git.oblomov.eu Git - linux-2.6/blob - drivers/s390/block/dasd_fba.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_fba.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Bugreports.to..: <Linux390@de.ibm.com>
   5  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   6  *
   7  */
   8
   9 #define KMSG_COMPONENT "dasd"
  10
  11 #include <linux/stddef.h>
  12 #include <linux/kernel.h>
  13 #include <asm/debug.h>
  14
  15 #include <linux/slab.h>
  16 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  17 #include <linux/bio.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20
  21 #include <asm/idals.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/io.h>
  24 #include <asm/todclk.h>
  25 #include <asm/ccwdev.h>
  26
  27 #include "dasd_int.h"
  28 #include "dasd_fba.h"
  29
  30 #ifdef PRINTK_HEADER
  31 #undef PRINTK_HEADER
  32 #endif                          /* PRINTK_HEADER */
  33 #define PRINTK_HEADER "dasd(fba):"
  34
  35 #define DASD_FBA_CCW_WRITE 0x41
  36 #define DASD_FBA_CCW_READ 0x42
  37 #define DASD_FBA_CCW_LOCATE 0x43
  38 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
  39
  40 MODULE_LICENSE("GPL");
  41
  42 static struct dasd_discipline dasd_fba_discipline;
  43
  44 struct dasd_fba_private {
  45         struct dasd_fba_characteristics rdc_data;
  46 };
  47
  48 static struct ccw_device_id dasd_fba_ids[] = {
  49         { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
  50         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
  51         { /* end of list */ },
  52 };
  53
  54 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
  55
  56 static struct ccw_driver dasd_fba_driver; /* see below */
  57 static int
  58 dasd_fba_probe(struct ccw_device *cdev)
  59 {
  60         return dasd_generic_probe(cdev, &dasd_fba_discipline);
  61 }
  62
  63 static int
  64 dasd_fba_set_online(struct ccw_device *cdev)
  65 {
  66         return dasd_generic_set_online(cdev, &dasd_fba_discipline);
  67 }
  68
  69 static struct ccw_driver dasd_fba_driver = {
  70         .name        = "dasd-fba",
  71         .owner       = THIS_MODULE,
  72         .ids         = dasd_fba_ids,
  73         .probe       = dasd_fba_probe,
  74         .remove      = dasd_generic_remove,
  75         .set_offline = dasd_generic_set_offline,
  76         .set_online  = dasd_fba_set_online,
  77         .notify      = dasd_generic_notify,
  78 };
  79
  80 static void
  81 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
  82               int blksize, int beg, int nr)
  83 {
  84         ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
  85         ccw->flags = 0;
  86         ccw->count = 16;
  87         ccw->cda = (__u32) __pa(data);
  88         memset(data, 0, sizeof (struct DE_fba_data));
  89         if (rw == WRITE)
  90                 (data->mask).perm = 0x0;
  91         else if (rw == READ)
  92                 (data->mask).perm = 0x1;
  93         else
  94                 data->mask.perm = 0x2;
  95         data->blk_size = blksize;
  96         data->ext_loc = beg;
  97         data->ext_end = nr - 1;
  98 }
  99
 100 static void
 101 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
 102               int block_nr, int block_ct)
 103 {
 104         ccw->cmd_code = DASD_FBA_CCW_LOCATE;
 105         ccw->flags = 0;
 106         ccw->count = 8;
 107         ccw->cda = (__u32) __pa(data);
 108         memset(data, 0, sizeof (struct LO_fba_data));
 109         if (rw == WRITE)
 110                 data->operation.cmd = 0x5;
 111         else if (rw == READ)
 112                 data->operation.cmd = 0x6;
 113         else
 114                 data->operation.cmd = 0x8;
 115         data->blk_nr = block_nr;
 116         data->blk_ct = block_ct;
 117 }
 118
 119 static int
 120 dasd_fba_check_characteristics(struct dasd_device *device)
 121 {
 122         struct dasd_block *block;
 123         struct dasd_fba_private *private;
 124         struct ccw_device *cdev = device->cdev;
 125         void *rdc_data;
 126         int rc;
 127
 128         private = (struct dasd_fba_private *) device->private;
 129         if (private == NULL) {
 130                 private = kzalloc(sizeof(struct dasd_fba_private),
 131                                   GFP_KERNEL | GFP_DMA);
 132                 if (private == NULL) {
 133                         dev_warn(&device->cdev->dev,
 134                                  "Allocating memory for private DASD "
 135                                  "data failed\n");
 136                         return -ENOMEM;
 137                 }
 138                 device->private = (void *) private;
 139         }
 140         block = dasd_alloc_block();
 141         if (IS_ERR(block)) {
 142                 DBF_EVENT(DBF_WARNING, "could not allocate dasd block "
 143                           "structure for device: %s",
 144                           dev_name(&device->cdev->dev));
 145                 device->private = NULL;
 146                 kfree(private);
 147                 return PTR_ERR(block);
 148         }
 149         device->block = block;
 150         block->base = device;
 151
 152         /* Read Device Characteristics */
 153         rdc_data = (void *) &(private->rdc_data);
 154         rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
 155         if (rc) {
 156                 DBF_EVENT(DBF_WARNING, "Read device characteristics returned "
 157                           "error %d for device: %s",
 158                           rc, dev_name(&device->cdev->dev));
 159                 device->block = NULL;
 160                 dasd_free_block(block);
 161                 device->private = NULL;
 162                 kfree(private);
 163                 return rc;
 164         }
 165
 166         dev_info(&device->cdev->dev,
 167                  "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
 168                  "and %d B/blk\n",
 169                  cdev->id.dev_type,
 170                  cdev->id.dev_model,
 171                  cdev->id.cu_type,
 172                  cdev->id.cu_model,
 173                  ((private->rdc_data.blk_bdsa *
 174                    (private->rdc_data.blk_size >> 9)) >> 11),
 175                  private->rdc_data.blk_size);
 176         return 0;
 177 }
 178
 179 static int dasd_fba_do_analysis(struct dasd_block *block)
 180 {
 181         struct dasd_fba_private *private;
 182         int sb, rc;
 183
 184         private = (struct dasd_fba_private *) block->base->private;
 185         rc = dasd_check_blocksize(private->rdc_data.blk_size);
 186         if (rc) {
 187                 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
 188                             private->rdc_data.blk_size);
 189                 return rc;
 190         }
 191         block->blocks = private->rdc_data.blk_bdsa;
 192         block->bp_block = private->rdc_data.blk_size;
 193         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 194         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 195                 block->s2b_shift++;
 196         return 0;
 197 }
 198
 199 static int dasd_fba_fill_geometry(struct dasd_block *block,
 200                                   struct hd_geometry *geo)
 201 {
 202         if (dasd_check_blocksize(block->bp_block) != 0)
 203                 return -EINVAL;
 204         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 205         geo->heads = 16;
 206         geo->sectors = 128 >> block->s2b_shift;
 207         return 0;
 208 }
 209
 210 static dasd_erp_fn_t
 211 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 212 {
 213         return dasd_default_erp_action;
 214 }
 215
 216 static dasd_erp_fn_t
 217 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 218 {
 219         if (cqr->function == dasd_default_erp_action)
 220                 return dasd_default_erp_postaction;
 221
 222         DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
 223                     cqr->function);
 224         return NULL;
 225 }
 226
 227 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
 228                                                    struct irb *irb)
 229 {
 230         char mask;
 231
 232         /* first of all check for state change pending interrupt */
 233         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
 234         if ((irb->scsw.cmd.dstat & mask) == mask) {
 235                 dasd_generic_handle_state_change(device);
 236                 return;
 237         }
 238
 239         /* check for unsolicited interrupts */
 240         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 241                     "unsolicited interrupt received");
 242         device->discipline->dump_sense_dbf(device, NULL, irb, "unsolicited");
 243         dasd_schedule_device_bh(device);
 244         return;
 245 };
 246
 247 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
 248                                               struct dasd_block *block,
 249                                               struct request *req)
 250 {
 251         struct dasd_fba_private *private;
 252         unsigned long *idaws;
 253         struct LO_fba_data *LO_data;
 254         struct dasd_ccw_req *cqr;
 255         struct ccw1 *ccw;
 256         struct req_iterator iter;
 257         struct bio_vec *bv;
 258         char *dst;
 259         int count, cidaw, cplength, datasize;
 260         sector_t recid, first_rec, last_rec;
 261         unsigned int blksize, off;
 262         unsigned char cmd;
 263
 264         private = (struct dasd_fba_private *) block->base->private;
 265         if (rq_data_dir(req) == READ) {
 266                 cmd = DASD_FBA_CCW_READ;
 267         } else if (rq_data_dir(req) == WRITE) {
 268                 cmd = DASD_FBA_CCW_WRITE;
 269         } else
 270                 return ERR_PTR(-EINVAL);
 271         blksize = block->bp_block;
 272         /* Calculate record id of first and last block. */
 273         first_rec = req->sector >> block->s2b_shift;
 274         last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
 275         /* Check struct bio and count the number of blocks for the request. */
 276         count = 0;
 277         cidaw = 0;
 278         rq_for_each_segment(bv, req, iter) {
 279                 if (bv->bv_len & (blksize - 1))
 280                         /* Fba can only do full blocks. */
 281                         return ERR_PTR(-EINVAL);
 282                 count += bv->bv_len >> (block->s2b_shift + 9);
 283 #if defined(CONFIG_64BIT)
 284                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
 285                         cidaw += bv->bv_len / blksize;
 286 #endif
 287         }
 288         /* Paranoia. */
 289         if (count != last_rec - first_rec + 1)
 290                 return ERR_PTR(-EINVAL);
 291         /* 1x define extent + 1x locate record + number of blocks */
 292         cplength = 2 + count;
 293         /* 1x define extent + 1x locate record */
 294         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 295                 cidaw * sizeof(unsigned long);
 296         /*
 297          * Find out number of additional locate record ccws if the device
 298          * can't do data chaining.
 299          */
 300         if (private->rdc_data.mode.bits.data_chain == 0) {
 301                 cplength += count - 1;
 302                 datasize += (count - 1)*sizeof(struct LO_fba_data);
 303         }
 304         /* Allocate the ccw request. */
 305         cqr = dasd_smalloc_request(dasd_fba_discipline.name,
 306                                    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, req->sector, req->nr_sectors);
 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 = 5 * 60 * HZ;     /* 5 minutes */
 369         cqr->retries = 32;
 370         cqr->buildclk = get_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;
 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         private = (struct dasd_fba_private *) cqr->block->base->private;
 389         blksize = cqr->block->bp_block;
 390         ccw = cqr->cpaddr;
 391         /* Skip over define extent & locate record. */
 392         ccw++;
 393         if (private->rdc_data.mode.bits.data_chain != 0)
 394                 ccw++;
 395         rq_for_each_segment(bv, req, iter) {
 396                 dst = page_address(bv->bv_page) + bv->bv_offset;
 397                 for (off = 0; off < bv->bv_len; off += blksize) {
 398                         /* Skip locate record. */
 399                         if (private->rdc_data.mode.bits.data_chain == 0)
 400                                 ccw++;
 401                         if (dst) {
 402                                 if (ccw->flags & CCW_FLAG_IDA)
 403                                         cda = *((char **)((addr_t) ccw->cda));
 404                                 else
 405                                         cda = (char *)((addr_t) ccw->cda);
 406                                 if (dst != cda) {
 407                                         if (rq_data_dir(req) == READ)
 408                                                 memcpy(dst, cda, bv->bv_len);
 409                                         kmem_cache_free(dasd_page_cache,
 410                                             (void *)((addr_t)cda & PAGE_MASK));
 411                                 }
 412                                 dst = NULL;
 413                         }
 414                         ccw++;
 415                 }
 416         }
 417 out:
 418         status = cqr->status == DASD_CQR_DONE;
 419         dasd_sfree_request(cqr, cqr->memdev);
 420         return status;
 421 }
 422
 423 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
 424 {
 425         cqr->status = DASD_CQR_FILLED;
 426 };
 427
 428 static int
 429 dasd_fba_fill_info(struct dasd_device * device,
 430                    struct dasd_information2_t * info)
 431 {
 432         info->label_block = 1;
 433         info->FBA_layout = 1;
 434         info->format = DASD_FORMAT_LDL;
 435         info->characteristics_size = sizeof(struct dasd_fba_characteristics);
 436         memcpy(info->characteristics,
 437                &((struct dasd_fba_private *) device->private)->rdc_data,
 438                sizeof (struct dasd_fba_characteristics));
 439         info->confdata_size = 0;
 440         return 0;
 441 }
 442
 443 static void
 444 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct dasd_ccw_req *req,
 445                          struct irb *irb, char *reason)
 446 {
 447         int sl;
 448         if (irb->esw.esw0.erw.cons) {
 449                 for (sl = 0; sl < 4; sl++) {
 450                         DBF_DEV_EVENT(DBF_EMERG, device,
 451                                       "%s: %08x %08x %08x %08x",
 452                                       reason, irb->ecw[8 * 0], irb->ecw[8 * 1],
 453                                       irb->ecw[8 * 2], irb->ecw[8 * 3]);
 454                 }
 455         } else {
 456                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
 457                               "SORRY - NO VALID SENSE AVAILABLE\n");
 458         }
 459 }
 460
 461
 462 static void
 463 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 464                     struct irb *irb)
 465 {
 466         char *page;
 467         struct ccw1 *act, *end, *last;
 468         int len, sl, sct, count;
 469
 470         page = (char *) get_zeroed_page(GFP_ATOMIC);
 471         if (page == NULL) {
 472                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 473                             "No memory to dump sense data");
 474                 return;
 475         }
 476         len = sprintf(page, KERN_ERR PRINTK_HEADER
 477                       " I/O status report for device %s:\n",
 478                       dev_name(&device->cdev->dev));
 479         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 480                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 481                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 482         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 483                        " device %s: Failing CCW: %p\n",
 484                        dev_name(&device->cdev->dev),
 485                        (void *) (addr_t) irb->scsw.cmd.cpa);
 486         if (irb->esw.esw0.erw.cons) {
 487                 for (sl = 0; sl < 4; sl++) {
 488                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 489                                        " Sense(hex) %2d-%2d:",
 490                                        (8 * sl), ((8 * sl) + 7));
 491
 492                         for (sct = 0; sct < 8; sct++) {
 493                                 len += sprintf(page + len, " %02x",
 494                                                irb->ecw[8 * sl + sct]);
 495                         }
 496                         len += sprintf(page + len, "\n");
 497                 }
 498         } else {
 499                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 500                                " SORRY - NO VALID SENSE AVAILABLE\n");
 501         }
 502         printk(KERN_ERR "%s", page);
 503
 504         /* dump the Channel Program */
 505         /* print first CCWs (maximum 8) */
 506         act = req->cpaddr;
 507         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 508         end = min(act + 8, last);
 509         len = sprintf(page, KERN_ERR PRINTK_HEADER
 510                       " Related CP in req: %p\n", req);
 511         while (act <= end) {
 512                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 513                                " CCW %p: %08X %08X DAT:",
 514                                act, ((int *) act)[0], ((int *) act)[1]);
 515                 for (count = 0; count < 32 && count < act->count;
 516                      count += sizeof(int))
 517                         len += sprintf(page + len, " %08X",
 518                                        ((int *) (addr_t) act->cda)
 519                                        [(count>>2)]);
 520                 len += sprintf(page + len, "\n");
 521                 act++;
 522         }
 523         printk(KERN_ERR "%s", page);
 524
 525
 526         /* print failing CCW area */
 527         len = 0;
 528         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
 529                 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
 530                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 531         }
 532         end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
 533         while (act <= end) {
 534                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 535                                " CCW %p: %08X %08X DAT:",
 536                                act, ((int *) act)[0], ((int *) act)[1]);
 537                 for (count = 0; count < 32 && count < act->count;
 538                      count += sizeof(int))
 539                         len += sprintf(page + len, " %08X",
 540                                        ((int *) (addr_t) act->cda)
 541                                        [(count>>2)]);
 542                 len += sprintf(page + len, "\n");
 543                 act++;
 544         }
 545
 546         /* print last CCWs */
 547         if (act <  last - 2) {
 548                 act = last - 2;
 549                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 550         }
 551         while (act <= last) {
 552                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 553                                " CCW %p: %08X %08X DAT:",
 554                                act, ((int *) act)[0], ((int *) act)[1]);
 555                 for (count = 0; count < 32 && count < act->count;
 556                      count += sizeof(int))
 557                         len += sprintf(page + len, " %08X",
 558                                        ((int *) (addr_t) act->cda)
 559                                        [(count>>2)]);
 560                 len += sprintf(page + len, "\n");
 561                 act++;
 562         }
 563         if (len > 0)
 564                 printk(KERN_ERR "%s", page);
 565         free_page((unsigned long) page);
 566 }
 567
 568 /*
 569  * max_blocks is dependent on the amount of storage that is available
 570  * in the static io buffer for each device. Currently each device has
 571  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 572  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 573  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 574  * addition we have one define extent ccw + 16 bytes of data and a
 575  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
 576  * That makes:
 577  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
 578  * We want to fit two into the available memory so that we can immediately
 579  * start the next request if one finishes off. That makes 100.1 blocks
 580  * for one request. Give a little safety and the result is 96.
 581  */
 582 static struct dasd_discipline dasd_fba_discipline = {
 583         .owner = THIS_MODULE,
 584         .name = "FBA ",
 585         .ebcname = "FBA ",
 586         .max_blocks = 96,
 587         .check_device = dasd_fba_check_characteristics,
 588         .do_analysis = dasd_fba_do_analysis,
 589         .fill_geometry = dasd_fba_fill_geometry,
 590         .start_IO = dasd_start_IO,
 591         .term_IO = dasd_term_IO,
 592         .handle_terminated_request = dasd_fba_handle_terminated_request,
 593         .erp_action = dasd_fba_erp_action,
 594         .erp_postaction = dasd_fba_erp_postaction,
 595         .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
 596         .build_cp = dasd_fba_build_cp,
 597         .free_cp = dasd_fba_free_cp,
 598         .dump_sense = dasd_fba_dump_sense,
 599         .dump_sense_dbf = dasd_fba_dump_sense_dbf,
 600         .fill_info = dasd_fba_fill_info,
 601 };
 602
 603 static int __init
 604 dasd_fba_init(void)
 605 {
 606         ASCEBC(dasd_fba_discipline.ebcname, 4);
 607         return ccw_driver_register(&dasd_fba_driver);
 608 }
 609
 610 static void __exit
 611 dasd_fba_cleanup(void)
 612 {
 613         ccw_driver_unregister(&dasd_fba_driver);
 614 }
 615
 616 module_init(dasd_fba_init);
 617 module_exit(dasd_fba_cleanup);