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 38MODULE_LICENSE("GPL"); 39 40static struct dasd_discipline dasd_fba_discipline; 41 42struct dasd_fba_private { 43 struct dasd_fba_characteristics rdc_data; 44}; 45 46static 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 52MODULE_DEVICE_TABLE(ccw, dasd_fba_ids); 53 54static struct ccw_driver dasd_fba_driver; /* see below */ 55static int 56dasd_fba_probe(struct ccw_device *cdev) 57{ 58 return dasd_generic_probe(cdev, &dasd_fba_discipline); 59} 60 61static int 62dasd_fba_set_online(struct ccw_device *cdev) 63{ 64 return dasd_generic_set_online(cdev, &dasd_fba_discipline); 65} 66 67static struct ccw_driver dasd_fba_driver = { 68 .driver = { 69 .name = "dasd-fba", 70 .owner = THIS_MODULE, 71 }, 72 .ids = dasd_fba_ids, 73 .probe = dasd_fba_probe, 74 .remove = dasd_generic_remove, 75 .set_offline = dasd_generic_set_offline, 76 .set_online = dasd_fba_set_online, 77 .notify = dasd_generic_notify, 78 .path_event = dasd_generic_path_event, 79 .freeze = dasd_generic_pm_freeze, 80 .thaw = dasd_generic_restore_device, 81 .restore = dasd_generic_restore_device, 82 .int_class = IOINT_DAS, 83}; 84 85static void 86define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw, 87 int blksize, int beg, int nr) 88{ 89 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT; 90 ccw->flags = 0; 91 ccw->count = 16; 92 ccw->cda = (__u32) __pa(data); 93 memset(data, 0, sizeof (struct DE_fba_data)); 94 if (rw == WRITE) 95 (data->mask).perm = 0x0; 96 else if (rw == READ) 97 (data->mask).perm = 0x1; 98 else 99 data->mask.perm = 0x2; 100 data->blk_size = blksize; 101 data->ext_loc = beg; 102 data->ext_end = nr - 1; 103} 104 105static void 106locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw, 107 int block_nr, int block_ct) 108{ 109 ccw->cmd_code = DASD_FBA_CCW_LOCATE; 110 ccw->flags = 0; 111 ccw->count = 8; 112 ccw->cda = (__u32) __pa(data); 113 memset(data, 0, sizeof (struct LO_fba_data)); 114 if (rw == WRITE) 115 data->operation.cmd = 0x5; 116 else if (rw == READ) 117 data->operation.cmd = 0x6; 118 else 119 data->operation.cmd = 0x8; 120 data->blk_nr = block_nr; 121 data->blk_ct = block_ct; 122} 123 124static int 125dasd_fba_check_characteristics(struct dasd_device *device) 126{ 127 struct dasd_block *block; 128 struct dasd_fba_private *private; 129 struct ccw_device *cdev = device->cdev; 130 int rc; 131 int readonly; 132 133 private = (struct dasd_fba_private *) device->private; 134 if (!private) { 135 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); 136 if (!private) { 137 dev_warn(&device->cdev->dev, 138 "Allocating memory for private DASD " 139 "data failed\n"); 140 return -ENOMEM; 141 } 142 device->private = (void *) private; 143 } else { 144 memset(private, 0, sizeof(*private)); 145 } 146 block = dasd_alloc_block(); 147 if (IS_ERR(block)) { 148 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate " 149 "dasd block structure"); 150 device->private = NULL; 151 kfree(private); 152 return PTR_ERR(block); 153 } 154 device->block = block; 155 block->base = device; 156 157 /* Read Device Characteristics */ 158 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC, 159 &private->rdc_data, 32); 160 if (rc) { 161 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device " 162 "characteristics returned error %d", rc); 163 device->block = NULL; 164 dasd_free_block(block); 165 device->private = NULL; 166 kfree(private); 167 return rc; 168 } 169 170 device->default_expires = DASD_EXPIRES; 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 191static int dasd_fba_do_analysis(struct dasd_block *block) 192{ 193 struct dasd_fba_private *private; 194 int sb, rc; 195 196 private = (struct dasd_fba_private *) block->base->private; 197 rc = dasd_check_blocksize(private->rdc_data.blk_size); 198 if (rc) { 199 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d", 200 private->rdc_data.blk_size); 201 return rc; 202 } 203 block->blocks = private->rdc_data.blk_bdsa; 204 block->bp_block = private->rdc_data.blk_size; 205 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 206 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) 207 block->s2b_shift++; 208 return 0; 209} 210 211static int dasd_fba_fill_geometry(struct dasd_block *block, 212 struct hd_geometry *geo) 213{ 214 if (dasd_check_blocksize(block->bp_block) != 0) 215 return -EINVAL; 216 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 217 geo->heads = 16; 218 geo->sectors = 128 >> block->s2b_shift; 219 return 0; 220} 221 222static dasd_erp_fn_t 223dasd_fba_erp_action(struct dasd_ccw_req * cqr) 224{ 225 return dasd_default_erp_action; 226} 227 228static dasd_erp_fn_t 229dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) 230{ 231 if (cqr->function == dasd_default_erp_action) 232 return dasd_default_erp_postaction; 233 234 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p", 235 cqr->function); 236 return NULL; 237} 238 239static void dasd_fba_check_for_device_change(struct dasd_device *device, 240 struct dasd_ccw_req *cqr, 241 struct irb *irb) 242{ 243 char mask; 244 245 /* first of all check for state change pending interrupt */ 246 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; 247 if ((irb->scsw.cmd.dstat & mask) == mask) 248 dasd_generic_handle_state_change(device); 249}; 250 251static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev, 252 struct dasd_block *block, 253 struct request *req) 254{ 255 struct dasd_fba_private *private; 256 unsigned long *idaws; 257 struct LO_fba_data *LO_data; 258 struct dasd_ccw_req *cqr; 259 struct ccw1 *ccw; 260 struct req_iterator iter; 261 struct bio_vec *bv; 262 char *dst; 263 int count, cidaw, cplength, datasize; 264 sector_t recid, first_rec, last_rec; 265 unsigned int blksize, off; 266 unsigned char cmd; 267 268 private = (struct dasd_fba_private *) block->base->private; 269 if (rq_data_dir(req) == READ) { 270 cmd = DASD_FBA_CCW_READ; 271 } else if (rq_data_dir(req) == WRITE) { 272 cmd = DASD_FBA_CCW_WRITE; 273 } else 274 return ERR_PTR(-EINVAL); 275 blksize = block->bp_block; 276 /* Calculate record id of first and last block. */ 277 first_rec = blk_rq_pos(req) >> block->s2b_shift; 278 last_rec = 279 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 280 /* Check struct bio and count the number of blocks for the request. */ 281 count = 0; 282 cidaw = 0; 283 rq_for_each_segment(bv, req, iter) { 284 if (bv->bv_len & (blksize - 1)) 285 /* Fba can only do full blocks. */ 286 return ERR_PTR(-EINVAL); 287 count += bv->bv_len >> (block->s2b_shift + 9); 288#if defined(CONFIG_64BIT) 289 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len)) 290 cidaw += bv->bv_len / blksize; 291#endif 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 = 32; 374 cqr->buildclk = get_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 cqr->status = DASD_CQR_FILLED; 430}; 431 432static int 433dasd_fba_fill_info(struct dasd_device * device, 434 struct dasd_information2_t * info) 435{ 436 info->label_block = 1; 437 info->FBA_layout = 1; 438 info->format = DASD_FORMAT_LDL; 439 info->characteristics_size = sizeof(struct dasd_fba_characteristics); 440 memcpy(info->characteristics, 441 &((struct dasd_fba_private *) device->private)->rdc_data, 442 sizeof (struct dasd_fba_characteristics)); 443 info->confdata_size = 0; 444 return 0; 445} 446 447static void 448dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb, 449 char *reason) 450{ 451 u64 *sense; 452 453 sense = (u64 *) dasd_get_sense(irb); 454 if (sense) { 455 DBF_DEV_EVENT(DBF_EMERG, device, 456 "%s: %s %02x%02x%02x %016llx %016llx %016llx " 457 "%016llx", reason, 458 scsw_is_tm(&irb->scsw) ? "t" : "c", 459 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw), 460 scsw_dstat(&irb->scsw), sense[0], sense[1], 461 sense[2], sense[3]); 462 } else { 463 DBF_DEV_EVENT(DBF_EMERG, device, "%s", 464 "SORRY - NO VALID SENSE AVAILABLE\n"); 465 } 466} 467 468 469static void 470dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 471 struct irb *irb) 472{ 473 char *page; 474 struct ccw1 *act, *end, *last; 475 int len, sl, sct, count; 476 477 page = (char *) get_zeroed_page(GFP_ATOMIC); 478 if (page == NULL) { 479 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 480 "No memory to dump sense data"); 481 return; 482 } 483 len = sprintf(page, KERN_ERR PRINTK_HEADER 484 " I/O status report for device %s:\n", 485 dev_name(&device->cdev->dev)); 486 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 487 " in req: %p CS: 0x%02X DS: 0x%02X\n", req, 488 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat); 489 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 490 " device %s: Failing CCW: %p\n", 491 dev_name(&device->cdev->dev), 492 (void *) (addr_t) irb->scsw.cmd.cpa); 493 if (irb->esw.esw0.erw.cons) { 494 for (sl = 0; sl < 4; sl++) { 495 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 496 " Sense(hex) %2d-%2d:", 497 (8 * sl), ((8 * sl) + 7)); 498 499 for (sct = 0; sct < 8; sct++) { 500 len += sprintf(page + len, " %02x", 501 irb->ecw[8 * sl + sct]); 502 } 503 len += sprintf(page + len, "\n"); 504 } 505 } else { 506 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 507 " SORRY - NO VALID SENSE AVAILABLE\n"); 508 } 509 printk(KERN_ERR "%s", page); 510 511 /* dump the Channel Program */ 512 /* print first CCWs (maximum 8) */ 513 act = req->cpaddr; 514 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); 515 end = min(act + 8, last); 516 len = sprintf(page, KERN_ERR PRINTK_HEADER 517 " Related CP in req: %p\n", req); 518 while (act <= end) { 519 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 520 " CCW %p: %08X %08X DAT:", 521 act, ((int *) act)[0], ((int *) act)[1]); 522 for (count = 0; count < 32 && count < act->count; 523 count += sizeof(int)) 524 len += sprintf(page + len, " %08X", 525 ((int *) (addr_t) act->cda) 526 [(count>>2)]); 527 len += sprintf(page + len, "\n"); 528 act++; 529 } 530 printk(KERN_ERR "%s", page); 531 532 533 /* print failing CCW area */ 534 len = 0; 535 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { 536 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; 537 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 538 } 539 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); 540 while (act <= end) { 541 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 542 " CCW %p: %08X %08X DAT:", 543 act, ((int *) act)[0], ((int *) act)[1]); 544 for (count = 0; count < 32 && count < act->count; 545 count += sizeof(int)) 546 len += sprintf(page + len, " %08X", 547 ((int *) (addr_t) act->cda) 548 [(count>>2)]); 549 len += sprintf(page + len, "\n"); 550 act++; 551 } 552 553 /* print last CCWs */ 554 if (act < last - 2) { 555 act = last - 2; 556 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 557 } 558 while (act <= last) { 559 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 560 " CCW %p: %08X %08X DAT:", 561 act, ((int *) act)[0], ((int *) act)[1]); 562 for (count = 0; count < 32 && count < act->count; 563 count += sizeof(int)) 564 len += sprintf(page + len, " %08X", 565 ((int *) (addr_t) act->cda) 566 [(count>>2)]); 567 len += sprintf(page + len, "\n"); 568 act++; 569 } 570 if (len > 0) 571 printk(KERN_ERR "%s", page); 572 free_page((unsigned long) page); 573} 574 575/* 576 * max_blocks is dependent on the amount of storage that is available 577 * in the static io buffer for each device. Currently each device has 578 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has 579 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use 580 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In 581 * addition we have one define extent ccw + 16 bytes of data and a 582 * locate record ccw for each block (stupid devices!) + 16 bytes of data. 583 * That makes: 584 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum. 585 * We want to fit two into the available memory so that we can immediately 586 * start the next request if one finishes off. That makes 100.1 blocks 587 * for one request. Give a little safety and the result is 96. 588 */ 589static struct dasd_discipline dasd_fba_discipline = { 590 .owner = THIS_MODULE, 591 .name = "FBA ", 592 .ebcname = "FBA ", 593 .max_blocks = 96, 594 .check_device = dasd_fba_check_characteristics, 595 .do_analysis = dasd_fba_do_analysis, 596 .verify_path = dasd_generic_verify_path, 597 .fill_geometry = dasd_fba_fill_geometry, 598 .start_IO = dasd_start_IO, 599 .term_IO = dasd_term_IO, 600 .handle_terminated_request = dasd_fba_handle_terminated_request, 601 .erp_action = dasd_fba_erp_action, 602 .erp_postaction = dasd_fba_erp_postaction, 603 .check_for_device_change = dasd_fba_check_for_device_change, 604 .build_cp = dasd_fba_build_cp, 605 .free_cp = dasd_fba_free_cp, 606 .dump_sense = dasd_fba_dump_sense, 607 .dump_sense_dbf = dasd_fba_dump_sense_dbf, 608 .fill_info = dasd_fba_fill_info, 609}; 610 611static int __init 612dasd_fba_init(void) 613{ 614 int ret; 615 616 ASCEBC(dasd_fba_discipline.ebcname, 4); 617 ret = ccw_driver_register(&dasd_fba_driver); 618 if (!ret) 619 wait_for_device_probe(); 620 621 return ret; 622} 623 624static void __exit 625dasd_fba_cleanup(void) 626{ 627 ccw_driver_unregister(&dasd_fba_driver); 628} 629 630module_init(dasd_fba_init); 631module_exit(dasd_fba_cleanup); 632