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 39 MODULE_LICENSE("GPL"); 40 41 static struct dasd_discipline dasd_fba_discipline; 42 43 struct dasd_fba_private { 44 struct dasd_fba_characteristics rdc_data; 45 }; 46 47 static 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 53 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids); 54 55 static struct ccw_driver dasd_fba_driver; /* see below */ 56 static int 57 dasd_fba_probe(struct ccw_device *cdev) 58 { 59 return dasd_generic_probe(cdev, &dasd_fba_discipline); 60 } 61 62 static int 63 dasd_fba_set_online(struct ccw_device *cdev) 64 { 65 return dasd_generic_set_online(cdev, &dasd_fba_discipline); 66 } 67 68 static 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 86 static void 87 define_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 } 105 106 static void 107 locate_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 } 124 125 static int 126 dasd_fba_check_characteristics(struct dasd_device *device) 127 { 128 struct dasd_fba_private *private = device->private; 129 struct ccw_device *cdev = device->cdev; 130 struct dasd_block *block; 131 int readonly, rc; 132 133 if (!private) { 134 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); 135 if (!private) { 136 dev_warn(&device->cdev->dev, 137 "Allocating memory for private DASD " 138 "data failed\n"); 139 return -ENOMEM; 140 } 141 device->private = private; 142 } else { 143 memset(private, 0, sizeof(*private)); 144 } 145 block = dasd_alloc_block(); 146 if (IS_ERR(block)) { 147 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate " 148 "dasd block structure"); 149 device->private = NULL; 150 kfree(private); 151 return PTR_ERR(block); 152 } 153 device->block = block; 154 block->base = device; 155 156 /* Read Device Characteristics */ 157 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC, 158 &private->rdc_data, 32); 159 if (rc) { 160 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device " 161 "characteristics returned error %d", rc); 162 device->block = NULL; 163 dasd_free_block(block); 164 device->private = NULL; 165 kfree(private); 166 return rc; 167 } 168 169 device->default_expires = DASD_EXPIRES; 170 device->default_retries = FBA_DEFAULT_RETRIES; 171 device->path_data.opm = LPM_ANYPATH; 172 173 readonly = dasd_device_is_ro(device); 174 if (readonly) 175 set_bit(DASD_FLAG_DEVICE_RO, &device->flags); 176 177 dev_info(&device->cdev->dev, 178 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB " 179 "and %d B/blk%s\n", 180 cdev->id.dev_type, 181 cdev->id.dev_model, 182 cdev->id.cu_type, 183 cdev->id.cu_model, 184 ((private->rdc_data.blk_bdsa * 185 (private->rdc_data.blk_size >> 9)) >> 11), 186 private->rdc_data.blk_size, 187 readonly ? ", read-only device" : ""); 188 return 0; 189 } 190 191 static int dasd_fba_do_analysis(struct dasd_block *block) 192 { 193 struct dasd_fba_private *private = block->base->private; 194 int sb, rc; 195 196 rc = dasd_check_blocksize(private->rdc_data.blk_size); 197 if (rc) { 198 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d", 199 private->rdc_data.blk_size); 200 return rc; 201 } 202 block->blocks = private->rdc_data.blk_bdsa; 203 block->bp_block = private->rdc_data.blk_size; 204 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 205 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) 206 block->s2b_shift++; 207 return 0; 208 } 209 210 static int dasd_fba_fill_geometry(struct dasd_block *block, 211 struct hd_geometry *geo) 212 { 213 if (dasd_check_blocksize(block->bp_block) != 0) 214 return -EINVAL; 215 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 216 geo->heads = 16; 217 geo->sectors = 128 >> block->s2b_shift; 218 return 0; 219 } 220 221 static dasd_erp_fn_t 222 dasd_fba_erp_action(struct dasd_ccw_req * cqr) 223 { 224 return dasd_default_erp_action; 225 } 226 227 static dasd_erp_fn_t 228 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) 229 { 230 if (cqr->function == dasd_default_erp_action) 231 return dasd_default_erp_postaction; 232 233 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p", 234 cqr->function); 235 return NULL; 236 } 237 238 static void dasd_fba_check_for_device_change(struct dasd_device *device, 239 struct dasd_ccw_req *cqr, 240 struct irb *irb) 241 { 242 char mask; 243 244 /* first of all check for state change pending interrupt */ 245 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; 246 if ((irb->scsw.cmd.dstat & mask) == mask) 247 dasd_generic_handle_state_change(device); 248 }; 249 250 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev, 251 struct dasd_block *block, 252 struct request *req) 253 { 254 struct dasd_fba_private *private = block->base->private; 255 unsigned long *idaws; 256 struct LO_fba_data *LO_data; 257 struct dasd_ccw_req *cqr; 258 struct ccw1 *ccw; 259 struct req_iterator iter; 260 struct bio_vec bv; 261 char *dst; 262 int count, cidaw, cplength, datasize; 263 sector_t recid, first_rec, last_rec; 264 unsigned int blksize, off; 265 unsigned char cmd; 266 267 if (rq_data_dir(req) == READ) { 268 cmd = DASD_FBA_CCW_READ; 269 } else if (rq_data_dir(req) == WRITE) { 270 cmd = DASD_FBA_CCW_WRITE; 271 } else 272 return ERR_PTR(-EINVAL); 273 blksize = block->bp_block; 274 /* Calculate record id of first and last block. */ 275 first_rec = blk_rq_pos(req) >> block->s2b_shift; 276 last_rec = 277 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 278 /* Check struct bio and count the number of blocks for the request. */ 279 count = 0; 280 cidaw = 0; 281 rq_for_each_segment(bv, req, iter) { 282 if (bv.bv_len & (blksize - 1)) 283 /* Fba can only do full blocks. */ 284 return ERR_PTR(-EINVAL); 285 count += bv.bv_len >> (block->s2b_shift + 9); 286 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len)) 287 cidaw += bv.bv_len / blksize; 288 } 289 /* Paranoia. */ 290 if (count != last_rec - first_rec + 1) 291 return ERR_PTR(-EINVAL); 292 /* 1x define extent + 1x locate record + number of blocks */ 293 cplength = 2 + count; 294 /* 1x define extent + 1x locate record */ 295 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) + 296 cidaw * sizeof(unsigned long); 297 /* 298 * Find out number of additional locate record ccws if the device 299 * can't do data chaining. 300 */ 301 if (private->rdc_data.mode.bits.data_chain == 0) { 302 cplength += count - 1; 303 datasize += (count - 1)*sizeof(struct LO_fba_data); 304 } 305 /* Allocate the ccw request. */ 306 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev); 307 if (IS_ERR(cqr)) 308 return cqr; 309 ccw = cqr->cpaddr; 310 /* First ccw is define extent. */ 311 define_extent(ccw++, cqr->data, rq_data_dir(req), 312 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req)); 313 /* Build locate_record + read/write ccws. */ 314 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data)); 315 LO_data = (struct LO_fba_data *) (idaws + cidaw); 316 /* Locate record for all blocks for smart devices. */ 317 if (private->rdc_data.mode.bits.data_chain != 0) { 318 ccw[-1].flags |= CCW_FLAG_CC; 319 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count); 320 } 321 recid = first_rec; 322 rq_for_each_segment(bv, req, iter) { 323 dst = page_address(bv.bv_page) + bv.bv_offset; 324 if (dasd_page_cache) { 325 char *copy = kmem_cache_alloc(dasd_page_cache, 326 GFP_DMA | __GFP_NOWARN); 327 if (copy && rq_data_dir(req) == WRITE) 328 memcpy(copy + bv.bv_offset, dst, bv.bv_len); 329 if (copy) 330 dst = copy + bv.bv_offset; 331 } 332 for (off = 0; off < bv.bv_len; off += blksize) { 333 /* Locate record for stupid devices. */ 334 if (private->rdc_data.mode.bits.data_chain == 0) { 335 ccw[-1].flags |= CCW_FLAG_CC; 336 locate_record(ccw, LO_data++, 337 rq_data_dir(req), 338 recid - first_rec, 1); 339 ccw->flags = CCW_FLAG_CC; 340 ccw++; 341 } else { 342 if (recid > first_rec) 343 ccw[-1].flags |= CCW_FLAG_DC; 344 else 345 ccw[-1].flags |= CCW_FLAG_CC; 346 } 347 ccw->cmd_code = cmd; 348 ccw->count = block->bp_block; 349 if (idal_is_needed(dst, blksize)) { 350 ccw->cda = (__u32)(addr_t) idaws; 351 ccw->flags = CCW_FLAG_IDA; 352 idaws = idal_create_words(idaws, dst, blksize); 353 } else { 354 ccw->cda = (__u32)(addr_t) dst; 355 ccw->flags = 0; 356 } 357 ccw++; 358 dst += blksize; 359 recid++; 360 } 361 } 362 if (blk_noretry_request(req) || 363 block->base->features & DASD_FEATURE_FAILFAST) 364 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 365 cqr->startdev = memdev; 366 cqr->memdev = memdev; 367 cqr->block = block; 368 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ 369 cqr->retries = memdev->default_retries; 370 cqr->buildclk = get_tod_clock(); 371 cqr->status = DASD_CQR_FILLED; 372 return cqr; 373 } 374 375 static int 376 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req) 377 { 378 struct dasd_fba_private *private = cqr->block->base->private; 379 struct ccw1 *ccw; 380 struct req_iterator iter; 381 struct bio_vec bv; 382 char *dst, *cda; 383 unsigned int blksize, off; 384 int status; 385 386 if (!dasd_page_cache) 387 goto out; 388 blksize = cqr->block->bp_block; 389 ccw = cqr->cpaddr; 390 /* Skip over define extent & locate record. */ 391 ccw++; 392 if (private->rdc_data.mode.bits.data_chain != 0) 393 ccw++; 394 rq_for_each_segment(bv, req, iter) { 395 dst = page_address(bv.bv_page) + bv.bv_offset; 396 for (off = 0; off < bv.bv_len; off += blksize) { 397 /* Skip locate record. */ 398 if (private->rdc_data.mode.bits.data_chain == 0) 399 ccw++; 400 if (dst) { 401 if (ccw->flags & CCW_FLAG_IDA) 402 cda = *((char **)((addr_t) ccw->cda)); 403 else 404 cda = (char *)((addr_t) ccw->cda); 405 if (dst != cda) { 406 if (rq_data_dir(req) == READ) 407 memcpy(dst, cda, bv.bv_len); 408 kmem_cache_free(dasd_page_cache, 409 (void *)((addr_t)cda & PAGE_MASK)); 410 } 411 dst = NULL; 412 } 413 ccw++; 414 } 415 } 416 out: 417 status = cqr->status == DASD_CQR_DONE; 418 dasd_sfree_request(cqr, cqr->memdev); 419 return status; 420 } 421 422 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr) 423 { 424 if (cqr->retries < 0) 425 cqr->status = DASD_CQR_FAILED; 426 else 427 cqr->status = DASD_CQR_FILLED; 428 }; 429 430 static int 431 dasd_fba_fill_info(struct dasd_device * device, 432 struct dasd_information2_t * info) 433 { 434 struct dasd_fba_private *private = device->private; 435 436 info->label_block = 1; 437 info->FBA_layout = 1; 438 info->format = DASD_FORMAT_LDL; 439 info->characteristics_size = sizeof(private->rdc_data); 440 memcpy(info->characteristics, &private->rdc_data, 441 sizeof(private->rdc_data)); 442 info->confdata_size = 0; 443 return 0; 444 } 445 446 static void 447 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb, 448 char *reason) 449 { 450 u64 *sense; 451 452 sense = (u64 *) dasd_get_sense(irb); 453 if (sense) { 454 DBF_DEV_EVENT(DBF_EMERG, device, 455 "%s: %s %02x%02x%02x %016llx %016llx %016llx " 456 "%016llx", reason, 457 scsw_is_tm(&irb->scsw) ? "t" : "c", 458 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw), 459 scsw_dstat(&irb->scsw), sense[0], sense[1], 460 sense[2], sense[3]); 461 } else { 462 DBF_DEV_EVENT(DBF_EMERG, device, "%s", 463 "SORRY - NO VALID SENSE AVAILABLE\n"); 464 } 465 } 466 467 468 static void 469 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 470 struct irb *irb) 471 { 472 char *page; 473 struct ccw1 *act, *end, *last; 474 int len, sl, sct, count; 475 476 page = (char *) get_zeroed_page(GFP_ATOMIC); 477 if (page == NULL) { 478 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 479 "No memory to dump sense data"); 480 return; 481 } 482 len = sprintf(page, PRINTK_HEADER 483 " I/O status report for device %s:\n", 484 dev_name(&device->cdev->dev)); 485 len += sprintf(page + len, PRINTK_HEADER 486 " in req: %p CS: 0x%02X DS: 0x%02X\n", req, 487 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat); 488 len += sprintf(page + len, PRINTK_HEADER 489 " device %s: Failing CCW: %p\n", 490 dev_name(&device->cdev->dev), 491 (void *) (addr_t) irb->scsw.cmd.cpa); 492 if (irb->esw.esw0.erw.cons) { 493 for (sl = 0; sl < 4; sl++) { 494 len += sprintf(page + len, PRINTK_HEADER 495 " Sense(hex) %2d-%2d:", 496 (8 * sl), ((8 * sl) + 7)); 497 498 for (sct = 0; sct < 8; sct++) { 499 len += sprintf(page + len, " %02x", 500 irb->ecw[8 * sl + sct]); 501 } 502 len += sprintf(page + len, "\n"); 503 } 504 } else { 505 len += sprintf(page + len, PRINTK_HEADER 506 " SORRY - NO VALID SENSE AVAILABLE\n"); 507 } 508 printk(KERN_ERR "%s", page); 509 510 /* dump the Channel Program */ 511 /* print first CCWs (maximum 8) */ 512 act = req->cpaddr; 513 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); 514 end = min(act + 8, last); 515 len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req); 516 while (act <= end) { 517 len += sprintf(page + len, PRINTK_HEADER 518 " CCW %p: %08X %08X DAT:", 519 act, ((int *) act)[0], ((int *) act)[1]); 520 for (count = 0; count < 32 && count < act->count; 521 count += sizeof(int)) 522 len += sprintf(page + len, " %08X", 523 ((int *) (addr_t) act->cda) 524 [(count>>2)]); 525 len += sprintf(page + len, "\n"); 526 act++; 527 } 528 printk(KERN_ERR "%s", page); 529 530 531 /* print failing CCW area */ 532 len = 0; 533 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { 534 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; 535 len += sprintf(page + len, PRINTK_HEADER "......\n"); 536 } 537 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); 538 while (act <= end) { 539 len += sprintf(page + len, PRINTK_HEADER 540 " CCW %p: %08X %08X DAT:", 541 act, ((int *) act)[0], ((int *) act)[1]); 542 for (count = 0; count < 32 && count < act->count; 543 count += sizeof(int)) 544 len += sprintf(page + len, " %08X", 545 ((int *) (addr_t) act->cda) 546 [(count>>2)]); 547 len += sprintf(page + len, "\n"); 548 act++; 549 } 550 551 /* print last CCWs */ 552 if (act < last - 2) { 553 act = last - 2; 554 len += sprintf(page + len, PRINTK_HEADER "......\n"); 555 } 556 while (act <= last) { 557 len += sprintf(page + len, PRINTK_HEADER 558 " CCW %p: %08X %08X DAT:", 559 act, ((int *) act)[0], ((int *) act)[1]); 560 for (count = 0; count < 32 && count < act->count; 561 count += sizeof(int)) 562 len += sprintf(page + len, " %08X", 563 ((int *) (addr_t) act->cda) 564 [(count>>2)]); 565 len += sprintf(page + len, "\n"); 566 act++; 567 } 568 if (len > 0) 569 printk(KERN_ERR "%s", page); 570 free_page((unsigned long) page); 571 } 572 573 /* 574 * max_blocks is dependent on the amount of storage that is available 575 * in the static io buffer for each device. Currently each device has 576 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has 577 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use 578 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In 579 * addition we have one define extent ccw + 16 bytes of data and a 580 * locate record ccw for each block (stupid devices!) + 16 bytes of data. 581 * That makes: 582 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum. 583 * We want to fit two into the available memory so that we can immediately 584 * start the next request if one finishes off. That makes 100.1 blocks 585 * for one request. Give a little safety and the result is 96. 586 */ 587 static struct dasd_discipline dasd_fba_discipline = { 588 .owner = THIS_MODULE, 589 .name = "FBA ", 590 .ebcname = "FBA ", 591 .max_blocks = 96, 592 .check_device = dasd_fba_check_characteristics, 593 .do_analysis = dasd_fba_do_analysis, 594 .verify_path = dasd_generic_verify_path, 595 .fill_geometry = dasd_fba_fill_geometry, 596 .start_IO = dasd_start_IO, 597 .term_IO = dasd_term_IO, 598 .handle_terminated_request = dasd_fba_handle_terminated_request, 599 .erp_action = dasd_fba_erp_action, 600 .erp_postaction = dasd_fba_erp_postaction, 601 .check_for_device_change = dasd_fba_check_for_device_change, 602 .build_cp = dasd_fba_build_cp, 603 .free_cp = dasd_fba_free_cp, 604 .dump_sense = dasd_fba_dump_sense, 605 .dump_sense_dbf = dasd_fba_dump_sense_dbf, 606 .fill_info = dasd_fba_fill_info, 607 }; 608 609 static int __init 610 dasd_fba_init(void) 611 { 612 int ret; 613 614 ASCEBC(dasd_fba_discipline.ebcname, 4); 615 ret = ccw_driver_register(&dasd_fba_driver); 616 if (!ret) 617 wait_for_device_probe(); 618 619 return ret; 620 } 621 622 static void __exit 623 dasd_fba_cleanup(void) 624 { 625 ccw_driver_unregister(&dasd_fba_driver); 626 } 627 628 module_init(dasd_fba_init); 629 module_exit(dasd_fba_cleanup); 630