (__u32)(addr_t) host_access;
5976
5977         cqr->buildclk = get_tod_clock();
5978         cqr->status = DASD_CQR_FILLED;
5979         /* the command might not be supported, suppress error message */
5980         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5981         rc = dasd_sleep_on_interruptible(cqr);
5982         if (rc == 0) {
5983                 *data = *host_access;
5984         } else {
5985                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5986                                 "Reading host access data failed with rc=%d\n",
5987                                 rc);
5988                 rc = -EOPNOTSUPP;
5989         }
5990
5991         dasd_sfree_request(cqr, cqr->memdev);
5992         kfree(host_access);
5993         return rc;
5994 }
5995 /*
5996  * return number of grouped devices
5997  */
5998 static int dasd_eckd_host_access_count(struct dasd_device *device)
5999 {
6000         struct dasd_psf_query_host_access *access;
6001         struct dasd_ckd_path_group_entry *entry;
6002         struct dasd_ckd_host_information *info;
6003         int count = 0;
6004         int rc, i;
6005
6006         access = kzalloc(sizeof(*access), GFP_NOIO);
6007         if (!access) {
6008                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6009                                 "Could not allocate access buffer");
6010                 return -ENOMEM;
6011         }
6012         rc = dasd_eckd_query_host_access(device, access);
6013         if (rc) {
6014                 kfree(access);
6015                 return rc;
6016         }
6017
6018         info = (struct dasd_ckd_host_information *)
6019                 access->host_access_information;
6020         for (i = 0; i < info->entry_count; i++) {
6021                 entry = (struct dasd_ckd_path_group_entry *)
6022                         (info->entry + i * info->entry_size);
6023                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
6024                         count++;
6025         }
6026
6027         kfree(access);
6028         return count;
6029 }
6030
6031 /*
6032  * write host access information to a sequential file
6033  */
6034 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
6035 {
6036         struct dasd_psf_query_host_access *access;
6037         struct dasd_ckd_path_group_entry *entry;
6038         struct dasd_ckd_host_information *info;
6039         char sysplex[9] = "";
6040         int rc, i;
6041
6042         access = kzalloc(sizeof(*access), GFP_NOIO);
6043         if (!access) {
6044                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6045                                 "Could not allocate access buffer");
6046                 return -ENOMEM;
6047         }
6048         rc = dasd_eckd_query_host_access(device, access);
6049         if (rc) {
6050                 kfree(access);
6051                 return rc;
6052         }
6053
6054         info = (struct dasd_ckd_host_information *)
6055                 access->host_access_information;
6056         for (i = 0; i < info->entry_count; i++) {
6057                 entry = (struct dasd_ckd_path_group_entry *)
6058                         (info->entry + i * info->entry_size);
6059                 /* PGID */
6060                 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
6061                 /* FLAGS */
6062                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
6063                 /* SYSPLEX NAME */
6064                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
6065                 EBCASC(sysplex, sizeof(sysplex));
6066                 seq_printf(m, "sysplex_name %8s\n", sysplex);
6067                 /* SUPPORTED CYLINDER */
6068                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
6069                 /* TIMESTAMP */
6070                 seq_printf(m, "timestamp %lu\n", (unsigned long)
6071                            entry->timestamp);
6072         }
6073         kfree(access);
6074
6075         return 0;
6076 }
6077
6078 /*
6079  * Perform Subsystem Function - CUIR response
6080  */
6081 static int
6082 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
6083                             __u32 message_id, __u8 lpum)
6084 {
6085         struct dasd_psf_cuir_response *psf_cuir;
6086         int pos = pathmask_to_pos(lpum);
6087         struct dasd_ccw_req *cqr;
6088         struct ccw1 *ccw;
6089         int rc;
6090
6091         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
6092                                    sizeof(struct dasd_psf_cuir_response),
6093                                    device, NULL);
6094
6095         if (IS_ERR(cqr)) {
6096                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6097                            "Could not allocate PSF-CUIR request");
6098                 return PTR_ERR(cqr);
6099         }
6100
6101         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
6102         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
6103         psf_cuir->cc = response;
6104         psf_cuir->chpid = device->path[pos].chpid;
6105         psf_cuir->message_id = message_id;
6106         psf_cuir->cssid = device->path[pos].cssid;
6107         psf_cuir->ssid = device->path[pos].ssid;
6108         ccw = cqr->cpaddr;
6109         ccw->cmd_code = DASD_ECKD_CCW_PSF;
6110         ccw->cda = (__u32)(addr_t)psf_cuir;
6111         ccw->flags = CCW_FLAG_SLI;
6112         ccw->count = sizeof(struct dasd_psf_cuir_response);
6113
6114         cqr->startdev = device;
6115         cqr->memdev = device;
6116         cqr->block = NULL;
6117         cqr->retries = 256;
6118         cqr->expires = 10*HZ;
6119         cqr->buildclk = get_tod_clock();
6120         cqr->status = DASD_CQR_FILLED;
6121         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
6122
6123         rc = dasd_sleep_on(cqr);
6124
6125         dasd_sfree_request(cqr, cqr->memdev);
6126         return rc;
6127 }
6128
6129 /*
6130  * return configuration data that is referenced by record selector
6131  * if a record selector is specified or per default return the
6132  * conf_data pointer for the path specified by lpum
6133  */
6134 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
6135                                                      __u8 lpum,
6136                                                      struct dasd_cuir_message *cuir)
6137 {
6138         struct dasd_conf_data *conf_data;
6139         int path, pos;
6140
6141         if (cuir->record_selector == 0)
6142                 goto out;
6143         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
6144                 conf_data = device->path[pos].conf_data;
6145                 if (conf_data->gneq.record_selector ==
6146                     cuir->record_selector)
6147                         return conf_data;
6148         }
6149 out:
6150         return device->path[pathmask_to_pos(lpum)].conf_data;
6151 }
6152
6153 /*
6154  * This function determines the scope of a reconfiguration request by
6155  * analysing the path and device selection data provided in the CUIR request.
6156  * Returns a path mask containing CUIR affected paths for the give device.
6157  *
6158  * If the CUIR request does not contain the required information return the
6159  * path mask of the path the attention message for the CUIR request was reveived
6160  * on.
6161  */
6162 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
6163                                 struct dasd_cuir_message *cuir)
6164 {
6165         struct dasd_conf_data *ref_conf_data;
6166         unsigned long bitmask = 0, mask = 0;
6167         struct dasd_conf_data *conf_data;
6168         unsigned int pos, path;
6169         char *ref_gneq, *gneq;
6170         char *ref_ned, *ned;
6171         int tbcpm = 0;
6172
6173         /* if CUIR request does not specify the scope use the path
6174            the attention message was presented on */
6175         if (!cuir->ned_map ||
6176             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
6177                 return lpum;
6178
6179         /* get reference conf data */
6180         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
6181         /* reference ned is determined by ned_map field */
6182         pos = 8 - ffs(cuir->ned_map);
6183         ref_ned = (char *)&ref_conf_data->neds[pos];
6184         ref_gneq = (char *)&ref_conf_data->gneq;
6185         /* transfer 24 bit neq_map to mask */
6186         mask = cuir->neq_map[2];
6187         mask |= cuir->neq_map[1] << 8;
6188         mask |= cuir->neq_map[0] << 16;
6189
6190         for (path = 0; path < 8; path++) {
6191                 /* initialise data per path */
6192                 bitmask = mask;
6193                 conf_data = device->path[path].conf_data;
6194                 pos = 8 - ffs(cuir->ned_map);
6195                 ned = (char *) &conf_data->neds[pos];
6196                 /* compare reference ned and per path ned */
6197                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
6198                         continue;
6199                 gneq = (char *)&conf_data->gneq;
6200                 /* compare reference gneq and per_path gneq under
6201                    24 bit mask where mask bit 0 equals byte 7 of
6202                    the gneq and mask bit 24 equals byte 31 */
6203                 while (bitmask) {
6204                         pos = ffs(bitmask) - 1;
6205                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
6206                             != 0)
6207                                 break;
6208                         clear_bit(pos, &bitmask);
6209                 }
6210                 if (bitmask)
6211                         continue;
6212                 /* device and path match the reference values
6213                    add path to CUIR scope */
6214                 tbcpm |= 0x80 >> path;
6215         }
6216         return tbcpm;
6217 }
6218
6219 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
6220                                        unsigned long paths, int action)
6221 {
6222         int pos;
6223
6224         while (paths) {
6225                 /* get position of bit in mask */
6226                 pos = 8 - ffs(paths);
6227                 /* get channel path descriptor from this position */
6228                 if (action == CUIR_QUIESCE)
6229                         pr_warn("Service on the storage server caused path %x.%02x to go offline",
6230                                 device->path[pos].cssid,
6231                                 device->path[pos].chpid);
6232                 else if (action == CUIR_RESUME)
6233                         pr_info("Path %x.%02x is back online after service on the storage server",
6234                                 device->path[pos].cssid,
6235                                 device->path[pos].chpid);
6236                 clear_bit(7 - pos, &paths);
6237         }
6238 }
6239
6240 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
6241                                       struct dasd_cuir_message *cuir)
6242 {
6243         unsigned long tbcpm;
6244
6245         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
6246         /* nothing to do if path is not in use */
6247         if (!(dasd_path_get_opm(device) & tbcpm))
6248                 return 0;
6249         if (!(dasd_path_get_opm(device) & ~tbcpm)) {
6250                 /* no path would be left if the CUIR action is taken
6251                    return error */
6252                 return -EINVAL;
6253         }
6254         /* remove device from operational path mask */
6255         dasd_path_remove_opm(device, tbcpm);
6256         dasd_path_add_cuirpm(device, tbcpm);
6257         return tbcpm;
6258 }
6259
6260 /*
6261  * walk through all devices and build a path mask to quiesce them
6262  * return an error if the last path to a device would be removed
6263  *
6264  * if only part of the devices are quiesced and an error
6265  * occurs no onlining necessary, the storage server will
6266  * notify the already set offline devices again
6267  */
6268 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
6269                                   struct dasd_cuir_message *cuir)
6270 {
6271         struct dasd_eckd_private *private = device->private;
6272         struct alias_pav_group *pavgroup, *tempgroup;
6273         struct dasd_device *dev, *n;
6274         unsigned long paths = 0;
6275         unsigned long flags;
6276         int tbcpm;
6277
6278         /* active devices */
6279         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6280                                  alias_list) {
6281                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6282                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6283                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6284                 if (tbcpm < 0)
6285                         goto out_err;
6286                 paths |= tbcpm;
6287         }
6288         /* inactive devices */
6289         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6290                                  alias_list) {
6291                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6292                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6293                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6294                 if (tbcpm < 0)
6295                         goto out_err;
6296                 paths |= tbcpm;
6297         }
6298         /* devices in PAV groups */
6299         list_for_each_entry_safe(pavgroup, tempgroup,
6300                                  &private->lcu->grouplist, group) {
6301                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6302                                          alias_list) {
6303                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6304                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6305                         spin_unlock_irqrestore(
6306                                 get_ccwdev_lock(dev->cdev), flags);
6307                         if (tbcpm < 0)
6308                                 goto out_err;
6309                         paths |= tbcpm;
6310                 }
6311                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6312                                          alias_list) {
6313                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6314                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6315                         spin_unlock_irqrestore(
6316                                 get_ccwdev_lock(dev->cdev), flags);
6317                         if (tbcpm < 0)
6318                                 goto out_err;
6319                         paths |= tbcpm;
6320                 }
6321         }
6322         /* notify user about all paths affected by CUIR action */
6323         dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
6324         return 0;
6325 out_err:
6326         return tbcpm;
6327 }
6328
6329 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
6330                                  struct dasd_cuir_message *cuir)
6331 {
6332         struct dasd_eckd_private *private = device->private;
6333         struct alias_pav_group *pavgroup, *tempgroup;
6334         struct dasd_device *dev, *n;
6335         unsigned long paths = 0;
6336         int tbcpm;
6337
6338         /*
6339          * the path may have been added through a generic path event before
6340          * only trigger path verification if the path is not already in use
6341          */
6342         list_for_each_entry_safe(dev, n,
6343                                  &private->lcu->active_devices,
6344                                  alias_list) {
6345                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6346                 paths |= tbcpm;
6347                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6348                         dasd_path_add_tbvpm(dev, tbcpm);
6349                         dasd_schedule_device_bh(dev);
6350                 }
6351         }
6352         list_for_each_entry_safe(dev, n,
6353                                  &private->lcu->inactive_devices,
6354                                  alias_list) {
6355                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6356                 paths |= tbcpm;
6357                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6358                         dasd_path_add_tbvpm(dev, tbcpm);
6359                         dasd_schedule_device_bh(dev);
6360                 }
6361         }
6362         /* devices in PAV groups */
6363         list_for_each_entry_safe(pavgroup, tempgroup,
6364                                  &private->lcu->grouplist,
6365                                  group) {
6366                 list_for_each_entry_safe(dev, n,
6367                                          &pavgroup->baselist,
6368                                          alias_list) {
6369                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6370                         paths |= tbcpm;
6371                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6372                                 dasd_path_add_tbvpm(dev, tbcpm);
6373                                 dasd_schedule_device_bh(dev);
6374                         }
6375                 }
6376                 list_for_each_entry_safe(dev, n,
6377                                          &pavgroup->aliaslist,
6378                                          alias_list) {
6379                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6380                         paths |= tbcpm;
6381                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6382                                 dasd_path_add_tbvpm(dev, tbcpm);
6383                                 dasd_schedule_device_bh(dev);
6384                         }
6385                 }
6386         }
6387         /* notify user about all paths affected by CUIR action */
6388         dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
6389         return 0;
6390 }
6391
6392 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
6393                                  __u8 lpum)
6394 {
6395         struct dasd_cuir_message *cuir = messages;
6396         int response;
6397
6398         DBF_DEV_EVENT(DBF_WARNING, device,
6399                       "CUIR request: %016llx %016llx %016llx %08x",
6400                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
6401                       ((u32 *)cuir)[3]);
6402
6403         if (cuir->code == CUIR_QUIESCE) {
6404                 /* quiesce */
6405                 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
6406                         response = PSF_CUIR_LAST_PATH;
6407                 else
6408                         response = PSF_CUIR_COMPLETED;
6409         } else if (cuir->code == CUIR_RESUME) {
6410                 /* resume */
6411                 dasd_eckd_cuir_resume(device, lpum, cuir);
6412                 response = PSF_CUIR_COMPLETED;
6413         } else
6414                 response = PSF_CUIR_NOT_SUPPORTED;
6415
6416         dasd_eckd_psf_cuir_response(device, response,
6417                                     cuir->message_id, lpum);
6418         DBF_DEV_EVENT(DBF_WARNING, device,
6419                       "CUIR response: %d on message ID %08x", response,
6420                       cuir->message_id);
6421         /* to make sure there is no attention left schedule work again */
6422         device->discipline->check_attention(device, lpum);
6423 }
6424
6425 static void dasd_eckd_oos_resume(struct dasd_device *device)
6426 {
6427         struct dasd_eckd_private *private = device->private;
6428         struct alias_pav_group *pavgroup, *tempgroup;
6429         struct dasd_device *dev, *n;
6430         unsigned long flags;
6431
6432         spin_lock_irqsave(&private->lcu->lock, flags);
6433         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6434                                  alias_list) {
6435                 if (dev->stopped & DASD_STOPPED_NOSPC)
6436                         dasd_generic_space_avail(dev);
6437         }
6438         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6439                                  alias_list) {
6440                 if (dev->stopped & DASD_STOPPED_NOSPC)
6441                         dasd_generic_space_avail(dev);
6442         }
6443         /* devices in PAV groups */
6444         list_for_each_entry_safe(pavgroup, tempgroup,
6445                                  &private->lcu->grouplist,
6446                                  group) {
6447                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6448                                          alias_list) {
6449                         if (dev->stopped & DASD_STOPPED_NOSPC)
6450                                 dasd_generic_space_avail(dev);
6451                 }
6452                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6453                                          alias_list) {
6454                         if (dev->stopped & DASD_STOPPED_NOSPC)
6455                                 dasd_generic_space_avail(dev);
6456                 }
6457         }
6458         spin_unlock_irqrestore(&private->lcu->lock, flags);
6459 }
6460
6461 static void dasd_eckd_handle_oos(struct dasd_device *device, void *messages,
6462                                  __u8 lpum)
6463 {
6464         struct dasd_oos_message *oos = messages;
6465
6466         switch (oos->code) {
6467         case REPO_WARN:
6468         case POOL_WARN:
6469                 dev_warn(&device->cdev->dev,
6470                          "Extent pool usage has reached a critical value\n");
6471                 dasd_eckd_oos_resume(device);
6472                 break;
6473         case REPO_EXHAUST:
6474         case POOL_EXHAUST:
6475                 dev_warn(&device->cdev->dev,
6476                          "Extent pool is exhausted\n");
6477                 break;
6478         case REPO_RELIEVE:
6479         case POOL_RELIEVE:
6480                 dev_info(&device->cdev->dev,
6481                          "Extent pool physical space constraint has been relieved\n");
6482                 break;
6483         }
6484
6485         /* In any case, update related data */
6486         dasd_eckd_read_ext_pool_info(device);
6487
6488         /* to make sure there is no attention left schedule work again */
6489         device->discipline->check_attention(device, lpum);
6490 }
6491
6492 static void dasd_eckd_check_attention_work(struct work_struct *work)
6493 {
6494         struct check_attention_work_data *data;
6495         struct dasd_rssd_messages *messages;
6496         struct dasd_device *device;
6497         int rc;
6498
6499         data = container_of(work, struct check_attention_work_data, worker);
6500         device = data->device;
6501         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
6502         if (!messages) {
6503                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6504                               "Could not allocate attention message buffer");
6505                 goto out;
6506         }
6507         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
6508         if (rc)
6509                 goto out;
6510
6511         if (messages->length == ATTENTION_LENGTH_CUIR &&
6512             messages->format == ATTENTION_FORMAT_CUIR)
6513                 dasd_eckd_handle_cuir(device, messages, data->lpum);
6514         if (messages->length == ATTENTION_LENGTH_OOS &&
6515             messages->format == ATTENTION_FORMAT_OOS)
6516                 dasd_eckd_handle_oos(device, messages, data->lpum);
6517
6518 out:
6519         dasd_put_device(device);
6520         kfree(messages);
6521         kfree(data);
6522 }
6523
6524 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
6525 {
6526         struct check_attention_work_data *data;
6527
6528         data = kzalloc(sizeof(*data), GFP_ATOMIC);
6529         if (!data)
6530                 return -ENOMEM;
6531         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
6532         dasd_get_device(device);
6533         data->device = device;
6534         data->lpum = lpum;
6535         schedule_work(&data->worker);
6536         return 0;
6537 }
6538
6539 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
6540 {
6541         if (~lpum & dasd_path_get_opm(device)) {
6542                 dasd_path_add_nohpfpm(device, lpum);
6543                 dasd_path_remove_opm(device, lpum);
6544                 dev_err(&device->cdev->dev,
6545                         "Channel path %02X lost HPF functionality and is disabled\n",
6546                         lpum);
6547                 return 1;
6548         }
6549         return 0;
6550 }
6551
6552 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
6553 {
6554         struct dasd_eckd_private *private = device->private;
6555
6556         dev_err(&device->cdev->dev,
6557                 "High Performance FICON disabled\n");
6558         private->fcx_max_data = 0;
6559 }
6560
6561 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
6562 {
6563         struct dasd_eckd_private *private = device->private;
6564
6565         return private->fcx_max_data ? 1 : 0;
6566 }
6567
6568 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
6569                                        struct irb *irb)
6570 {
6571         struct dasd_eckd_private *private = device->private;
6572
6573         if (!private->fcx_max_data) {
6574                 /* sanity check for no HPF, the error makes no sense */
6575                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6576                               "Trying to disable HPF for a non HPF device");
6577                 return;
6578         }
6579         if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
6580                 dasd_eckd_disable_hpf_device(device);
6581         } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
6582                 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
6583                         return;
6584                 dasd_eckd_disable_hpf_device(device);
6585                 dasd_path_set_tbvpm(device,
6586                                   dasd_path_get_hpfpm(device));
6587         }
6588         /*
6589          * prevent that any new I/O ist started on the device and schedule a
6590          * requeue of existing requests
6591          */
6592         dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
6593         dasd_schedule_requeue(device);
6594 }
6595
6596 /*
6597  * Initialize block layer request queue.
6598  */
6599 static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
6600 {
6601         unsigned int logical_block_size = block->bp_block;
6602         struct request_queue *q = block->request_queue;
6603         struct dasd_device *device = block->base;
6604         int max;
6605
6606         if (device->features & DASD_FEATURE_USERAW) {
6607                 /*
6608                  * the max_blocks value for raw_track access is 256
6609                  * it is higher than the native ECKD value because we
6610                  * only need one ccw per track
6611                  * so the max_hw_sectors are
6612                  * 2048 x 512B = 1024kB = 16 tracks
6613                  */
6614                 max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
6615         } else {
6616                 max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
6617         }
6618         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
6619         q->limits.max_dev_sectors = max;
6620         blk_queue_logical_block_size(q, logical_block_size);
6621         blk_queue_max_hw_sectors(q, max);
6622         blk_queue_max_segments(q, USHRT_MAX);
6623         /* With page sized segments each segment can be translated into one idaw/tidaw */
6624         blk_queue_max_segment_size(q, PAGE_SIZE);
6625         blk_queue_segment_boundary(q, PAGE_SIZE - 1);
6626 }
6627
6628 static struct ccw_driver dasd_eckd_driver = {
6629         .driver = {
6630                 .name   = "dasd-eckd",
6631                 .owner  = THIS_MODULE,
6632         },
6633         .ids         = dasd_eckd_ids,
6634         .probe       = dasd_eckd_probe,
6635         .remove      = dasd_generic_remove,
6636         .set_offline = dasd_generic_set_offline,
6637         .set_online  = dasd_eckd_set_online,
6638         .notify      = dasd_generic_notify,
6639         .path_event  = dasd_generic_path_event,
6640         .shutdown    = dasd_generic_shutdown,
6641         .uc_handler  = dasd_generic_uc_handler,
6642         .int_class   = IRQIO_DAS,
6643 };
6644
6645 static struct dasd_discipline dasd_eckd_discipline = {
6646         .owner = THIS_MODULE,
6647         .name = "ECKD",
6648         .ebcname = "ECKD",
6649         .check_device = dasd_eckd_check_characteristics,
6650         .uncheck_device = dasd_eckd_uncheck_device,
6651         .do_analysis = dasd_eckd_do_analysis,
6652         .pe_handler = dasd_eckd_pe_handler,
6653         .basic_to_ready = dasd_eckd_basic_to_ready,
6654         .online_to_ready = dasd_eckd_online_to_ready,
6655         .basic_to_known = dasd_eckd_basic_to_known,
6656         .setup_blk_queue = dasd_eckd_setup_blk_queue,
6657         .fill_geometry = dasd_eckd_fill_geometry,
6658         .start_IO = dasd_start_IO,
6659         .term_IO = dasd_term_IO,
6660         .handle_terminated_request = dasd_eckd_handle_terminated_request,
6661         .format_device = dasd_eckd_format_device,
6662         .check_device_format = dasd_eckd_check_device_format,
6663         .erp_action = dasd_eckd_erp_action,
6664         .erp_postaction = dasd_eckd_erp_postaction,
6665         .check_for_device_change = dasd_eckd_check_for_device_change,
6666         .build_cp = dasd_eckd_build_alias_cp,
6667         .free_cp = dasd_eckd_free_alias_cp,
6668         .dump_sense = dasd_eckd_dump_sense,
6669         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
6670         .fill_info = dasd_eckd_fill_info,
6671         .ioctl = dasd_eckd_ioctl,
6672         .reload = dasd_eckd_reload_device,
6673         .get_uid = dasd_eckd_get_uid,
6674         .kick_validate = dasd_eckd_kick_validate_server,
6675         .check_attention = dasd_eckd_check_attention,
6676         .host_access_count = dasd_eckd_host_access_count,
6677         .hosts_print = dasd_hosts_print,
6678         .handle_hpf_error = dasd_eckd_handle_hpf_error,
6679         .disable_hpf = dasd_eckd_disable_hpf_device,
6680         .hpf_enabled = dasd_eckd_hpf_enabled,
6681         .reset_path = dasd_eckd_reset_path,
6682         .is_ese = dasd_eckd_is_ese,
6683         .space_allocated = dasd_eckd_space_allocated,
6684         .space_configured = dasd_eckd_space_configured,
6685         .logical_capacity = dasd_eckd_logical_capacity,
6686         .release_space = dasd_eckd_release_space,
6687         .ext_pool_id = dasd_eckd_ext_pool_id,
6688         .ext_size = dasd_eckd_ext_size,
6689         .ext_pool_cap_at_warnlevel = dasd_eckd_ext_pool_cap_at_warnlevel,
6690         .ext_pool_warn_thrshld = dasd_eckd_ext_pool_warn_thrshld,
6691         .ext_pool_oos = dasd_eckd_ext_pool_oos,
6692         .ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,
6693         .ese_format = dasd_eckd_ese_format,
6694         .ese_read = dasd_eckd_ese_read,
6695 };
6696
6697 static int __init
6698 dasd_eckd_init(void)
6699 {
6700         int ret;
6701
6702         ASCEBC(dasd_eckd_discipline.ebcname, 4);
6703         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
6704                                    GFP_KERNEL | GFP_DMA);
6705         if (!dasd_reserve_req)
6706                 return -ENOMEM;
6707         dasd_vol_info_req = kmalloc(sizeof(*dasd_vol_info_req),
6708                                     GFP_KERNEL | GFP_DMA);
6709         if (!dasd_vol_info_req)
6710                 return -ENOMEM;
6711         pe_handler_worker = kmalloc(sizeof(*pe_handler_worker),
6712                                     GFP_KERNEL | GFP_DMA);
6713         if (!pe_handler_worker) {
6714                 kfree(dasd_reserve_req);
6715                 kfree(dasd_vol_info_req);
6716                 return -ENOMEM;
6717         }
6718         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
6719         if (!rawpadpage) {
6720                 kfree(pe_handler_worker);
6721                 kfree(dasd_reserve_req);
6722                 kfree(dasd_vol_info_req);
6723                 return -ENOMEM;
6724         }
6725         ret = ccw_driver_register(&dasd_eckd_driver);
6726         if (!ret)
6727                 wait_for_device_probe();
6728         else {
6729                 kfree(pe_handler_worker);
6730                 kfree(dasd_reserve_req);
6731                 kfree(dasd_vol_info_req);
6732                 free_page((unsigned long)rawpadpage);
6733         }
6734         return ret;
6735 }
6736
6737 static void __exit
6738 dasd_eckd_cleanup(void)
6739 {
6740         ccw_driver_unregister(&dasd_eckd_driver);
6741         kfree(pe_handler_worker);
6742         kfree(dasd_reserve_req);
6743         free_page((unsigned long)rawpadpage);
6744 }
6745
6746 module_init(dasd_eckd_init);
6747 module_exit(dasd_eckd_cleanup);