drivers/s390/block/dasd_fba.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Bugreports.to..: <Linux390@de.ibm.com>
   5  * Copyright IBM Corp. 1999, 2009
   6  */
   7
   8 #define KMSG_COMPONENT "dasd-fba"
   9
  10 #include <linux/stddef.h>
  11 #include <linux/kernel.h>
  12 #include <asm/debug.h>
  13
  14 #include <linux/slab.h>
  15 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  16 #include <linux/bio.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/idals.h>
  21 #include <asm/ebcdic.h>
  22 #include <asm/io.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 FBA_DEFAULT_RETRIES 32
  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 static void *dasd_fba_zero_page;
  44
  45 struct dasd_fba_private {
  46         struct dasd_fba_characteristics rdc_data;
  47 };
  48
  49 static struct ccw_device_id dasd_fba_ids[] = {
  50         { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
  51         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
  52         { /* end of list */ },
  53 };
  54
  55 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
  56
  57 static struct ccw_driver dasd_fba_driver; /* see below */
  58 static int
  59 dasd_fba_probe(struct ccw_device *cdev)
  60 {
  61         return dasd_generic_probe(cdev, &dasd_fba_discipline);
  62 }
  63
  64 static int
  65 dasd_fba_set_online(struct ccw_device *cdev)
  66 {
  67         return dasd_generic_set_online(cdev, &dasd_fba_discipline);
  68 }
  69
  70 static struct ccw_driver dasd_fba_driver = {
  71         .driver = {
  72                 .name   = "dasd-fba",
  73                 .owner  = THIS_MODULE,
  74         },
  75         .ids         = dasd_fba_ids,
  76         .probe       = dasd_fba_probe,
  77         .remove      = dasd_generic_remove,
  78         .set_offline = dasd_generic_set_offline,
  79         .set_online  = dasd_fba_set_online,
  80         .notify      = dasd_generic_notify,
  81         .path_event  = dasd_generic_path_event,
  82         .int_class   = IRQIO_DAS,
  83 };
  84
  85 static void
  86 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
  87               int blksize, int beg, int nr)
  88 {
  89         ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
  90         ccw->flags = 0;
  91         ccw->count = 16;
  92         ccw->cda = (__u32) __pa(data);
  93         memset(data, 0, sizeof (struct DE_fba_data));
  94         if (rw == WRITE)
  95                 (data->mask).perm = 0x0;
  96         else if (rw == READ)
  97                 (data->mask).perm = 0x1;
  98         else
  99                 data->mask.perm = 0x2;
 100         data->blk_size = blksize;
 101         data->ext_loc = beg;
 102         data->ext_end = nr - 1;
 103 }
 104
 105 static void
 106 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
 107               int block_nr, int block_ct)
 108 {
 109         ccw->cmd_code = DASD_FBA_CCW_LOCATE;
 110         ccw->flags = 0;
 111         ccw->count = 8;
 112         ccw->cda = (__u32) __pa(data);
 113         memset(data, 0, sizeof (struct LO_fba_data));
 114         if (rw == WRITE)
 115                 data->operation.cmd = 0x5;
 116         else if (rw == READ)
 117                 data->operation.cmd = 0x6;
 118         else
 119                 data->operation.cmd = 0x8;
 120         data->blk_nr = block_nr;
 121         data->blk_ct = block_ct;
 122 }
 123
 124 static int
 125 dasd_fba_check_characteristics(struct dasd_device *device)
 126 {
 127         struct dasd_fba_private *private = device->private;
 128         struct ccw_device *cdev = device->cdev;
 129         struct dasd_block *block;
 130         int readonly, rc;
 131
 132         if (!private) {
 133                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
 134                 if (!private) {
 135                         dev_warn(&device->cdev->dev,
 136                                  "Allocating memory for private DASD "
 137                                  "data failed\n");
 138                         return -ENOMEM;
 139                 }
 140                 device->private = private;
 141         } else {
 142                 memset(private, 0, sizeof(*private));
 143         }
 144         block = dasd_alloc_block();
 145         if (IS_ERR(block)) {
 146                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
 147                                 "dasd block structure");
 148                 device->private = NULL;
 149                 kfree(private);
 150                 return PTR_ERR(block);
 151         }
 152         device->block = block;
 153         block->base = device;
 154
 155         /* Read Device Characteristics */
 156         rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
 157                                          &private->rdc_data, 32);
 158         if (rc) {
 159                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
 160                                 "characteristics returned error %d", rc);
 161                 device->block = NULL;
 162                 dasd_free_block(block);
 163                 device->private = NULL;
 164                 kfree(private);
 165                 return rc;
 166         }
 167
 168         device->default_expires = DASD_EXPIRES;
 169         device->default_retries = FBA_DEFAULT_RETRIES;
 170         dasd_path_set_opm(device, LPM_ANYPATH);
 171
 172         readonly = dasd_device_is_ro(device);
 173         if (readonly)
 174                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 175
 176         /* FBA supports discard, set the according feature bit */
 177         dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
 178
 179         dev_info(&device->cdev->dev,
 180                  "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
 181                  "and %d B/blk%s\n",
 182                  cdev->id.dev_type,
 183                  cdev->id.dev_model,
 184                  cdev->id.cu_type,
 185                  cdev->id.cu_model,
 186                  ((private->rdc_data.blk_bdsa *
 187                    (private->rdc_data.blk_size >> 9)) >> 11),
 188                  private->rdc_data.blk_size,
 189                  readonly ? ", read-only device" : "");
 190         return 0;
 191 }
 192
 193 static int dasd_fba_do_analysis(struct dasd_block *block)
 194 {
 195         struct dasd_fba_private *private = block->base->private;
 196         int sb, rc;
 197
 198         rc = dasd_check_blocksize(private->rdc_data.blk_size);
 199         if (rc) {
 200                 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
 201                             private->rdc_data.blk_size);
 202                 return rc;
 203         }
 204         block->blocks = private->rdc_data.blk_bdsa;
 205         block->bp_block = private->rdc_data.blk_size;
 206         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 207         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 208                 block->s2b_shift++;
 209         return 0;
 210 }
 211
 212 static int dasd_fba_fill_geometry(struct dasd_block *block,
 213                                   struct hd_geometry *geo)
 214 {
 215         if (dasd_check_blocksize(block->bp_block) != 0)
 216                 return -EINVAL;
 217         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 218         geo->heads = 16;
 219         geo->sectors = 128 >> block->s2b_shift;
 220         return 0;
 221 }
 222
 223 static dasd_erp_fn_t
 224 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 225 {
 226         return dasd_default_erp_action;
 227 }
 228
 229 static dasd_erp_fn_t
 230 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 231 {
 232         if (cqr->function == dasd_default_erp_action)
 233                 return dasd_default_erp_postaction;
 234
 235         DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
 236                     cqr->function);
 237         return NULL;
 238 }
 239
 240 static void dasd_fba_check_for_device_change(struct dasd_device *device,
 241                                              struct dasd_ccw_req *cqr,
 242                                              struct irb *irb)
 243 {
 244         char mask;
 245
 246         /* first of all check for state change pending interrupt */
 247         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
 248         if ((irb->scsw.cmd.dstat & mask) == mask)
 249                 dasd_generic_handle_state_change(device);
 250 };
 251
 252
 253 /*
 254  * Builds a CCW with no data payload
 255  */
 256 static void ccw_write_no_data(struct ccw1 *ccw)
 257 {
 258         ccw->cmd_code = DASD_FBA_CCW_WRITE;
 259         ccw->flags |= CCW_FLAG_SLI;
 260         ccw->count = 0;
 261 }
 262
 263 /*
 264  * Builds a CCW that writes only zeroes.
 265  */
 266 static void ccw_write_zero(struct ccw1 *ccw, int count)
 267 {
 268         ccw->cmd_code = DASD_FBA_CCW_WRITE;
 269         ccw->flags |= CCW_FLAG_SLI;
 270         ccw->count = count;
 271         ccw->cda = (__u32) (addr_t) dasd_fba_zero_page;
 272 }
 273
 274 /*
 275  * Helper function to count the amount of necessary CCWs within a given range
 276  * with 4k alignment and command chaining in mind.
 277  */
 278 static int count_ccws(sector_t first_rec, sector_t last_rec,
 279                       unsigned int blocks_per_page)
 280 {
 281         sector_t wz_stop = 0, d_stop = 0;
 282         int cur_pos = 0;
 283         int count = 0;
 284
 285         if (first_rec % blocks_per_page != 0) {
 286                 wz_stop = first_rec + blocks_per_page -
 287                         (first_rec % blocks_per_page) - 1;
 288                 if (wz_stop > last_rec)
 289                         wz_stop = last_rec;
 290                 cur_pos = wz_stop - first_rec + 1;
 291                 count++;
 292         }
 293
 294         if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
 295                 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
 296                         d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
 297                                              blocks_per_page);
 298                 else
 299                         d_stop = last_rec;
 300
 301                 cur_pos += d_stop - (first_rec + cur_pos) + 1;
 302                 count++;
 303         }
 304
 305         if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
 306                 count++;
 307
 308         return count;
 309 }
 310
 311 /*
 312  * This function builds a CCW request for block layer discard requests.
 313  * Each page in the z/VM hypervisor that represents certain records of an FBA
 314  * device will be padded with zeros. This is a special behaviour of the WRITE
 315  * command which is triggered when no data payload is added to the CCW.
 316  *
 317  * Note: Due to issues in some z/VM versions, we can't fully utilise this
 318  * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
 319  * work around those issues and write actual zeroes to the unaligned parts in
 320  * the request. This workaround might be removed in the future.
 321  */
 322 static struct dasd_ccw_req *dasd_fba_build_cp_discard(
 323                                                 struct dasd_device *memdev,
 324                                                 struct dasd_block *block,
 325                                                 struct request *req)
 326 {
 327         struct LO_fba_data *LO_data;
 328         struct dasd_ccw_req *cqr;
 329         struct ccw1 *ccw;
 330
 331         sector_t wz_stop = 0, d_stop = 0;
 332         sector_t first_rec, last_rec;
 333
 334         unsigned int blksize = block->bp_block;
 335         unsigned int blocks_per_page;
 336         int wz_count = 0;
 337         int d_count = 0;
 338         int cur_pos = 0; /* Current position within the extent */
 339         int count = 0;
 340         int cplength;
 341         int datasize;
 342         int nr_ccws;
 343
 344         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 345         last_rec =
 346                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 347         count = last_rec - first_rec + 1;
 348
 349         blocks_per_page = BLOCKS_PER_PAGE(blksize);
 350         nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
 351
 352         /* define extent + nr_ccws * locate record + nr_ccws * single CCW */
 353         cplength = 1 + 2 * nr_ccws;
 354         datasize = sizeof(struct DE_fba_data) +
 355                 nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
 356
 357         cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
 358                                    blk_mq_rq_to_pdu(req));
 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                                    blk_mq_rq_to_pdu(req));
 494         if (IS_ERR(cqr))
 495                 return cqr;
 496         ccw = cqr->cpaddr;
 497         /* First ccw is define extent. */
 498         define_extent(ccw++, cqr->data, rq_data_dir(req),
 499                       block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
 500         /* Build locate_record + read/write ccws. */
 501         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
 502         LO_data = (struct LO_fba_data *) (idaws + cidaw);
 503         /* Locate record for all blocks for smart devices. */
 504         if (private->rdc_data.mode.bits.data_chain != 0) {
 505                 ccw[-1].flags |= CCW_FLAG_CC;
 506                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
 507         }
 508         recid = first_rec;
 509         rq_for_each_segment(bv, req, iter) {
 510                 dst = page_address(bv.bv_page) + bv.bv_offset;
 511                 if (dasd_page_cache) {
 512                         char *copy = kmem_cache_alloc(dasd_page_cache,
 513                                                       GFP_DMA | __GFP_NOWARN);
 514                         if (copy && rq_data_dir(req) == WRITE)
 515                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
 516                         if (copy)
 517                                 dst = copy + bv.bv_offset;
 518                 }
 519                 for (off = 0; off < bv.bv_len; off += blksize) {
 520                         /* Locate record for stupid devices. */
 521                         if (private->rdc_data.mode.bits.data_chain == 0) {
 522                                 ccw[-1].flags |= CCW_FLAG_CC;
 523                                 locate_record(ccw, LO_data++,
 524                                               rq_data_dir(req),
 525                                               recid - first_rec, 1);
 526                                 ccw->flags = CCW_FLAG_CC;
 527                                 ccw++;
 528                         } else {
 529                                 if (recid > first_rec)
 530                                         ccw[-1].flags |= CCW_FLAG_DC;
 531                                 else
 532                                         ccw[-1].flags |= CCW_FLAG_CC;
 533                         }
 534                         ccw->cmd_code = cmd;
 535                         ccw->count = block->bp_block;
 536                         if (idal_is_needed(dst, blksize)) {
 537                                 ccw->cda = (__u32)(addr_t) idaws;
 538                                 ccw->flags = CCW_FLAG_IDA;
 539                                 idaws = idal_create_words(idaws, dst, blksize);
 540                         } else {
 541                                 ccw->cda = (__u32)(addr_t) dst;
 542                                 ccw->flags = 0;
 543                         }
 544                         ccw++;
 545                         dst += blksize;
 546                         recid++;
 547                 }
 548         }
 549         if (blk_noretry_request(req) ||
 550             block->base->features & DASD_FEATURE_FAILFAST)
 551                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 552         cqr->startdev = memdev;
 553         cqr->memdev = memdev;
 554         cqr->block = block;
 555         cqr->expires = memdev->default_expires * HZ;    /* default 5 minutes */
 556         cqr->retries = memdev->default_retries;
 557         cqr->buildclk = get_tod_clock();
 558         cqr->status = DASD_CQR_FILLED;
 559         return cqr;
 560 }
 561
 562 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev,
 563                                               struct dasd_block *block,
 564                                               struct request *req)
 565 {
 566         if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES)
 567                 return dasd_fba_build_cp_discard(memdev, block, req);
 568         else
 569                 return dasd_fba_build_cp_regular(memdev, block, req);
 570 }
 571
 572 static int
 573 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 574 {
 575         struct dasd_fba_private *private = cqr->block->base->private;
 576         struct ccw1 *ccw;
 577         struct req_iterator iter;
 578         struct bio_vec bv;
 579         char *dst, *cda;
 580         unsigned int blksize, off;
 581         int status;
 582
 583         if (!dasd_page_cache)
 584                 goto out;
 585         blksize = cqr->block->bp_block;
 586         ccw = cqr->cpaddr;
 587         /* Skip over define extent & locate record. */
 588         ccw++;
 589         if (private->rdc_data.mode.bits.data_chain != 0)
 590                 ccw++;
 591         rq_for_each_segment(bv, req, iter) {
 592                 dst = page_address(bv.bv_page) + bv.bv_offset;
 593                 for (off = 0; off < bv.bv_len; off += blksize) {
 594                         /* Skip locate record. */
 595                         if (private->rdc_data.mode.bits.data_chain == 0)
 596                                 ccw++;
 597                         if (dst) {
 598                                 if (ccw->flags & CCW_FLAG_IDA)
 599                                         cda = *((char **)((addr_t) ccw->cda));
 600                                 else
 601                                         cda = (char *)((addr_t) ccw->cda);
 602                                 if (dst != cda) {
 603                                         if (rq_data_dir(req) == READ)
 604                                                 memcpy(dst, cda, bv.bv_len);
 605                                         kmem_cache_free(dasd_page_cache,
 606                                             (void *)((addr_t)cda & PAGE_MASK));
 607                                 }
 608                                 dst = NULL;
 609                         }
 610                         ccw++;
 611                 }
 612         }
 613 out:
 614         status = cqr->status == DASD_CQR_DONE;
 615         dasd_sfree_request(cqr, cqr->memdev);
 616         return status;
 617 }
 618
 619 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
 620 {
 621         if (cqr->retries < 0)
 622                 cqr->status = DASD_CQR_FAILED;
 623         else
 624                 cqr->status = DASD_CQR_FILLED;
 625 };
 626
 627 static int
 628 dasd_fba_fill_info(struct dasd_device * device,
 629                    struct dasd_information2_t * info)
 630 {
 631         struct dasd_fba_private *private = device->private;
 632
 633         info->label_block = 1;
 634         info->FBA_layout = 1;
 635         info->format = DASD_FORMAT_LDL;
 636         info->characteristics_size = sizeof(private->rdc_data);
 637         memcpy(info->characteristics, &private->rdc_data,
 638                sizeof(private->rdc_data));
 639         info->confdata_size = 0;
 640         return 0;
 641 }
 642
 643 static void
 644 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
 645                         char *reason)
 646 {
 647         u64 *sense;
 648
 649         sense = (u64 *) dasd_get_sense(irb);
 650         if (sense) {
 651                 DBF_DEV_EVENT(DBF_EMERG, device,
 652                               "%s: %s %02x%02x%02x %016llx %016llx %016llx "
 653                               "%016llx", reason,
 654                               scsw_is_tm(&irb->scsw) ? "t" : "c",
 655                               scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
 656                               scsw_dstat(&irb->scsw), sense[0], sense[1],
 657                               sense[2], sense[3]);
 658         } else {
 659                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
 660                               "SORRY - NO VALID SENSE AVAILABLE\n");
 661         }
 662 }
 663
 664
 665 static void
 666 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 667                     struct irb *irb)
 668 {
 669         char *page;
 670         struct ccw1 *act, *end, *last;
 671         int len, sl, sct, count;
 672
 673         page = (char *) get_zeroed_page(GFP_ATOMIC);
 674         if (page == NULL) {
 675                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 676                             "No memory to dump sense data");
 677                 return;
 678         }
 679         len = sprintf(page, PRINTK_HEADER
 680                       " I/O status report for device %s:\n",
 681                       dev_name(&device->cdev->dev));
 682         len += sprintf(page + len, PRINTK_HEADER
 683                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 684                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 685         len += sprintf(page + len, PRINTK_HEADER
 686                        " device %s: Failing CCW: %p\n",
 687                        dev_name(&device->cdev->dev),
 688                        (void *) (addr_t) irb->scsw.cmd.cpa);
 689         if (irb->esw.esw0.erw.cons) {
 690                 for (sl = 0; sl < 4; sl++) {
 691                         len += sprintf(page + len, PRINTK_HEADER
 692                                        " Sense(hex) %2d-%2d:",
 693                                        (8 * sl), ((8 * sl) + 7));
 694
 695                         for (sct = 0; sct < 8; sct++) {
 696                                 len += sprintf(page + len, " %02x",
 697                                                irb->ecw[8 * sl + sct]);
 698                         }
 699                         len += sprintf(page + len, "\n");
 700                 }
 701         } else {
 702                 len += sprintf(page + len, PRINTK_HEADER
 703                                " SORRY - NO VALID SENSE AVAILABLE\n");
 704         }
 705         printk(KERN_ERR "%s", page);
 706
 707         /* dump the Channel Program */
 708         /* print first CCWs (maximum 8) */
 709         act = req->cpaddr;
 710         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 711         end = min(act + 8, last);
 712         len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
 713         while (act <= end) {
 714                 len += sprintf(page + len, PRINTK_HEADER
 715                                " CCW %p: %08X %08X DAT:",
 716                                act, ((int *) act)[0], ((int *) act)[1]);
 717                 for (count = 0; count < 32 && count < act->count;
 718                      count += sizeof(int))
 719                         len += sprintf(page + len, " %08X",
 720                                        ((int *) (addr_t) act->cda)
 721                                        [(count>>2)]);
 722                 len += sprintf(page + len, "\n");
 723                 act++;
 724         }
 725         printk(KERN_ERR "%s", page);
 726
 727
 728         /* print failing CCW area */
 729         len = 0;
 730         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
 731                 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
 732                 len += sprintf(page + len, PRINTK_HEADER "......\n");
 733         }
 734         end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
 735         while (act <= end) {
 736                 len += sprintf(page + len, PRINTK_HEADER
 737                                " CCW %p: %08X %08X DAT:",
 738                                act, ((int *) act)[0], ((int *) act)[1]);
 739                 for (count = 0; count < 32 && count < act->count;
 740                      count += sizeof(int))
 741                         len += sprintf(page + len, " %08X",
 742                                        ((int *) (addr_t) act->cda)
 743                                        [(count>>2)]);
 744                 len += sprintf(page + len, "\n");
 745                 act++;
 746         }
 747
 748         /* print last CCWs */
 749         if (act <  last - 2) {
 750                 act = last - 2;
 751                 len += sprintf(page + len, PRINTK_HEADER "......\n");
 752         }
 753         while (act <= last) {
 754                 len += sprintf(page + len, PRINTK_HEADER
 755                                " CCW %p: %08X %08X DAT:",
 756                                act, ((int *) act)[0], ((int *) act)[1]);
 757                 for (count = 0; count < 32 && count < act->count;
 758                      count += sizeof(int))
 759                         len += sprintf(page + len, " %08X",
 760                                        ((int *) (addr_t) act->cda)
 761                                        [(count>>2)]);
 762                 len += sprintf(page + len, "\n");
 763                 act++;
 764         }
 765         if (len > 0)
 766                 printk(KERN_ERR "%s", page);
 767         free_page((unsigned long) page);
 768 }
 769
 770 /*
 771  * Initialize block layer request queue.
 772  */
 773 static void dasd_fba_setup_blk_queue(struct dasd_block *block)
 774 {
 775         unsigned int logical_block_size = block->bp_block;
 776         struct request_queue *q = block->request_queue;
 777         unsigned int max_bytes, max_discard_sectors;
 778         int max;
 779
 780         max = DASD_FBA_MAX_BLOCKS << block->s2b_shift;
 781         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
 782         q->limits.max_dev_sectors = max;
 783         blk_queue_logical_block_size(q, logical_block_size);
 784         blk_queue_max_hw_sectors(q, max);
 785         blk_queue_max_segments(q, USHRT_MAX);
 786         /* With page sized segments each segment can be translated into one idaw/tidaw */
 787         blk_queue_max_segment_size(q, PAGE_SIZE);
 788         blk_queue_segment_boundary(q, PAGE_SIZE - 1);
 789
 790         q->limits.discard_granularity = logical_block_size;
 791         q->limits.discard_alignment = PAGE_SIZE;
 792
 793         /* Calculate max_discard_sectors and make it PAGE aligned */
 794         max_bytes = USHRT_MAX * logical_block_size;
 795         max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE);
 796         max_discard_sectors = max_bytes / logical_block_size;
 797
 798         blk_queue_max_discard_sectors(q, max_discard_sectors);
 799         blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
 800         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 801 }
 802
 803 static struct dasd_discipline dasd_fba_discipline = {
 804         .owner = THIS_MODULE,
 805         .name = "FBA ",
 806         .ebcname = "FBA ",
 807         .check_device = dasd_fba_check_characteristics,
 808         .do_analysis = dasd_fba_do_analysis,
 809         .verify_path = dasd_generic_verify_path,
 810         .setup_blk_queue = dasd_fba_setup_blk_queue,
 811         .fill_geometry = dasd_fba_fill_geometry,
 812         .start_IO = dasd_start_IO,
 813         .term_IO = dasd_term_IO,
 814         .handle_terminated_request = dasd_fba_handle_terminated_request,
 815         .erp_action = dasd_fba_erp_action,
 816         .erp_postaction = dasd_fba_erp_postaction,
 817         .check_for_device_change = dasd_fba_check_for_device_change,
 818         .build_cp = dasd_fba_build_cp,
 819         .free_cp = dasd_fba_free_cp,
 820         .dump_sense = dasd_fba_dump_sense,
 821         .dump_sense_dbf = dasd_fba_dump_sense_dbf,
 822         .fill_info = dasd_fba_fill_info,
 823 };
 824
 825 static int __init
 826 dasd_fba_init(void)
 827 {
 828         int ret;
 829
 830         ASCEBC(dasd_fba_discipline.ebcname, 4);
 831
 832         dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 833         if (!dasd_fba_zero_page)
 834                 return -ENOMEM;
 835
 836         ret = ccw_driver_register(&dasd_fba_driver);
 837         if (!ret)
 838                 wait_for_device_probe();
 839
 840         return ret;
 841 }
 842
 843 static void __exit
 844 dasd_fba_cleanup(void)
 845 {
 846         ccw_driver_unregister(&dasd_fba_driver);
 847         free_page((unsigned long)dasd_fba_zero_page);
 848 }
 849
 850 module_init(dasd_fba_init);
 851 module_exit(dasd_fba_cleanup);