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         /* FBA supports discard, set the according feature bit */
 178         dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
 179
 180         dev_info(&device->cdev->dev,
 181                  "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
 182                  "and %d B/blk%s\n",
 183                  cdev->id.dev_type,
 184                  cdev->id.dev_model,
 185                  cdev->id.cu_type,
 186                  cdev->id.cu_model,
 187                  ((private->rdc_data.blk_bdsa *
 188                    (private->rdc_data.blk_size >> 9)) >> 11),
 189                  private->rdc_data.blk_size,
 190                  readonly ? ", read-only device" : "");
 191         return 0;
 192 }
 193
 194 static int dasd_fba_do_analysis(struct dasd_block *block)
 195 {
 196         struct dasd_fba_private *private = block->base->private;
 197         int sb, rc;
 198
 199         rc = dasd_check_blocksize(private->rdc_data.blk_size);
 200         if (rc) {
 201                 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
 202                             private->rdc_data.blk_size);
 203                 return rc;
 204         }
 205         block->blocks = private->rdc_data.blk_bdsa;
 206         block->bp_block = private->rdc_data.blk_size;
 207         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 208         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 209                 block->s2b_shift++;
 210         return 0;
 211 }
 212
 213 static int dasd_fba_fill_geometry(struct dasd_block *block,
 214                                   struct hd_geometry *geo)
 215 {
 216         if (dasd_check_blocksize(block->bp_block) != 0)
 217                 return -EINVAL;
 218         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 219         geo->heads = 16;
 220         geo->sectors = 128 >> block->s2b_shift;
 221         return 0;
 222 }
 223
 224 static dasd_erp_fn_t
 225 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 226 {
 227         return dasd_default_erp_action;
 228 }
 229
 230 static dasd_erp_fn_t
 231 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 232 {
 233         if (cqr->function == dasd_default_erp_action)
 234                 return dasd_default_erp_postaction;
 235
 236         DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
 237                     cqr->function);
 238         return NULL;
 239 }
 240
 241 static void dasd_fba_check_for_device_change(struct dasd_device *device,
 242                                              struct dasd_ccw_req *cqr,
 243                                              struct irb *irb)
 244 {
 245         char mask;
 246
 247         /* first of all check for state change pending interrupt */
 248         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
 249         if ((irb->scsw.cmd.dstat & mask) == mask)
 250                 dasd_generic_handle_state_change(device);
 251 };
 252
 253
 254 /*
 255  * Builds a CCW with no data payload
 256  */
 257 static void ccw_write_no_data(struct ccw1 *ccw)
 258 {
 259         ccw->cmd_code = DASD_FBA_CCW_WRITE;
 260         ccw->flags |= CCW_FLAG_SLI;
 261         ccw->count = 0;
 262 }
 263
 264 /*
 265  * Builds a CCW that writes only zeroes.
 266  */
 267 static void ccw_write_zero(struct ccw1 *ccw, int count)
 268 {
 269         ccw->cmd_code = DASD_FBA_CCW_WRITE;
 270         ccw->flags |= CCW_FLAG_SLI;
 271         ccw->count = count;
 272         ccw->cda = (__u32) (addr_t) page_to_phys(ZERO_PAGE(0));
 273 }
 274
 275 /*
 276  * Helper function to count the amount of necessary CCWs within a given range
 277  * with 4k alignment and command chaining in mind.
 278  */
 279 static int count_ccws(sector_t first_rec, sector_t last_rec,
 280                       unsigned int blocks_per_page)
 281 {
 282         sector_t wz_stop = 0, d_stop = 0;
 283         int cur_pos = 0;
 284         int count = 0;
 285
 286         if (first_rec % blocks_per_page != 0) {
 287                 wz_stop = first_rec + blocks_per_page -
 288                         (first_rec % blocks_per_page) - 1;
 289                 if (wz_stop > last_rec)
 290                         wz_stop = last_rec;
 291                 cur_pos = wz_stop - first_rec + 1;
 292                 count++;
 293         }
 294
 295         if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
 296                 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
 297                         d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
 298                                              blocks_per_page);
 299                 else
 300                         d_stop = last_rec;
 301
 302                 cur_pos += d_stop - (first_rec + cur_pos) + 1;
 303                 count++;
 304         }
 305
 306         if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
 307                 count++;
 308
 309         return count;
 310 }
 311
 312 /*
 313  * This function builds a CCW request for block layer discard requests.
 314  * Each page in the z/VM hypervisor that represents certain records of an FBA
 315  * device will be padded with zeros. This is a special behaviour of the WRITE
 316  * command which is triggered when no data payload is added to the CCW.
 317  *
 318  * Note: Due to issues in some z/VM versions, we can't fully utilise this
 319  * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
 320  * work around those issues and write actual zeroes to the unaligned parts in
 321  * the request. This workaround might be removed in the future.
 322  */
 323 static struct dasd_ccw_req *dasd_fba_build_cp_discard(
 324                                                 struct dasd_device *memdev,
 325                                                 struct dasd_block *block,
 326                                                 struct request *req)
 327 {
 328         struct LO_fba_data *LO_data;
 329         struct dasd_ccw_req *cqr;
 330         struct ccw1 *ccw;
 331
 332         sector_t wz_stop = 0, d_stop = 0;
 333         sector_t first_rec, last_rec;
 334
 335         unsigned int blksize = block->bp_block;
 336         unsigned int blocks_per_page;
 337         int wz_count = 0;
 338         int d_count = 0;
 339         int cur_pos = 0; /* Current position within the extent */
 340         int count = 0;
 341         int cplength;
 342         int datasize;
 343         int nr_ccws;
 344
 345         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 346         last_rec =
 347                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 348         count = last_rec - first_rec + 1;
 349
 350         blocks_per_page = BLOCKS_PER_PAGE(blksize);
 351         nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
 352
 353         /* define extent + nr_ccws * locate record + nr_ccws * single CCW */
 354         cplength = 1 + 2 * nr_ccws;
 355         datasize = sizeof(struct DE_fba_data) +
 356                 nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
 357
 358         cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
 359         if (IS_ERR(cqr))
 360                 return cqr;
 361
 362         ccw = cqr->cpaddr;
 363
 364         define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count);
 365         LO_data = cqr->data + sizeof(struct DE_fba_data);
 366
 367         /* First part is not aligned. Calculate range to write zeroes. */
 368         if (first_rec % blocks_per_page != 0) {
 369                 wz_stop = first_rec + blocks_per_page -
 370                         (first_rec % blocks_per_page) - 1;
 371                 if (wz_stop > last_rec)
 372                         wz_stop = last_rec;
 373                 wz_count = wz_stop - first_rec + 1;
 374
 375                 ccw[-1].flags |= CCW_FLAG_CC;
 376                 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
 377
 378                 ccw[-1].flags |= CCW_FLAG_CC;
 379                 ccw_write_zero(ccw++, wz_count * blksize);
 380
 381                 cur_pos = wz_count;
 382         }
 383
 384         /* We can do proper discard when we've got at least blocks_per_page blocks. */
 385         if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
 386                 /* is last record at page boundary? */
 387                 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
 388                         d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
 389                                              blocks_per_page);
 390                 else
 391                         d_stop = last_rec;
 392
 393                 d_count = d_stop - (first_rec + cur_pos) + 1;
 394
 395                 ccw[-1].flags |= CCW_FLAG_CC;
 396                 locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count);
 397
 398                 ccw[-1].flags |= CCW_FLAG_CC;
 399                 ccw_write_no_data(ccw++);
 400
 401                 cur_pos += d_count;
 402         }
 403
 404         /* We might still have some bits left which need to be zeroed. */
 405         if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) {
 406                 if (d_stop != 0)
 407                         wz_count = last_rec - d_stop;
 408                 else if (wz_stop != 0)
 409                         wz_count = last_rec - wz_stop;
 410                 else
 411                         wz_count = count;
 412
 413                 ccw[-1].flags |= CCW_FLAG_CC;
 414                 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
 415
 416                 ccw[-1].flags |= CCW_FLAG_CC;
 417                 ccw_write_zero(ccw++, wz_count * blksize);
 418         }
 419
 420         if (blk_noretry_request(req) ||
 421             block->base->features & DASD_FEATURE_FAILFAST)
 422                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 423
 424         cqr->startdev = memdev;
 425         cqr->memdev = memdev;
 426         cqr->block = block;
 427         cqr->expires = memdev->default_expires * HZ;    /* default 5 minutes */
 428         cqr->retries = memdev->default_retries;
 429         cqr->buildclk = get_tod_clock();
 430         cqr->status = DASD_CQR_FILLED;
 431
 432         return cqr;
 433 }
 434
 435 static struct dasd_ccw_req *dasd_fba_build_cp_regular(
 436                                                 struct dasd_device *memdev,
 437                                                 struct dasd_block *block,
 438                                                 struct request *req)
 439 {
 440         struct dasd_fba_private *private = block->base->private;
 441         unsigned long *idaws;
 442         struct LO_fba_data *LO_data;
 443         struct dasd_ccw_req *cqr;
 444         struct ccw1 *ccw;
 445         struct req_iterator iter;
 446         struct bio_vec bv;
 447         char *dst;
 448         int count, cidaw, cplength, datasize;
 449         sector_t recid, first_rec, last_rec;
 450         unsigned int blksize, off;
 451         unsigned char cmd;
 452
 453         if (rq_data_dir(req) == READ) {
 454                 cmd = DASD_FBA_CCW_READ;
 455         } else if (rq_data_dir(req) == WRITE) {
 456                 cmd = DASD_FBA_CCW_WRITE;
 457         } else
 458                 return ERR_PTR(-EINVAL);
 459         blksize = block->bp_block;
 460         /* Calculate record id of first and last block. */
 461         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 462         last_rec =
 463                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 464         /* Check struct bio and count the number of blocks for the request. */
 465         count = 0;
 466         cidaw = 0;
 467         rq_for_each_segment(bv, req, iter) {
 468                 if (bv.bv_len & (blksize - 1))
 469                         /* Fba can only do full blocks. */
 470                         return ERR_PTR(-EINVAL);
 471                 count += bv.bv_len >> (block->s2b_shift + 9);
 472                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
 473                         cidaw += bv.bv_len / blksize;
 474         }
 475         /* Paranoia. */
 476         if (count != last_rec - first_rec + 1)
 477                 return ERR_PTR(-EINVAL);
 478         /* 1x define extent + 1x locate record + number of blocks */
 479         cplength = 2 + count;
 480         /* 1x define extent + 1x locate record */
 481         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 482                 cidaw * sizeof(unsigned long);
 483         /*
 484          * Find out number of additional locate record ccws if the device
 485          * can't do data chaining.
 486          */
 487         if (private->rdc_data.mode.bits.data_chain == 0) {
 488                 cplength += count - 1;
 489                 datasize += (count - 1)*sizeof(struct LO_fba_data);
 490         }
 491         /* Allocate the ccw request. */
 492         cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
 493         if (IS_ERR(cqr))
 494                 return cqr;
 495         ccw = cqr->cpaddr;
 496         /* First ccw is define extent. */
 497         define_extent(ccw++, cqr->data, rq_data_dir(req),
 498                       block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
 499         /* Build locate_record + read/write ccws. */
 500         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
 501         LO_data = (struct LO_fba_data *) (idaws + cidaw);
 502         /* Locate record for all blocks for smart devices. */
 503         if (private->rdc_data.mode.bits.data_chain != 0) {
 504                 ccw[-1].flags |= CCW_FLAG_CC;
 505                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
 506         }
 507         recid = first_rec;
 508         rq_for_each_segment(bv, req, iter) {
 509                 dst = page_address(bv.bv_page) + bv.bv_offset;
 510                 if (dasd_page_cache) {
 511                         char *copy = kmem_cache_alloc(dasd_page_cache,
 512                                                       GFP_DMA | __GFP_NOWARN);
 513                         if (copy && rq_data_dir(req) == WRITE)
 514                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
 515                         if (copy)
 516                                 dst = copy + bv.bv_offset;
 517                 }
 518                 for (off = 0; off < bv.bv_len; off += blksize) {
 519                         /* Locate record for stupid devices. */
 520                         if (private->rdc_data.mode.bits.data_chain == 0) {
 521                                 ccw[-1].flags |= CCW_FLAG_CC;
 522                                 locate_record(ccw, LO_data++,
 523                                               rq_data_dir(req),
 524                                               recid - first_rec, 1);
 525                                 ccw->flags = CCW_FLAG_CC;
 526                                 ccw++;
 527                         } else {
 528                                 if (recid > first_rec)
 529                                         ccw[-1].flags |= CCW_FLAG_DC;
 530                                 else
 531                                         ccw[-1].flags |= CCW_FLAG_CC;
 532                         }
 533                         ccw->cmd_code = cmd;
 534                         ccw->count = block->bp_block;
 535                         if (idal_is_needed(dst, blksize)) {
 536                                 ccw->cda = (__u32)(addr_t) idaws;
 537                                 ccw->flags = CCW_FLAG_IDA;
 538                                 idaws = idal_create_words(idaws, dst, blksize);
 539                         } else {
 540                                 ccw->cda = (__u32)(addr_t) dst;
 541                                 ccw->flags = 0;
 542                         }
 543                         ccw++;
 544                         dst += blksize;
 545                         recid++;
 546                 }
 547         }
 548         if (blk_noretry_request(req) ||
 549             block->base->features & DASD_FEATURE_FAILFAST)
 550                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 551         cqr->startdev = memdev;
 552         cqr->memdev = memdev;
 553         cqr->block = block;
 554         cqr->expires = memdev->default_expires * HZ;    /* default 5 minutes */
 555         cqr->retries = memdev->default_retries;
 556         cqr->buildclk = get_tod_clock();
 557         cqr->status = DASD_CQR_FILLED;
 558         return cqr;
 559 }
 560
 561 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev,
 562                                               struct dasd_block *block,
 563                                               struct request *req)
 564 {
 565         if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES)
 566                 return dasd_fba_build_cp_discard(memdev, block, req);
 567         else
 568                 return dasd_fba_build_cp_regular(memdev, block, req);
 569 }
 570
 571 static int
 572 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 573 {
 574         struct dasd_fba_private *private = cqr->block->base->private;
 575         struct ccw1 *ccw;
 576         struct req_iterator iter;
 577         struct bio_vec bv;
 578         char *dst, *cda;
 579         unsigned int blksize, off;
 580         int status;
 581
 582         if (!dasd_page_cache)
 583                 goto out;
 584         blksize = cqr->block->bp_block;
 585         ccw = cqr->cpaddr;
 586         /* Skip over define extent & locate record. */
 587         ccw++;
 588         if (private->rdc_data.mode.bits.data_chain != 0)
 589                 ccw++;
 590         rq_for_each_segment(bv, req, iter) {
 591                 dst = page_address(bv.bv_page) + bv.bv_offset;
 592                 for (off = 0; off < bv.bv_len; off += blksize) {
 593                         /* Skip locate record. */
 594                         if (private->rdc_data.mode.bits.data_chain == 0)
 595                                 ccw++;
 596                         if (dst) {
 597                                 if (ccw->flags & CCW_FLAG_IDA)
 598                                         cda = *((char **)((addr_t) ccw->cda));
 599                                 else
 600                                         cda = (char *)((addr_t) ccw->cda);
 601                                 if (dst != cda) {
 602                                         if (rq_data_dir(req) == READ)
 603                                                 memcpy(dst, cda, bv.bv_len);
 604                                         kmem_cache_free(dasd_page_cache,
 605                                             (void *)((addr_t)cda & PAGE_MASK));
 606                                 }
 607                                 dst = NULL;
 608                         }
 609                         ccw++;
 610                 }
 611         }
 612 out:
 613         status = cqr->status == DASD_CQR_DONE;
 614         dasd_sfree_request(cqr, cqr->memdev);
 615         return status;
 616 }
 617
 618 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
 619 {
 620         if (cqr->retries < 0)
 621                 cqr->status = DASD_CQR_FAILED;
 622         else
 623                 cqr->status = DASD_CQR_FILLED;
 624 };
 625
 626 static int
 627 dasd_fba_fill_info(struct dasd_device * device,
 628                    struct dasd_information2_t * info)
 629 {
 630         struct dasd_fba_private *private = device->private;
 631
 632         info->label_block = 1;
 633         info->FBA_layout = 1;
 634         info->format = DASD_FORMAT_LDL;
 635         info->characteristics_size = sizeof(private->rdc_data);
 636         memcpy(info->characteristics, &private->rdc_data,
 637                sizeof(private->rdc_data));
 638         info->confdata_size = 0;
 639         return 0;
 640 }
 641
 642 static void
 643 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
 644                         char *reason)
 645 {
 646         u64 *sense;
 647
 648         sense = (u64 *) dasd_get_sense(irb);
 649         if (sense) {
 650                 DBF_DEV_EVENT(DBF_EMERG, device,
 651                               "%s: %s %02x%02x%02x %016llx %016llx %016llx "
 652                               "%016llx", reason,
 653                               scsw_is_tm(&irb->scsw) ? "t" : "c",
 654                               scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
 655                               scsw_dstat(&irb->scsw), sense[0], sense[1],
 656                               sense[2], sense[3]);
 657         } else {
 658                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
 659                               "SORRY - NO VALID SENSE AVAILABLE\n");
 660         }
 661 }
 662
 663
 664 static void
 665 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 666                     struct irb *irb)
 667 {
 668         char *page;
 669         struct ccw1 *act, *end, *last;
 670         int len, sl, sct, count;
 671
 672         page = (char *) get_zeroed_page(GFP_ATOMIC);
 673         if (page == NULL) {
 674                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 675                             "No memory to dump sense data");
 676                 return;
 677         }
 678         len = sprintf(page, PRINTK_HEADER
 679                       " I/O status report for device %s:\n",
 680                       dev_name(&device->cdev->dev));
 681         len += sprintf(page + len, PRINTK_HEADER
 682                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 683                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 684         len += sprintf(page + len, PRINTK_HEADER
 685                        " device %s: Failing CCW: %p\n",
 686                        dev_name(&device->cdev->dev),
 687                        (void *) (addr_t) irb->scsw.cmd.cpa);
 688         if (irb->esw.esw0.erw.cons) {
 689                 for (sl = 0; sl < 4; sl++) {
 690                         len += sprintf(page + len, PRINTK_HEADER
 691                                        " Sense(hex) %2d-%2d:",
 692                                        (8 * sl), ((8 * sl) + 7));
 693
 694                         for (sct = 0; sct < 8; sct++) {
 695                                 len += sprintf(page + len, " %02x",
 696                                                irb->ecw[8 * sl + sct]);
 697                         }
 698                         len += sprintf(page + len, "\n");
 699                 }
 700         } else {
 701                 len += sprintf(page + len, PRINTK_HEADER
 702                                " SORRY - NO VALID SENSE AVAILABLE\n");
 703         }
 704         printk(KERN_ERR "%s", page);
 705
 706         /* dump the Channel Program */
 707         /* print first CCWs (maximum 8) */
 708         act = req->cpaddr;
 709         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 710         end = min(act + 8, last);
 711         len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
 712         while (act <= end) {
 713                 len += sprintf(page + len, PRINTK_HEADER
 714                                " CCW %p: %08X %08X DAT:",
 715                                act, ((int *) act)[0], ((int *) act)[1]);
 716                 for (count = 0; count < 32 && count < act->count;
 717                      count += sizeof(int))
 718                         len += sprintf(page + len, " %08X",
 719                                        ((int *) (addr_t) act->cda)
 720                                        [(count>>2)]);
 721                 len += sprintf(page + len, "\n");
 722                 act++;
 723         }
 724         printk(KERN_ERR "%s", page);
 725
 726
 727         /* print failing CCW area */
 728         len = 0;
 729         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
 730                 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
 731                 len += sprintf(page + len, PRINTK_HEADER "......\n");
 732         }
 733         end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
 734         while (act <= end) {
 735                 len += sprintf(page + len, PRINTK_HEADER
 736                                " CCW %p: %08X %08X DAT:",
 737                                act, ((int *) act)[0], ((int *) act)[1]);
 738                 for (count = 0; count < 32 && count < act->count;
 739                      count += sizeof(int))
 740                         len += sprintf(page + len, " %08X",
 741                                        ((int *) (addr_t) act->cda)
 742                                        [(count>>2)]);
 743                 len += sprintf(page + len, "\n");
 744                 act++;
 745         }
 746
 747         /* print last CCWs */
 748         if (act <  last - 2) {
 749                 act = last - 2;
 750                 len += sprintf(page + len, PRINTK_HEADER "......\n");
 751         }
 752         while (act <= last) {
 753                 len += sprintf(page + len, PRINTK_HEADER
 754                                " CCW %p: %08X %08X DAT:",
 755                                act, ((int *) act)[0], ((int *) act)[1]);
 756                 for (count = 0; count < 32 && count < act->count;
 757                      count += sizeof(int))
 758                         len += sprintf(page + len, " %08X",
 759                                        ((int *) (addr_t) act->cda)
 760                                        [(count>>2)]);
 761                 len += sprintf(page + len, "\n");
 762                 act++;
 763         }
 764         if (len > 0)
 765                 printk(KERN_ERR "%s", page);
 766         free_page((unsigned long) page);
 767 }
 768
 769 /*
 770  * max_blocks is dependent on the amount of storage that is available
 771  * in the static io buffer for each device. Currently each device has
 772  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 773  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 774  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 775  * addition we have one define extent ccw + 16 bytes of data and a
 776  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
 777  * That makes:
 778  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
 779  * We want to fit two into the available memory so that we can immediately
 780  * start the next request if one finishes off. That makes 100.1 blocks
 781  * for one request. Give a little safety and the result is 96.
 782  */
 783 static struct dasd_discipline dasd_fba_discipline = {
 784         .owner = THIS_MODULE,
 785         .name = "FBA ",
 786         .ebcname = "FBA ",
 787         .max_blocks = 96,
 788         .check_device = dasd_fba_check_characteristics,
 789         .do_analysis = dasd_fba_do_analysis,
 790         .verify_path = dasd_generic_verify_path,
 791         .fill_geometry = dasd_fba_fill_geometry,
 792         .start_IO = dasd_start_IO,
 793         .term_IO = dasd_term_IO,
 794         .handle_terminated_request = dasd_fba_handle_terminated_request,
 795         .erp_action = dasd_fba_erp_action,
 796         .erp_postaction = dasd_fba_erp_postaction,
 797         .check_for_device_change = dasd_fba_check_for_device_change,
 798         .build_cp = dasd_fba_build_cp,
 799         .free_cp = dasd_fba_free_cp,
 800         .dump_sense = dasd_fba_dump_sense,
 801         .dump_sense_dbf = dasd_fba_dump_sense_dbf,
 802         .fill_info = dasd_fba_fill_info,
 803 };
 804
 805 static int __init
 806 dasd_fba_init(void)
 807 {
 808         int ret;
 809
 810         ASCEBC(dasd_fba_discipline.ebcname, 4);
 811         ret = ccw_driver_register(&dasd_fba_driver);
 812         if (!ret)
 813                 wait_for_device_probe();
 814
 815         return ret;
 816 }
 817
 818 static void __exit
 819 dasd_fba_cleanup(void)
 820 {
 821         ccw_driver_unregister(&dasd_fba_driver);
 822 }
 823
 824 module_init(dasd_fba_init);
 825 module_exit(dasd_fba_cleanup);