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); 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); 852