drivers/s390/block/dasd_fba.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  * Bugreports.to..: <Linux390@de.ibm.com>
   4  * Copyright IBM Corp. 1999, 2009
   5  */
   6
   7 #define KMSG_COMPONENT "dasd-fba"
   8
   9 #include <linux/stddef.h>
  10 #include <linux/kernel.h>
  11 #include <asm/debug.h>
  12
  13 #include <linux/slab.h>
  14 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  15 #include <linux/bio.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18
  19 #include <asm/idals.h>
  20 #include <asm/ebcdic.h>
  21 #include <asm/io.h>
  22 #include <asm/ccwdev.h>
  23
  24 #include "dasd_int.h"
  25 #include "dasd_fba.h"
  26
  27 #ifdef PRINTK_HEADER
  28 #undef PRINTK_HEADER
  29 #endif                          /* PRINTK_HEADER */
  30 #define PRINTK_HEADER "dasd(fba):"
  31
  32 #define FBA_DEFAULT_RETRIES 32
  33
  34 #define DASD_FBA_CCW_WRITE 0x41
  35 #define DASD_FBA_CCW_READ 0x42
  36 #define DASD_FBA_CCW_LOCATE 0x43
  37 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
  38
  39 MODULE_LICENSE("GPL");
  40
  41 static struct dasd_discipline dasd_fba_discipline;
  42
  43 struct dasd_fba_private {
  44         struct dasd_fba_characteristics rdc_data;
  45 };
  46
  47 static struct ccw_device_id dasd_fba_ids[] = {
  48         { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
  49         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
  50         { /* end of list */ },
  51 };
  52
  53 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
  54
  55 static struct ccw_driver dasd_fba_driver; /* see below */
  56 static int
  57 dasd_fba_probe(struct ccw_device *cdev)
  58 {
  59         return dasd_generic_probe(cdev, &dasd_fba_discipline);
  60 }
  61
  62 static int
  63 dasd_fba_set_online(struct ccw_device *cdev)
  64 {
  65         return dasd_generic_set_online(cdev, &dasd_fba_discipline);
  66 }
  67
  68 static struct ccw_driver dasd_fba_driver = {
  69         .driver = {
  70                 .name   = "dasd-fba",
  71                 .owner  = THIS_MODULE,
  72         },
  73         .ids         = dasd_fba_ids,
  74         .probe       = dasd_fba_probe,
  75         .remove      = dasd_generic_remove,
  76         .set_offline = dasd_generic_set_offline,
  77         .set_online  = dasd_fba_set_online,
  78         .notify      = dasd_generic_notify,
  79         .path_event  = dasd_generic_path_event,
  80         .freeze      = dasd_generic_pm_freeze,
  81         .thaw        = dasd_generic_restore_device,
  82         .restore     = dasd_generic_restore_device,
  83         .int_class   = IRQIO_DAS,
  84 };
  85
  86 static void
  87 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
  88               int blksize, int beg, int nr)
  89 {
  90         ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
  91         ccw->flags = 0;
  92         ccw->count = 16;
  93         ccw->cda = (__u32) __pa(data);
  94         memset(data, 0, sizeof (struct DE_fba_data));
  95         if (rw == WRITE)
  96                 (data->mask).perm = 0x0;
  97         else if (rw == READ)
  98                 (data->mask).perm = 0x1;
  99         else
 100                 data->mask.perm = 0x2;
 101         data->blk_size = blksize;
 102         data->ext_loc = beg;
 103         data->ext_end = nr - 1;
 104 }
 105
 106 static void
 107 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
 108               int block_nr, int block_ct)
 109 {
 110         ccw->cmd_code = DASD_FBA_CCW_LOCATE;
 111         ccw->flags = 0;
 112         ccw->count = 8;
 113         ccw->cda = (__u32) __pa(data);
 114         memset(data, 0, sizeof (struct LO_fba_data));
 115         if (rw == WRITE)
 116                 data->operation.cmd = 0x5;
 117         else if (rw == READ)
 118                 data->operation.cmd = 0x6;
 119         else
 120                 data->operation.cmd = 0x8;
 121         data->blk_nr = block_nr;
 122         data->blk_ct = block_ct;
 123 }
 124
 125 static int
 126 dasd_fba_check_characteristics(struct dasd_device *device)
 127 {
 128         struct dasd_fba_private *private = device->private;
 129         struct ccw_device *cdev = device->cdev;
 130         struct dasd_block *block;
 131         int readonly, rc;
 132
 133         if (!private) {
 134                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
 135                 if (!private) {
 136                         dev_warn(&device->cdev->dev,
 137                                  "Allocating memory for private DASD "
 138                                  "data failed\n");
 139                         return -ENOMEM;
 140                 }
 141                 device->private = private;
 142         } else {
 143                 memset(private, 0, sizeof(*private));
 144         }
 145         block = dasd_alloc_block();
 146         if (IS_ERR(block)) {
 147                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
 148                                 "dasd block structure");
 149                 device->private = NULL;
 150                 kfree(private);
 151                 return PTR_ERR(block);
 152         }
 153         device->block = block;
 154         block->base = device;
 155
 156         /* Read Device Characteristics */
 157         rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
 158                                          &private->rdc_data, 32);
 159         if (rc) {
 160                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
 161                                 "characteristics returned error %d", rc);
 162                 device->block = NULL;
 163                 dasd_free_block(block);
 164                 device->private = NULL;
 165                 kfree(private);
 166                 return rc;
 167         }
 168
 169         device->default_expires = DASD_EXPIRES;
 170         device->default_retries = FBA_DEFAULT_RETRIES;
 171         dasd_path_set_opm(device, LPM_ANYPATH);
 172
 173         readonly = dasd_device_is_ro(device);
 174         if (readonly)
 175                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 176
 177         dev_info(&device->cdev->dev,
 178                  "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
 179                  "and %d B/blk%s\n",
 180                  cdev->id.dev_type,
 181                  cdev->id.dev_model,
 182                  cdev->id.cu_type,
 183                  cdev->id.cu_model,
 184                  ((private->rdc_data.blk_bdsa *
 185                    (private->rdc_data.blk_size >> 9)) >> 11),
 186                  private->rdc_data.blk_size,
 187                  readonly ? ", read-only device" : "");
 188         return 0;
 189 }
 190
 191 static int dasd_fba_do_analysis(struct dasd_block *block)
 192 {
 193         struct dasd_fba_private *private = block->base->private;
 194         int sb, rc;
 195
 196         rc = dasd_check_blocksize(private->rdc_data.blk_size);
 197         if (rc) {
 198                 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
 199                             private->rdc_data.blk_size);
 200                 return rc;
 201         }
 202         block->blocks = private->rdc_data.blk_bdsa;
 203         block->bp_block = private->rdc_data.blk_size;
 204         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 205         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 206                 block->s2b_shift++;
 207         return 0;
 208 }
 209
 210 static int dasd_fba_fill_geometry(struct dasd_block *block,
 211                                   struct hd_geometry *geo)
 212 {
 213         if (dasd_check_blocksize(block->bp_block) != 0)
 214                 return -EINVAL;
 215         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 216         geo->heads = 16;
 217         geo->sectors = 128 >> block->s2b_shift;
 218         return 0;
 219 }
 220
 221 static dasd_erp_fn_t
 222 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 223 {
 224         return dasd_default_erp_action;
 225 }
 226
 227 static dasd_erp_fn_t
 228 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 229 {
 230         if (cqr->function == dasd_default_erp_action)
 231                 return dasd_default_erp_postaction;
 232
 233         DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
 234                     cqr->function);
 235         return NULL;
 236 }
 237
 238 static void dasd_fba_check_for_device_change(struct dasd_device *device,
 239                                              struct dasd_ccw_req *cqr,
 240                                              struct irb *irb)
 241 {
 242         char mask;
 243
 244         /* first of all check for state change pending interrupt */
 245         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
 246         if ((irb->scsw.cmd.dstat & mask) == mask)
 247                 dasd_generic_handle_state_change(device);
 248 };
 249
 250 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
 251                                               struct dasd_block *block,
 252                                               struct request *req)
 253 {
 254         struct dasd_fba_private *private = block->base->private;
 255         unsigned long *idaws;
 256         struct LO_fba_data *LO_data;
 257         struct dasd_ccw_req *cqr;
 258         struct ccw1 *ccw;
 259         struct req_iterator iter;
 260         struct bio_vec bv;
 261         char *dst;
 262         int count, cidaw, cplength, datasize;
 263         sector_t recid, first_rec, last_rec;
 264         unsigned int blksize, off;
 265         unsigned char cmd;
 266
 267         if (rq_data_dir(req) == READ) {
 268                 cmd = DASD_FBA_CCW_READ;
 269         } else if (rq_data_dir(req) == WRITE) {
 270                 cmd = DASD_FBA_CCW_WRITE;
 271         } else
 272                 return ERR_PTR(-EINVAL);
 273         blksize = block->bp_block;
 274         /* Calculate record id of first and last block. */
 275         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 276         last_rec =
 277                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 278         /* Check struct bio and count the number of blocks for the request. */
 279         count = 0;
 280         cidaw = 0;
 281         rq_for_each_segment(bv, req, iter) {
 282                 if (bv.bv_len & (blksize - 1))
 283                         /* Fba can only do full blocks. */
 284                         return ERR_PTR(-EINVAL);
 285                 count += bv.bv_len >> (block->s2b_shift + 9);
 286                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
 287                         cidaw += bv.bv_len / blksize;
 288         }
 289         /* Paranoia. */
 290         if (count != last_rec - first_rec + 1)
 291                 return ERR_PTR(-EINVAL);
 292         /* 1x define extent + 1x locate record + number of blocks */
 293         cplength = 2 + count;
 294         /* 1x define extent + 1x locate record */
 295         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 296                 cidaw * sizeof(unsigned long);
 297         /*
 298          * Find out number of additional locate record ccws if the device
 299          * can't do data chaining.
 300          */
 301         if (private->rdc_data.mode.bits.data_chain == 0) {
 302                 cplength += count - 1;
 303                 datasize += (count - 1)*sizeof(struct LO_fba_data);
 304         }
 305         /* Allocate the ccw request. */
 306         cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
 307         if (IS_ERR(cqr))
 308                 return cqr;
 309         ccw = cqr->cpaddr;
 310         /* First ccw is define extent. */
 311         define_extent(ccw++, cqr->data, rq_data_dir(req),
 312                       block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
 313         /* Build locate_record + read/write ccws. */
 314         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
 315         LO_data = (struct LO_fba_data *) (idaws + cidaw);
 316         /* Locate record for all blocks for smart devices. */
 317         if (private->rdc_data.mode.bits.data_chain != 0) {
 318                 ccw[-1].flags |= CCW_FLAG_CC;
 319                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
 320         }
 321         recid = first_rec;
 322         rq_for_each_segment(bv, req, iter) {
 323                 dst = page_address(bv.bv_page) + bv.bv_offset;
 324                 if (dasd_page_cache) {
 325                         char *copy = kmem_cache_alloc(dasd_page_cache,
 326                                                       GFP_DMA | __GFP_NOWARN);
 327                         if (copy && rq_data_dir(req) == WRITE)
 328                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
 329                         if (copy)
 330                                 dst = copy + bv.bv_offset;
 331                 }
 332                 for (off = 0; off < bv.bv_len; off += blksize) {
 333                         /* Locate record for stupid devices. */
 334                         if (private->rdc_data.mode.bits.data_chain == 0) {
 335                                 ccw[-1].flags |= CCW_FLAG_CC;
 336                                 locate_record(ccw, LO_data++,
 337                                               rq_data_dir(req),
 338                                               recid - first_rec, 1);
 339                                 ccw->flags = CCW_FLAG_CC;
 340                                 ccw++;
 341                         } else {
 342                                 if (recid > first_rec)
 343                                         ccw[-1].flags |= CCW_FLAG_DC;
 344                                 else
 345                                         ccw[-1].flags |= CCW_FLAG_CC;
 346                         }
 347                         ccw->cmd_code = cmd;
 348                         ccw->count = block->bp_block;
 349                         if (idal_is_needed(dst, blksize)) {
 350                                 ccw->cda = (__u32)(addr_t) idaws;
 351                                 ccw->flags = CCW_FLAG_IDA;
 352                                 idaws = idal_create_words(idaws, dst, blksize);
 353                         } else {
 354                                 ccw->cda = (__u32)(addr_t) dst;
 355                                 ccw->flags = 0;
 356                         }
 357                         ccw++;
 358                         dst += blksize;
 359                         recid++;
 360                 }
 361         }
 362         if (blk_noretry_request(req) ||
 363             block->base->features & DASD_FEATURE_FAILFAST)
 364                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 365         cqr->startdev = memdev;
 366         cqr->memdev = memdev;
 367         cqr->block = block;
 368         cqr->expires = memdev->default_expires * HZ;    /* default 5 minutes */
 369         cqr->retries = memdev->default_retries;
 370         cqr->buildclk = get_tod_clock();
 371         cqr->status = DASD_CQR_FILLED;
 372         return cqr;
 373 }
 374
 375 static int
 376 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 377 {
 378         struct dasd_fba_private *private = cqr->block->base->private;
 379         struct ccw1 *ccw;
 380         struct req_iterator iter;
 381         struct bio_vec bv;
 382         char *dst, *cda;
 383         unsigned int blksize, off;
 384         int status;
 385
 386         if (!dasd_page_cache)
 387                 goto out;
 388         blksize = cqr->block->bp_block;
 389         ccw = cqr->cpaddr;
 390         /* Skip over define extent & locate record. */
 391         ccw++;
 392         if (private->rdc_data.mode.bits.data_chain != 0)
 393                 ccw++;
 394         rq_for_each_segment(bv, req, iter) {
 395                 dst = page_address(bv.bv_page) + bv.bv_offset;
 396                 for (off = 0; off < bv.bv_len; off += blksize) {
 397                         /* Skip locate record. */
 398                         if (private->rdc_data.mode.bits.data_chain == 0)
 399                                 ccw++;
 400                         if (dst) {
 401                                 if (ccw->flags & CCW_FLAG_IDA)
 402                                         cda = *((char **)((addr_t) ccw->cda));
 403                                 else
 404                                         cda = (char *)((addr_t) ccw->cda);
 405                                 if (dst != cda) {
 406                                         if (rq_data_dir(req) == READ)
 407                                                 memcpy(dst, cda, bv.bv_len);
 408                                         kmem_cache_free(dasd_page_cache,
 409                                             (void *)((addr_t)cda & PAGE_MASK));
 410                                 }
 411                                 dst = NULL;
 412                         }
 413                         ccw++;
 414                 }
 415         }
 416 out:
 417         status = cqr->status == DASD_CQR_DONE;
 418         dasd_sfree_request(cqr, cqr->memdev);
 419         return status;
 420 }
 421
 422 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
 423 {
 424         if (cqr->retries < 0)
 425                 cqr->status = DASD_CQR_FAILED;
 426         else
 427                 cqr->status = DASD_CQR_FILLED;
 428 };
 429
 430 static int
 431 dasd_fba_fill_info(struct dasd_device * device,
 432                    struct dasd_information2_t * info)
 433 {
 434         struct dasd_fba_private *private = device->private;
 435
 436         info->label_block = 1;
 437         info->FBA_layout = 1;
 438         info->format = DASD_FORMAT_LDL;
 439         info->characteristics_size = sizeof(private->rdc_data);
 440         memcpy(info->characteristics, &private->rdc_data,
 441                sizeof(private->rdc_data));
 442         info->confdata_size = 0;
 443         return 0;
 444 }
 445
 446 static void
 447 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
 448                         char *reason)
 449 {
 450         u64 *sense;
 451
 452         sense = (u64 *) dasd_get_sense(irb);
 453         if (sense) {
 454                 DBF_DEV_EVENT(DBF_EMERG, device,
 455                               "%s: %s %02x%02x%02x %016llx %016llx %016llx "
 456                               "%016llx", reason,
 457                               scsw_is_tm(&irb->scsw) ? "t" : "c",
 458                               scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
 459                               scsw_dstat(&irb->scsw), sense[0], sense[1],
 460                               sense[2], sense[3]);
 461         } else {
 462                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
 463                               "SORRY - NO VALID SENSE AVAILABLE\n");
 464         }
 465 }
 466
 467
 468 static void
 469 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 470                     struct irb *irb)
 471 {
 472         char *page;
 473         struct ccw1 *act, *end, *last;
 474         int len, sl, sct, count;
 475
 476         page = (char *) get_zeroed_page(GFP_ATOMIC);
 477         if (page == NULL) {
 478                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 479                             "No memory to dump sense data");
 480                 return;
 481         }
 482         len = sprintf(page, PRINTK_HEADER
 483                       " I/O status report for device %s:\n",
 484                       dev_name(&device->cdev->dev));
 485         len += sprintf(page + len, PRINTK_HEADER
 486                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 487                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 488         len += sprintf(page + len, PRINTK_HEADER
 489                        " device %s: Failing CCW: %p\n",
 490                        dev_name(&device->cdev->dev),
 491                        (void *) (addr_t) irb->scsw.cmd.cpa);
 492         if (irb->esw.esw0.erw.cons) {
 493                 for (sl = 0; sl < 4; sl++) {
 494                         len += sprintf(page + len, PRINTK_HEADER
 495                                        " Sense(hex) %2d-%2d:",
 496                                        (8 * sl), ((8 * sl) + 7));
 497
 498                         for (sct = 0; sct < 8; sct++) {
 499                                 len += sprintf(page + len, " %02x",
 500                                                irb->ecw[8 * sl + sct]);
 501                         }
 502                         len += sprintf(page + len, "\n");
 503                 }
 504         } else {
 505                 len += sprintf(page + len, PRINTK_HEADER
 506                                " SORRY - NO VALID SENSE AVAILABLE\n");
 507         }
 508         printk(KERN_ERR "%s", page);
 509
 510         /* dump the Channel Program */
 511         /* print first CCWs (maximum 8) */
 512         act = req->cpaddr;
 513         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 514         end = min(act + 8, last);
 515         len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
 516         while (act <= end) {
 517                 len += sprintf(page + len, PRINTK_HEADER
 518                                " CCW %p: %08X %08X DAT:",
 519                                act, ((int *) act)[0], ((int *) act)[1]);
 520                 for (count = 0; count < 32 && count < act->count;
 521                      count += sizeof(int))
 522                         len += sprintf(page + len, " %08X",
 523                                        ((int *) (addr_t) act->cda)
 524                                        [(count>>2)]);
 525                 len += sprintf(page + len, "\n");
 526                 act++;
 527         }
 528         printk(KERN_ERR "%s", page);
 529
 530
 531         /* print failing CCW area */
 532         len = 0;
 533         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
 534                 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
 535                 len += sprintf(page + len, PRINTK_HEADER "......\n");
 536         }
 537         end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
 538         while (act <= end) {
 539                 len += sprintf(page + len, PRINTK_HEADER
 540                                " CCW %p: %08X %08X DAT:",
 541                                act, ((int *) act)[0], ((int *) act)[1]);
 542                 for (count = 0; count < 32 && count < act->count;
 543                      count += sizeof(int))
 544                         len += sprintf(page + len, " %08X",
 545                                        ((int *) (addr_t) act->cda)
 546                                        [(count>>2)]);
 547                 len += sprintf(page + len, "\n");
 548                 act++;
 549         }
 550
 551         /* print last CCWs */
 552         if (act <  last - 2) {
 553                 act = last - 2;
 554                 len += sprintf(page + len, PRINTK_HEADER "......\n");
 555         }
 556         while (act <= last) {
 557                 len += sprintf(page + len, PRINTK_HEADER
 558                                " CCW %p: %08X %08X DAT:",
 559                                act, ((int *) act)[0], ((int *) act)[1]);
 560                 for (count = 0; count < 32 && count < act->count;
 561                      count += sizeof(int))
 562                         len += sprintf(page + len, " %08X",
 563                                        ((int *) (addr_t) act->cda)
 564                                        [(count>>2)]);
 565                 len += sprintf(page + len, "\n");
 566                 act++;
 567         }
 568         if (len > 0)
 569                 printk(KERN_ERR "%s", page);
 570         free_page((unsigned long) page);
 571 }
 572
 573 /*
 574  * max_blocks is dependent on the amount of storage that is available
 575  * in the static io buffer for each device. Currently each device has
 576  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 577  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 578  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 579  * addition we have one define extent ccw + 16 bytes of data and a
 580  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
 581  * That makes:
 582  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
 583  * We want to fit two into the available memory so that we can immediately
 584  * start the next request if one finishes off. That makes 100.1 blocks
 585  * for one request. Give a little safety and the result is 96.
 586  */
 587 static struct dasd_discipline dasd_fba_discipline = {
 588         .owner = THIS_MODULE,
 589         .name = "FBA ",
 590         .ebcname = "FBA ",
 591         .max_blocks = 96,
 592         .check_device = dasd_fba_check_characteristics,
 593         .do_analysis = dasd_fba_do_analysis,
 594         .verify_path = dasd_generic_verify_path,
 595         .fill_geometry = dasd_fba_fill_geometry,
 596         .start_IO = dasd_start_IO,
 597         .term_IO = dasd_term_IO,
 598         .handle_terminated_request = dasd_fba_handle_terminated_request,
 599         .erp_action = dasd_fba_erp_action,
 600         .erp_postaction = dasd_fba_erp_postaction,
 601         .check_for_device_change = dasd_fba_check_for_device_change,
 602         .build_cp = dasd_fba_build_cp,
 603         .free_cp = dasd_fba_free_cp,
 604         .dump_sense = dasd_fba_dump_sense,
 605         .dump_sense_dbf = dasd_fba_dump_sense_dbf,
 606         .fill_info = dasd_fba_fill_info,
 607 };
 608
 609 static int __init
 610 dasd_fba_init(void)
 611 {
 612         int ret;
 613
 614         ASCEBC(dasd_fba_discipline.ebcname, 4);
 615         ret = ccw_driver_register(&dasd_fba_driver);
 616         if (!ret)
 617                 wait_for_device_probe();
 618
 619         return ret;
 620 }
 621
 622 static void __exit
 623 dasd_fba_cleanup(void)
 624 {
 625         ccw_driver_unregister(&dasd_fba_driver);
 626 }
 627
 628 module_init(dasd_fba_init);
 629 module_exit(dasd_fba_cleanup);