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->conf.ned->unit_addr;
 564         pfxdata->base_lss = basepriv->conf.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_conf *conf, struct dasd_uid *uid)
 740 {
 741         int count;
 742
 743         memset(uid, 0, sizeof(struct dasd_uid));
 744         memcpy(uid->vendor, conf->ned->HDA_manufacturer,
 745                sizeof(uid->vendor) - 1);
 746         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 747         memcpy(uid->serial, &conf->ned->serial,
 748                sizeof(uid->serial) - 1);
 749         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 750         uid->ssid = conf->gneq->subsystemID;
 751         uid->real_unit_addr = conf->ned->unit_addr;
 752         if (conf->sneq) {
 753                 uid->type = conf->sneq->sua_flags;
 754                 if (uid->type == UA_BASE_PAV_ALIAS)
 755                         uid->base_unit_addr = conf->sneq->base_unit_addr;
 756         } else {
 757                 uid->type = UA_BASE_DEVICE;
 758         }
 759         if (conf->vdsneq) {
 760                 for (count = 0; count < 16; count++) {
 761                         sprintf(uid->vduit+2*count, "%02x",
 762                                 conf->vdsneq->uit[count]);
 763                 }
 764         }
 765 }
 766
 767 /*
 768  * Generate device unique id that specifies the physical device.
 769  */
 770 static int dasd_eckd_generate_uid(struct dasd_device *device)
 771 {
 772         struct dasd_eckd_private *private = device->private;
 773         unsigned long flags;
 774
 775         if (!private)
 776                 return -ENODEV;
 777         if (!private->conf.ned || !private->conf.gneq)
 778                 return -ENODEV;
 779         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 780         create_uid(&private->conf, &private->uid);
 781         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 782         return 0;
 783 }
 784
 785 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 786 {
 787         struct dasd_eckd_private *private = device->private;
 788         unsigned long flags;
 789
 790         if (private) {
 791                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 792                 *uid = private->uid;
 793                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 794                 return 0;
 795         }
 796         return -EINVAL;
 797 }
 798
 799 /*
 800  * compare device UID with data of a given dasd_eckd_private structure
 801  * return 0 for match
 802  */
 803 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 804                                       struct dasd_conf *path_conf)
 805 {
 806         struct dasd_uid device_uid;
 807         struct dasd_uid path_uid;
 808
 809         create_uid(path_conf, &path_uid);
 810         dasd_eckd_get_uid(device, &device_uid);
 811
 812         return memcmp(&device_uid, &path_uid, sizeof(struct dasd_uid));
 813 }
 814
 815 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 816                                    struct dasd_ccw_req *cqr,
 817                                    __u8 *rcd_buffer,
 818                                    __u8 lpm)
 819 {
 820         struct ccw1 *ccw;
 821         /*
 822          * buffer has to start with EBCDIC "V1.0" to show
 823          * support for virtual device SNEQ
 824          */
 825         rcd_buffer[0] = 0xE5;
 826         rcd_buffer[1] = 0xF1;
 827         rcd_buffer[2] = 0x4B;
 828         rcd_buffer[3] = 0xF0;
 829
 830         ccw = cqr->cpaddr;
 831         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 832         ccw->flags = 0;
 833         ccw->cda = (__u32)(addr_t)rcd_buffer;
 834         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 835         cqr->magic = DASD_ECKD_MAGIC;
 836
 837         cqr->startdev = device;
 838         cqr->memdev = device;
 839         cqr->block = NULL;
 840         cqr->expires = 10*HZ;
 841         cqr->lpm = lpm;
 842         cqr->retries = 256;
 843         cqr->buildclk = get_tod_clock();
 844         cqr->status = DASD_CQR_FILLED;
 845         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 846 }
 847
 848 /*
 849  * Wakeup helper for read_conf
 850  * if the cqr is not done and needs some error recovery
 851  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 852  * to show support for virtual device SNEQ
 853  */
 854 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 855 {
 856         struct ccw1 *ccw;
 857         __u8 *rcd_buffer;
 858
 859         if (cqr->status !=  DASD_CQR_DONE) {
 860                 ccw = cqr->cpaddr;
 861                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 862                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 863
 864                 rcd_buffer[0] = 0xE5;
 865                 rcd_buffer[1] = 0xF1;
 866                 rcd_buffer[2] = 0x4B;
 867                 rcd_buffer[3] = 0xF0;
 868         }
 869         dasd_wakeup_cb(cqr, data);
 870 }
 871
 872 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 873                                            struct dasd_ccw_req *cqr,
 874                                            __u8 *rcd_buffer,
 875                                            __u8 lpm)
 876 {
 877         struct ciw *ciw;
 878         int rc;
 879         /*
 880          * sanity check: scan for RCD command in extended SenseID data
 881          * some devices do not support RCD
 882          */
 883         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 884         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 885                 return -EOPNOTSUPP;
 886
 887         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 888         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 889         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 890         cqr->retries = 5;
 891         cqr->callback = read_conf_cb;
 892         rc = dasd_sleep_on_immediatly(cqr);
 893         return rc;
 894 }
 895
 896 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 897                                    void **rcd_buffer,
 898                                    int *rcd_buffer_size, __u8 lpm)
 899 {
 900         struct ciw *ciw;
 901         char *rcd_buf = NULL;
 902         int ret;
 903         struct dasd_ccw_req *cqr;
 904
 905         /*
 906          * sanity check: scan for RCD command in extended SenseID data
 907          * some devices do not support RCD
 908          */
 909         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 910         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 911                 ret = -EOPNOTSUPP;
 912                 goto out_error;
 913         }
 914         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 915         if (!rcd_buf) {
 916                 ret = -ENOMEM;
 917                 goto out_error;
 918         }
 919         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 920                                    0, /* use rcd_buf as data ara */
 921                                    device, NULL);
 922         if (IS_ERR(cqr)) {
 923                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 924                               "Could not allocate RCD request");
 925                 ret = -ENOMEM;
 926                 goto out_error;
 927         }
 928         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 929         cqr->callback = read_conf_cb;
 930         ret = dasd_sleep_on(cqr);
 931         /*
 932          * on success we update the user input parms
 933          */
 934         dasd_sfree_request(cqr, cqr->memdev);
 935         if (ret)
 936                 goto out_error;
 937
 938         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 939         *rcd_buffer = rcd_buf;
 940         return 0;
 941 out_error:
 942         kfree(rcd_buf);
 943         *rcd_buffer = NULL;
 944         *rcd_buffer_size = 0;
 945         return ret;
 946 }
 947
 948 static int dasd_eckd_identify_conf_parts(struct dasd_conf *conf)
 949 {
 950
 951         struct dasd_sneq *sneq;
 952         int i, count;
 953
 954         conf->ned = NULL;
 955         conf->sneq = NULL;
 956         conf->vdsneq = NULL;
 957         conf->gneq = NULL;
 958         count = conf->len / sizeof(struct dasd_sneq);
 959         sneq = (struct dasd_sneq *)conf->data;
 960         for (i = 0; i < count; ++i) {
 961                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 962                         conf->sneq = sneq;
 963                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 964                         conf->vdsneq = (struct vd_sneq *)sneq;
 965                 else if (sneq->flags.identifier == 2)
 966                         conf->gneq = (struct dasd_gneq *)sneq;
 967                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 968                         conf->ned = (struct dasd_ned *)sneq;
 969                 sneq++;
 970         }
 971         if (!conf->ned || !conf->gneq) {
 972                 conf->ned = NULL;
 973                 conf->sneq = NULL;
 974                 conf->vdsneq = NULL;
 975                 conf->gneq = NULL;
 976                 return -EINVAL;
 977         }
 978         return 0;
 979
 980 };
 981
 982 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 983 {
 984         struct dasd_gneq *gneq;
 985         int i, count, found;
 986
 987         count = conf_len / sizeof(*gneq);
 988         gneq = (struct dasd_gneq *)conf_data;
 989         found = 0;
 990         for (i = 0; i < count; ++i) {
 991                 if (gneq->flags.identifier == 2) {
 992                         found = 1;
 993                         break;
 994                 }
 995                 gneq++;
 996         }
 997         if (found)
 998                 return ((char *)gneq)[18] & 0x07;
 999         else
1000                 return 0;
1001 }
1002
1003 static void dasd_eckd_store_conf_data(struct dasd_device *device,
1004                                       struct dasd_conf_data *conf_data, int chp)
1005 {
1006         struct dasd_eckd_private *private = device->private;
1007         struct channel_path_desc_fmt0 *chp_desc;
1008         struct subchannel_id sch_id;
1009         void *cdp;
1010
1011         /*
1012          * path handling and read_conf allocate data
1013          * free it before replacing the pointer
1014          * also replace the old private->conf_data pointer
1015          * with the new one if this points to the same data
1016          */
1017         cdp = device->path[chp].conf_data;
1018         if (private->conf.data == cdp) {
1019                 private->conf.data = (void *)conf_data;
1020                 dasd_eckd_identify_conf_parts(&private->conf);
1021         }
1022         ccw_device_get_schid(device->cdev, &sch_id);
1023         device->path[chp].conf_data = conf_data;
1024         device->path[chp].cssid = sch_id.cssid;
1025         device->path[chp].ssid = sch_id.ssid;
1026         chp_desc = ccw_device_get_chp_desc(device->cdev, chp);
1027         if (chp_desc)
1028                 device->path[chp].chpid = chp_desc->chpid;
1029         kfree(chp_desc);
1030         kfree(cdp);
1031 }
1032
1033 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1034 {
1035         struct dasd_eckd_private *private = device->private;
1036         int i;
1037
1038         private->conf.data = NULL;
1039         private->conf.len = 0;
1040         for (i = 0; i < 8; i++) {
1041                 kfree(device->path[i].conf_data);
1042                 device->path[i].conf_data = NULL;
1043                 device->path[i].cssid = 0;
1044                 device->path[i].ssid = 0;
1045                 device->path[i].chpid = 0;
1046                 dasd_path_notoper(device, i);
1047         }
1048 }
1049
1050 static void dasd_eckd_read_fc_security(struct dasd_device *device)
1051 {
1052         struct dasd_eckd_private *private = device->private;
1053         u8 esm_valid;
1054         u8 esm[8];
1055         int chp;
1056         int rc;
1057
1058         rc = chsc_scud(private->uid.ssid, (u64 *)esm, &esm_valid);
1059         if (rc) {
1060                 for (chp = 0; chp < 8; chp++)
1061                         device->path[chp].fc_security = 0;
1062                 return;
1063         }
1064
1065         for (chp = 0; chp < 8; chp++) {
1066                 if (esm_valid & (0x80 >> chp))
1067                         device->path[chp].fc_security = esm[chp];
1068                 else
1069                         device->path[chp].fc_security = 0;
1070         }
1071 }
1072
1073 static void dasd_eckd_get_uid_string(struct dasd_conf *conf,
1074                                      char *print_uid)
1075 {
1076         struct dasd_uid uid;
1077
1078         create_uid(conf, &uid);
1079         if (strlen(uid.vduit) > 0)
1080                 snprintf(print_uid, sizeof(*print_uid),
1081                          "%s.%s.%04x.%02x.%s",
1082                          uid.vendor, uid.serial, uid.ssid,
1083                          uid.real_unit_addr, uid.vduit);
1084         else
1085                 snprintf(print_uid, sizeof(*print_uid),
1086                          "%s.%s.%04x.%02x",
1087                          uid.vendor, uid.serial, uid.ssid,
1088                          uid.real_unit_addr);
1089 }
1090
1091 static int dasd_eckd_check_cabling(struct dasd_device *device,
1092                                    void *conf_data, __u8 lpm)
1093 {
1094         struct dasd_eckd_private *private = device->private;
1095         char print_path_uid[60], print_device_uid[60];
1096         struct dasd_conf path_conf;
1097
1098         path_conf.data = conf_data;
1099         path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1100         if (dasd_eckd_identify_conf_parts(&path_conf))
1101                 return 1;
1102
1103         if (dasd_eckd_compare_path_uid(device, &path_conf)) {
1104                 dasd_eckd_get_uid_string(&path_conf, print_path_uid);
1105                 dasd_eckd_get_uid_string(&private->conf, print_device_uid);
1106                 dev_err(&device->cdev->dev,
1107                         "Not all channel paths lead to the same device, path %02X leads to device %s instead of %s\n",
1108                         lpm, print_path_uid, print_device_uid);
1109                 return 1;
1110         }
1111
1112         return 0;
1113 }
1114
1115 static int dasd_eckd_read_conf(struct dasd_device *device)
1116 {
1117         void *conf_data;
1118         int conf_len, conf_data_saved;
1119         int rc, path_err, pos;
1120         __u8 lpm, opm;
1121         struct dasd_eckd_private *private;
1122
1123         private = device->private;
1124         opm = ccw_device_get_path_mask(device->cdev);
1125         conf_data_saved = 0;
1126         path_err = 0;
1127         /* get configuration data per operational path */
1128         for (lpm = 0x80; lpm; lpm>>= 1) {
1129                 if (!(lpm & opm))
1130                         continue;
1131                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1132                                              &conf_len, lpm);
1133                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1134                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1135                                         "Read configuration data returned "
1136                                         "error %d", rc);
1137                         return rc;
1138                 }
1139                 if (conf_data == NULL) {
1140                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1141                                         "No configuration data "
1142                                         "retrieved");
1143                         /* no further analysis possible */
1144                         dasd_path_add_opm(device, opm);
1145                         continue;       /* no error */
1146                 }
1147                 /* save first valid configuration data */
1148                 if (!conf_data_saved) {
1149                         /* initially clear previously stored conf_data */
1150                         dasd_eckd_clear_conf_data(device);
1151                         private->conf.data = conf_data;
1152                         private->conf.len = conf_len;
1153                         if (dasd_eckd_identify_conf_parts(&private->conf)) {
1154                                 private->conf.data = NULL;
1155                                 private->conf.len = 0;
1156                                 kfree(conf_data);
1157                                 continue;
1158                         }
1159                         /*
1160                          * build device UID that other path data
1161                          * can be compared to it
1162                          */
1163                         dasd_eckd_generate_uid(device);
1164                         conf_data_saved++;
1165                 } else if (dasd_eckd_check_cabling(device, conf_data, lpm)) {
1166                         dasd_path_add_cablepm(device, lpm);
1167                         path_err = -EINVAL;
1168                         kfree(conf_data);
1169                         continue;
1170                 }
1171
1172                 pos = pathmask_to_pos(lpm);
1173                 dasd_eckd_store_conf_data(device, conf_data, pos);
1174
1175                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1176                 case 0x02:
1177                         dasd_path_add_nppm(device, lpm);
1178                         break;
1179                 case 0x03:
1180                         dasd_path_add_ppm(device, lpm);
1181                         break;
1182                 }
1183                 if (!dasd_path_get_opm(device)) {
1184                         dasd_path_set_opm(device, lpm);
1185                         dasd_generic_path_operational(device);
1186                 } else {
1187                         dasd_path_add_opm(device, lpm);
1188                 }
1189         }
1190
1191         return path_err;
1192 }
1193
1194 static u32 get_fcx_max_data(struct dasd_device *device)
1195 {
1196         struct dasd_eckd_private *private = device->private;
1197         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1198         unsigned int mdc;
1199         int tpm;
1200
1201         if (dasd_nofcx)
1202                 return 0;
1203         /* is transport mode supported? */
1204         fcx_in_css = css_general_characteristics.fcx;
1205         fcx_in_gneq = private->conf.gneq->reserved2[7] & 0x04;
1206         fcx_in_features = private->features.feature[40] & 0x80;
1207         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1208
1209         if (!tpm)
1210                 return 0;
1211
1212         mdc = ccw_device_get_mdc(device->cdev, 0);
1213         if (mdc == 0) {
1214                 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1215                 return 0;
1216         } else {
1217                 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1218         }
1219 }
1220
1221 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1222 {
1223         struct dasd_eckd_private *private = device->private;
1224         unsigned int mdc;
1225         u32 fcx_max_data;
1226
1227         if (private->fcx_max_data) {
1228                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1229                 if (mdc == 0) {
1230                         dev_warn(&device->cdev->dev,
1231                                  "Detecting the maximum data size for zHPF "
1232                                  "requests failed (rc=%d) for a new path %x\n",
1233                                  mdc, lpm);
1234                         return mdc;
1235                 }
1236                 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1237                 if (fcx_max_data < private->fcx_max_data) {
1238                         dev_warn(&device->cdev->dev,
1239                                  "The maximum data size for zHPF requests %u "
1240                                  "on a new path %x is below the active maximum "
1241                                  "%u\n", fcx_max_data, lpm,
1242                                  private->fcx_max_data);
1243                         return -EACCES;
1244                 }
1245         }
1246         return 0;
1247 }
1248
1249 static int rebuild_device_uid(struct dasd_device *device,
1250                               struct pe_handler_work_data *data)
1251 {
1252         struct dasd_eckd_private *private = device->private;
1253         __u8 lpm, opm = dasd_path_get_opm(device);
1254         int rc = -ENODEV;
1255
1256         for (lpm = 0x80; lpm; lpm >>= 1) {
1257                 if (!(lpm & opm))
1258                         continue;
1259                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1260                 memset(&data->cqr, 0, sizeof(data->cqr));
1261                 data->cqr.cpaddr = &data->ccw;
1262                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1263                                                      data->rcd_buffer,
1264                                                      lpm);
1265
1266                 if (rc) {
1267                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1268                                 continue;
1269                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1270                                         "Read configuration data "
1271                                         "returned error %d", rc);
1272                         break;
1273                 }
1274                 memcpy(private->conf.data, data->rcd_buffer,
1275                        DASD_ECKD_RCD_DATA_SIZE);
1276                 if (dasd_eckd_identify_conf_parts(&private->conf)) {
1277                         rc = -ENODEV;
1278                 } else /* first valid path is enough */
1279                         break;
1280         }
1281
1282         if (!rc)
1283                 rc = dasd_eckd_generate_uid(device);
1284
1285         return rc;
1286 }
1287
1288 static void dasd_eckd_path_available_action(struct dasd_device *device,
1289                                             struct pe_handler_work_data *data)
1290 {
1291         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1292         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1293         struct dasd_conf_data *conf_data;
1294         struct dasd_conf path_conf;
1295         unsigned long flags;
1296         char print_uid[60];
1297         int rc, pos;
1298
1299         opm = 0;
1300         npm = 0;
1301         ppm = 0;
1302         epm = 0;
1303         hpfpm = 0;
1304         cablepm = 0;
1305
1306         for (lpm = 0x80; lpm; lpm >>= 1) {
1307                 if (!(lpm & data->tbvpm))
1308                         continue;
1309                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1310                 memset(&data->cqr, 0, sizeof(data->cqr));
1311                 data->cqr.cpaddr = &data->ccw;
1312                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1313                                                      data->rcd_buffer,
1314                                                      lpm);
1315                 if (!rc) {
1316                         switch (dasd_eckd_path_access(data->rcd_buffer,
1317                                                       DASD_ECKD_RCD_DATA_SIZE)
1318                                 ) {
1319                         case 0x02:
1320                                 npm |= lpm;
1321                                 break;
1322                         case 0x03:
1323                                 ppm |= lpm;
1324                                 break;
1325                         }
1326                         opm |= lpm;
1327                 } else if (rc == -EOPNOTSUPP) {
1328                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1329                                         "path verification: No configuration "
1330                                         "data retrieved");
1331                         opm |= lpm;
1332                 } else if (rc == -EAGAIN) {
1333                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1334                                         "path verification: device is stopped,"
1335                                         " try again later");
1336                         epm |= lpm;
1337                 } else {
1338                         dev_warn(&device->cdev->dev,
1339                                  "Reading device feature codes failed "
1340                                  "(rc=%d) for new path %x\n", rc, lpm);
1341                         continue;
1342                 }
1343                 if (verify_fcx_max_data(device, lpm)) {
1344                         opm &= ~lpm;
1345                         npm &= ~lpm;
1346                         ppm &= ~lpm;
1347                         hpfpm |= lpm;
1348                         continue;
1349                 }
1350
1351                 /*
1352                  * save conf_data for comparison after
1353                  * rebuild_device_uid may have changed
1354                  * the original data
1355                  */
1356                 memcpy(&path_rcd_buf, data->rcd_buffer,
1357                        DASD_ECKD_RCD_DATA_SIZE);
1358                 path_conf.data = (void *)&path_rcd_buf;
1359                 path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1360                 if (dasd_eckd_identify_conf_parts(&path_conf)) {
1361                         path_conf.data = NULL;
1362                         path_conf.len = 0;
1363                         continue;
1364                 }
1365
1366                 /*
1367                  * compare path UID with device UID only if at least
1368                  * one valid path is left
1369                  * in other case the device UID may have changed and
1370                  * the first working path UID will be used as device UID
1371                  */
1372                 if (dasd_path_get_opm(device) &&
1373                     dasd_eckd_compare_path_uid(device, &path_conf)) {
1374                         /*
1375                          * the comparison was not successful
1376                          * rebuild the device UID with at least one
1377                          * known path in case a z/VM hyperswap command
1378                          * has changed the device
1379                          *
1380                          * after this compare again
1381                          *
1382                          * if either the rebuild or the recompare fails
1383                          * the path can not be used
1384                          */
1385                         if (rebuild_device_uid(device, data) ||
1386                             dasd_eckd_compare_path_uid(
1387                                     device, &path_conf)) {
1388                                 dasd_eckd_get_uid_string(&path_conf, print_uid);
1389                                 dev_err(&device->cdev->dev,
1390                                         "The newly added channel path %02X "
1391                                         "will not be used because it leads "
1392                                         "to a different device %s\n",
1393                                         lpm, print_uid);
1394                                 opm &= ~lpm;
1395                                 npm &= ~lpm;
1396                                 ppm &= ~lpm;
1397                                 cablepm |= lpm;
1398                                 continue;
1399                         }
1400                 }
1401
1402                 conf_data = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL);
1403                 if (conf_data) {
1404                         memcpy(conf_data, data->rcd_buffer,
1405                                DASD_ECKD_RCD_DATA_SIZE);
1406                 } else {
1407                         /*
1408                          * path is operational but path config data could not
1409                          * be stored due to low mem condition
1410                          * add it to the error path mask and schedule a path
1411                          * verification later that this could be added again
1412                          */
1413                         epm |= lpm;
1414                 }
1415                 pos = pathmask_to_pos(lpm);
1416                 dasd_eckd_store_conf_data(device, conf_data, pos);
1417
1418                 /*
1419                  * There is a small chance that a path is lost again between
1420                  * above path verification and the following modification of
1421                  * the device opm mask. We could avoid that race here by using
1422                  * yet another path mask, but we rather deal with this unlikely
1423                  * situation in dasd_start_IO.
1424                  */
1425                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1426                 if (!dasd_path_get_opm(device) && opm) {
1427                         dasd_path_set_opm(device, opm);
1428                         dasd_generic_path_operational(device);
1429                 } else {
1430                         dasd_path_add_opm(device, opm);
1431                 }
1432                 dasd_path_add_nppm(device, npm);
1433                 dasd_path_add_ppm(device, ppm);
1434                 if (epm) {
1435                         dasd_path_add_tbvpm(device, epm);
1436                         dasd_device_set_timer(device, 50);
1437                 }
1438                 dasd_path_add_cablepm(device, cablepm);
1439                 dasd_path_add_nohpfpm(device, hpfpm);
1440                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1441
1442                 dasd_path_create_kobj(device, pos);
1443         }
1444 }
1445
1446 static void do_pe_handler_work(struct work_struct *work)
1447 {
1448         struct pe_handler_work_data *data;
1449         struct dasd_device *device;
1450
1451         data = container_of(work, struct pe_handler_work_data, worker);
1452         device = data->device;
1453
1454         /* delay path verification until device was resumed */
1455         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1456                 schedule_work(work);
1457                 return;
1458         }
1459         /* check if path verification already running and delay if so */
1460         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1461                 schedule_work(work);
1462                 return;
1463         }
1464
1465         if (data->tbvpm)
1466                 dasd_eckd_path_available_action(device, data);
1467         if (data->fcsecpm)
1468                 dasd_eckd_read_fc_security(device);
1469
1470         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1471         dasd_put_device(device);
1472         if (data->isglobal)
1473                 mutex_unlock(&dasd_pe_handler_mutex);
1474         else
1475                 kfree(data);
1476 }
1477
1478 static int dasd_eckd_pe_handler(struct dasd_device *device,
1479                                 __u8 tbvpm, __u8 fcsecpm)
1480 {
1481         struct pe_handler_work_data *data;
1482
1483         data = kzalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1484         if (!data) {
1485                 if (mutex_trylock(&dasd_pe_handler_mutex)) {
1486                         data = pe_handler_worker;
1487                         data->isglobal = 1;
1488                 } else {
1489                         return -ENOMEM;
1490                 }
1491         }
1492         INIT_WORK(&data->worker, do_pe_handler_work);
1493         dasd_get_device(device);
1494         data->device = device;
1495         data->tbvpm = tbvpm;
1496         data->fcsecpm = fcsecpm;
1497         schedule_work(&data->worker);
1498         return 0;
1499 }
1500
1501 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1502 {
1503         struct dasd_eckd_private *private = device->private;
1504         unsigned long flags;
1505
1506         if (!private->fcx_max_data)
1507                 private->fcx_max_data = get_fcx_max_data(device);
1508         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1509         dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1510         dasd_schedule_device_bh(device);
1511         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1512 }
1513
1514 static int dasd_eckd_read_features(struct dasd_device *device)
1515 {
1516         struct dasd_eckd_private *private = device->private;
1517         struct dasd_psf_prssd_data *prssdp;
1518         struct dasd_rssd_features *features;
1519         struct dasd_ccw_req *cqr;
1520         struct ccw1 *ccw;
1521         int rc;
1522
1523         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1524         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1525                                    (sizeof(struct dasd_psf_prssd_data) +
1526                                     sizeof(struct dasd_rssd_features)),
1527                                    device, NULL);
1528         if (IS_ERR(cqr)) {
1529                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1530                                 "allocate initialization request");
1531                 return PTR_ERR(cqr);
1532         }
1533         cqr->startdev = device;
1534         cqr->memdev = device;
1535         cqr->block = NULL;
1536         cqr->retries = 256;
1537         cqr->expires = 10 * HZ;
1538
1539         /* Prepare for Read Subsystem Data */
1540         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1541         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1542         prssdp->order = PSF_ORDER_PRSSD;
1543         prssdp->suborder = 0x41;        /* Read Feature Codes */
1544         /* all other bytes of prssdp must be zero */
1545
1546         ccw = cqr->cpaddr;
1547         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1548         ccw->count = sizeof(struct dasd_psf_prssd_data);
1549         ccw->flags |= CCW_FLAG_CC;
1550         ccw->cda = (__u32)(addr_t) prssdp;
1551
1552         /* Read Subsystem Data - feature codes */
1553         features = (struct dasd_rssd_features *) (prssdp + 1);
1554         memset(features, 0, sizeof(struct dasd_rssd_features));
1555
1556         ccw++;
1557         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1558         ccw->count = sizeof(struct dasd_rssd_features);
1559         ccw->cda = (__u32)(addr_t) features;
1560
1561         cqr->buildclk = get_tod_clock();
1562         cqr->status = DASD_CQR_FILLED;
1563         rc = dasd_sleep_on(cqr);
1564         if (rc == 0) {
1565                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1566                 features = (struct dasd_rssd_features *) (prssdp + 1);
1567                 memcpy(&private->features, features,
1568                        sizeof(struct dasd_rssd_features));
1569         } else
1570                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1571                          " failed with rc=%d\n", rc);
1572         dasd_sfree_request(cqr, cqr->memdev);
1573         return rc;
1574 }
1575
1576 /* Read Volume Information - Volume Storage Query */
1577 static int dasd_eckd_read_vol_info(struct dasd_device *device)
1578 {
1579         struct dasd_eckd_private *private = device->private;
1580         struct dasd_psf_prssd_data *prssdp;
1581         struct dasd_rssd_vsq *vsq;
1582         struct dasd_ccw_req *cqr;
1583         struct ccw1 *ccw;
1584         int useglobal;
1585         int rc;
1586
1587         /* This command cannot be executed on an alias device */
1588         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1589             private->uid.type == UA_HYPER_PAV_ALIAS)
1590                 return 0;
1591
1592         useglobal = 0;
1593         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1594                                    sizeof(*prssdp) + sizeof(*vsq), device, NULL);
1595         if (IS_ERR(cqr)) {
1596                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1597                                 "Could not allocate initialization request");
1598                 mutex_lock(&dasd_vol_info_mutex);
1599                 useglobal = 1;
1600                 cqr = &dasd_vol_info_req->cqr;
1601                 memset(cqr, 0, sizeof(*cqr));
1602                 memset(dasd_vol_info_req, 0, sizeof(*dasd_vol_info_req));
1603                 cqr->cpaddr = &dasd_vol_info_req->ccw;
1604                 cqr->data = &dasd_vol_info_req->data;
1605                 cqr->magic = DASD_ECKD_MAGIC;
1606         }
1607
1608         /* Prepare for Read Subsystem Data */
1609         prssdp = cqr->data;
1610         prssdp->order = PSF_ORDER_PRSSD;
1611         prssdp->suborder = PSF_SUBORDER_VSQ;    /* Volume Storage Query */
1612         prssdp->lss = private->conf.ned->ID;
1613         prssdp->volume = private->conf.ned->unit_addr;
1614
1615         ccw = cqr->cpaddr;
1616         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1617         ccw->count = sizeof(*prssdp);
1618         ccw->flags |= CCW_FLAG_CC;
1619         ccw->cda = (__u32)(addr_t)prssdp;
1620
1621         /* Read Subsystem Data - Volume Storage Query */
1622         vsq = (struct dasd_rssd_vsq *)(prssdp + 1);
1623         memset(vsq, 0, sizeof(*vsq));
1624
1625         ccw++;
1626         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1627         ccw->count = sizeof(*vsq);
1628         ccw->flags |= CCW_FLAG_SLI;
1629         ccw->cda = (__u32)(addr_t)vsq;
1630
1631         cqr->buildclk = get_tod_clock();
1632         cqr->status = DASD_CQR_FILLED;
1633         cqr->startdev = device;
1634         cqr->memdev = device;
1635         cqr->block = NULL;
1636         cqr->retries = 256;
1637         cqr->expires = device->default_expires * HZ;
1638         /* The command might not be supported. Suppress the error output */
1639         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1640
1641         rc = dasd_sleep_on_interruptible(cqr);
1642         if (rc == 0) {
1643                 memcpy(&private->vsq, vsq, sizeof(*vsq));
1644         } else {
1645                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1646                                 "Reading the volume storage information failed with rc=%d", rc);
1647         }
1648
1649         if (useglobal)
1650                 mutex_unlock(&dasd_vol_info_mutex);
1651         else
1652                 dasd_sfree_request(cqr, cqr->memdev);
1653
1654         return rc;
1655 }
1656
1657 static int dasd_eckd_is_ese(struct dasd_device *device)
1658 {
1659         struct dasd_eckd_private *private = device->private;
1660
1661         return private->vsq.vol_info.ese;
1662 }
1663
1664 static int dasd_eckd_ext_pool_id(struct dasd_device *device)
1665 {
1666         struct dasd_eckd_private *private = device->private;
1667
1668         return private->vsq.extent_pool_id;
1669 }
1670
1671 /*
1672  * This value represents the total amount of available space. As more space is
1673  * allocated by ESE volumes, this value will decrease.
1674  * The data for this value is therefore updated on any call.
1675  */
1676 static int dasd_eckd_space_configured(struct dasd_device *device)
1677 {
1678         struct dasd_eckd_private *private = device->private;
1679         int rc;
1680
1681         rc = dasd_eckd_read_vol_info(device);
1682
1683         return rc ? : private->vsq.space_configured;
1684 }
1685
1686 /*
1687  * The value of space allocated by an ESE volume may have changed and is
1688  * therefore updated on any call.
1689  */
1690 static int dasd_eckd_space_allocated(struct dasd_device *device)
1691 {
1692         struct dasd_eckd_private *private = device->private;
1693         int rc;
1694
1695         rc = dasd_eckd_read_vol_info(device);
1696
1697         return rc ? : private->vsq.space_allocated;
1698 }
1699
1700 static int dasd_eckd_logical_capacity(struct dasd_device *device)
1701 {
1702         struct dasd_eckd_private *private = device->private;
1703
1704         return private->vsq.logical_capacity;
1705 }
1706
1707 static void dasd_eckd_ext_pool_exhaust_work(struct work_struct *work)
1708 {
1709         struct ext_pool_exhaust_work_data *data;
1710         struct dasd_device *device;
1711         struct dasd_device *base;
1712
1713         data = container_of(work, struct ext_pool_exhaust_work_data, worker);
1714         device = data->device;
1715         base = data->base;
1716
1717         if (!base)
1718                 base = device;
1719         if (dasd_eckd_space_configured(base) != 0) {
1720                 dasd_generic_space_avail(device);
1721         } else {
1722                 dev_warn(&device->cdev->dev, "No space left in the extent pool\n");
1723                 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "out of space");
1724         }
1725
1726         dasd_put_device(device);
1727         kfree(data);
1728 }
1729
1730 static int dasd_eckd_ext_pool_exhaust(struct dasd_device *device,
1731                                       struct dasd_ccw_req *cqr)
1732 {
1733         struct ext_pool_exhaust_work_data *data;
1734
1735         data = kzalloc(sizeof(*data), GFP_ATOMIC);
1736         if (!data)
1737                 return -ENOMEM;
1738         INIT_WORK(&data->worker, dasd_eckd_ext_pool_exhaust_work);
1739         dasd_get_device(device);
1740         data->device = device;
1741
1742         if (cqr->block)
1743                 data->base = cqr->block->base;
1744         else if (cqr->basedev)
1745                 data->base = cqr->basedev;
1746         else
1747                 data->base = NULL;
1748
1749         schedule_work(&data->worker);
1750
1751         return 0;
1752 }
1753
1754 static void dasd_eckd_cpy_ext_pool_data(struct dasd_device *device,
1755                                         struct dasd_rssd_lcq *lcq)
1756 {
1757         struct dasd_eckd_private *private = device->private;
1758         int pool_id = dasd_eckd_ext_pool_id(device);
1759         struct dasd_ext_pool_sum eps;
1760         int i;
1761
1762         for (i = 0; i < lcq->pool_count; i++) {
1763                 eps = lcq->ext_pool_sum[i];
1764                 if (eps.pool_id == pool_id) {
1765                         memcpy(&private->eps, &eps,
1766                                sizeof(struct dasd_ext_pool_sum));
1767                 }
1768         }
1769 }
1770
1771 /* Read Extent Pool Information - Logical Configuration Query */
1772 static int dasd_eckd_read_ext_pool_info(struct dasd_device *device)
1773 {
1774         struct dasd_eckd_private *private = device->private;
1775         struct dasd_psf_prssd_data *prssdp;
1776         struct dasd_rssd_lcq *lcq;
1777         struct dasd_ccw_req *cqr;
1778         struct ccw1 *ccw;
1779         int rc;
1780
1781         /* This command cannot be executed on an alias device */
1782         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1783             private->uid.type == UA_HYPER_PAV_ALIAS)
1784                 return 0;
1785
1786         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1787                                    sizeof(*prssdp) + sizeof(*lcq), device, NULL);
1788         if (IS_ERR(cqr)) {
1789                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1790                                 "Could not allocate initialization request");
1791                 return PTR_ERR(cqr);
1792         }
1793
1794         /* Prepare for Read Subsystem Data */
1795         prssdp = cqr->data;
1796         memset(prssdp, 0, sizeof(*prssdp));
1797         prssdp->order = PSF_ORDER_PRSSD;
1798         prssdp->suborder = PSF_SUBORDER_LCQ;    /* Logical Configuration Query */
1799
1800         ccw = cqr->cpaddr;
1801         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1802         ccw->count = sizeof(*prssdp);
1803         ccw->flags |= CCW_FLAG_CC;
1804         ccw->cda = (__u32)(addr_t)prssdp;
1805
1806         lcq = (struct dasd_rssd_lcq *)(prssdp + 1);
1807         memset(lcq, 0, sizeof(*lcq));
1808
1809         ccw++;
1810         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1811         ccw->count = sizeof(*lcq);
1812         ccw->flags |= CCW_FLAG_SLI;
1813         ccw->cda = (__u32)(addr_t)lcq;
1814
1815         cqr->buildclk = get_tod_clock();
1816         cqr->status = DASD_CQR_FILLED;
1817         cqr->startdev = device;
1818         cqr->memdev = device;
1819         cqr->block = NULL;
1820         cqr->retries = 256;
1821         cqr->expires = device->default_expires * HZ;
1822         /* The command might not be supported. Suppress the error output */
1823         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1824
1825         rc = dasd_sleep_on_interruptible(cqr);
1826         if (rc == 0) {
1827                 dasd_eckd_cpy_ext_pool_data(device, lcq);
1828         } else {
1829                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1830                                 "Reading the logical configuration failed with rc=%d", rc);
1831         }
1832
1833         dasd_sfree_request(cqr, cqr->memdev);
1834
1835         return rc;
1836 }
1837
1838 /*
1839  * Depending on the device type, the extent size is specified either as
1840  * cylinders per extent (CKD) or size per extent (FBA)
1841  * A 1GB size corresponds to 1113cyl, and 16MB to 21cyl.
1842  */
1843 static int dasd_eckd_ext_size(struct dasd_device *device)
1844 {
1845         struct dasd_eckd_private *private = device->private;
1846         struct dasd_ext_pool_sum eps = private->eps;
1847
1848         if (!eps.flags.extent_size_valid)
1849                 return 0;
1850         if (eps.extent_size.size_1G)
1851                 return 1113;
1852         if (eps.extent_size.size_16M)
1853                 return 21;
1854
1855         return 0;
1856 }
1857
1858 static int dasd_eckd_ext_pool_warn_thrshld(struct dasd_device *device)
1859 {
1860         struct dasd_eckd_private *private = device->private;
1861
1862         return private->eps.warn_thrshld;
1863 }
1864
1865 static int dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device *device)
1866 {
1867         struct dasd_eckd_private *private = device->private;
1868
1869         return private->eps.flags.capacity_at_warnlevel;
1870 }
1871
1872 /*
1873  * Extent Pool out of space
1874  */
1875 static int dasd_eckd_ext_pool_oos(struct dasd_device *device)
1876 {
1877         struct dasd_eckd_private *private = device->private;
1878
1879         return private->eps.flags.pool_oos;
1880 }
1881
1882 /*
1883  * Build CP for Perform Subsystem Function - SSC.
1884  */
1885 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1886                                                     int enable_pav)
1887 {
1888         struct dasd_ccw_req *cqr;
1889         struct dasd_psf_ssc_data *psf_ssc_data;
1890         struct ccw1 *ccw;
1891
1892         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1893                                   sizeof(struct dasd_psf_ssc_data),
1894                                    device, NULL);
1895
1896         if (IS_ERR(cqr)) {
1897                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1898                            "Could not allocate PSF-SSC request");
1899                 return cqr;
1900         }
1901         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1902         psf_ssc_data->order = PSF_ORDER_SSC;
1903         psf_ssc_data->suborder = 0xc0;
1904         if (enable_pav) {
1905                 psf_ssc_data->suborder |= 0x08;
1906                 psf_ssc_data->reserved[0] = 0x88;
1907         }
1908         ccw = cqr->cpaddr;
1909         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1910         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1911         ccw->count = 66;
1912
1913         cqr->startdev = device;
1914         cqr->memdev = device;
1915         cqr->block = NULL;
1916         cqr->retries = 256;
1917         cqr->expires = 10*HZ;
1918         cqr->buildclk = get_tod_clock();
1919         cqr->status = DASD_CQR_FILLED;
1920         return cqr;
1921 }
1922
1923 /*
1924  * Perform Subsystem Function.
1925  * It is necessary to trigger CIO for channel revalidation since this
1926  * call might change behaviour of DASD devices.
1927  */
1928 static int
1929 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1930                   unsigned long flags)
1931 {
1932         struct dasd_ccw_req *cqr;
1933         int rc;
1934
1935         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1936         if (IS_ERR(cqr))
1937                 return PTR_ERR(cqr);
1938
1939         /*
1940          * set flags e.g. turn on failfast, to prevent blocking
1941          * the calling function should handle failed requests
1942          */
1943         cqr->flags |= flags;
1944
1945         rc = dasd_sleep_on(cqr);
1946         if (!rc)
1947                 /* trigger CIO to reprobe devices */
1948                 css_schedule_reprobe();
1949         else if (cqr->intrc == -EAGAIN)
1950                 rc = -EAGAIN;
1951
1952         dasd_sfree_request(cqr, cqr->memdev);
1953         return rc;
1954 }
1955
1956 /*
1957  * Valide storage server of current device.
1958  */
1959 static int dasd_eckd_validate_server(struct dasd_device *device,
1960                                      unsigned long flags)
1961 {
1962         struct dasd_eckd_private *private = device->private;
1963         int enable_pav, rc;
1964
1965         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1966             private->uid.type == UA_HYPER_PAV_ALIAS)
1967                 return 0;
1968         if (dasd_nopav || MACHINE_IS_VM)
1969                 enable_pav = 0;
1970         else
1971                 enable_pav = 1;
1972         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1973
1974         /* may be requested feature is not available on server,
1975          * therefore just report error and go ahead */
1976         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1977                         "returned rc=%d", private->uid.ssid, rc);
1978         return rc;
1979 }
1980
1981 /*
1982  * worker to do a validate server in case of a lost pathgroup
1983  */
1984 static void dasd_eckd_do_validate_server(struct work_struct *work)
1985 {
1986         struct dasd_device *device = container_of(work, struct dasd_device,
1987                                                   kick_validate);
1988         unsigned long flags = 0;
1989
1990         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1991         if (dasd_eckd_validate_server(device, flags)
1992             == -EAGAIN) {
1993                 /* schedule worker again if failed */
1994                 schedule_work(&device->kick_validate);
1995                 return;
1996         }
1997
1998         dasd_put_device(device);
1999 }
2000
2001 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
2002 {
2003         dasd_get_device(device);
2004         /* exit if device not online or in offline processing */
2005         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
2006            device->state < DASD_STATE_ONLINE) {
2007                 dasd_put_device(device);
2008                 return;
2009         }
2010         /* queue call to do_validate_server to the kernel event daemon. */
2011         if (!schedule_work(&device->kick_validate))
2012                 dasd_put_device(device);
2013 }
2014
2015 /*
2016  * Check device characteristics.
2017  * If the device is accessible using ECKD discipline, the device is enabled.
2018  */
2019 static int
2020 dasd_eckd_check_characteristics(struct dasd_device *device)
2021 {
2022         struct dasd_eckd_private *private = device->private;
2023         struct dasd_block *block;
2024         struct dasd_uid temp_uid;
2025         int rc, i;
2026         int readonly;
2027         unsigned long value;
2028
2029         /* setup work queue for validate server*/
2030         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
2031         /* setup work queue for summary unit check */
2032         INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
2033
2034         if (!ccw_device_is_pathgroup(device->cdev)) {
2035                 dev_warn(&device->cdev->dev,
2036                          "A channel path group could not be established\n");
2037                 return -EIO;
2038         }
2039         if (!ccw_device_is_multipath(device->cdev)) {
2040                 dev_info(&device->cdev->dev,
2041                          "The DASD is not operating in multipath mode\n");
2042         }
2043         if (!private) {
2044                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
2045                 if (!private) {
2046                         dev_warn(&device->cdev->dev,
2047                                  "Allocating memory for private DASD data "
2048                                  "failed\n");
2049                         return -ENOMEM;
2050                 }
2051                 device->private = private;
2052         } else {
2053                 memset(private, 0, sizeof(*private));
2054         }
2055         /* Invalidate status of initial analysis. */
2056         private->init_cqr_status = -1;
2057         /* Set default cache operations. */
2058         private->attrib.operation = DASD_NORMAL_CACHE;
2059         private->attrib.nr_cyl = 0;
2060
2061         /* Read Configuration Data */
2062         rc = dasd_eckd_read_conf(device);
2063         if (rc)
2064                 goto out_err1;
2065
2066         /* set some default values */
2067         device->default_expires = DASD_EXPIRES;
2068         device->default_retries = DASD_RETRIES;
2069         device->path_thrhld = DASD_ECKD_PATH_THRHLD;
2070         device->path_interval = DASD_ECKD_PATH_INTERVAL;
2071
2072         if (private->conf.gneq) {
2073                 value = 1;
2074                 for (i = 0; i < private->conf.gneq->timeout.value; i++)
2075                         value = 10 * value;
2076                 value = value * private->conf.gneq->timeout.number;
2077                 /* do not accept useless values */
2078                 if (value != 0 && value <= DASD_EXPIRES_MAX)
2079                         device->default_expires = value;
2080         }
2081
2082         dasd_eckd_get_uid(device, &temp_uid);
2083         if (temp_uid.type == UA_BASE_DEVICE) {
2084                 block = dasd_alloc_block();
2085                 if (IS_ERR(block)) {
2086                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
2087                                         "could not allocate dasd "
2088                                         "block structure");
2089                         rc = PTR_ERR(block);
2090                         goto out_err1;
2091                 }
2092                 device->block = block;
2093                 block->base = device;
2094         }
2095
2096         /* register lcu with alias handling, enable PAV */
2097         rc = dasd_alias_make_device_known_to_lcu(device);
2098         if (rc)
2099                 goto out_err2;
2100
2101         dasd_eckd_validate_server(device, 0);
2102
2103         /* device may report different configuration data after LCU setup */
2104         rc = dasd_eckd_read_conf(device);
2105         if (rc)
2106                 goto out_err3;
2107
2108         dasd_eckd_read_fc_security(device);
2109         dasd_path_create_kobjects(device);
2110
2111         /* Read Feature Codes */
2112         dasd_eckd_read_features(device);
2113
2114         /* Read Volume Information */
2115         dasd_eckd_read_vol_info(device);
2116
2117         /* Read Extent Pool Information */
2118         dasd_eckd_read_ext_pool_info(device);
2119
2120         /* Read Device Characteristics */
2121         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
2122                                          &private->rdc_data, 64);
2123         if (rc) {
2124                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2125                                 "Read device characteristic failed, rc=%d", rc);
2126                 goto out_err3;
2127         }
2128
2129         if ((device->features & DASD_FEATURE_USERAW) &&
2130             !(private->rdc_data.facilities.RT_in_LR)) {
2131                 dev_err(&device->cdev->dev, "The storage server does not "
2132                         "support raw-track access\n");
2133                 rc = -EINVAL;
2134                 goto out_err3;
2135         }
2136
2137         /* find the valid cylinder size */
2138         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
2139             private->rdc_data.long_no_cyl)
2140                 private->real_cyl = private->rdc_data.long_no_cyl;
2141         else
2142                 private->real_cyl = private->rdc_data.no_cyl;
2143
2144         private->fcx_max_data = get_fcx_max_data(device);
2145
2146         readonly = dasd_device_is_ro(device);
2147         if (readonly)
2148                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
2149
2150         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
2151                  "with %d cylinders, %d heads, %d sectors%s\n",
2152                  private->rdc_data.dev_type,
2153                  private->rdc_data.dev_model,
2154                  private->rdc_data.cu_type,
2155                  private->rdc_data.cu_model.model,
2156                  private->real_cyl,
2157                  private->rdc_data.trk_per_cyl,
2158                  private->rdc_data.sec_per_trk,
2159                  readonly ? ", read-only device" : "");
2160         return 0;
2161
2162 out_err3:
2163         dasd_alias_disconnect_device_from_lcu(device);
2164 out_err2:
2165         dasd_free_block(device->block);
2166         device->block = NULL;
2167 out_err1:
2168         dasd_eckd_clear_conf_data(device);
2169         dasd_path_remove_kobjects(device);
2170         kfree(device->private);
2171         device->private = NULL;
2172         return rc;
2173 }
2174
2175 static void dasd_eckd_uncheck_device(struct dasd_device *device)
2176 {
2177         struct dasd_eckd_private *private = device->private;
2178
2179         if (!private)
2180                 return;
2181
2182         dasd_alias_disconnect_device_from_lcu(device);
2183         private->conf.ned = NULL;
2184         private->conf.sneq = NULL;
2185         private->conf.vdsneq = NULL;
2186         private->conf.gneq = NULL;
2187         dasd_eckd_clear_conf_data(device);
2188         dasd_path_remove_kobjects(device);
2189 }
2190
2191 static struct dasd_ccw_req *
2192 dasd_eckd_analysis_ccw(struct dasd_device *device)
2193 {
2194         struct dasd_eckd_private *private = device->private;
2195         struct eckd_count *count_data;
2196         struct LO_eckd_data *LO_data;
2197         struct dasd_ccw_req *cqr;
2198         struct ccw1 *ccw;
2199         int cplength, datasize;
2200         int i;
2201
2202         cplength = 8;
2203         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
2204         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
2205                                    NULL);
2206         if (IS_ERR(cqr))
2207                 return cqr;
2208         ccw = cqr->cpaddr;
2209         /* Define extent for the first 2 tracks. */
2210         define_extent(ccw++, cqr->data, 0, 1,
2211                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2212         LO_data = cqr->data + sizeof(struct DE_eckd_data);
2213         /* Locate record for the first 4 records on track 0. */
2214         ccw[-1].flags |= CCW_FLAG_CC;
2215         locate_record(ccw++, LO_data++, 0, 0, 4,
2216                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2217
2218         count_data = private->count_area;
2219         for (i = 0; i < 4; i++) {
2220                 ccw[-1].flags |= CCW_FLAG_CC;
2221                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2222                 ccw->flags = 0;
2223                 ccw->count = 8;
2224                 ccw->cda = (__u32)(addr_t) count_data;
2225                 ccw++;
2226                 count_data++;
2227         }
2228
2229         /* Locate record for the first record on track 1. */
2230         ccw[-1].flags |= CCW_FLAG_CC;
2231         locate_record(ccw++, LO_data++, 1, 0, 1,
2232                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2233         /* Read count ccw. */
2234         ccw[-1].flags |= CCW_FLAG_CC;
2235         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2236         ccw->flags = 0;
2237         ccw->count = 8;
2238         ccw->cda = (__u32)(addr_t) count_data;
2239
2240         cqr->block = NULL;
2241         cqr->startdev = device;
2242         cqr->memdev = device;
2243         cqr->retries = 255;
2244         cqr->buildclk = get_tod_clock();
2245         cqr->status = DASD_CQR_FILLED;
2246         /* Set flags to suppress output for expected errors */
2247         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2248
2249         return cqr;
2250 }
2251
2252 /* differentiate between 'no record found' and any other error */
2253 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
2254 {
2255         char *sense;
2256         if (init_cqr->status == DASD_CQR_DONE)
2257                 return INIT_CQR_OK;
2258         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
2259                  init_cqr->status == DASD_CQR_FAILED) {
2260                 sense = dasd_get_sense(&init_cqr->irb);
2261                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
2262                         return INIT_CQR_UNFORMATTED;
2263                 else
2264                         return INIT_CQR_ERROR;
2265         } else
2266                 return INIT_CQR_ERROR;
2267 }
2268
2269 /*
2270  * This is the callback function for the init_analysis cqr. It saves
2271  * the status of the initial analysis ccw before it frees it and kicks
2272  * the device to continue the startup sequence. This will call
2273  * dasd_eckd_do_analysis again (if the devices has not been marked
2274  * for deletion in the meantime).
2275  */
2276 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
2277                                         void *data)
2278 {
2279         struct dasd_device *device = init_cqr->startdev;
2280         struct dasd_eckd_private *private = device->private;
2281
2282         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
2283         dasd_sfree_request(init_cqr, device);
2284         dasd_kick_device(device);
2285 }
2286
2287 static int dasd_eckd_start_analysis(struct dasd_block *block)
2288 {
2289         struct dasd_ccw_req *init_cqr;
2290
2291         init_cqr = dasd_eckd_analysis_ccw(block->base);
2292         if (IS_ERR(init_cqr))
2293                 return PTR_ERR(init_cqr);
2294         init_cqr->callback = dasd_eckd_analysis_callback;
2295         init_cqr->callback_data = NULL;
2296         init_cqr->expires = 5*HZ;
2297         /* first try without ERP, so we can later handle unformatted
2298          * devices as special case
2299          */
2300         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
2301         init_cqr->retries = 0;
2302         dasd_add_request_head(init_cqr);
2303         return -EAGAIN;
2304 }
2305
2306 static int dasd_eckd_end_analysis(struct dasd_block *block)
2307 {
2308         struct dasd_device *device = block->base;
2309         struct dasd_eckd_private *private = device->private;
2310         struct eckd_count *count_area;
2311         unsigned int sb, blk_per_trk;
2312         int status, i;
2313         struct dasd_ccw_req *init_cqr;
2314
2315         status = private->init_cqr_status;
2316         private->init_cqr_status = -1;
2317         if (status == INIT_CQR_ERROR) {
2318                 /* try again, this time with full ERP */
2319                 init_cqr = dasd_eckd_analysis_ccw(device);
2320                 dasd_sleep_on(init_cqr);
2321                 status = dasd_eckd_analysis_evaluation(init_cqr);
2322                 dasd_sfree_request(init_cqr, device);
2323         }
2324
2325         if (device->features & DASD_FEATURE_USERAW) {
2326                 block->bp_block = DASD_RAW_BLOCKSIZE;
2327                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
2328                 block->s2b_shift = 3;
2329                 goto raw;
2330         }
2331
2332         if (status == INIT_CQR_UNFORMATTED) {
2333                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2334                 return -EMEDIUMTYPE;
2335         } else if (status == INIT_CQR_ERROR) {
2336                 dev_err(&device->cdev->dev,
2337                         "Detecting the DASD disk layout failed because "
2338                         "of an I/O error\n");
2339                 return -EIO;
2340         }
2341
2342         private->uses_cdl = 1;
2343         /* Check Track 0 for Compatible Disk Layout */
2344         count_area = NULL;
2345         for (i = 0; i < 3; i++) {
2346                 if (private->count_area[i].kl != 4 ||
2347                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2348                     private->count_area[i].cyl != 0 ||
2349                     private->count_area[i].head != count_area_head[i] ||
2350                     private->count_area[i].record != count_area_rec[i]) {
2351                         private->uses_cdl = 0;
2352                         break;
2353                 }
2354         }
2355         if (i == 3)
2356                 count_area = &private->count_area[3];
2357
2358         if (private->uses_cdl == 0) {
2359                 for (i = 0; i < 5; i++) {
2360                         if ((private->count_area[i].kl != 0) ||
2361                             (private->count_area[i].dl !=
2362                              private->count_area[0].dl) ||
2363                             private->count_area[i].cyl !=  0 ||
2364                             private->count_area[i].head != count_area_head[i] ||
2365                             private->count_area[i].record != count_area_rec[i])
2366                                 break;
2367                 }
2368                 if (i == 5)
2369                         count_area = &private->count_area[0];
2370         } else {
2371                 if (private->count_area[3].record == 1)
2372                         dev_warn(&device->cdev->dev,
2373                                  "Track 0 has no records following the VTOC\n");
2374         }
2375
2376         if (count_area != NULL && count_area->kl == 0) {
2377                 /* we found notthing violating our disk layout */
2378                 if (dasd_check_blocksize(count_area->dl) == 0)
2379                         block->bp_block = count_area->dl;
2380         }
2381         if (block->bp_block == 0) {
2382                 dev_warn(&device->cdev->dev,
2383                          "The disk layout of the DASD is not supported\n");
2384                 return -EMEDIUMTYPE;
2385         }
2386         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2387         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2388                 block->s2b_shift++;
2389
2390         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2391
2392 raw:
2393         block->blocks = ((unsigned long) private->real_cyl *
2394                           private->rdc_data.trk_per_cyl *
2395                           blk_per_trk);
2396
2397         dev_info(&device->cdev->dev,
2398                  "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2399                  "%s\n", (block->bp_block >> 10),
2400                  (((unsigned long) private->real_cyl *
2401                    private->rdc_data.trk_per_cyl *
2402                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2403                  ((blk_per_trk * block->bp_block) >> 10),
2404                  private->uses_cdl ?
2405                  "compatible disk layout" : "linux disk layout");
2406
2407         return 0;
2408 }
2409
2410 static int dasd_eckd_do_analysis(struct dasd_block *block)
2411 {
2412         struct dasd_eckd_private *private = block->base->private;
2413
2414         if (private->init_cqr_status < 0)
2415                 return dasd_eckd_start_analysis(block);
2416         else
2417                 return dasd_eckd_end_analysis(block);
2418 }
2419
2420 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2421 {
2422         return dasd_alias_add_device(device);
2423 };
2424
2425 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2426 {
2427         if (cancel_work_sync(&device->reload_device))
2428                 dasd_put_device(device);
2429         if (cancel_work_sync(&device->kick_validate))
2430                 dasd_put_device(device);
2431
2432         return 0;
2433 };
2434
2435 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2436 {
2437         return dasd_alias_remove_device(device);
2438 };
2439
2440 static int
2441 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2442 {
2443         struct dasd_eckd_private *private = block->base->private;
2444
2445         if (dasd_check_blocksize(block->bp_block) == 0) {
2446                 geo->sectors = recs_per_track(&private->rdc_data,
2447                                               0, block->bp_block);
2448         }
2449         geo->cylinders = private->rdc_data.no_cyl;
2450         geo->heads = private->rdc_data.trk_per_cyl;
2451         return 0;
2452 }
2453
2454 /*
2455  * Build the TCW request for the format check
2456  */
2457 static struct dasd_ccw_req *
2458 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2459                           int enable_pav, struct eckd_count *fmt_buffer,
2460                           int rpt)
2461 {
2462         struct dasd_eckd_private *start_priv;
2463         struct dasd_device *startdev = NULL;
2464         struct tidaw *last_tidaw = NULL;
2465         struct dasd_ccw_req *cqr;
2466         struct itcw *itcw;
2467         int itcw_size;
2468         int count;
2469         int rc;
2470         int i;
2471
2472         if (enable_pav)
2473                 startdev = dasd_alias_get_start_dev(base);
2474
2475         if (!startdev)
2476                 startdev = base;
2477
2478         start_priv = startdev->private;
2479
2480         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2481
2482         /*
2483          * we're adding 'count' amount of tidaw to the itcw.
2484          * calculate the corresponding itcw_size
2485          */
2486         itcw_size = itcw_calc_size(0, count, 0);
2487
2488         cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2489         if (IS_ERR(cqr))
2490                 return cqr;
2491
2492         start_priv->count++;
2493
2494         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2495         if (IS_ERR(itcw)) {
2496                 rc = -EINVAL;
2497                 goto out_err;
2498         }
2499
2500         cqr->cpaddr = itcw_get_tcw(itcw);
2501         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2502                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2503                           sizeof(struct eckd_count),
2504                           count * sizeof(struct eckd_count), 0, rpt);
2505         if (rc)
2506                 goto out_err;
2507
2508         for (i = 0; i < count; i++) {
2509                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2510                                             sizeof(struct eckd_count));
2511                 if (IS_ERR(last_tidaw)) {
2512                         rc = -EINVAL;
2513                         goto out_err;
2514                 }
2515         }
2516
2517         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2518         itcw_finalize(itcw);
2519
2520         cqr->cpmode = 1;
2521         cqr->startdev = startdev;
2522         cqr->memdev = startdev;
2523         cqr->basedev = base;
2524         cqr->retries = startdev->default_retries;
2525         cqr->expires = startdev->default_expires * HZ;
2526         cqr->buildclk = get_tod_clock();
2527         cqr->status = DASD_CQR_FILLED;
2528         /* Set flags to suppress output for expected errors */
2529         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2530         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2531
2532         return cqr;
2533
2534 out_err:
2535         dasd_sfree_request(cqr, startdev);
2536
2537         return ERR_PTR(rc);
2538 }
2539
2540 /*
2541  * Build the CCW request for the format check
2542  */
2543 static struct dasd_ccw_req *
2544 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2545                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2546 {
2547         struct dasd_eckd_private *start_priv;
2548         struct dasd_eckd_private *base_priv;
2549         struct dasd_device *startdev = NULL;
2550         struct dasd_ccw_req *cqr;
2551         struct ccw1 *ccw;
2552         void *data;
2553         int cplength, datasize;
2554         int use_prefix;
2555         int count;
2556         int i;
2557
2558         if (enable_pav)
2559                 startdev = dasd_alias_get_start_dev(base);
2560
2561         if (!startdev)
2562                 startdev = base;
2563
2564         start_priv = startdev->private;
2565         base_priv = base->private;
2566
2567         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2568
2569         use_prefix = base_priv->features.feature[8] & 0x01;
2570
2571         if (use_prefix) {
2572                 cplength = 1;
2573                 datasize = sizeof(struct PFX_eckd_data);
2574         } else {
2575                 cplength = 2;
2576                 datasize = sizeof(struct DE_eckd_data) +
2577                         sizeof(struct LO_eckd_data);
2578         }
2579         cplength += count;
2580
2581         cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2582         if (IS_ERR(cqr))
2583                 return cqr;
2584
2585         start_priv->count++;
2586         data = cqr->data;
2587         ccw = cqr->cpaddr;
2588
2589         if (use_prefix) {
2590                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2591                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2592                            count, 0, 0);
2593         } else {
2594                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2595                               DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2596
2597                 data += sizeof(struct DE_eckd_data);
2598                 ccw[-1].flags |= CCW_FLAG_CC;
2599
2600                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2601                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2602         }
2603
2604         for (i = 0; i < count; i++) {
2605                 ccw[-1].flags |= CCW_FLAG_CC;
2606                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2607                 ccw->flags = CCW_FLAG_SLI;
2608                 ccw->count = 8;
2609                 ccw->cda = (__u32)(addr_t) fmt_buffer;
2610                 ccw++;
2611                 fmt_buffer++;
2612         }
2613
2614         cqr->startdev = startdev;
2615         cqr->memdev = startdev;
2616         cqr->basedev = base;
2617         cqr->retries = DASD_RETRIES;
2618         cqr->expires = startdev->default_expires * HZ;
2619         cqr->buildclk = get_tod_clock();
2620         cqr->status = DASD_CQR_FILLED;
2621         /* Set flags to suppress output for expected errors */
2622         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2623
2624         return cqr;
2625 }
2626
2627 static struct dasd_ccw_req *
2628 dasd_eckd_build_format(struct dasd_device *base, struct dasd_device *startdev,
2629                        struct format_data_t *fdata, int enable_pav)
2630 {
2631         struct dasd_eckd_private *base_priv;
2632         struct dasd_eckd_private *start_priv;
2633         struct dasd_ccw_req *fcp;
2634         struct eckd_count *ect;
2635         struct ch_t address;
2636         struct ccw1 *ccw;
2637         void *data;
2638         int rpt;
2639         int cplength, datasize;
2640         int i, j;
2641         int intensity = 0;
2642         int r0_perm;
2643         int nr_tracks;
2644         int use_prefix;
2645
2646         if (enable_pav)
2647                 startdev = dasd_alias_get_start_dev(base);
2648
2649         if (!startdev)
2650                 startdev = base;
2651
2652         start_priv = startdev->private;
2653         base_priv = base->private;
2654
2655         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2656
2657         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2658
2659         /*
2660          * fdata->intensity is a bit string that tells us what to do:
2661          *   Bit 0: write record zero
2662          *   Bit 1: write home address, currently not supported
2663          *   Bit 2: invalidate tracks
2664          *   Bit 3: use OS/390 compatible disk layout (cdl)
2665          *   Bit 4: do not allow storage subsystem to modify record zero
2666          * Only some bit combinations do make sense.
2667          */
2668         if (fdata->intensity & 0x10) {
2669                 r0_perm = 0;
2670                 intensity = fdata->intensity & ~0x10;
2671         } else {
2672                 r0_perm = 1;
2673                 intensity = fdata->intensity;
2674         }
2675
2676         use_prefix = base_priv->features.feature[8] & 0x01;
2677
2678         switch (intensity) {
2679         case 0x00:      /* Normal format */
2680         case 0x08:      /* Normal format, use cdl. */
2681                 cplength = 2 + (rpt*nr_tracks);
2682                 if (use_prefix)
2683                         datasize = sizeof(struct PFX_eckd_data) +
2684                                 sizeof(struct LO_eckd_data) +
2685                                 rpt * nr_tracks * sizeof(struct eckd_count);
2686                 else
2687                         datasize = sizeof(struct DE_eckd_data) +
2688                                 sizeof(struct LO_eckd_data) +
2689                                 rpt * nr_tracks * sizeof(struct eckd_count);
2690                 break;
2691         case 0x01:      /* Write record zero and format track. */
2692         case 0x09:      /* Write record zero and format track, use cdl. */
2693                 cplength = 2 + rpt * nr_tracks;
2694                 if (use_prefix)
2695                         datasize = sizeof(struct PFX_eckd_data) +
2696                                 sizeof(struct LO_eckd_data) +
2697                                 sizeof(struct eckd_count) +
2698                                 rpt * nr_tracks * sizeof(struct eckd_count);
2699                 else
2700                         datasize = sizeof(struct DE_eckd_data) +
2701                                 sizeof(struct LO_eckd_data) +
2702                                 sizeof(struct eckd_count) +
2703                                 rpt * nr_tracks * sizeof(struct eckd_count);
2704                 break;
2705         case 0x04:      /* Invalidate track. */
2706         case 0x0c:      /* Invalidate track, use cdl. */
2707                 cplength = 3;
2708                 if (use_prefix)
2709                         datasize = sizeof(struct PFX_eckd_data) +
2710                                 sizeof(struct LO_eckd_data) +
2711                                 sizeof(struct eckd_count);
2712                 else
2713                         datasize = sizeof(struct DE_eckd_data) +
2714                                 sizeof(struct LO_eckd_data) +
2715                                 sizeof(struct eckd_count);
2716                 break;
2717         default:
2718                 dev_warn(&startdev->cdev->dev,
2719                          "An I/O control call used incorrect flags 0x%x\n",
2720                          fdata->intensity);
2721                 return ERR_PTR(-EINVAL);
2722         }
2723
2724         fcp = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2725         if (IS_ERR(fcp))
2726                 return fcp;
2727
2728         start_priv->count++;
2729         data = fcp->data;
2730         ccw = fcp->cpaddr;
2731
2732         switch (intensity & ~0x08) {
2733         case 0x00: /* Normal format. */
2734                 if (use_prefix) {
2735                         prefix(ccw++, (struct PFX_eckd_data *) data,
2736                                fdata->start_unit, fdata->stop_unit,
2737                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2738                         /* grant subsystem permission to format R0 */
2739                         if (r0_perm)
2740                                 ((struct PFX_eckd_data *)data)
2741                                         ->define_extent.ga_extended |= 0x04;
2742                         data += sizeof(struct PFX_eckd_data);
2743                 } else {
2744                         define_extent(ccw++, (struct DE_eckd_data *) data,
2745                                       fdata->start_unit, fdata->stop_unit,
2746                                       DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2747                         /* grant subsystem permission to format R0 */
2748                         if (r0_perm)
2749                                 ((struct DE_eckd_data *) data)
2750                                         ->ga_extended |= 0x04;
2751                         data += sizeof(struct DE_eckd_data);
2752                 }
2753                 ccw[-1].flags |= CCW_FLAG_CC;
2754                 locate_record(ccw++, (struct LO_eckd_data *) data,
2755                               fdata->start_unit, 0, rpt*nr_tracks,
2756                               DASD_ECKD_CCW_WRITE_CKD, base,
2757                               fdata->blksize);
2758                 data += sizeof(struct LO_eckd_data);
2759                 break;
2760         case 0x01: /* Write record zero + format track. */
2761                 if (use_prefix) {
2762                         prefix(ccw++, (struct PFX_eckd_data *) data,
2763                                fdata->start_unit, fdata->stop_unit,
2764                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2765                                base, startdev);
2766                         data += sizeof(struct PFX_eckd_data);
2767                 } else {
2768                         define_extent(ccw++, (struct DE_eckd_data *) data,
2769                                fdata->start_unit, fdata->stop_unit,
2770                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2771                         data += sizeof(struct DE_eckd_data);
2772                 }
2773                 ccw[-1].flags |= CCW_FLAG_CC;
2774                 locate_record(ccw++, (struct LO_eckd_data *) data,
2775                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2776                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2777                               base->block->bp_block);
2778                 data += sizeof(struct LO_eckd_data);
2779                 break;
2780         case 0x04: /* Invalidate track. */
2781                 if (use_prefix) {
2782                         prefix(ccw++, (struct PFX_eckd_data *) data,
2783                                fdata->start_unit, fdata->stop_unit,
2784                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2785                         data += sizeof(struct PFX_eckd_data);
2786                 } else {
2787                         define_extent(ccw++, (struct DE_eckd_data *) data,
2788                                fdata->start_unit, fdata->stop_unit,
2789                                DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2790                         data += sizeof(struct DE_eckd_data);
2791                 }
2792                 ccw[-1].flags |= CCW_FLAG_CC;
2793                 locate_record(ccw++, (struct LO_eckd_data *) data,
2794                               fdata->start_unit, 0, 1,
2795                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2796                 data += sizeof(struct LO_eckd_data);
2797                 break;
2798         }
2799
2800         for (j = 0; j < nr_tracks; j++) {
2801                 /* calculate cylinder and head for the current track */
2802                 set_ch_t(&address,
2803                          (fdata->start_unit + j) /
2804                          base_priv->rdc_data.trk_per_cyl,
2805                          (fdata->start_unit + j) %
2806                          base_priv->rdc_data.trk_per_cyl);
2807                 if (intensity & 0x01) { /* write record zero */
2808                         ect = (struct eckd_count *) data;
2809                         data += sizeof(struct eckd_count);
2810                         ect->cyl = address.cyl;
2811                         ect->head = address.head;
2812                         ect->record = 0;
2813                         ect->kl = 0;
2814                         ect->dl = 8;
2815                         ccw[-1].flags |= CCW_FLAG_CC;
2816                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2817                         ccw->flags = CCW_FLAG_SLI;
2818                         ccw->count = 8;
2819                         ccw->cda = (__u32)(addr_t) ect;
2820                         ccw++;
2821                 }
2822                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2823                         ect = (struct eckd_count *) data;
2824                         data += sizeof(struct eckd_count);
2825                         ect->cyl = address.cyl;
2826                         ect->head = address.head;
2827                         ect->record = 1;
2828                         ect->kl = 0;
2829                         ect->dl = 0;
2830                         ccw[-1].flags |= CCW_FLAG_CC;
2831                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2832                         ccw->flags = CCW_FLAG_SLI;
2833                         ccw->count = 8;
2834                         ccw->cda = (__u32)(addr_t) ect;
2835                 } else {                /* write remaining records */
2836                         for (i = 0; i < rpt; i++) {
2837                                 ect = (struct eckd_count *) data;
2838                                 data += sizeof(struct eckd_count);
2839                                 ect->cyl = address.cyl;
2840                                 ect->head = address.head;
2841                                 ect->record = i + 1;
2842                                 ect->kl = 0;
2843                                 ect->dl = fdata->blksize;
2844                                 /*
2845                                  * Check for special tracks 0-1
2846                                  * when formatting CDL
2847                                  */
2848                                 if ((intensity & 0x08) &&
2849                                     address.cyl == 0 && address.head == 0) {
2850                                         if (i < 3) {
2851                                                 ect->kl = 4;
2852                                                 ect->dl = sizes_trk0[i] - 4;
2853                                         }
2854                                 }
2855                                 if ((intensity & 0x08) &&
2856                                     address.cyl == 0 && address.head == 1) {
2857                                         ect->kl = 44;
2858                                         ect->dl = LABEL_SIZE - 44;
2859                                 }
2860                                 ccw[-1].flags |= CCW_FLAG_CC;
2861                                 if (i != 0 || j == 0)
2862                                         ccw->cmd_code =
2863                                                 DASD_ECKD_CCW_WRITE_CKD;
2864                                 else
2865                                         ccw->cmd_code =
2866                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2867                                 ccw->flags = CCW_FLAG_SLI;
2868                                 ccw->count = 8;
2869                                 ccw->cda = (__u32)(addr_t) ect;
2870                                 ccw++;
2871                         }
2872                 }
2873         }
2874
2875         fcp->startdev = startdev;
2876         fcp->memdev = startdev;
2877         fcp->basedev = base;
2878         fcp->retries = 256;
2879         fcp->expires = startdev->default_expires * HZ;
2880         fcp->buildclk = get_tod_clock();
2881         fcp->status = DASD_CQR_FILLED;
2882
2883         return fcp;
2884 }
2885
2886 /*
2887  * Wrapper function to build a CCW request depending on input data
2888  */
2889 static struct dasd_ccw_req *
2890 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2891                                struct format_data_t *fdata, int enable_pav,
2892                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2893 {
2894         struct dasd_ccw_req *ccw_req;
2895
2896         if (!fmt_buffer) {
2897                 ccw_req = dasd_eckd_build_format(base, NULL, fdata, enable_pav);
2898         } else {
2899                 if (tpm)
2900                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2901                                                             enable_pav,
2902                                                             fmt_buffer, rpt);
2903                 else
2904                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2905                                                         fmt_buffer, rpt);
2906         }
2907
2908         return ccw_req;
2909 }
2910
2911 /*
2912  * Sanity checks on format_data
2913  */
2914 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2915                                           struct format_data_t *fdata)
2916 {
2917         struct dasd_eckd_private *private = base->private;
2918
2919         if (fdata->start_unit >=
2920             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2921                 dev_warn(&base->cdev->dev,
2922                          "Start track number %u used in formatting is too big\n",
2923                          fdata->start_unit);
2924                 return -EINVAL;
2925         }
2926         if (fdata->stop_unit >=
2927             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2928                 dev_warn(&base->cdev->dev,
2929                          "Stop track number %u used in formatting is too big\n",
2930                          fdata->stop_unit);
2931                 return -EINVAL;
2932         }
2933         if (fdata->start_unit > fdata->stop_unit) {
2934                 dev_warn(&base->cdev->dev,
2935                          "Start track %u used in formatting exceeds end track\n",
2936                          fdata->start_unit);
2937                 return -EINVAL;
2938         }
2939         if (dasd_check_blocksize(fdata->blksize) != 0) {
2940                 dev_warn(&base->cdev->dev,
2941                          "The DASD cannot be formatted with block size %u\n",
2942                          fdata->blksize);
2943                 return -EINVAL;
2944         }
2945         return 0;
2946 }
2947
2948 /*
2949  * This function will process format_data originally coming from an IOCTL
2950  */
2951 static int dasd_eckd_format_process_data(struct dasd_device *base,
2952                                          struct format_data_t *fdata,
2953                                          int enable_pav, int tpm,
2954                                          struct eckd_count *fmt_buffer, int rpt,
2955                                          struct irb *irb)
2956 {
2957         struct dasd_eckd_private *private = base->private;
2958         struct dasd_ccw_req *cqr, *n;
2959         struct list_head format_queue;
2960         struct dasd_device *device;
2961         char *sense = NULL;
2962         int old_start, old_stop, format_step;
2963         int step, retry;
2964         int rc;
2965
2966         rc = dasd_eckd_format_sanity_checks(base, fdata);
2967         if (rc)
2968                 return rc;
2969
2970         INIT_LIST_HEAD(&format_queue);
2971
2972         old_start = fdata->start_unit;
2973         old_stop = fdata->stop_unit;
2974
2975         if (!tpm && fmt_buffer != NULL) {
2976                 /* Command Mode / Format Check */
2977                 format_step = 1;
2978         } else if (tpm && fmt_buffer != NULL) {
2979                 /* Transport Mode / Format Check */
2980                 format_step = DASD_CQR_MAX_CCW / rpt;
2981         } else {
2982                 /* Normal Formatting */
2983                 format_step = DASD_CQR_MAX_CCW /
2984                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
2985         }
2986
2987         do {
2988                 retry = 0;
2989                 while (fdata->start_unit <= old_stop) {
2990                         step = fdata->stop_unit - fdata->start_unit + 1;
2991                         if (step > format_step) {
2992                                 fdata->stop_unit =
2993                                         fdata->start_unit + format_step - 1;
2994                         }
2995
2996                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2997                                                              enable_pav, tpm,
2998                                                              fmt_buffer, rpt);
2999                         if (IS_ERR(cqr)) {
3000                                 rc = PTR_ERR(cqr);
3001                                 if (rc == -ENOMEM) {
3002                                         if (list_empty(&format_queue))
3003                                                 goto out;
3004                                         /*
3005                                          * not enough memory available, start
3006                                          * requests retry after first requests
3007                                          * were finished
3008                                          */
3009                                         retry = 1;
3010                                         break;
3011                                 }
3012                                 goto out_err;
3013                         }
3014                         list_add_tail(&cqr->blocklist, &format_queue);
3015
3016                         if (fmt_buffer) {
3017                                 step = fdata->stop_unit - fdata->start_unit + 1;
3018                                 fmt_buffer += rpt * step;
3019                         }
3020                         fdata->start_unit = fdata->stop_unit + 1;
3021                         fdata->stop_unit = old_stop;
3022                 }
3023
3024                 rc = dasd_sleep_on_queue(&format_queue);
3025
3026 out_err:
3027                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
3028                         device = cqr->startdev;
3029                         private = device->private;
3030
3031                         if (cqr->status == DASD_CQR_FAILED) {
3032                                 /*
3033                                  * Only get sense data if called by format
3034                                  * check
3035                                  */
3036                                 if (fmt_buffer && irb) {
3037                                         sense = dasd_get_sense(&cqr->irb);
3038                                         memcpy(irb, &cqr->irb, sizeof(*irb));
3039                                 }
3040                                 rc = -EIO;
3041                         }
3042                         list_del_init(&cqr->blocklist);
3043                         dasd_ffree_request(cqr, device);
3044                         private->count--;
3045                 }
3046
3047                 if (rc && rc != -EIO)
3048                         goto out;
3049                 if (rc == -EIO) {
3050                         /*
3051                          * In case fewer than the expected records are on the
3052                          * track, we will most likely get a 'No Record Found'
3053                          * error (in command mode) or a 'File Protected' error
3054                          * (in transport mode). Those particular cases shouldn't
3055                          * pass the -EIO to the IOCTL, therefore reset the rc
3056                          * and continue.
3057                          */
3058                         if (sense &&
3059                             (sense[1] & SNS1_NO_REC_FOUND ||
3060                              sense[1] & SNS1_FILE_PROTECTED))
3061                                 retry = 1;
3062                         else
3063                                 goto out;
3064                 }
3065
3066         } while (retry);
3067
3068 out:
3069         fdata->start_unit = old_start;
3070         fdata->stop_unit = old_stop;
3071
3072         return rc;
3073 }
3074
3075 static int dasd_eckd_format_device(struct dasd_device *base,
3076                                    struct format_data_t *fdata, int enable_pav)
3077 {
3078         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
3079                                              0, NULL);
3080 }
3081
3082 static bool test_and_set_format_track(struct dasd_format_entry *to_format,
3083                                       struct dasd_ccw_req *cqr)
3084 {
3085         struct dasd_block *block = cqr->block;
3086         struct dasd_format_entry *format;
3087         unsigned long flags;
3088         bool rc = false;
3089
3090         spin_lock_irqsave(&block->format_lock, flags);
3091         if (cqr->trkcount != atomic_read(&block->trkcount)) {
3092                 /*
3093                  * The number of formatted tracks has changed after request
3094                  * start and we can not tell if the current track was involved.
3095                  * To avoid data corruption treat it as if the current track is
3096                  * involved
3097                  */
3098                 rc = true;
3099                 goto out;
3100         }
3101         list_for_each_entry(format, &block->format_list, list) {
3102                 if (format->track == to_format->track) {
3103                         rc = true;
3104                         goto out;
3105                 }
3106         }
3107         list_add_tail(&to_format->list, &block->format_list);
3108
3109 out:
3110         spin_unlock_irqrestore(&block->format_lock, flags);
3111         return rc;
3112 }
3113
3114 static void clear_format_track(struct dasd_format_entry *format,
3115                               struct dasd_block *block)
3116 {
3117         unsigned long flags;
3118
3119         spin_lock_irqsave(&block->format_lock, flags);
3120         atomic_inc(&block->trkcount);
3121         list_del_init(&format->list);
3122         spin_unlock_irqrestore(&block->format_lock, flags);
3123 }
3124
3125 /*
3126  * Callback function to free ESE format requests.
3127  */
3128 static void dasd_eckd_ese_format_cb(struct dasd_ccw_req *cqr, void *data)
3129 {
3130         struct dasd_device *device = cqr->startdev;
3131         struct dasd_eckd_private *private = device->private;
3132         struct dasd_format_entry *format = data;
3133
3134         clear_format_track(format, cqr->basedev->block);
3135         private->count--;
3136         dasd_ffree_request(cqr, device);
3137 }
3138
3139 static struct dasd_ccw_req *
3140 dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr,
3141                      struct irb *irb)
3142 {
3143         struct dasd_eckd_private *private;
3144         struct dasd_format_entry *format;
3145         struct format_data_t fdata;
3146         unsigned int recs_per_trk;
3147         struct dasd_ccw_req *fcqr;
3148         struct dasd_device *base;
3149         struct dasd_block *block;
3150         unsigned int blksize;
3151         struct request *req;
3152         sector_t first_trk;
3153         sector_t last_trk;
3154         sector_t curr_trk;
3155         int rc;
3156
3157         req = dasd_get_callback_data(cqr);
3158         block = cqr->block;
3159         base = block->base;
3160         private = base->private;
3161         blksize = block->bp_block;
3162         recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3163         format = &startdev->format_entry;
3164
3165         first_trk = blk_rq_pos(req) >> block->s2b_shift;
3166         sector_div(first_trk, recs_per_trk);
3167         last_trk =
3168                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3169         sector_div(last_trk, recs_per_trk);
3170         rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3171         if (rc)
3172                 return ERR_PTR(rc);
3173
3174         if (curr_trk < first_trk || curr_trk > last_trk) {
3175                 DBF_DEV_EVENT(DBF_WARNING, startdev,
3176                               "ESE error track %llu not within range %llu - %llu\n",
3177                               curr_trk, first_trk, last_trk);
3178                 return ERR_PTR(-EINVAL);
3179         }
3180         format->track = curr_trk;
3181         /* test if track is already in formatting by another thread */
3182         if (test_and_set_format_track(format, cqr)) {
3183                 /* this is no real error so do not count down retries */
3184                 cqr->retries++;
3185                 return ERR_PTR(-EEXIST);
3186         }
3187
3188         fdata.start_unit = curr_trk;
3189         fdata.stop_unit = curr_trk;
3190         fdata.blksize = blksize;
3191         fdata.intensity = private->uses_cdl ? DASD_FMT_INT_COMPAT : 0;
3192
3193         rc = dasd_eckd_format_sanity_checks(base, &fdata);
3194         if (rc)
3195                 return ERR_PTR(-EINVAL);
3196
3197         /*
3198          * We're building the request with PAV disabled as we're reusing
3199          * the former startdev.
3200          */
3201         fcqr = dasd_eckd_build_format(base, startdev, &fdata, 0);
3202         if (IS_ERR(fcqr))
3203                 return fcqr;
3204
3205         fcqr->callback = dasd_eckd_ese_format_cb;
3206         fcqr->callback_data = (void *) format;
3207
3208         return fcqr;
3209 }
3210
3211 /*
3212  * When data is read from an unformatted area of an ESE volume, this function
3213  * returns zeroed data and thereby mimics a read of zero data.
3214  *
3215  * The first unformatted track is the one that got the NRF error, the address is
3216  * encoded in the sense data.
3217  *
3218  * All tracks before have returned valid data and should not be touched.
3219  * All tracks after the unformatted track might be formatted or not. This is
3220  * currently not known, remember the processed data and return the remainder of
3221  * the request to the blocklayer in __dasd_cleanup_cqr().
3222  */
3223 static int dasd_eckd_ese_read(struct dasd_ccw_req *cqr, struct irb *irb)
3224 {
3225         struct dasd_eckd_private *private;
3226         sector_t first_trk, last_trk;
3227         sector_t first_blk, last_blk;
3228         unsigned int blksize, off;
3229         unsigned int recs_per_trk;
3230         struct dasd_device *base;
3231         struct req_iterator iter;
3232         struct dasd_block *block;
3233         unsigned int skip_block;
3234         unsigned int blk_count;
3235         struct request *req;
3236         struct bio_vec bv;
3237         sector_t curr_trk;
3238         sector_t end_blk;
3239         char *dst;
3240         int rc;
3241
3242         req = (struct request *) cqr->callback_data;
3243         base = cqr->block->base;
3244         blksize = base->block->bp_block;
3245         block =  cqr->block;
3246         private = base->private;
3247         skip_block = 0;
3248         blk_count = 0;
3249
3250         recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3251         first_trk = first_blk = blk_rq_pos(req) >> block->s2b_shift;
3252         sector_div(first_trk, recs_per_trk);
3253         last_trk = last_blk =
3254                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3255         sector_div(last_trk, recs_per_trk);
3256         rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3257         if (rc)
3258                 return rc;
3259
3260         /* sanity check if the current track from sense data is valid */
3261         if (curr_trk < first_trk || curr_trk > last_trk) {
3262                 DBF_DEV_EVENT(DBF_WARNING, base,
3263                               "ESE error track %llu not within range %llu - %llu\n",
3264                               curr_trk, first_trk, last_trk);
3265                 return -EINVAL;
3266         }
3267
3268         /*
3269          * if not the first track got the NRF error we have to skip over valid
3270          * blocks
3271          */
3272         if (curr_trk != first_trk)
3273                 skip_block = curr_trk * recs_per_trk - first_blk;
3274
3275         /* we have no information beyond the current track */
3276         end_blk = (curr_trk + 1) * recs_per_trk;
3277
3278         rq_for_each_segment(bv, req, iter) {
3279                 dst = bvec_virt(&bv);
3280                 for (off = 0; off < bv.bv_len; off += blksize) {
3281                         if (first_blk + blk_count >= end_blk) {
3282                                 cqr->proc_bytes = blk_count * blksize;
3283                                 return 0;
3284                         }
3285                         if (dst && !skip_block)
3286                                 memset(dst, 0, blksize);
3287                         else
3288                                 skip_block--;
3289                         dst += blksize;
3290                         blk_count++;
3291                 }
3292         }
3293         return 0;
3294 }
3295
3296 /*
3297  * Helper function to count consecutive records of a single track.
3298  */
3299 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
3300                                    int max)
3301 {
3302         int head;
3303         int i;
3304
3305         head = fmt_buffer[start].head;
3306
3307         /*
3308          * There are 3 conditions where we stop counting:
3309          * - if data reoccurs (same head and record may reoccur), which may
3310          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
3311          * - when the head changes, because we're iterating over several tracks
3312          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
3313          * - when we've reached the end of sensible data in the buffer (the
3314          *   record will be 0 then)
3315          */
3316         for (i = start; i < max; i++) {
3317                 if (i > start) {
3318                         if ((fmt_buffer[i].head == head &&
3319                             fmt_buffer[i].record == 1) ||
3320                             fmt_buffer[i].head != head ||
3321                             fmt_buffer[i].record == 0)
3322                                 break;
3323                 }
3324         }
3325
3326         return i - start;
3327 }
3328
3329 /*
3330  * Evaluate a given range of tracks. Data like number of records, blocksize,
3331  * record ids, and key length are compared with expected data.
3332  *
3333  * If a mismatch occurs, the corresponding error bit is set, as well as
3334  * additional information, depending on the error.
3335  */
3336 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
3337                                              struct format_check_t *cdata,
3338                                              int rpt_max, int rpt_exp,
3339                                              int trk_per_cyl, int tpm)
3340 {
3341         struct ch_t geo;
3342         int max_entries;
3343         int count = 0;
3344         int trkcount;
3345         int blksize;
3346         int pos = 0;
3347         int i, j;
3348         int kl;
3349
3350         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3351         max_entries = trkcount * rpt_max;
3352
3353         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
3354                 /* Calculate the correct next starting position in the buffer */
3355                 if (tpm) {
3356                         while (fmt_buffer[pos].record == 0 &&
3357                                fmt_buffer[pos].dl == 0) {
3358                                 if (pos++ > max_entries)
3359                                         break;
3360                         }
3361                 } else {
3362                         if (i != cdata->expect.start_unit)
3363                                 pos += rpt_max - count;
3364                 }
3365
3366                 /* Calculate the expected geo values for the current track */
3367                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
3368
3369                 /* Count and check number of records */
3370                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
3371
3372                 if (count < rpt_exp) {
3373                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
3374                         break;
3375                 }
3376                 if (count > rpt_exp) {
3377                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
3378                         break;
3379                 }
3380
3381                 for (j = 0; j < count; j++, pos++) {
3382                         blksize = cdata->expect.blksize;
3383                         kl = 0;
3384
3385                         /*
3386                          * Set special values when checking CDL formatted
3387                          * devices.
3388                          */
3389                         if ((cdata->expect.intensity & 0x08) &&
3390                             geo.cyl == 0 && geo.head == 0) {
3391                                 if (j < 3) {
3392                                         blksize = sizes_trk0[j] - 4;
3393                                         kl = 4;
3394                                 }
3395                         }
3396                         if ((cdata->expect.intensity & 0x08) &&
3397                             geo.cyl == 0 && geo.head == 1) {
3398                                 blksize = LABEL_SIZE - 44;
3399                                 kl = 44;
3400                         }
3401
3402                         /* Check blocksize */
3403                         if (fmt_buffer[pos].dl != blksize) {
3404                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
3405                                 goto out;
3406                         }
3407                         /* Check if key length is 0 */
3408                         if (fmt_buffer[pos].kl != kl) {
3409                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
3410                                 goto out;
3411                         }
3412                         /* Check if record_id is correct */
3413                         if (fmt_buffer[pos].cyl != geo.cyl ||
3414                             fmt_buffer[pos].head != geo.head ||
3415                             fmt_buffer[pos].record != (j + 1)) {
3416                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
3417                                 goto out;
3418                         }
3419                 }
3420         }
3421
3422 out:
3423         /*
3424          * In case of no errors, we need to decrease by one
3425          * to get the correct positions.
3426          */
3427         if (!cdata->result) {
3428                 i--;
3429                 pos--;
3430         }
3431
3432         cdata->unit = i;
3433         cdata->num_records = count;
3434         cdata->rec = fmt_buffer[pos].record;
3435         cdata->blksize = fmt_buffer[pos].dl;
3436         cdata->key_length = fmt_buffer[pos].kl;
3437 }
3438
3439 /*
3440  * Check the format of a range of tracks of a DASD.
3441  */
3442 static int dasd_eckd_check_device_format(struct dasd_device *base,
3443                                          struct format_check_t *cdata,
3444                                          int enable_pav)
3445 {
3446         struct dasd_eckd_private *private = base->private;
3447         struct eckd_count *fmt_buffer;
3448         struct irb irb;
3449         int rpt_max, rpt_exp;
3450         int fmt_buffer_size;
3451         int trk_per_cyl;
3452         int trkcount;
3453         int tpm = 0;
3454         int rc;
3455
3456         trk_per_cyl = private->rdc_data.trk_per_cyl;
3457
3458         /* Get maximum and expected amount of records per track */
3459         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
3460         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
3461
3462         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3463         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
3464
3465         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
3466         if (!fmt_buffer)
3467                 return -ENOMEM;
3468
3469         /*
3470          * A certain FICON feature subset is needed to operate in transport
3471          * mode. Additionally, the support for transport mode is implicitly
3472          * checked by comparing the buffer size with fcx_max_data. As long as
3473          * the buffer size is smaller we can operate in transport mode and
3474          * process multiple tracks. If not, only one track at once is being
3475          * processed using command mode.
3476          */
3477         if ((private->features.feature[40] & 0x04) &&
3478             fmt_buffer_size <= private->fcx_max_data)
3479                 tpm = 1;
3480
3481         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
3482                                            tpm, fmt_buffer, rpt_max, &irb);
3483         if (rc && rc != -EIO)
3484                 goto out;
3485         if (rc == -EIO) {
3486                 /*
3487                  * If our first attempt with transport mode enabled comes back
3488                  * with an incorrect length error, we're going to retry the
3489                  * check with command mode.
3490                  */
3491                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
3492                         tpm = 0;
3493                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
3494                                                            enable_pav, tpm,
3495                                                            fmt_buffer, rpt_max,
3496                                                            &irb);
3497                         if (rc)
3498                                 goto out;
3499                 } else {
3500                         goto out;
3501                 }
3502         }
3503
3504         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
3505                                          trk_per_cyl, tpm);
3506
3507 out:
3508         kfree(fmt_buffer);
3509
3510         return rc;
3511 }
3512
3513 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
3514 {
3515         if (cqr->retries < 0) {
3516                 cqr->status = DASD_CQR_FAILED;
3517                 return;
3518         }
3519         cqr->status = DASD_CQR_FILLED;
3520         if (cqr->block && (cqr->startdev != cqr->block->base)) {
3521                 dasd_eckd_reset_ccw_to_base_io(cqr);
3522                 cqr->startdev = cqr->block->base;
3523                 cqr->lpm = dasd_path_get_opm(cqr->block->base);
3524         }
3525 };
3526
3527 static dasd_erp_fn_t
3528 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
3529 {
3530         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
3531         struct ccw_device *cdev = device->cdev;
3532
3533         switch (cdev->id.cu_type) {
3534         case 0x3990:
3535         case 0x2105:
3536         case 0x2107:
3537         case 0x1750:
3538                 return dasd_3990_erp_action;
3539         case 0x9343:
3540         case 0x3880:
3541         default:
3542                 return dasd_default_erp_action;
3543         }
3544 }
3545
3546 static dasd_erp_fn_t
3547 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3548 {
3549         return dasd_default_erp_postaction;
3550 }
3551
3552 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3553                                               struct dasd_ccw_req *cqr,
3554                                               struct irb *irb)
3555 {
3556         char mask;
3557         char *sense = NULL;
3558         struct dasd_eckd_private *private = device->private;
3559
3560         /* first of all check for state change pending interrupt */
3561         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3562         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3563                 /*
3564                  * for alias only, not in offline processing
3565                  * and only if not suspended
3566                  */
3567                 if (!device->block && private->lcu &&
3568                     device->state == DASD_STATE_ONLINE &&
3569                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3570                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3571                         /* schedule worker to reload device */
3572                         dasd_reload_device(device);
3573                 }
3574                 dasd_generic_handle_state_change(device);
3575                 return;
3576         }
3577
3578         sense = dasd_get_sense(irb);
3579         if (!sense)
3580                 return;
3581
3582         /* summary unit check */
3583         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3584             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3585                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3586                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3587                                       "eckd suc: device already notified");
3588                         return;
3589                 }
3590                 sense = dasd_get_sense(irb);
3591                 if (!sense) {
3592                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3593                                       "eckd suc: no reason code available");
3594                         clear_bit(DASD_FLAG_SUC, &device->flags);
3595                         return;
3596
3597                 }
3598                 private->suc_reason = sense[8];
3599                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3600                               "eckd handle summary unit check: reason",
3601                               private->suc_reason);
3602                 dasd_get_device(device);
3603                 if (!schedule_work(&device->suc_work))
3604                         dasd_put_device(device);
3605
3606                 return;
3607         }
3608
3609         /* service information message SIM */
3610         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3611             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3612                 dasd_3990_erp_handle_sim(device, sense);
3613                 return;
3614         }
3615
3616         /* loss of device reservation is handled via base devices only
3617          * as alias devices may be used with several bases
3618          */
3619         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3620             (sense[7] == 0x3F) &&
3621             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3622             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3623                 if (device->features & DASD_FEATURE_FAILONSLCK)
3624                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3625                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3626                 dev_err(&device->cdev->dev,
3627                         "The device reservation was lost\n");
3628         }
3629 }
3630
3631 static int dasd_eckd_ras_sanity_checks(struct dasd_device *device,
3632                                        unsigned int first_trk,
3633                                        unsigned int last_trk)
3634 {
3635         struct dasd_eckd_private *private = device->private;
3636         unsigned int trks_per_vol;
3637         int rc = 0;
3638
3639         trks_per_vol = private->real_cyl * private->rdc_data.trk_per_cyl;
3640
3641         if (first_trk >= trks_per_vol) {
3642                 dev_warn(&device->cdev->dev,
3643                          "Start track number %u used in the space release command is too big\n",
3644                          first_trk);
3645                 rc = -EINVAL;
3646         } else if (last_trk >= trks_per_vol) {
3647                 dev_warn(&device->cdev->dev,
3648                          "Stop track number %u used in the space release command is too big\n",
3649                          last_trk);
3650                 rc = -EINVAL;
3651         } else if (first_trk > last_trk) {
3652                 dev_warn(&device->cdev->dev,
3653                          "Start track %u used in the space release command exceeds the end track\n",
3654                          first_trk);
3655                 rc = -EINVAL;
3656         }
3657         return rc;
3658 }
3659
3660 /*
3661  * Helper function to count the amount of involved extents within a given range
3662  * with extent alignment in mind.
3663  */
3664 static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
3665 {
3666         int cur_pos = 0;
3667         int count = 0;
3668         int tmp;
3669
3670         if (from == to)
3671                 return 1;
3672
3673         /* Count first partial extent */
3674         if (from % trks_per_ext != 0) {
3675                 tmp = from + trks_per_ext - (from % trks_per_ext) - 1;
3676                 if (tmp > to)
3677                         tmp = to;
3678                 cur_pos = tmp - from + 1;
3679                 count++;
3680         }
3681         /* Count full extents */
3682         if (to - (from + cur_pos) + 1 >= trks_per_ext) {
3683                 tmp = to - ((to - trks_per_ext + 1) % trks_per_ext);
3684                 count += (tmp - (from + cur_pos) + 1) / trks_per_ext;
3685                 cur_pos = tmp;
3686         }
3687         /* Count last partial extent */
3688         if (cur_pos < to)
3689                 count++;
3690
3691         return count;
3692 }
3693
3694 /*
3695  * Release allocated space for a given range or an entire volume.
3696  */
3697 static struct dasd_ccw_req *
3698 dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
3699                   struct request *req, unsigned int first_trk,
3700                   unsigned int last_trk, int by_extent)
3701 {
3702         struct dasd_eckd_private *private = device->private;
3703         struct dasd_dso_ras_ext_range *ras_range;
3704         struct dasd_rssd_features *features;
3705         struct dasd_dso_ras_data *ras_data;
3706         u16 heads, beg_head, end_head;
3707         int cur_to_trk, cur_from_trk;
3708         struct dasd_ccw_req *cqr;
3709         u32 beg_cyl, end_cyl;
3710         struct ccw1 *ccw;
3711         int trks_per_ext;
3712         size_t ras_size;
3713         size_t size;
3714         int nr_exts;
3715         void *rq;
3716         int i;
3717
3718         if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
3719                 return ERR_PTR(-EINVAL);
3720
3721         rq = req ? blk_mq_rq_to_pdu(req) : NULL;
3722
3723         features = &private->features;
3724
3725         trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3726         nr_exts = 0;
3727         if (by_extent)
3728                 nr_exts = count_exts(first_trk, last_trk, trks_per_ext);
3729         ras_size = sizeof(*ras_data);
3730         size = ras_size + (nr_exts * sizeof(*ras_range));
3731
3732         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, size, device, rq);
3733         if (IS_ERR(cqr)) {
3734                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
3735                                 "Could not allocate RAS request");
3736                 return cqr;
3737         }
3738
3739         ras_data = cqr->data;
3740         memset(ras_data, 0, size);
3741
3742         ras_data->order = DSO_ORDER_RAS;
3743         ras_data->flags.vol_type = 0; /* CKD volume */
3744         /* Release specified extents or entire volume */
3745         ras_data->op_flags.by_extent = by_extent;
3746         /*
3747          * This bit guarantees initialisation of tracks within an extent that is
3748          * not fully specified, but is only supported with a certain feature
3749          * subset.
3750          */
3751         ras_data->op_flags.guarantee_init = !!(features->feature[56] & 0x01);
3752         ras_data->lss = private->conf.ned->ID;
3753         ras_data->dev_addr = private->conf.ned->unit_addr;
3754         ras_data->nr_exts = nr_exts;
3755
3756         if (by_extent) {
3757                 heads = private->rdc_data.trk_per_cyl;
3758                 cur_from_trk = first_trk;
3759                 cur_to_trk = first_trk + trks_per_ext -
3760                         (first_trk % trks_per_ext) - 1;
3761                 if (cur_to_trk > last_trk)
3762                         cur_to_trk = last_trk;
3763                 ras_range = (struct dasd_dso_ras_ext_range *)(cqr->data + ras_size);
3764
3765                 for (i = 0; i < nr_exts; i++) {
3766                         beg_cyl = cur_from_trk / heads;
3767                         beg_head = cur_from_trk % heads;
3768                         end_cyl = cur_to_trk / heads;
3769                         end_head = cur_to_trk % heads;
3770
3771                         set_ch_t(&ras_range->beg_ext, beg_cyl, beg_head);
3772                         set_ch_t(&ras_range->end_ext, end_cyl, end_head);
3773
3774                         cur_from_trk = cur_to_trk + 1;
3775                         cur_to_trk = cur_from_trk + trks_per_ext - 1;
3776                         if (cur_to_trk > last_trk)
3777                                 cur_to_trk = last_trk;
3778                         ras_range++;
3779                 }
3780         }
3781
3782         ccw = cqr->cpaddr;
3783         ccw->cda = (__u32)(addr_t)cqr->data;
3784         ccw->cmd_code = DASD_ECKD_CCW_DSO;
3785         ccw->count = size;
3786
3787         cqr->startdev = device;
3788         cqr->memdev = device;
3789         cqr->block = block;
3790         cqr->retries = 256;
3791         cqr->expires = device->default_expires * HZ;
3792         cqr->buildclk = get_tod_clock();
3793         cqr->status = DASD_CQR_FILLED;
3794
3795         return cqr;
3796 }
3797
3798 static int dasd_eckd_release_space_full(struct dasd_device *device)
3799 {
3800         struct dasd_ccw_req *cqr;
3801         int rc;
3802
3803         cqr = dasd_eckd_dso_ras(device, NULL, NULL, 0, 0, 0);
3804         if (IS_ERR(cqr))
3805                 return PTR_ERR(cqr);
3806
3807         rc = dasd_sleep_on_interruptible(cqr);
3808
3809         dasd_sfree_request(cqr, cqr->memdev);
3810
3811         return rc;
3812 }
3813
3814 static int dasd_eckd_release_space_trks(struct dasd_device *device,
3815                                         unsigned int from, unsigned int to)
3816 {
3817         struct dasd_eckd_private *private = device->private;
3818         struct dasd_block *block = device->block;
3819         struct dasd_ccw_req *cqr, *n;
3820         struct list_head ras_queue;
3821         unsigned int device_exts;
3822         int trks_per_ext;
3823         int stop, step;
3824         int cur_pos;
3825         int rc = 0;
3826         int retry;
3827
3828         INIT_LIST_HEAD(&ras_queue);
3829
3830         device_exts = private->real_cyl / dasd_eckd_ext_size(device);
3831         trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3832
3833         /* Make sure device limits are not exceeded */
3834         step = trks_per_ext * min(device_exts, DASD_ECKD_RAS_EXTS_MAX);
3835         cur_pos = from;
3836
3837         do {
3838                 retry = 0;
3839                 while (cur_pos < to) {
3840                         stop = cur_pos + step -
3841                                 ((cur_pos + step) % trks_per_ext) - 1;
3842                         if (stop > to)
3843                                 stop = to;
3844
3845                         cqr = dasd_eckd_dso_ras(device, NULL, NULL, cur_pos, stop, 1);
3846                         if (IS_ERR(cqr)) {
3847                                 rc = PTR_ERR(cqr);
3848                                 if (rc == -ENOMEM) {
3849                                         if (list_empty(&ras_queue))
3850                                                 goto out;
3851                                         retry = 1;
3852                                         break;
3853                                 }
3854                                 goto err_out;
3855                         }
3856
3857                         spin_lock_irq(&block->queue_lock);
3858                         list_add_tail(&cqr->blocklist, &ras_queue);
3859                         spin_unlock_irq(&block->queue_lock);
3860                         cur_pos = stop + 1;
3861                 }
3862
3863                 rc = dasd_sleep_on_queue_interruptible(&ras_queue);
3864
3865 err_out:
3866                 list_for_each_entry_safe(cqr, n, &ras_queue, blocklist) {
3867                         device = cqr->startdev;
3868                         private = device->private;
3869
3870                         spin_lock_irq(&block->queue_lock);
3871                         list_del_init(&cqr->blocklist);
3872                         spin_unlock_irq(&block->queue_lock);
3873                         dasd_sfree_request(cqr, device);
3874                         private->count--;
3875                 }
3876         } while (retry);
3877
3878 out:
3879         return rc;
3880 }
3881
3882 static int dasd_eckd_release_space(struct dasd_device *device,
3883                                    struct format_data_t *rdata)
3884 {
3885         if (rdata->intensity & DASD_FMT_INT_ESE_FULL)
3886                 return dasd_eckd_release_space_full(device);
3887         else if (rdata->intensity == 0)
3888                 return dasd_eckd_release_space_trks(device, rdata->start_unit,
3889                                                     rdata->stop_unit);
3890         else
3891                 return -EINVAL;
3892 }
3893
3894 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3895                                                struct dasd_device *startdev,
3896                                                struct dasd_block *block,
3897                                                struct request *req,
3898                                                sector_t first_rec,
3899                                                sector_t last_rec,
3900                                                sector_t first_trk,
3901                                                sector_t last_trk,
3902                                                unsigned int first_offs,
3903                                                unsigned int last_offs,
3904                                                unsigned int blk_per_trk,
3905                                                unsigned int blksize)
3906 {
3907         struct dasd_eckd_private *private;
3908         unsigned long *idaws;
3909         struct LO_eckd_data *LO_data;
3910         struct dasd_ccw_req *cqr;
3911         struct ccw1 *ccw;
3912         struct req_iterator iter;
3913         struct bio_vec bv;
3914         char *dst;
3915         unsigned int off;
3916         int count, cidaw, cplength, datasize;
3917         sector_t recid;
3918         unsigned char cmd, rcmd;
3919         int use_prefix;
3920         struct dasd_device *basedev;
3921
3922         basedev = block->base;
3923         private = basedev->private;
3924         if (rq_data_dir(req) == READ)
3925                 cmd = DASD_ECKD_CCW_READ_MT;
3926         else if (rq_data_dir(req) == WRITE)
3927                 cmd = DASD_ECKD_CCW_WRITE_MT;
3928         else
3929                 return ERR_PTR(-EINVAL);
3930
3931         /* Check struct bio and count the number of blocks for the request. */
3932         count = 0;
3933         cidaw = 0;
3934         rq_for_each_segment(bv, req, iter) {
3935                 if (bv.bv_len & (blksize - 1))
3936                         /* Eckd can only do full blocks. */
3937                         return ERR_PTR(-EINVAL);
3938                 count += bv.bv_len >> (block->s2b_shift + 9);
3939                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3940                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3941         }
3942         /* Paranoia. */
3943         if (count != last_rec - first_rec + 1)
3944                 return ERR_PTR(-EINVAL);
3945
3946         /* use the prefix command if available */
3947         use_prefix = private->features.feature[8] & 0x01;
3948         if (use_prefix) {
3949                 /* 1x prefix + number of blocks */
3950                 cplength = 2 + count;
3951                 /* 1x prefix + cidaws*sizeof(long) */
3952                 datasize = sizeof(struct PFX_eckd_data) +
3953                         sizeof(struct LO_eckd_data) +
3954                         cidaw * sizeof(unsigned long);
3955         } else {
3956                 /* 1x define extent + 1x locate record + number of blocks */
3957                 cplength = 2 + count;
3958                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3959                 datasize = sizeof(struct DE_eckd_data) +
3960                         sizeof(struct LO_eckd_data) +
3961                         cidaw * sizeof(unsigned long);
3962         }
3963         /* Find out the number of additional locate record ccws for cdl. */
3964         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3965                 if (last_rec >= 2*blk_per_trk)
3966                         count = 2*blk_per_trk - first_rec;
3967                 cplength += count;
3968                 datasize += count*sizeof(struct LO_eckd_data);
3969         }
3970         /* Allocate the ccw request. */
3971         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3972                                    startdev, blk_mq_rq_to_pdu(req));
3973         if (IS_ERR(cqr))
3974                 return cqr;
3975         ccw = cqr->cpaddr;
3976         /* First ccw is define extent or prefix. */
3977         if (use_prefix) {
3978                 if (prefix(ccw++, cqr->data, first_trk,
3979                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
3980                         /* Clock not in sync and XRC is enabled.
3981                          * Try again later.
3982                          */
3983                         dasd_sfree_request(cqr, startdev);
3984                         return ERR_PTR(-EAGAIN);
3985                 }
3986                 idaws = (unsigned long *) (cqr->data +
3987                                            sizeof(struct PFX_eckd_data));
3988         } else {
3989                 if (define_extent(ccw++, cqr->data, first_trk,
3990                                   last_trk, cmd, basedev, 0) == -EAGAIN) {
3991                         /* Clock not in sync and XRC is enabled.
3992                          * Try again later.
3993                          */
3994                         dasd_sfree_request(cqr, startdev);
3995                         return ERR_PTR(-EAGAIN);
3996                 }
3997                 idaws = (unsigned long *) (cqr->data +
3998                                            sizeof(struct DE_eckd_data));
3999         }
4000         /* Build locate_record+read/write/ccws. */
4001         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
4002         recid = first_rec;
4003         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
4004                 /* Only standard blocks so there is just one locate record. */
4005                 ccw[-1].flags |= CCW_FLAG_CC;
4006                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
4007                               last_rec - recid + 1, cmd, basedev, blksize);
4008         }
4009         rq_for_each_segment(bv, req, iter) {
4010                 dst = bvec_virt(&bv);
4011                 if (dasd_page_cache) {
4012                         char *copy = kmem_cache_alloc(dasd_page_cache,
4013                                                       GFP_DMA | __GFP_NOWARN);
4014                         if (copy && rq_data_dir(req) == WRITE)
4015                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
4016                         if (copy)
4017                                 dst = copy + bv.bv_offset;
4018                 }
4019                 for (off = 0; off < bv.bv_len; off += blksize) {
4020                         sector_t trkid = recid;
4021                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
4022                         rcmd = cmd;
4023                         count = blksize;
4024                         /* Locate record for cdl special block ? */
4025                         if (private->uses_cdl && recid < 2*blk_per_trk) {
4026                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
4027                                         rcmd |= 0x8;
4028                                         count = dasd_eckd_cdl_reclen(recid);
4029                                         if (count < blksize &&
4030                                             rq_data_dir(req) == READ)
4031                                                 memset(dst + count, 0xe5,
4032                                                        blksize - count);
4033                                 }
4034                                 ccw[-1].flags |= CCW_FLAG_CC;
4035                                 locate_record(ccw++, LO_data++,
4036                                               trkid, recoffs + 1,
4037                                               1, rcmd, basedev, count);
4038                         }
4039                         /* Locate record for standard blocks ? */
4040                         if (private->uses_cdl && recid == 2*blk_per_trk) {
4041                                 ccw[-1].flags |= CCW_FLAG_CC;
4042                                 locate_record(ccw++, LO_data++,
4043                                               trkid, recoffs + 1,
4044                                               last_rec - recid + 1,
4045                                               cmd, basedev, count);
4046                         }
4047                         /* Read/write ccw. */
4048                         ccw[-1].flags |= CCW_FLAG_CC;
4049                         ccw->cmd_code = rcmd;
4050                         ccw->count = count;
4051                         if (idal_is_needed(dst, blksize)) {
4052                                 ccw->cda = (__u32)(addr_t) idaws;
4053                                 ccw->flags = CCW_FLAG_IDA;
4054                                 idaws = idal_create_words(idaws, dst, blksize);
4055                         } else {
4056                                 ccw->cda = (__u32)(addr_t) dst;
4057                                 ccw->flags = 0;
4058                         }
4059                         ccw++;
4060                         dst += blksize;
4061                         recid++;
4062                 }
4063         }
4064         if (blk_noretry_request(req) ||
4065             block->base->features & DASD_FEATURE_FAILFAST)
4066                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4067         cqr->startdev = startdev;
4068         cqr->memdev = startdev;
4069         cqr->block = block;
4070         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4071         cqr->lpm = dasd_path_get_ppm(startdev);
4072         cqr->retries = startdev->default_retries;
4073         cqr->buildclk = get_tod_clock();
4074         cqr->status = DASD_CQR_FILLED;
4075
4076         /* Set flags to suppress output for expected errors */
4077         if (dasd_eckd_is_ese(basedev)) {
4078                 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4079                 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4080                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4081         }
4082
4083         return cqr;
4084 }
4085
4086 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
4087                                                struct dasd_device *startdev,
4088                                                struct dasd_block *block,
4089                                                struct request *req,
4090                                                sector_t first_rec,
4091                                                sector_t last_rec,
4092                                                sector_t first_trk,
4093                                                sector_t last_trk,
4094                                                unsigned int first_offs,
4095                                                unsigned int last_offs,
4096                                                unsigned int blk_per_trk,
4097                                                unsigned int blksize)
4098 {
4099         unsigned long *idaws;
4100         struct dasd_ccw_req *cqr;
4101         struct ccw1 *ccw;
4102         struct req_iterator iter;
4103         struct bio_vec bv;
4104         char *dst, *idaw_dst;
4105         unsigned int cidaw, cplength, datasize;
4106         unsigned int tlf;
4107         sector_t recid;
4108         unsigned char cmd;
4109         struct dasd_device *basedev;
4110         unsigned int trkcount, count, count_to_trk_end;
4111         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
4112         unsigned char new_track, end_idaw;
4113         sector_t trkid;
4114         unsigned int recoffs;
4115
4116         basedev = block->base;
4117         if (rq_data_dir(req) == READ)
4118                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4119         else if (rq_data_dir(req) == WRITE)
4120                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4121         else
4122                 return ERR_PTR(-EINVAL);
4123
4124         /* Track based I/O needs IDAWs for each page, and not just for
4125          * 64 bit addresses. We need additional idals for pages
4126          * that get filled from two tracks, so we use the number
4127          * of records as upper limit.
4128          */
4129         cidaw = last_rec - first_rec + 1;
4130         trkcount = last_trk - first_trk + 1;
4131
4132         /* 1x prefix + one read/write ccw per track */
4133         cplength = 1 + trkcount;
4134
4135         datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
4136
4137         /* Allocate the ccw request. */
4138         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4139                                    startdev, blk_mq_rq_to_pdu(req));
4140         if (IS_ERR(cqr))
4141                 return cqr;
4142         ccw = cqr->cpaddr;
4143         /* transfer length factor: how many bytes to read from the last track */
4144         if (first_trk == last_trk)
4145                 tlf = last_offs - first_offs + 1;
4146         else
4147                 tlf = last_offs + 1;
4148         tlf *= blksize;
4149
4150         if (prefix_LRE(ccw++, cqr->data, first_trk,
4151                        last_trk, cmd, basedev, startdev,
4152                        1 /* format */, first_offs + 1,
4153                        trkcount, blksize,
4154                        tlf) == -EAGAIN) {
4155                 /* Clock not in sync and XRC is enabled.
4156                  * Try again later.
4157                  */
4158                 dasd_sfree_request(cqr, startdev);
4159                 return ERR_PTR(-EAGAIN);
4160         }
4161
4162         /*
4163          * The translation of request into ccw programs must meet the
4164          * following conditions:
4165          * - all idaws but the first and the last must address full pages
4166          *   (or 2K blocks on 31-bit)
4167          * - the scope of a ccw and it's idal ends with the track boundaries
4168          */
4169         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
4170         recid = first_rec;
4171         new_track = 1;
4172         end_idaw = 0;
4173         len_to_track_end = 0;
4174         idaw_dst = NULL;
4175         idaw_len = 0;
4176         rq_for_each_segment(bv, req, iter) {
4177                 dst = bvec_virt(&bv);
4178                 seg_len = bv.bv_len;
4179                 while (seg_len) {
4180                         if (new_track) {
4181                                 trkid = recid;
4182                                 recoffs = sector_div(trkid, blk_per_trk);
4183                                 count_to_trk_end = blk_per_trk - recoffs;
4184                                 count = min((last_rec - recid + 1),
4185                                             (sector_t)count_to_trk_end);
4186                                 len_to_track_end = count * blksize;
4187                                 ccw[-1].flags |= CCW_FLAG_CC;
4188                                 ccw->cmd_code = cmd;
4189                                 ccw->count = len_to_track_end;
4190                                 ccw->cda = (__u32)(addr_t)idaws;
4191                                 ccw->flags = CCW_FLAG_IDA;
4192                                 ccw++;
4193                                 recid += count;
4194                                 new_track = 0;
4195                                 /* first idaw for a ccw may start anywhere */
4196                                 if (!idaw_dst)
4197                                         idaw_dst = dst;
4198                         }
4199                         /* If we start a new idaw, we must make sure that it
4200                          * starts on an IDA_BLOCK_SIZE boundary.
4201                          * If we continue an idaw, we must make sure that the
4202                          * current segment begins where the so far accumulated
4203                          * idaw ends
4204                          */
4205                         if (!idaw_dst) {
4206                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
4207                                         dasd_sfree_request(cqr, startdev);
4208                                         return ERR_PTR(-ERANGE);
4209                                 } else
4210                                         idaw_dst = dst;
4211                         }
4212                         if ((idaw_dst + idaw_len) != dst) {
4213                                 dasd_sfree_request(cqr, startdev);
4214                                 return ERR_PTR(-ERANGE);
4215                         }
4216                         part_len = min(seg_len, len_to_track_end);
4217                         seg_len -= part_len;
4218                         dst += part_len;
4219                         idaw_len += part_len;
4220                         len_to_track_end -= part_len;
4221                         /* collected memory area ends on an IDA_BLOCK border,
4222                          * -> create an idaw
4223                          * idal_create_words will handle cases where idaw_len
4224                          * is larger then IDA_BLOCK_SIZE
4225                          */
4226                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
4227                                 end_idaw = 1;
4228                         /* We also need to end the idaw at track end */
4229                         if (!len_to_track_end) {
4230                                 new_track = 1;
4231                                 end_idaw = 1;
4232                         }
4233                         if (end_idaw) {
4234                                 idaws = idal_create_words(idaws, idaw_dst,
4235                                                           idaw_len);
4236                                 idaw_dst = NULL;
4237                                 idaw_len = 0;
4238                                 end_idaw = 0;
4239                         }
4240                 }
4241         }
4242
4243         if (blk_noretry_request(req) ||
4244             block->base->features & DASD_FEATURE_FAILFAST)
4245                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4246         cqr->startdev = startdev;
4247         cqr->memdev = startdev;
4248         cqr->block = block;
4249         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4250         cqr->lpm = dasd_path_get_ppm(startdev);
4251         cqr->retries = startdev->default_retries;
4252         cqr->buildclk = get_tod_clock();
4253         cqr->status = DASD_CQR_FILLED;
4254
4255         /* Set flags to suppress output for expected errors */
4256         if (dasd_eckd_is_ese(basedev))
4257                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4258
4259         return cqr;
4260 }
4261
4262 static int prepare_itcw(struct itcw *itcw,
4263                         unsigned int trk, unsigned int totrk, int cmd,
4264                         struct dasd_device *basedev,
4265                         struct dasd_device *startdev,
4266                         unsigned int rec_on_trk, int count,
4267                         unsigned int blksize,
4268                         unsigned int total_data_size,
4269                         unsigned int tlf,
4270                         unsigned int blk_per_trk)
4271 {
4272         struct PFX_eckd_data pfxdata;
4273         struct dasd_eckd_private *basepriv, *startpriv;
4274         struct DE_eckd_data *dedata;
4275         struct LRE_eckd_data *lredata;
4276         struct dcw *dcw;
4277
4278         u32 begcyl, endcyl;
4279         u16 heads, beghead, endhead;
4280         u8 pfx_cmd;
4281
4282         int rc = 0;
4283         int sector = 0;
4284         int dn, d;
4285
4286
4287         /* setup prefix data */
4288         basepriv = basedev->private;
4289         startpriv = startdev->private;
4290         dedata = &pfxdata.define_extent;
4291         lredata = &pfxdata.locate_record;
4292
4293         memset(&pfxdata, 0, sizeof(pfxdata));
4294         pfxdata.format = 1; /* PFX with LRE */
4295         pfxdata.base_address = basepriv->conf.ned->unit_addr;
4296         pfxdata.base_lss = basepriv->conf.ned->ID;
4297         pfxdata.validity.define_extent = 1;
4298
4299         /* private uid is kept up to date, conf_data may be outdated */
4300         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
4301                 pfxdata.validity.verify_base = 1;
4302
4303         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
4304                 pfxdata.validity.verify_base = 1;
4305                 pfxdata.validity.hyper_pav = 1;
4306         }
4307
4308         switch (cmd) {
4309         case DASD_ECKD_CCW_READ_TRACK_DATA:
4310                 dedata->mask.perm = 0x1;
4311                 dedata->attributes.operation = basepriv->attrib.operation;
4312                 dedata->blk_size = blksize;
4313                 dedata->ga_extended |= 0x42;
4314                 lredata->operation.orientation = 0x0;
4315                 lredata->operation.operation = 0x0C;
4316                 lredata->auxiliary.check_bytes = 0x01;
4317                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4318                 break;
4319         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
4320                 dedata->mask.perm = 0x02;
4321                 dedata->attributes.operation = basepriv->attrib.operation;
4322                 dedata->blk_size = blksize;
4323                 rc = set_timestamp(NULL, dedata, basedev);
4324                 dedata->ga_extended |= 0x42;
4325                 lredata->operation.orientation = 0x0;
4326                 lredata->operation.operation = 0x3F;
4327                 lredata->extended_operation = 0x23;
4328                 lredata->auxiliary.check_bytes = 0x2;
4329                 /*
4330                  * If XRC is supported the System Time Stamp is set. The
4331                  * validity of the time stamp must be reflected in the prefix
4332                  * data as well.
4333                  */
4334                 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
4335                         pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
4336                 pfx_cmd = DASD_ECKD_CCW_PFX;
4337                 break;
4338         case DASD_ECKD_CCW_READ_COUNT_MT:
4339                 dedata->mask.perm = 0x1;
4340                 dedata->attributes.operation = DASD_BYPASS_CACHE;
4341                 dedata->ga_extended |= 0x42;
4342                 dedata->blk_size = blksize;
4343                 lredata->operation.orientation = 0x2;
4344                 lredata->operation.operation = 0x16;
4345                 lredata->auxiliary.check_bytes = 0x01;
4346                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4347                 break;
4348         default:
4349                 DBF_DEV_EVENT(DBF_ERR, basedev,
4350                               "prepare itcw, unknown opcode 0x%x", cmd);
4351                 BUG();
4352                 break;
4353         }
4354         if (rc)
4355                 return rc;
4356
4357         dedata->attributes.mode = 0x3;  /* ECKD */
4358
4359         heads = basepriv->rdc_data.trk_per_cyl;
4360         begcyl = trk / heads;
4361         beghead = trk % heads;
4362         endcyl = totrk / heads;
4363         endhead = totrk % heads;
4364
4365         /* check for sequential prestage - enhance cylinder range */
4366         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
4367             dedata->attributes.operation == DASD_SEQ_ACCESS) {
4368
4369                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
4370                         endcyl += basepriv->attrib.nr_cyl;
4371                 else
4372                         endcyl = (basepriv->real_cyl - 1);
4373         }
4374
4375         set_ch_t(&dedata->beg_ext, begcyl, beghead);
4376         set_ch_t(&dedata->end_ext, endcyl, endhead);
4377
4378         dedata->ep_format = 0x20; /* records per track is valid */
4379         dedata->ep_rec_per_track = blk_per_trk;
4380
4381         if (rec_on_trk) {
4382                 switch (basepriv->rdc_data.dev_type) {
4383                 case 0x3390:
4384                         dn = ceil_quot(blksize + 6, 232);
4385                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
4386                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
4387                         break;
4388                 case 0x3380:
4389                         d = 7 + ceil_quot(blksize + 12, 32);
4390                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
4391                         break;
4392                 }
4393         }
4394
4395         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
4396                 lredata->auxiliary.length_valid = 0;
4397                 lredata->auxiliary.length_scope = 0;
4398                 lredata->sector = 0xff;
4399         } else {
4400                 lredata->auxiliary.length_valid = 1;
4401                 lredata->auxiliary.length_scope = 1;
4402                 lredata->sector = sector;
4403         }
4404         lredata->auxiliary.imbedded_ccw_valid = 1;
4405         lredata->length = tlf;
4406         lredata->imbedded_ccw = cmd;
4407         lredata->count = count;
4408         set_ch_t(&lredata->seek_addr, begcyl, beghead);
4409         lredata->search_arg.cyl = lredata->seek_addr.cyl;
4410         lredata->search_arg.head = lredata->seek_addr.head;
4411         lredata->search_arg.record = rec_on_trk;
4412
4413         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
4414                      &pfxdata, sizeof(pfxdata), total_data_size);
4415         return PTR_ERR_OR_ZERO(dcw);
4416 }
4417
4418 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
4419                                                struct dasd_device *startdev,
4420                                                struct dasd_block *block,
4421                                                struct request *req,
4422                                                sector_t first_rec,
4423                                                sector_t last_rec,
4424                                                sector_t first_trk,
4425                                                sector_t last_trk,
4426                                                unsigned int first_offs,
4427                                                unsigned int last_offs,
4428                                                unsigned int blk_per_trk,
4429                                                unsigned int blksize)
4430 {
4431         struct dasd_ccw_req *cqr;
4432         struct req_iterator iter;
4433         struct bio_vec bv;
4434         char *dst;
4435         unsigned int trkcount, ctidaw;
4436         unsigned char cmd;
4437         struct dasd_device *basedev;
4438         unsigned int tlf;
4439         struct itcw *itcw;
4440         struct tidaw *last_tidaw = NULL;
4441         int itcw_op;
4442         size_t itcw_size;
4443         u8 tidaw_flags;
4444         unsigned int seg_len, part_len, len_to_track_end;
4445         unsigned char new_track;
4446         sector_t recid, trkid;
4447         unsigned int offs;
4448         unsigned int count, count_to_trk_end;
4449         int ret;
4450
4451         basedev = block->base;
4452         if (rq_data_dir(req) == READ) {
4453                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4454                 itcw_op = ITCW_OP_READ;
4455         } else if (rq_data_dir(req) == WRITE) {
4456                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4457                 itcw_op = ITCW_OP_WRITE;
4458         } else
4459                 return ERR_PTR(-EINVAL);
4460
4461         /* trackbased I/O needs address all memory via TIDAWs,
4462          * not just for 64 bit addresses. This allows us to map
4463          * each segment directly to one tidaw.
4464          * In the case of write requests, additional tidaws may
4465          * be needed when a segment crosses a track boundary.
4466          */
4467         trkcount = last_trk - first_trk + 1;
4468         ctidaw = 0;
4469         rq_for_each_segment(bv, req, iter) {
4470                 ++ctidaw;
4471         }
4472         if (rq_data_dir(req) == WRITE)
4473                 ctidaw += (last_trk - first_trk);
4474
4475         /* Allocate the ccw request. */
4476         itcw_size = itcw_calc_size(0, ctidaw, 0);
4477         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
4478                                    blk_mq_rq_to_pdu(req));
4479         if (IS_ERR(cqr))
4480                 return cqr;
4481
4482         /* transfer length factor: how many bytes to read from the last track */
4483         if (first_trk == last_trk)
4484                 tlf = last_offs - first_offs + 1;
4485         else
4486                 tlf = last_offs + 1;
4487         tlf *= blksize;
4488
4489         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
4490         if (IS_ERR(itcw)) {
4491                 ret = -EINVAL;
4492                 goto out_error;
4493         }
4494         cqr->cpaddr = itcw_get_tcw(itcw);
4495         if (prepare_itcw(itcw, first_trk, last_trk,
4496                          cmd, basedev, startdev,
4497                          first_offs + 1,
4498                          trkcount, blksize,
4499                          (last_rec - first_rec + 1) * blksize,
4500                          tlf, blk_per_trk) == -EAGAIN) {
4501                 /* Clock not in sync and XRC is enabled.
4502                  * Try again later.
4503                  */
4504                 ret = -EAGAIN;
4505                 goto out_error;
4506         }
4507         len_to_track_end = 0;
4508         /*
4509          * A tidaw can address 4k of memory, but must not cross page boundaries
4510          * We can let the block layer handle this by setting
4511          * blk_queue_segment_boundary to page boundaries and
4512          * blk_max_segment_size to page size when setting up the request queue.
4513          * For write requests, a TIDAW must not cross track boundaries, because
4514          * we have to set the CBC flag on the last tidaw for each track.
4515          */
4516         if (rq_data_dir(req) == WRITE) {
4517                 new_track = 1;
4518                 recid = first_rec;
4519                 rq_for_each_segment(bv, req, iter) {
4520                         dst = bvec_virt(&bv);
4521                         seg_len = bv.bv_len;
4522                         while (seg_len) {
4523                                 if (new_track) {
4524                                         trkid = recid;
4525                                         offs = sector_div(trkid, blk_per_trk);
4526                                         count_to_trk_end = blk_per_trk - offs;
4527                                         count = min((last_rec - recid + 1),
4528                                                     (sector_t)count_to_trk_end);
4529                                         len_to_track_end = count * blksize;
4530                                         recid += count;
4531                                         new_track = 0;
4532                                 }
4533                                 part_len = min(seg_len, len_to_track_end);
4534                                 seg_len -= part_len;
4535                                 len_to_track_end -= part_len;
4536                                 /* We need to end the tidaw at track end */
4537                                 if (!len_to_track_end) {
4538                                         new_track = 1;
4539                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
4540                                 } else
4541                                         tidaw_flags = 0;
4542                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
4543                                                             dst, part_len);
4544                                 if (IS_ERR(last_tidaw)) {
4545                                         ret = -EINVAL;
4546                                         goto out_error;
4547                                 }
4548                                 dst += part_len;
4549                         }
4550                 }
4551         } else {
4552                 rq_for_each_segment(bv, req, iter) {
4553                         dst = bvec_virt(&bv);
4554                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
4555                                                     dst, bv.bv_len);
4556                         if (IS_ERR(last_tidaw)) {
4557                                 ret = -EINVAL;
4558                                 goto out_error;
4559                         }
4560                 }
4561         }
4562         last_tidaw->flags |= TIDAW_FLAGS_LAST;
4563         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
4564         itcw_finalize(itcw);
4565
4566         if (blk_noretry_request(req) ||
4567             block->base->features & DASD_FEATURE_FAILFAST)
4568                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4569         cqr->cpmode = 1;
4570         cqr->startdev = startdev;
4571         cqr->memdev = startdev;
4572         cqr->block = block;
4573         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4574         cqr->lpm = dasd_path_get_ppm(startdev);
4575         cqr->retries = startdev->default_retries;
4576         cqr->buildclk = get_tod_clock();
4577         cqr->status = DASD_CQR_FILLED;
4578
4579         /* Set flags to suppress output for expected errors */
4580         if (dasd_eckd_is_ese(basedev)) {
4581                 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4582                 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4583                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4584         }
4585
4586         return cqr;
4587 out_error:
4588         dasd_sfree_request(cqr, startdev);
4589         return ERR_PTR(ret);
4590 }
4591
4592 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
4593                                                struct dasd_block *block,
4594                                                struct request *req)
4595 {
4596         int cmdrtd, cmdwtd;
4597         int use_prefix;
4598         int fcx_multitrack;
4599         struct dasd_eckd_private *private;
4600         struct dasd_device *basedev;
4601         sector_t first_rec, last_rec;
4602         sector_t first_trk, last_trk;
4603         unsigned int first_offs, last_offs;
4604         unsigned int blk_per_trk, blksize;
4605         int cdlspecial;
4606         unsigned int data_size;
4607         struct dasd_ccw_req *cqr;
4608
4609         basedev = block->base;
4610         private = basedev->private;
4611
4612         /* Calculate number of blocks/records per track. */
4613         blksize = block->bp_block;
4614         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4615         if (blk_per_trk == 0)
4616                 return ERR_PTR(-EINVAL);
4617         /* Calculate record id of first and last block. */
4618         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
4619         first_offs = sector_div(first_trk, blk_per_trk);
4620         last_rec = last_trk =
4621                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
4622         last_offs = sector_div(last_trk, blk_per_trk);
4623         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
4624
4625         fcx_multitrack = private->features.feature[40] & 0x20;
4626         data_size = blk_rq_bytes(req);
4627         if (data_size % blksize)
4628                 return ERR_PTR(-EINVAL);
4629         /* tpm write request add CBC data on each track boundary */
4630         if (rq_data_dir(req) == WRITE)
4631                 data_size += (last_trk - first_trk) * 4;
4632
4633         /* is read track data and write track data in command mode supported? */
4634         cmdrtd = private->features.feature[9] & 0x20;
4635         cmdwtd = private->features.feature[12] & 0x40;
4636         use_prefix = private->features.feature[8] & 0x01;
4637
4638         cqr = NULL;
4639         if (cdlspecial || dasd_page_cache) {
4640                 /* do nothing, just fall through to the cmd mode single case */
4641         } else if ((data_size <= private->fcx_max_data)
4642                    && (fcx_multitrack || (first_trk == last_trk))) {
4643                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
4644                                                     first_rec, last_rec,
4645                                                     first_trk, last_trk,
4646                                                     first_offs, last_offs,
4647                                                     blk_per_trk, blksize);
4648                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4649                     (PTR_ERR(cqr) != -ENOMEM))
4650                         cqr = NULL;
4651         } else if (use_prefix &&
4652                    (((rq_data_dir(req) == READ) && cmdrtd) ||
4653                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
4654                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
4655                                                    first_rec, last_rec,
4656                                                    first_trk, last_trk,
4657                                                    first_offs, last_offs,
4658                                                    blk_per_trk, blksize);
4659                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4660                     (PTR_ERR(cqr) != -ENOMEM))
4661                         cqr = NULL;
4662         }
4663         if (!cqr)
4664                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
4665                                                     first_rec, last_rec,
4666                                                     first_trk, last_trk,
4667                                                     first_offs, last_offs,
4668                                                     blk_per_trk, blksize);
4669         return cqr;
4670 }
4671
4672 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
4673                                                    struct dasd_block *block,
4674                                                    struct request *req)
4675 {
4676         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
4677         unsigned int seg_len, len_to_track_end;
4678         unsigned int cidaw, cplength, datasize;
4679         sector_t first_trk, last_trk, sectors;
4680         struct dasd_eckd_private *base_priv;
4681         struct dasd_device *basedev;
4682         struct req_iterator iter;
4683         struct dasd_ccw_req *cqr;
4684         unsigned int first_offs;
4685         unsigned int trkcount;
4686         unsigned long *idaws;
4687         unsigned int size;
4688         unsigned char cmd;
4689         struct bio_vec bv;
4690         struct ccw1 *ccw;
4691         int use_prefix;
4692         void *data;
4693         char *dst;
4694
4695         /*
4696          * raw track access needs to be mutiple of 64k and on 64k boundary
4697          * For read requests we can fix an incorrect alignment by padding
4698          * the request with dummy pages.
4699          */
4700         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
4701         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
4702                 DASD_RAW_SECTORS_PER_TRACK;
4703         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
4704                 DASD_RAW_SECTORS_PER_TRACK;
4705         basedev = block->base;
4706         if ((start_padding_sectors || end_padding_sectors) &&
4707             (rq_data_dir(req) == WRITE)) {
4708                 DBF_DEV_EVENT(DBF_ERR, basedev,
4709                               "raw write not track aligned (%llu,%llu) req %p",
4710                               start_padding_sectors, end_padding_sectors, req);
4711                 return ERR_PTR(-EINVAL);
4712         }
4713
4714         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
4715         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
4716                 DASD_RAW_SECTORS_PER_TRACK;
4717         trkcount = last_trk - first_trk + 1;
4718         first_offs = 0;
4719
4720         if (rq_data_dir(req) == READ)
4721                 cmd = DASD_ECKD_CCW_READ_TRACK;
4722         else if (rq_data_dir(req) == WRITE)
4723                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
4724         else
4725                 return ERR_PTR(-EINVAL);
4726
4727         /*
4728          * Raw track based I/O needs IDAWs for each page,
4729          * and not just for 64 bit addresses.
4730          */
4731         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
4732
4733         /*
4734          * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
4735          * of extended parameter. This is needed for write full track.
4736          */
4737         base_priv = basedev->private;
4738         use_prefix = base_priv->features.feature[8] & 0x01;
4739         if (use_prefix) {
4740                 cplength = 1 + trkcount;
4741                 size = sizeof(struct PFX_eckd_data) + 2;
4742         } else {
4743                 cplength = 2 + trkcount;
4744                 size = sizeof(struct DE_eckd_data) +
4745                         sizeof(struct LRE_eckd_data) + 2;
4746         }
4747         size = ALIGN(size, 8);
4748
4749         datasize = size + cidaw * sizeof(unsigned long);
4750
4751         /* Allocate the ccw request. */
4752         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
4753                                    datasize, startdev, blk_mq_rq_to_pdu(req));
4754         if (IS_ERR(cqr))
4755                 return cqr;
4756
4757         ccw = cqr->cpaddr;
4758         data = cqr->data;
4759
4760         if (use_prefix) {
4761                 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
4762                            startdev, 1, first_offs + 1, trkcount, 0, 0);
4763         } else {
4764                 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
4765                 ccw[-1].flags |= CCW_FLAG_CC;
4766
4767                 data += sizeof(struct DE_eckd_data);
4768                 locate_record_ext(ccw++, data, first_trk, first_offs + 1,
4769                                   trkcount, cmd, basedev, 0, 0);
4770         }
4771
4772         idaws = (unsigned long *)(cqr->data + size);
4773         len_to_track_end = 0;
4774         if (start_padding_sectors) {
4775                 ccw[-1].flags |= CCW_FLAG_CC;
4776                 ccw->cmd_code = cmd;
4777                 /* maximum 3390 track size */
4778                 ccw->count = 57326;
4779                 /* 64k map to one track */
4780                 len_to_track_end = 65536 - start_padding_sectors * 512;
4781                 ccw->cda = (__u32)(addr_t)idaws;
4782                 ccw->flags |= CCW_FLAG_IDA;
4783                 ccw->flags |= CCW_FLAG_SLI;
4784                 ccw++;
4785                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
4786                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4787         }
4788         rq_for_each_segment(bv, req, iter) {
4789                 dst = bvec_virt(&bv);
4790                 seg_len = bv.bv_len;
4791                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
4792                         memset(dst, 0, seg_len);
4793                 if (!len_to_track_end) {
4794                         ccw[-1].flags |= CCW_FLAG_CC;
4795                         ccw->cmd_code = cmd;
4796                         /* maximum 3390 track size */
4797                         ccw->count = 57326;
4798                         /* 64k map to one track */
4799                         len_to_track_end = 65536;
4800                         ccw->cda = (__u32)(addr_t)idaws;
4801                         ccw->flags |= CCW_FLAG_IDA;
4802                         ccw->flags |= CCW_FLAG_SLI;
4803                         ccw++;
4804                 }
4805                 len_to_track_end -= seg_len;
4806                 idaws = idal_create_words(idaws, dst, seg_len);
4807         }
4808         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
4809                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4810         if (blk_noretry_request(req) ||
4811             block->base->features & DASD_FEATURE_FAILFAST)
4812                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4813         cqr->startdev = startdev;
4814         cqr->memdev = startdev;
4815         cqr->block = block;
4816         cqr->expires = startdev->default_expires * HZ;
4817         cqr->lpm = dasd_path_get_ppm(startdev);
4818         cqr->retries = startdev->default_retries;
4819         cqr->buildclk = get_tod_clock();
4820         cqr->status = DASD_CQR_FILLED;
4821
4822         return cqr;
4823 }
4824
4825
4826 static int
4827 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
4828 {
4829         struct dasd_eckd_private *private;
4830         struct ccw1 *ccw;
4831         struct req_iterator iter;
4832         struct bio_vec bv;
4833         char *dst, *cda;
4834         unsigned int blksize, blk_per_trk, off;
4835         sector_t recid;
4836         int status;
4837
4838         if (!dasd_page_cache)
4839                 goto out;
4840         private = cqr->block->base->private;
4841         blksize = cqr->block->bp_block;
4842         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4843         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4844         ccw = cqr->cpaddr;
4845         /* Skip over define extent & locate record. */
4846         ccw++;
4847         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4848                 ccw++;
4849         rq_for_each_segment(bv, req, iter) {
4850                 dst = bvec_virt(&bv);
4851                 for (off = 0; off < bv.bv_len; off += blksize) {
4852                         /* Skip locate record. */
4853                         if (private->uses_cdl && recid <= 2*blk_per_trk)
4854                                 ccw++;
4855                         if (dst) {
4856                                 if (ccw->flags & CCW_FLAG_IDA)
4857                                         cda = *((char **)((addr_t) ccw->cda));
4858                                 else
4859                                         cda = (char *)((addr_t) ccw->cda);
4860                                 if (dst != cda) {
4861                                         if (rq_data_dir(req) == READ)
4862                                                 memcpy(dst, cda, bv.bv_len);
4863                                         kmem_cache_free(dasd_page_cache,
4864                                             (void *)((addr_t)cda & PAGE_MASK));
4865                                 }
4866                                 dst = NULL;
4867                         }
4868                         ccw++;
4869                         recid++;
4870                 }
4871         }
4872 out:
4873         status = cqr->status == DASD_CQR_DONE;
4874         dasd_sfree_request(cqr, cqr->memdev);
4875         return status;
4876 }
4877
4878 /*
4879  * Modify ccw/tcw in cqr so it can be started on a base device.
4880  *
4881  * Note that this is not enough to restart the cqr!
4882  * Either reset cqr->startdev as well (summary unit check handling)
4883  * or restart via separate cqr (as in ERP handling).
4884  */
4885 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4886 {
4887         struct ccw1 *ccw;
4888         struct PFX_eckd_data *pfxdata;
4889         struct tcw *tcw;
4890         struct tccb *tccb;
4891         struct dcw *dcw;
4892
4893         if (cqr->cpmode == 1) {
4894                 tcw = cqr->cpaddr;
4895                 tccb = tcw_get_tccb(tcw);
4896                 dcw = (struct dcw *)&tccb->tca[0];
4897                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4898                 pfxdata->validity.verify_base = 0;
4899                 pfxdata->validity.hyper_pav = 0;
4900         } else {
4901                 ccw = cqr->cpaddr;
4902                 pfxdata = cqr->data;
4903                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4904                         pfxdata->validity.verify_base = 0;
4905                         pfxdata->validity.hyper_pav = 0;
4906                 }
4907         }
4908 }
4909
4910 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4911
4912 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4913                                                      struct dasd_block *block,
4914                                                      struct request *req)
4915 {
4916         struct dasd_eckd_private *private;
4917         struct dasd_device *startdev;
4918         unsigned long flags;
4919         struct dasd_ccw_req *cqr;
4920
4921         startdev = dasd_alias_get_start_dev(base);
4922         if (!startdev)
4923                 startdev = base;
4924         private = startdev->private;
4925         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4926                 return ERR_PTR(-EBUSY);
4927
4928         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4929         private->count++;
4930         if ((base->features & DASD_FEATURE_USERAW))
4931                 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4932         else
4933                 cqr = dasd_eckd_build_cp(startdev, block, req);
4934         if (IS_ERR(cqr))
4935                 private->count--;
4936         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4937         return cqr;
4938 }
4939
4940 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4941                                    struct request *req)
4942 {
4943         struct dasd_eckd_private *private;
4944         unsigned long flags;
4945
4946         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4947         private = cqr->memdev->private;
4948         private->count--;
4949         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4950         return dasd_eckd_free_cp(cqr, req);
4951 }
4952
4953 static int
4954 dasd_eckd_fill_info(struct dasd_device * device,
4955                     struct dasd_information2_t * info)
4956 {
4957         struct dasd_eckd_private *private = device->private;
4958
4959         info->label_block = 2;
4960         info->FBA_layout = private->uses_cdl ? 0 : 1;
4961         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4962         info->characteristics_size = sizeof(private->rdc_data);
4963         memcpy(info->characteristics, &private->rdc_data,
4964                sizeof(private->rdc_data));
4965         info->confdata_size = min_t(unsigned long, private->conf.len,
4966                                     sizeof(info->configuration_data));
4967         memcpy(info->configuration_data, private->conf.data,
4968                info->confdata_size);
4969         return 0;
4970 }
4971
4972 /*
4973  * SECTION: ioctl functions for eckd devices.
4974  */
4975
4976 /*
4977  * Release device ioctl.
4978  * Buils a channel programm to releases a prior reserved
4979  * (see dasd_eckd_reserve) device.
4980  */
4981 static int
4982 dasd_eckd_release(struct dasd_device *device)
4983 {
4984         struct dasd_ccw_req *cqr;
4985         int rc;
4986         struct ccw1 *ccw;
4987         int useglobal;
4988
4989         if (!capable(CAP_SYS_ADMIN))
4990                 return -EACCES;
4991
4992         useglobal = 0;
4993         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4994         if (IS_ERR(cqr)) {
4995                 mutex_lock(&dasd_reserve_mutex);
4996                 useglobal = 1;
4997                 cqr = &dasd_reserve_req->cqr;
4998                 memset(cqr, 0, sizeof(*cqr));
4999                 memset(&dasd_reserve_req->ccw, 0,
5000                        sizeof(dasd_reserve_req->ccw));
5001                 cqr->cpaddr = &dasd_reserve_req->ccw;
5002                 cqr->data = &dasd_reserve_req->data;
5003                 cqr->magic = DASD_ECKD_MAGIC;
5004         }
5005         ccw = cqr->cpaddr;
5006         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
5007         ccw->flags |= CCW_FLAG_SLI;
5008         ccw->count = 32;
5009         ccw->cda = (__u32)(addr_t) cqr->data;
5010         cqr->startdev = device;
5011         cqr->memdev = device;
5012         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5013         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5014         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5015         cqr->expires = 2 * HZ;
5016         cqr->buildclk = get_tod_clock();
5017         cqr->status = DASD_CQR_FILLED;
5018
5019         rc = dasd_sleep_on_immediatly(cqr);
5020         if (!rc)
5021                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5022
5023         if (useglobal)
5024                 mutex_unlock(&dasd_reserve_mutex);
5025         else
5026                 dasd_sfree_request(cqr, cqr->memdev);
5027         return rc;
5028 }
5029
5030 /*
5031  * Reserve device ioctl.
5032  * Options are set to 'synchronous wait for interrupt' and
5033  * 'timeout the request'. This leads to a terminate IO if
5034  * the interrupt is outstanding for a certain time.
5035  */
5036 static int
5037 dasd_eckd_reserve(struct dasd_device *device)
5038 {
5039         struct dasd_ccw_req *cqr;
5040         int rc;
5041         struct ccw1 *ccw;
5042         int useglobal;
5043
5044         if (!capable(CAP_SYS_ADMIN))
5045                 return -EACCES;
5046
5047         useglobal = 0;
5048         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5049         if (IS_ERR(cqr)) {
5050                 mutex_lock(&dasd_reserve_mutex);
5051                 useglobal = 1;
5052                 cqr = &dasd_reserve_req->cqr;
5053                 memset(cqr, 0, sizeof(*cqr));
5054                 memset(&dasd_reserve_req->ccw, 0,
5055                        sizeof(dasd_reserve_req->ccw));
5056                 cqr->cpaddr = &dasd_reserve_req->ccw;
5057                 cqr->data = &dasd_reserve_req->data;
5058                 cqr->magic = DASD_ECKD_MAGIC;
5059         }
5060         ccw = cqr->cpaddr;
5061         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
5062         ccw->flags |= CCW_FLAG_SLI;
5063         ccw->count = 32;
5064         ccw->cda = (__u32)(addr_t) cqr->data;
5065         cqr->startdev = device;
5066         cqr->memdev = device;
5067         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5068         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5069         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5070         cqr->expires = 2 * HZ;
5071         cqr->buildclk = get_tod_clock();
5072         cqr->status = DASD_CQR_FILLED;
5073
5074         rc = dasd_sleep_on_immediatly(cqr);
5075         if (!rc)
5076                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5077
5078         if (useglobal)
5079                 mutex_unlock(&dasd_reserve_mutex);
5080         else
5081                 dasd_sfree_request(cqr, cqr->memdev);
5082         return rc;
5083 }
5084
5085 /*
5086  * Steal lock ioctl - unconditional reserve device.
5087  * Buils a channel programm to break a device's reservation.
5088  * (unconditional reserve)
5089  */
5090 static int
5091 dasd_eckd_steal_lock(struct dasd_device *device)
5092 {
5093         struct dasd_ccw_req *cqr;
5094         int rc;
5095         struct ccw1 *ccw;
5096         int useglobal;
5097
5098         if (!capable(CAP_SYS_ADMIN))
5099                 return -EACCES;
5100
5101         useglobal = 0;
5102         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5103         if (IS_ERR(cqr)) {
5104                 mutex_lock(&dasd_reserve_mutex);
5105                 useglobal = 1;
5106                 cqr = &dasd_reserve_req->cqr;
5107                 memset(cqr, 0, sizeof(*cqr));
5108                 memset(&dasd_reserve_req->ccw, 0,
5109                        sizeof(dasd_reserve_req->ccw));
5110                 cqr->cpaddr = &dasd_reserve_req->ccw;
5111                 cqr->data = &dasd_reserve_req->data;
5112                 cqr->magic = DASD_ECKD_MAGIC;
5113         }
5114         ccw = cqr->cpaddr;
5115         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
5116         ccw->flags |= CCW_FLAG_SLI;
5117         ccw->count = 32;
5118         ccw->cda = (__u32)(addr_t) cqr->data;
5119         cqr->startdev = device;
5120         cqr->memdev = device;
5121         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5122         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5123         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5124         cqr->expires = 2 * HZ;
5125         cqr->buildclk = get_tod_clock();
5126         cqr->status = DASD_CQR_FILLED;
5127
5128         rc = dasd_sleep_on_immediatly(cqr);
5129         if (!rc)
5130                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5131
5132         if (useglobal)
5133                 mutex_unlock(&dasd_reserve_mutex);
5134         else
5135                 dasd_sfree_request(cqr, cqr->memdev);
5136         return rc;
5137 }
5138
5139 /*
5140  * SNID - Sense Path Group ID
5141  * This ioctl may be used in situations where I/O is stalled due to
5142  * a reserve, so if the normal dasd_smalloc_request fails, we use the
5143  * preallocated dasd_reserve_req.
5144  */
5145 static int dasd_eckd_snid(struct dasd_device *device,
5146                           void __user *argp)
5147 {
5148         struct dasd_ccw_req *cqr;
5149         int rc;
5150         struct ccw1 *ccw;
5151         int useglobal;
5152         struct dasd_snid_ioctl_data usrparm;
5153
5154         if (!capable(CAP_SYS_ADMIN))
5155                 return -EACCES;
5156
5157         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5158                 return -EFAULT;
5159
5160         useglobal = 0;
5161         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
5162                                    sizeof(struct dasd_snid_data), device,
5163                                    NULL);
5164         if (IS_ERR(cqr)) {
5165                 mutex_lock(&dasd_reserve_mutex);
5166                 useglobal = 1;
5167                 cqr = &dasd_reserve_req->cqr;
5168                 memset(cqr, 0, sizeof(*cqr));
5169                 memset(&dasd_reserve_req->ccw, 0,
5170                        sizeof(dasd_reserve_req->ccw));
5171                 cqr->cpaddr = &dasd_reserve_req->ccw;
5172                 cqr->data = &dasd_reserve_req->data;
5173                 cqr->magic = DASD_ECKD_MAGIC;
5174         }
5175         ccw = cqr->cpaddr;
5176         ccw->cmd_code = DASD_ECKD_CCW_SNID;
5177         ccw->flags |= CCW_FLAG_SLI;
5178         ccw->count = 12;
5179         ccw->cda = (__u32)(addr_t) cqr->data;
5180         cqr->startdev = device;
5181         cqr->memdev = device;
5182         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5183         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5184         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
5185         cqr->retries = 5;
5186         cqr->expires = 10 * HZ;
5187         cqr->buildclk = get_tod_clock();
5188         cqr->status = DASD_CQR_FILLED;
5189         cqr->lpm = usrparm.path_mask;
5190
5191         rc = dasd_sleep_on_immediatly(cqr);
5192         /* verify that I/O processing didn't modify the path mask */
5193         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
5194                 rc = -EIO;
5195         if (!rc) {
5196                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
5197                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
5198                         rc = -EFAULT;
5199         }
5200
5201         if (useglobal)
5202                 mutex_unlock(&dasd_reserve_mutex);
5203         else
5204                 dasd_sfree_request(cqr, cqr->memdev);
5205         return rc;
5206 }
5207
5208 /*
5209  * Read performance statistics
5210  */
5211 static int
5212 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
5213 {
5214         struct dasd_psf_prssd_data *prssdp;
5215         struct dasd_rssd_perf_stats_t *stats;
5216         struct dasd_ccw_req *cqr;
5217         struct ccw1 *ccw;
5218         int rc;
5219
5220         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
5221                                    (sizeof(struct dasd_psf_prssd_data) +
5222                                     sizeof(struct dasd_rssd_perf_stats_t)),
5223                                    device, NULL);
5224         if (IS_ERR(cqr)) {
5225                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5226                             "Could not allocate initialization request");
5227                 return PTR_ERR(cqr);
5228         }
5229         cqr->startdev = device;
5230         cqr->memdev = device;
5231         cqr->retries = 0;
5232         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5233         cqr->expires = 10 * HZ;
5234
5235         /* Prepare for Read Subsystem Data */
5236         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5237         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5238         prssdp->order = PSF_ORDER_PRSSD;
5239         prssdp->suborder = 0x01;        /* Performance Statistics */
5240         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
5241
5242         ccw = cqr->cpaddr;
5243         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5244         ccw->count = sizeof(struct dasd_psf_prssd_data);
5245         ccw->flags |= CCW_FLAG_CC;
5246         ccw->cda = (__u32)(addr_t) prssdp;
5247
5248         /* Read Subsystem Data - Performance Statistics */
5249         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5250         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
5251
5252         ccw++;
5253         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5254         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
5255         ccw->cda = (__u32)(addr_t) stats;
5256
5257         cqr->buildclk = get_tod_clock();
5258         cqr->status = DASD_CQR_FILLED;
5259         rc = dasd_sleep_on(cqr);
5260         if (rc == 0) {
5261                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5262                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5263                 if (copy_to_user(argp, stats,
5264                                  sizeof(struct dasd_rssd_perf_stats_t)))
5265                         rc = -EFAULT;
5266         }
5267         dasd_sfree_request(cqr, cqr->memdev);
5268         return rc;
5269 }
5270
5271 /*
5272  * Get attributes (cache operations)
5273  * Returnes the cache attributes used in Define Extend (DE).
5274  */
5275 static int
5276 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
5277 {
5278         struct dasd_eckd_private *private = device->private;
5279         struct attrib_data_t attrib = private->attrib;
5280         int rc;
5281
5282         if (!capable(CAP_SYS_ADMIN))
5283                 return -EACCES;
5284         if (!argp)
5285                 return -EINVAL;
5286
5287         rc = 0;
5288         if (copy_to_user(argp, (long *) &attrib,
5289                          sizeof(struct attrib_data_t)))
5290                 rc = -EFAULT;
5291
5292         return rc;
5293 }
5294
5295 /*
5296  * Set attributes (cache operations)
5297  * Stores the attributes for cache operation to be used in Define Extend (DE).
5298  */
5299 static int
5300 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
5301 {
5302         struct dasd_eckd_private *private = device->private;
5303         struct attrib_data_t attrib;
5304
5305         if (!capable(CAP_SYS_ADMIN))
5306                 return -EACCES;
5307         if (!argp)
5308                 return -EINVAL;
5309
5310         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
5311                 return -EFAULT;
5312         private->attrib = attrib;
5313
5314         dev_info(&device->cdev->dev,
5315                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
5316                  private->attrib.operation, private->attrib.nr_cyl);
5317         return 0;
5318 }
5319
5320 /*
5321  * Issue syscall I/O to EMC Symmetrix array.
5322  * CCWs are PSF and RSSD
5323  */
5324 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
5325 {
5326         struct dasd_symmio_parms usrparm;
5327         char *psf_data, *rssd_result;
5328         struct dasd_ccw_req *cqr;
5329         struct ccw1 *ccw;
5330         char psf0, psf1;
5331         int rc;
5332
5333         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
5334                 return -EACCES;
5335         psf0 = psf1 = 0;
5336
5337         /* Copy parms from caller */
5338         rc = -EFAULT;
5339         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5340                 goto out;
5341         if (is_compat_task()) {
5342                 /* Make sure pointers are sane even on 31 bit. */
5343                 rc = -EINVAL;
5344                 if ((usrparm.psf_data >> 32) != 0)
5345                         goto out;
5346                 if ((usrparm.rssd_result >> 32) != 0)
5347                         goto out;
5348                 usrparm.psf_data &= 0x7fffffffULL;
5349                 usrparm.rssd_result &= 0x7fffffffULL;
5350         }
5351         /* at least 2 bytes are accessed and should be allocated */
5352         if (usrparm.psf_data_len < 2) {
5353                 DBF_DEV_EVENT(DBF_WARNING, device,
5354                               "Symmetrix ioctl invalid data length %d",
5355                               usrparm.psf_data_len);
5356                 rc = -EINVAL;
5357                 goto out;
5358         }
5359         /* alloc I/O data area */
5360         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
5361         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
5362         if (!psf_data || !rssd_result) {
5363                 rc = -ENOMEM;
5364                 goto out_free;
5365         }
5366
5367         /* get syscall header from user space */
5368         rc = -EFAULT;
5369         if (copy_from_user(psf_data,
5370                            (void __user *)(unsigned long) usrparm.psf_data,
5371                            usrparm.psf_data_len))
5372                 goto out_free;
5373         psf0 = psf_data[0];
5374         psf1 = psf_data[1];
5375
5376         /* setup CCWs for PSF + RSSD */
5377         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
5378         if (IS_ERR(cqr)) {
5379                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5380                         "Could not allocate initialization request");
5381                 rc = PTR_ERR(cqr);
5382                 goto out_free;
5383         }
5384
5385         cqr->startdev = device;
5386         cqr->memdev = device;
5387         cqr->retries = 3;
5388         cqr->expires = 10 * HZ;
5389         cqr->buildclk = get_tod_clock();
5390         cqr->status = DASD_CQR_FILLED;
5391
5392         /* Build the ccws */
5393         ccw = cqr->cpaddr;
5394
5395         /* PSF ccw */
5396         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5397         ccw->count = usrparm.psf_data_len;
5398         ccw->flags |= CCW_FLAG_CC;
5399         ccw->cda = (__u32)(addr_t) psf_data;
5400
5401         ccw++;
5402
5403         /* RSSD ccw  */
5404         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5405         ccw->count = usrparm.rssd_result_len;
5406         ccw->flags = CCW_FLAG_SLI ;
5407         ccw->cda = (__u32)(addr_t) rssd_result;
5408
5409         rc = dasd_sleep_on(cqr);
5410         if (rc)
5411                 goto out_sfree;
5412
5413         rc = -EFAULT;
5414         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
5415                            rssd_result, usrparm.rssd_result_len))
5416                 goto out_sfree;
5417         rc = 0;
5418
5419 out_sfree:
5420         dasd_sfree_request(cqr, cqr->memdev);
5421 out_free:
5422         kfree(rssd_result);
5423         kfree(psf_data);
5424 out:
5425         DBF_DEV_EVENT(DBF_WARNING, device,
5426                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
5427                       (int) psf0, (int) psf1, rc);
5428         return rc;
5429 }
5430
5431 static int
5432 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
5433 {
5434         struct dasd_device *device = block->base;
5435
5436         switch (cmd) {
5437         case BIODASDGATTR:
5438                 return dasd_eckd_get_attrib(device, argp);
5439         case BIODASDSATTR:
5440                 return dasd_eckd_set_attrib(device, argp);
5441         case BIODASDPSRD:
5442                 return dasd_eckd_performance(device, argp);
5443         case BIODASDRLSE:
5444                 return dasd_eckd_release(device);
5445         case BIODASDRSRV:
5446                 return dasd_eckd_reserve(device);
5447         case BIODASDSLCK:
5448                 return dasd_eckd_steal_lock(device);
5449         case BIODASDSNID:
5450                 return dasd_eckd_snid(device, argp);
5451         case BIODASDSYMMIO:
5452                 return dasd_symm_io(device, argp);
5453         default:
5454                 return -ENOTTY;
5455         }
5456 }
5457
5458 /*
5459  * Dump the range of CCWs into 'page' buffer
5460  * and return number of printed chars.
5461  */
5462 static int
5463 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
5464 {
5465         int len, count;
5466         char *datap;
5467
5468         len = 0;
5469         while (from <= to) {
5470                 len += sprintf(page + len, PRINTK_HEADER
5471                                " CCW %p: %08X %08X DAT:",
5472                                from, ((int *) from)[0], ((int *) from)[1]);
5473
5474                 /* get pointer to data (consider IDALs) */
5475                 if (from->flags & CCW_FLAG_IDA)
5476                         datap = (char *) *((addr_t *) (addr_t) from->cda);
5477                 else
5478                         datap = (char *) ((addr_t) from->cda);
5479
5480                 /* dump data (max 32 bytes) */
5481                 for (count = 0; count < from->count && count < 32; count++) {
5482                         if (count % 8 == 0) len += sprintf(page + len, " ");
5483                         if (count % 4 == 0) len += sprintf(page + len, " ");
5484                         len += sprintf(page + len, "%02x", datap[count]);
5485                 }
5486                 len += sprintf(page + len, "\n");
5487                 from++;
5488         }
5489         return len;
5490 }
5491
5492 static void
5493 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
5494                          char *reason)
5495 {
5496         u64 *sense;
5497         u64 *stat;
5498
5499         sense = (u64 *) dasd_get_sense(irb);
5500         stat = (u64 *) &irb->scsw;
5501         if (sense) {
5502                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
5503                               "%016llx %016llx %016llx %016llx",
5504                               reason, *stat, *((u32 *) (stat + 1)),
5505                               sense[0], sense[1], sense[2], sense[3]);
5506         } else {
5507                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
5508                               reason, *stat, *((u32 *) (stat + 1)),
5509                               "NO VALID SENSE");
5510         }
5511 }
5512
5513 /*
5514  * Print sense data and related channel program.
5515  * Parts are printed because printk buffer is only 1024 bytes.
5516  */
5517 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
5518                                  struct dasd_ccw_req *req, struct irb *irb)
5519 {
5520         char *page;
5521         struct ccw1 *first, *last, *fail, *from, *to;
5522         int len, sl, sct;
5523
5524         page = (char *) get_zeroed_page(GFP_ATOMIC);
5525         if (page == NULL) {
5526                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5527                               "No memory to dump sense data\n");
5528                 return;
5529         }
5530         /* dump the sense data */
5531         len = sprintf(page, PRINTK_HEADER
5532                       " I/O status report for device %s:\n",
5533                       dev_name(&device->cdev->dev));
5534         len += sprintf(page + len, PRINTK_HEADER
5535                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5536                        "CS:%02X RC:%d\n",
5537                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5538                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5539                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5540                        req ? req->intrc : 0);
5541         len += sprintf(page + len, PRINTK_HEADER
5542                        " device %s: Failing CCW: %p\n",
5543                        dev_name(&device->cdev->dev),
5544                        (void *) (addr_t) irb->scsw.cmd.cpa);
5545         if (irb->esw.esw0.erw.cons) {
5546                 for (sl = 0; sl < 4; sl++) {
5547                         len += sprintf(page + len, PRINTK_HEADER
5548                                        " Sense(hex) %2d-%2d:",
5549                                        (8 * sl), ((8 * sl) + 7));
5550
5551                         for (sct = 0; sct < 8; sct++) {
5552                                 len += sprintf(page + len, " %02x",
5553                                                irb->ecw[8 * sl + sct]);
5554                         }
5555                         len += sprintf(page + len, "\n");
5556                 }
5557
5558                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
5559                         /* 24 Byte Sense Data */
5560                         sprintf(page + len, PRINTK_HEADER
5561                                 " 24 Byte: %x MSG %x, "
5562                                 "%s MSGb to SYSOP\n",
5563                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
5564                                 irb->ecw[1] & 0x10 ? "" : "no");
5565                 } else {
5566                         /* 32 Byte Sense Data */
5567                         sprintf(page + len, PRINTK_HEADER
5568                                 " 32 Byte: Format: %x "
5569                                 "Exception class %x\n",
5570                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
5571                 }
5572         } else {
5573                 sprintf(page + len, PRINTK_HEADER
5574                         " SORRY - NO VALID SENSE AVAILABLE\n");
5575         }
5576         printk(KERN_ERR "%s", page);
5577
5578         if (req) {
5579                 /* req == NULL for unsolicited interrupts */
5580                 /* dump the Channel Program (max 140 Bytes per line) */
5581                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
5582                 first = req->cpaddr;
5583                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
5584                 to = min(first + 6, last);
5585                 len = sprintf(page, PRINTK_HEADER
5586                               " Related CP in req: %p\n", req);
5587                 dasd_eckd_dump_ccw_range(first, to, page + len);
5588                 printk(KERN_ERR "%s", page);
5589
5590                 /* print failing CCW area (maximum 4) */
5591                 /* scsw->cda is either valid or zero  */
5592                 len = 0;
5593                 from = ++to;
5594                 fail = (struct ccw1 *)(addr_t)
5595                                 irb->scsw.cmd.cpa; /* failing CCW */
5596                 if (from <  fail - 2) {
5597                         from = fail - 2;     /* there is a gap - print header */
5598                         len += sprintf(page, PRINTK_HEADER "......\n");
5599                 }
5600                 to = min(fail + 1, last);
5601                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
5602
5603                 /* print last CCWs (maximum 2) */
5604                 from = max(from, ++to);
5605                 if (from < last - 1) {
5606                         from = last - 1;     /* there is a gap - print header */
5607                         len += sprintf(page + len, PRINTK_HEADER "......\n");
5608                 }
5609                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
5610                 if (len > 0)
5611                         printk(KERN_ERR "%s", page);
5612         }
5613         free_page((unsigned long) page);
5614 }
5615
5616
5617 /*
5618  * Print sense data from a tcw.
5619  */
5620 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
5621                                  struct dasd_ccw_req *req, struct irb *irb)
5622 {
5623         char *page;
5624         int len, sl, sct, residual;
5625         struct tsb *tsb;
5626         u8 *sense, *rcq;
5627
5628         page = (char *) get_zeroed_page(GFP_ATOMIC);
5629         if (page == NULL) {
5630                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
5631                             "No memory to dump sense data");
5632                 return;
5633         }
5634         /* dump the sense data */
5635         len = sprintf(page, PRINTK_HEADER
5636                       " I/O status report for device %s:\n",
5637                       dev_name(&device->cdev->dev));
5638         len += sprintf(page + len, PRINTK_HEADER
5639                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5640                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
5641                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5642                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5643                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5644                        irb->scsw.tm.fcxs,
5645                        (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
5646                        req ? req->intrc : 0);
5647         len += sprintf(page + len, PRINTK_HEADER
5648                        " device %s: Failing TCW: %p\n",
5649                        dev_name(&device->cdev->dev),
5650                        (void *) (addr_t) irb->scsw.tm.tcw);
5651
5652         tsb = NULL;
5653         sense = NULL;
5654         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
5655                 tsb = tcw_get_tsb(
5656                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
5657
5658         if (tsb) {
5659                 len += sprintf(page + len, PRINTK_HEADER
5660                                " tsb->length %d\n", tsb->length);
5661                 len += sprintf(page + len, PRINTK_HEADER
5662                                " tsb->flags %x\n", tsb->flags);
5663                 len += sprintf(page + len, PRINTK_HEADER
5664                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
5665                 len += sprintf(page + len, PRINTK_HEADER
5666                                " tsb->count %d\n", tsb->count);
5667                 residual = tsb->count - 28;
5668                 len += sprintf(page + len, PRINTK_HEADER
5669                                " residual %d\n", residual);
5670
5671                 switch (tsb->flags & 0x07) {
5672                 case 1: /* tsa_iostat */
5673                         len += sprintf(page + len, PRINTK_HEADER
5674                                " tsb->tsa.iostat.dev_time %d\n",
5675                                        tsb->tsa.iostat.dev_time);
5676                         len += sprintf(page + len, PRINTK_HEADER
5677                                " tsb->tsa.iostat.def_time %d\n",
5678                                        tsb->tsa.iostat.def_time);
5679                         len += sprintf(page + len, PRINTK_HEADER
5680                                " tsb->tsa.iostat.queue_time %d\n",
5681                                        tsb->tsa.iostat.queue_time);
5682                         len += sprintf(page + len, PRINTK_HEADER
5683                                " tsb->tsa.iostat.dev_busy_time %d\n",
5684                                        tsb->tsa.iostat.dev_busy_time);
5685                         len += sprintf(page + len, PRINTK_HEADER
5686                                " tsb->tsa.iostat.dev_act_time %d\n",
5687                                        tsb->tsa.iostat.dev_act_time);
5688                         sense = tsb->tsa.iostat.sense;
5689                         break;
5690                 case 2: /* ts_ddpc */
5691                         len += sprintf(page + len, PRINTK_HEADER
5692                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
5693                         for (sl = 0; sl < 2; sl++) {
5694                                 len += sprintf(page + len, PRINTK_HEADER
5695                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
5696                                                (8 * sl), ((8 * sl) + 7));
5697                                 rcq = tsb->tsa.ddpc.rcq;
5698                                 for (sct = 0; sct < 8; sct++) {
5699                                         len += sprintf(page + len, " %02x",
5700                                                        rcq[8 * sl + sct]);
5701                                 }
5702                                 len += sprintf(page + len, "\n");
5703                         }
5704                         sense = tsb->tsa.ddpc.sense;
5705                         break;
5706                 case 3: /* tsa_intrg */
5707                         len += sprintf(page + len, PRINTK_HEADER
5708                                       " tsb->tsa.intrg.: not supported yet\n");
5709                         break;
5710                 }
5711
5712                 if (sense) {
5713                         for (sl = 0; sl < 4; sl++) {
5714                                 len += sprintf(page + len, PRINTK_HEADER
5715                                                " Sense(hex) %2d-%2d:",
5716                                                (8 * sl), ((8 * sl) + 7));
5717                                 for (sct = 0; sct < 8; sct++) {
5718                                         len += sprintf(page + len, " %02x",
5719                                                        sense[8 * sl + sct]);
5720                                 }
5721                                 len += sprintf(page + len, "\n");
5722                         }
5723
5724                         if (sense[27] & DASD_SENSE_BIT_0) {
5725                                 /* 24 Byte Sense Data */
5726                                 sprintf(page + len, PRINTK_HEADER
5727                                         " 24 Byte: %x MSG %x, "
5728                                         "%s MSGb to SYSOP\n",
5729                                         sense[7] >> 4, sense[7] & 0x0f,
5730                                         sense[1] & 0x10 ? "" : "no");
5731                         } else {
5732                                 /* 32 Byte Sense Data */
5733                                 sprintf(page + len, PRINTK_HEADER
5734                                         " 32 Byte: Format: %x "
5735                                         "Exception class %x\n",
5736                                         sense[6] & 0x0f, sense[22] >> 4);
5737                         }
5738                 } else {
5739                         sprintf(page + len, PRINTK_HEADER
5740                                 " SORRY - NO VALID SENSE AVAILABLE\n");
5741                 }
5742         } else {
5743                 sprintf(page + len, PRINTK_HEADER
5744                         " SORRY - NO TSB DATA AVAILABLE\n");
5745         }
5746         printk(KERN_ERR "%s", page);
5747         free_page((unsigned long) page);
5748 }
5749
5750 static void dasd_eckd_dump_sense(struct dasd_device *device,
5751                                  struct dasd_ccw_req *req, struct irb *irb)
5752 {
5753         u8 *sense = dasd_get_sense(irb);
5754
5755         if (scsw_is_tm(&irb->scsw)) {
5756                 /*
5757                  * In some cases the 'File Protected' or 'Incorrect Length'
5758                  * error might be expected and log messages shouldn't be written
5759                  * then. Check if the according suppress bit is set.
5760                  */
5761                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
5762                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
5763                         return;
5764                 if (scsw_cstat(&irb->scsw) == 0x40 &&
5765                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
5766                         return;
5767
5768                 dasd_eckd_dump_sense_tcw(device, req, irb);
5769         } else {
5770                 /*
5771                  * In some cases the 'Command Reject' or 'No Record Found'
5772                  * error might be expected and log messages shouldn't be
5773                  * written then. Check if the according suppress bit is set.
5774                  */
5775                 if (sense && sense[0] & SNS0_CMD_REJECT &&
5776                     test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
5777                         return;
5778
5779                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
5780                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
5781                         return;
5782
5783                 dasd_eckd_dump_sense_ccw(device, req, irb);
5784         }
5785 }
5786
5787 static int dasd_eckd_reload_device(struct dasd_device *device)
5788 {
5789         struct dasd_eckd_private *private = device->private;
5790         int rc, old_base;
5791         char print_uid[60];
5792         struct dasd_uid uid;
5793         unsigned long flags;
5794
5795         /*
5796          * remove device from alias handling to prevent new requests
5797          * from being scheduled on the wrong alias device
5798          */
5799         dasd_alias_remove_device(device);
5800
5801         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5802         old_base = private->uid.base_unit_addr;
5803         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5804
5805         /* Read Configuration Data */
5806         rc = dasd_eckd_read_conf(device);
5807         if (rc)
5808                 goto out_err;
5809
5810         dasd_eckd_read_fc_security(device);
5811
5812         rc = dasd_eckd_generate_uid(device);
5813         if (rc)
5814                 goto out_err;
5815         /*
5816          * update unit address configuration and
5817          * add device to alias management
5818          */
5819         dasd_alias_update_add_device(device);
5820
5821         dasd_eckd_get_uid(device, &uid);
5822
5823         if (old_base != uid.base_unit_addr) {
5824                 dasd_eckd_get_uid_string(&private->conf, print_uid);
5825                 dev_info(&device->cdev->dev,
5826                          "An Alias device was reassigned to a new base device "
5827                          "with UID: %s\n", print_uid);
5828         }
5829         return 0;
5830
5831 out_err:
5832         return -1;
5833 }
5834
5835 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5836                                          struct dasd_rssd_messages *messages,
5837                                          __u8 lpum)
5838 {
5839         struct dasd_rssd_messages *message_buf;
5840         struct dasd_psf_prssd_data *prssdp;
5841         struct dasd_ccw_req *cqr;
5842         struct ccw1 *ccw;
5843         int rc;
5844
5845         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5846                                    (sizeof(struct dasd_psf_prssd_data) +
5847                                     sizeof(struct dasd_rssd_messages)),
5848                                    device, NULL);
5849         if (IS_ERR(cqr)) {
5850                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5851                                 "Could not allocate read message buffer request");
5852                 return PTR_ERR(cqr);
5853         }
5854
5855         cqr->lpm = lpum;
5856 retry:
5857         cqr->startdev = device;
5858         cqr->memdev = device;
5859         cqr->block = NULL;
5860         cqr->expires = 10 * HZ;
5861         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5862         /* dasd_sleep_on_immediatly does not do complex error
5863          * recovery so clear erp flag and set retry counter to
5864          * do basic erp */
5865         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5866         cqr->retries = 256;
5867
5868         /* Prepare for Read Subsystem Data */
5869         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5870         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5871         prssdp->order = PSF_ORDER_PRSSD;
5872         prssdp->suborder = 0x03;        /* Message Buffer */
5873         /* all other bytes of prssdp must be zero */
5874
5875         ccw = cqr->cpaddr;
5876         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5877         ccw->count = sizeof(struct dasd_psf_prssd_data);
5878         ccw->flags |= CCW_FLAG_CC;
5879         ccw->flags |= CCW_FLAG_SLI;
5880         ccw->cda = (__u32)(addr_t) prssdp;
5881
5882         /* Read Subsystem Data - message buffer */
5883         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5884         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5885
5886         ccw++;
5887         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5888         ccw->count = sizeof(struct dasd_rssd_messages);
5889         ccw->flags |= CCW_FLAG_SLI;
5890         ccw->cda = (__u32)(addr_t) message_buf;
5891
5892         cqr->buildclk = get_tod_clock();
5893         cqr->status = DASD_CQR_FILLED;
5894         rc = dasd_sleep_on_immediatly(cqr);
5895         if (rc == 0) {
5896                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5897                 message_buf = (struct dasd_rssd_messages *)
5898                         (prssdp + 1);
5899                 memcpy(messages, message_buf,
5900                        sizeof(struct dasd_rssd_messages));
5901         } else if (cqr->lpm) {
5902                 /*
5903                  * on z/VM we might not be able to do I/O on the requested path
5904                  * but instead we get the required information on any path
5905                  * so retry with open path mask
5906                  */
5907                 cqr->lpm = 0;
5908                 goto retry;
5909         } else
5910                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5911                                 "Reading messages failed with rc=%d\n"
5912                                 , rc);
5913         dasd_sfree_request(cqr, cqr->memdev);
5914         return rc;
5915 }
5916
5917 static int dasd_eckd_query_host_access(struct dasd_device *device,
5918                                        struct dasd_psf_query_host_access *data)
5919 {
5920         struct dasd_eckd_private *private = device->private;
5921         struct dasd_psf_query_host_access *host_access;
5922         struct dasd_psf_prssd_data *prssdp;
5923         struct dasd_ccw_req *cqr;
5924         struct ccw1 *ccw;
5925         int rc;
5926
5927         /* not available for HYPER PAV alias devices */
5928         if (!device->block && private->lcu->pav == HYPER_PAV)
5929                 return -EOPNOTSUPP;
5930
5931         /* may not be supported by the storage server */
5932         if (!(private->features.feature[14] & 0x80))
5933                 return -EOPNOTSUPP;
5934
5935         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5936                                    sizeof(struct dasd_psf_prssd_data) + 1,
5937                                    device, NULL);
5938         if (IS_ERR(cqr)) {
5939                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5940                                 "Could not allocate read message buffer request");
5941                 return PTR_ERR(cqr);
5942         }
5943         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5944         if (!host_access) {
5945                 dasd_sfree_request(cqr, device);
5946                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5947                                 "Could not allocate host_access buffer");
5948                 return -ENOMEM;
5949         }
5950         cqr->startdev = device;
5951         cqr->memdev = device;
5952         cqr->block = NULL;
5953         cqr->retries = 256;
5954         cqr->expires = 10 * HZ;
5955
5956         /* Prepare for Read Subsystem Data */
5957         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5958         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5959         prssdp->order = PSF_ORDER_PRSSD;
5960         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5961         /* LSS and Volume that will be queried */
5962         prssdp->lss = private->conf.ned->ID;
5963         prssdp->volume = private->conf.ned->unit_addr;
5964         /* all other bytes of prssdp must be zero */
5965
5966         ccw = cqr->cpaddr;
5967         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5968         ccw->count = sizeof(struct dasd_psf_prssd_data);
5969         ccw->flags |= CCW_FLAG_CC;
5970         ccw->flags |= CCW_FLAG_SLI;
5971         ccw->cda = (__u32)(addr_t) prssdp;
5972
5973         /* Read Subsystem Data - query host access */
5974         ccw++;
5975         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5976         ccw->count = sizeof(struct dasd_psf_query_host_access);
5977         ccw->flags |= CCW_FLAG_SLI;
5978         ccw->cda = (__u32)(addr_t) host_access;
5979
5980         cqr->buildclk = get_tod_clock();
5981         cqr->status = DASD_CQR_FILLED;
5982         /* the command might not be supported, suppress error message */
5983         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5984         rc = dasd_sleep_on_interruptible(cqr);
5985         if (rc == 0) {
5986                 *data = *host_access;
5987         } else {
5988                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5989                                 "Reading host access data failed with rc=%d\n",
5990                                 rc);
5991                 rc = -EOPNOTSUPP;
5992         }
5993
5994         dasd_sfree_request(cqr, cqr->memdev);
5995         kfree(host_access);
5996         return rc;
5997 }
5998 /*
5999  * return number of grouped devices
6000  */
6001 static int dasd_eckd_host_access_count(struct dasd_device *device)
6002 {
6003         struct dasd_psf_query_host_access *access;
6004         struct dasd_ckd_path_group_entry *entry;
6005         struct dasd_ckd_host_information *info;
6006         int count = 0;
6007         int rc, i;
6008
6009         access = kzalloc(sizeof(*access), GFP_NOIO);
6010         if (!access) {
6011                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6012                                 "Could not allocate access buffer");
6013                 return -ENOMEM;
6014         }
6015         rc = dasd_eckd_query_host_access(device, access);
6016         if (rc) {
6017                 kfree(access);
6018                 return rc;
6019         }
6020
6021         info = (struct dasd_ckd_host_information *)
6022                 access->host_access_information;
6023         for (i = 0; i < info->entry_count; i++) {
6024                 entry = (struct dasd_ckd_path_group_entry *)
6025                         (info->entry + i * info->entry_size);
6026                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
6027                         count++;
6028         }
6029
6030         kfree(access);
6031         return count;
6032 }
6033
6034 /*
6035  * write host access information to a sequential file
6036  */
6037 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
6038 {
6039         struct dasd_psf_query_host_access *access;
6040         struct dasd_ckd_path_group_entry *entry;
6041         struct dasd_ckd_host_information *info;
6042         char sysplex[9] = "";
6043         int rc, i;
6044
6045         access = kzalloc(sizeof(*access), GFP_NOIO);
6046         if (!access) {
6047                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6048                                 "Could not allocate access buffer");
6049                 return -ENOMEM;
6050         }
6051         rc = dasd_eckd_query_host_access(device, access);
6052         if (rc) {
6053                 kfree(access);
6054                 return rc;
6055         }
6056
6057         info = (struct dasd_ckd_host_information *)
6058                 access->host_access_information;
6059         for (i = 0; i < info->entry_count; i++) {
6060                 entry = (struct dasd_ckd_path_group_entry *)
6061                         (info->entry + i * info->entry_size);
6062                 /* PGID */
6063                 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
6064                 /* FLAGS */
6065                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
6066                 /* SYSPLEX NAME */
6067                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
6068                 EBCASC(sysplex, sizeof(sysplex));
6069                 seq_printf(m, "sysplex_name %8s\n", sysplex);
6070                 /* SUPPORTED CYLINDER */
6071                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
6072                 /* TIMESTAMP */
6073                 seq_printf(m, "timestamp %lu\n", (unsigned long)
6074                            entry->timestamp);
6075         }
6076         kfree(access);
6077
6078         return 0;
6079 }
6080
6081 /*
6082  * Perform Subsystem Function - CUIR response
6083  */
6084 static int
6085 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
6086                             __u32 message_id, __u8 lpum)
6087 {
6088         struct dasd_psf_cuir_response *psf_cuir;
6089         int pos = pathmask_to_pos(lpum);
6090         struct dasd_ccw_req *cqr;
6091         struct ccw1 *ccw;
6092         int rc;
6093
6094         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
6095                                    sizeof(struct dasd_psf_cuir_response),
6096                                    device, NULL);
6097
6098         if (IS_ERR(cqr)) {
6099                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6100                            "Could not allocate PSF-CUIR request");
6101                 return PTR_ERR(cqr);
6102         }
6103
6104         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
6105         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
6106         psf_cuir->cc = response;
6107         psf_cuir->chpid = device->path[pos].chpid;
6108         psf_cuir->message_id = message_id;
6109         psf_cuir->cssid = device->path[pos].cssid;
6110         psf_cuir->ssid = device->path[pos].ssid;
6111         ccw = cqr->cpaddr;
6112         ccw->cmd_code = DASD_ECKD_CCW_PSF;
6113         ccw->cda = (__u32)(addr_t)psf_cuir;
6114         ccw->flags = CCW_FLAG_SLI;
6115         ccw->count = sizeof(struct dasd_psf_cuir_response);
6116
6117         cqr->startdev = device;
6118         cqr->memdev = device;
6119         cqr->block = NULL;
6120         cqr->retries = 256;
6121         cqr->expires = 10*HZ;
6122         cqr->buildclk = get_tod_clock();
6123         cqr->status = DASD_CQR_FILLED;
6124         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
6125
6126         rc = dasd_sleep_on(cqr);
6127
6128         dasd_sfree_request(cqr, cqr->memdev);
6129         return rc;
6130 }
6131
6132 /*
6133  * return configuration data that is referenced by record selector
6134  * if a record selector is specified or per default return the
6135  * conf_data pointer for the path specified by lpum
6136  */
6137 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
6138                                                      __u8 lpum,
6139                                                      struct dasd_cuir_message *cuir)
6140 {
6141         struct dasd_conf_data *conf_data;
6142         int path, pos;
6143
6144         if (cuir->record_selector == 0)
6145                 goto out;
6146         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
6147                 conf_data = device->path[pos].conf_data;
6148                 if (conf_data->gneq.record_selector ==
6149                     cuir->record_selector)
6150                         return conf_data;
6151         }
6152 out:
6153         return device->path[pathmask_to_pos(lpum)].conf_data;
6154 }
6155
6156 /*
6157  * This function determines the scope of a reconfiguration request by
6158  * analysing the path and device selection data provided in the CUIR request.
6159  * Returns a path mask containing CUIR affected paths for the give device.
6160  *
6161  * If the CUIR request does not contain the required information return the
6162  * path mask of the path the attention message for the CUIR request was reveived
6163  * on.
6164  */
6165 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
6166                                 struct dasd_cuir_message *cuir)
6167 {
6168         struct dasd_conf_data *ref_conf_data;
6169         unsigned long bitmask = 0, mask = 0;
6170         struct dasd_conf_data *conf_data;
6171         unsigned int pos, path;
6172         char *ref_gneq, *gneq;
6173         char *ref_ned, *ned;
6174         int tbcpm = 0;
6175
6176         /* if CUIR request does not specify the scope use the path
6177            the attention message was presented on */
6178         if (!cuir->ned_map ||
6179             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
6180                 return lpum;
6181
6182         /* get reference conf data */
6183         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
6184         /* reference ned is determined by ned_map field */
6185         pos = 8 - ffs(cuir->ned_map);
6186         ref_ned = (char *)&ref_conf_data->neds[pos];
6187         ref_gneq = (char *)&ref_conf_data->gneq;
6188         /* transfer 24 bit neq_map to mask */
6189         mask = cuir->neq_map[2];
6190         mask |= cuir->neq_map[1] << 8;
6191         mask |= cuir->neq_map[0] << 16;
6192
6193         for (path = 0; path < 8; path++) {
6194                 /* initialise data per path */
6195                 bitmask = mask;
6196                 conf_data = device->path[path].conf_data;
6197                 pos = 8 - ffs(cuir->ned_map);
6198                 ned = (char *) &conf_data->neds[pos];
6199                 /* compare reference ned and per path ned */
6200                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
6201                         continue;
6202                 gneq = (char *)&conf_data->gneq;
6203                 /* compare reference gneq and per_path gneq under
6204                    24 bit mask where mask bit 0 equals byte 7 of
6205                    the gneq and mask bit 24 equals byte 31 */
6206                 while (bitmask) {
6207                         pos = ffs(bitmask) - 1;
6208                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
6209                             != 0)
6210                                 break;
6211                         clear_bit(pos, &bitmask);
6212                 }
6213                 if (bitmask)
6214                         continue;
6215                 /* device and path match the reference values
6216                    add path to CUIR scope */
6217                 tbcpm |= 0x80 >> path;
6218         }
6219         return tbcpm;
6220 }
6221
6222 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
6223                                        unsigned long paths, int action)
6224 {
6225         int pos;
6226
6227         while (paths) {
6228                 /* get position of bit in mask */
6229                 pos = 8 - ffs(paths);
6230                 /* get channel path descriptor from this position */
6231                 if (action == CUIR_QUIESCE)
6232                         pr_warn("Service on the storage server caused path %x.%02x to go offline",
6233                                 device->path[pos].cssid,
6234                                 device->path[pos].chpid);
6235                 else if (action == CUIR_RESUME)
6236                         pr_info("Path %x.%02x is back online after service on the storage server",
6237                                 device->path[pos].cssid,
6238                                 device->path[pos].chpid);
6239                 clear_bit(7 - pos, &paths);
6240         }
6241 }
6242
6243 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
6244                                       struct dasd_cuir_message *cuir)
6245 {
6246         unsigned long tbcpm;
6247
6248         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
6249         /* nothing to do if path is not in use */
6250         if (!(dasd_path_get_opm(device) & tbcpm))
6251                 return 0;
6252         if (!(dasd_path_get_opm(device) & ~tbcpm)) {
6253                 /* no path would be left if the CUIR action is taken
6254                    return error */
6255                 return -EINVAL;
6256         }
6257         /* remove device from operational path mask */
6258         dasd_path_remove_opm(device, tbcpm);
6259         dasd_path_add_cuirpm(device, tbcpm);
6260         return tbcpm;
6261 }
6262
6263 /*
6264  * walk through all devices and build a path mask to quiesce them
6265  * return an error if the last path to a device would be removed
6266  *
6267  * if only part of the devices are quiesced and an error
6268  * occurs no onlining necessary, the storage server will
6269  * notify the already set offline devices again
6270  */
6271 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
6272                                   struct dasd_cuir_message *cuir)
6273 {
6274         struct dasd_eckd_private *private = device->private;
6275         struct alias_pav_group *pavgroup, *tempgroup;
6276         struct dasd_device *dev, *n;
6277         unsigned long paths = 0;
6278         unsigned long flags;
6279         int tbcpm;
6280
6281         /* active devices */
6282         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6283                                  alias_list) {
6284                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6285                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6286                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6287                 if (tbcpm < 0)
6288                         goto out_err;
6289                 paths |= tbcpm;
6290         }
6291         /* inactive devices */
6292         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6293                                  alias_list) {
6294                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6295                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6296                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6297                 if (tbcpm < 0)
6298                         goto out_err;
6299                 paths |= tbcpm;
6300         }
6301         /* devices in PAV groups */
6302         list_for_each_entry_safe(pavgroup, tempgroup,
6303                                  &private->lcu->grouplist, group) {
6304                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6305                                          alias_list) {
6306                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6307                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6308                         spin_unlock_irqrestore(
6309                                 get_ccwdev_lock(dev->cdev), flags);
6310                         if (tbcpm < 0)
6311                                 goto out_err;
6312                         paths |= tbcpm;
6313                 }
6314                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6315                                          alias_list) {
6316                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6317                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6318                         spin_unlock_irqrestore(
6319                                 get_ccwdev_lock(dev->cdev), flags);
6320                         if (tbcpm < 0)
6321                                 goto out_err;
6322                         paths |= tbcpm;
6323                 }
6324         }
6325         /* notify user about all paths affected by CUIR action */
6326         dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
6327         return 0;
6328 out_err:
6329         return tbcpm;
6330 }
6331
6332 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
6333                                  struct dasd_cuir_message *cuir)
6334 {
6335         struct dasd_eckd_private *private = device->private;
6336         struct alias_pav_group *pavgroup, *tempgroup;
6337         struct dasd_device *dev, *n;
6338         unsigned long paths = 0;
6339         int tbcpm;
6340
6341         /*
6342          * the path may have been added through a generic path event before
6343          * only trigger path verification if the path is not already in use
6344          */
6345         list_for_each_entry_safe(dev, n,
6346                                  &private->lcu->active_devices,
6347                                  alias_list) {
6348                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6349                 paths |= tbcpm;
6350                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6351                         dasd_path_add_tbvpm(dev, tbcpm);
6352                         dasd_schedule_device_bh(dev);
6353                 }
6354         }
6355         list_for_each_entry_safe(dev, n,
6356                                  &private->lcu->inactive_devices,
6357                                  alias_list) {
6358                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6359                 paths |= tbcpm;
6360                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6361                         dasd_path_add_tbvpm(dev, tbcpm);
6362                         dasd_schedule_device_bh(dev);
6363                 }
6364         }
6365         /* devices in PAV groups */
6366         list_for_each_entry_safe(pavgroup, tempgroup,
6367                                  &private->lcu->grouplist,
6368                                  group) {
6369                 list_for_each_entry_safe(dev, n,
6370                                          &pavgroup->baselist,
6371                                          alias_list) {
6372                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6373                         paths |= tbcpm;
6374                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6375                                 dasd_path_add_tbvpm(dev, tbcpm);
6376                                 dasd_schedule_device_bh(dev);
6377                         }
6378                 }
6379                 list_for_each_entry_safe(dev, n,
6380                                          &pavgroup->aliaslist,
6381                                          alias_list) {
6382                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6383                         paths |= tbcpm;
6384                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6385                                 dasd_path_add_tbvpm(dev, tbcpm);
6386                                 dasd_schedule_device_bh(dev);
6387                         }
6388                 }
6389         }
6390         /* notify user about all paths affected by CUIR action */
6391         dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
6392         return 0;
6393 }
6394
6395 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
6396                                  __u8 lpum)
6397 {
6398         struct dasd_cuir_message *cuir = messages;
6399         int response;
6400
6401         DBF_DEV_EVENT(DBF_WARNING, device,
6402                       "CUIR request: %016llx %016llx %016llx %08x",
6403                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
6404                       ((u32 *)cuir)[3]);
6405
6406         if (cuir->code == CUIR_QUIESCE) {
6407                 /* quiesce */
6408                 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
6409                         response = PSF_CUIR_LAST_PATH;
6410                 else
6411                         response = PSF_CUIR_COMPLETED;
6412         } else if (cuir->code == CUIR_RESUME) {
6413                 /* resume */
6414                 dasd_eckd_cuir_resume(device, lpum, cuir);
6415                 response = PSF_CUIR_COMPLETED;
6416         } else
6417                 response = PSF_CUIR_NOT_SUPPORTED;
6418
6419         dasd_eckd_psf_cuir_response(device, response,
6420                                     cuir->message_id, lpum);
6421         DBF_DEV_EVENT(DBF_WARNING, device,
6422                       "CUIR response: %d on message ID %08x", response,
6423                       cuir->message_id);
6424         /* to make sure there is no attention left schedule work again */
6425         device->discipline->check_attention(device, lpum);
6426 }
6427
6428 static void dasd_eckd_oos_resume(struct dasd_device *device)
6429 {
6430         struct dasd_eckd_private *private = device->private;
6431         struct alias_pav_group *pavgroup, *tempgroup;
6432         struct dasd_device *dev, *n;
6433         unsigned long flags;
6434
6435         spin_lock_irqsave(&private->lcu->lock, flags);
6436         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6437                                  alias_list) {
6438                 if (dev->stopped & DASD_STOPPED_NOSPC)
6439                         dasd_generic_space_avail(dev);
6440         }
6441         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6442                                  alias_list) {
6443                 if (dev->stopped & DASD_STOPPED_NOSPC)
6444                         dasd_generic_space_avail(dev);
6445         }
6446         /* devices in PAV groups */
6447         list_for_each_entry_safe(pavgroup, tempgroup,
6448                                  &private->lcu->grouplist,
6449                                  group) {
6450                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6451                                          alias_list) {
6452                         if (dev->stopped & DASD_STOPPED_NOSPC)
6453                                 dasd_generic_space_avail(dev);
6454                 }
6455                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6456                                          alias_list) {
6457                         if (dev->stopped & DASD_STOPPED_NOSPC)
6458                                 dasd_generic_space_avail(dev);
6459                 }
6460         }
6461         spin_unlock_irqrestore(&private->lcu->lock, flags);
6462 }
6463
6464 static void dasd_eckd_handle_oos(struct dasd_device *device, void *messages,
6465                                  __u8 lpum)
6466 {
6467         struct dasd_oos_message *oos = messages;
6468
6469         switch (oos->code) {
6470         case REPO_WARN:
6471         case POOL_WARN:
6472                 dev_warn(&device->cdev->dev,
6473                          "Extent pool usage has reached a critical value\n");
6474                 dasd_eckd_oos_resume(device);
6475                 break;
6476         case REPO_EXHAUST:
6477         case POOL_EXHAUST:
6478                 dev_warn(&device->cdev->dev,
6479                          "Extent pool is exhausted\n");
6480                 break;
6481         case REPO_RELIEVE:
6482         case POOL_RELIEVE:
6483                 dev_info(&device->cdev->dev,
6484                          "Extent pool physical space constraint has been relieved\n");
6485                 break;
6486         }
6487
6488         /* In any case, update related data */
6489         dasd_eckd_read_ext_pool_info(device);
6490
6491         /* to make sure there is no attention left schedule work again */
6492         device->discipline->check_attention(device, lpum);
6493 }
6494
6495 static void dasd_eckd_check_attention_work(struct work_struct *work)
6496 {
6497         struct check_attention_work_data *data;
6498         struct dasd_rssd_messages *messages;
6499         struct dasd_device *device;
6500         int rc;
6501
6502         data = container_of(work, struct check_attention_work_data, worker);
6503         device = data->device;
6504         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
6505         if (!messages) {
6506                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6507                               "Could not allocate attention message buffer");
6508                 goto out;
6509         }
6510         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
6511         if (rc)
6512                 goto out;
6513
6514         if (messages->length == ATTENTION_LENGTH_CUIR &&
6515             messages->format == ATTENTION_FORMAT_CUIR)
6516                 dasd_eckd_handle_cuir(device, messages, data->lpum);
6517         if (messages->length == ATTENTION_LENGTH_OOS &&
6518             messages->format == ATTENTION_FORMAT_OOS)
6519                 dasd_eckd_handle_oos(device, messages, data->lpum);
6520
6521 out:
6522         dasd_put_device(device);
6523         kfree(messages);
6524         kfree(data);
6525 }
6526
6527 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
6528 {
6529         struct check_attention_work_data *data;
6530
6531         data = kzalloc(sizeof(*data), GFP_ATOMIC);
6532         if (!data)
6533                 return -ENOMEM;
6534         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
6535         dasd_get_device(device);
6536         data->device = device;
6537         data->lpum = lpum;
6538         schedule_work(&data->worker);
6539         return 0;
6540 }
6541
6542 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
6543 {
6544         if (~lpum & dasd_path_get_opm(device)) {
6545                 dasd_path_add_nohpfpm(device, lpum);
6546                 dasd_path_remove_opm(device, lpum);
6547                 dev_err(&device->cdev->dev,
6548                         "Channel path %02X lost HPF functionality and is disabled\n",
6549                         lpum);
6550                 return 1;
6551         }
6552         return 0;
6553 }
6554
6555 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
6556 {
6557         struct dasd_eckd_private *private = device->private;
6558
6559         dev_err(&device->cdev->dev,
6560                 "High Performance FICON disabled\n");
6561         private->fcx_max_data = 0;
6562 }
6563
6564 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
6565 {
6566         struct dasd_eckd_private *private = device->private;
6567
6568         return private->fcx_max_data ? 1 : 0;
6569 }
6570
6571 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
6572                                        struct irb *irb)
6573 {
6574         struct dasd_eckd_private *private = device->private;
6575
6576         if (!private->fcx_max_data) {
6577                 /* sanity check for no HPF, the error makes no sense */
6578                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6579                               "Trying to disable HPF for a non HPF device");
6580                 return;
6581         }
6582         if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
6583                 dasd_eckd_disable_hpf_device(device);
6584         } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
6585                 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
6586                         return;
6587                 dasd_eckd_disable_hpf_device(device);
6588                 dasd_path_set_tbvpm(device,
6589                                   dasd_path_get_hpfpm(device));
6590         }
6591         /*
6592          * prevent that any new I/O ist started on the device and schedule a
6593          * requeue of existing requests
6594          */
6595         dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
6596         dasd_schedule_requeue(device);
6597 }
6598
6599 /*
6600  * Initialize block layer request queue.
6601  */
6602 static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
6603 {
6604         unsigned int logical_block_size = block->bp_block;
6605         struct request_queue *q = block->request_queue;
6606         struct dasd_device *device = block->base;
6607         int max;
6608
6609         if (device->features & DASD_FEATURE_USERAW) {
6610                 /*
6611                  * the max_blocks value for raw_track access is 256
6612                  * it is higher than the native ECKD value because we
6613                  * only need one ccw per track
6614                  * so the max_hw_sectors are
6615                  * 2048 x 512B = 1024kB = 16 tracks
6616                  */
6617                 max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
6618         } else {
6619                 max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
6620         }
6621         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
6622         q->limits.max_dev_sectors = max;
6623         blk_queue_logical_block_size(q, logical_block_size);
6624         blk_queue_max_hw_sectors(q, max);
6625         blk_queue_max_segments(q, USHRT_MAX);
6626         /* With page sized segments each segment can be translated into one idaw/tidaw */
6627         blk_queue_max_segment_size(q, PAGE_SIZE);
6628         blk_queue_segment_boundary(q, PAGE_SIZE - 1);
6629 }
6630
6631 static struct ccw_driver dasd_eckd_driver = {
6632         .driver = {
6633                 .name   = "dasd-eckd",
6634                 .owner  = THIS_MODULE,
6635                 .dev_groups = dasd_dev_groups,
6636         },
6637         .ids         = dasd_eckd_ids,
6638         .probe       = dasd_eckd_probe,
6639         .remove      = dasd_generic_remove,
6640         .set_offline = dasd_generic_set_offline,
6641         .set_online  = dasd_eckd_set_online,
6642         .notify      = dasd_generic_notify,
6643         .path_event  = dasd_generic_path_event,
6644         .shutdown    = dasd_generic_shutdown,
6645         .uc_handler  = dasd_generic_uc_handler,
6646         .int_class   = IRQIO_DAS,
6647 };
6648
6649 static struct dasd_discipline dasd_eckd_discipline = {
6650         .owner = THIS_MODULE,
6651         .name = "ECKD",
6652         .ebcname = "ECKD",
6653         .check_device = dasd_eckd_check_characteristics,
6654         .uncheck_device = dasd_eckd_uncheck_device,
6655         .do_analysis = dasd_eckd_do_analysis,
6656         .pe_handler = dasd_eckd_pe_handler,
6657         .basic_to_ready = dasd_eckd_basic_to_ready,
6658         .online_to_ready = dasd_eckd_online_to_ready,
6659         .basic_to_known = dasd_eckd_basic_to_known,
6660         .setup_blk_queue = dasd_eckd_setup_blk_queue,
6661         .fill_geometry = dasd_eckd_fill_geometry,
6662         .start_IO = dasd_start_IO,
6663         .term_IO = dasd_term_IO,
6664         .handle_terminated_request = dasd_eckd_handle_terminated_request,
6665         .format_device = dasd_eckd_format_device,
6666         .check_device_format = dasd_eckd_check_device_format,
6667         .erp_action = dasd_eckd_erp_action,
6668         .erp_postaction = dasd_eckd_erp_postaction,
6669         .check_for_device_change = dasd_eckd_check_for_device_change,
6670         .build_cp = dasd_eckd_build_alias_cp,
6671         .free_cp = dasd_eckd_free_alias_cp,
6672         .dump_sense = dasd_eckd_dump_sense,
6673         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
6674         .fill_info = dasd_eckd_fill_info,
6675         .ioctl = dasd_eckd_ioctl,
6676         .reload = dasd_eckd_reload_device,
6677         .get_uid = dasd_eckd_get_uid,
6678         .kick_validate = dasd_eckd_kick_validate_server,
6679         .check_attention = dasd_eckd_check_attention,
6680         .host_access_count = dasd_eckd_host_access_count,
6681         .hosts_print = dasd_hosts_print,
6682         .handle_hpf_error = dasd_eckd_handle_hpf_error,
6683         .disable_hpf = dasd_eckd_disable_hpf_device,
6684         .hpf_enabled = dasd_eckd_hpf_enabled,
6685         .reset_path = dasd_eckd_reset_path,
6686         .is_ese = dasd_eckd_is_ese,
6687         .space_allocated = dasd_eckd_space_allocated,
6688         .space_configured = dasd_eckd_space_configured,
6689         .logical_capacity = dasd_eckd_logical_capacity,
6690         .release_space = dasd_eckd_release_space,
6691         .ext_pool_id = dasd_eckd_ext_pool_id,
6692         .ext_size = dasd_eckd_ext_size,
6693         .ext_pool_cap_at_warnlevel = dasd_eckd_ext_pool_cap_at_warnlevel,
6694         .ext_pool_warn_thrshld = dasd_eckd_ext_pool_warn_thrshld,
6695         .ext_pool_oos = dasd_eckd_ext_pool_oos,
6696         .ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,
6697         .ese_format = dasd_eckd_ese_format,
6698         .ese_read = dasd_eckd_ese_read,
6699 };
6700
6701 static int __init
6702 dasd_eckd_init(void)
6703 {
6704         int ret;
6705
6706         ASCEBC(dasd_eckd_discipline.ebcname, 4);
6707         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
6708                                    GFP_KERNEL | GFP_DMA);
6709         if (!dasd_reserve_req)
6710                 return -ENOMEM;
6711         dasd_vol_info_req = kmalloc(sizeof(*dasd_vol_info_req),
6712                                     GFP_KERNEL | GFP_DMA);
6713         if (!dasd_vol_info_req)
6714                 return -ENOMEM;
6715         pe_handler_worker = kmalloc(sizeof(*pe_handler_worker),
6716                                     GFP_KERNEL | GFP_DMA);
6717         if (!pe_handler_worker) {
6718                 kfree(dasd_reserve_req);
6719                 kfree(dasd_vol_info_req);
6720                 return -ENOMEM;
6721         }
6722         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
6723         if (!rawpadpage) {
6724                 kfree(pe_handler_worker);
6725                 kfree(dasd_reserve_req);
6726                 kfree(dasd_vol_info_req);
6727                 return -ENOMEM;
6728         }
6729         ret = ccw_driver_register(&dasd_eckd_driver);
6730         if (!ret)
6731                 wait_for_device_probe();
6732         else {
6733                 kfree(pe_handler_worker);
6734                 kfree(dasd_reserve_req);
6735                 kfree(dasd_vol_info_req);
6736                 free_page((unsigned long)rawpadpage);
6737         }
6738         return ret;
6739 }
6740
6741 static void __exit
6742 dasd_eckd_cleanup(void)
6743 {
6744         ccw_driver_unregister(&dasd_eckd_driver);
6745         kfree(pe_handler_worker);
6746         kfree(dasd_reserve_req);
6747         free_page((unsigned long)rawpadpage);
6748 }
6749
6750 module_init(dasd_eckd_init);
6751 module_exit(dasd_eckd_cleanup);