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