scsi_sysfs.c revision e881a172dac4d9ea3b2a1540041d872963c269bd
1/* 2 * scsi_sysfs.c 3 * 4 * SCSI sysfs interface routines. 5 * 6 * Created to pull SCSI mid layer sysfs routines into one file. 7 */ 8 9#include <linux/module.h> 10#include <linux/init.h> 11#include <linux/blkdev.h> 12#include <linux/device.h> 13 14#include <scsi/scsi.h> 15#include <scsi/scsi_device.h> 16#include <scsi/scsi_host.h> 17#include <scsi/scsi_tcq.h> 18#include <scsi/scsi_transport.h> 19#include <scsi/scsi_driver.h> 20 21#include "scsi_priv.h" 22#include "scsi_logging.h" 23 24static struct device_type scsi_dev_type; 25 26static const struct { 27 enum scsi_device_state value; 28 char *name; 29} sdev_states[] = { 30 { SDEV_CREATED, "created" }, 31 { SDEV_RUNNING, "running" }, 32 { SDEV_CANCEL, "cancel" }, 33 { SDEV_DEL, "deleted" }, 34 { SDEV_QUIESCE, "quiesce" }, 35 { SDEV_OFFLINE, "offline" }, 36 { SDEV_BLOCK, "blocked" }, 37 { SDEV_CREATED_BLOCK, "created-blocked" }, 38}; 39 40const char *scsi_device_state_name(enum scsi_device_state state) 41{ 42 int i; 43 char *name = NULL; 44 45 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 46 if (sdev_states[i].value == state) { 47 name = sdev_states[i].name; 48 break; 49 } 50 } 51 return name; 52} 53 54static const struct { 55 enum scsi_host_state value; 56 char *name; 57} shost_states[] = { 58 { SHOST_CREATED, "created" }, 59 { SHOST_RUNNING, "running" }, 60 { SHOST_CANCEL, "cancel" }, 61 { SHOST_DEL, "deleted" }, 62 { SHOST_RECOVERY, "recovery" }, 63 { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, 64 { SHOST_DEL_RECOVERY, "deleted/recovery", }, 65}; 66const char *scsi_host_state_name(enum scsi_host_state state) 67{ 68 int i; 69 char *name = NULL; 70 71 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 72 if (shost_states[i].value == state) { 73 name = shost_states[i].name; 74 break; 75 } 76 } 77 return name; 78} 79 80static int check_set(unsigned int *val, char *src) 81{ 82 char *last; 83 84 if (strncmp(src, "-", 20) == 0) { 85 *val = SCAN_WILD_CARD; 86 } else { 87 /* 88 * Doesn't check for int overflow 89 */ 90 *val = simple_strtoul(src, &last, 0); 91 if (*last != '\0') 92 return 1; 93 } 94 return 0; 95} 96 97static int scsi_scan(struct Scsi_Host *shost, const char *str) 98{ 99 char s1[15], s2[15], s3[15], junk; 100 unsigned int channel, id, lun; 101 int res; 102 103 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk); 104 if (res != 3) 105 return -EINVAL; 106 if (check_set(&channel, s1)) 107 return -EINVAL; 108 if (check_set(&id, s2)) 109 return -EINVAL; 110 if (check_set(&lun, s3)) 111 return -EINVAL; 112 if (shost->transportt->user_scan) 113 res = shost->transportt->user_scan(shost, channel, id, lun); 114 else 115 res = scsi_scan_host_selected(shost, channel, id, lun, 1); 116 return res; 117} 118 119/* 120 * shost_show_function: macro to create an attr function that can be used to 121 * show a non-bit field. 122 */ 123#define shost_show_function(name, field, format_string) \ 124static ssize_t \ 125show_##name (struct device *dev, struct device_attribute *attr, \ 126 char *buf) \ 127{ \ 128 struct Scsi_Host *shost = class_to_shost(dev); \ 129 return snprintf (buf, 20, format_string, shost->field); \ 130} 131 132/* 133 * shost_rd_attr: macro to create a function and attribute variable for a 134 * read only field. 135 */ 136#define shost_rd_attr2(name, field, format_string) \ 137 shost_show_function(name, field, format_string) \ 138static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 139 140#define shost_rd_attr(field, format_string) \ 141shost_rd_attr2(field, field, format_string) 142 143/* 144 * Create the actual show/store functions and data structures. 145 */ 146 147static ssize_t 148store_scan(struct device *dev, struct device_attribute *attr, 149 const char *buf, size_t count) 150{ 151 struct Scsi_Host *shost = class_to_shost(dev); 152 int res; 153 154 res = scsi_scan(shost, buf); 155 if (res == 0) 156 res = count; 157 return res; 158}; 159static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); 160 161static ssize_t 162store_shost_state(struct device *dev, struct device_attribute *attr, 163 const char *buf, size_t count) 164{ 165 int i; 166 struct Scsi_Host *shost = class_to_shost(dev); 167 enum scsi_host_state state = 0; 168 169 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 170 const int len = strlen(shost_states[i].name); 171 if (strncmp(shost_states[i].name, buf, len) == 0 && 172 buf[len] == '\n') { 173 state = shost_states[i].value; 174 break; 175 } 176 } 177 if (!state) 178 return -EINVAL; 179 180 if (scsi_host_set_state(shost, state)) 181 return -EINVAL; 182 return count; 183} 184 185static ssize_t 186show_shost_state(struct device *dev, struct device_attribute *attr, char *buf) 187{ 188 struct Scsi_Host *shost = class_to_shost(dev); 189 const char *name = scsi_host_state_name(shost->shost_state); 190 191 if (!name) 192 return -EINVAL; 193 194 return snprintf(buf, 20, "%s\n", name); 195} 196 197/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */ 198struct device_attribute dev_attr_hstate = 199 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); 200 201static ssize_t 202show_shost_mode(unsigned int mode, char *buf) 203{ 204 ssize_t len = 0; 205 206 if (mode & MODE_INITIATOR) 207 len = sprintf(buf, "%s", "Initiator"); 208 209 if (mode & MODE_TARGET) 210 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); 211 212 len += sprintf(buf + len, "\n"); 213 214 return len; 215} 216 217static ssize_t 218show_shost_supported_mode(struct device *dev, struct device_attribute *attr, 219 char *buf) 220{ 221 struct Scsi_Host *shost = class_to_shost(dev); 222 unsigned int supported_mode = shost->hostt->supported_mode; 223 224 if (supported_mode == MODE_UNKNOWN) 225 /* by default this should be initiator */ 226 supported_mode = MODE_INITIATOR; 227 228 return show_shost_mode(supported_mode, buf); 229} 230 231static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); 232 233static ssize_t 234show_shost_active_mode(struct device *dev, 235 struct device_attribute *attr, char *buf) 236{ 237 struct Scsi_Host *shost = class_to_shost(dev); 238 239 if (shost->active_mode == MODE_UNKNOWN) 240 return snprintf(buf, 20, "unknown\n"); 241 else 242 return show_shost_mode(shost->active_mode, buf); 243} 244 245static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); 246 247shost_rd_attr(unique_id, "%u\n"); 248shost_rd_attr(host_busy, "%hu\n"); 249shost_rd_attr(cmd_per_lun, "%hd\n"); 250shost_rd_attr(can_queue, "%hd\n"); 251shost_rd_attr(sg_tablesize, "%hu\n"); 252shost_rd_attr(unchecked_isa_dma, "%d\n"); 253shost_rd_attr(prot_capabilities, "%u\n"); 254shost_rd_attr(prot_guard_type, "%hd\n"); 255shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 256 257static struct attribute *scsi_sysfs_shost_attrs[] = { 258 &dev_attr_unique_id.attr, 259 &dev_attr_host_busy.attr, 260 &dev_attr_cmd_per_lun.attr, 261 &dev_attr_can_queue.attr, 262 &dev_attr_sg_tablesize.attr, 263 &dev_attr_unchecked_isa_dma.attr, 264 &dev_attr_proc_name.attr, 265 &dev_attr_scan.attr, 266 &dev_attr_hstate.attr, 267 &dev_attr_supported_mode.attr, 268 &dev_attr_active_mode.attr, 269 &dev_attr_prot_capabilities.attr, 270 &dev_attr_prot_guard_type.attr, 271 NULL 272}; 273 274struct attribute_group scsi_shost_attr_group = { 275 .attrs = scsi_sysfs_shost_attrs, 276}; 277 278const struct attribute_group *scsi_sysfs_shost_attr_groups[] = { 279 &scsi_shost_attr_group, 280 NULL 281}; 282 283static void scsi_device_cls_release(struct device *class_dev) 284{ 285 struct scsi_device *sdev; 286 287 sdev = class_to_sdev(class_dev); 288 put_device(&sdev->sdev_gendev); 289} 290 291static void scsi_device_dev_release_usercontext(struct work_struct *work) 292{ 293 struct scsi_device *sdev; 294 struct device *parent; 295 struct scsi_target *starget; 296 struct list_head *this, *tmp; 297 unsigned long flags; 298 299 sdev = container_of(work, struct scsi_device, ew.work); 300 301 parent = sdev->sdev_gendev.parent; 302 starget = to_scsi_target(parent); 303 304 spin_lock_irqsave(sdev->host->host_lock, flags); 305 starget->reap_ref++; 306 list_del(&sdev->siblings); 307 list_del(&sdev->same_target_siblings); 308 list_del(&sdev->starved_entry); 309 spin_unlock_irqrestore(sdev->host->host_lock, flags); 310 311 cancel_work_sync(&sdev->event_work); 312 313 list_for_each_safe(this, tmp, &sdev->event_list) { 314 struct scsi_event *evt; 315 316 evt = list_entry(this, struct scsi_event, node); 317 list_del(&evt->node); 318 kfree(evt); 319 } 320 321 if (sdev->request_queue) { 322 sdev->request_queue->queuedata = NULL; 323 /* user context needed to free queue */ 324 scsi_free_queue(sdev->request_queue); 325 /* temporary expedient, try to catch use of queue lock 326 * after free of sdev */ 327 sdev->request_queue = NULL; 328 } 329 330 scsi_target_reap(scsi_target(sdev)); 331 332 kfree(sdev->inquiry); 333 kfree(sdev); 334 335 if (parent) 336 put_device(parent); 337} 338 339static void scsi_device_dev_release(struct device *dev) 340{ 341 struct scsi_device *sdp = to_scsi_device(dev); 342 execute_in_process_context(scsi_device_dev_release_usercontext, 343 &sdp->ew); 344} 345 346static struct class sdev_class = { 347 .name = "scsi_device", 348 .dev_release = scsi_device_cls_release, 349}; 350 351/* all probing is done in the individual ->probe routines */ 352static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 353{ 354 struct scsi_device *sdp; 355 356 if (dev->type != &scsi_dev_type) 357 return 0; 358 359 sdp = to_scsi_device(dev); 360 if (sdp->no_uld_attach) 361 return 0; 362 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 363} 364 365static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 366{ 367 struct scsi_device *sdev; 368 369 if (dev->type != &scsi_dev_type) 370 return 0; 371 372 sdev = to_scsi_device(dev); 373 374 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 375 return 0; 376} 377 378static int scsi_bus_suspend(struct device * dev, pm_message_t state) 379{ 380 struct device_driver *drv; 381 struct scsi_device *sdev; 382 int err; 383 384 if (dev->type != &scsi_dev_type) 385 return 0; 386 387 drv = dev->driver; 388 sdev = to_scsi_device(dev); 389 390 err = scsi_device_quiesce(sdev); 391 if (err) 392 return err; 393 394 if (drv && drv->suspend) { 395 err = drv->suspend(dev, state); 396 if (err) 397 return err; 398 } 399 400 return 0; 401} 402 403static int scsi_bus_resume(struct device * dev) 404{ 405 struct device_driver *drv; 406 struct scsi_device *sdev; 407 int err = 0; 408 409 if (dev->type != &scsi_dev_type) 410 return 0; 411 412 drv = dev->driver; 413 sdev = to_scsi_device(dev); 414 415 if (drv && drv->resume) 416 err = drv->resume(dev); 417 418 scsi_device_resume(sdev); 419 420 return err; 421} 422 423struct bus_type scsi_bus_type = { 424 .name = "scsi", 425 .match = scsi_bus_match, 426 .uevent = scsi_bus_uevent, 427 .suspend = scsi_bus_suspend, 428 .resume = scsi_bus_resume, 429}; 430EXPORT_SYMBOL_GPL(scsi_bus_type); 431 432int scsi_sysfs_register(void) 433{ 434 int error; 435 436 error = bus_register(&scsi_bus_type); 437 if (!error) { 438 error = class_register(&sdev_class); 439 if (error) 440 bus_unregister(&scsi_bus_type); 441 } 442 443 return error; 444} 445 446void scsi_sysfs_unregister(void) 447{ 448 class_unregister(&sdev_class); 449 bus_unregister(&scsi_bus_type); 450} 451 452/* 453 * sdev_show_function: macro to create an attr function that can be used to 454 * show a non-bit field. 455 */ 456#define sdev_show_function(field, format_string) \ 457static ssize_t \ 458sdev_show_##field (struct device *dev, struct device_attribute *attr, \ 459 char *buf) \ 460{ \ 461 struct scsi_device *sdev; \ 462 sdev = to_scsi_device(dev); \ 463 return snprintf (buf, 20, format_string, sdev->field); \ 464} \ 465 466/* 467 * sdev_rd_attr: macro to create a function and attribute variable for a 468 * read only field. 469 */ 470#define sdev_rd_attr(field, format_string) \ 471 sdev_show_function(field, format_string) \ 472static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 473 474 475/* 476 * sdev_rd_attr: create a function and attribute variable for a 477 * read/write field. 478 */ 479#define sdev_rw_attr(field, format_string) \ 480 sdev_show_function(field, format_string) \ 481 \ 482static ssize_t \ 483sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 484 const char *buf, size_t count) \ 485{ \ 486 struct scsi_device *sdev; \ 487 sdev = to_scsi_device(dev); \ 488 snscanf (buf, 20, format_string, &sdev->field); \ 489 return count; \ 490} \ 491static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 492 493/* Currently we don't export bit fields, but we might in future, 494 * so leave this code in */ 495#if 0 496/* 497 * sdev_rd_attr: create a function and attribute variable for a 498 * read/write bit field. 499 */ 500#define sdev_rw_attr_bit(field) \ 501 sdev_show_function(field, "%d\n") \ 502 \ 503static ssize_t \ 504sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 505 const char *buf, size_t count) \ 506{ \ 507 int ret; \ 508 struct scsi_device *sdev; \ 509 ret = scsi_sdev_check_buf_bit(buf); \ 510 if (ret >= 0) { \ 511 sdev = to_scsi_device(dev); \ 512 sdev->field = ret; \ 513 ret = count; \ 514 } \ 515 return ret; \ 516} \ 517static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 518 519/* 520 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 521 * else return -EINVAL. 522 */ 523static int scsi_sdev_check_buf_bit(const char *buf) 524{ 525 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 526 if (buf[0] == '1') 527 return 1; 528 else if (buf[0] == '0') 529 return 0; 530 else 531 return -EINVAL; 532 } else 533 return -EINVAL; 534} 535#endif 536/* 537 * Create the actual show/store functions and data structures. 538 */ 539sdev_rd_attr (device_blocked, "%d\n"); 540sdev_rd_attr (queue_depth, "%d\n"); 541sdev_rd_attr (type, "%d\n"); 542sdev_rd_attr (scsi_level, "%d\n"); 543sdev_rd_attr (vendor, "%.8s\n"); 544sdev_rd_attr (model, "%.16s\n"); 545sdev_rd_attr (rev, "%.4s\n"); 546 547/* 548 * TODO: can we make these symlinks to the block layer ones? 549 */ 550static ssize_t 551sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 552{ 553 struct scsi_device *sdev; 554 sdev = to_scsi_device(dev); 555 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ); 556} 557 558static ssize_t 559sdev_store_timeout (struct device *dev, struct device_attribute *attr, 560 const char *buf, size_t count) 561{ 562 struct scsi_device *sdev; 563 int timeout; 564 sdev = to_scsi_device(dev); 565 sscanf (buf, "%d\n", &timeout); 566 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ); 567 return count; 568} 569static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 570 571static ssize_t 572store_rescan_field (struct device *dev, struct device_attribute *attr, 573 const char *buf, size_t count) 574{ 575 scsi_rescan_device(dev); 576 return count; 577} 578static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 579 580static void sdev_store_delete_callback(struct device *dev) 581{ 582 scsi_remove_device(to_scsi_device(dev)); 583} 584 585static ssize_t 586sdev_store_delete(struct device *dev, struct device_attribute *attr, 587 const char *buf, size_t count) 588{ 589 int rc; 590 591 /* An attribute cannot be unregistered by one of its own methods, 592 * so we have to use this roundabout approach. 593 */ 594 rc = device_schedule_callback(dev, sdev_store_delete_callback); 595 if (rc) 596 count = rc; 597 return count; 598}; 599static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 600 601static ssize_t 602store_state_field(struct device *dev, struct device_attribute *attr, 603 const char *buf, size_t count) 604{ 605 int i; 606 struct scsi_device *sdev = to_scsi_device(dev); 607 enum scsi_device_state state = 0; 608 609 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 610 const int len = strlen(sdev_states[i].name); 611 if (strncmp(sdev_states[i].name, buf, len) == 0 && 612 buf[len] == '\n') { 613 state = sdev_states[i].value; 614 break; 615 } 616 } 617 if (!state) 618 return -EINVAL; 619 620 if (scsi_device_set_state(sdev, state)) 621 return -EINVAL; 622 return count; 623} 624 625static ssize_t 626show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 627{ 628 struct scsi_device *sdev = to_scsi_device(dev); 629 const char *name = scsi_device_state_name(sdev->sdev_state); 630 631 if (!name) 632 return -EINVAL; 633 634 return snprintf(buf, 20, "%s\n", name); 635} 636 637static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 638 639static ssize_t 640show_queue_type_field(struct device *dev, struct device_attribute *attr, 641 char *buf) 642{ 643 struct scsi_device *sdev = to_scsi_device(dev); 644 const char *name = "none"; 645 646 if (sdev->ordered_tags) 647 name = "ordered"; 648 else if (sdev->simple_tags) 649 name = "simple"; 650 651 return snprintf(buf, 20, "%s\n", name); 652} 653 654static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 655 656static ssize_t 657show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 658{ 659 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 660} 661 662static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 663 664#define show_sdev_iostat(field) \ 665static ssize_t \ 666show_iostat_##field(struct device *dev, struct device_attribute *attr, \ 667 char *buf) \ 668{ \ 669 struct scsi_device *sdev = to_scsi_device(dev); \ 670 unsigned long long count = atomic_read(&sdev->field); \ 671 return snprintf(buf, 20, "0x%llx\n", count); \ 672} \ 673static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 674 675show_sdev_iostat(iorequest_cnt); 676show_sdev_iostat(iodone_cnt); 677show_sdev_iostat(ioerr_cnt); 678 679static ssize_t 680sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 681{ 682 struct scsi_device *sdev; 683 sdev = to_scsi_device(dev); 684 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 685} 686static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 687 688#define DECLARE_EVT_SHOW(name, Cap_name) \ 689static ssize_t \ 690sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ 691 char *buf) \ 692{ \ 693 struct scsi_device *sdev = to_scsi_device(dev); \ 694 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ 695 return snprintf(buf, 20, "%d\n", val); \ 696} 697 698#define DECLARE_EVT_STORE(name, Cap_name) \ 699static ssize_t \ 700sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ 701 const char *buf, size_t count) \ 702{ \ 703 struct scsi_device *sdev = to_scsi_device(dev); \ 704 int val = simple_strtoul(buf, NULL, 0); \ 705 if (val == 0) \ 706 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 707 else if (val == 1) \ 708 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 709 else \ 710 return -EINVAL; \ 711 return count; \ 712} 713 714#define DECLARE_EVT(name, Cap_name) \ 715 DECLARE_EVT_SHOW(name, Cap_name) \ 716 DECLARE_EVT_STORE(name, Cap_name) \ 717 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ 718 sdev_store_evt_##name); 719#define REF_EVT(name) &dev_attr_evt_##name.attr 720 721DECLARE_EVT(media_change, MEDIA_CHANGE) 722 723/* Default template for device attributes. May NOT be modified */ 724static struct attribute *scsi_sdev_attrs[] = { 725 &dev_attr_device_blocked.attr, 726 &dev_attr_type.attr, 727 &dev_attr_scsi_level.attr, 728 &dev_attr_vendor.attr, 729 &dev_attr_model.attr, 730 &dev_attr_rev.attr, 731 &dev_attr_rescan.attr, 732 &dev_attr_delete.attr, 733 &dev_attr_state.attr, 734 &dev_attr_timeout.attr, 735 &dev_attr_iocounterbits.attr, 736 &dev_attr_iorequest_cnt.attr, 737 &dev_attr_iodone_cnt.attr, 738 &dev_attr_ioerr_cnt.attr, 739 &dev_attr_modalias.attr, 740 REF_EVT(media_change), 741 NULL 742}; 743 744static struct attribute_group scsi_sdev_attr_group = { 745 .attrs = scsi_sdev_attrs, 746}; 747 748static const struct attribute_group *scsi_sdev_attr_groups[] = { 749 &scsi_sdev_attr_group, 750 NULL 751}; 752 753static ssize_t 754sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, 755 const char *buf, size_t count) 756{ 757 int depth, retval; 758 struct scsi_device *sdev = to_scsi_device(dev); 759 struct scsi_host_template *sht = sdev->host->hostt; 760 761 if (!sht->change_queue_depth) 762 return -EINVAL; 763 764 depth = simple_strtoul(buf, NULL, 0); 765 766 if (depth < 1) 767 return -EINVAL; 768 769 retval = sht->change_queue_depth(sdev, depth, 770 SCSI_QDEPTH_DEFAULT); 771 if (retval < 0) 772 return retval; 773 774 return count; 775} 776 777static struct device_attribute sdev_attr_queue_depth_rw = 778 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 779 sdev_store_queue_depth_rw); 780 781static ssize_t 782sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, 783 const char *buf, size_t count) 784{ 785 struct scsi_device *sdev = to_scsi_device(dev); 786 struct scsi_host_template *sht = sdev->host->hostt; 787 int tag_type = 0, retval; 788 int prev_tag_type = scsi_get_tag_type(sdev); 789 790 if (!sdev->tagged_supported || !sht->change_queue_type) 791 return -EINVAL; 792 793 if (strncmp(buf, "ordered", 7) == 0) 794 tag_type = MSG_ORDERED_TAG; 795 else if (strncmp(buf, "simple", 6) == 0) 796 tag_type = MSG_SIMPLE_TAG; 797 else if (strncmp(buf, "none", 4) != 0) 798 return -EINVAL; 799 800 if (tag_type == prev_tag_type) 801 return count; 802 803 retval = sht->change_queue_type(sdev, tag_type); 804 if (retval < 0) 805 return retval; 806 807 return count; 808} 809 810static int scsi_target_add(struct scsi_target *starget) 811{ 812 int error; 813 814 if (starget->state != STARGET_CREATED) 815 return 0; 816 817 error = device_add(&starget->dev); 818 if (error) { 819 dev_err(&starget->dev, "target device_add failed, error %d\n", error); 820 get_device(&starget->dev); 821 scsi_target_reap(starget); 822 put_device(&starget->dev); 823 return error; 824 } 825 transport_add_device(&starget->dev); 826 starget->state = STARGET_RUNNING; 827 828 return 0; 829} 830 831static struct device_attribute sdev_attr_queue_type_rw = 832 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 833 sdev_store_queue_type_rw); 834 835/** 836 * scsi_sysfs_add_sdev - add scsi device to sysfs 837 * @sdev: scsi_device to add 838 * 839 * Return value: 840 * 0 on Success / non-zero on Failure 841 **/ 842int scsi_sysfs_add_sdev(struct scsi_device *sdev) 843{ 844 int error, i; 845 struct request_queue *rq = sdev->request_queue; 846 struct scsi_target *starget = sdev->sdev_target; 847 848 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 849 return error; 850 851 error = scsi_target_add(starget); 852 if (error) 853 return error; 854 855 transport_configure_device(&starget->dev); 856 error = device_add(&sdev->sdev_gendev); 857 if (error) { 858 put_device(sdev->sdev_gendev.parent); 859 printk(KERN_INFO "error 1\n"); 860 return error; 861 } 862 error = device_add(&sdev->sdev_dev); 863 if (error) { 864 printk(KERN_INFO "error 2\n"); 865 goto clean_device; 866 } 867 868 /* create queue files, which may be writable, depending on the host */ 869 if (sdev->host->hostt->change_queue_depth) 870 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw); 871 else 872 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth); 873 if (error) { 874 __scsi_remove_device(sdev); 875 goto out; 876 } 877 if (sdev->host->hostt->change_queue_type) 878 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw); 879 else 880 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type); 881 if (error) { 882 __scsi_remove_device(sdev); 883 goto out; 884 } 885 886 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL); 887 888 if (error) 889 sdev_printk(KERN_INFO, sdev, 890 "Failed to register bsg queue, errno=%d\n", error); 891 892 /* we're treating error on bsg register as non-fatal, so pretend 893 * nothing went wrong */ 894 error = 0; 895 896 /* add additional host specific attributes */ 897 if (sdev->host->hostt->sdev_attrs) { 898 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 899 error = device_create_file(&sdev->sdev_gendev, 900 sdev->host->hostt->sdev_attrs[i]); 901 if (error) { 902 __scsi_remove_device(sdev); 903 goto out; 904 } 905 } 906 } 907 908 transport_add_device(&sdev->sdev_gendev); 909 out: 910 return error; 911 912 clean_device: 913 scsi_device_set_state(sdev, SDEV_CANCEL); 914 915 device_del(&sdev->sdev_gendev); 916 transport_destroy_device(&sdev->sdev_gendev); 917 put_device(&sdev->sdev_dev); 918 put_device(&sdev->sdev_gendev); 919 920 return error; 921} 922 923void __scsi_remove_device(struct scsi_device *sdev) 924{ 925 struct device *dev = &sdev->sdev_gendev; 926 927 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 928 return; 929 930 bsg_unregister_queue(sdev->request_queue); 931 device_unregister(&sdev->sdev_dev); 932 transport_remove_device(dev); 933 device_del(dev); 934 scsi_device_set_state(sdev, SDEV_DEL); 935 if (sdev->host->hostt->slave_destroy) 936 sdev->host->hostt->slave_destroy(sdev); 937 transport_destroy_device(dev); 938 put_device(dev); 939} 940 941/** 942 * scsi_remove_device - unregister a device from the scsi bus 943 * @sdev: scsi_device to unregister 944 **/ 945void scsi_remove_device(struct scsi_device *sdev) 946{ 947 struct Scsi_Host *shost = sdev->host; 948 949 mutex_lock(&shost->scan_mutex); 950 __scsi_remove_device(sdev); 951 mutex_unlock(&shost->scan_mutex); 952} 953EXPORT_SYMBOL(scsi_remove_device); 954 955static void __scsi_remove_target(struct scsi_target *starget) 956{ 957 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 958 unsigned long flags; 959 struct scsi_device *sdev; 960 961 spin_lock_irqsave(shost->host_lock, flags); 962 starget->reap_ref++; 963 restart: 964 list_for_each_entry(sdev, &shost->__devices, siblings) { 965 if (sdev->channel != starget->channel || 966 sdev->id != starget->id || 967 sdev->sdev_state == SDEV_DEL) 968 continue; 969 spin_unlock_irqrestore(shost->host_lock, flags); 970 scsi_remove_device(sdev); 971 spin_lock_irqsave(shost->host_lock, flags); 972 goto restart; 973 } 974 spin_unlock_irqrestore(shost->host_lock, flags); 975 scsi_target_reap(starget); 976} 977 978static int __remove_child (struct device * dev, void * data) 979{ 980 if (scsi_is_target_device(dev)) 981 __scsi_remove_target(to_scsi_target(dev)); 982 return 0; 983} 984 985/** 986 * scsi_remove_target - try to remove a target and all its devices 987 * @dev: generic starget or parent of generic stargets to be removed 988 * 989 * Note: This is slightly racy. It is possible that if the user 990 * requests the addition of another device then the target won't be 991 * removed. 992 */ 993void scsi_remove_target(struct device *dev) 994{ 995 struct device *rdev; 996 997 if (scsi_is_target_device(dev)) { 998 __scsi_remove_target(to_scsi_target(dev)); 999 return; 1000 } 1001 1002 rdev = get_device(dev); 1003 device_for_each_child(dev, NULL, __remove_child); 1004 put_device(rdev); 1005} 1006EXPORT_SYMBOL(scsi_remove_target); 1007 1008int scsi_register_driver(struct device_driver *drv) 1009{ 1010 drv->bus = &scsi_bus_type; 1011 1012 return driver_register(drv); 1013} 1014EXPORT_SYMBOL(scsi_register_driver); 1015 1016int scsi_register_interface(struct class_interface *intf) 1017{ 1018 intf->class = &sdev_class; 1019 1020 return class_interface_register(intf); 1021} 1022EXPORT_SYMBOL(scsi_register_interface); 1023 1024/** 1025 * scsi_sysfs_add_host - add scsi host to subsystem 1026 * @shost: scsi host struct to add to subsystem 1027 **/ 1028int scsi_sysfs_add_host(struct Scsi_Host *shost) 1029{ 1030 int error, i; 1031 1032 /* add host specific attributes */ 1033 if (shost->hostt->shost_attrs) { 1034 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 1035 error = device_create_file(&shost->shost_dev, 1036 shost->hostt->shost_attrs[i]); 1037 if (error) 1038 return error; 1039 } 1040 } 1041 1042 transport_register_device(&shost->shost_gendev); 1043 transport_configure_device(&shost->shost_gendev); 1044 return 0; 1045} 1046 1047static struct device_type scsi_dev_type = { 1048 .name = "scsi_device", 1049 .release = scsi_device_dev_release, 1050 .groups = scsi_sdev_attr_groups, 1051}; 1052 1053void scsi_sysfs_device_initialize(struct scsi_device *sdev) 1054{ 1055 unsigned long flags; 1056 struct Scsi_Host *shost = sdev->host; 1057 struct scsi_target *starget = sdev->sdev_target; 1058 1059 device_initialize(&sdev->sdev_gendev); 1060 sdev->sdev_gendev.bus = &scsi_bus_type; 1061 sdev->sdev_gendev.type = &scsi_dev_type; 1062 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d", 1063 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1064 1065 device_initialize(&sdev->sdev_dev); 1066 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev); 1067 sdev->sdev_dev.class = &sdev_class; 1068 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d", 1069 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1070 sdev->scsi_level = starget->scsi_level; 1071 transport_setup_device(&sdev->sdev_gendev); 1072 spin_lock_irqsave(shost->host_lock, flags); 1073 list_add_tail(&sdev->same_target_siblings, &starget->devices); 1074 list_add_tail(&sdev->siblings, &shost->__devices); 1075 spin_unlock_irqrestore(shost->host_lock, flags); 1076} 1077 1078int scsi_is_sdev_device(const struct device *dev) 1079{ 1080 return dev->type == &scsi_dev_type; 1081} 1082EXPORT_SYMBOL(scsi_is_sdev_device); 1083 1084/* A blank transport template that is used in drivers that don't 1085 * yet implement Transport Attributes */ 1086struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1087