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