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 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 6 * 7 */ 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/todclk.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 }; 77 78 static void 79 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw, 80 int blksize, int beg, int nr) 81 { 82 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT; 83 ccw->flags = 0; 84 ccw->count = 16; 85 ccw->cda = (__u32) __pa(data); 86 memset(data, 0, sizeof (struct DE_fba_data)); 87 if (rw == WRITE) 88 (data->mask).perm = 0x0; 89 else if (rw == READ) 90 (data->mask).perm = 0x1; 91 else 92 data->mask.perm = 0x2; 93 data->blk_size = blksize; 94 data->ext_loc = beg; 95 data->ext_end = nr - 1; 96 } 97 98 static void 99 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw, 100 int block_nr, int block_ct) 101 { 102 ccw->cmd_code = DASD_FBA_CCW_LOCATE; 103 ccw->flags = 0; 104 ccw->count = 8; 105 ccw->cda = (__u32) __pa(data); 106 memset(data, 0, sizeof (struct LO_fba_data)); 107 if (rw == WRITE) 108 data->operation.cmd = 0x5; 109 else if (rw == READ) 110 data->operation.cmd = 0x6; 111 else 112 data->operation.cmd = 0x8; 113 data->blk_nr = block_nr; 114 data->blk_ct = block_ct; 115 } 116 117 static int 118 dasd_fba_check_characteristics(struct dasd_device *device) 119 { 120 struct dasd_block *block; 121 struct dasd_fba_private *private; 122 struct ccw_device *cdev = device->cdev; 123 void *rdc_data; 124 int rc; 125 126 private = (struct dasd_fba_private *) device->private; 127 if (private == NULL) { 128 private = kzalloc(sizeof(struct dasd_fba_private), 129 GFP_KERNEL | GFP_DMA); 130 if (private == NULL) { 131 DEV_MESSAGE(KERN_WARNING, device, "%s", 132 "memory allocation failed for private " 133 "data"); 134 return -ENOMEM; 135 } 136 device->private = (void *) private; 137 } 138 block = dasd_alloc_block(); 139 if (IS_ERR(block)) { 140 DEV_MESSAGE(KERN_WARNING, device, "%s", 141 "could not allocate dasd block structure"); 142 device->private = NULL; 143 kfree(private); 144 return PTR_ERR(block); 145 } 146 device->block = block; 147 block->base = device; 148 149 /* Read Device Characteristics */ 150 rdc_data = (void *) &(private->rdc_data); 151 rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32); 152 if (rc) { 153 DEV_MESSAGE(KERN_WARNING, device, 154 "Read device characteristics returned error %d", 155 rc); 156 device->block = NULL; 157 dasd_free_block(block); 158 device->private = NULL; 159 kfree(private); 160 return rc; 161 } 162 163 DEV_MESSAGE(KERN_INFO, device, 164 "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)", 165 cdev->id.dev_type, 166 cdev->id.dev_model, 167 cdev->id.cu_type, 168 cdev->id.cu_model, 169 ((private->rdc_data.blk_bdsa * 170 (private->rdc_data.blk_size >> 9)) >> 11), 171 private->rdc_data.blk_size); 172 return 0; 173 } 174 175 static int dasd_fba_do_analysis(struct dasd_block *block) 176 { 177 struct dasd_fba_private *private; 178 int sb, rc; 179 180 private = (struct dasd_fba_private *) block->base->private; 181 rc = dasd_check_blocksize(private->rdc_data.blk_size); 182 if (rc) { 183 DEV_MESSAGE(KERN_INFO, block->base, "unknown blocksize %d", 184 private->rdc_data.blk_size); 185 return rc; 186 } 187 block->blocks = private->rdc_data.blk_bdsa; 188 block->bp_block = private->rdc_data.blk_size; 189 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 190 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) 191 block->s2b_shift++; 192 return 0; 193 } 194 195 static int dasd_fba_fill_geometry(struct dasd_block *block, 196 struct hd_geometry *geo) 197 { 198 if (dasd_check_blocksize(block->bp_block) != 0) 199 return -EINVAL; 200 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 201 geo->heads = 16; 202 geo->sectors = 128 >> block->s2b_shift; 203 return 0; 204 } 205 206 static dasd_erp_fn_t 207 dasd_fba_erp_action(struct dasd_ccw_req * cqr) 208 { 209 return dasd_default_erp_action; 210 } 211 212 static dasd_erp_fn_t 213 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) 214 { 215 if (cqr->function == dasd_default_erp_action) 216 return dasd_default_erp_postaction; 217 218 DEV_MESSAGE(KERN_WARNING, cqr->startdev, "unknown ERP action %p", 219 cqr->function); 220 return NULL; 221 } 222 223 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device, 224 struct irb *irb) 225 { 226 char mask; 227 228 /* first of all check for state change pending interrupt */ 229 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; 230 if ((irb->scsw.cmd.dstat & mask) == mask) { 231 dasd_generic_handle_state_change(device); 232 return; 233 } 234 235 /* check for unsolicited interrupts */ 236 DEV_MESSAGE(KERN_DEBUG, device, "%s", 237 "unsolicited interrupt received"); 238 device->discipline->dump_sense(device, NULL, irb); 239 dasd_schedule_device_bh(device); 240 return; 241 }; 242 243 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev, 244 struct dasd_block *block, 245 struct request *req) 246 { 247 struct dasd_fba_private *private; 248 unsigned long *idaws; 249 struct LO_fba_data *LO_data; 250 struct dasd_ccw_req *cqr; 251 struct ccw1 *ccw; 252 struct req_iterator iter; 253 struct bio_vec *bv; 254 char *dst; 255 int count, cidaw, cplength, datasize; 256 sector_t recid, first_rec, last_rec; 257 unsigned int blksize, off; 258 unsigned char cmd; 259 260 private = (struct dasd_fba_private *) block->base->private; 261 if (rq_data_dir(req) == READ) { 262 cmd = DASD_FBA_CCW_READ; 263 } else if (rq_data_dir(req) == WRITE) { 264 cmd = DASD_FBA_CCW_WRITE; 265 } else 266 return ERR_PTR(-EINVAL); 267 blksize = block->bp_block; 268 /* Calculate record id of first and last block. */ 269 first_rec = req->sector >> block->s2b_shift; 270 last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift; 271 /* Check struct bio and count the number of blocks for the request. */ 272 count = 0; 273 cidaw = 0; 274 rq_for_each_segment(bv, req, iter) { 275 if (bv->bv_len & (blksize - 1)) 276 /* Fba can only do full blocks. */ 277 return ERR_PTR(-EINVAL); 278 count += bv->bv_len >> (block->s2b_shift + 9); 279 #if defined(CONFIG_64BIT) 280 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len)) 281 cidaw += bv->bv_len / blksize; 282 #endif 283 } 284 /* Paranoia. */ 285 if (count != last_rec - first_rec + 1) 286 return ERR_PTR(-EINVAL); 287 /* 1x define extent + 1x locate record + number of blocks */ 288 cplength = 2 + count; 289 /* 1x define extent + 1x locate record */ 290 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) + 291 cidaw * sizeof(unsigned long); 292 /* 293 * Find out number of additional locate record ccws if the device 294 * can't do data chaining. 295 */ 296 if (private->rdc_data.mode.bits.data_chain == 0) { 297 cplength += count - 1; 298 datasize += (count - 1)*sizeof(struct LO_fba_data); 299 } 300 /* Allocate the ccw request. */ 301 cqr = dasd_smalloc_request(dasd_fba_discipline.name, 302 cplength, datasize, memdev); 303 if (IS_ERR(cqr)) 304 return cqr; 305 ccw = cqr->cpaddr; 306 /* First ccw is define extent. */ 307 define_extent(ccw++, cqr->data, rq_data_dir(req), 308 block->bp_block, req->sector, req->nr_sectors); 309 /* Build locate_record + read/write ccws. */ 310 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data)); 311 LO_data = (struct LO_fba_data *) (idaws + cidaw); 312 /* Locate record for all blocks for smart devices. */ 313 if (private->rdc_data.mode.bits.data_chain != 0) { 314 ccw[-1].flags |= CCW_FLAG_CC; 315 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count); 316 } 317 recid = first_rec; 318 rq_for_each_segment(bv, req, iter) { 319 dst = page_address(bv->bv_page) + bv->bv_offset; 320 if (dasd_page_cache) { 321 char *copy = kmem_cache_alloc(dasd_page_cache, 322 GFP_DMA | __GFP_NOWARN); 323 if (copy && rq_data_dir(req) == WRITE) 324 memcpy(copy + bv->bv_offset, dst, bv->bv_len); 325 if (copy) 326 dst = copy + bv->bv_offset; 327 } 328 for (off = 0; off < bv->bv_len; off += blksize) { 329 /* Locate record for stupid devices. */ 330 if (private->rdc_data.mode.bits.data_chain == 0) { 331 ccw[-1].flags |= CCW_FLAG_CC; 332 locate_record(ccw, LO_data++, 333 rq_data_dir(req), 334 recid - first_rec, 1); 335 ccw->flags = CCW_FLAG_CC; 336 ccw++; 337 } else { 338 if (recid > first_rec) 339 ccw[-1].flags |= CCW_FLAG_DC; 340 else 341 ccw[-1].flags |= CCW_FLAG_CC; 342 } 343 ccw->cmd_code = cmd; 344 ccw->count = block->bp_block; 345 if (idal_is_needed(dst, blksize)) { 346 ccw->cda = (__u32)(addr_t) idaws; 347 ccw->flags = CCW_FLAG_IDA; 348 idaws = idal_create_words(idaws, dst, blksize); 349 } else { 350 ccw->cda = (__u32)(addr_t) dst; 351 ccw->flags = 0; 352 } 353 ccw++; 354 dst += blksize; 355 recid++; 356 } 357 } 358 if (blk_noretry_request(req)) 359 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 360 cqr->startdev = memdev; 361 cqr->memdev = memdev; 362 cqr->block = block; 363 cqr->expires = 5 * 60 * HZ; /* 5 minutes */ 364 cqr->retries = 32; 365 cqr->buildclk = get_clock(); 366 cqr->status = DASD_CQR_FILLED; 367 return cqr; 368 } 369 370 static int 371 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req) 372 { 373 struct dasd_fba_private *private; 374 struct ccw1 *ccw; 375 struct req_iterator iter; 376 struct bio_vec *bv; 377 char *dst, *cda; 378 unsigned int blksize, off; 379 int status; 380 381 if (!dasd_page_cache) 382 goto out; 383 private = (struct dasd_fba_private *) cqr->block->base->private; 384 blksize = cqr->block->bp_block; 385 ccw = cqr->cpaddr; 386 /* Skip over define extent & locate record. */ 387 ccw++; 388 if (private->rdc_data.mode.bits.data_chain != 0) 389 ccw++; 390 rq_for_each_segment(bv, req, iter) { 391 dst = page_address(bv->bv_page) + bv->bv_offset; 392 for (off = 0; off < bv->bv_len; off += blksize) { 393 /* Skip locate record. */ 394 if (private->rdc_data.mode.bits.data_chain == 0) 395 ccw++; 396 if (dst) { 397 if (ccw->flags & CCW_FLAG_IDA) 398 cda = *((char **)((addr_t) ccw->cda)); 399 else 400 cda = (char *)((addr_t) ccw->cda); 401 if (dst != cda) { 402 if (rq_data_dir(req) == READ) 403 memcpy(dst, cda, bv->bv_len); 404 kmem_cache_free(dasd_page_cache, 405 (void *)((addr_t)cda & PAGE_MASK)); 406 } 407 dst = NULL; 408 } 409 ccw++; 410 } 411 } 412 out: 413 status = cqr->status == DASD_CQR_DONE; 414 dasd_sfree_request(cqr, cqr->memdev); 415 return status; 416 } 417 418 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr) 419 { 420 cqr->status = DASD_CQR_FILLED; 421 }; 422 423 static int 424 dasd_fba_fill_info(struct dasd_device * device, 425 struct dasd_information2_t * info) 426 { 427 info->label_block = 1; 428 info->FBA_layout = 1; 429 info->format = DASD_FORMAT_LDL; 430 info->characteristics_size = sizeof(struct dasd_fba_characteristics); 431 memcpy(info->characteristics, 432 &((struct dasd_fba_private *) device->private)->rdc_data, 433 sizeof (struct dasd_fba_characteristics)); 434 info->confdata_size = 0; 435 return 0; 436 } 437 438 static void 439 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 440 struct irb *irb) 441 { 442 char *page; 443 struct ccw1 *act, *end, *last; 444 int len, sl, sct, count; 445 446 page = (char *) get_zeroed_page(GFP_ATOMIC); 447 if (page == NULL) { 448 DEV_MESSAGE(KERN_ERR, device, " %s", 449 "No memory to dump sense data"); 450 return; 451 } 452 len = sprintf(page, KERN_ERR PRINTK_HEADER 453 " I/O status report for device %s:\n", 454 dev_name(&device->cdev->dev)); 455 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 456 " in req: %p CS: 0x%02X DS: 0x%02X\n", req, 457 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat); 458 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 459 " device %s: Failing CCW: %p\n", 460 dev_name(&device->cdev->dev), 461 (void *) (addr_t) irb->scsw.cmd.cpa); 462 if (irb->esw.esw0.erw.cons) { 463 for (sl = 0; sl < 4; sl++) { 464 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 465 " Sense(hex) %2d-%2d:", 466 (8 * sl), ((8 * sl) + 7)); 467 468 for (sct = 0; sct < 8; sct++) { 469 len += sprintf(page + len, " %02x", 470 irb->ecw[8 * sl + sct]); 471 } 472 len += sprintf(page + len, "\n"); 473 } 474 } else { 475 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 476 " SORRY - NO VALID SENSE AVAILABLE\n"); 477 } 478 MESSAGE_LOG(KERN_ERR, "%s", 479 page + sizeof(KERN_ERR PRINTK_HEADER)); 480 481 /* dump the Channel Program */ 482 /* print first CCWs (maximum 8) */ 483 act = req->cpaddr; 484 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); 485 end = min(act + 8, last); 486 len = sprintf(page, KERN_ERR PRINTK_HEADER 487 " Related CP in req: %p\n", req); 488 while (act <= end) { 489 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 490 " CCW %p: %08X %08X DAT:", 491 act, ((int *) act)[0], ((int *) act)[1]); 492 for (count = 0; count < 32 && count < act->count; 493 count += sizeof(int)) 494 len += sprintf(page + len, " %08X", 495 ((int *) (addr_t) act->cda) 496 [(count>>2)]); 497 len += sprintf(page + len, "\n"); 498 act++; 499 } 500 MESSAGE_LOG(KERN_ERR, "%s", 501 page + sizeof(KERN_ERR PRINTK_HEADER)); 502 503 504 /* print failing CCW area */ 505 len = 0; 506 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { 507 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; 508 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 509 } 510 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); 511 while (act <= end) { 512 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 513 " CCW %p: %08X %08X DAT:", 514 act, ((int *) act)[0], ((int *) act)[1]); 515 for (count = 0; count < 32 && count < act->count; 516 count += sizeof(int)) 517 len += sprintf(page + len, " %08X", 518 ((int *) (addr_t) act->cda) 519 [(count>>2)]); 520 len += sprintf(page + len, "\n"); 521 act++; 522 } 523 524 /* print last CCWs */ 525 if (act < last - 2) { 526 act = last - 2; 527 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n"); 528 } 529 while (act <= last) { 530 len += sprintf(page + len, KERN_ERR PRINTK_HEADER 531 " CCW %p: %08X %08X DAT:", 532 act, ((int *) act)[0], ((int *) act)[1]); 533 for (count = 0; count < 32 && count < act->count; 534 count += sizeof(int)) 535 len += sprintf(page + len, " %08X", 536 ((int *) (addr_t) act->cda) 537 [(count>>2)]); 538 len += sprintf(page + len, "\n"); 539 act++; 540 } 541 if (len > 0) 542 MESSAGE_LOG(KERN_ERR, "%s", 543 page + sizeof(KERN_ERR PRINTK_HEADER)); 544 free_page((unsigned long) page); 545 } 546 547 /* 548 * max_blocks is dependent on the amount of storage that is available 549 * in the static io buffer for each device. Currently each device has 550 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has 551 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use 552 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In 553 * addition we have one define extent ccw + 16 bytes of data and a 554 * locate record ccw for each block (stupid devices!) + 16 bytes of data. 555 * That makes: 556 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum. 557 * We want to fit two into the available memory so that we can immediately 558 * start the next request if one finishes off. That makes 100.1 blocks 559 * for one request. Give a little safety and the result is 96. 560 */ 561 static struct dasd_discipline dasd_fba_discipline = { 562 .owner = THIS_MODULE, 563 .name = "FBA ", 564 .ebcname = "FBA ", 565 .max_blocks = 96, 566 .check_device = dasd_fba_check_characteristics, 567 .do_analysis = dasd_fba_do_analysis, 568 .fill_geometry = dasd_fba_fill_geometry, 569 .start_IO = dasd_start_IO, 570 .term_IO = dasd_term_IO, 571 .handle_terminated_request = dasd_fba_handle_terminated_request, 572 .erp_action = dasd_fba_erp_action, 573 .erp_postaction = dasd_fba_erp_postaction, 574 .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt, 575 .build_cp = dasd_fba_build_cp, 576 .free_cp = dasd_fba_free_cp, 577 .dump_sense = dasd_fba_dump_sense, 578 .fill_info = dasd_fba_fill_info, 579 }; 580 581 static int __init 582 dasd_fba_init(void) 583 { 584 ASCEBC(dasd_fba_discipline.ebcname, 4); 585 return ccw_driver_register(&dasd_fba_driver); 586 } 587 588 static void __exit 589 dasd_fba_cleanup(void) 590 { 591 ccw_driver_unregister(&dasd_fba_driver); 592 } 593 594 module_init(dasd_fba_init); 595 module_exit(dasd_fba_cleanup); 596