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
  44 struct dasd_fba_private {
  45         struct dasd_fba_characteristics rdc_data;
  46 };
  47
  48 static struct ccw_device_id dasd_fba_ids[] = {
  49         { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
  50         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
  51         { /* end of list */ },
  52 };
  53
  54 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
  55
  56 static struct ccw_driver dasd_fba_driver; /* see below */
  57 static int
  58 dasd_fba_probe(struct ccw_device *cdev)
  59 {
  60         return dasd_generic_probe(cdev, &dasd_fba_discipline);
  61 }
  62
  63 static int
  64 dasd_fba_set_online(struct ccw_device *cdev)
  65 {
  66         return dasd_generic_set_online(cdev, &dasd_fba_discipline);
  67 }
  68
  69 static struct ccw_driver dasd_fba_driver = {
  70         .driver = {
  71                 .name   = "dasd-fba",
  72                 .owner  = THIS_MODULE,
  73         },
  74         .ids         = dasd_fba_ids,
  75         .probe       = dasd_fba_probe,
  76         .remove      = dasd_generic_remove,
  77         .set_offline = dasd_generic_set_offline,
  78         .set_online  = dasd_fba_set_online,
  79         .notify      = dasd_generic_notify,
  80         .path_event  = dasd_generic_path_event,
  81         .freeze      = dasd_generic_pm_freeze,
  82         .thaw        = dasd_generic_restore_device,
  83         .restore     = dasd_generic_restore_device,
  84         .int_class   = IRQIO_DAS,
  85 };
  86
  87 static void
  88 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
  89               int blksize, int beg, int nr)
  90 {
  91         ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
  92         ccw->flags = 0;
  93         ccw->count = 16;
  94         ccw->cda = (__u32) __pa(data);
  95         memset(data, 0, sizeof (struct DE_fba_data));
  96         if (rw == WRITE)
  97                 (data->mask).perm = 0x0;
  98         else if (rw == READ)
  99                 (data->mask).perm = 0x1;
 100         else
 101                 data->mask.perm = 0x2;
 102         data->blk_size = blksize;
 103         data->ext_loc = beg;
 104         data->ext_end = nr - 1;
 105 }
 106
 107 static void
 108 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
 109               int block_nr, int block_ct)
 110 {
 111         ccw->cmd_code = DASD_FBA_CCW_LOCATE;
 112         ccw->flags = 0;
 113         ccw->count = 8;
 114         ccw->cda = (__u32) __pa(data);
 115         memset(data, 0, sizeof (struct LO_fba_data));
 116         if (rw == WRITE)
 117                 data->operation.cmd = 0x5;
 118         else if (rw == READ)
 119                 data->operation.cmd = 0x6;
 120         else
 121                 data->operation.cmd = 0x8;
 122         data->blk_nr = block_nr;
 123         data->blk_ct = block_ct;
 124 }
 125
 126 static int
 127 dasd_fba_check_characteristics(struct dasd_device *device)
 128 {
 129         struct dasd_fba_private *private = device->private;
 130         struct ccw_device *cdev = device->cdev;
 131         struct dasd_block *block;
 132         int readonly, rc;
 133
 134         if (!private) {
 135                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
 136                 if (!private) {
 137                         dev_warn(&device->cdev->dev,
 138                                  "Allocating memory for private DASD "
 139                                  "data failed\n");
 140                         return -ENOMEM;
 141                 }
 142                 device->private = private;
 143         } else {
 144                 memset(private, 0, sizeof(*private));
 145         }
 146         block = dasd_alloc_block();
 147         if (IS_ERR(block)) {
 148                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
 149                                 "dasd block structure");
 150                 device->private = NULL;
 151                 kfree(private);
 152                 return PTR_ERR(block);
 153         }
 154         device->block = block;
 155         block->base = device;
 156
 157         /* Read Device Characteristics */
 158         rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
 159                                          &private->rdc_data, 32);
 160         if (rc) {
 161                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
 162                                 "characteristics returned error %d", rc);
 163                 device->block = NULL;
 164                 dasd_free_block(block);
 165                 device->private = NULL;
 166                 kfree(private);
 167                 return rc;
 168         }
 169
 170         device->default_expires = DASD_EXPIRES;
 171         device->default_retries = FBA_DEFAULT_RETRIES;
 172         dasd_path_set_opm(device, LPM_ANYPATH);
 173
 174         readonly = dasd_device_is_ro(device);
 175         if (readonly)
 176                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 177
 178         /* FBA supports discard, set the according feature bit */
 179         dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
 180
 181         dev_info(&device->cdev->dev,
 182                  "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
 183                  "and %d B/blk%s\n",
 184                  cdev->id.dev_type,
 185                  cdev->id.dev_model,
 186                  cdev->id.cu_type,
 187                  cdev->id.cu_model,
 188                  ((private->rdc_data.blk_bdsa *
 189                    (private->rdc_data.blk_size >> 9)) >> 11),
 190                  private->rdc_data.blk_size,
 191                  readonly ? ", read-only device" : "");
 192         return 0;
 193 }
 194
 195 static int dasd_fba_do_analysis(struct dasd_block *block)
 196 {
 197         struct dasd_fba_private *private = block->base->private;
 198         int sb, rc;
 199
 200         rc = dasd_check_blocksize(private->rdc_data.blk_size);
 201         if (rc) {
 202                 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
 203                             private->rdc_data.blk_size);
 204                 return rc;
 205         }
 206         block->blocks = private->rdc_data.blk_bdsa;
 207         block->bp_block = private->rdc_data.blk_size;
 208         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 209         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 210                 block->s2b_shift++;
 211         return 0;
 212 }
 213
 214 static int dasd_fba_fill_geometry(struct dasd_block *block,
 215                                   struct hd_geometry *geo)
 216 {
 217         if (dasd_check_blocksize(block->bp_block) != 0)
 218                 return -EINVAL;
 219         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 220         geo->heads = 16;
 221         geo->sectors = 128 >> block->s2b_shift;
 222         return 0;
 223 }
 224
 225 static dasd_erp_fn_t
 226 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 227 {
 228         return dasd_default_erp_action;
 229 }
 230
 231 static dasd_erp_fn_t
 232 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 233 {
 234         if (cqr->function == dasd_default_erp_action)
 235                 return dasd_default_erp_postaction;
 236
 237         DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
 238                     cqr->function);
 239         return NULL;
 240 }
 241
 242 static void dasd_fba_check_for_device_change(struct dasd_device *device,
 243                                              struct dasd_ccw_req *cqr,
 244                                              struct irb *irb)
 245 {
 246         char mask;
 247
 248         /* first of all check for state change pending interrupt */
 249         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
 250         if ((irb->scsw.cmd.dstat & mask) == mask)
 251                 dasd_generic_handle_state_change(device);
 252 };
 253
 254
 255 /*
 256  * Builds a CCW with no data payload
 257  */
 258 static void ccw_write_no_data(struct ccw1 *ccw)
 259 {
 260         ccw->cmd_code = DASD_FBA_CCW_WRITE;
 261         ccw->flags |= CCW_FLAG_SLI;
 262         ccw->count = 0;
 263 }
 264
 265 /*
 266  * Builds a CCW that writes only zeroes.
 267  */
 268 static void ccw_write_zero(struct ccw1 *ccw, int count)
 269 {
 270         ccw->cmd_code = DASD_FBA_CCW_WRITE;
 271         ccw->flags |= CCW_FLAG_SLI;
 272         ccw->count = count;
 273         ccw->cda = (__u32) (addr_t) page_to_phys(ZERO_PAGE(0));
 274 }
 275
 276 /*
 277  * Helper function to count the amount of necessary CCWs within a given range
 278  * with 4k alignment and command chaining in mind.
 279  */
 280 static int count_ccws(sector_t first_rec, sector_t last_rec,
 281                       unsigned int blocks_per_page)
 282 {
 283         sector_t wz_stop = 0, d_stop = 0;
 284         int cur_pos = 0;
 285         int count = 0;
 286
 287         if (first_rec % blocks_per_page != 0) {
 288                 wz_stop = first_rec + blocks_per_page -
 289                         (first_rec % blocks_per_page) - 1;
 290                 if (wz_stop > last_rec)
 291                         wz_stop = last_rec;
 292                 cur_pos = wz_stop - first_rec + 1;
 293                 count++;
 294         }
 295
 296         if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
 297                 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
 298                         d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
 299                                              blocks_per_page);
 300                 else
 301                         d_stop = last_rec;
 302
 303                 cur_pos += d_stop - (first_rec + cur_pos) + 1;
 304                 count++;
 305         }
 306
 307         if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
 308                 count++;
 309
 310         return count;
 311 }
 312
 313 /*
 314  * This function builds a CCW request for block layer discard requests.
 315  * Each page in the z/VM hypervisor that represents certain records of an FBA
 316  * device will be padded with zeros. This is a special behaviour of the WRITE
 317  * command which is triggered when no data payload is added to the CCW.
 318  *
 319  * Note: Due to issues in some z/VM versions, we can't fully utilise this
 320  * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
 321  * work around those issues and write actual zeroes to the unaligned parts in
 322  * the request. This workaround might be removed in the future.
 323  */
 324 static struct dasd_ccw_req *dasd_fba_build_cp_discard(
 325                                                 struct dasd_device *memdev,
 326                                                 struct dasd_block *block,
 327                                                 struct request *req)
 328 {
 329         struct LO_fba_data *LO_data;
 330         struct dasd_ccw_req *cqr;
 331         struct ccw1 *ccw;
 332
 333         sector_t wz_stop = 0, d_stop = 0;
 334         sector_t first_rec, last_rec;
 335
 336         unsigned int blksize = block->bp_block;
 337         unsigned int blocks_per_page;
 338         int wz_count = 0;
 339         int d_count = 0;
 340         int cur_pos = 0; /* Current position within the extent */
 341         int count = 0;
 342         int cplength;
 343         int datasize;
 344         int nr_ccws;
 345
 346         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 347         last_rec =
 348                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 349         count = last_rec - first_rec + 1;
 350
 351         blocks_per_page = BLOCKS_PER_PAGE(blksize);
 352         nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
 353
 354         /* define extent + nr_ccws * locate record + nr_ccws * single CCW */
 355         cplength = 1 + 2 * nr_ccws;
 356         datasize = sizeof(struct DE_fba_data) +
 357                 nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
 358
 359         cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
 360         if (IS_ERR(cqr))
 361                 return cqr;
 362
 363         ccw = cqr->cpaddr;
 364
 365         define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count);
 366         LO_data = cqr->data + sizeof(struct DE_fba_data);
 367
 368         /* First part is not aligned. Calculate range to write zeroes. */
 369         if (first_rec % blocks_per_page != 0) {
 370                 wz_stop = first_rec + blocks_per_page -
 371                         (first_rec % blocks_per_page) - 1;
 372                 if (wz_stop > last_rec)
 373                         wz_stop = last_rec;
 374                 wz_count = wz_stop - first_rec + 1;
 375
 376                 ccw[-1].flags |= CCW_FLAG_CC;
 377                 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
 378
 379                 ccw[-1].flags |= CCW_FLAG_CC;
 380                 ccw_write_zero(ccw++, wz_count * blksize);
 381
 382                 cur_pos = wz_count;
 383         }
 384
 385         /* We can do proper discard when we've got at least blocks_per_page blocks. */
 386         if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
 387                 /* is last record at page boundary? */
 388                 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
 389                         d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
 390                                              blocks_per_page);
 391                 else
 392                         d_stop = last_rec;
 393
 394                 d_count = d_stop - (first_rec + cur_pos) + 1;
 395
 396                 ccw[-1].flags |= CCW_FLAG_CC;
 397                 locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count);
 398
 399                 ccw[-1].flags |= CCW_FLAG_CC;
 400                 ccw_write_no_data(ccw++);
 401
 402                 cur_pos += d_count;
 403         }
 404
 405         /* We might still have some bits left which need to be zeroed. */
 406         if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) {
 407                 if (d_stop != 0)
 408                         wz_count = last_rec - d_stop;
 409                 else if (wz_stop != 0)
 410                         wz_count = last_rec - wz_stop;
 411                 else
 412                         wz_count = count;
 413
 414                 ccw[-1].flags |= CCW_FLAG_CC;
 415                 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
 416
 417                 ccw[-1].flags |= CCW_FLAG_CC;
 418                 ccw_write_zero(ccw++, wz_count * blksize);
 419         }
 420
 421         if (blk_noretry_request(req) ||
 422             block->base->features & DASD_FEATURE_FAILFAST)
 423                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 424
 425         cqr->startdev = memdev;
 426         cqr->memdev = memdev;
 427         cqr->block = block;
 428         cqr->expires = memdev->default_expires * HZ;    /* default 5 minutes */
 429         cqr->retries = memdev->default_retries;
 430         cqr->buildclk = get_tod_clock();
 431         cqr->status = DASD_CQR_FILLED;
 432
 433         return cqr;
 434 }
 435
 436 static struct dasd_ccw_req *dasd_fba_build_cp_regular(
 437                                                 struct dasd_device *memdev,
 438                                                 struct dasd_block *block,
 439                                                 struct request *req)
 440 {
 441         struct dasd_fba_private *private = block->base->private;
 442         unsigned long *idaws;
 443         struct LO_fba_data *LO_data;
 444         struct dasd_ccw_req *cqr;
 445         struct ccw1 *ccw;
 446         struct req_iterator iter;
 447         struct bio_vec bv;
 448         char *dst;
 449         int count, cidaw, cplength, datasize;
 450         sector_t recid, first_rec, last_rec;
 451         unsigned int blksize, off;
 452         unsigned char cmd;
 453
 454         if (rq_data_dir(req) == READ) {
 455                 cmd = DASD_FBA_CCW_READ;
 456         } else if (rq_data_dir(req) == WRITE) {
 457                 cmd = DASD_FBA_CCW_WRITE;
 458         } else
 459                 return ERR_PTR(-EINVAL);
 460         blksize = block->bp_block;
 461         /* Calculate record id of first and last block. */
 462         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 463         last_rec =
 464                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 465         /* Check struct bio and count the number of blocks for the request. */
 466         count = 0;
 467         cidaw = 0;
 468         rq_for_each_segment(bv, req, iter) {
 469                 if (bv.bv_len & (blksize - 1))
 470                         /* Fba can only do full blocks. */
 471                         return ERR_PTR(-EINVAL);
 472                 count += bv.bv_len >> (block->s2b_shift + 9);
 473                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
 474                         cidaw += bv.bv_len / blksize;
 475         }
 476         /* Paranoia. */
 477         if (count != last_rec - first_rec + 1)
 478                 return ERR_PTR(-EINVAL);
 479         /* 1x define extent + 1x locate record + number of blocks */
 480         cplength = 2 + count;
 481         /* 1x define extent + 1x locate record */
 482         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 483                 cidaw * sizeof(unsigned long);
 484         /*
 485          * Find out number of additional locate record ccws if the device
 486          * can't do data chaining.
 487          */
 488         if (private->rdc_data.mode.bits.data_chain == 0) {
 489                 cplength += count - 1;
 490                 datasize += (count - 1)*sizeof(struct LO_fba_data);
 491         }
 492         /* Allocate the ccw request. */
 493         cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
 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  * max_blocks is dependent on the amount of storage that is available
 772  * in the static io buffer for each device. Currently each device has
 773  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 774  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 775  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 776  * addition we have one define extent ccw + 16 bytes of data and a
 777  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
 778  * That makes:
 779  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
 780  * We want to fit two into the available memory so that we can immediately
 781  * start the next request if one finishes off. That makes 100.1 blocks
 782  * for one request. Give a little safety and the result is 96.
 783  */
 784 static struct dasd_discipline dasd_fba_discipline = {
 785         .owner = THIS_MODULE,
 786         .name = "FBA ",
 787         .ebcname = "FBA ",
 788         .max_blocks = 96,
 789         .check_device = dasd_fba_check_characteristics,
 790         .do_analysis = dasd_fba_do_analysis,
 791         .verify_path = dasd_generic_verify_path,
 792         .fill_geometry = dasd_fba_fill_geometry,
 793         .start_IO = dasd_start_IO,
 794         .term_IO = dasd_term_IO,
 795         .handle_terminated_request = dasd_fba_handle_terminated_request,
 796         .erp_action = dasd_fba_erp_action,
 797         .erp_postaction = dasd_fba_erp_postaction,
 798         .check_for_device_change = dasd_fba_check_for_device_change,
 799         .build_cp = dasd_fba_build_cp,
 800         .free_cp = dasd_fba_free_cp,
 801         .dump_sense = dasd_fba_dump_sense,
 802         .dump_sense_dbf = dasd_fba_dump_sense_dbf,
 803         .fill_info = dasd_fba_fill_info,
 804 };
 805
 806 static int __init
 807 dasd_fba_init(void)
 808 {
 809         int ret;
 810
 811         ASCEBC(dasd_fba_discipline.ebcname, 4);
 812         ret = ccw_driver_register(&dasd_fba_driver);
 813         if (!ret)
 814                 wait_for_device_probe();
 815
 816         return ret;
 817 }
 818
 819 static void __exit
 820 dasd_fba_cleanup(void)
 821 {
 822         ccw_driver_unregister(&dasd_fba_driver);
 823 }
 824
 825 module_init(dasd_fba_init);
 826 module_exit(dasd_fba_cleanup);