scsi_sysfs.c revision e02f3f59225d8c3b2a0ad0dc941a09865e27da61
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/config.h> 10#include <linux/module.h> 11#include <linux/init.h> 12#include <linux/blkdev.h> 13#include <linux/device.h> 14 15#include <scsi/scsi.h> 16#include <scsi/scsi_device.h> 17#include <scsi/scsi_host.h> 18#include <scsi/scsi_tcq.h> 19#include <scsi/scsi_transport.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 < sizeof(sdev_states)/sizeof(sdev_states[0]); 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 < sizeof(shost_states)/sizeof(shost_states[0]); 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 < sizeof(shost_states)/sizeof(shost_states[0]); 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(sg_tablesize, "%hu\n"); 197shost_rd_attr(unchecked_isa_dma, "%d\n"); 198shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 199 200static struct class_device_attribute *scsi_sysfs_shost_attrs[] = { 201 &class_device_attr_unique_id, 202 &class_device_attr_host_busy, 203 &class_device_attr_cmd_per_lun, 204 &class_device_attr_sg_tablesize, 205 &class_device_attr_unchecked_isa_dma, 206 &class_device_attr_proc_name, 207 &class_device_attr_scan, 208 &class_device_attr_state, 209 NULL 210}; 211 212static void scsi_device_cls_release(struct class_device *class_dev) 213{ 214 struct scsi_device *sdev; 215 216 sdev = class_to_sdev(class_dev); 217 put_device(&sdev->sdev_gendev); 218} 219 220static void scsi_device_dev_release(struct device *dev) 221{ 222 struct scsi_device *sdev; 223 struct device *parent; 224 struct scsi_target *starget; 225 unsigned long flags; 226 227 parent = dev->parent; 228 sdev = to_scsi_device(dev); 229 starget = to_scsi_target(parent); 230 231 spin_lock_irqsave(sdev->host->host_lock, flags); 232 starget->reap_ref++; 233 list_del(&sdev->siblings); 234 list_del(&sdev->same_target_siblings); 235 list_del(&sdev->starved_entry); 236 spin_unlock_irqrestore(sdev->host->host_lock, flags); 237 238 if (sdev->request_queue) { 239 sdev->request_queue->queuedata = NULL; 240 scsi_free_queue(sdev->request_queue); 241 /* temporary expedient, try to catch use of queue lock 242 * after free of sdev */ 243 sdev->request_queue = NULL; 244 } 245 246 scsi_target_reap(scsi_target(sdev)); 247 248 kfree(sdev->inquiry); 249 kfree(sdev); 250 251 if (parent) 252 put_device(parent); 253} 254 255static struct class sdev_class = { 256 .name = "scsi_device", 257 .release = scsi_device_cls_release, 258}; 259 260/* all probing is done in the individual ->probe routines */ 261static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 262{ 263 struct scsi_device *sdp = to_scsi_device(dev); 264 if (sdp->no_uld_attach) 265 return 0; 266 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 267} 268 269static int scsi_bus_suspend(struct device * dev, pm_message_t state) 270{ 271 struct scsi_device *sdev = to_scsi_device(dev); 272 struct scsi_host_template *sht = sdev->host->hostt; 273 int err; 274 275 err = scsi_device_quiesce(sdev); 276 if (err) 277 return err; 278 279 if (sht->suspend) 280 err = sht->suspend(sdev); 281 282 return err; 283} 284 285static int scsi_bus_resume(struct device * dev) 286{ 287 struct scsi_device *sdev = to_scsi_device(dev); 288 struct scsi_host_template *sht = sdev->host->hostt; 289 int err = 0; 290 291 if (sht->resume) 292 err = sht->resume(sdev); 293 294 scsi_device_resume(sdev); 295 return err; 296} 297 298struct bus_type scsi_bus_type = { 299 .name = "scsi", 300 .match = scsi_bus_match, 301 .suspend = scsi_bus_suspend, 302 .resume = scsi_bus_resume, 303}; 304 305int scsi_sysfs_register(void) 306{ 307 int error; 308 309 error = bus_register(&scsi_bus_type); 310 if (!error) { 311 error = class_register(&sdev_class); 312 if (error) 313 bus_unregister(&scsi_bus_type); 314 } 315 316 return error; 317} 318 319void scsi_sysfs_unregister(void) 320{ 321 class_unregister(&sdev_class); 322 bus_unregister(&scsi_bus_type); 323} 324 325/* 326 * sdev_show_function: macro to create an attr function that can be used to 327 * show a non-bit field. 328 */ 329#define sdev_show_function(field, format_string) \ 330static ssize_t \ 331sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \ 332{ \ 333 struct scsi_device *sdev; \ 334 sdev = to_scsi_device(dev); \ 335 return snprintf (buf, 20, format_string, sdev->field); \ 336} \ 337 338/* 339 * sdev_rd_attr: macro to create a function and attribute variable for a 340 * read only field. 341 */ 342#define sdev_rd_attr(field, format_string) \ 343 sdev_show_function(field, format_string) \ 344static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 345 346 347/* 348 * sdev_rd_attr: create a function and attribute variable for a 349 * read/write field. 350 */ 351#define sdev_rw_attr(field, format_string) \ 352 sdev_show_function(field, format_string) \ 353 \ 354static ssize_t \ 355sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 356{ \ 357 struct scsi_device *sdev; \ 358 sdev = to_scsi_device(dev); \ 359 snscanf (buf, 20, format_string, &sdev->field); \ 360 return count; \ 361} \ 362static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 363 364/* Currently we don't export bit fields, but we might in future, 365 * so leave this code in */ 366#if 0 367/* 368 * sdev_rd_attr: create a function and attribute variable for a 369 * read/write bit field. 370 */ 371#define sdev_rw_attr_bit(field) \ 372 sdev_show_function(field, "%d\n") \ 373 \ 374static ssize_t \ 375sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 376{ \ 377 int ret; \ 378 struct scsi_device *sdev; \ 379 ret = scsi_sdev_check_buf_bit(buf); \ 380 if (ret >= 0) { \ 381 sdev = to_scsi_device(dev); \ 382 sdev->field = ret; \ 383 ret = count; \ 384 } \ 385 return ret; \ 386} \ 387static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 388 389/* 390 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 391 * else return -EINVAL. 392 */ 393static int scsi_sdev_check_buf_bit(const char *buf) 394{ 395 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 396 if (buf[0] == '1') 397 return 1; 398 else if (buf[0] == '0') 399 return 0; 400 else 401 return -EINVAL; 402 } else 403 return -EINVAL; 404} 405#endif 406/* 407 * Create the actual show/store functions and data structures. 408 */ 409sdev_rd_attr (device_blocked, "%d\n"); 410sdev_rd_attr (queue_depth, "%d\n"); 411sdev_rd_attr (type, "%d\n"); 412sdev_rd_attr (scsi_level, "%d\n"); 413sdev_rd_attr (vendor, "%.8s\n"); 414sdev_rd_attr (model, "%.16s\n"); 415sdev_rd_attr (rev, "%.4s\n"); 416 417static ssize_t 418sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 419{ 420 struct scsi_device *sdev; 421 sdev = to_scsi_device(dev); 422 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 423} 424 425static ssize_t 426sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 427{ 428 struct scsi_device *sdev; 429 int timeout; 430 sdev = to_scsi_device(dev); 431 sscanf (buf, "%d\n", &timeout); 432 sdev->timeout = timeout * HZ; 433 return count; 434} 435static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 436 437static ssize_t 438store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 439{ 440 scsi_rescan_device(dev); 441 return count; 442} 443static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 444 445static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 446 size_t count) 447{ 448 scsi_remove_device(to_scsi_device(dev)); 449 return count; 450}; 451static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 452 453static ssize_t 454store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 455{ 456 int i; 457 struct scsi_device *sdev = to_scsi_device(dev); 458 enum scsi_device_state state = 0; 459 460 for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); i++) { 461 const int len = strlen(sdev_states[i].name); 462 if (strncmp(sdev_states[i].name, buf, len) == 0 && 463 buf[len] == '\n') { 464 state = sdev_states[i].value; 465 break; 466 } 467 } 468 if (!state) 469 return -EINVAL; 470 471 if (scsi_device_set_state(sdev, state)) 472 return -EINVAL; 473 return count; 474} 475 476static ssize_t 477show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 478{ 479 struct scsi_device *sdev = to_scsi_device(dev); 480 const char *name = scsi_device_state_name(sdev->sdev_state); 481 482 if (!name) 483 return -EINVAL; 484 485 return snprintf(buf, 20, "%s\n", name); 486} 487 488static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 489 490static ssize_t 491show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf) 492{ 493 struct scsi_device *sdev = to_scsi_device(dev); 494 const char *name = "none"; 495 496 if (sdev->ordered_tags) 497 name = "ordered"; 498 else if (sdev->simple_tags) 499 name = "simple"; 500 501 return snprintf(buf, 20, "%s\n", name); 502} 503 504static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 505 506static ssize_t 507show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 508{ 509 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 510} 511 512static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 513 514#define show_sdev_iostat(field) \ 515static ssize_t \ 516show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \ 517{ \ 518 struct scsi_device *sdev = to_scsi_device(dev); \ 519 unsigned long long count = atomic_read(&sdev->field); \ 520 return snprintf(buf, 20, "0x%llx\n", count); \ 521} \ 522static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 523 524show_sdev_iostat(iorequest_cnt); 525show_sdev_iostat(iodone_cnt); 526show_sdev_iostat(ioerr_cnt); 527 528 529/* Default template for device attributes. May NOT be modified */ 530static struct device_attribute *scsi_sysfs_sdev_attrs[] = { 531 &dev_attr_device_blocked, 532 &dev_attr_queue_depth, 533 &dev_attr_queue_type, 534 &dev_attr_type, 535 &dev_attr_scsi_level, 536 &dev_attr_vendor, 537 &dev_attr_model, 538 &dev_attr_rev, 539 &dev_attr_rescan, 540 &dev_attr_delete, 541 &dev_attr_state, 542 &dev_attr_timeout, 543 &dev_attr_iocounterbits, 544 &dev_attr_iorequest_cnt, 545 &dev_attr_iodone_cnt, 546 &dev_attr_ioerr_cnt, 547 NULL 548}; 549 550static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf, 551 size_t count) 552{ 553 int depth, retval; 554 struct scsi_device *sdev = to_scsi_device(dev); 555 struct scsi_host_template *sht = sdev->host->hostt; 556 557 if (!sht->change_queue_depth) 558 return -EINVAL; 559 560 depth = simple_strtoul(buf, NULL, 0); 561 562 if (depth < 1) 563 return -EINVAL; 564 565 retval = sht->change_queue_depth(sdev, depth); 566 if (retval < 0) 567 return retval; 568 569 return count; 570} 571 572static struct device_attribute sdev_attr_queue_depth_rw = 573 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 574 sdev_store_queue_depth_rw); 575 576static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, 577 size_t count) 578{ 579 struct scsi_device *sdev = to_scsi_device(dev); 580 struct scsi_host_template *sht = sdev->host->hostt; 581 int tag_type = 0, retval; 582 int prev_tag_type = scsi_get_tag_type(sdev); 583 584 if (!sdev->tagged_supported || !sht->change_queue_type) 585 return -EINVAL; 586 587 if (strncmp(buf, "ordered", 7) == 0) 588 tag_type = MSG_ORDERED_TAG; 589 else if (strncmp(buf, "simple", 6) == 0) 590 tag_type = MSG_SIMPLE_TAG; 591 else if (strncmp(buf, "none", 4) != 0) 592 return -EINVAL; 593 594 if (tag_type == prev_tag_type) 595 return count; 596 597 retval = sht->change_queue_type(sdev, tag_type); 598 if (retval < 0) 599 return retval; 600 601 return count; 602} 603 604static struct device_attribute sdev_attr_queue_type_rw = 605 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 606 sdev_store_queue_type_rw); 607 608static struct device_attribute *attr_changed_internally( 609 struct Scsi_Host *shost, 610 struct device_attribute * attr) 611{ 612 if (!strcmp("queue_depth", attr->attr.name) 613 && shost->hostt->change_queue_depth) 614 return &sdev_attr_queue_depth_rw; 615 else if (!strcmp("queue_type", attr->attr.name) 616 && shost->hostt->change_queue_type) 617 return &sdev_attr_queue_type_rw; 618 return attr; 619} 620 621 622static struct device_attribute *attr_overridden( 623 struct device_attribute **attrs, 624 struct device_attribute *attr) 625{ 626 int i; 627 628 if (!attrs) 629 return NULL; 630 for (i = 0; attrs[i]; i++) 631 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 632 return attrs[i]; 633 return NULL; 634} 635 636static int attr_add(struct device *dev, struct device_attribute *attr) 637{ 638 struct device_attribute *base_attr; 639 640 /* 641 * Spare the caller from having to copy things it's not interested in. 642 */ 643 base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr); 644 if (base_attr) { 645 /* extend permissions */ 646 attr->attr.mode |= base_attr->attr.mode; 647 648 /* override null show/store with default */ 649 if (!attr->show) 650 attr->show = base_attr->show; 651 if (!attr->store) 652 attr->store = base_attr->store; 653 } 654 655 return device_create_file(dev, attr); 656} 657 658/** 659 * scsi_sysfs_add_sdev - add scsi device to sysfs 660 * @sdev: scsi_device to add 661 * 662 * Return value: 663 * 0 on Success / non-zero on Failure 664 **/ 665int scsi_sysfs_add_sdev(struct scsi_device *sdev) 666{ 667 int error, i; 668 669 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 670 return error; 671 672 error = device_add(&sdev->sdev_gendev); 673 if (error) { 674 put_device(sdev->sdev_gendev.parent); 675 printk(KERN_INFO "error 1\n"); 676 return error; 677 } 678 error = class_device_add(&sdev->sdev_classdev); 679 if (error) { 680 printk(KERN_INFO "error 2\n"); 681 goto clean_device; 682 } 683 684 /* take a reference for the sdev_classdev; this is 685 * released by the sdev_class .release */ 686 get_device(&sdev->sdev_gendev); 687 if (sdev->host->hostt->sdev_attrs) { 688 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 689 error = attr_add(&sdev->sdev_gendev, 690 sdev->host->hostt->sdev_attrs[i]); 691 if (error) { 692 __scsi_remove_device(sdev); 693 goto out; 694 } 695 } 696 } 697 698 for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) { 699 if (!attr_overridden(sdev->host->hostt->sdev_attrs, 700 scsi_sysfs_sdev_attrs[i])) { 701 struct device_attribute * attr = 702 attr_changed_internally(sdev->host, 703 scsi_sysfs_sdev_attrs[i]); 704 error = device_create_file(&sdev->sdev_gendev, attr); 705 if (error) { 706 __scsi_remove_device(sdev); 707 goto out; 708 } 709 } 710 } 711 712 transport_add_device(&sdev->sdev_gendev); 713 out: 714 return error; 715 716 clean_device: 717 scsi_device_set_state(sdev, SDEV_CANCEL); 718 719 device_del(&sdev->sdev_gendev); 720 transport_destroy_device(&sdev->sdev_gendev); 721 put_device(&sdev->sdev_gendev); 722 723 return error; 724} 725 726void __scsi_remove_device(struct scsi_device *sdev) 727{ 728 struct device *dev = &sdev->sdev_gendev; 729 730 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 731 return; 732 733 class_device_unregister(&sdev->sdev_classdev); 734 transport_remove_device(dev); 735 device_del(dev); 736 scsi_device_set_state(sdev, SDEV_DEL); 737 if (sdev->host->hostt->slave_destroy) 738 sdev->host->hostt->slave_destroy(sdev); 739 transport_destroy_device(dev); 740 put_device(dev); 741} 742 743/** 744 * scsi_remove_device - unregister a device from the scsi bus 745 * @sdev: scsi_device to unregister 746 **/ 747void scsi_remove_device(struct scsi_device *sdev) 748{ 749 struct Scsi_Host *shost = sdev->host; 750 751 mutex_lock(&shost->scan_mutex); 752 __scsi_remove_device(sdev); 753 mutex_unlock(&shost->scan_mutex); 754} 755EXPORT_SYMBOL(scsi_remove_device); 756 757void __scsi_remove_target(struct scsi_target *starget) 758{ 759 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 760 unsigned long flags; 761 struct scsi_device *sdev; 762 763 spin_lock_irqsave(shost->host_lock, flags); 764 starget->reap_ref++; 765 restart: 766 list_for_each_entry(sdev, &shost->__devices, siblings) { 767 if (sdev->channel != starget->channel || 768 sdev->id != starget->id || 769 sdev->sdev_state == SDEV_DEL) 770 continue; 771 spin_unlock_irqrestore(shost->host_lock, flags); 772 scsi_remove_device(sdev); 773 spin_lock_irqsave(shost->host_lock, flags); 774 goto restart; 775 } 776 spin_unlock_irqrestore(shost->host_lock, flags); 777 scsi_target_reap(starget); 778} 779 780static int __remove_child (struct device * dev, void * data) 781{ 782 if (scsi_is_target_device(dev)) 783 __scsi_remove_target(to_scsi_target(dev)); 784 return 0; 785} 786 787/** 788 * scsi_remove_target - try to remove a target and all its devices 789 * @dev: generic starget or parent of generic stargets to be removed 790 * 791 * Note: This is slightly racy. It is possible that if the user 792 * requests the addition of another device then the target won't be 793 * removed. 794 */ 795void scsi_remove_target(struct device *dev) 796{ 797 struct device *rdev; 798 799 if (scsi_is_target_device(dev)) { 800 __scsi_remove_target(to_scsi_target(dev)); 801 return; 802 } 803 804 rdev = get_device(dev); 805 device_for_each_child(dev, NULL, __remove_child); 806 put_device(rdev); 807} 808EXPORT_SYMBOL(scsi_remove_target); 809 810int scsi_register_driver(struct device_driver *drv) 811{ 812 drv->bus = &scsi_bus_type; 813 814 return driver_register(drv); 815} 816EXPORT_SYMBOL(scsi_register_driver); 817 818int scsi_register_interface(struct class_interface *intf) 819{ 820 intf->class = &sdev_class; 821 822 return class_interface_register(intf); 823} 824EXPORT_SYMBOL(scsi_register_interface); 825 826 827static struct class_device_attribute *class_attr_overridden( 828 struct class_device_attribute **attrs, 829 struct class_device_attribute *attr) 830{ 831 int i; 832 833 if (!attrs) 834 return NULL; 835 for (i = 0; attrs[i]; i++) 836 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 837 return attrs[i]; 838 return NULL; 839} 840 841static int class_attr_add(struct class_device *classdev, 842 struct class_device_attribute *attr) 843{ 844 struct class_device_attribute *base_attr; 845 846 /* 847 * Spare the caller from having to copy things it's not interested in. 848 */ 849 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); 850 if (base_attr) { 851 /* extend permissions */ 852 attr->attr.mode |= base_attr->attr.mode; 853 854 /* override null show/store with default */ 855 if (!attr->show) 856 attr->show = base_attr->show; 857 if (!attr->store) 858 attr->store = base_attr->store; 859 } 860 861 return class_device_create_file(classdev, attr); 862} 863 864/** 865 * scsi_sysfs_add_host - add scsi host to subsystem 866 * @shost: scsi host struct to add to subsystem 867 * @dev: parent struct device pointer 868 **/ 869int scsi_sysfs_add_host(struct Scsi_Host *shost) 870{ 871 int error, i; 872 873 if (shost->hostt->shost_attrs) { 874 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 875 error = class_attr_add(&shost->shost_classdev, 876 shost->hostt->shost_attrs[i]); 877 if (error) 878 return error; 879 } 880 } 881 882 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { 883 if (!class_attr_overridden(shost->hostt->shost_attrs, 884 scsi_sysfs_shost_attrs[i])) { 885 error = class_device_create_file(&shost->shost_classdev, 886 scsi_sysfs_shost_attrs[i]); 887 if (error) 888 return error; 889 } 890 } 891 892 transport_register_device(&shost->shost_gendev); 893 return 0; 894} 895 896void scsi_sysfs_device_initialize(struct scsi_device *sdev) 897{ 898 unsigned long flags; 899 struct Scsi_Host *shost = sdev->host; 900 struct scsi_target *starget = sdev->sdev_target; 901 902 device_initialize(&sdev->sdev_gendev); 903 sdev->sdev_gendev.bus = &scsi_bus_type; 904 sdev->sdev_gendev.release = scsi_device_dev_release; 905 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 906 sdev->host->host_no, sdev->channel, sdev->id, 907 sdev->lun); 908 909 class_device_initialize(&sdev->sdev_classdev); 910 sdev->sdev_classdev.dev = &sdev->sdev_gendev; 911 sdev->sdev_classdev.class = &sdev_class; 912 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, 913 "%d:%d:%d:%d", sdev->host->host_no, 914 sdev->channel, sdev->id, sdev->lun); 915 sdev->scsi_level = SCSI_2; 916 transport_setup_device(&sdev->sdev_gendev); 917 spin_lock_irqsave(shost->host_lock, flags); 918 list_add_tail(&sdev->same_target_siblings, &starget->devices); 919 list_add_tail(&sdev->siblings, &shost->__devices); 920 spin_unlock_irqrestore(shost->host_lock, flags); 921} 922 923int scsi_is_sdev_device(const struct device *dev) 924{ 925 return dev->release == scsi_device_dev_release; 926} 927EXPORT_SYMBOL(scsi_is_sdev_device); 928 929/* A blank transport template that is used in drivers that don't 930 * yet implement Transport Attributes */ 931struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 932