scsi_sysfs.c revision 7a39ac3f25bef018862a991d754aff681c019127
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 unsigned long flags; 272 273 sdev = container_of(work, struct scsi_device, ew.work); 274 275 parent = sdev->sdev_gendev.parent; 276 starget = to_scsi_target(parent); 277 278 spin_lock_irqsave(sdev->host->host_lock, flags); 279 starget->reap_ref++; 280 list_del(&sdev->siblings); 281 list_del(&sdev->same_target_siblings); 282 list_del(&sdev->starved_entry); 283 spin_unlock_irqrestore(sdev->host->host_lock, flags); 284 285 if (sdev->request_queue) { 286 sdev->request_queue->queuedata = NULL; 287 /* user context needed to free queue */ 288 scsi_free_queue(sdev->request_queue); 289 /* temporary expedient, try to catch use of queue lock 290 * after free of sdev */ 291 sdev->request_queue = NULL; 292 } 293 294 scsi_target_reap(scsi_target(sdev)); 295 296 kfree(sdev->inquiry); 297 kfree(sdev); 298 299 if (parent) 300 put_device(parent); 301} 302 303static void scsi_device_dev_release(struct device *dev) 304{ 305 struct scsi_device *sdp = to_scsi_device(dev); 306 execute_in_process_context(scsi_device_dev_release_usercontext, 307 &sdp->ew); 308} 309 310static struct class sdev_class = { 311 .name = "scsi_device", 312 .release = scsi_device_cls_release, 313}; 314 315/* all probing is done in the individual ->probe routines */ 316static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 317{ 318 struct scsi_device *sdp = to_scsi_device(dev); 319 if (sdp->no_uld_attach) 320 return 0; 321 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 322} 323 324static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 325{ 326 struct scsi_device *sdev = to_scsi_device(dev); 327 328 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 329 return 0; 330} 331 332static int scsi_bus_suspend(struct device * dev, pm_message_t state) 333{ 334 struct device_driver *drv = dev->driver; 335 struct scsi_device *sdev = to_scsi_device(dev); 336 int err; 337 338 err = scsi_device_quiesce(sdev); 339 if (err) 340 return err; 341 342 if (drv && drv->suspend) { 343 err = drv->suspend(dev, state); 344 if (err) 345 return err; 346 } 347 348 return 0; 349} 350 351static int scsi_bus_resume(struct device * dev) 352{ 353 struct device_driver *drv = dev->driver; 354 struct scsi_device *sdev = to_scsi_device(dev); 355 int err = 0; 356 357 if (drv && drv->resume) 358 err = drv->resume(dev); 359 360 scsi_device_resume(sdev); 361 362 return err; 363} 364 365struct bus_type scsi_bus_type = { 366 .name = "scsi", 367 .match = scsi_bus_match, 368 .uevent = scsi_bus_uevent, 369 .suspend = scsi_bus_suspend, 370 .resume = scsi_bus_resume, 371}; 372 373int scsi_sysfs_register(void) 374{ 375 int error; 376 377 error = bus_register(&scsi_bus_type); 378 if (!error) { 379 error = class_register(&sdev_class); 380 if (error) 381 bus_unregister(&scsi_bus_type); 382 } 383 384 return error; 385} 386 387void scsi_sysfs_unregister(void) 388{ 389 class_unregister(&sdev_class); 390 bus_unregister(&scsi_bus_type); 391} 392 393/* 394 * sdev_show_function: macro to create an attr function that can be used to 395 * show a non-bit field. 396 */ 397#define sdev_show_function(field, format_string) \ 398static ssize_t \ 399sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \ 400{ \ 401 struct scsi_device *sdev; \ 402 sdev = to_scsi_device(dev); \ 403 return snprintf (buf, 20, format_string, sdev->field); \ 404} \ 405 406/* 407 * sdev_rd_attr: macro to create a function and attribute variable for a 408 * read only field. 409 */ 410#define sdev_rd_attr(field, format_string) \ 411 sdev_show_function(field, format_string) \ 412static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 413 414 415/* 416 * sdev_rd_attr: create a function and attribute variable for a 417 * read/write field. 418 */ 419#define sdev_rw_attr(field, format_string) \ 420 sdev_show_function(field, format_string) \ 421 \ 422static ssize_t \ 423sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 424{ \ 425 struct scsi_device *sdev; \ 426 sdev = to_scsi_device(dev); \ 427 snscanf (buf, 20, format_string, &sdev->field); \ 428 return count; \ 429} \ 430static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 431 432/* Currently we don't export bit fields, but we might in future, 433 * so leave this code in */ 434#if 0 435/* 436 * sdev_rd_attr: create a function and attribute variable for a 437 * read/write bit field. 438 */ 439#define sdev_rw_attr_bit(field) \ 440 sdev_show_function(field, "%d\n") \ 441 \ 442static ssize_t \ 443sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 444{ \ 445 int ret; \ 446 struct scsi_device *sdev; \ 447 ret = scsi_sdev_check_buf_bit(buf); \ 448 if (ret >= 0) { \ 449 sdev = to_scsi_device(dev); \ 450 sdev->field = ret; \ 451 ret = count; \ 452 } \ 453 return ret; \ 454} \ 455static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 456 457/* 458 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 459 * else return -EINVAL. 460 */ 461static int scsi_sdev_check_buf_bit(const char *buf) 462{ 463 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 464 if (buf[0] == '1') 465 return 1; 466 else if (buf[0] == '0') 467 return 0; 468 else 469 return -EINVAL; 470 } else 471 return -EINVAL; 472} 473#endif 474/* 475 * Create the actual show/store functions and data structures. 476 */ 477sdev_rd_attr (device_blocked, "%d\n"); 478sdev_rd_attr (queue_depth, "%d\n"); 479sdev_rd_attr (type, "%d\n"); 480sdev_rd_attr (scsi_level, "%d\n"); 481sdev_rd_attr (vendor, "%.8s\n"); 482sdev_rd_attr (model, "%.16s\n"); 483sdev_rd_attr (rev, "%.4s\n"); 484 485static ssize_t 486sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 487{ 488 struct scsi_device *sdev; 489 sdev = to_scsi_device(dev); 490 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 491} 492 493static ssize_t 494sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 495{ 496 struct scsi_device *sdev; 497 int timeout; 498 sdev = to_scsi_device(dev); 499 sscanf (buf, "%d\n", &timeout); 500 sdev->timeout = timeout * HZ; 501 return count; 502} 503static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 504 505static ssize_t 506store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 507{ 508 scsi_rescan_device(dev); 509 return count; 510} 511static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 512 513static void sdev_store_delete_callback(struct device *dev) 514{ 515 scsi_remove_device(to_scsi_device(dev)); 516} 517 518static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 519 size_t count) 520{ 521 int rc; 522 523 /* An attribute cannot be unregistered by one of its own methods, 524 * so we have to use this roundabout approach. 525 */ 526 rc = device_schedule_callback(dev, sdev_store_delete_callback); 527 if (rc) 528 count = rc; 529 return count; 530}; 531static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 532 533static ssize_t 534store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 535{ 536 int i; 537 struct scsi_device *sdev = to_scsi_device(dev); 538 enum scsi_device_state state = 0; 539 540 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 541 const int len = strlen(sdev_states[i].name); 542 if (strncmp(sdev_states[i].name, buf, len) == 0 && 543 buf[len] == '\n') { 544 state = sdev_states[i].value; 545 break; 546 } 547 } 548 if (!state) 549 return -EINVAL; 550 551 if (scsi_device_set_state(sdev, state)) 552 return -EINVAL; 553 return count; 554} 555 556static ssize_t 557show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 558{ 559 struct scsi_device *sdev = to_scsi_device(dev); 560 const char *name = scsi_device_state_name(sdev->sdev_state); 561 562 if (!name) 563 return -EINVAL; 564 565 return snprintf(buf, 20, "%s\n", name); 566} 567 568static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 569 570static ssize_t 571show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf) 572{ 573 struct scsi_device *sdev = to_scsi_device(dev); 574 const char *name = "none"; 575 576 if (sdev->ordered_tags) 577 name = "ordered"; 578 else if (sdev->simple_tags) 579 name = "simple"; 580 581 return snprintf(buf, 20, "%s\n", name); 582} 583 584static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 585 586static ssize_t 587show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 588{ 589 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 590} 591 592static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 593 594#define show_sdev_iostat(field) \ 595static ssize_t \ 596show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \ 597{ \ 598 struct scsi_device *sdev = to_scsi_device(dev); \ 599 unsigned long long count = atomic_read(&sdev->field); \ 600 return snprintf(buf, 20, "0x%llx\n", count); \ 601} \ 602static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 603 604show_sdev_iostat(iorequest_cnt); 605show_sdev_iostat(iodone_cnt); 606show_sdev_iostat(ioerr_cnt); 607 608static ssize_t 609sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 610{ 611 struct scsi_device *sdev; 612 sdev = to_scsi_device(dev); 613 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 614} 615static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 616 617/* Default template for device attributes. May NOT be modified */ 618static struct attribute *scsi_sdev_attrs[] = { 619 &dev_attr_device_blocked.attr, 620 &dev_attr_type.attr, 621 &dev_attr_scsi_level.attr, 622 &dev_attr_vendor.attr, 623 &dev_attr_model.attr, 624 &dev_attr_rev.attr, 625 &dev_attr_rescan.attr, 626 &dev_attr_delete.attr, 627 &dev_attr_state.attr, 628 &dev_attr_timeout.attr, 629 &dev_attr_iocounterbits.attr, 630 &dev_attr_iorequest_cnt.attr, 631 &dev_attr_iodone_cnt.attr, 632 &dev_attr_ioerr_cnt.attr, 633 &dev_attr_modalias.attr, 634 NULL 635}; 636 637static struct attribute_group scsi_sdev_attr_group = { 638 .attrs = scsi_sdev_attrs, 639}; 640 641static struct attribute_group *scsi_sdev_attr_groups[] = { 642 &scsi_sdev_attr_group, 643 NULL 644}; 645 646static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf, 647 size_t count) 648{ 649 int depth, retval; 650 struct scsi_device *sdev = to_scsi_device(dev); 651 struct scsi_host_template *sht = sdev->host->hostt; 652 653 if (!sht->change_queue_depth) 654 return -EINVAL; 655 656 depth = simple_strtoul(buf, NULL, 0); 657 658 if (depth < 1) 659 return -EINVAL; 660 661 retval = sht->change_queue_depth(sdev, depth); 662 if (retval < 0) 663 return retval; 664 665 return count; 666} 667 668static struct device_attribute sdev_attr_queue_depth_rw = 669 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 670 sdev_store_queue_depth_rw); 671 672static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, 673 size_t count) 674{ 675 struct scsi_device *sdev = to_scsi_device(dev); 676 struct scsi_host_template *sht = sdev->host->hostt; 677 int tag_type = 0, retval; 678 int prev_tag_type = scsi_get_tag_type(sdev); 679 680 if (!sdev->tagged_supported || !sht->change_queue_type) 681 return -EINVAL; 682 683 if (strncmp(buf, "ordered", 7) == 0) 684 tag_type = MSG_ORDERED_TAG; 685 else if (strncmp(buf, "simple", 6) == 0) 686 tag_type = MSG_SIMPLE_TAG; 687 else if (strncmp(buf, "none", 4) != 0) 688 return -EINVAL; 689 690 if (tag_type == prev_tag_type) 691 return count; 692 693 retval = sht->change_queue_type(sdev, tag_type); 694 if (retval < 0) 695 return retval; 696 697 return count; 698} 699 700static struct device_attribute sdev_attr_queue_type_rw = 701 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 702 sdev_store_queue_type_rw); 703 704/** 705 * scsi_sysfs_add_sdev - add scsi device to sysfs 706 * @sdev: scsi_device to add 707 * 708 * Return value: 709 * 0 on Success / non-zero on Failure 710 **/ 711int scsi_sysfs_add_sdev(struct scsi_device *sdev) 712{ 713 int error, i; 714 struct request_queue *rq = sdev->request_queue; 715 716 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 717 return error; 718 719 error = device_add(&sdev->sdev_gendev); 720 if (error) { 721 put_device(sdev->sdev_gendev.parent); 722 printk(KERN_INFO "error 1\n"); 723 return error; 724 } 725 error = class_device_add(&sdev->sdev_classdev); 726 if (error) { 727 printk(KERN_INFO "error 2\n"); 728 goto clean_device; 729 } 730 731 /* take a reference for the sdev_classdev; this is 732 * released by the sdev_class .release */ 733 get_device(&sdev->sdev_gendev); 734 735 /* create queue files, which may be writable, depending on the host */ 736 if (sdev->host->hostt->change_queue_depth) 737 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw); 738 else 739 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth); 740 if (error) { 741 __scsi_remove_device(sdev); 742 goto out; 743 } 744 if (sdev->host->hostt->change_queue_type) 745 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw); 746 else 747 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type); 748 if (error) { 749 __scsi_remove_device(sdev); 750 goto out; 751 } 752 753 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL); 754 755 if (error) 756 sdev_printk(KERN_INFO, sdev, 757 "Failed to register bsg queue, errno=%d\n", error); 758 759 /* we're treating error on bsg register as non-fatal, so pretend 760 * nothing went wrong */ 761 error = 0; 762 763 /* add additional host specific attributes */ 764 if (sdev->host->hostt->sdev_attrs) { 765 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 766 error = device_create_file(&sdev->sdev_gendev, 767 sdev->host->hostt->sdev_attrs[i]); 768 if (error) { 769 __scsi_remove_device(sdev); 770 goto out; 771 } 772 } 773 } 774 775 transport_add_device(&sdev->sdev_gendev); 776 out: 777 return error; 778 779 clean_device: 780 scsi_device_set_state(sdev, SDEV_CANCEL); 781 782 device_del(&sdev->sdev_gendev); 783 transport_destroy_device(&sdev->sdev_gendev); 784 put_device(&sdev->sdev_gendev); 785 786 return error; 787} 788 789void __scsi_remove_device(struct scsi_device *sdev) 790{ 791 struct device *dev = &sdev->sdev_gendev; 792 793 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 794 return; 795 796 bsg_unregister_queue(sdev->request_queue); 797 class_device_unregister(&sdev->sdev_classdev); 798 transport_remove_device(dev); 799 device_del(dev); 800 scsi_device_set_state(sdev, SDEV_DEL); 801 if (sdev->host->hostt->slave_destroy) 802 sdev->host->hostt->slave_destroy(sdev); 803 transport_destroy_device(dev); 804 put_device(dev); 805} 806 807/** 808 * scsi_remove_device - unregister a device from the scsi bus 809 * @sdev: scsi_device to unregister 810 **/ 811void scsi_remove_device(struct scsi_device *sdev) 812{ 813 struct Scsi_Host *shost = sdev->host; 814 815 mutex_lock(&shost->scan_mutex); 816 __scsi_remove_device(sdev); 817 mutex_unlock(&shost->scan_mutex); 818} 819EXPORT_SYMBOL(scsi_remove_device); 820 821static void __scsi_remove_target(struct scsi_target *starget) 822{ 823 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 824 unsigned long flags; 825 struct scsi_device *sdev; 826 827 spin_lock_irqsave(shost->host_lock, flags); 828 starget->reap_ref++; 829 restart: 830 list_for_each_entry(sdev, &shost->__devices, siblings) { 831 if (sdev->channel != starget->channel || 832 sdev->id != starget->id || 833 sdev->sdev_state == SDEV_DEL) 834 continue; 835 spin_unlock_irqrestore(shost->host_lock, flags); 836 scsi_remove_device(sdev); 837 spin_lock_irqsave(shost->host_lock, flags); 838 goto restart; 839 } 840 spin_unlock_irqrestore(shost->host_lock, flags); 841 scsi_target_reap(starget); 842} 843 844static int __remove_child (struct device * dev, void * data) 845{ 846 if (scsi_is_target_device(dev)) 847 __scsi_remove_target(to_scsi_target(dev)); 848 return 0; 849} 850 851/** 852 * scsi_remove_target - try to remove a target and all its devices 853 * @dev: generic starget or parent of generic stargets to be removed 854 * 855 * Note: This is slightly racy. It is possible that if the user 856 * requests the addition of another device then the target won't be 857 * removed. 858 */ 859void scsi_remove_target(struct device *dev) 860{ 861 struct device *rdev; 862 863 if (scsi_is_target_device(dev)) { 864 __scsi_remove_target(to_scsi_target(dev)); 865 return; 866 } 867 868 rdev = get_device(dev); 869 device_for_each_child(dev, NULL, __remove_child); 870 put_device(rdev); 871} 872EXPORT_SYMBOL(scsi_remove_target); 873 874int scsi_register_driver(struct device_driver *drv) 875{ 876 drv->bus = &scsi_bus_type; 877 878 return driver_register(drv); 879} 880EXPORT_SYMBOL(scsi_register_driver); 881 882int scsi_register_interface(struct class_interface *intf) 883{ 884 intf->class = &sdev_class; 885 886 return class_interface_register(intf); 887} 888EXPORT_SYMBOL(scsi_register_interface); 889 890 891static struct class_device_attribute *class_attr_overridden( 892 struct class_device_attribute **attrs, 893 struct class_device_attribute *attr) 894{ 895 int i; 896 897 if (!attrs) 898 return NULL; 899 for (i = 0; attrs[i]; i++) 900 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 901 return attrs[i]; 902 return NULL; 903} 904 905static int class_attr_add(struct class_device *classdev, 906 struct class_device_attribute *attr) 907{ 908 struct class_device_attribute *base_attr; 909 910 /* 911 * Spare the caller from having to copy things it's not interested in. 912 */ 913 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); 914 if (base_attr) { 915 /* extend permissions */ 916 attr->attr.mode |= base_attr->attr.mode; 917 918 /* override null show/store with default */ 919 if (!attr->show) 920 attr->show = base_attr->show; 921 if (!attr->store) 922 attr->store = base_attr->store; 923 } 924 925 return class_device_create_file(classdev, attr); 926} 927 928/** 929 * scsi_sysfs_add_host - add scsi host to subsystem 930 * @shost: scsi host struct to add to subsystem 931 * @dev: parent struct device pointer 932 **/ 933int scsi_sysfs_add_host(struct Scsi_Host *shost) 934{ 935 int error, i; 936 937 if (shost->hostt->shost_attrs) { 938 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 939 error = class_attr_add(&shost->shost_classdev, 940 shost->hostt->shost_attrs[i]); 941 if (error) 942 return error; 943 } 944 } 945 946 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { 947 if (!class_attr_overridden(shost->hostt->shost_attrs, 948 scsi_sysfs_shost_attrs[i])) { 949 error = class_device_create_file(&shost->shost_classdev, 950 scsi_sysfs_shost_attrs[i]); 951 if (error) 952 return error; 953 } 954 } 955 956 transport_register_device(&shost->shost_gendev); 957 return 0; 958} 959 960static struct device_type scsi_dev_type = { 961 .name = "scsi_device", 962 .release = scsi_device_dev_release, 963 .groups = scsi_sdev_attr_groups, 964}; 965 966void scsi_sysfs_device_initialize(struct scsi_device *sdev) 967{ 968 unsigned long flags; 969 struct Scsi_Host *shost = sdev->host; 970 struct scsi_target *starget = sdev->sdev_target; 971 972 device_initialize(&sdev->sdev_gendev); 973 sdev->sdev_gendev.bus = &scsi_bus_type; 974 sdev->sdev_gendev.type = &scsi_dev_type; 975 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 976 sdev->host->host_no, sdev->channel, sdev->id, 977 sdev->lun); 978 979 class_device_initialize(&sdev->sdev_classdev); 980 sdev->sdev_classdev.dev = &sdev->sdev_gendev; 981 sdev->sdev_classdev.class = &sdev_class; 982 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, 983 "%d:%d:%d:%d", sdev->host->host_no, 984 sdev->channel, sdev->id, sdev->lun); 985 sdev->scsi_level = starget->scsi_level; 986 transport_setup_device(&sdev->sdev_gendev); 987 spin_lock_irqsave(shost->host_lock, flags); 988 list_add_tail(&sdev->same_target_siblings, &starget->devices); 989 list_add_tail(&sdev->siblings, &shost->__devices); 990 spin_unlock_irqrestore(shost->host_lock, flags); 991} 992 993int scsi_is_sdev_device(const struct device *dev) 994{ 995 return dev->type == &scsi_dev_type; 996} 997EXPORT_SYMBOL(scsi_is_sdev_device); 998 999/* A blank transport template that is used in drivers that don't 1000 * yet implement Transport Attributes */ 1001struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1002