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 #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/todclk.h>
  23 #include <asm/ccwdev.h>
  24
  25 #include "dasd_int.h"
  26 #include "dasd_fba.h"
  27
  28 #ifdef PRINTK_HEADER
  29 #undef PRINTK_HEADER
  30 #endif                          /* PRINTK_HEADER */
  31 #define PRINTK_HEADER "dasd(fba):"
  32
  33 #define DASD_FBA_CCW_WRITE 0x41
  34 #define DASD_FBA_CCW_READ 0x42
  35 #define DASD_FBA_CCW_LOCATE 0x43
  36 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
  37
  38 MODULE_LICENSE("GPL");
  39
  40 static struct dasd_discipline dasd_fba_discipline;
  41
  42 struct dasd_fba_private {
  43         struct dasd_fba_characteristics rdc_data;
  44 };
  45
  46 static struct ccw_device_id dasd_fba_ids[] = {
  47         { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
  48         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
  49         { /* end of list */ },
  50 };
  51
  52 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
  53
  54 static struct ccw_driver dasd_fba_driver; /* see below */
  55 static int
  56 dasd_fba_probe(struct ccw_device *cdev)
  57 {
  58         return dasd_generic_probe(cdev, &dasd_fba_discipline);
  59 }
  60
  61 static int
  62 dasd_fba_set_online(struct ccw_device *cdev)
  63 {
  64         return dasd_generic_set_online(cdev, &dasd_fba_discipline);
  65 }
  66
  67 static struct ccw_driver dasd_fba_driver = {
  68         .name        = "dasd-fba",
  69         .owner       = THIS_MODULE,
  70         .ids         = dasd_fba_ids,
  71         .probe       = dasd_fba_probe,
  72         .remove      = dasd_generic_remove,
  73         .set_offline = dasd_generic_set_offline,
  74         .set_online  = dasd_fba_set_online,
  75         .notify      = dasd_generic_notify,
  76 };
  77
  78 static void
  79 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
  80               int blksize, int beg, int nr)
  81 {
  82         ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
  83         ccw->flags = 0;
  84         ccw->count = 16;
  85         ccw->cda = (__u32) __pa(data);
  86         memset(data, 0, sizeof (struct DE_fba_data));
  87         if (rw == WRITE)
  88                 (data->mask).perm = 0x0;
  89         else if (rw == READ)
  90                 (data->mask).perm = 0x1;
  91         else
  92                 data->mask.perm = 0x2;
  93         data->blk_size = blksize;
  94         data->ext_loc = beg;
  95         data->ext_end = nr - 1;
  96 }
  97
  98 static void
  99 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
 100               int block_nr, int block_ct)
 101 {
 102         ccw->cmd_code = DASD_FBA_CCW_LOCATE;
 103         ccw->flags = 0;
 104         ccw->count = 8;
 105         ccw->cda = (__u32) __pa(data);
 106         memset(data, 0, sizeof (struct LO_fba_data));
 107         if (rw == WRITE)
 108                 data->operation.cmd = 0x5;
 109         else if (rw == READ)
 110                 data->operation.cmd = 0x6;
 111         else
 112                 data->operation.cmd = 0x8;
 113         data->blk_nr = block_nr;
 114         data->blk_ct = block_ct;
 115 }
 116
 117 static int
 118 dasd_fba_check_characteristics(struct dasd_device *device)
 119 {
 120         struct dasd_block *block;
 121         struct dasd_fba_private *private;
 122         struct ccw_device *cdev = device->cdev;
 123         void *rdc_data;
 124         int rc;
 125
 126         private = (struct dasd_fba_private *) device->private;
 127         if (private == NULL) {
 128                 private = kzalloc(sizeof(struct dasd_fba_private), GFP_KERNEL);
 129                 if (private == NULL) {
 130                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 131                                     "memory allocation failed for private "
 132                                     "data");
 133                         return -ENOMEM;
 134                 }
 135                 device->private = (void *) private;
 136         }
 137         block = dasd_alloc_block();
 138         if (IS_ERR(block)) {
 139                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 140                             "could not allocate dasd block structure");
 141                 kfree(device->private);
 142                 return PTR_ERR(block);
 143         }
 144         device->block = block;
 145         block->base = device;
 146
 147         /* Read Device Characteristics */
 148         rdc_data = (void *) &(private->rdc_data);
 149         rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
 150         if (rc) {
 151                 DEV_MESSAGE(KERN_WARNING, device,
 152                             "Read device characteristics returned error %d",
 153                             rc);
 154                 return rc;
 155         }
 156
 157         DEV_MESSAGE(KERN_INFO, device,
 158                     "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
 159                     cdev->id.dev_type,
 160                     cdev->id.dev_model,
 161                     cdev->id.cu_type,
 162                     cdev->id.cu_model,
 163                     ((private->rdc_data.blk_bdsa *
 164                       (private->rdc_data.blk_size >> 9)) >> 11),
 165                     private->rdc_data.blk_size);
 166         return 0;
 167 }
 168
 169 static int dasd_fba_do_analysis(struct dasd_block *block)
 170 {
 171         struct dasd_fba_private *private;
 172         int sb, rc;
 173
 174         private = (struct dasd_fba_private *) block->base->private;
 175         rc = dasd_check_blocksize(private->rdc_data.blk_size);
 176         if (rc) {
 177                 DEV_MESSAGE(KERN_INFO, block->base, "unknown blocksize %d",
 178                             private->rdc_data.blk_size);
 179                 return rc;
 180         }
 181         block->blocks = private->rdc_data.blk_bdsa;
 182         block->bp_block = private->rdc_data.blk_size;
 183         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 184         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 185                 block->s2b_shift++;
 186         return 0;
 187 }
 188
 189 static int dasd_fba_fill_geometry(struct dasd_block *block,
 190                                   struct hd_geometry *geo)
 191 {
 192         if (dasd_check_blocksize(block->bp_block) != 0)
 193                 return -EINVAL;
 194         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 195         geo->heads = 16;
 196         geo->sectors = 128 >> block->s2b_shift;
 197         return 0;
 198 }
 199
 200 static dasd_erp_fn_t
 201 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 202 {
 203         return dasd_default_erp_action;
 204 }
 205
 206 static dasd_erp_fn_t
 207 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 208 {
 209         if (cqr->function == dasd_default_erp_action)
 210                 return dasd_default_erp_postaction;
 211
 212         DEV_MESSAGE(KERN_WARNING, cqr->startdev, "unknown ERP action %p",
 213                     cqr->function);
 214         return NULL;
 215 }
 216
 217 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
 218                                                    struct irb *irb)
 219 {
 220         char mask;
 221
 222         /* first of all check for state change pending interrupt */
 223         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
 224         if ((irb->scsw.dstat & mask) == mask) {
 225                 dasd_generic_handle_state_change(device);
 226                 return;
 227         }
 228
 229         /* check for unsolicited interrupts */
 230         DEV_MESSAGE(KERN_DEBUG, device, "%s",
 231                     "unsolicited interrupt received");
 232         device->discipline->dump_sense(device, NULL, irb);
 233         dasd_schedule_device_bh(device);
 234         return;
 235 };
 236
 237 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
 238                                               struct dasd_block *block,
 239                                               struct request *req)
 240 {
 241         struct dasd_fba_private *private;
 242         unsigned long *idaws;
 243         struct LO_fba_data *LO_data;
 244         struct dasd_ccw_req *cqr;
 245         struct ccw1 *ccw;
 246         struct req_iterator iter;
 247         struct bio_vec *bv;
 248         char *dst;
 249         int count, cidaw, cplength, datasize;
 250         sector_t recid, first_rec, last_rec;
 251         unsigned int blksize, off;
 252         unsigned char cmd;
 253
 254         private = (struct dasd_fba_private *) block->base->private;
 255         if (rq_data_dir(req) == READ) {
 256                 cmd = DASD_FBA_CCW_READ;
 257         } else if (rq_data_dir(req) == WRITE) {
 258                 cmd = DASD_FBA_CCW_WRITE;
 259         } else
 260                 return ERR_PTR(-EINVAL);
 261         blksize = block->bp_block;
 262         /* Calculate record id of first and last block. */
 263         first_rec = req->sector >> block->s2b_shift;
 264         last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
 265         /* Check struct bio and count the number of blocks for the request. */
 266         count = 0;
 267         cidaw = 0;
 268         rq_for_each_segment(bv, req, iter) {
 269                 if (bv->bv_len & (blksize - 1))
 270                         /* Fba can only do full blocks. */
 271                         return ERR_PTR(-EINVAL);
 272                 count += bv->bv_len >> (block->s2b_shift + 9);
 273 #if defined(CONFIG_64BIT)
 274                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
 275                         cidaw += bv->bv_len / blksize;
 276 #endif
 277         }
 278         /* Paranoia. */
 279         if (count != last_rec - first_rec + 1)
 280                 return ERR_PTR(-EINVAL);
 281         /* 1x define extent + 1x locate record + number of blocks */
 282         cplength = 2 + count;
 283         /* 1x define extent + 1x locate record */
 284         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 285                 cidaw * sizeof(unsigned long);
 286         /*
 287          * Find out number of additional locate record ccws if the device
 288          * can't do data chaining.
 289          */
 290         if (private->rdc_data.mode.bits.data_chain == 0) {
 291                 cplength += count - 1;
 292                 datasize += (count - 1)*sizeof(struct LO_fba_data);
 293         }
 294         /* Allocate the ccw request. */
 295         cqr = dasd_smalloc_request(dasd_fba_discipline.name,
 296                                    cplength, datasize, memdev);
 297         if (IS_ERR(cqr))
 298                 return cqr;
 299         ccw = cqr->cpaddr;
 300         /* First ccw is define extent. */
 301         define_extent(ccw++, cqr->data, rq_data_dir(req),
 302                       block->bp_block, req->sector, req->nr_sectors);
 303         /* Build locate_record + read/write ccws. */
 304         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
 305         LO_data = (struct LO_fba_data *) (idaws + cidaw);
 306         /* Locate record for all blocks for smart devices. */
 307         if (private->rdc_data.mode.bits.data_chain != 0) {
 308                 ccw[-1].flags |= CCW_FLAG_CC;
 309                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
 310         }
 311         recid = first_rec;
 312         rq_for_each_segment(bv, req, iter) {
 313                 dst = page_address(bv->bv_page) + bv->bv_offset;
 314                 if (dasd_page_cache) {
 315                         char *copy = kmem_cache_alloc(dasd_page_cache,
 316                                                       GFP_DMA | __GFP_NOWARN);
 317                         if (copy && rq_data_dir(req) == WRITE)
 318                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
 319                         if (copy)
 320                                 dst = copy + bv->bv_offset;
 321                 }
 322                 for (off = 0; off < bv->bv_len; off += blksize) {
 323                         /* Locate record for stupid devices. */
 324                         if (private->rdc_data.mode.bits.data_chain == 0) {
 325                                 ccw[-1].flags |= CCW_FLAG_CC;
 326                                 locate_record(ccw, LO_data++,
 327                                               rq_data_dir(req),
 328                                               recid - first_rec, 1);
 329                                 ccw->flags = CCW_FLAG_CC;
 330                                 ccw++;
 331                         } else {
 332                                 if (recid > first_rec)
 333                                         ccw[-1].flags |= CCW_FLAG_DC;
 334                                 else
 335                                         ccw[-1].flags |= CCW_FLAG_CC;
 336                         }
 337                         ccw->cmd_code = cmd;
 338                         ccw->count = block->bp_block;
 339                         if (idal_is_needed(dst, blksize)) {
 340                                 ccw->cda = (__u32)(addr_t) idaws;
 341                                 ccw->flags = CCW_FLAG_IDA;
 342                                 idaws = idal_create_words(idaws, dst, blksize);
 343                         } else {
 344                                 ccw->cda = (__u32)(addr_t) dst;
 345                                 ccw->flags = 0;
 346                         }
 347                         ccw++;
 348                         dst += blksize;
 349                         recid++;
 350                 }
 351         }
 352         if (req->cmd_flags & REQ_FAILFAST)
 353                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 354         cqr->startdev = memdev;
 355         cqr->memdev = memdev;
 356         cqr->block = block;
 357         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
 358         cqr->retries = 32;
 359         cqr->buildclk = get_clock();
 360         cqr->status = DASD_CQR_FILLED;
 361         return cqr;
 362 }
 363
 364 static int
 365 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 366 {
 367         struct dasd_fba_private *private;
 368         struct ccw1 *ccw;
 369         struct req_iterator iter;
 370         struct bio_vec *bv;
 371         char *dst, *cda;
 372         unsigned int blksize, off;
 373         int status;
 374
 375         if (!dasd_page_cache)
 376                 goto out;
 377         private = (struct dasd_fba_private *) cqr->block->base->private;
 378         blksize = cqr->block->bp_block;
 379         ccw = cqr->cpaddr;
 380         /* Skip over define extent & locate record. */
 381         ccw++;
 382         if (private->rdc_data.mode.bits.data_chain != 0)
 383                 ccw++;
 384         rq_for_each_segment(bv, req, iter) {
 385                 dst = page_address(bv->bv_page) + bv->bv_offset;
 386                 for (off = 0; off < bv->bv_len; off += blksize) {
 387                         /* Skip locate record. */
 388                         if (private->rdc_data.mode.bits.data_chain == 0)
 389                                 ccw++;
 390                         if (dst) {
 391                                 if (ccw->flags & CCW_FLAG_IDA)
 392                                         cda = *((char **)((addr_t) ccw->cda));
 393                                 else
 394                                         cda = (char *)((addr_t) ccw->cda);
 395                                 if (dst != cda) {
 396                                         if (rq_data_dir(req) == READ)
 397                                                 memcpy(dst, cda, bv->bv_len);
 398                                         kmem_cache_free(dasd_page_cache,
 399                                             (void *)((addr_t)cda & PAGE_MASK));
 400                                 }
 401                                 dst = NULL;
 402                         }
 403                         ccw++;
 404                 }
 405         }
 406 out:
 407         status = cqr->status == DASD_CQR_DONE;
 408         dasd_sfree_request(cqr, cqr->memdev);
 409         return status;
 410 }
 411
 412 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
 413 {
 414         cqr->status = DASD_CQR_FILLED;
 415 };
 416
 417 static int
 418 dasd_fba_fill_info(struct dasd_device * device,
 419                    struct dasd_information2_t * info)
 420 {
 421         info->label_block = 1;
 422         info->FBA_layout = 1;
 423         info->format = DASD_FORMAT_LDL;
 424         info->characteristics_size = sizeof(struct dasd_fba_characteristics);
 425         memcpy(info->characteristics,
 426                &((struct dasd_fba_private *) device->private)->rdc_data,
 427                sizeof (struct dasd_fba_characteristics));
 428         info->confdata_size = 0;
 429         return 0;
 430 }
 431
 432 static void
 433 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 434                     struct irb *irb)
 435 {
 436         char *page;
 437         struct ccw1 *act, *end, *last;
 438         int len, sl, sct, count;
 439
 440         page = (char *) get_zeroed_page(GFP_ATOMIC);
 441         if (page == NULL) {
 442                 DEV_MESSAGE(KERN_ERR, device, " %s",
 443                             "No memory to dump sense data");
 444                 return;
 445         }
 446         len = sprintf(page, KERN_ERR PRINTK_HEADER
 447                       " I/O status report for device %s:\n",
 448                       device->cdev->dev.bus_id);
 449         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 450                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 451                        irb->scsw.cstat, irb->scsw.dstat);
 452         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 453                        " device %s: Failing CCW: %p\n",
 454                        device->cdev->dev.bus_id,
 455                        (void *) (addr_t) irb->scsw.cpa);
 456         if (irb->esw.esw0.erw.cons) {
 457                 for (sl = 0; sl < 4; sl++) {
 458                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 459                                        " Sense(hex) %2d-%2d:",
 460                                        (8 * sl), ((8 * sl) + 7));
 461
 462                         for (sct = 0; sct < 8; sct++) {
 463                                 len += sprintf(page + len, " %02x",
 464                                                irb->ecw[8 * sl + sct]);
 465                         }
 466                         len += sprintf(page + len, "\n");
 467                 }
 468         } else {
 469                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 470                                " SORRY - NO VALID SENSE AVAILABLE\n");
 471         }
 472         MESSAGE_LOG(KERN_ERR, "%s",
 473                     page + sizeof(KERN_ERR PRINTK_HEADER));
 474
 475         /* dump the Channel Program */
 476         /* print first CCWs (maximum 8) */
 477         act = req->cpaddr;
 478         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 479         end = min(act + 8, last);
 480         len = sprintf(page, KERN_ERR PRINTK_HEADER
 481                       " Related CP in req: %p\n", req);
 482         while (act <= end) {
 483                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 484                                " CCW %p: %08X %08X DAT:",
 485                                act, ((int *) act)[0], ((int *) act)[1]);
 486                 for (count = 0; count < 32 && count < act->count;
 487                      count += sizeof(int))
 488                         len += sprintf(page + len, " %08X",
 489                                        ((int *) (addr_t) act->cda)
 490                                        [(count>>2)]);
 491                 len += sprintf(page + len, "\n");
 492                 act++;
 493         }
 494         MESSAGE_LOG(KERN_ERR, "%s",
 495                     page + sizeof(KERN_ERR PRINTK_HEADER));
 496
 497
 498         /* print failing CCW area */
 499         len = 0;
 500         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
 501                 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
 502                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 503         }
 504         end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
 505         while (act <= end) {
 506                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 507                                " CCW %p: %08X %08X DAT:",
 508                                act, ((int *) act)[0], ((int *) act)[1]);
 509                 for (count = 0; count < 32 && count < act->count;
 510                      count += sizeof(int))
 511                         len += sprintf(page + len, " %08X",
 512                                        ((int *) (addr_t) act->cda)
 513                                        [(count>>2)]);
 514                 len += sprintf(page + len, "\n");
 515                 act++;
 516         }
 517
 518         /* print last CCWs */
 519         if (act <  last - 2) {
 520                 act = last - 2;
 521                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 522         }
 523         while (act <= last) {
 524                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 525                                " CCW %p: %08X %08X DAT:",
 526                                act, ((int *) act)[0], ((int *) act)[1]);
 527                 for (count = 0; count < 32 && count < act->count;
 528                      count += sizeof(int))
 529                         len += sprintf(page + len, " %08X",
 530                                        ((int *) (addr_t) act->cda)
 531                                        [(count>>2)]);
 532                 len += sprintf(page + len, "\n");
 533                 act++;
 534         }
 535         if (len > 0)
 536                 MESSAGE_LOG(KERN_ERR, "%s",
 537                             page + sizeof(KERN_ERR PRINTK_HEADER));
 538         free_page((unsigned long) page);
 539 }
 540
 541 /*
 542  * max_blocks is dependent on the amount of storage that is available
 543  * in the static io buffer for each device. Currently each device has
 544  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 545  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 546  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 547  * addition we have one define extent ccw + 16 bytes of data and a
 548  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
 549  * That makes:
 550  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
 551  * We want to fit two into the available memory so that we can immediately
 552  * start the next request if one finishes off. That makes 100.1 blocks
 553  * for one request. Give a little safety and the result is 96.
 554  */
 555 static struct dasd_discipline dasd_fba_discipline = {
 556         .owner = THIS_MODULE,
 557         .name = "FBA ",
 558         .ebcname = "FBA ",
 559         .max_blocks = 96,
 560         .check_device = dasd_fba_check_characteristics,
 561         .do_analysis = dasd_fba_do_analysis,
 562         .fill_geometry = dasd_fba_fill_geometry,
 563         .start_IO = dasd_start_IO,
 564         .term_IO = dasd_term_IO,
 565         .handle_terminated_request = dasd_fba_handle_terminated_request,
 566         .erp_action = dasd_fba_erp_action,
 567         .erp_postaction = dasd_fba_erp_postaction,
 568         .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
 569         .build_cp = dasd_fba_build_cp,
 570         .free_cp = dasd_fba_free_cp,
 571         .dump_sense = dasd_fba_dump_sense,
 572         .fill_info = dasd_fba_fill_info,
 573 };
 574
 575 static int __init
 576 dasd_fba_init(void)
 577 {
 578         ASCEBC(dasd_fba_discipline.ebcname, 4);
 579         return ccw_driver_register(&dasd_fba_driver);
 580 }
 581
 582 static void __exit
 583 dasd_fba_cleanup(void)
 584 {
 585         ccw_driver_unregister(&dasd_fba_driver);
 586 }
 587
 588 module_init(dasd_fba_init);
 589 module_exit(dasd_fba_cleanup);