scsi_sysfs.c revision aa33860158114d0df3c7997bc1dd41c0168e1c2a
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/slab.h> 11#include <linux/init.h> 12#include <linux/blkdev.h> 13#include <linux/device.h> 14#include <linux/pm_runtime.h> 15 16#include <scsi/scsi.h> 17#include <scsi/scsi_device.h> 18#include <scsi/scsi_host.h> 19#include <scsi/scsi_tcq.h> 20#include <scsi/scsi_transport.h> 21#include <scsi/scsi_driver.h> 22 23#include "scsi_priv.h" 24#include "scsi_logging.h" 25 26static struct device_type scsi_dev_type; 27 28static const struct { 29 enum scsi_device_state value; 30 char *name; 31} sdev_states[] = { 32 { SDEV_CREATED, "created" }, 33 { SDEV_RUNNING, "running" }, 34 { SDEV_CANCEL, "cancel" }, 35 { SDEV_DEL, "deleted" }, 36 { SDEV_QUIESCE, "quiesce" }, 37 { SDEV_OFFLINE, "offline" }, 38 { SDEV_BLOCK, "blocked" }, 39 { SDEV_CREATED_BLOCK, "created-blocked" }, 40}; 41 42const char *scsi_device_state_name(enum scsi_device_state state) 43{ 44 int i; 45 char *name = NULL; 46 47 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 48 if (sdev_states[i].value == state) { 49 name = sdev_states[i].name; 50 break; 51 } 52 } 53 return name; 54} 55 56static const struct { 57 enum scsi_host_state value; 58 char *name; 59} shost_states[] = { 60 { SHOST_CREATED, "created" }, 61 { SHOST_RUNNING, "running" }, 62 { SHOST_CANCEL, "cancel" }, 63 { SHOST_DEL, "deleted" }, 64 { SHOST_RECOVERY, "recovery" }, 65 { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, 66 { SHOST_DEL_RECOVERY, "deleted/recovery", }, 67}; 68const char *scsi_host_state_name(enum scsi_host_state state) 69{ 70 int i; 71 char *name = NULL; 72 73 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 74 if (shost_states[i].value == state) { 75 name = shost_states[i].name; 76 break; 77 } 78 } 79 return name; 80} 81 82static int check_set(unsigned int *val, char *src) 83{ 84 char *last; 85 86 if (strncmp(src, "-", 20) == 0) { 87 *val = SCAN_WILD_CARD; 88 } else { 89 /* 90 * Doesn't check for int overflow 91 */ 92 *val = simple_strtoul(src, &last, 0); 93 if (*last != '\0') 94 return 1; 95 } 96 return 0; 97} 98 99static int scsi_scan(struct Scsi_Host *shost, const char *str) 100{ 101 char s1[15], s2[15], s3[15], junk; 102 unsigned int channel, id, lun; 103 int res; 104 105 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk); 106 if (res != 3) 107 return -EINVAL; 108 if (check_set(&channel, s1)) 109 return -EINVAL; 110 if (check_set(&id, s2)) 111 return -EINVAL; 112 if (check_set(&lun, s3)) 113 return -EINVAL; 114 if (shost->transportt->user_scan) 115 res = shost->transportt->user_scan(shost, channel, id, lun); 116 else 117 res = scsi_scan_host_selected(shost, channel, id, lun, 1); 118 return res; 119} 120 121/* 122 * shost_show_function: macro to create an attr function that can be used to 123 * show a non-bit field. 124 */ 125#define shost_show_function(name, field, format_string) \ 126static ssize_t \ 127show_##name (struct device *dev, struct device_attribute *attr, \ 128 char *buf) \ 129{ \ 130 struct Scsi_Host *shost = class_to_shost(dev); \ 131 return snprintf (buf, 20, format_string, shost->field); \ 132} 133 134/* 135 * shost_rd_attr: macro to create a function and attribute variable for a 136 * read only field. 137 */ 138#define shost_rd_attr2(name, field, format_string) \ 139 shost_show_function(name, field, format_string) \ 140static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 141 142#define shost_rd_attr(field, format_string) \ 143shost_rd_attr2(field, field, format_string) 144 145/* 146 * Create the actual show/store functions and data structures. 147 */ 148 149static ssize_t 150store_scan(struct device *dev, struct device_attribute *attr, 151 const char *buf, size_t count) 152{ 153 struct Scsi_Host *shost = class_to_shost(dev); 154 int res; 155 156 res = scsi_scan(shost, buf); 157 if (res == 0) 158 res = count; 159 return res; 160}; 161static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); 162 163static ssize_t 164store_shost_state(struct device *dev, struct device_attribute *attr, 165 const char *buf, size_t count) 166{ 167 int i; 168 struct Scsi_Host *shost = class_to_shost(dev); 169 enum scsi_host_state state = 0; 170 171 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 172 const int len = strlen(shost_states[i].name); 173 if (strncmp(shost_states[i].name, buf, len) == 0 && 174 buf[len] == '\n') { 175 state = shost_states[i].value; 176 break; 177 } 178 } 179 if (!state) 180 return -EINVAL; 181 182 if (scsi_host_set_state(shost, state)) 183 return -EINVAL; 184 return count; 185} 186 187static ssize_t 188show_shost_state(struct device *dev, struct device_attribute *attr, char *buf) 189{ 190 struct Scsi_Host *shost = class_to_shost(dev); 191 const char *name = scsi_host_state_name(shost->shost_state); 192 193 if (!name) 194 return -EINVAL; 195 196 return snprintf(buf, 20, "%s\n", name); 197} 198 199/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */ 200struct device_attribute dev_attr_hstate = 201 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); 202 203static ssize_t 204show_shost_mode(unsigned int mode, char *buf) 205{ 206 ssize_t len = 0; 207 208 if (mode & MODE_INITIATOR) 209 len = sprintf(buf, "%s", "Initiator"); 210 211 if (mode & MODE_TARGET) 212 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); 213 214 len += sprintf(buf + len, "\n"); 215 216 return len; 217} 218 219static ssize_t 220show_shost_supported_mode(struct device *dev, struct device_attribute *attr, 221 char *buf) 222{ 223 struct Scsi_Host *shost = class_to_shost(dev); 224 unsigned int supported_mode = shost->hostt->supported_mode; 225 226 if (supported_mode == MODE_UNKNOWN) 227 /* by default this should be initiator */ 228 supported_mode = MODE_INITIATOR; 229 230 return show_shost_mode(supported_mode, buf); 231} 232 233static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); 234 235static ssize_t 236show_shost_active_mode(struct device *dev, 237 struct device_attribute *attr, char *buf) 238{ 239 struct Scsi_Host *shost = class_to_shost(dev); 240 241 if (shost->active_mode == MODE_UNKNOWN) 242 return snprintf(buf, 20, "unknown\n"); 243 else 244 return show_shost_mode(shost->active_mode, buf); 245} 246 247static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); 248 249shost_rd_attr(unique_id, "%u\n"); 250shost_rd_attr(host_busy, "%hu\n"); 251shost_rd_attr(cmd_per_lun, "%hd\n"); 252shost_rd_attr(can_queue, "%hd\n"); 253shost_rd_attr(sg_tablesize, "%hu\n"); 254shost_rd_attr(sg_prot_tablesize, "%hu\n"); 255shost_rd_attr(unchecked_isa_dma, "%d\n"); 256shost_rd_attr(prot_capabilities, "%u\n"); 257shost_rd_attr(prot_guard_type, "%hd\n"); 258shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 259 260static struct attribute *scsi_sysfs_shost_attrs[] = { 261 &dev_attr_unique_id.attr, 262 &dev_attr_host_busy.attr, 263 &dev_attr_cmd_per_lun.attr, 264 &dev_attr_can_queue.attr, 265 &dev_attr_sg_tablesize.attr, 266 &dev_attr_sg_prot_tablesize.attr, 267 &dev_attr_unchecked_isa_dma.attr, 268 &dev_attr_proc_name.attr, 269 &dev_attr_scan.attr, 270 &dev_attr_hstate.attr, 271 &dev_attr_supported_mode.attr, 272 &dev_attr_active_mode.attr, 273 &dev_attr_prot_capabilities.attr, 274 &dev_attr_prot_guard_type.attr, 275 NULL 276}; 277 278struct attribute_group scsi_shost_attr_group = { 279 .attrs = scsi_sysfs_shost_attrs, 280}; 281 282const struct attribute_group *scsi_sysfs_shost_attr_groups[] = { 283 &scsi_shost_attr_group, 284 NULL 285}; 286 287static void scsi_device_cls_release(struct device *class_dev) 288{ 289 struct scsi_device *sdev; 290 291 sdev = class_to_sdev(class_dev); 292 put_device(&sdev->sdev_gendev); 293} 294 295static void scsi_device_dev_release_usercontext(struct work_struct *work) 296{ 297 struct scsi_device *sdev; 298 struct device *parent; 299 struct scsi_target *starget; 300 struct list_head *this, *tmp; 301 unsigned long flags; 302 303 sdev = container_of(work, struct scsi_device, ew.work); 304 305 parent = sdev->sdev_gendev.parent; 306 starget = to_scsi_target(parent); 307 308 spin_lock_irqsave(sdev->host->host_lock, flags); 309 starget->reap_ref++; 310 list_del(&sdev->siblings); 311 list_del(&sdev->same_target_siblings); 312 list_del(&sdev->starved_entry); 313 spin_unlock_irqrestore(sdev->host->host_lock, flags); 314 315 cancel_work_sync(&sdev->event_work); 316 317 list_for_each_safe(this, tmp, &sdev->event_list) { 318 struct scsi_event *evt; 319 320 evt = list_entry(this, struct scsi_event, node); 321 list_del(&evt->node); 322 kfree(evt); 323 } 324 325 if (sdev->request_queue) { 326 sdev->request_queue->queuedata = NULL; 327 /* user context needed to free queue */ 328 scsi_free_queue(sdev->request_queue); 329 /* temporary expedient, try to catch use of queue lock 330 * after free of sdev */ 331 sdev->request_queue = NULL; 332 } 333 334 scsi_target_reap(scsi_target(sdev)); 335 336 kfree(sdev->inquiry); 337 kfree(sdev); 338 339 if (parent) 340 put_device(parent); 341} 342 343static void scsi_device_dev_release(struct device *dev) 344{ 345 struct scsi_device *sdp = to_scsi_device(dev); 346 execute_in_process_context(scsi_device_dev_release_usercontext, 347 &sdp->ew); 348} 349 350static struct class sdev_class = { 351 .name = "scsi_device", 352 .dev_release = scsi_device_cls_release, 353}; 354 355/* all probing is done in the individual ->probe routines */ 356static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 357{ 358 struct scsi_device *sdp; 359 360 if (dev->type != &scsi_dev_type) 361 return 0; 362 363 sdp = to_scsi_device(dev); 364 if (sdp->no_uld_attach) 365 return 0; 366 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 367} 368 369static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 370{ 371 struct scsi_device *sdev; 372 373 if (dev->type != &scsi_dev_type) 374 return 0; 375 376 sdev = to_scsi_device(dev); 377 378 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 379 return 0; 380} 381 382struct bus_type scsi_bus_type = { 383 .name = "scsi", 384 .match = scsi_bus_match, 385 .uevent = scsi_bus_uevent, 386#ifdef CONFIG_PM 387 .pm = &scsi_bus_pm_ops, 388#endif 389}; 390EXPORT_SYMBOL_GPL(scsi_bus_type); 391 392int scsi_sysfs_register(void) 393{ 394 int error; 395 396 error = bus_register(&scsi_bus_type); 397 if (!error) { 398 error = class_register(&sdev_class); 399 if (error) 400 bus_unregister(&scsi_bus_type); 401 } 402 403 return error; 404} 405 406void scsi_sysfs_unregister(void) 407{ 408 class_unregister(&sdev_class); 409 bus_unregister(&scsi_bus_type); 410} 411 412/* 413 * sdev_show_function: macro to create an attr function that can be used to 414 * show a non-bit field. 415 */ 416#define sdev_show_function(field, format_string) \ 417static ssize_t \ 418sdev_show_##field (struct device *dev, struct device_attribute *attr, \ 419 char *buf) \ 420{ \ 421 struct scsi_device *sdev; \ 422 sdev = to_scsi_device(dev); \ 423 return snprintf (buf, 20, format_string, sdev->field); \ 424} \ 425 426/* 427 * sdev_rd_attr: macro to create a function and attribute variable for a 428 * read only field. 429 */ 430#define sdev_rd_attr(field, format_string) \ 431 sdev_show_function(field, format_string) \ 432static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 433 434 435/* 436 * sdev_rw_attr: create a function and attribute variable for a 437 * read/write field. 438 */ 439#define sdev_rw_attr(field, format_string) \ 440 sdev_show_function(field, format_string) \ 441 \ 442static ssize_t \ 443sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 444 const char *buf, size_t count) \ 445{ \ 446 struct scsi_device *sdev; \ 447 sdev = to_scsi_device(dev); \ 448 sscanf (buf, format_string, &sdev->field); \ 449 return count; \ 450} \ 451static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 452 453/* Currently we don't export bit fields, but we might in future, 454 * so leave this code in */ 455#if 0 456/* 457 * sdev_rd_attr: create a function and attribute variable for a 458 * read/write bit field. 459 */ 460#define sdev_rw_attr_bit(field) \ 461 sdev_show_function(field, "%d\n") \ 462 \ 463static ssize_t \ 464sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 465 const char *buf, size_t count) \ 466{ \ 467 int ret; \ 468 struct scsi_device *sdev; \ 469 ret = scsi_sdev_check_buf_bit(buf); \ 470 if (ret >= 0) { \ 471 sdev = to_scsi_device(dev); \ 472 sdev->field = ret; \ 473 ret = count; \ 474 } \ 475 return ret; \ 476} \ 477static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 478 479/* 480 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 481 * else return -EINVAL. 482 */ 483static int scsi_sdev_check_buf_bit(const char *buf) 484{ 485 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 486 if (buf[0] == '1') 487 return 1; 488 else if (buf[0] == '0') 489 return 0; 490 else 491 return -EINVAL; 492 } else 493 return -EINVAL; 494} 495#endif 496/* 497 * Create the actual show/store functions and data structures. 498 */ 499sdev_rd_attr (device_blocked, "%d\n"); 500sdev_rd_attr (queue_depth, "%d\n"); 501sdev_rd_attr (type, "%d\n"); 502sdev_rd_attr (scsi_level, "%d\n"); 503sdev_rd_attr (vendor, "%.8s\n"); 504sdev_rd_attr (model, "%.16s\n"); 505sdev_rd_attr (rev, "%.4s\n"); 506 507/* 508 * TODO: can we make these symlinks to the block layer ones? 509 */ 510static ssize_t 511sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 512{ 513 struct scsi_device *sdev; 514 sdev = to_scsi_device(dev); 515 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ); 516} 517 518static ssize_t 519sdev_store_timeout (struct device *dev, struct device_attribute *attr, 520 const char *buf, size_t count) 521{ 522 struct scsi_device *sdev; 523 int timeout; 524 sdev = to_scsi_device(dev); 525 sscanf (buf, "%d\n", &timeout); 526 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ); 527 return count; 528} 529static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 530 531static ssize_t 532store_rescan_field (struct device *dev, struct device_attribute *attr, 533 const char *buf, size_t count) 534{ 535 scsi_rescan_device(dev); 536 return count; 537} 538static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 539 540static void sdev_store_delete_callback(struct device *dev) 541{ 542 scsi_remove_device(to_scsi_device(dev)); 543} 544 545static ssize_t 546sdev_store_delete(struct device *dev, struct device_attribute *attr, 547 const char *buf, size_t count) 548{ 549 int rc; 550 551 /* An attribute cannot be unregistered by one of its own methods, 552 * so we have to use this roundabout approach. 553 */ 554 rc = device_schedule_callback(dev, sdev_store_delete_callback); 555 if (rc) 556 count = rc; 557 return count; 558}; 559static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 560 561static ssize_t 562store_state_field(struct device *dev, struct device_attribute *attr, 563 const char *buf, size_t count) 564{ 565 int i; 566 struct scsi_device *sdev = to_scsi_device(dev); 567 enum scsi_device_state state = 0; 568 569 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 570 const int len = strlen(sdev_states[i].name); 571 if (strncmp(sdev_states[i].name, buf, len) == 0 && 572 buf[len] == '\n') { 573 state = sdev_states[i].value; 574 break; 575 } 576 } 577 if (!state) 578 return -EINVAL; 579 580 if (scsi_device_set_state(sdev, state)) 581 return -EINVAL; 582 return count; 583} 584 585static ssize_t 586show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 587{ 588 struct scsi_device *sdev = to_scsi_device(dev); 589 const char *name = scsi_device_state_name(sdev->sdev_state); 590 591 if (!name) 592 return -EINVAL; 593 594 return snprintf(buf, 20, "%s\n", name); 595} 596 597static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 598 599static ssize_t 600show_queue_type_field(struct device *dev, struct device_attribute *attr, 601 char *buf) 602{ 603 struct scsi_device *sdev = to_scsi_device(dev); 604 const char *name = "none"; 605 606 if (sdev->ordered_tags) 607 name = "ordered"; 608 else if (sdev->simple_tags) 609 name = "simple"; 610 611 return snprintf(buf, 20, "%s\n", name); 612} 613 614static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 615 616static ssize_t 617show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 618{ 619 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 620} 621 622static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 623 624#define show_sdev_iostat(field) \ 625static ssize_t \ 626show_iostat_##field(struct device *dev, struct device_attribute *attr, \ 627 char *buf) \ 628{ \ 629 struct scsi_device *sdev = to_scsi_device(dev); \ 630 unsigned long long count = atomic_read(&sdev->field); \ 631 return snprintf(buf, 20, "0x%llx\n", count); \ 632} \ 633static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 634 635show_sdev_iostat(iorequest_cnt); 636show_sdev_iostat(iodone_cnt); 637show_sdev_iostat(ioerr_cnt); 638 639static ssize_t 640sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 641{ 642 struct scsi_device *sdev; 643 sdev = to_scsi_device(dev); 644 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 645} 646static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 647 648#define DECLARE_EVT_SHOW(name, Cap_name) \ 649static ssize_t \ 650sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ 651 char *buf) \ 652{ \ 653 struct scsi_device *sdev = to_scsi_device(dev); \ 654 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ 655 return snprintf(buf, 20, "%d\n", val); \ 656} 657 658#define DECLARE_EVT_STORE(name, Cap_name) \ 659static ssize_t \ 660sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ 661 const char *buf, size_t count) \ 662{ \ 663 struct scsi_device *sdev = to_scsi_device(dev); \ 664 int val = simple_strtoul(buf, NULL, 0); \ 665 if (val == 0) \ 666 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 667 else if (val == 1) \ 668 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 669 else \ 670 return -EINVAL; \ 671 return count; \ 672} 673 674#define DECLARE_EVT(name, Cap_name) \ 675 DECLARE_EVT_SHOW(name, Cap_name) \ 676 DECLARE_EVT_STORE(name, Cap_name) \ 677 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ 678 sdev_store_evt_##name); 679#define REF_EVT(name) &dev_attr_evt_##name.attr 680 681DECLARE_EVT(media_change, MEDIA_CHANGE) 682 683/* Default template for device attributes. May NOT be modified */ 684static struct attribute *scsi_sdev_attrs[] = { 685 &dev_attr_device_blocked.attr, 686 &dev_attr_type.attr, 687 &dev_attr_scsi_level.attr, 688 &dev_attr_vendor.attr, 689 &dev_attr_model.attr, 690 &dev_attr_rev.attr, 691 &dev_attr_rescan.attr, 692 &dev_attr_delete.attr, 693 &dev_attr_state.attr, 694 &dev_attr_timeout.attr, 695 &dev_attr_iocounterbits.attr, 696 &dev_attr_iorequest_cnt.attr, 697 &dev_attr_iodone_cnt.attr, 698 &dev_attr_ioerr_cnt.attr, 699 &dev_attr_modalias.attr, 700 REF_EVT(media_change), 701 NULL 702}; 703 704static struct attribute_group scsi_sdev_attr_group = { 705 .attrs = scsi_sdev_attrs, 706}; 707 708static const struct attribute_group *scsi_sdev_attr_groups[] = { 709 &scsi_sdev_attr_group, 710 NULL 711}; 712 713static ssize_t 714sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, 715 const char *buf, size_t count) 716{ 717 int depth, retval; 718 struct scsi_device *sdev = to_scsi_device(dev); 719 struct scsi_host_template *sht = sdev->host->hostt; 720 721 if (!sht->change_queue_depth) 722 return -EINVAL; 723 724 depth = simple_strtoul(buf, NULL, 0); 725 726 if (depth < 1) 727 return -EINVAL; 728 729 retval = sht->change_queue_depth(sdev, depth, 730 SCSI_QDEPTH_DEFAULT); 731 if (retval < 0) 732 return retval; 733 734 sdev->max_queue_depth = sdev->queue_depth; 735 736 return count; 737} 738 739static struct device_attribute sdev_attr_queue_depth_rw = 740 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 741 sdev_store_queue_depth_rw); 742 743static ssize_t 744sdev_show_queue_ramp_up_period(struct device *dev, 745 struct device_attribute *attr, 746 char *buf) 747{ 748 struct scsi_device *sdev; 749 sdev = to_scsi_device(dev); 750 return snprintf(buf, 20, "%u\n", 751 jiffies_to_msecs(sdev->queue_ramp_up_period)); 752} 753 754static ssize_t 755sdev_store_queue_ramp_up_period(struct device *dev, 756 struct device_attribute *attr, 757 const char *buf, size_t count) 758{ 759 struct scsi_device *sdev = to_scsi_device(dev); 760 unsigned long period; 761 762 if (strict_strtoul(buf, 10, &period)) 763 return -EINVAL; 764 765 sdev->queue_ramp_up_period = msecs_to_jiffies(period); 766 return period; 767} 768 769static struct device_attribute sdev_attr_queue_ramp_up_period = 770 __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR, 771 sdev_show_queue_ramp_up_period, 772 sdev_store_queue_ramp_up_period); 773 774static ssize_t 775sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, 776 const char *buf, size_t count) 777{ 778 struct scsi_device *sdev = to_scsi_device(dev); 779 struct scsi_host_template *sht = sdev->host->hostt; 780 int tag_type = 0, retval; 781 int prev_tag_type = scsi_get_tag_type(sdev); 782 783 if (!sdev->tagged_supported || !sht->change_queue_type) 784 return -EINVAL; 785 786 if (strncmp(buf, "ordered", 7) == 0) 787 tag_type = MSG_ORDERED_TAG; 788 else if (strncmp(buf, "simple", 6) == 0) 789 tag_type = MSG_SIMPLE_TAG; 790 else if (strncmp(buf, "none", 4) != 0) 791 return -EINVAL; 792 793 if (tag_type == prev_tag_type) 794 return count; 795 796 retval = sht->change_queue_type(sdev, tag_type); 797 if (retval < 0) 798 return retval; 799 800 return count; 801} 802 803static int scsi_target_add(struct scsi_target *starget) 804{ 805 int error; 806 807 if (starget->state != STARGET_CREATED) 808 return 0; 809 810 error = device_add(&starget->dev); 811 if (error) { 812 dev_err(&starget->dev, "target device_add failed, error %d\n", error); 813 return error; 814 } 815 transport_add_device(&starget->dev); 816 starget->state = STARGET_RUNNING; 817 818 pm_runtime_set_active(&starget->dev); 819 pm_runtime_enable(&starget->dev); 820 device_enable_async_suspend(&starget->dev); 821 822 return 0; 823} 824 825static struct device_attribute sdev_attr_queue_type_rw = 826 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 827 sdev_store_queue_type_rw); 828 829/** 830 * scsi_sysfs_add_sdev - add scsi device to sysfs 831 * @sdev: scsi_device to add 832 * 833 * Return value: 834 * 0 on Success / non-zero on Failure 835 **/ 836int scsi_sysfs_add_sdev(struct scsi_device *sdev) 837{ 838 int error, i; 839 struct request_queue *rq = sdev->request_queue; 840 struct scsi_target *starget = sdev->sdev_target; 841 842 error = scsi_device_set_state(sdev, SDEV_RUNNING); 843 if (error) 844 return error; 845 846 error = scsi_target_add(starget); 847 if (error) 848 return error; 849 850 transport_configure_device(&starget->dev); 851 852 device_enable_async_suspend(&sdev->sdev_gendev); 853 scsi_autopm_get_target(starget); 854 pm_runtime_set_active(&sdev->sdev_gendev); 855 pm_runtime_forbid(&sdev->sdev_gendev); 856 pm_runtime_enable(&sdev->sdev_gendev); 857 scsi_autopm_put_target(starget); 858 859 /* The following call will keep sdev active indefinitely, until 860 * its driver does a corresponding scsi_autopm_pm_device(). Only 861 * drivers supporting autosuspend will do this. 862 */ 863 scsi_autopm_get_device(sdev); 864 865 error = device_add(&sdev->sdev_gendev); 866 if (error) { 867 sdev_printk(KERN_INFO, sdev, 868 "failed to add device: %d\n", error); 869 return error; 870 } 871 device_enable_async_suspend(&sdev->sdev_dev); 872 error = device_add(&sdev->sdev_dev); 873 if (error) { 874 sdev_printk(KERN_INFO, sdev, 875 "failed to add class device: %d\n", error); 876 device_del(&sdev->sdev_gendev); 877 return error; 878 } 879 transport_add_device(&sdev->sdev_gendev); 880 sdev->is_visible = 1; 881 882 /* create queue files, which may be writable, depending on the host */ 883 if (sdev->host->hostt->change_queue_depth) { 884 error = device_create_file(&sdev->sdev_gendev, 885 &sdev_attr_queue_depth_rw); 886 error = device_create_file(&sdev->sdev_gendev, 887 &sdev_attr_queue_ramp_up_period); 888 } 889 else 890 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth); 891 if (error) 892 return error; 893 894 if (sdev->host->hostt->change_queue_type) 895 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw); 896 else 897 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type); 898 if (error) 899 return error; 900 901 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL); 902 903 if (error) 904 /* we're treating error on bsg register as non-fatal, 905 * so pretend nothing went wrong */ 906 sdev_printk(KERN_INFO, sdev, 907 "Failed to register bsg queue, errno=%d\n", error); 908 909 /* add additional host specific attributes */ 910 if (sdev->host->hostt->sdev_attrs) { 911 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 912 error = device_create_file(&sdev->sdev_gendev, 913 sdev->host->hostt->sdev_attrs[i]); 914 if (error) 915 return error; 916 } 917 } 918 919 return error; 920} 921 922void __scsi_remove_device(struct scsi_device *sdev) 923{ 924 struct device *dev = &sdev->sdev_gendev; 925 926 if (sdev->is_visible) { 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 } else 935 put_device(&sdev->sdev_dev); 936 scsi_device_set_state(sdev, SDEV_DEL); 937 if (sdev->host->hostt->slave_destroy) 938 sdev->host->hostt->slave_destroy(sdev); 939 transport_destroy_device(dev); 940 put_device(dev); 941} 942 943/** 944 * scsi_remove_device - unregister a device from the scsi bus 945 * @sdev: scsi_device to unregister 946 **/ 947void scsi_remove_device(struct scsi_device *sdev) 948{ 949 struct Scsi_Host *shost = sdev->host; 950 951 mutex_lock(&shost->scan_mutex); 952 __scsi_remove_device(sdev); 953 mutex_unlock(&shost->scan_mutex); 954} 955EXPORT_SYMBOL(scsi_remove_device); 956 957static void __scsi_remove_target(struct scsi_target *starget) 958{ 959 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 960 unsigned long flags; 961 struct scsi_device *sdev; 962 963 spin_lock_irqsave(shost->host_lock, flags); 964 starget->reap_ref++; 965 restart: 966 list_for_each_entry(sdev, &shost->__devices, siblings) { 967 if (sdev->channel != starget->channel || 968 sdev->id != starget->id || 969 scsi_device_get(sdev)) 970 continue; 971 spin_unlock_irqrestore(shost->host_lock, flags); 972 scsi_remove_device(sdev); 973 scsi_device_put(sdev); 974 spin_lock_irqsave(shost->host_lock, flags); 975 goto restart; 976 } 977 spin_unlock_irqrestore(shost->host_lock, flags); 978 scsi_target_reap(starget); 979} 980 981static int __remove_child (struct device * dev, void * data) 982{ 983 if (scsi_is_target_device(dev)) 984 __scsi_remove_target(to_scsi_target(dev)); 985 return 0; 986} 987 988/** 989 * scsi_remove_target - try to remove a target and all its devices 990 * @dev: generic starget or parent of generic stargets to be removed 991 * 992 * Note: This is slightly racy. It is possible that if the user 993 * requests the addition of another device then the target won't be 994 * removed. 995 */ 996void scsi_remove_target(struct device *dev) 997{ 998 if (scsi_is_target_device(dev)) { 999 __scsi_remove_target(to_scsi_target(dev)); 1000 return; 1001 } 1002 1003 get_device(dev); 1004 device_for_each_child(dev, NULL, __remove_child); 1005 put_device(dev); 1006} 1007EXPORT_SYMBOL(scsi_remove_target); 1008 1009int scsi_register_driver(struct device_driver *drv) 1010{ 1011 drv->bus = &scsi_bus_type; 1012 1013 return driver_register(drv); 1014} 1015EXPORT_SYMBOL(scsi_register_driver); 1016 1017int scsi_register_interface(struct class_interface *intf) 1018{ 1019 intf->class = &sdev_class; 1020 1021 return class_interface_register(intf); 1022} 1023EXPORT_SYMBOL(scsi_register_interface); 1024 1025/** 1026 * scsi_sysfs_add_host - add scsi host to subsystem 1027 * @shost: scsi host struct to add to subsystem 1028 **/ 1029int scsi_sysfs_add_host(struct Scsi_Host *shost) 1030{ 1031 int error, i; 1032 1033 /* add host specific attributes */ 1034 if (shost->hostt->shost_attrs) { 1035 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 1036 error = device_create_file(&shost->shost_dev, 1037 shost->hostt->shost_attrs[i]); 1038 if (error) 1039 return error; 1040 } 1041 } 1042 1043 transport_register_device(&shost->shost_gendev); 1044 transport_configure_device(&shost->shost_gendev); 1045 return 0; 1046} 1047 1048static struct device_type scsi_dev_type = { 1049 .name = "scsi_device", 1050 .release = scsi_device_dev_release, 1051 .groups = scsi_sdev_attr_groups, 1052}; 1053 1054void scsi_sysfs_device_initialize(struct scsi_device *sdev) 1055{ 1056 unsigned long flags; 1057 struct Scsi_Host *shost = sdev->host; 1058 struct scsi_target *starget = sdev->sdev_target; 1059 1060 device_initialize(&sdev->sdev_gendev); 1061 sdev->sdev_gendev.bus = &scsi_bus_type; 1062 sdev->sdev_gendev.type = &scsi_dev_type; 1063 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d", 1064 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1065 1066 device_initialize(&sdev->sdev_dev); 1067 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev); 1068 sdev->sdev_dev.class = &sdev_class; 1069 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d", 1070 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1071 sdev->scsi_level = starget->scsi_level; 1072 transport_setup_device(&sdev->sdev_gendev); 1073 spin_lock_irqsave(shost->host_lock, flags); 1074 list_add_tail(&sdev->same_target_siblings, &starget->devices); 1075 list_add_tail(&sdev->siblings, &shost->__devices); 1076 spin_unlock_irqrestore(shost->host_lock, flags); 1077} 1078 1079int scsi_is_sdev_device(const struct device *dev) 1080{ 1081 return dev->type == &scsi_dev_type; 1082} 1083EXPORT_SYMBOL(scsi_is_sdev_device); 1084 1085/* A blank transport template that is used in drivers that don't 1086 * yet implement Transport Attributes */ 1087struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1088