1/* 2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 3 * Bugreports.to..: <Linux390@de.ibm.com> 4 * Copyright IBM Corp. 1999, 2009 5 */ 6 7#define KMSG_COMPONENT "dasd-fba" 8 9#include <linux/stddef.h> 10#include <linux/kernel.h> 11#include <asm/debug.h> 12 13#include <linux/slab.h> 14#include <linux/hdreg.h> /* HDIO_GETGEO */ 15#include <linux/bio.h> 16#include <linux/module.h> 17#include <linux/init.h> 18 19#include <asm/idals.h> 20#include <asm/ebcdic.h> 21#include <asm/io.h> 22#include <asm/ccwdev.h> 23 24#include "dasd_int.h" 25#include "dasd_fba.h" 26 27#ifdef PRINTK_HEADER 28#undef PRINTK_HEADER 29#endif /* PRINTK_HEADER */ 30#define PRINTK_HEADER "dasd(fba):" 31 32#define FBA_DEFAULT_RETRIES 32 33 34#define DASD_FBA_CCW_WRITE 0x41 35#define DASD_FBA_CCW_READ 0x42 36#define DASD_FBA_CCW_LOCATE 0x43 37#define DASD_FBA_CCW_DEFINE_EXTENT 0x63 38 39MODULE_LICENSE("GPL"); 40 41static struct dasd_discipline dasd_fba_discipline; 42 43struct dasd_fba_private { 44 struct dasd_fba_characteristics rdc_data; 45}; 46 47static struct ccw_device_id dasd_fba_ids[] = { 48 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1}, 49 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2}, 50 { /* end of list */ }, 51}; 52 53MODULE_DEVICE_TABLE(ccw, dasd_fba_ids); 54 55static struct ccw_driver dasd_fba_driver; /* see below */ 56static int 57dasd_fba_probe(struct ccw_device *cdev) 58{ 59 return dasd_generic_probe(cdev, &dasd_fba_discipline); 60} 61 62static int 63dasd_fba_set_online(struct ccw_device *cdev) 64{ 65 return dasd_generic_set_online(cdev, &dasd_fba_discipline); 66} 67 68static struct ccw_driver dasd_fba_driver = { 69 .driver = { 70 .name = "dasd-fba", 71 .owner = THIS_MODULE, 72 }, 73 .ids = dasd_fba_ids, 74 .probe = dasd_fba_probe, 75 .remove = dasd_generic_remove, 76 .set_offline = dasd_generic_set_offline, 77 .set_online = dasd_fba_set_online, 78 .notify = dasd_generic_notify, 79 .path_event = dasd_generic_path_event, 80 .freeze = dasd_generic_pm_freeze, 81 .thaw = dasd_generic_restore_device, 82 .restore = dasd_generic_restore_device, 83 .int_class = IRQIO_DAS, 84}; 85 86static void 87define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw, 88 int blksize, int beg, int nr) 89{ 90 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT; 91 ccw->flags = 0; 92 ccw->count = 16; 93 ccw->cda = (__u32) __pa(data); 94 memset(data, 0, sizeof (struct DE_fba_data)); 95 if (rw == WRITE) 96 (data->mask).perm = 0x0; 97 else if (rw == READ) 98 (data->mask).perm = 0x1; 99 else 100 data->mask.perm = 0x2; 101 data->blk_size = blksize; 102 data->ext_loc = beg; 103 data->ext_end = nr - 1; 104} 105 106static void 107locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw, 108 int block_nr, int block_ct) 109{ 110 ccw->cmd_code = DASD_FBA_CCW_LOCATE; 111 ccw->flags = 0; 112 ccw->count = 8; 113 ccw->cda = (__u32) __pa(data); 114 memset(data, 0, sizeof (struct LO_fba_data)); 115 if (rw == WRITE) 116 data->operation.cmd = 0x5; 117 else if (rw == READ) 118 data->operation.cmd = 0x6; 119 else 120 data->operation.cmd = 0x8; 121 data->blk_nr = block_nr; 122 data->blk_ct = block_ct; 123} 124 125static int 126dasd_fba_check_characteristics(struct dasd_device *device) 127{ 128 struct dasd_block *block; 129 struct dasd_fba_private *private; 130 struct ccw_device *cdev = device->cdev; 131 int rc; 132 int readonly; 133 134 private = (struct dasd_fba_private *) device->private; 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 = (void *) 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 device->path_data.opm = LPM_ANYPATH; 174 175 readonly = dasd_device_is_ro(device); 176 if (readonly) 177 set_bit(DASD_FLAG_DEVICE_RO, &device->flags); 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 193static int dasd_fba_do_analysis(struct dasd_block *block) 194{ 195 struct dasd_fba_private *private; 196 int sb, rc; 197 198 private = (struct dasd_fba_private *) block->base->private; 199 rc = dasd_check_blocksize(private->rdc_data.blk_size); 200 if (rc) { 201 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d", 202 private->rdc_data.blk_size); 203 return rc; 204 } 205 block->blocks = private->rdc_data.blk_bdsa; 206 block->bp_block = private->rdc_data.blk_size; 207 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 208 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) 209 block->s2b_shift++; 210 return 0; 211} 212 213static int dasd_fba_fill_geometry(struct dasd_block *block, 214 struct hd_geometry *geo) 215{ 216 if (dasd_check_blocksize(block->bp_block) != 0) 217 return -EINVAL; 218 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 219 geo->heads = 16; 220 geo->sectors = 128 >> block->s2b_shift; 221 return 0; 222} 223 224static dasd_erp_fn_t 225dasd_fba_erp_action(struct dasd_ccw_req * cqr) 226{ 227 return dasd_default_erp_action; 228} 229 230static dasd_erp_fn_t 231dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) 232{ 233 if (cqr->function == dasd_default_erp_action) 234 return dasd_default_erp_postaction; 235 236 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p", 237 cqr->function); 238 return NULL; 239} 240 241static void dasd_fba_check_for_device_change(struct dasd_device *device, 242 struct dasd_ccw_req *cqr, 243 struct irb *irb) 244{ 245 char mask; 246 247 /* first of all check for state change pending interrupt */ 248 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; 249 if ((irb->scsw.cmd.dstat & mask) == mask) 250 dasd_generic_handle_state_change(device); 251}; 252 253static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev, 254 struct dasd_block *block, 255 struct request *req) 256{ 257 struct dasd_fba_private *private; 258 unsigned long *idaws; 259 struct LO_fba_data *LO_data; 260 struct dasd_ccw_req *cqr; 261 struct ccw1 *ccw; 262 struct req_iterator iter; 263 struct bio_vec bv; 264 char *dst; 265 int count, cidaw, cplength, datasize; 266 sector_t recid, first_rec, last_rec; 267 unsigned int blksize, off; 268 unsigned char cmd; 269 270 private = (struct dasd_fba_private *) block->base->private; 271 if (rq_data_dir(req) == READ) { 272 cmd = DASD_FBA_CCW_READ; 273 } else if (rq_data_dir(req) == WRITE) { 274 cmd = DASD_FBA_CCW_WRITE; 275 } else 276 return ERR_PTR(-EINVAL); 277 blksize = block->bp_block; 278 /* Calculate record id of first and last block. */ 279 first_rec = blk_rq_pos(req) >> block->s2b_shift; 280 last_rec = 281 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 282 /* Check struct bio and count the number of blocks for the request. */ 283 count = 0; 284 cidaw = 0; 285 rq_for_each_segment(bv, req, iter) { 286 if (bv.bv_len & (blksize - 1)) 287 /* Fba can only do full blocks. */ 288 return ERR_PTR(-EINVAL); 289 count += bv.bv_len >> (block->s2b_shift + 9); 290 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len)) 291 cidaw += bv.bv_len / blksize; 292 } 293 /* Paranoia. */ 294 if (count != last_rec - first_rec + 1) 295 return ERR_PTR(-EINVAL); 296 /* 1x define extent + 1x locate record + number of blocks */ 297 cplength = 2 + count; 298 /* 1x define extent + 1x locate record */ 299 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) + 300 cidaw * sizeof(unsigned long); 301 /* 302 * Find out number of additional locate record ccws if the device 303 * can't do data chaining. 304 */ 305 if (private->rdc_data.mode.bits.data_chain == 0) { 306 cplength += count - 1; 307 datasize += (count - 1)*sizeof(struct LO_fba_data); 308 } 309 /* Allocate the ccw request. */ 310 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev); 311 if (IS_ERR(cqr)) 312 return cqr; 313 ccw = cqr->cpaddr; 314 /* First ccw is define extent. */ 315 define_extent(ccw++, cqr->data, rq_data_dir(req), 316 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req)); 317 /* Build locate_record + read/write ccws. */ 318 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data)); 319 LO_data = (struct LO_fba_data *) (idaws + cidaw); 320 /* Locate record for all blocks for smart devices. */ 321 if (private->rdc_data.mode.bits.data_chain != 0) { 322 ccw[-1].flags |= CCW_FLAG_CC; 323 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count); 324 } 325 recid = first_rec; 326 rq_for_each_segment(bv, req, iter) { 327 dst = page_address(bv.bv_page) + bv.bv_offset; 328 if (dasd_page_cache) { 329 char *copy = kmem_cache_alloc(dasd_page_cache, 330 GFP_DMA | __GFP_NOWARN); 331 if (copy && rq_data_dir(req) == WRITE) 332 memcpy(copy + bv.bv_offset, dst, bv.bv_len); 333 if (copy) 334 dst = copy + bv.bv_offset; 335 } 336 for (off = 0; off < bv.bv_len; off += blksize) { 337 /* Locate record for stupid devices. */ 338 if (private->rdc_data.mode.bits.data_chain == 0) { 339 ccw[-1].flags |= CCW_FLAG_CC; 340 locate_record(ccw, LO_data++, 341 rq_data_dir(req), 342 recid - first_rec, 1); 343 ccw->flags = CCW_FLAG_CC; 344 ccw++; 345 } else { 346 if (recid > first_rec) 347 ccw[-1].flags |= CCW_FLAG_DC; 348 else 349 ccw[-1].flags |= CCW_FLAG_CC; 350 } 351 ccw->cmd_code = cmd; 352 ccw->count = block->bp_block; 353 if (idal_is_needed(dst, blksize)) { 354 ccw->cda = (__u32)(addr_t) idaws; 355 ccw->flags = CCW_FLAG_IDA; 356 idaws = idal_create_words(idaws, dst, blksize); 357 } else { 358 ccw->cda = (__u32)(addr_t) dst; 359 ccw->flags = 0; 360 } 361 ccw++; 362 dst += blksize; 363 recid++; 364 } 365 } 366 if (blk_noretry_request(req) || 367 block->base->features & DASD_FEATURE_FAILFAST) 368 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 369 cqr->startdev = memdev; 370 cqr->memdev = memdev; 371 cqr->block = block; 372 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ 373 cqr->retries = memdev->default_retries; 374 cqr->buildclk = get_tod_clock(); 375 cqr->status = DASD_CQR_FILLED; 376 return cqr; 377} 378 379static int 380dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req) 381{ 382 struct dasd_fba_private *private; 383 struct ccw1 *ccw; 384 struct req_iterator iter; 385 struct bio_vec bv; 386 char *dst, *cda; 387 unsigned int blksize, off; 388 int status; 389 390 if (!dasd_page_cache) 391 goto out; 392 private = (struct dasd_fba_private *) cqr->block->base->private; 393 blksize = cqr->block->bp_block; 394 ccw = cqr->cpaddr; 395 /* Skip over define extent & locate record. */ 396 ccw++; 397 if (private->rdc_data.mode.bits.data_chain != 0) 398 ccw++; 399 rq_for_each_segment(bv, req, iter) { 400 dst = page_address(bv.bv_page) + bv.bv_offset; 401 for (off = 0; off < bv.bv_len; off += blksize) { 402 /* Skip locate record. */ 403 if (private->rdc_data.mode.bits.data_chain == 0) 404 ccw++; 405 if (dst) { 406 if (ccw->flags & CCW_FLAG_IDA) 407 cda = *((char **)((addr_t) ccw->cda)); 408 else 409 cda = (char *)((addr_t) ccw->cda); 410 if (dst != cda) { 411 if (rq_data_dir(req) == READ) 412 memcpy(dst, cda, bv.bv_len); 413 kmem_cache_free(dasd_page_cache, 414 (void *)((addr_t)cda & PAGE_MASK)); 415 } 416 dst = NULL; 417 } 418 ccw++; 419 } 420 } 421out: 422 status = cqr->status == DASD_CQR_DONE; 423 dasd_sfree_request(cqr, cqr->memdev); 424 return status; 425} 426 427static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr) 428{ 429 if (cqr->retries < 0) 430 cqr->status = DASD_CQR_FAILED; 431 else 432 cqr->status = DASD_CQR_FILLED; 433}; 434 435static int 436dasd_fba_fill_info(struct dasd_device * device, 437 struct dasd_information2_t * info) 438{ 439 info->label_block = 1; 440 info->FBA_layout = 1; 441 info->format = DASD_FORMAT_LDL; 442 info->characteristics_size = sizeof(struct dasd_fba_characteristics); 443 memcpy(info->characteristics, 444 &((struct dasd_fba_private *) device->private)->rdc_data, 445 sizeof (struct dasd_fba_characteristics)); 446 info->confdata_size = 0; 447 return 0; 448} 449 450static void 451dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb, 452 char *reason) 453{ 454 u64 *sense; 455 456 sense = (u64 *) dasd_get_sense(irb); 457 if (sense) { 458 DBF_DEV_EVENT(DBF_EMERG, device, 459 "%s: %s %02x%02x%02x %016llx %016llx %016llx " 460 "%016llx", reason, 461 scsw_is_tm(&irb->scsw) ? "t" : "c", 462 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw), 463 scsw_dstat(&irb->scsw), sense[0], sense[1], 464 sense[2], sense[3]); 465 } else { 466 DBF_DEV_EVENT(DBF_EMERG, device, "%s", 467 "SORRY - NO VALID SENSE AVAILABLE\n"); 468 } 469} 470 471 472static void 473dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 474 struct irb *irb) 475{ 476 char *page; 477 struct ccw1 *act, *end, *last; 478 int len, sl, sct, count; 479 480 page = (char *) get_zeroed_page(GFP_ATOMIC); 481 if (page == NULL) { 482 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 483 "No memory to dump sense data"); 484 return; 485 } 486 len = sprintf(page, PRINTK_HEADER 487 " I/O status report for device %s:\n", 488 dev_name(&device->cdev->dev)); 489 len += sprintf(page + len, PRINTK_HEADER 490 " in req: %p CS: 0x%02X DS: 0x%02X\n", req, 491 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat); 492 len += sprintf(page + len, PRINTK_HEADER 493 " device %s: Failing CCW: %p\n", 494 dev_name(&device->cdev->dev), 495 (void *) (addr_t) irb->scsw.cmd.cpa); 496 if (irb->esw.esw0.erw.cons) { 497 for (sl = 0; sl < 4; sl++) { 498 len += sprintf(page + len, PRINTK_HEADER 499 " Sense(hex) %2d-%2d:", 500 (8 * sl), ((8 * sl) + 7)); 501 502 for (sct = 0; sct < 8; sct++) { 503 len += sprintf(page + len, " %02x", 504 irb->ecw[8 * sl + sct]); 505 } 506 len += sprintf(page + len, "\n"); 507 } 508 } else { 509 len += sprintf(page + len, PRINTK_HEADER 510 " SORRY - NO VALID SENSE AVAILABLE\n"); 511 } 512 printk(KERN_ERR "%s", page); 513 514 /* dump the Channel Program */ 515 /* print first CCWs (maximum 8) */ 516 act = req->cpaddr; 517 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); 518 end = min(act + 8, last); 519 len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req); 520 while (act <= end) { 521 len += sprintf(page + len, PRINTK_HEADER 522 " CCW %p: %08X %08X DAT:", 523 act, ((int *) act)[0], ((int *) act)[1]); 524 for (count = 0; count < 32 && count < act->count; 525 count += sizeof(int)) 526 len += sprintf(page + len, " %08X", 527 ((int *) (addr_t) act->cda) 528 [(count>>2)]); 529 len += sprintf(page + len, "\n"); 530 act++; 531 } 532 printk(KERN_ERR "%s", page); 533 534 535 /* print failing CCW area */ 536 len = 0; 537 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { 538 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; 539 len += sprintf(page + len, PRINTK_HEADER "......\n"); 540 } 541 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); 542 while (act <= end) { 543 len += sprintf(page + len, PRINTK_HEADER 544 " CCW %p: %08X %08X DAT:", 545 act, ((int *) act)[0], ((int *) act)[1]); 546 for (count = 0; count < 32 && count < act->count; 547 count += sizeof(int)) 548 len += sprintf(page + len, " %08X", 549 ((int *) (addr_t) act->cda) 550 [(count>>2)]); 551 len += sprintf(page + len, "\n"); 552 act++; 553 } 554 555 /* print last CCWs */ 556 if (act < last - 2) { 557 act = last - 2; 558 len += sprintf(page + len, PRINTK_HEADER "......\n"); 559 } 560 while (act <= last) { 561 len += sprintf(page + len, PRINTK_HEADER 562 " CCW %p: %08X %08X DAT:", 563 act, ((int *) act)[0], ((int *) act)[1]); 564 for (count = 0; count < 32 && count < act->count; 565 count += sizeof(int)) 566 len += sprintf(page + len, " %08X", 567 ((int *) (addr_t) act->cda) 568 [(count>>2)]); 569 len += sprintf(page + len, "\n"); 570 act++; 571 } 572 if (len > 0) 573 printk(KERN_ERR "%s", page); 574 free_page((unsigned long) page); 575} 576 577/* 578 * max_blocks is dependent on the amount of storage that is available 579 * in the static io buffer for each device. Currently each device has 580 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has 581 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use 582 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In 583 * addition we have one define extent ccw + 16 bytes of data and a 584 * locate record ccw for each block (stupid devices!) + 16 bytes of data. 585 * That makes: 586 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum. 587 * We want to fit two into the available memory so that we can immediately 588 * start the next request if one finishes off. That makes 100.1 blocks 589 * for one request. Give a little safety and the result is 96. 590 */ 591static struct dasd_discipline dasd_fba_discipline = { 592 .owner = THIS_MODULE, 593 .name = "FBA ", 594 .ebcname = "FBA ", 595 .max_blocks = 96, 596 .check_device = dasd_fba_check_characteristics, 597 .do_analysis = dasd_fba_do_analysis, 598 .verify_path = dasd_generic_verify_path, 599 .fill_geometry = dasd_fba_fill_geometry, 600 .start_IO = dasd_start_IO, 601 .term_IO = dasd_term_IO, 602 .handle_terminated_request = dasd_fba_handle_terminated_request, 603 .erp_action = dasd_fba_erp_action, 604 .erp_postaction = dasd_fba_erp_postaction, 605 .check_for_device_change = dasd_fba_check_for_device_change, 606 .build_cp = dasd_fba_build_cp, 607 .free_cp = dasd_fba_free_cp, 608 .dump_sense = dasd_fba_dump_sense, 609 .dump_sense_dbf = dasd_fba_dump_sense_dbf, 610 .fill_info = dasd_fba_fill_info, 611}; 612 613static int __init 614dasd_fba_init(void) 615{ 616 int ret; 617 618 ASCEBC(dasd_fba_discipline.ebcname, 4); 619 ret = ccw_driver_register(&dasd_fba_driver); 620 if (!ret) 621 wait_for_device_probe(); 622 623 return ret; 624} 625 626static void __exit 627dasd_fba_cleanup(void) 628{ 629 ccw_driver_unregister(&dasd_fba_driver); 630} 631 632module_init(dasd_fba_init); 633module_exit(dasd_fba_cleanup); 634