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 .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 .freeze = dasd_generic_pm_freeze, 77 .thaw = dasd_generic_restore_device, 78 .restore = dasd_generic_restore_device, 79}; 80 81static void 82define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw, 83 int blksize, int beg, int nr) 84{ 85 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT; 86 ccw->flags = 0; 87 ccw->count = 16; 88 ccw->cda = (__u32) __pa(data); 89 memset(data, 0, sizeof (struct DE_fba_data)); 90 if (rw == WRITE) 91 (data->mask).perm = 0x0; 92 else if (rw == READ) 93 (data->mask).perm = 0x1; 94 else 95 data->mask.perm = 0x2; 96 data->blk_size = blksize; 97 data->ext_loc = beg; 98 data->ext_end = nr - 1; 99} 100 101static void 102locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw, 103 int block_nr, int block_ct) 104{ 105 ccw->cmd_code = DASD_FBA_CCW_LOCATE; 106 ccw->flags = 0; 107 ccw->count = 8; 108 ccw->cda = (__u32) __pa(data); 109 memset(data, 0, sizeof (struct LO_fba_data)); 110 if (rw == WRITE) 111 data->operation.cmd = 0x5; 112 else if (rw == READ) 113 data->operation.cmd = 0x6; 114 else 115 data->operation.cmd = 0x8; 116 data->blk_nr = block_nr; 117 data->blk_ct = block_ct; 118} 119 120static int 121dasd_fba_check_characteristics(struct dasd_device *device) 122{ 123 struct dasd_block *block; 124 struct dasd_fba_private *private; 125 struct ccw_device *cdev = device->cdev; 126 int rc; 127 int readonly; 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_DEVID(DBF_WARNING, cdev, "%s", "could not allocate " 145 "dasd block structure"); 146 device->private = NULL; 147 kfree(private); 148 return PTR_ERR(block); 149 } 150 device->block = block; 151 block->base = device; 152 153 /* Read Device Characteristics */ 154 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC, 155 &private->rdc_data, 32); 156 if (rc) { 157 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device " 158 "characteristics returned error %d", rc); 159 device->block = NULL; 160 dasd_free_block(block); 161 device->private = NULL; 162 kfree(private); 163 return rc; 164 } 165 166 device->default_expires = DASD_EXPIRES; 167 168 readonly = dasd_device_is_ro(device); 169 if (readonly) 170 set_bit(DASD_FLAG_DEVICE_RO, &device->flags); 171 172 dev_info(&device->cdev->dev, 173 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB " 174 "and %d B/blk%s\n", 175 cdev->id.dev_type, 176 cdev->id.dev_model, 177 cdev->id.cu_type, 178 cdev->id.cu_model, 179 ((private->rdc_data.blk_bdsa * 180 (private->rdc_data.blk_size >> 9)) >> 11), 181 private->rdc_data.blk_size, 182 readonly ? ", read-only device" : ""); 183 return 0; 184} 185 186static int dasd_fba_do_analysis(struct dasd_block *block) 187{ 188 struct dasd_fba_private *private; 189 int sb, rc; 190 191 private = (struct dasd_fba_private *) block->base->private; 192 rc = dasd_check_blocksize(private->rdc_data.blk_size); 193 if (rc) { 194 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d", 195 private->rdc_data.blk_size); 196 return rc; 197 } 198 block->blocks = private->rdc_data.blk_bdsa; 199 block->bp_block = private->rdc_data.blk_size; 200 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 201 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) 202 block->s2b_shift++; 203 return 0; 204} 205 206static int dasd_fba_fill_geometry(struct dasd_block *block, 207 struct hd_geometry *geo) 208{ 209 if (dasd_check_blocksize(block->bp_block) != 0) 210 return -EINVAL; 211 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 212 geo->heads = 16; 213 geo->sectors = 128 >> block->s2b_shift; 214 return 0; 215} 216 217static dasd_erp_fn_t 218dasd_fba_erp_action(struct dasd_ccw_req * cqr) 219{ 220 return dasd_default_erp_action; 221} 222 223static dasd_erp_fn_t 224dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) 225{ 226 if (cqr->function == dasd_default_erp_action) 227 return dasd_default_erp_postaction; 228 229 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p", 230 cqr->function); 231 return NULL; 232} 233 234static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device, 235 struct irb *irb) 236{ 237 char mask; 238 239 /* first of all check for state change pending interrupt */ 240 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; 241 if ((irb->scsw.cmd.dstat & mask) == mask) { 242 dasd_generic_handle_state_change(device); 243 return; 244 } 245 246 /* check for unsolicited interrupts */ 247 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 248 "unsolicited interrupt received"); 249 device->discipline->dump_sense_dbf(device, irb, "unsolicited"); 250 dasd_schedule_device_bh(device); 251 return; 252}; 253 254static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev, 255 struct dasd_block *block, 256 struct request *req) 257{ 258 struct dasd_fba_private *private; 259 unsigned long *idaws; 260 struct LO_fba_data *LO_data; 261 struct dasd_ccw_req *cqr; 262 struct ccw1 *ccw; 263 struct req_iterator iter; 264 struct bio_vec *bv; 265 char *dst; 266 int count, cidaw, cplength, datasize; 267 sector_t recid, first_rec, last_rec; 268 unsigned int blksize, off; 269 unsigned char cmd; 270 271 private = (struct dasd_fba_private *) block->base->private; 272 if (rq_data_dir(req) == READ) { 273 cmd = DASD_FBA_CCW_READ; 274 } else if (rq_data_dir(req) == WRITE) { 275 cmd = DASD_FBA_CCW_WRITE; 276 } else 277 return ERR_PTR(-EINVAL); 278 blksize = block->bp_block; 279 /* Calculate record id of first and last block. */ 280 first_rec = blk_rq_pos(req) >> block->s2b_shift; 281 last_rec = 282 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 283 /* Check struct bio and count the number of blocks for the request. */ 284 count = 0; 285 cidaw = 0; 286 rq_for_each_segment(bv, req, iter) { 287 if (bv->bv_len & (blksize - 1)) 288 /* Fba can only do full blocks. */ 289 return ERR_PTR(-EINVAL); 290 count += bv->bv_len >> (block->s2b_shift + 9); 291#if defined(CONFIG_64BIT) 292 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len)) 293 cidaw += bv->bv_len / blksize; 294#endif 295 } 296 /* Paranoia. */ 297 if (count != last_rec - first_rec + 1) 298 return ERR_PTR(-EINVAL); 299 /* 1x define extent + 1x locate record + number of blocks */ 300 cplength = 2 + count; 301 /* 1x define extent + 1x locate record */ 302 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) + 303 cidaw * sizeof(unsigned long); 304 /* 305 * Find out number of additional locate record ccws if the device 306 * can't do data chaining. 307 */ 308 if (private->rdc_data.mode.bits.data_chain == 0) { 309 cplength += count - 1; 310 datasize += (count - 1)*sizeof(struct LO_fba_data); 311 } 312 /* Allocate the ccw request. */ 313 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev); 314 if (IS_ERR(cqr)) 315 return cqr; 316 ccw = cqr->cpaddr; 317 /* First ccw is define extent. */ 318 define_extent(ccw++, cqr->data, rq_data_dir(req), 319 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req)); 320 /* Build locate_record + read/write ccws. */ 321 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data)); 322 LO_data = (struct LO_fba_data *) (idaws + cidaw); 323 /* Locate record for all blocks for smart devices. */ 324 if (private->rdc_data.mode.bits.data_chain != 0) { 325 ccw[-1].flags |= CCW_FLAG_CC; 326 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count); 327 } 328 recid = first_rec; 329 rq_for_each_segment(bv, req, iter) { 330 dst = page_address(bv->bv_page) + bv->bv_offset; 331 if (dasd_page_cache) { 332 char *copy = kmem_cache_alloc(dasd_page_cache, 333 GFP_DMA | __GFP_NOWARN); 334 if (copy && rq_data_dir(req) == WRITE) 335 memcpy(copy + bv->bv_offset, dst, bv->bv_len); 336 if (copy) 337 dst = copy + bv->bv_offset; 338 } 339 for (off = 0; off < bv->bv_len; off += blksize) { 340 /* Locate record for stupid devices. */ 341 if (private->rdc_data.mode.bits.data_chain == 0) { 342 ccw[-1].flags |= CCW_FLAG_CC; 343 locate_record(ccw, LO_data++, 344 rq_data_dir(req), 345 recid - first_rec, 1); 346 ccw->flags = CCW_FLAG_CC; 347 ccw++; 348 } else { 349 if (recid > first_rec) 350 ccw[-1].flags |= CCW_FLAG_DC; 351 else 352 ccw[-1].flags |= CCW_FLAG_CC; 353 } 354 ccw->cmd_code = cmd; 355 ccw->count = block->bp_block; 356 if (idal_is_needed(dst, blksize)) { 357 ccw->cda = (__u32)(addr_t) idaws; 358 ccw->flags = CCW_FLAG_IDA; 359 idaws = idal_create_words(idaws, dst, blksize); 360 } else { 361 ccw->cda = (__u32)(addr_t) dst; 362 ccw->flags = 0; 363 } 364 ccw++; 365 dst += blksize; 366 recid++; 367 } 368 } 369 if (blk_noretry_request(req) || 370 block->base->features & DASD_FEATURE_FAILFAST) 371 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 372 cqr->startdev = memdev; 373 cqr->memdev = memdev; 374 cqr->block = block; 375 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ 376 cqr->retries = 32; 377 cqr->buildclk = get_clock(); 378 cqr->status = DASD_CQR_FILLED; 379 return cqr; 380} 381 382static int 383dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req) 384{ 385 struct dasd_fba_private *private; 386 struct ccw1 *ccw; 387 struct req_iterator iter; 388 struct bio_vec *bv; 389 char *dst, *cda; 390 unsigned int blksize, off; 391 int status; 392 393 if (!dasd_page_cache) 394 goto out; 395 private = (struct dasd_fba_private *) cqr->block->base->private; 396 blksize = cqr->block->bp_block; 397 ccw = cqr->cpaddr; 398 /* Skip over define extent & locate record. */ 399 ccw++; 400 if (private->rdc_data.mode.bits.data_chain != 0) 401 ccw++; 402 rq_for_each_segment(bv, req, iter) { 403 dst = page_address(bv->bv_page) + bv->bv_offset; 404 for (off = 0; off < bv->bv_len; off += blksize) { 405 /* Skip locate record. */ 406 if (private->rdc_data.mode.bits.data_chain == 0) 407 ccw++; 408 if (dst) { 409 if (ccw->flags & CCW_FLAG_IDA) 410 cda = *((char **)((addr_t) ccw->cda)); 411 else 412 cda = (char *)((addr_t) ccw->cda); 413 if (dst != cda) { 414 if (rq_data_dir(req) == READ) 415 memcpy(dst, cda, bv->bv_len); 416 kmem_cache_free(dasd_page_cache, 417 (void *)((addr_t)cda & PAGE_MASK)); 418 } 419 dst = NULL; 420 } 421 ccw++; 422 } 423 } 424out: 425 status = cqr->status == DASD_CQR_DONE; 426 dasd_sfree_request(cqr, cqr->memdev); 427 return status; 428} 429 430static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr) 431{ 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, KERN_ERR PRINTK_HEADER 487 " I/O status report for device %s:\n", 488 dev_name(&device->cdev->dev)); 489 len += sprintf(page + len, KERN_ERR 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, KERN_ERR 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, KERN_ERR 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, KERN_ERR 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, KERN_ERR PRINTK_HEADER 520 " Related CP in req: %p\n", req); 521 while (act <= end) { 522 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 523 " CCW %p: %08X %08X DAT:", 524 act, ((int *) act)[0], ((int *) act)[1]); 525 for (count = 0; count < 32 && count < act->count; 526 count += sizeof(int)) 527 len += sprintf(page + len, " %08X", 528 ((int *) (addr_t) act->cda) 529 [(count>>2)]); 530 len += sprintf(page + len, "\n"); 531 act++; 532 } 533 printk(KERN_ERR "%s", page); 534 535 536 /* print failing CCW area */ 537 len = 0; 538 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { 539 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; 540 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 541 } 542 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); 543 while (act <= end) { 544 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 545 " CCW %p: %08X %08X DAT:", 546 act, ((int *) act)[0], ((int *) act)[1]); 547 for (count = 0; count < 32 && count < act->count; 548 count += sizeof(int)) 549 len += sprintf(page + len, " %08X", 550 ((int *) (addr_t) act->cda) 551 [(count>>2)]); 552 len += sprintf(page + len, "\n"); 553 act++; 554 } 555 556 /* print last CCWs */ 557 if (act < last - 2) { 558 act = last - 2; 559 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 560 } 561 while (act <= last) { 562 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 563 " CCW %p: %08X %08X DAT:", 564 act, ((int *) act)[0], ((int *) act)[1]); 565 for (count = 0; count < 32 && count < act->count; 566 count += sizeof(int)) 567 len += sprintf(page + len, " %08X", 568 ((int *) (addr_t) act->cda) 569 [(count>>2)]); 570 len += sprintf(page + len, "\n"); 571 act++; 572 } 573 if (len > 0) 574 printk(KERN_ERR "%s", page); 575 free_page((unsigned long) page); 576} 577 578/* 579 * max_blocks is dependent on the amount of storage that is available 580 * in the static io buffer for each device. Currently each device has 581 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has 582 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use 583 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In 584 * addition we have one define extent ccw + 16 bytes of data and a 585 * locate record ccw for each block (stupid devices!) + 16 bytes of data. 586 * That makes: 587 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum. 588 * We want to fit two into the available memory so that we can immediately 589 * start the next request if one finishes off. That makes 100.1 blocks 590 * for one request. Give a little safety and the result is 96. 591 */ 592static struct dasd_discipline dasd_fba_discipline = { 593 .owner = THIS_MODULE, 594 .name = "FBA ", 595 .ebcname = "FBA ", 596 .max_blocks = 96, 597 .check_device = dasd_fba_check_characteristics, 598 .do_analysis = dasd_fba_do_analysis, 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 .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt, 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