1 /* 2 * File...........: linux/drivers/s390/block/dasd_fba.c 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 DASD_FBA_CCW_WRITE 0x41 34 #define DASD_FBA_CCW_READ 0x42 35 #define DASD_FBA_CCW_LOCATE 0x43 36 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63 37 38 MODULE_LICENSE("GPL"); 39 40 static struct dasd_discipline dasd_fba_discipline; 41 42 struct dasd_fba_private { 43 struct dasd_fba_characteristics rdc_data; 44 }; 45 46 static struct ccw_device_id dasd_fba_ids[] = { 47 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1}, 48 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2}, 49 { /* end of list */ }, 50 }; 51 52 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids); 53 54 static struct ccw_driver dasd_fba_driver; /* see below */ 55 static int 56 dasd_fba_probe(struct ccw_device *cdev) 57 { 58 return dasd_generic_probe(cdev, &dasd_fba_discipline); 59 } 60 61 static int 62 dasd_fba_set_online(struct ccw_device *cdev) 63 { 64 return dasd_generic_set_online(cdev, &dasd_fba_discipline); 65 } 66 67 static struct ccw_driver dasd_fba_driver = { 68 .name = "dasd-fba", 69 .owner = THIS_MODULE, 70 .ids = dasd_fba_ids, 71 .probe = dasd_fba_probe, 72 .remove = dasd_generic_remove, 73 .set_offline = dasd_generic_set_offline, 74 .set_online = dasd_fba_set_online, 75 .notify = dasd_generic_notify, 76 .path_event = dasd_generic_path_event, 77 .freeze = dasd_generic_pm_freeze, 78 .thaw = dasd_generic_restore_device, 79 .restore = dasd_generic_restore_device, 80 }; 81 82 static void 83 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw, 84 int blksize, int beg, int nr) 85 { 86 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT; 87 ccw->flags = 0; 88 ccw->count = 16; 89 ccw->cda = (__u32) __pa(data); 90 memset(data, 0, sizeof (struct DE_fba_data)); 91 if (rw == WRITE) 92 (data->mask).perm = 0x0; 93 else if (rw == READ) 94 (data->mask).perm = 0x1; 95 else 96 data->mask.perm = 0x2; 97 data->blk_size = blksize; 98 data->ext_loc = beg; 99 data->ext_end = nr - 1; 100 } 101 102 static void 103 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw, 104 int block_nr, int block_ct) 105 { 106 ccw->cmd_code = DASD_FBA_CCW_LOCATE; 107 ccw->flags = 0; 108 ccw->count = 8; 109 ccw->cda = (__u32) __pa(data); 110 memset(data, 0, sizeof (struct LO_fba_data)); 111 if (rw == WRITE) 112 data->operation.cmd = 0x5; 113 else if (rw == READ) 114 data->operation.cmd = 0x6; 115 else 116 data->operation.cmd = 0x8; 117 data->blk_nr = block_nr; 118 data->blk_ct = block_ct; 119 } 120 121 static int 122 dasd_fba_check_characteristics(struct dasd_device *device) 123 { 124 struct dasd_block *block; 125 struct dasd_fba_private *private; 126 struct ccw_device *cdev = device->cdev; 127 int rc; 128 int readonly; 129 130 private = (struct dasd_fba_private *) device->private; 131 if (!private) { 132 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); 133 if (!private) { 134 dev_warn(&device->cdev->dev, 135 "Allocating memory for private DASD " 136 "data failed\n"); 137 return -ENOMEM; 138 } 139 device->private = (void *) private; 140 } else { 141 memset(private, 0, sizeof(*private)); 142 } 143 block = dasd_alloc_block(); 144 if (IS_ERR(block)) { 145 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate " 146 "dasd block structure"); 147 device->private = NULL; 148 kfree(private); 149 return PTR_ERR(block); 150 } 151 device->block = block; 152 block->base = device; 153 154 /* Read Device Characteristics */ 155 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC, 156 &private->rdc_data, 32); 157 if (rc) { 158 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device " 159 "characteristics returned error %d", rc); 160 device->block = NULL; 161 dasd_free_block(block); 162 device->private = NULL; 163 kfree(private); 164 return rc; 165 } 166 167 device->default_expires = DASD_EXPIRES; 168 device->path_data.opm = LPM_ANYPATH; 169 170 readonly = dasd_device_is_ro(device); 171 if (readonly) 172 set_bit(DASD_FLAG_DEVICE_RO, &device->flags); 173 174 dev_info(&device->cdev->dev, 175 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB " 176 "and %d B/blk%s\n", 177 cdev->id.dev_type, 178 cdev->id.dev_model, 179 cdev->id.cu_type, 180 cdev->id.cu_model, 181 ((private->rdc_data.blk_bdsa * 182 (private->rdc_data.blk_size >> 9)) >> 11), 183 private->rdc_data.blk_size, 184 readonly ? ", read-only device" : ""); 185 return 0; 186 } 187 188 static int dasd_fba_do_analysis(struct dasd_block *block) 189 { 190 struct dasd_fba_private *private; 191 int sb, rc; 192 193 private = (struct dasd_fba_private *) block->base->private; 194 rc = dasd_check_blocksize(private->rdc_data.blk_size); 195 if (rc) { 196 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d", 197 private->rdc_data.blk_size); 198 return rc; 199 } 200 block->blocks = private->rdc_data.blk_bdsa; 201 block->bp_block = private->rdc_data.blk_size; 202 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 203 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) 204 block->s2b_shift++; 205 return 0; 206 } 207 208 static int dasd_fba_fill_geometry(struct dasd_block *block, 209 struct hd_geometry *geo) 210 { 211 if (dasd_check_blocksize(block->bp_block) != 0) 212 return -EINVAL; 213 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 214 geo->heads = 16; 215 geo->sectors = 128 >> block->s2b_shift; 216 return 0; 217 } 218 219 static dasd_erp_fn_t 220 dasd_fba_erp_action(struct dasd_ccw_req * cqr) 221 { 222 return dasd_default_erp_action; 223 } 224 225 static dasd_erp_fn_t 226 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) 227 { 228 if (cqr->function == dasd_default_erp_action) 229 return dasd_default_erp_postaction; 230 231 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p", 232 cqr->function); 233 return NULL; 234 } 235 236 static void dasd_fba_check_for_device_change(struct dasd_device *device, 237 struct dasd_ccw_req *cqr, 238 struct irb *irb) 239 { 240 char mask; 241 242 /* first of all check for state change pending interrupt */ 243 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; 244 if ((irb->scsw.cmd.dstat & mask) == mask) 245 dasd_generic_handle_state_change(device); 246 }; 247 248 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev, 249 struct dasd_block *block, 250 struct request *req) 251 { 252 struct dasd_fba_private *private; 253 unsigned long *idaws; 254 struct LO_fba_data *LO_data; 255 struct dasd_ccw_req *cqr; 256 struct ccw1 *ccw; 257 struct req_iterator iter; 258 struct bio_vec *bv; 259 char *dst; 260 int count, cidaw, cplength, datasize; 261 sector_t recid, first_rec, last_rec; 262 unsigned int blksize, off; 263 unsigned char cmd; 264 265 private = (struct dasd_fba_private *) block->base->private; 266 if (rq_data_dir(req) == READ) { 267 cmd = DASD_FBA_CCW_READ; 268 } else if (rq_data_dir(req) == WRITE) { 269 cmd = DASD_FBA_CCW_WRITE; 270 } else 271 return ERR_PTR(-EINVAL); 272 blksize = block->bp_block; 273 /* Calculate record id of first and last block. */ 274 first_rec = blk_rq_pos(req) >> block->s2b_shift; 275 last_rec = 276 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 277 /* Check struct bio and count the number of blocks for the request. */ 278 count = 0; 279 cidaw = 0; 280 rq_for_each_segment(bv, req, iter) { 281 if (bv->bv_len & (blksize - 1)) 282 /* Fba can only do full blocks. */ 283 return ERR_PTR(-EINVAL); 284 count += bv->bv_len >> (block->s2b_shift + 9); 285 #if defined(CONFIG_64BIT) 286 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len)) 287 cidaw += bv->bv_len / blksize; 288 #endif 289 } 290 /* Paranoia. */ 291 if (count != last_rec - first_rec + 1) 292 return ERR_PTR(-EINVAL); 293 /* 1x define extent + 1x locate record + number of blocks */ 294 cplength = 2 + count; 295 /* 1x define extent + 1x locate record */ 296 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) + 297 cidaw * sizeof(unsigned long); 298 /* 299 * Find out number of additional locate record ccws if the device 300 * can't do data chaining. 301 */ 302 if (private->rdc_data.mode.bits.data_chain == 0) { 303 cplength += count - 1; 304 datasize += (count - 1)*sizeof(struct LO_fba_data); 305 } 306 /* Allocate the ccw request. */ 307 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev); 308 if (IS_ERR(cqr)) 309 return cqr; 310 ccw = cqr->cpaddr; 311 /* First ccw is define extent. */ 312 define_extent(ccw++, cqr->data, rq_data_dir(req), 313 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req)); 314 /* Build locate_record + read/write ccws. */ 315 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data)); 316 LO_data = (struct LO_fba_data *) (idaws + cidaw); 317 /* Locate record for all blocks for smart devices. */ 318 if (private->rdc_data.mode.bits.data_chain != 0) { 319 ccw[-1].flags |= CCW_FLAG_CC; 320 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count); 321 } 322 recid = first_rec; 323 rq_for_each_segment(bv, req, iter) { 324 dst = page_address(bv->bv_page) + bv->bv_offset; 325 if (dasd_page_cache) { 326 char *copy = kmem_cache_alloc(dasd_page_cache, 327 GFP_DMA | __GFP_NOWARN); 328 if (copy && rq_data_dir(req) == WRITE) 329 memcpy(copy + bv->bv_offset, dst, bv->bv_len); 330 if (copy) 331 dst = copy + bv->bv_offset; 332 } 333 for (off = 0; off < bv->bv_len; off += blksize) { 334 /* Locate record for stupid devices. */ 335 if (private->rdc_data.mode.bits.data_chain == 0) { 336 ccw[-1].flags |= CCW_FLAG_CC; 337 locate_record(ccw, LO_data++, 338 rq_data_dir(req), 339 recid - first_rec, 1); 340 ccw->flags = CCW_FLAG_CC; 341 ccw++; 342 } else { 343 if (recid > first_rec) 344 ccw[-1].flags |= CCW_FLAG_DC; 345 else 346 ccw[-1].flags |= CCW_FLAG_CC; 347 } 348 ccw->cmd_code = cmd; 349 ccw->count = block->bp_block; 350 if (idal_is_needed(dst, blksize)) { 351 ccw->cda = (__u32)(addr_t) idaws; 352 ccw->flags = CCW_FLAG_IDA; 353 idaws = idal_create_words(idaws, dst, blksize); 354 } else { 355 ccw->cda = (__u32)(addr_t) dst; 356 ccw->flags = 0; 357 } 358 ccw++; 359 dst += blksize; 360 recid++; 361 } 362 } 363 if (blk_noretry_request(req) || 364 block->base->features & DASD_FEATURE_FAILFAST) 365 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 366 cqr->startdev = memdev; 367 cqr->memdev = memdev; 368 cqr->block = block; 369 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ 370 cqr->retries = 32; 371 cqr->buildclk = get_clock(); 372 cqr->status = DASD_CQR_FILLED; 373 return cqr; 374 } 375 376 static int 377 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req) 378 { 379 struct dasd_fba_private *private; 380 struct ccw1 *ccw; 381 struct req_iterator iter; 382 struct bio_vec *bv; 383 char *dst, *cda; 384 unsigned int blksize, off; 385 int status; 386 387 if (!dasd_page_cache) 388 goto out; 389 private = (struct dasd_fba_private *) cqr->block->base->private; 390 blksize = cqr->block->bp_block; 391 ccw = cqr->cpaddr; 392 /* Skip over define extent & locate record. */ 393 ccw++; 394 if (private->rdc_data.mode.bits.data_chain != 0) 395 ccw++; 396 rq_for_each_segment(bv, req, iter) { 397 dst = page_address(bv->bv_page) + bv->bv_offset; 398 for (off = 0; off < bv->bv_len; off += blksize) { 399 /* Skip locate record. */ 400 if (private->rdc_data.mode.bits.data_chain == 0) 401 ccw++; 402 if (dst) { 403 if (ccw->flags & CCW_FLAG_IDA) 404 cda = *((char **)((addr_t) ccw->cda)); 405 else 406 cda = (char *)((addr_t) ccw->cda); 407 if (dst != cda) { 408 if (rq_data_dir(req) == READ) 409 memcpy(dst, cda, bv->bv_len); 410 kmem_cache_free(dasd_page_cache, 411 (void *)((addr_t)cda & PAGE_MASK)); 412 } 413 dst = NULL; 414 } 415 ccw++; 416 } 417 } 418 out: 419 status = cqr->status == DASD_CQR_DONE; 420 dasd_sfree_request(cqr, cqr->memdev); 421 return status; 422 } 423 424 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr) 425 { 426 cqr->status = DASD_CQR_FILLED; 427 }; 428 429 static int 430 dasd_fba_fill_info(struct dasd_device * device, 431 struct dasd_information2_t * info) 432 { 433 info->label_block = 1; 434 info->FBA_layout = 1; 435 info->format = DASD_FORMAT_LDL; 436 info->characteristics_size = sizeof(struct dasd_fba_characteristics); 437 memcpy(info->characteristics, 438 &((struct dasd_fba_private *) device->private)->rdc_data, 439 sizeof (struct dasd_fba_characteristics)); 440 info->confdata_size = 0; 441 return 0; 442 } 443 444 static void 445 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb, 446 char *reason) 447 { 448 u64 *sense; 449 450 sense = (u64 *) dasd_get_sense(irb); 451 if (sense) { 452 DBF_DEV_EVENT(DBF_EMERG, device, 453 "%s: %s %02x%02x%02x %016llx %016llx %016llx " 454 "%016llx", reason, 455 scsw_is_tm(&irb->scsw) ? "t" : "c", 456 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw), 457 scsw_dstat(&irb->scsw), sense[0], sense[1], 458 sense[2], sense[3]); 459 } else { 460 DBF_DEV_EVENT(DBF_EMERG, device, "%s", 461 "SORRY - NO VALID SENSE AVAILABLE\n"); 462 } 463 } 464 465 466 static void 467 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 468 struct irb *irb) 469 { 470 char *page; 471 struct ccw1 *act, *end, *last; 472 int len, sl, sct, count; 473 474 page = (char *) get_zeroed_page(GFP_ATOMIC); 475 if (page == NULL) { 476 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 477 "No memory to dump sense data"); 478 return; 479 } 480 len = sprintf(page, KERN_ERR PRINTK_HEADER 481 " I/O status report for device %s:\n", 482 dev_name(&device->cdev->dev)); 483 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 484 " in req: %p CS: 0x%02X DS: 0x%02X\n", req, 485 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat); 486 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 487 " device %s: Failing CCW: %p\n", 488 dev_name(&device->cdev->dev), 489 (void *) (addr_t) irb->scsw.cmd.cpa); 490 if (irb->esw.esw0.erw.cons) { 491 for (sl = 0; sl < 4; sl++) { 492 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 493 " Sense(hex) %2d-%2d:", 494 (8 * sl), ((8 * sl) + 7)); 495 496 for (sct = 0; sct < 8; sct++) { 497 len += sprintf(page + len, " %02x", 498 irb->ecw[8 * sl + sct]); 499 } 500 len += sprintf(page + len, "\n"); 501 } 502 } else { 503 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 504 " SORRY - NO VALID SENSE AVAILABLE\n"); 505 } 506 printk(KERN_ERR "%s", page); 507 508 /* dump the Channel Program */ 509 /* print first CCWs (maximum 8) */ 510 act = req->cpaddr; 511 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); 512 end = min(act + 8, last); 513 len = sprintf(page, KERN_ERR PRINTK_HEADER 514 " Related CP in req: %p\n", req); 515 while (act <= end) { 516 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 517 " CCW %p: %08X %08X DAT:", 518 act, ((int *) act)[0], ((int *) act)[1]); 519 for (count = 0; count < 32 && count < act->count; 520 count += sizeof(int)) 521 len += sprintf(page + len, " %08X", 522 ((int *) (addr_t) act->cda) 523 [(count>>2)]); 524 len += sprintf(page + len, "\n"); 525 act++; 526 } 527 printk(KERN_ERR "%s", page); 528 529 530 /* print failing CCW area */ 531 len = 0; 532 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { 533 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; 534 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 535 } 536 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); 537 while (act <= end) { 538 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 539 " CCW %p: %08X %08X DAT:", 540 act, ((int *) act)[0], ((int *) act)[1]); 541 for (count = 0; count < 32 && count < act->count; 542 count += sizeof(int)) 543 len += sprintf(page + len, " %08X", 544 ((int *) (addr_t) act->cda) 545 [(count>>2)]); 546 len += sprintf(page + len, "\n"); 547 act++; 548 } 549 550 /* print last CCWs */ 551 if (act < last - 2) { 552 act = last - 2; 553 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 554 } 555 while (act <= last) { 556 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 557 " CCW %p: %08X %08X DAT:", 558 act, ((int *) act)[0], ((int *) act)[1]); 559 for (count = 0; count < 32 && count < act->count; 560 count += sizeof(int)) 561 len += sprintf(page + len, " %08X", 562 ((int *) (addr_t) act->cda) 563 [(count>>2)]); 564 len += sprintf(page + len, "\n"); 565 act++; 566 } 567 if (len > 0) 568 printk(KERN_ERR "%s", page); 569 free_page((unsigned long) page); 570 } 571 572 /* 573 * max_blocks is dependent on the amount of storage that is available 574 * in the static io buffer for each device. Currently each device has 575 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has 576 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use 577 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In 578 * addition we have one define extent ccw + 16 bytes of data and a 579 * locate record ccw for each block (stupid devices!) + 16 bytes of data. 580 * That makes: 581 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum. 582 * We want to fit two into the available memory so that we can immediately 583 * start the next request if one finishes off. That makes 100.1 blocks 584 * for one request. Give a little safety and the result is 96. 585 */ 586 static struct dasd_discipline dasd_fba_discipline = { 587 .owner = THIS_MODULE, 588 .name = "FBA ", 589 .ebcname = "FBA ", 590 .max_blocks = 96, 591 .check_device = dasd_fba_check_characteristics, 592 .do_analysis = dasd_fba_do_analysis, 593 .verify_path = dasd_generic_verify_path, 594 .fill_geometry = dasd_fba_fill_geometry, 595 .start_IO = dasd_start_IO, 596 .term_IO = dasd_term_IO, 597 .handle_terminated_request = dasd_fba_handle_terminated_request, 598 .erp_action = dasd_fba_erp_action, 599 .erp_postaction = dasd_fba_erp_postaction, 600 .check_for_device_change = dasd_fba_check_for_device_change, 601 .build_cp = dasd_fba_build_cp, 602 .free_cp = dasd_fba_free_cp, 603 .dump_sense = dasd_fba_dump_sense, 604 .dump_sense_dbf = dasd_fba_dump_sense_dbf, 605 .fill_info = dasd_fba_fill_info, 606 }; 607 608 static int __init 609 dasd_fba_init(void) 610 { 611 int ret; 612 613 ASCEBC(dasd_fba_discipline.ebcname, 4); 614 ret = ccw_driver_register(&dasd_fba_driver); 615 if (!ret) 616 wait_for_device_probe(); 617 618 return ret; 619 } 620 621 static void __exit 622 dasd_fba_cleanup(void) 623 { 624 ccw_driver_unregister(&dasd_fba_driver); 625 } 626 627 module_init(dasd_fba_init); 628 module_exit(dasd_fba_cleanup); 629