scsi_sysfs.c revision d52b3815a52456dcf1a45fbc344e23bb643b2bda
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 const struct { 25 enum scsi_device_state value; 26 char *name; 27} sdev_states[] = { 28 { SDEV_CREATED, "created" }, 29 { SDEV_RUNNING, "running" }, 30 { SDEV_CANCEL, "cancel" }, 31 { SDEV_DEL, "deleted" }, 32 { SDEV_QUIESCE, "quiesce" }, 33 { SDEV_OFFLINE, "offline" }, 34 { SDEV_BLOCK, "blocked" }, 35}; 36 37const char *scsi_device_state_name(enum scsi_device_state state) 38{ 39 int i; 40 char *name = NULL; 41 42 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 43 if (sdev_states[i].value == state) { 44 name = sdev_states[i].name; 45 break; 46 } 47 } 48 return name; 49} 50 51static const struct { 52 enum scsi_host_state value; 53 char *name; 54} shost_states[] = { 55 { SHOST_CREATED, "created" }, 56 { SHOST_RUNNING, "running" }, 57 { SHOST_CANCEL, "cancel" }, 58 { SHOST_DEL, "deleted" }, 59 { SHOST_RECOVERY, "recovery" }, 60 { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, 61 { SHOST_DEL_RECOVERY, "deleted/recovery", }, 62}; 63const char *scsi_host_state_name(enum scsi_host_state state) 64{ 65 int i; 66 char *name = NULL; 67 68 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 69 if (shost_states[i].value == state) { 70 name = shost_states[i].name; 71 break; 72 } 73 } 74 return name; 75} 76 77static int check_set(unsigned int *val, char *src) 78{ 79 char *last; 80 81 if (strncmp(src, "-", 20) == 0) { 82 *val = SCAN_WILD_CARD; 83 } else { 84 /* 85 * Doesn't check for int overflow 86 */ 87 *val = simple_strtoul(src, &last, 0); 88 if (*last != '\0') 89 return 1; 90 } 91 return 0; 92} 93 94static int scsi_scan(struct Scsi_Host *shost, const char *str) 95{ 96 char s1[15], s2[15], s3[15], junk; 97 unsigned int channel, id, lun; 98 int res; 99 100 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk); 101 if (res != 3) 102 return -EINVAL; 103 if (check_set(&channel, s1)) 104 return -EINVAL; 105 if (check_set(&id, s2)) 106 return -EINVAL; 107 if (check_set(&lun, s3)) 108 return -EINVAL; 109 if (shost->transportt->user_scan) 110 res = shost->transportt->user_scan(shost, channel, id, lun); 111 else 112 res = scsi_scan_host_selected(shost, channel, id, lun, 1); 113 return res; 114} 115 116/* 117 * shost_show_function: macro to create an attr function that can be used to 118 * show a non-bit field. 119 */ 120#define shost_show_function(name, field, format_string) \ 121static ssize_t \ 122show_##name (struct class_device *class_dev, char *buf) \ 123{ \ 124 struct Scsi_Host *shost = class_to_shost(class_dev); \ 125 return snprintf (buf, 20, format_string, shost->field); \ 126} 127 128/* 129 * shost_rd_attr: macro to create a function and attribute variable for a 130 * read only field. 131 */ 132#define shost_rd_attr2(name, field, format_string) \ 133 shost_show_function(name, field, format_string) \ 134static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 135 136#define shost_rd_attr(field, format_string) \ 137shost_rd_attr2(field, field, format_string) 138 139/* 140 * Create the actual show/store functions and data structures. 141 */ 142 143static ssize_t store_scan(struct class_device *class_dev, const char *buf, 144 size_t count) 145{ 146 struct Scsi_Host *shost = class_to_shost(class_dev); 147 int res; 148 149 res = scsi_scan(shost, buf); 150 if (res == 0) 151 res = count; 152 return res; 153}; 154static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); 155 156static ssize_t 157store_shost_state(struct class_device *class_dev, const char *buf, size_t count) 158{ 159 int i; 160 struct Scsi_Host *shost = class_to_shost(class_dev); 161 enum scsi_host_state state = 0; 162 163 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 164 const int len = strlen(shost_states[i].name); 165 if (strncmp(shost_states[i].name, buf, len) == 0 && 166 buf[len] == '\n') { 167 state = shost_states[i].value; 168 break; 169 } 170 } 171 if (!state) 172 return -EINVAL; 173 174 if (scsi_host_set_state(shost, state)) 175 return -EINVAL; 176 return count; 177} 178 179static ssize_t 180show_shost_state(struct class_device *class_dev, char *buf) 181{ 182 struct Scsi_Host *shost = class_to_shost(class_dev); 183 const char *name = scsi_host_state_name(shost->shost_state); 184 185 if (!name) 186 return -EINVAL; 187 188 return snprintf(buf, 20, "%s\n", name); 189} 190 191static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); 192 193static ssize_t 194show_shost_mode(unsigned int mode, char *buf) 195{ 196 ssize_t len = 0; 197 198 if (mode & MODE_INITIATOR) 199 len = sprintf(buf, "%s", "Initiator"); 200 201 if (mode & MODE_TARGET) 202 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); 203 204 len += sprintf(buf + len, "\n"); 205 206 return len; 207} 208 209static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf) 210{ 211 struct Scsi_Host *shost = class_to_shost(class_dev); 212 unsigned int supported_mode = shost->hostt->supported_mode; 213 214 if (supported_mode == MODE_UNKNOWN) 215 /* by default this should be initiator */ 216 supported_mode = MODE_INITIATOR; 217 218 return show_shost_mode(supported_mode, buf); 219} 220 221static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); 222 223static ssize_t show_shost_active_mode(struct class_device *class_dev, char *buf) 224{ 225 struct Scsi_Host *shost = class_to_shost(class_dev); 226 227 if (shost->active_mode == MODE_UNKNOWN) 228 return snprintf(buf, 20, "unknown\n"); 229 else 230 return show_shost_mode(shost->active_mode, buf); 231} 232 233static CLASS_DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); 234 235shost_rd_attr(unique_id, "%u\n"); 236shost_rd_attr(host_busy, "%hu\n"); 237shost_rd_attr(cmd_per_lun, "%hd\n"); 238shost_rd_attr(can_queue, "%hd\n"); 239shost_rd_attr(sg_tablesize, "%hu\n"); 240shost_rd_attr(unchecked_isa_dma, "%d\n"); 241shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 242 243static struct class_device_attribute *scsi_sysfs_shost_attrs[] = { 244 &class_device_attr_unique_id, 245 &class_device_attr_host_busy, 246 &class_device_attr_cmd_per_lun, 247 &class_device_attr_can_queue, 248 &class_device_attr_sg_tablesize, 249 &class_device_attr_unchecked_isa_dma, 250 &class_device_attr_proc_name, 251 &class_device_attr_scan, 252 &class_device_attr_state, 253 &class_device_attr_supported_mode, 254 &class_device_attr_active_mode, 255 NULL 256}; 257 258static void scsi_device_cls_release(struct class_device *class_dev) 259{ 260 struct scsi_device *sdev; 261 262 sdev = class_to_sdev(class_dev); 263 put_device(&sdev->sdev_gendev); 264} 265 266static void scsi_device_dev_release_usercontext(struct work_struct *work) 267{ 268 struct scsi_device *sdev; 269 struct device *parent; 270 struct scsi_target *starget; 271 struct list_head *this, *tmp; 272 unsigned long flags; 273 274 sdev = container_of(work, struct scsi_device, ew.work); 275 276 parent = sdev->sdev_gendev.parent; 277 starget = to_scsi_target(parent); 278 279 spin_lock_irqsave(sdev->host->host_lock, flags); 280 starget->reap_ref++; 281 list_del(&sdev->siblings); 282 list_del(&sdev->same_target_siblings); 283 list_del(&sdev->starved_entry); 284 spin_unlock_irqrestore(sdev->host->host_lock, flags); 285 286 cancel_work_sync(&sdev->event_work); 287 288 list_for_each_safe(this, tmp, &sdev->event_list) { 289 struct scsi_event *evt; 290 291 evt = list_entry(this, struct scsi_event, node); 292 list_del(&evt->node); 293 kfree(evt); 294 } 295 296 if (sdev->request_queue) { 297 sdev->request_queue->queuedata = NULL; 298 /* user context needed to free queue */ 299 scsi_free_queue(sdev->request_queue); 300 /* temporary expedient, try to catch use of queue lock 301 * after free of sdev */ 302 sdev->request_queue = NULL; 303 } 304 305 scsi_target_reap(scsi_target(sdev)); 306 307 kfree(sdev->inquiry); 308 kfree(sdev); 309 310 if (parent) 311 put_device(parent); 312} 313 314static void scsi_device_dev_release(struct device *dev) 315{ 316 struct scsi_device *sdp = to_scsi_device(dev); 317 execute_in_process_context(scsi_device_dev_release_usercontext, 318 &sdp->ew); 319} 320 321static struct class sdev_class = { 322 .name = "scsi_device", 323 .release = scsi_device_cls_release, 324}; 325 326/* all probing is done in the individual ->probe routines */ 327static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 328{ 329 struct scsi_device *sdp = to_scsi_device(dev); 330 if (sdp->no_uld_attach) 331 return 0; 332 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 333} 334 335static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 336{ 337 struct scsi_device *sdev = to_scsi_device(dev); 338 339 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 340 return 0; 341} 342 343static int scsi_bus_suspend(struct device * dev, pm_message_t state) 344{ 345 struct device_driver *drv = dev->driver; 346 struct scsi_device *sdev = to_scsi_device(dev); 347 int err; 348 349 err = scsi_device_quiesce(sdev); 350 if (err) 351 return err; 352 353 if (drv && drv->suspend) { 354 err = drv->suspend(dev, state); 355 if (err) 356 return err; 357 } 358 359 return 0; 360} 361 362static int scsi_bus_resume(struct device * dev) 363{ 364 struct device_driver *drv = dev->driver; 365 struct scsi_device *sdev = to_scsi_device(dev); 366 int err = 0; 367 368 if (drv && drv->resume) 369 err = drv->resume(dev); 370 371 scsi_device_resume(sdev); 372 373 return err; 374} 375 376static int scsi_bus_remove(struct device *dev) 377{ 378 struct device_driver *drv = dev->driver; 379 struct scsi_device *sdev = to_scsi_device(dev); 380 int err = 0; 381 382 /* reset the prep_fn back to the default since the 383 * driver may have altered it and it's being removed */ 384 blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn); 385 386 if (drv && drv->remove) 387 err = drv->remove(dev); 388 389 return 0; 390} 391 392struct bus_type scsi_bus_type = { 393 .name = "scsi", 394 .match = scsi_bus_match, 395 .uevent = scsi_bus_uevent, 396 .suspend = scsi_bus_suspend, 397 .resume = scsi_bus_resume, 398 .remove = scsi_bus_remove, 399}; 400 401int scsi_sysfs_register(void) 402{ 403 int error; 404 405 error = bus_register(&scsi_bus_type); 406 if (!error) { 407 error = class_register(&sdev_class); 408 if (error) 409 bus_unregister(&scsi_bus_type); 410 } 411 412 return error; 413} 414 415void scsi_sysfs_unregister(void) 416{ 417 class_unregister(&sdev_class); 418 bus_unregister(&scsi_bus_type); 419} 420 421/* 422 * sdev_show_function: macro to create an attr function that can be used to 423 * show a non-bit field. 424 */ 425#define sdev_show_function(field, format_string) \ 426static ssize_t \ 427sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \ 428{ \ 429 struct scsi_device *sdev; \ 430 sdev = to_scsi_device(dev); \ 431 return snprintf (buf, 20, format_string, sdev->field); \ 432} \ 433 434/* 435 * sdev_rd_attr: macro to create a function and attribute variable for a 436 * read only field. 437 */ 438#define sdev_rd_attr(field, format_string) \ 439 sdev_show_function(field, format_string) \ 440static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 441 442 443/* 444 * sdev_rd_attr: create a function and attribute variable for a 445 * read/write field. 446 */ 447#define sdev_rw_attr(field, format_string) \ 448 sdev_show_function(field, format_string) \ 449 \ 450static ssize_t \ 451sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 452{ \ 453 struct scsi_device *sdev; \ 454 sdev = to_scsi_device(dev); \ 455 snscanf (buf, 20, format_string, &sdev->field); \ 456 return count; \ 457} \ 458static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 459 460/* Currently we don't export bit fields, but we might in future, 461 * so leave this code in */ 462#if 0 463/* 464 * sdev_rd_attr: create a function and attribute variable for a 465 * read/write bit field. 466 */ 467#define sdev_rw_attr_bit(field) \ 468 sdev_show_function(field, "%d\n") \ 469 \ 470static ssize_t \ 471sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 472{ \ 473 int ret; \ 474 struct scsi_device *sdev; \ 475 ret = scsi_sdev_check_buf_bit(buf); \ 476 if (ret >= 0) { \ 477 sdev = to_scsi_device(dev); \ 478 sdev->field = ret; \ 479 ret = count; \ 480 } \ 481 return ret; \ 482} \ 483static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 484 485/* 486 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 487 * else return -EINVAL. 488 */ 489static int scsi_sdev_check_buf_bit(const char *buf) 490{ 491 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 492 if (buf[0] == '1') 493 return 1; 494 else if (buf[0] == '0') 495 return 0; 496 else 497 return -EINVAL; 498 } else 499 return -EINVAL; 500} 501#endif 502/* 503 * Create the actual show/store functions and data structures. 504 */ 505sdev_rd_attr (device_blocked, "%d\n"); 506sdev_rd_attr (queue_depth, "%d\n"); 507sdev_rd_attr (type, "%d\n"); 508sdev_rd_attr (scsi_level, "%d\n"); 509sdev_rd_attr (vendor, "%.8s\n"); 510sdev_rd_attr (model, "%.16s\n"); 511sdev_rd_attr (rev, "%.4s\n"); 512 513static ssize_t 514sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 515{ 516 struct scsi_device *sdev; 517 sdev = to_scsi_device(dev); 518 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 519} 520 521static ssize_t 522sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 523{ 524 struct scsi_device *sdev; 525 int timeout; 526 sdev = to_scsi_device(dev); 527 sscanf (buf, "%d\n", &timeout); 528 sdev->timeout = timeout * HZ; 529 return count; 530} 531static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 532 533static ssize_t 534store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 535{ 536 scsi_rescan_device(dev); 537 return count; 538} 539static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 540 541static void sdev_store_delete_callback(struct device *dev) 542{ 543 scsi_remove_device(to_scsi_device(dev)); 544} 545 546static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 547 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, const char *buf, size_t count) 563{ 564 int i; 565 struct scsi_device *sdev = to_scsi_device(dev); 566 enum scsi_device_state state = 0; 567 568 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 569 const int len = strlen(sdev_states[i].name); 570 if (strncmp(sdev_states[i].name, buf, len) == 0 && 571 buf[len] == '\n') { 572 state = sdev_states[i].value; 573 break; 574 } 575 } 576 if (!state) 577 return -EINVAL; 578 579 if (scsi_device_set_state(sdev, state)) 580 return -EINVAL; 581 return count; 582} 583 584static ssize_t 585show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 586{ 587 struct scsi_device *sdev = to_scsi_device(dev); 588 const char *name = scsi_device_state_name(sdev->sdev_state); 589 590 if (!name) 591 return -EINVAL; 592 593 return snprintf(buf, 20, "%s\n", name); 594} 595 596static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 597 598static ssize_t 599show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf) 600{ 601 struct scsi_device *sdev = to_scsi_device(dev); 602 const char *name = "none"; 603 604 if (sdev->ordered_tags) 605 name = "ordered"; 606 else if (sdev->simple_tags) 607 name = "simple"; 608 609 return snprintf(buf, 20, "%s\n", name); 610} 611 612static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 613 614static ssize_t 615show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 616{ 617 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 618} 619 620static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 621 622#define show_sdev_iostat(field) \ 623static ssize_t \ 624show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \ 625{ \ 626 struct scsi_device *sdev = to_scsi_device(dev); \ 627 unsigned long long count = atomic_read(&sdev->field); \ 628 return snprintf(buf, 20, "0x%llx\n", count); \ 629} \ 630static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 631 632show_sdev_iostat(iorequest_cnt); 633show_sdev_iostat(iodone_cnt); 634show_sdev_iostat(ioerr_cnt); 635 636static ssize_t 637sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 638{ 639 struct scsi_device *sdev; 640 sdev = to_scsi_device(dev); 641 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 642} 643static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 644 645#define DECLARE_EVT_SHOW(name, Cap_name) \ 646static ssize_t \ 647sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ 648 char *buf) \ 649{ \ 650 struct scsi_device *sdev = to_scsi_device(dev); \ 651 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ 652 return snprintf(buf, 20, "%d\n", val); \ 653} 654 655#define DECLARE_EVT_STORE(name, Cap_name) \ 656static ssize_t \ 657sdev_store_evt_##name(struct device *dev, struct device_attribute *attr, \ 658 const char *buf, size_t count) \ 659{ \ 660 struct scsi_device *sdev = to_scsi_device(dev); \ 661 int val = simple_strtoul(buf, NULL, 0); \ 662 if (val == 0) \ 663 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 664 else if (val == 1) \ 665 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 666 else \ 667 return -EINVAL; \ 668 return count; \ 669} 670 671#define DECLARE_EVT(name, Cap_name) \ 672 DECLARE_EVT_SHOW(name, Cap_name) \ 673 DECLARE_EVT_STORE(name, Cap_name) \ 674 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ 675 sdev_store_evt_##name); 676#define REF_EVT(name) &dev_attr_evt_##name.attr 677 678DECLARE_EVT(media_change, MEDIA_CHANGE) 679 680/* Default template for device attributes. May NOT be modified */ 681static struct attribute *scsi_sdev_attrs[] = { 682 &dev_attr_device_blocked.attr, 683 &dev_attr_type.attr, 684 &dev_attr_scsi_level.attr, 685 &dev_attr_vendor.attr, 686 &dev_attr_model.attr, 687 &dev_attr_rev.attr, 688 &dev_attr_rescan.attr, 689 &dev_attr_delete.attr, 690 &dev_attr_state.attr, 691 &dev_attr_timeout.attr, 692 &dev_attr_iocounterbits.attr, 693 &dev_attr_iorequest_cnt.attr, 694 &dev_attr_iodone_cnt.attr, 695 &dev_attr_ioerr_cnt.attr, 696 &dev_attr_modalias.attr, 697 REF_EVT(media_change), 698 NULL 699}; 700 701static struct attribute_group scsi_sdev_attr_group = { 702 .attrs = scsi_sdev_attrs, 703}; 704 705static struct attribute_group *scsi_sdev_attr_groups[] = { 706 &scsi_sdev_attr_group, 707 NULL 708}; 709 710static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf, 711 size_t count) 712{ 713 int depth, retval; 714 struct scsi_device *sdev = to_scsi_device(dev); 715 struct scsi_host_template *sht = sdev->host->hostt; 716 717 if (!sht->change_queue_depth) 718 return -EINVAL; 719 720 depth = simple_strtoul(buf, NULL, 0); 721 722 if (depth < 1) 723 return -EINVAL; 724 725 retval = sht->change_queue_depth(sdev, depth); 726 if (retval < 0) 727 return retval; 728 729 return count; 730} 731 732static struct device_attribute sdev_attr_queue_depth_rw = 733 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 734 sdev_store_queue_depth_rw); 735 736static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, 737 size_t count) 738{ 739 struct scsi_device *sdev = to_scsi_device(dev); 740 struct scsi_host_template *sht = sdev->host->hostt; 741 int tag_type = 0, retval; 742 int prev_tag_type = scsi_get_tag_type(sdev); 743 744 if (!sdev->tagged_supported || !sht->change_queue_type) 745 return -EINVAL; 746 747 if (strncmp(buf, "ordered", 7) == 0) 748 tag_type = MSG_ORDERED_TAG; 749 else if (strncmp(buf, "simple", 6) == 0) 750 tag_type = MSG_SIMPLE_TAG; 751 else if (strncmp(buf, "none", 4) != 0) 752 return -EINVAL; 753 754 if (tag_type == prev_tag_type) 755 return count; 756 757 retval = sht->change_queue_type(sdev, tag_type); 758 if (retval < 0) 759 return retval; 760 761 return count; 762} 763 764static struct device_attribute sdev_attr_queue_type_rw = 765 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 766 sdev_store_queue_type_rw); 767 768/** 769 * scsi_sysfs_add_sdev - add scsi device to sysfs 770 * @sdev: scsi_device to add 771 * 772 * Return value: 773 * 0 on Success / non-zero on Failure 774 **/ 775int scsi_sysfs_add_sdev(struct scsi_device *sdev) 776{ 777 int error, i; 778 struct request_queue *rq = sdev->request_queue; 779 780 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 781 return error; 782 783 error = device_add(&sdev->sdev_gendev); 784 if (error) { 785 put_device(sdev->sdev_gendev.parent); 786 printk(KERN_INFO "error 1\n"); 787 return error; 788 } 789 error = class_device_add(&sdev->sdev_classdev); 790 if (error) { 791 printk(KERN_INFO "error 2\n"); 792 goto clean_device; 793 } 794 795 /* take a reference for the sdev_classdev; this is 796 * released by the sdev_class .release */ 797 get_device(&sdev->sdev_gendev); 798 799 /* create queue files, which may be writable, depending on the host */ 800 if (sdev->host->hostt->change_queue_depth) 801 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw); 802 else 803 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth); 804 if (error) { 805 __scsi_remove_device(sdev); 806 goto out; 807 } 808 if (sdev->host->hostt->change_queue_type) 809 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw); 810 else 811 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type); 812 if (error) { 813 __scsi_remove_device(sdev); 814 goto out; 815 } 816 817 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL); 818 819 if (error) 820 sdev_printk(KERN_INFO, sdev, 821 "Failed to register bsg queue, errno=%d\n", error); 822 823 /* we're treating error on bsg register as non-fatal, so pretend 824 * nothing went wrong */ 825 error = 0; 826 827 /* add additional host specific attributes */ 828 if (sdev->host->hostt->sdev_attrs) { 829 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 830 error = device_create_file(&sdev->sdev_gendev, 831 sdev->host->hostt->sdev_attrs[i]); 832 if (error) { 833 __scsi_remove_device(sdev); 834 goto out; 835 } 836 } 837 } 838 839 transport_add_device(&sdev->sdev_gendev); 840 out: 841 return error; 842 843 clean_device: 844 scsi_device_set_state(sdev, SDEV_CANCEL); 845 846 device_del(&sdev->sdev_gendev); 847 transport_destroy_device(&sdev->sdev_gendev); 848 put_device(&sdev->sdev_gendev); 849 850 return error; 851} 852 853void __scsi_remove_device(struct scsi_device *sdev) 854{ 855 struct device *dev = &sdev->sdev_gendev; 856 857 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 858 return; 859 860 bsg_unregister_queue(sdev->request_queue); 861 class_device_unregister(&sdev->sdev_classdev); 862 transport_remove_device(dev); 863 device_del(dev); 864 scsi_device_set_state(sdev, SDEV_DEL); 865 if (sdev->host->hostt->slave_destroy) 866 sdev->host->hostt->slave_destroy(sdev); 867 transport_destroy_device(dev); 868 put_device(dev); 869} 870 871/** 872 * scsi_remove_device - unregister a device from the scsi bus 873 * @sdev: scsi_device to unregister 874 **/ 875void scsi_remove_device(struct scsi_device *sdev) 876{ 877 struct Scsi_Host *shost = sdev->host; 878 879 mutex_lock(&shost->scan_mutex); 880 __scsi_remove_device(sdev); 881 mutex_unlock(&shost->scan_mutex); 882} 883EXPORT_SYMBOL(scsi_remove_device); 884 885static void __scsi_remove_target(struct scsi_target *starget) 886{ 887 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 888 unsigned long flags; 889 struct scsi_device *sdev; 890 891 spin_lock_irqsave(shost->host_lock, flags); 892 starget->reap_ref++; 893 restart: 894 list_for_each_entry(sdev, &shost->__devices, siblings) { 895 if (sdev->channel != starget->channel || 896 sdev->id != starget->id || 897 sdev->sdev_state == SDEV_DEL) 898 continue; 899 spin_unlock_irqrestore(shost->host_lock, flags); 900 scsi_remove_device(sdev); 901 spin_lock_irqsave(shost->host_lock, flags); 902 goto restart; 903 } 904 spin_unlock_irqrestore(shost->host_lock, flags); 905 scsi_target_reap(starget); 906} 907 908static int __remove_child (struct device * dev, void * data) 909{ 910 if (scsi_is_target_device(dev)) 911 __scsi_remove_target(to_scsi_target(dev)); 912 return 0; 913} 914 915/** 916 * scsi_remove_target - try to remove a target and all its devices 917 * @dev: generic starget or parent of generic stargets to be removed 918 * 919 * Note: This is slightly racy. It is possible that if the user 920 * requests the addition of another device then the target won't be 921 * removed. 922 */ 923void scsi_remove_target(struct device *dev) 924{ 925 struct device *rdev; 926 927 if (scsi_is_target_device(dev)) { 928 __scsi_remove_target(to_scsi_target(dev)); 929 return; 930 } 931 932 rdev = get_device(dev); 933 device_for_each_child(dev, NULL, __remove_child); 934 put_device(rdev); 935} 936EXPORT_SYMBOL(scsi_remove_target); 937 938int scsi_register_driver(struct device_driver *drv) 939{ 940 drv->bus = &scsi_bus_type; 941 942 return driver_register(drv); 943} 944EXPORT_SYMBOL(scsi_register_driver); 945 946int scsi_register_interface(struct class_interface *intf) 947{ 948 intf->class = &sdev_class; 949 950 return class_interface_register(intf); 951} 952EXPORT_SYMBOL(scsi_register_interface); 953 954 955static struct class_device_attribute *class_attr_overridden( 956 struct class_device_attribute **attrs, 957 struct class_device_attribute *attr) 958{ 959 int i; 960 961 if (!attrs) 962 return NULL; 963 for (i = 0; attrs[i]; i++) 964 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 965 return attrs[i]; 966 return NULL; 967} 968 969static int class_attr_add(struct class_device *classdev, 970 struct class_device_attribute *attr) 971{ 972 struct class_device_attribute *base_attr; 973 974 /* 975 * Spare the caller from having to copy things it's not interested in. 976 */ 977 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); 978 if (base_attr) { 979 /* extend permissions */ 980 attr->attr.mode |= base_attr->attr.mode; 981 982 /* override null show/store with default */ 983 if (!attr->show) 984 attr->show = base_attr->show; 985 if (!attr->store) 986 attr->store = base_attr->store; 987 } 988 989 return class_device_create_file(classdev, attr); 990} 991 992/** 993 * scsi_sysfs_add_host - add scsi host to subsystem 994 * @shost: scsi host struct to add to subsystem 995 * @dev: parent struct device pointer 996 **/ 997int scsi_sysfs_add_host(struct Scsi_Host *shost) 998{ 999 int error, i; 1000 1001 if (shost->hostt->shost_attrs) { 1002 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 1003 error = class_attr_add(&shost->shost_classdev, 1004 shost->hostt->shost_attrs[i]); 1005 if (error) 1006 return error; 1007 } 1008 } 1009 1010 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { 1011 if (!class_attr_overridden(shost->hostt->shost_attrs, 1012 scsi_sysfs_shost_attrs[i])) { 1013 error = class_device_create_file(&shost->shost_classdev, 1014 scsi_sysfs_shost_attrs[i]); 1015 if (error) 1016 return error; 1017 } 1018 } 1019 1020 transport_register_device(&shost->shost_gendev); 1021 transport_configure_device(&shost->shost_gendev); 1022 return 0; 1023} 1024 1025static struct device_type scsi_dev_type = { 1026 .name = "scsi_device", 1027 .release = scsi_device_dev_release, 1028 .groups = scsi_sdev_attr_groups, 1029}; 1030 1031void scsi_sysfs_device_initialize(struct scsi_device *sdev) 1032{ 1033 unsigned long flags; 1034 struct Scsi_Host *shost = sdev->host; 1035 struct scsi_target *starget = sdev->sdev_target; 1036 1037 device_initialize(&sdev->sdev_gendev); 1038 sdev->sdev_gendev.bus = &scsi_bus_type; 1039 sdev->sdev_gendev.type = &scsi_dev_type; 1040 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 1041 sdev->host->host_no, sdev->channel, sdev->id, 1042 sdev->lun); 1043 1044 class_device_initialize(&sdev->sdev_classdev); 1045 sdev->sdev_classdev.dev = &sdev->sdev_gendev; 1046 sdev->sdev_classdev.class = &sdev_class; 1047 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, 1048 "%d:%d:%d:%d", sdev->host->host_no, 1049 sdev->channel, sdev->id, sdev->lun); 1050 sdev->scsi_level = starget->scsi_level; 1051 transport_setup_device(&sdev->sdev_gendev); 1052 spin_lock_irqsave(shost->host_lock, flags); 1053 list_add_tail(&sdev->same_target_siblings, &starget->devices); 1054 list_add_tail(&sdev->siblings, &shost->__devices); 1055 spin_unlock_irqrestore(shost->host_lock, flags); 1056} 1057 1058int scsi_is_sdev_device(const struct device *dev) 1059{ 1060 return dev->type == &scsi_dev_type; 1061} 1062EXPORT_SYMBOL(scsi_is_sdev_device); 1063 1064/* A blank transport template that is used in drivers that don't 1065 * yet implement Transport Attributes */ 1066struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1067