scsi_sysfs.c revision 80ed71ce1a3369521c693ebf30abb9cfe1dc7e66
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 193shost_rd_attr(unique_id, "%u\n"); 194shost_rd_attr(host_busy, "%hu\n"); 195shost_rd_attr(cmd_per_lun, "%hd\n"); 196shost_rd_attr(can_queue, "%hd\n"); 197shost_rd_attr(sg_tablesize, "%hu\n"); 198shost_rd_attr(unchecked_isa_dma, "%d\n"); 199shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 200 201static struct class_device_attribute *scsi_sysfs_shost_attrs[] = { 202 &class_device_attr_unique_id, 203 &class_device_attr_host_busy, 204 &class_device_attr_cmd_per_lun, 205 &class_device_attr_can_queue, 206 &class_device_attr_sg_tablesize, 207 &class_device_attr_unchecked_isa_dma, 208 &class_device_attr_proc_name, 209 &class_device_attr_scan, 210 &class_device_attr_state, 211 NULL 212}; 213 214static void scsi_device_cls_release(struct class_device *class_dev) 215{ 216 struct scsi_device *sdev; 217 218 sdev = class_to_sdev(class_dev); 219 put_device(&sdev->sdev_gendev); 220} 221 222static void scsi_device_dev_release_usercontext(struct work_struct *work) 223{ 224 struct scsi_device *sdev; 225 struct device *parent; 226 struct scsi_target *starget; 227 unsigned long flags; 228 229 sdev = container_of(work, struct scsi_device, ew.work); 230 231 parent = sdev->sdev_gendev.parent; 232 starget = to_scsi_target(parent); 233 234 spin_lock_irqsave(sdev->host->host_lock, flags); 235 starget->reap_ref++; 236 list_del(&sdev->siblings); 237 list_del(&sdev->same_target_siblings); 238 list_del(&sdev->starved_entry); 239 spin_unlock_irqrestore(sdev->host->host_lock, flags); 240 241 if (sdev->request_queue) { 242 sdev->request_queue->queuedata = NULL; 243 /* user context needed to free queue */ 244 scsi_free_queue(sdev->request_queue); 245 /* temporary expedient, try to catch use of queue lock 246 * after free of sdev */ 247 sdev->request_queue = NULL; 248 } 249 250 scsi_target_reap(scsi_target(sdev)); 251 252 kfree(sdev->inquiry); 253 kfree(sdev); 254 255 if (parent) 256 put_device(parent); 257} 258 259static void scsi_device_dev_release(struct device *dev) 260{ 261 struct scsi_device *sdp = to_scsi_device(dev); 262 execute_in_process_context(scsi_device_dev_release_usercontext, 263 &sdp->ew); 264} 265 266static struct class sdev_class = { 267 .name = "scsi_device", 268 .release = scsi_device_cls_release, 269}; 270 271/* all probing is done in the individual ->probe routines */ 272static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 273{ 274 struct scsi_device *sdp = to_scsi_device(dev); 275 if (sdp->no_uld_attach) 276 return 0; 277 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 278} 279 280static int scsi_bus_uevent(struct device *dev, char **envp, int num_envp, 281 char *buffer, int buffer_size) 282{ 283 struct scsi_device *sdev = to_scsi_device(dev); 284 int i = 0; 285 int length = 0; 286 287 add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, 288 "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 289 envp[i] = NULL; 290 return 0; 291} 292 293static int scsi_bus_suspend(struct device * dev, pm_message_t state) 294{ 295 struct device_driver *drv = dev->driver; 296 struct scsi_device *sdev = to_scsi_device(dev); 297 int err; 298 299 err = scsi_device_quiesce(sdev); 300 if (err) 301 return err; 302 303 if (drv && drv->suspend) { 304 err = drv->suspend(dev, state); 305 if (err) 306 return err; 307 } 308 309 return 0; 310} 311 312static int scsi_bus_resume(struct device * dev) 313{ 314 struct device_driver *drv = dev->driver; 315 struct scsi_device *sdev = to_scsi_device(dev); 316 int err = 0; 317 318 if (drv && drv->resume) 319 err = drv->resume(dev); 320 321 scsi_device_resume(sdev); 322 323 return err; 324} 325 326struct bus_type scsi_bus_type = { 327 .name = "scsi", 328 .match = scsi_bus_match, 329 .uevent = scsi_bus_uevent, 330 .suspend = scsi_bus_suspend, 331 .resume = scsi_bus_resume, 332}; 333 334int scsi_sysfs_register(void) 335{ 336 int error; 337 338 error = bus_register(&scsi_bus_type); 339 if (!error) { 340 error = class_register(&sdev_class); 341 if (error) 342 bus_unregister(&scsi_bus_type); 343 } 344 345 return error; 346} 347 348void scsi_sysfs_unregister(void) 349{ 350 class_unregister(&sdev_class); 351 bus_unregister(&scsi_bus_type); 352} 353 354/* 355 * sdev_show_function: macro to create an attr function that can be used to 356 * show a non-bit field. 357 */ 358#define sdev_show_function(field, format_string) \ 359static ssize_t \ 360sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \ 361{ \ 362 struct scsi_device *sdev; \ 363 sdev = to_scsi_device(dev); \ 364 return snprintf (buf, 20, format_string, sdev->field); \ 365} \ 366 367/* 368 * sdev_rd_attr: macro to create a function and attribute variable for a 369 * read only field. 370 */ 371#define sdev_rd_attr(field, format_string) \ 372 sdev_show_function(field, format_string) \ 373static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 374 375 376/* 377 * sdev_rd_attr: create a function and attribute variable for a 378 * read/write field. 379 */ 380#define sdev_rw_attr(field, format_string) \ 381 sdev_show_function(field, format_string) \ 382 \ 383static ssize_t \ 384sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 385{ \ 386 struct scsi_device *sdev; \ 387 sdev = to_scsi_device(dev); \ 388 snscanf (buf, 20, format_string, &sdev->field); \ 389 return count; \ 390} \ 391static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 392 393/* Currently we don't export bit fields, but we might in future, 394 * so leave this code in */ 395#if 0 396/* 397 * sdev_rd_attr: create a function and attribute variable for a 398 * read/write bit field. 399 */ 400#define sdev_rw_attr_bit(field) \ 401 sdev_show_function(field, "%d\n") \ 402 \ 403static ssize_t \ 404sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 405{ \ 406 int ret; \ 407 struct scsi_device *sdev; \ 408 ret = scsi_sdev_check_buf_bit(buf); \ 409 if (ret >= 0) { \ 410 sdev = to_scsi_device(dev); \ 411 sdev->field = ret; \ 412 ret = count; \ 413 } \ 414 return ret; \ 415} \ 416static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 417 418/* 419 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 420 * else return -EINVAL. 421 */ 422static int scsi_sdev_check_buf_bit(const char *buf) 423{ 424 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 425 if (buf[0] == '1') 426 return 1; 427 else if (buf[0] == '0') 428 return 0; 429 else 430 return -EINVAL; 431 } else 432 return -EINVAL; 433} 434#endif 435/* 436 * Create the actual show/store functions and data structures. 437 */ 438sdev_rd_attr (device_blocked, "%d\n"); 439sdev_rd_attr (queue_depth, "%d\n"); 440sdev_rd_attr (type, "%d\n"); 441sdev_rd_attr (scsi_level, "%d\n"); 442sdev_rd_attr (vendor, "%.8s\n"); 443sdev_rd_attr (model, "%.16s\n"); 444sdev_rd_attr (rev, "%.4s\n"); 445 446static ssize_t 447sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 448{ 449 struct scsi_device *sdev; 450 sdev = to_scsi_device(dev); 451 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 452} 453 454static ssize_t 455sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 456{ 457 struct scsi_device *sdev; 458 int timeout; 459 sdev = to_scsi_device(dev); 460 sscanf (buf, "%d\n", &timeout); 461 sdev->timeout = timeout * HZ; 462 return count; 463} 464static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 465 466static ssize_t 467store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 468{ 469 scsi_rescan_device(dev); 470 return count; 471} 472static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 473 474static void sdev_store_delete_callback(struct device *dev) 475{ 476 scsi_remove_device(to_scsi_device(dev)); 477} 478 479static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 480 size_t count) 481{ 482 int rc; 483 484 /* An attribute cannot be unregistered by one of its own methods, 485 * so we have to use this roundabout approach. 486 */ 487 rc = device_schedule_callback(dev, sdev_store_delete_callback); 488 if (rc) 489 count = rc; 490 return count; 491}; 492static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 493 494static ssize_t 495store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 496{ 497 int i; 498 struct scsi_device *sdev = to_scsi_device(dev); 499 enum scsi_device_state state = 0; 500 501 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 502 const int len = strlen(sdev_states[i].name); 503 if (strncmp(sdev_states[i].name, buf, len) == 0 && 504 buf[len] == '\n') { 505 state = sdev_states[i].value; 506 break; 507 } 508 } 509 if (!state) 510 return -EINVAL; 511 512 if (scsi_device_set_state(sdev, state)) 513 return -EINVAL; 514 return count; 515} 516 517static ssize_t 518show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 519{ 520 struct scsi_device *sdev = to_scsi_device(dev); 521 const char *name = scsi_device_state_name(sdev->sdev_state); 522 523 if (!name) 524 return -EINVAL; 525 526 return snprintf(buf, 20, "%s\n", name); 527} 528 529static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 530 531static ssize_t 532show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf) 533{ 534 struct scsi_device *sdev = to_scsi_device(dev); 535 const char *name = "none"; 536 537 if (sdev->ordered_tags) 538 name = "ordered"; 539 else if (sdev->simple_tags) 540 name = "simple"; 541 542 return snprintf(buf, 20, "%s\n", name); 543} 544 545static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 546 547static ssize_t 548show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 549{ 550 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 551} 552 553static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 554 555#define show_sdev_iostat(field) \ 556static ssize_t \ 557show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \ 558{ \ 559 struct scsi_device *sdev = to_scsi_device(dev); \ 560 unsigned long long count = atomic_read(&sdev->field); \ 561 return snprintf(buf, 20, "0x%llx\n", count); \ 562} \ 563static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 564 565show_sdev_iostat(iorequest_cnt); 566show_sdev_iostat(iodone_cnt); 567show_sdev_iostat(ioerr_cnt); 568 569static ssize_t 570sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 571{ 572 struct scsi_device *sdev; 573 sdev = to_scsi_device(dev); 574 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 575} 576static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 577 578/* Default template for device attributes. May NOT be modified */ 579static struct device_attribute *scsi_sysfs_sdev_attrs[] = { 580 &dev_attr_device_blocked, 581 &dev_attr_queue_depth, 582 &dev_attr_queue_type, 583 &dev_attr_type, 584 &dev_attr_scsi_level, 585 &dev_attr_vendor, 586 &dev_attr_model, 587 &dev_attr_rev, 588 &dev_attr_rescan, 589 &dev_attr_delete, 590 &dev_attr_state, 591 &dev_attr_timeout, 592 &dev_attr_iocounterbits, 593 &dev_attr_iorequest_cnt, 594 &dev_attr_iodone_cnt, 595 &dev_attr_ioerr_cnt, 596 &dev_attr_modalias, 597 NULL 598}; 599 600static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf, 601 size_t count) 602{ 603 int depth, retval; 604 struct scsi_device *sdev = to_scsi_device(dev); 605 struct scsi_host_template *sht = sdev->host->hostt; 606 607 if (!sht->change_queue_depth) 608 return -EINVAL; 609 610 depth = simple_strtoul(buf, NULL, 0); 611 612 if (depth < 1) 613 return -EINVAL; 614 615 retval = sht->change_queue_depth(sdev, depth); 616 if (retval < 0) 617 return retval; 618 619 return count; 620} 621 622static struct device_attribute sdev_attr_queue_depth_rw = 623 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 624 sdev_store_queue_depth_rw); 625 626static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, 627 size_t count) 628{ 629 struct scsi_device *sdev = to_scsi_device(dev); 630 struct scsi_host_template *sht = sdev->host->hostt; 631 int tag_type = 0, retval; 632 int prev_tag_type = scsi_get_tag_type(sdev); 633 634 if (!sdev->tagged_supported || !sht->change_queue_type) 635 return -EINVAL; 636 637 if (strncmp(buf, "ordered", 7) == 0) 638 tag_type = MSG_ORDERED_TAG; 639 else if (strncmp(buf, "simple", 6) == 0) 640 tag_type = MSG_SIMPLE_TAG; 641 else if (strncmp(buf, "none", 4) != 0) 642 return -EINVAL; 643 644 if (tag_type == prev_tag_type) 645 return count; 646 647 retval = sht->change_queue_type(sdev, tag_type); 648 if (retval < 0) 649 return retval; 650 651 return count; 652} 653 654static struct device_attribute sdev_attr_queue_type_rw = 655 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 656 sdev_store_queue_type_rw); 657 658static struct device_attribute *attr_changed_internally( 659 struct Scsi_Host *shost, 660 struct device_attribute * attr) 661{ 662 if (!strcmp("queue_depth", attr->attr.name) 663 && shost->hostt->change_queue_depth) 664 return &sdev_attr_queue_depth_rw; 665 else if (!strcmp("queue_type", attr->attr.name) 666 && shost->hostt->change_queue_type) 667 return &sdev_attr_queue_type_rw; 668 return attr; 669} 670 671 672static struct device_attribute *attr_overridden( 673 struct device_attribute **attrs, 674 struct device_attribute *attr) 675{ 676 int i; 677 678 if (!attrs) 679 return NULL; 680 for (i = 0; attrs[i]; i++) 681 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 682 return attrs[i]; 683 return NULL; 684} 685 686static int attr_add(struct device *dev, struct device_attribute *attr) 687{ 688 struct device_attribute *base_attr; 689 690 /* 691 * Spare the caller from having to copy things it's not interested in. 692 */ 693 base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr); 694 if (base_attr) { 695 /* extend permissions */ 696 attr->attr.mode |= base_attr->attr.mode; 697 698 /* override null show/store with default */ 699 if (!attr->show) 700 attr->show = base_attr->show; 701 if (!attr->store) 702 attr->store = base_attr->store; 703 } 704 705 return device_create_file(dev, attr); 706} 707 708/** 709 * scsi_sysfs_add_sdev - add scsi device to sysfs 710 * @sdev: scsi_device to add 711 * 712 * Return value: 713 * 0 on Success / non-zero on Failure 714 **/ 715int scsi_sysfs_add_sdev(struct scsi_device *sdev) 716{ 717 int error, i; 718 struct request_queue *rq = sdev->request_queue; 719 720 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 721 return error; 722 723 error = device_add(&sdev->sdev_gendev); 724 if (error) { 725 put_device(sdev->sdev_gendev.parent); 726 printk(KERN_INFO "error 1\n"); 727 return error; 728 } 729 error = class_device_add(&sdev->sdev_classdev); 730 if (error) { 731 printk(KERN_INFO "error 2\n"); 732 goto clean_device; 733 } 734 735 /* take a reference for the sdev_classdev; this is 736 * released by the sdev_class .release */ 737 get_device(&sdev->sdev_gendev); 738 739 error = bsg_register_queue(rq, sdev->sdev_gendev.bus_id); 740 741 if (error) 742 sdev_printk(KERN_INFO, sdev, 743 "Failed to register bsg queue, errno=%d\n", error); 744 745 /* we're treating error on bsg register as non-fatal, so pretend 746 * nothing went wrong */ 747 error = 0; 748 749 if (sdev->host->hostt->sdev_attrs) { 750 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 751 error = attr_add(&sdev->sdev_gendev, 752 sdev->host->hostt->sdev_attrs[i]); 753 if (error) { 754 __scsi_remove_device(sdev); 755 goto out; 756 } 757 } 758 } 759 760 for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) { 761 if (!attr_overridden(sdev->host->hostt->sdev_attrs, 762 scsi_sysfs_sdev_attrs[i])) { 763 struct device_attribute * attr = 764 attr_changed_internally(sdev->host, 765 scsi_sysfs_sdev_attrs[i]); 766 error = device_create_file(&sdev->sdev_gendev, attr); 767 if (error) { 768 __scsi_remove_device(sdev); 769 goto out; 770 } 771 } 772 } 773 774 transport_add_device(&sdev->sdev_gendev); 775 out: 776 return error; 777 778 clean_device: 779 scsi_device_set_state(sdev, SDEV_CANCEL); 780 781 device_del(&sdev->sdev_gendev); 782 transport_destroy_device(&sdev->sdev_gendev); 783 put_device(&sdev->sdev_gendev); 784 785 return error; 786} 787 788void __scsi_remove_device(struct scsi_device *sdev) 789{ 790 struct device *dev = &sdev->sdev_gendev; 791 792 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 793 return; 794 795 bsg_unregister_queue(sdev->request_queue); 796 class_device_unregister(&sdev->sdev_classdev); 797 transport_remove_device(dev); 798 device_del(dev); 799 scsi_device_set_state(sdev, SDEV_DEL); 800 if (sdev->host->hostt->slave_destroy) 801 sdev->host->hostt->slave_destroy(sdev); 802 transport_destroy_device(dev); 803 put_device(dev); 804} 805 806/** 807 * scsi_remove_device - unregister a device from the scsi bus 808 * @sdev: scsi_device to unregister 809 **/ 810void scsi_remove_device(struct scsi_device *sdev) 811{ 812 struct Scsi_Host *shost = sdev->host; 813 814 mutex_lock(&shost->scan_mutex); 815 __scsi_remove_device(sdev); 816 mutex_unlock(&shost->scan_mutex); 817} 818EXPORT_SYMBOL(scsi_remove_device); 819 820static void __scsi_remove_target(struct scsi_target *starget) 821{ 822 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 823 unsigned long flags; 824 struct scsi_device *sdev; 825 826 spin_lock_irqsave(shost->host_lock, flags); 827 starget->reap_ref++; 828 restart: 829 list_for_each_entry(sdev, &shost->__devices, siblings) { 830 if (sdev->channel != starget->channel || 831 sdev->id != starget->id || 832 sdev->sdev_state == SDEV_DEL) 833 continue; 834 spin_unlock_irqrestore(shost->host_lock, flags); 835 scsi_remove_device(sdev); 836 spin_lock_irqsave(shost->host_lock, flags); 837 goto restart; 838 } 839 spin_unlock_irqrestore(shost->host_lock, flags); 840 scsi_target_reap(starget); 841} 842 843static int __remove_child (struct device * dev, void * data) 844{ 845 if (scsi_is_target_device(dev)) 846 __scsi_remove_target(to_scsi_target(dev)); 847 return 0; 848} 849 850/** 851 * scsi_remove_target - try to remove a target and all its devices 852 * @dev: generic starget or parent of generic stargets to be removed 853 * 854 * Note: This is slightly racy. It is possible that if the user 855 * requests the addition of another device then the target won't be 856 * removed. 857 */ 858void scsi_remove_target(struct device *dev) 859{ 860 struct device *rdev; 861 862 if (scsi_is_target_device(dev)) { 863 __scsi_remove_target(to_scsi_target(dev)); 864 return; 865 } 866 867 rdev = get_device(dev); 868 device_for_each_child(dev, NULL, __remove_child); 869 put_device(rdev); 870} 871EXPORT_SYMBOL(scsi_remove_target); 872 873int scsi_register_driver(struct device_driver *drv) 874{ 875 drv->bus = &scsi_bus_type; 876 877 return driver_register(drv); 878} 879EXPORT_SYMBOL(scsi_register_driver); 880 881int scsi_register_interface(struct class_interface *intf) 882{ 883 intf->class = &sdev_class; 884 885 return class_interface_register(intf); 886} 887EXPORT_SYMBOL(scsi_register_interface); 888 889 890static struct class_device_attribute *class_attr_overridden( 891 struct class_device_attribute **attrs, 892 struct class_device_attribute *attr) 893{ 894 int i; 895 896 if (!attrs) 897 return NULL; 898 for (i = 0; attrs[i]; i++) 899 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 900 return attrs[i]; 901 return NULL; 902} 903 904static int class_attr_add(struct class_device *classdev, 905 struct class_device_attribute *attr) 906{ 907 struct class_device_attribute *base_attr; 908 909 /* 910 * Spare the caller from having to copy things it's not interested in. 911 */ 912 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); 913 if (base_attr) { 914 /* extend permissions */ 915 attr->attr.mode |= base_attr->attr.mode; 916 917 /* override null show/store with default */ 918 if (!attr->show) 919 attr->show = base_attr->show; 920 if (!attr->store) 921 attr->store = base_attr->store; 922 } 923 924 return class_device_create_file(classdev, attr); 925} 926 927/** 928 * scsi_sysfs_add_host - add scsi host to subsystem 929 * @shost: scsi host struct to add to subsystem 930 * @dev: parent struct device pointer 931 **/ 932int scsi_sysfs_add_host(struct Scsi_Host *shost) 933{ 934 int error, i; 935 936 if (shost->hostt->shost_attrs) { 937 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 938 error = class_attr_add(&shost->shost_classdev, 939 shost->hostt->shost_attrs[i]); 940 if (error) 941 return error; 942 } 943 } 944 945 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { 946 if (!class_attr_overridden(shost->hostt->shost_attrs, 947 scsi_sysfs_shost_attrs[i])) { 948 error = class_device_create_file(&shost->shost_classdev, 949 scsi_sysfs_shost_attrs[i]); 950 if (error) 951 return error; 952 } 953 } 954 955 transport_register_device(&shost->shost_gendev); 956 return 0; 957} 958 959void scsi_sysfs_device_initialize(struct scsi_device *sdev) 960{ 961 unsigned long flags; 962 struct Scsi_Host *shost = sdev->host; 963 struct scsi_target *starget = sdev->sdev_target; 964 965 device_initialize(&sdev->sdev_gendev); 966 sdev->sdev_gendev.bus = &scsi_bus_type; 967 sdev->sdev_gendev.release = scsi_device_dev_release; 968 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 969 sdev->host->host_no, sdev->channel, sdev->id, 970 sdev->lun); 971 972 class_device_initialize(&sdev->sdev_classdev); 973 sdev->sdev_classdev.dev = &sdev->sdev_gendev; 974 sdev->sdev_classdev.class = &sdev_class; 975 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, 976 "%d:%d:%d:%d", sdev->host->host_no, 977 sdev->channel, sdev->id, sdev->lun); 978 sdev->scsi_level = starget->scsi_level; 979 transport_setup_device(&sdev->sdev_gendev); 980 spin_lock_irqsave(shost->host_lock, flags); 981 list_add_tail(&sdev->same_target_siblings, &starget->devices); 982 list_add_tail(&sdev->siblings, &shost->__devices); 983 spin_unlock_irqrestore(shost->host_lock, flags); 984} 985 986int scsi_is_sdev_device(const struct device *dev) 987{ 988 return dev->release == scsi_device_dev_release; 989} 990EXPORT_SYMBOL(scsi_is_sdev_device); 991 992/* A blank transport template that is used in drivers that don't 993 * yet implement Transport Attributes */ 994struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 995