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 40MODULE_LICENSE("GPL"); 41 42static struct dasd_discipline dasd_fba_discipline; 43static void *dasd_fba_zero_page; 44 45struct dasd_fba_private { 46 struct dasd_fba_characteristics rdc_data; 47}; 48 49static 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 55MODULE_DEVICE_TABLE(ccw, dasd_fba_ids); 56 57static struct ccw_driver dasd_fba_driver; /* see below */ 58static int 59dasd_fba_probe(struct ccw_device *cdev) 60{ 61 return dasd_generic_probe(cdev, &dasd_fba_discipline); 62} 63 64static int 65dasd_fba_set_online(struct ccw_device *cdev) 66{ 67 return dasd_generic_set_online(cdev, &dasd_fba_discipline); 68} 69 70static 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 .freeze = dasd_generic_pm_freeze, 83 .thaw = dasd_generic_restore_device, 84 .restore = dasd_generic_restore_device, 85 .int_class = IRQIO_DAS, 86}; 87 88static void 89define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw, 90 int blksize, int beg, int nr) 91{ 92 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT; 93 ccw->flags = 0; 94 ccw->count = 16; 95 ccw->cda = (__u32) __pa(data); 96 memset(data, 0, sizeof (struct DE_fba_data)); 97 if (rw == WRITE) 98 (data->mask).perm = 0x0; 99 else if (rw == READ) 100 (data->mask).perm = 0x1; 101 else 102 data->mask.perm = 0x2; 103 data->blk_size = blksize; 104 data->ext_loc = beg; 105 data->ext_end = nr - 1; 106} 107 108static void 109locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw, 110 int block_nr, int block_ct) 111{ 112 ccw->cmd_code = DASD_FBA_CCW_LOCATE; 113 ccw->flags = 0; 114 ccw->count = 8; 115 ccw->cda = (__u32) __pa(data); 116 memset(data, 0, sizeof (struct LO_fba_data)); 117 if (rw == WRITE) 118 data->operation.cmd = 0x5; 119 else if (rw == READ) 120 data->operation.cmd = 0x6; 121 else 122 data->operation.cmd = 0x8; 123 data->blk_nr = block_nr; 124 data->blk_ct = block_ct; 125} 126 127static int 128dasd_fba_check_characteristics(struct dasd_device *device) 129{ 130 struct dasd_fba_private *private = device->private; 131 struct ccw_device *cdev = device->cdev; 132 struct dasd_block *block; 133 int readonly, rc; 134 135 if (!private) { 136 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); 137 if (!private) { 138 dev_warn(&device->cdev->dev, 139 "Allocating memory for private DASD " 140 "data failed\n"); 141 return -ENOMEM; 142 } 143 device->private = private; 144 } else { 145 memset(private, 0, sizeof(*private)); 146 } 147 block = dasd_alloc_block(); 148 if (IS_ERR(block)) { 149 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate " 150 "dasd block structure"); 151 device->private = NULL; 152 kfree(private); 153 return PTR_ERR(block); 154 } 155 device->block = block; 156 block->base = device; 157 158 /* Read Device Characteristics */ 159 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC, 160 &private->rdc_data, 32); 161 if (rc) { 162 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device " 163 "characteristics returned error %d", rc); 164 device->block = NULL; 165 dasd_free_block(block); 166 device->private = NULL; 167 kfree(private); 168 return rc; 169 } 170 171 device->default_expires = DASD_EXPIRES; 172 device->default_retries = FBA_DEFAULT_RETRIES; 173 dasd_path_set_opm(device, LPM_ANYPATH); 174 175 readonly = dasd_device_is_ro(device); 176 if (readonly) 177 set_bit(DASD_FLAG_DEVICE_RO, &device->flags); 178 179 /* FBA supports discard, set the according feature bit */ 180 dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1); 181 182 dev_info(&device->cdev->dev, 183 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB " 184 "and %d B/blk%s\n", 185 cdev->id.dev_type, 186 cdev->id.dev_model, 187 cdev->id.cu_type, 188 cdev->id.cu_model, 189 ((private->rdc_data.blk_bdsa * 190 (private->rdc_data.blk_size >> 9)) >> 11), 191 private->rdc_data.blk_size, 192 readonly ? ", read-only device" : ""); 193 return 0; 194} 195 196static int dasd_fba_do_analysis(struct dasd_block *block) 197{ 198 struct dasd_fba_private *private = block->base->private; 199 int sb, rc; 200 201 rc = dasd_check_blocksize(private->rdc_data.blk_size); 202 if (rc) { 203 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d", 204 private->rdc_data.blk_size); 205 return rc; 206 } 207 block->blocks = private->rdc_data.blk_bdsa; 208 block->bp_block = private->rdc_data.blk_size; 209 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 210 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) 211 block->s2b_shift++; 212 return 0; 213} 214 215static int dasd_fba_fill_geometry(struct dasd_block *block, 216 struct hd_geometry *geo) 217{ 218 if (dasd_check_blocksize(block->bp_block) != 0) 219 return -EINVAL; 220 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 221 geo->heads = 16; 222 geo->sectors = 128 >> block->s2b_shift; 223 return 0; 224} 225 226static dasd_erp_fn_t 227dasd_fba_erp_action(struct dasd_ccw_req * cqr) 228{ 229 return dasd_default_erp_action; 230} 231 232static dasd_erp_fn_t 233dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) 234{ 235 if (cqr->function == dasd_default_erp_action) 236 return dasd_default_erp_postaction; 237 238 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p", 239 cqr->function); 240 return NULL; 241} 242 243static void dasd_fba_check_for_device_change(struct dasd_device *device, 244 struct dasd_ccw_req *cqr, 245 struct irb *irb) 246{ 247 char mask; 248 249 /* first of all check for state change pending interrupt */ 250 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; 251 if ((irb->scsw.cmd.dstat & mask) == mask) 252 dasd_generic_handle_state_change(device); 253}; 254 255 256/* 257 * Builds a CCW with no data payload 258 */ 259static void ccw_write_no_data(struct ccw1 *ccw) 260{ 261 ccw->cmd_code = DASD_FBA_CCW_WRITE; 262 ccw->flags |= CCW_FLAG_SLI; 263 ccw->count = 0; 264} 265 266/* 267 * Builds a CCW that writes only zeroes. 268 */ 269static void ccw_write_zero(struct ccw1 *ccw, int count) 270{ 271 ccw->cmd_code = DASD_FBA_CCW_WRITE; 272 ccw->flags |= CCW_FLAG_SLI; 273 ccw->count = count; 274 ccw->cda = (__u32) (addr_t) dasd_fba_zero_page; 275} 276 277/* 278 * Helper function to count the amount of necessary CCWs within a given range 279 * with 4k alignment and command chaining in mind. 280 */ 281static int count_ccws(sector_t first_rec, sector_t last_rec, 282 unsigned int blocks_per_page) 283{ 284 sector_t wz_stop = 0, d_stop = 0; 285 int cur_pos = 0; 286 int count = 0; 287 288 if (first_rec % blocks_per_page != 0) { 289 wz_stop = first_rec + blocks_per_page - 290 (first_rec % blocks_per_page) - 1; 291 if (wz_stop > last_rec) 292 wz_stop = last_rec; 293 cur_pos = wz_stop - first_rec + 1; 294 count++; 295 } 296 297 if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) { 298 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0) 299 d_stop = last_rec - ((last_rec - blocks_per_page + 1) % 300 blocks_per_page); 301 else 302 d_stop = last_rec; 303 304 cur_pos += d_stop - (first_rec + cur_pos) + 1; 305 count++; 306 } 307 308 if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) 309 count++; 310 311 return count; 312} 313 314/* 315 * This function builds a CCW request for block layer discard requests. 316 * Each page in the z/VM hypervisor that represents certain records of an FBA 317 * device will be padded with zeros. This is a special behaviour of the WRITE 318 * command which is triggered when no data payload is added to the CCW. 319 * 320 * Note: Due to issues in some z/VM versions, we can't fully utilise this 321 * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to 322 * work around those issues and write actual zeroes to the unaligned parts in 323 * the request. This workaround might be removed in the future. 324 */ 325static struct dasd_ccw_req *dasd_fba_build_cp_discard( 326 struct dasd_device *memdev, 327 struct dasd_block *block, 328 struct request *req) 329{ 330 struct LO_fba_data *LO_data; 331 struct dasd_ccw_req *cqr; 332 struct ccw1 *ccw; 333 334 sector_t wz_stop = 0, d_stop = 0; 335 sector_t first_rec, last_rec; 336 337 unsigned int blksize = block->bp_block; 338 unsigned int blocks_per_page; 339 int wz_count = 0; 340 int d_count = 0; 341 int cur_pos = 0; /* Current position within the extent */ 342 int count = 0; 343 int cplength; 344 int datasize; 345 int nr_ccws; 346 347 first_rec = blk_rq_pos(req) >> block->s2b_shift; 348 last_rec = 349 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 350 count = last_rec - first_rec + 1; 351 352 blocks_per_page = BLOCKS_PER_PAGE(blksize); 353 nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page); 354 355 /* define extent + nr_ccws * locate record + nr_ccws * single CCW */ 356 cplength = 1 + 2 * nr_ccws; 357 datasize = sizeof(struct DE_fba_data) + 358 nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1)); 359 360 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev, 361 blk_mq_rq_to_pdu(req)); 362 if (IS_ERR(cqr)) 363 return cqr; 364 365 ccw = cqr->cpaddr; 366 367 define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count); 368 LO_data = cqr->data + sizeof(struct DE_fba_data); 369 370 /* First part is not aligned. Calculate range to write zeroes. */ 371 if (first_rec % blocks_per_page != 0) { 372 wz_stop = first_rec + blocks_per_page - 373 (first_rec % blocks_per_page) - 1; 374 if (wz_stop > last_rec) 375 wz_stop = last_rec; 376 wz_count = wz_stop - first_rec + 1; 377 378 ccw[-1].flags |= CCW_FLAG_CC; 379 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count); 380 381 ccw[-1].flags |= CCW_FLAG_CC; 382 ccw_write_zero(ccw++, wz_count * blksize); 383 384 cur_pos = wz_count; 385 } 386 387 /* We can do proper discard when we've got at least blocks_per_page blocks. */ 388 if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) { 389 /* is last record at page boundary? */ 390 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0) 391 d_stop = last_rec - ((last_rec - blocks_per_page + 1) % 392 blocks_per_page); 393 else 394 d_stop = last_rec; 395 396 d_count = d_stop - (first_rec + cur_pos) + 1; 397 398 ccw[-1].flags |= CCW_FLAG_CC; 399 locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count); 400 401 ccw[-1].flags |= CCW_FLAG_CC; 402 ccw_write_no_data(ccw++); 403 404 cur_pos += d_count; 405 } 406 407 /* We might still have some bits left which need to be zeroed. */ 408 if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) { 409 if (d_stop != 0) 410 wz_count = last_rec - d_stop; 411 else if (wz_stop != 0) 412 wz_count = last_rec - wz_stop; 413 else 414 wz_count = count; 415 416 ccw[-1].flags |= CCW_FLAG_CC; 417 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count); 418 419 ccw[-1].flags |= CCW_FLAG_CC; 420 ccw_write_zero(ccw++, wz_count * blksize); 421 } 422 423 if (blk_noretry_request(req) || 424 block->base->features & DASD_FEATURE_FAILFAST) 425 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 426 427 cqr->startdev = memdev; 428 cqr->memdev = memdev; 429 cqr->block = block; 430 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ 431 cqr->retries = memdev->default_retries; 432 cqr->buildclk = get_tod_clock(); 433 cqr->status = DASD_CQR_FILLED; 434 435 return cqr; 436} 437 438static struct dasd_ccw_req *dasd_fba_build_cp_regular( 439 struct dasd_device *memdev, 440 struct dasd_block *block, 441 struct request *req) 442{ 443 struct dasd_fba_private *private = block->base->private; 444 unsigned long *idaws; 445 struct LO_fba_data *LO_data; 446 struct dasd_ccw_req *cqr; 447 struct ccw1 *ccw; 448 struct req_iterator iter; 449 struct bio_vec bv; 450 char *dst; 451 int count, cidaw, cplength, datasize; 452 sector_t recid, first_rec, last_rec; 453 unsigned int blksize, off; 454 unsigned char cmd; 455 456 if (rq_data_dir(req) == READ) { 457 cmd = DASD_FBA_CCW_READ; 458 } else if (rq_data_dir(req) == WRITE) { 459 cmd = DASD_FBA_CCW_WRITE; 460 } else 461 return ERR_PTR(-EINVAL); 462 blksize = block->bp_block; 463 /* Calculate record id of first and last block. */ 464 first_rec = blk_rq_pos(req) >> block->s2b_shift; 465 last_rec = 466 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 467 /* Check struct bio and count the number of blocks for the request. */ 468 count = 0; 469 cidaw = 0; 470 rq_for_each_segment(bv, req, iter) { 471 if (bv.bv_len & (blksize - 1)) 472 /* Fba can only do full blocks. */ 473 return ERR_PTR(-EINVAL); 474 count += bv.bv_len >> (block->s2b_shift + 9); 475 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len)) 476 cidaw += bv.bv_len / blksize; 477 } 478 /* Paranoia. */ 479 if (count != last_rec - first_rec + 1) 480 return ERR_PTR(-EINVAL); 481 /* 1x define extent + 1x locate record + number of blocks */ 482 cplength = 2 + count; 483 /* 1x define extent + 1x locate record */ 484 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) + 485 cidaw * sizeof(unsigned long); 486 /* 487 * Find out number of additional locate record ccws if the device 488 * can't do data chaining. 489 */ 490 if (private->rdc_data.mode.bits.data_chain == 0) { 491 cplength += count - 1; 492 datasize += (count - 1)*sizeof(struct LO_fba_data); 493 } 494 /* Allocate the ccw request. */ 495 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev, 496 blk_mq_rq_to_pdu(req)); 497 if (IS_ERR(cqr)) 498 return cqr; 499 ccw = cqr->cpaddr; 500 /* First ccw is define extent. */ 501 define_extent(ccw++, cqr->data, rq_data_dir(req), 502 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req)); 503 /* Build locate_record + read/write ccws. */ 504 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data)); 505 LO_data = (struct LO_fba_data *) (idaws + cidaw); 506 /* Locate record for all blocks for smart devices. */ 507 if (private->rdc_data.mode.bits.data_chain != 0) { 508 ccw[-1].flags |= CCW_FLAG_CC; 509 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count); 510 } 511 recid = first_rec; 512 rq_for_each_segment(bv, req, iter) { 513 dst = page_address(bv.bv_page) + bv.bv_offset; 514 if (dasd_page_cache) { 515 char *copy = kmem_cache_alloc(dasd_page_cache, 516 GFP_DMA | __GFP_NOWARN); 517 if (copy && rq_data_dir(req) == WRITE) 518 memcpy(copy + bv.bv_offset, dst, bv.bv_len); 519 if (copy) 520 dst = copy + bv.bv_offset; 521 } 522 for (off = 0; off < bv.bv_len; off += blksize) { 523 /* Locate record for stupid devices. */ 524 if (private->rdc_data.mode.bits.data_chain == 0) { 525 ccw[-1].flags |= CCW_FLAG_CC; 526 locate_record(ccw, LO_data++, 527 rq_data_dir(req), 528 recid - first_rec, 1); 529 ccw->flags = CCW_FLAG_CC; 530 ccw++; 531 } else { 532 if (recid > first_rec) 533 ccw[-1].flags |= CCW_FLAG_DC; 534 else 535 ccw[-1].flags |= CCW_FLAG_CC; 536 } 537 ccw->cmd_code = cmd; 538 ccw->count = block->bp_block; 539 if (idal_is_needed(dst, blksize)) { 540 ccw->cda = (__u32)(addr_t) idaws; 541 ccw->flags = CCW_FLAG_IDA; 542 idaws = idal_create_words(idaws, dst, blksize); 543 } else { 544 ccw->cda = (__u32)(addr_t) dst; 545 ccw->flags = 0; 546 } 547 ccw++; 548 dst += blksize; 549 recid++; 550 } 551 } 552 if (blk_noretry_request(req) || 553 block->base->features & DASD_FEATURE_FAILFAST) 554 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 555 cqr->startdev = memdev; 556 cqr->memdev = memdev; 557 cqr->block = block; 558 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ 559 cqr->retries = memdev->default_retries; 560 cqr->buildclk = get_tod_clock(); 561 cqr->status = DASD_CQR_FILLED; 562 return cqr; 563} 564 565static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev, 566 struct dasd_block *block, 567 struct request *req) 568{ 569 if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES) 570 return dasd_fba_build_cp_discard(memdev, block, req); 571 else 572 return dasd_fba_build_cp_regular(memdev, block, req); 573} 574 575static int 576dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req) 577{ 578 struct dasd_fba_private *private = cqr->block->base->private; 579 struct ccw1 *ccw; 580 struct req_iterator iter; 581 struct bio_vec bv; 582 char *dst, *cda; 583 unsigned int blksize, off; 584 int status; 585 586 if (!dasd_page_cache) 587 goto out; 588 blksize = cqr->block->bp_block; 589 ccw = cqr->cpaddr; 590 /* Skip over define extent & locate record. */ 591 ccw++; 592 if (private->rdc_data.mode.bits.data_chain != 0) 593 ccw++; 594 rq_for_each_segment(bv, req, iter) { 595 dst = page_address(bv.bv_page) + bv.bv_offset; 596 for (off = 0; off < bv.bv_len; off += blksize) { 597 /* Skip locate record. */ 598 if (private->rdc_data.mode.bits.data_chain == 0) 599 ccw++; 600 if (dst) { 601 if (ccw->flags & CCW_FLAG_IDA) 602 cda = *((char **)((addr_t) ccw->cda)); 603 else 604 cda = (char *)((addr_t) ccw->cda); 605 if (dst != cda) { 606 if (rq_data_dir(req) == READ) 607 memcpy(dst, cda, bv.bv_len); 608 kmem_cache_free(dasd_page_cache, 609 (void *)((addr_t)cda & PAGE_MASK)); 610 } 611 dst = NULL; 612 } 613 ccw++; 614 } 615 } 616out: 617 status = cqr->status == DASD_CQR_DONE; 618 dasd_sfree_request(cqr, cqr->memdev); 619 return status; 620} 621 622static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr) 623{ 624 if (cqr->retries < 0) 625 cqr->status = DASD_CQR_FAILED; 626 else 627 cqr->status = DASD_CQR_FILLED; 628}; 629 630static int 631dasd_fba_fill_info(struct dasd_device * device, 632 struct dasd_information2_t * info) 633{ 634 struct dasd_fba_private *private = device->private; 635 636 info->label_block = 1; 637 info->FBA_layout = 1; 638 info->format = DASD_FORMAT_LDL; 639 info->characteristics_size = sizeof(private->rdc_data); 640 memcpy(info->characteristics, &private->rdc_data, 641 sizeof(private->rdc_data)); 642 info->confdata_size = 0; 643 return 0; 644} 645 646static void 647dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb, 648 char *reason) 649{ 650 u64 *sense; 651 652 sense = (u64 *) dasd_get_sense(irb); 653 if (sense) { 654 DBF_DEV_EVENT(DBF_EMERG, device, 655 "%s: %s %02x%02x%02x %016llx %016llx %016llx " 656 "%016llx", reason, 657 scsw_is_tm(&irb->scsw) ? "t" : "c", 658 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw), 659 scsw_dstat(&irb->scsw), sense[0], sense[1], 660 sense[2], sense[3]); 661 } else { 662 DBF_DEV_EVENT(DBF_EMERG, device, "%s", 663 "SORRY - NO VALID SENSE AVAILABLE\n"); 664 } 665} 666 667 668static void 669dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 670 struct irb *irb) 671{ 672 char *page; 673 struct ccw1 *act, *end, *last; 674 int len, sl, sct, count; 675 676 page = (char *) get_zeroed_page(GFP_ATOMIC); 677 if (page == NULL) { 678 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 679 "No memory to dump sense data"); 680 return; 681 } 682 len = sprintf(page, PRINTK_HEADER 683 " I/O status report for device %s:\n", 684 dev_name(&device->cdev->dev)); 685 len += sprintf(page + len, PRINTK_HEADER 686 " in req: %p CS: 0x%02X DS: 0x%02X\n", req, 687 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat); 688 len += sprintf(page + len, PRINTK_HEADER 689 " device %s: Failing CCW: %p\n", 690 dev_name(&device->cdev->dev), 691 (void *) (addr_t) irb->scsw.cmd.cpa); 692 if (irb->esw.esw0.erw.cons) { 693 for (sl = 0; sl < 4; sl++) { 694 len += sprintf(page + len, PRINTK_HEADER 695 " Sense(hex) %2d-%2d:", 696 (8 * sl), ((8 * sl) + 7)); 697 698 for (sct = 0; sct < 8; sct++) { 699 len += sprintf(page + len, " %02x", 700 irb->ecw[8 * sl + sct]); 701 } 702 len += sprintf(page + len, "\n"); 703 } 704 } else { 705 len += sprintf(page + len, PRINTK_HEADER 706 " SORRY - NO VALID SENSE AVAILABLE\n"); 707 } 708 printk(KERN_ERR "%s", page); 709 710 /* dump the Channel Program */ 711 /* print first CCWs (maximum 8) */ 712 act = req->cpaddr; 713 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); 714 end = min(act + 8, last); 715 len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req); 716 while (act <= end) { 717 len += sprintf(page + len, PRINTK_HEADER 718 " CCW %p: %08X %08X DAT:", 719 act, ((int *) act)[0], ((int *) act)[1]); 720 for (count = 0; count < 32 && count < act->count; 721 count += sizeof(int)) 722 len += sprintf(page + len, " %08X", 723 ((int *) (addr_t) act->cda) 724 [(count>>2)]); 725 len += sprintf(page + len, "\n"); 726 act++; 727 } 728 printk(KERN_ERR "%s", page); 729 730 731 /* print failing CCW area */ 732 len = 0; 733 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { 734 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; 735 len += sprintf(page + len, PRINTK_HEADER "......\n"); 736 } 737 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); 738 while (act <= end) { 739 len += sprintf(page + len, PRINTK_HEADER 740 " CCW %p: %08X %08X DAT:", 741 act, ((int *) act)[0], ((int *) act)[1]); 742 for (count = 0; count < 32 && count < act->count; 743 count += sizeof(int)) 744 len += sprintf(page + len, " %08X", 745 ((int *) (addr_t) act->cda) 746 [(count>>2)]); 747 len += sprintf(page + len, "\n"); 748 act++; 749 } 750 751 /* print last CCWs */ 752 if (act < last - 2) { 753 act = last - 2; 754 len += sprintf(page + len, PRINTK_HEADER "......\n"); 755 } 756 while (act <= last) { 757 len += sprintf(page + len, PRINTK_HEADER 758 " CCW %p: %08X %08X DAT:", 759 act, ((int *) act)[0], ((int *) act)[1]); 760 for (count = 0; count < 32 && count < act->count; 761 count += sizeof(int)) 762 len += sprintf(page + len, " %08X", 763 ((int *) (addr_t) act->cda) 764 [(count>>2)]); 765 len += sprintf(page + len, "\n"); 766 act++; 767 } 768 if (len > 0) 769 printk(KERN_ERR "%s", page); 770 free_page((unsigned long) page); 771} 772 773/* 774 * Initialize block layer request queue. 775 */ 776static void dasd_fba_setup_blk_queue(struct dasd_block *block) 777{ 778 unsigned int logical_block_size = block->bp_block; 779 struct request_queue *q = block->request_queue; 780 unsigned int max_bytes, max_discard_sectors; 781 int max; 782 783 max = DASD_FBA_MAX_BLOCKS << block->s2b_shift; 784 blk_queue_flag_set(QUEUE_FLAG_NONROT, q); 785 q->limits.max_dev_sectors = max; 786 blk_queue_logical_block_size(q, logical_block_size); 787 blk_queue_max_hw_sectors(q, max); 788 blk_queue_max_segments(q, USHRT_MAX); 789 /* With page sized segments each segment can be translated into one idaw/tidaw */ 790 blk_queue_max_segment_size(q, PAGE_SIZE); 791 blk_queue_segment_boundary(q, PAGE_SIZE - 1); 792 793 q->limits.discard_granularity = logical_block_size; 794 q->limits.discard_alignment = PAGE_SIZE; 795 796 /* Calculate max_discard_sectors and make it PAGE aligned */ 797 max_bytes = USHRT_MAX * logical_block_size; 798 max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE); 799 max_discard_sectors = max_bytes / logical_block_size; 800 801 blk_queue_max_discard_sectors(q, max_discard_sectors); 802 blk_queue_max_write_zeroes_sectors(q, max_discard_sectors); 803 blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); 804} 805 806static int dasd_fba_pe_handler(struct dasd_device *device, __u8 tbvpm) 807{ 808 return dasd_generic_verify_path(device, tbvpm); 809} 810 811static struct dasd_discipline dasd_fba_discipline = { 812 .owner = THIS_MODULE, 813 .name = "FBA ", 814 .ebcname = "FBA ", 815 .check_device = dasd_fba_check_characteristics, 816 .do_analysis = dasd_fba_do_analysis, 817 .pe_handler = dasd_fba_pe_handler, 818 .setup_blk_queue = dasd_fba_setup_blk_queue, 819 .fill_geometry = dasd_fba_fill_geometry, 820 .start_IO = dasd_start_IO, 821 .term_IO = dasd_term_IO, 822 .handle_terminated_request = dasd_fba_handle_terminated_request, 823 .erp_action = dasd_fba_erp_action, 824 .erp_postaction = dasd_fba_erp_postaction, 825 .check_for_device_change = dasd_fba_check_for_device_change, 826 .build_cp = dasd_fba_build_cp, 827 .free_cp = dasd_fba_free_cp, 828 .dump_sense = dasd_fba_dump_sense, 829 .dump_sense_dbf = dasd_fba_dump_sense_dbf, 830 .fill_info = dasd_fba_fill_info, 831}; 832 833static int __init 834dasd_fba_init(void) 835{ 836 int ret; 837 838 ASCEBC(dasd_fba_discipline.ebcname, 4); 839 840 dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 841 if (!dasd_fba_zero_page) 842 return -ENOMEM; 843 844 ret = ccw_driver_register(&dasd_fba_driver); 845 if (!ret) 846 wait_for_device_probe(); 847 848 return ret; 849} 850 851static void __exit 852dasd_fba_cleanup(void) 853{ 854 ccw_driver_unregister(&dasd_fba_driver); 855 free_page((unsigned long)dasd_fba_zero_page); 856} 857 858module_init(dasd_fba_init); 859module_exit(dasd_fba_cleanup); 860