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" 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/todclk.h> 24 #include <asm/ccwdev.h> 25 26 #include "dasd_int.h" 27 #include "dasd_fba.h" 28 29 #ifdef PRINTK_HEADER 30 #undef PRINTK_HEADER 31 #endif /* PRINTK_HEADER */ 32 #define PRINTK_HEADER "dasd(fba):" 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 .name = "dasd-fba", 70 .owner = THIS_MODULE, 71 .ids = dasd_fba_ids, 72 .probe = dasd_fba_probe, 73 .remove = dasd_generic_remove, 74 .set_offline = dasd_generic_set_offline, 75 .set_online = dasd_fba_set_online, 76 .notify = dasd_generic_notify, 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; 128 129 private = (struct dasd_fba_private *) device->private; 130 if (!private) { 131 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); 132 if (!private) { 133 dev_warn(&device->cdev->dev, 134 "Allocating memory for private DASD " 135 "data failed\n"); 136 return -ENOMEM; 137 } 138 device->private = (void *) private; 139 } else { 140 memset(private, 0, sizeof(*private)); 141 } 142 block = dasd_alloc_block(); 143 if (IS_ERR(block)) { 144 DBF_EVENT(DBF_WARNING, "could not allocate dasd block " 145 "structure for device: %s", 146 dev_name(&device->cdev->dev)); 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, "FBA ", &private->rdc_data, 156 32); 157 if (rc) { 158 DBF_EVENT(DBF_WARNING, "Read device characteristics returned " 159 "error %d for device: %s", 160 rc, dev_name(&device->cdev->dev)); 161 device->block = NULL; 162 dasd_free_block(block); 163 device->private = NULL; 164 kfree(private); 165 return rc; 166 } 167 168 dev_info(&device->cdev->dev, 169 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB " 170 "and %d B/blk\n", 171 cdev->id.dev_type, 172 cdev->id.dev_model, 173 cdev->id.cu_type, 174 cdev->id.cu_model, 175 ((private->rdc_data.blk_bdsa * 176 (private->rdc_data.blk_size >> 9)) >> 11), 177 private->rdc_data.blk_size); 178 return 0; 179 } 180 181 static int dasd_fba_do_analysis(struct dasd_block *block) 182 { 183 struct dasd_fba_private *private; 184 int sb, rc; 185 186 private = (struct dasd_fba_private *) block->base->private; 187 rc = dasd_check_blocksize(private->rdc_data.blk_size); 188 if (rc) { 189 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d", 190 private->rdc_data.blk_size); 191 return rc; 192 } 193 block->blocks = private->rdc_data.blk_bdsa; 194 block->bp_block = private->rdc_data.blk_size; 195 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 196 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) 197 block->s2b_shift++; 198 return 0; 199 } 200 201 static int dasd_fba_fill_geometry(struct dasd_block *block, 202 struct hd_geometry *geo) 203 { 204 if (dasd_check_blocksize(block->bp_block) != 0) 205 return -EINVAL; 206 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 207 geo->heads = 16; 208 geo->sectors = 128 >> block->s2b_shift; 209 return 0; 210 } 211 212 static dasd_erp_fn_t 213 dasd_fba_erp_action(struct dasd_ccw_req * cqr) 214 { 215 return dasd_default_erp_action; 216 } 217 218 static dasd_erp_fn_t 219 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) 220 { 221 if (cqr->function == dasd_default_erp_action) 222 return dasd_default_erp_postaction; 223 224 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p", 225 cqr->function); 226 return NULL; 227 } 228 229 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device, 230 struct irb *irb) 231 { 232 char mask; 233 234 /* first of all check for state change pending interrupt */ 235 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; 236 if ((irb->scsw.cmd.dstat & mask) == mask) { 237 dasd_generic_handle_state_change(device); 238 return; 239 } 240 241 /* check for unsolicited interrupts */ 242 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 243 "unsolicited interrupt received"); 244 device->discipline->dump_sense_dbf(device, irb, "unsolicited"); 245 dasd_schedule_device_bh(device); 246 return; 247 }; 248 249 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev, 250 struct dasd_block *block, 251 struct request *req) 252 { 253 struct dasd_fba_private *private; 254 unsigned long *idaws; 255 struct LO_fba_data *LO_data; 256 struct dasd_ccw_req *cqr; 257 struct ccw1 *ccw; 258 struct req_iterator iter; 259 struct bio_vec *bv; 260 char *dst; 261 int count, cidaw, cplength, datasize; 262 sector_t recid, first_rec, last_rec; 263 unsigned int blksize, off; 264 unsigned char cmd; 265 266 private = (struct dasd_fba_private *) block->base->private; 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 defined(CONFIG_64BIT) 287 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len)) 288 cidaw += bv->bv_len / blksize; 289 #endif 290 } 291 /* Paranoia. */ 292 if (count != last_rec - first_rec + 1) 293 return ERR_PTR(-EINVAL); 294 /* 1x define extent + 1x locate record + number of blocks */ 295 cplength = 2 + count; 296 /* 1x define extent + 1x locate record */ 297 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) + 298 cidaw * sizeof(unsigned long); 299 /* 300 * Find out number of additional locate record ccws if the device 301 * can't do data chaining. 302 */ 303 if (private->rdc_data.mode.bits.data_chain == 0) { 304 cplength += count - 1; 305 datasize += (count - 1)*sizeof(struct LO_fba_data); 306 } 307 /* Allocate the ccw request. */ 308 cqr = dasd_smalloc_request(dasd_fba_discipline.name, 309 cplength, datasize, memdev); 310 if (IS_ERR(cqr)) 311 return cqr; 312 ccw = cqr->cpaddr; 313 /* First ccw is define extent. */ 314 define_extent(ccw++, cqr->data, rq_data_dir(req), 315 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req)); 316 /* Build locate_record + read/write ccws. */ 317 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data)); 318 LO_data = (struct LO_fba_data *) (idaws + cidaw); 319 /* Locate record for all blocks for smart devices. */ 320 if (private->rdc_data.mode.bits.data_chain != 0) { 321 ccw[-1].flags |= CCW_FLAG_CC; 322 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count); 323 } 324 recid = first_rec; 325 rq_for_each_segment(bv, req, iter) { 326 dst = page_address(bv->bv_page) + bv->bv_offset; 327 if (dasd_page_cache) { 328 char *copy = kmem_cache_alloc(dasd_page_cache, 329 GFP_DMA | __GFP_NOWARN); 330 if (copy && rq_data_dir(req) == WRITE) 331 memcpy(copy + bv->bv_offset, dst, bv->bv_len); 332 if (copy) 333 dst = copy + bv->bv_offset; 334 } 335 for (off = 0; off < bv->bv_len; off += blksize) { 336 /* Locate record for stupid devices. */ 337 if (private->rdc_data.mode.bits.data_chain == 0) { 338 ccw[-1].flags |= CCW_FLAG_CC; 339 locate_record(ccw, LO_data++, 340 rq_data_dir(req), 341 recid - first_rec, 1); 342 ccw->flags = CCW_FLAG_CC; 343 ccw++; 344 } else { 345 if (recid > first_rec) 346 ccw[-1].flags |= CCW_FLAG_DC; 347 else 348 ccw[-1].flags |= CCW_FLAG_CC; 349 } 350 ccw->cmd_code = cmd; 351 ccw->count = block->bp_block; 352 if (idal_is_needed(dst, blksize)) { 353 ccw->cda = (__u32)(addr_t) idaws; 354 ccw->flags = CCW_FLAG_IDA; 355 idaws = idal_create_words(idaws, dst, blksize); 356 } else { 357 ccw->cda = (__u32)(addr_t) dst; 358 ccw->flags = 0; 359 } 360 ccw++; 361 dst += blksize; 362 recid++; 363 } 364 } 365 if (blk_noretry_request(req) || 366 block->base->features & DASD_FEATURE_FAILFAST) 367 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 368 cqr->startdev = memdev; 369 cqr->memdev = memdev; 370 cqr->block = block; 371 cqr->expires = 5 * 60 * HZ; /* 5 minutes */ 372 cqr->retries = 32; 373 cqr->buildclk = get_clock(); 374 cqr->status = DASD_CQR_FILLED; 375 return cqr; 376 } 377 378 static int 379 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req) 380 { 381 struct dasd_fba_private *private; 382 struct ccw1 *ccw; 383 struct req_iterator iter; 384 struct bio_vec *bv; 385 char *dst, *cda; 386 unsigned int blksize, off; 387 int status; 388 389 if (!dasd_page_cache) 390 goto out; 391 private = (struct dasd_fba_private *) cqr->block->base->private; 392 blksize = cqr->block->bp_block; 393 ccw = cqr->cpaddr; 394 /* Skip over define extent & locate record. */ 395 ccw++; 396 if (private->rdc_data.mode.bits.data_chain != 0) 397 ccw++; 398 rq_for_each_segment(bv, req, iter) { 399 dst = page_address(bv->bv_page) + bv->bv_offset; 400 for (off = 0; off < bv->bv_len; off += blksize) { 401 /* Skip locate record. */ 402 if (private->rdc_data.mode.bits.data_chain == 0) 403 ccw++; 404 if (dst) { 405 if (ccw->flags & CCW_FLAG_IDA) 406 cda = *((char **)((addr_t) ccw->cda)); 407 else 408 cda = (char *)((addr_t) ccw->cda); 409 if (dst != cda) { 410 if (rq_data_dir(req) == READ) 411 memcpy(dst, cda, bv->bv_len); 412 kmem_cache_free(dasd_page_cache, 413 (void *)((addr_t)cda & PAGE_MASK)); 414 } 415 dst = NULL; 416 } 417 ccw++; 418 } 419 } 420 out: 421 status = cqr->status == DASD_CQR_DONE; 422 dasd_sfree_request(cqr, cqr->memdev); 423 return status; 424 } 425 426 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr) 427 { 428 cqr->status = DASD_CQR_FILLED; 429 }; 430 431 static int 432 dasd_fba_fill_info(struct dasd_device * device, 433 struct dasd_information2_t * info) 434 { 435 info->label_block = 1; 436 info->FBA_layout = 1; 437 info->format = DASD_FORMAT_LDL; 438 info->characteristics_size = sizeof(struct dasd_fba_characteristics); 439 memcpy(info->characteristics, 440 &((struct dasd_fba_private *) device->private)->rdc_data, 441 sizeof (struct dasd_fba_characteristics)); 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, KERN_ERR PRINTK_HEADER 483 " I/O status report for device %s:\n", 484 dev_name(&device->cdev->dev)); 485 len += sprintf(page + len, KERN_ERR 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, KERN_ERR 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, KERN_ERR 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, KERN_ERR 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, KERN_ERR PRINTK_HEADER 516 " Related CP in req: %p\n", req); 517 while (act <= end) { 518 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 519 " CCW %p: %08X %08X DAT:", 520 act, ((int *) act)[0], ((int *) act)[1]); 521 for (count = 0; count < 32 && count < act->count; 522 count += sizeof(int)) 523 len += sprintf(page + len, " %08X", 524 ((int *) (addr_t) act->cda) 525 [(count>>2)]); 526 len += sprintf(page + len, "\n"); 527 act++; 528 } 529 printk(KERN_ERR "%s", page); 530 531 532 /* print failing CCW area */ 533 len = 0; 534 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { 535 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; 536 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 537 } 538 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); 539 while (act <= end) { 540 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 541 " CCW %p: %08X %08X DAT:", 542 act, ((int *) act)[0], ((int *) act)[1]); 543 for (count = 0; count < 32 && count < act->count; 544 count += sizeof(int)) 545 len += sprintf(page + len, " %08X", 546 ((int *) (addr_t) act->cda) 547 [(count>>2)]); 548 len += sprintf(page + len, "\n"); 549 act++; 550 } 551 552 /* print last CCWs */ 553 if (act < last - 2) { 554 act = last - 2; 555 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 556 } 557 while (act <= last) { 558 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 559 " CCW %p: %08X %08X DAT:", 560 act, ((int *) act)[0], ((int *) act)[1]); 561 for (count = 0; count < 32 && count < act->count; 562 count += sizeof(int)) 563 len += sprintf(page + len, " %08X", 564 ((int *) (addr_t) act->cda) 565 [(count>>2)]); 566 len += sprintf(page + len, "\n"); 567 act++; 568 } 569 if (len > 0) 570 printk(KERN_ERR "%s", page); 571 free_page((unsigned long) page); 572 } 573 574 /* 575 * max_blocks is dependent on the amount of storage that is available 576 * in the static io buffer for each device. Currently each device has 577 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has 578 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use 579 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In 580 * addition we have one define extent ccw + 16 bytes of data and a 581 * locate record ccw for each block (stupid devices!) + 16 bytes of data. 582 * That makes: 583 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum. 584 * We want to fit two into the available memory so that we can immediately 585 * start the next request if one finishes off. That makes 100.1 blocks 586 * for one request. Give a little safety and the result is 96. 587 */ 588 static struct dasd_discipline dasd_fba_discipline = { 589 .owner = THIS_MODULE, 590 .name = "FBA ", 591 .ebcname = "FBA ", 592 .max_blocks = 96, 593 .check_device = dasd_fba_check_characteristics, 594 .do_analysis = dasd_fba_do_analysis, 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 .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt, 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