scsi_sysfs.c revision c3c94c5a2fb43a654e777f509d5032b0db8ed09f
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 20#include "scsi_priv.h" 21#include "scsi_logging.h" 22 23static const struct { 24 enum scsi_device_state value; 25 char *name; 26} sdev_states[] = { 27 { SDEV_CREATED, "created" }, 28 { SDEV_RUNNING, "running" }, 29 { SDEV_CANCEL, "cancel" }, 30 { SDEV_DEL, "deleted" }, 31 { SDEV_QUIESCE, "quiesce" }, 32 { SDEV_OFFLINE, "offline" }, 33 { SDEV_BLOCK, "blocked" }, 34}; 35 36const char *scsi_device_state_name(enum scsi_device_state state) 37{ 38 int i; 39 char *name = NULL; 40 41 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 42 if (sdev_states[i].value == state) { 43 name = sdev_states[i].name; 44 break; 45 } 46 } 47 return name; 48} 49 50static const struct { 51 enum scsi_host_state value; 52 char *name; 53} shost_states[] = { 54 { SHOST_CREATED, "created" }, 55 { SHOST_RUNNING, "running" }, 56 { SHOST_CANCEL, "cancel" }, 57 { SHOST_DEL, "deleted" }, 58 { SHOST_RECOVERY, "recovery" }, 59 { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, 60 { SHOST_DEL_RECOVERY, "deleted/recovery", }, 61}; 62const char *scsi_host_state_name(enum scsi_host_state state) 63{ 64 int i; 65 char *name = NULL; 66 67 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 68 if (shost_states[i].value == state) { 69 name = shost_states[i].name; 70 break; 71 } 72 } 73 return name; 74} 75 76static int check_set(unsigned int *val, char *src) 77{ 78 char *last; 79 80 if (strncmp(src, "-", 20) == 0) { 81 *val = SCAN_WILD_CARD; 82 } else { 83 /* 84 * Doesn't check for int overflow 85 */ 86 *val = simple_strtoul(src, &last, 0); 87 if (*last != '\0') 88 return 1; 89 } 90 return 0; 91} 92 93static int scsi_scan(struct Scsi_Host *shost, const char *str) 94{ 95 char s1[15], s2[15], s3[15], junk; 96 unsigned int channel, id, lun; 97 int res; 98 99 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk); 100 if (res != 3) 101 return -EINVAL; 102 if (check_set(&channel, s1)) 103 return -EINVAL; 104 if (check_set(&id, s2)) 105 return -EINVAL; 106 if (check_set(&lun, s3)) 107 return -EINVAL; 108 if (shost->transportt->user_scan) 109 res = shost->transportt->user_scan(shost, channel, id, lun); 110 else 111 res = scsi_scan_host_selected(shost, channel, id, lun, 1); 112 return res; 113} 114 115/* 116 * shost_show_function: macro to create an attr function that can be used to 117 * show a non-bit field. 118 */ 119#define shost_show_function(name, field, format_string) \ 120static ssize_t \ 121show_##name (struct class_device *class_dev, char *buf) \ 122{ \ 123 struct Scsi_Host *shost = class_to_shost(class_dev); \ 124 return snprintf (buf, 20, format_string, shost->field); \ 125} 126 127/* 128 * shost_rd_attr: macro to create a function and attribute variable for a 129 * read only field. 130 */ 131#define shost_rd_attr2(name, field, format_string) \ 132 shost_show_function(name, field, format_string) \ 133static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 134 135#define shost_rd_attr(field, format_string) \ 136shost_rd_attr2(field, field, format_string) 137 138/* 139 * Create the actual show/store functions and data structures. 140 */ 141 142static ssize_t store_scan(struct class_device *class_dev, const char *buf, 143 size_t count) 144{ 145 struct Scsi_Host *shost = class_to_shost(class_dev); 146 int res; 147 148 res = scsi_scan(shost, buf); 149 if (res == 0) 150 res = count; 151 return res; 152}; 153static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); 154 155static ssize_t 156store_shost_state(struct class_device *class_dev, const char *buf, size_t count) 157{ 158 int i; 159 struct Scsi_Host *shost = class_to_shost(class_dev); 160 enum scsi_host_state state = 0; 161 162 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 163 const int len = strlen(shost_states[i].name); 164 if (strncmp(shost_states[i].name, buf, len) == 0 && 165 buf[len] == '\n') { 166 state = shost_states[i].value; 167 break; 168 } 169 } 170 if (!state) 171 return -EINVAL; 172 173 if (scsi_host_set_state(shost, state)) 174 return -EINVAL; 175 return count; 176} 177 178static ssize_t 179show_shost_state(struct class_device *class_dev, char *buf) 180{ 181 struct Scsi_Host *shost = class_to_shost(class_dev); 182 const char *name = scsi_host_state_name(shost->shost_state); 183 184 if (!name) 185 return -EINVAL; 186 187 return snprintf(buf, 20, "%s\n", name); 188} 189 190static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); 191 192shost_rd_attr(unique_id, "%u\n"); 193shost_rd_attr(host_busy, "%hu\n"); 194shost_rd_attr(cmd_per_lun, "%hd\n"); 195shost_rd_attr(can_queue, "%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_can_queue, 205 &class_device_attr_sg_tablesize, 206 &class_device_attr_unchecked_isa_dma, 207 &class_device_attr_proc_name, 208 &class_device_attr_scan, 209 &class_device_attr_state, 210 NULL 211}; 212 213static void scsi_device_cls_release(struct class_device *class_dev) 214{ 215 struct scsi_device *sdev; 216 217 sdev = class_to_sdev(class_dev); 218 put_device(&sdev->sdev_gendev); 219} 220 221static void scsi_device_dev_release_usercontext(struct work_struct *work) 222{ 223 struct scsi_device *sdev; 224 struct device *parent; 225 struct scsi_target *starget; 226 unsigned long flags; 227 228 sdev = container_of(work, struct scsi_device, ew.work); 229 230 parent = sdev->sdev_gendev.parent; 231 starget = to_scsi_target(parent); 232 233 spin_lock_irqsave(sdev->host->host_lock, flags); 234 starget->reap_ref++; 235 list_del(&sdev->siblings); 236 list_del(&sdev->same_target_siblings); 237 list_del(&sdev->starved_entry); 238 spin_unlock_irqrestore(sdev->host->host_lock, flags); 239 240 if (sdev->request_queue) { 241 sdev->request_queue->queuedata = NULL; 242 /* user context needed to free queue */ 243 scsi_free_queue(sdev->request_queue); 244 /* temporary expedient, try to catch use of queue lock 245 * after free of sdev */ 246 sdev->request_queue = NULL; 247 } 248 249 scsi_target_reap(scsi_target(sdev)); 250 251 kfree(sdev->inquiry); 252 kfree(sdev); 253 254 if (parent) 255 put_device(parent); 256} 257 258static void scsi_device_dev_release(struct device *dev) 259{ 260 struct scsi_device *sdp = to_scsi_device(dev); 261 execute_in_process_context(scsi_device_dev_release_usercontext, 262 &sdp->ew); 263} 264 265static struct class sdev_class = { 266 .name = "scsi_device", 267 .release = scsi_device_cls_release, 268}; 269 270/* all probing is done in the individual ->probe routines */ 271static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 272{ 273 struct scsi_device *sdp = to_scsi_device(dev); 274 if (sdp->no_uld_attach) 275 return 0; 276 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 277} 278 279static int scsi_bus_suspend(struct device * dev, pm_message_t state) 280{ 281 struct device_driver *drv = dev->driver; 282 struct scsi_device *sdev = to_scsi_device(dev); 283 struct scsi_host_template *sht = sdev->host->hostt; 284 int err; 285 286 err = scsi_device_quiesce(sdev); 287 if (err) 288 return err; 289 290 /* call HLD suspend first */ 291 if (drv && drv->suspend) { 292 err = drv->suspend(dev, state); 293 if (err) 294 return err; 295 } 296 297 /* then, call host suspend */ 298 if (sht->suspend) { 299 err = sht->suspend(sdev, state); 300 if (err) { 301 if (drv && drv->resume) 302 drv->resume(dev); 303 return err; 304 } 305 } 306 307 return 0; 308} 309 310static int scsi_bus_resume(struct device * dev) 311{ 312 struct device_driver *drv = dev->driver; 313 struct scsi_device *sdev = to_scsi_device(dev); 314 struct scsi_host_template *sht = sdev->host->hostt; 315 int err = 0, err2 = 0; 316 317 /* call host resume first */ 318 if (sht->resume) 319 err = sht->resume(sdev); 320 321 /* then, call HLD resume */ 322 if (drv && drv->resume) 323 err2 = drv->resume(dev); 324 325 scsi_device_resume(sdev); 326 327 /* favor LLD failure */ 328 return err ? err : err2;; 329} 330 331struct bus_type scsi_bus_type = { 332 .name = "scsi", 333 .match = scsi_bus_match, 334 .suspend = scsi_bus_suspend, 335 .resume = scsi_bus_resume, 336}; 337 338int scsi_sysfs_register(void) 339{ 340 int error; 341 342 error = bus_register(&scsi_bus_type); 343 if (!error) { 344 error = class_register(&sdev_class); 345 if (error) 346 bus_unregister(&scsi_bus_type); 347 } 348 349 return error; 350} 351 352void scsi_sysfs_unregister(void) 353{ 354 class_unregister(&sdev_class); 355 bus_unregister(&scsi_bus_type); 356} 357 358/* 359 * sdev_show_function: macro to create an attr function that can be used to 360 * show a non-bit field. 361 */ 362#define sdev_show_function(field, format_string) \ 363static ssize_t \ 364sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \ 365{ \ 366 struct scsi_device *sdev; \ 367 sdev = to_scsi_device(dev); \ 368 return snprintf (buf, 20, format_string, sdev->field); \ 369} \ 370 371/* 372 * sdev_rd_attr: macro to create a function and attribute variable for a 373 * read only field. 374 */ 375#define sdev_rd_attr(field, format_string) \ 376 sdev_show_function(field, format_string) \ 377static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 378 379 380/* 381 * sdev_rd_attr: create a function and attribute variable for a 382 * read/write field. 383 */ 384#define sdev_rw_attr(field, format_string) \ 385 sdev_show_function(field, format_string) \ 386 \ 387static ssize_t \ 388sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 389{ \ 390 struct scsi_device *sdev; \ 391 sdev = to_scsi_device(dev); \ 392 snscanf (buf, 20, format_string, &sdev->field); \ 393 return count; \ 394} \ 395static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 396 397/* Currently we don't export bit fields, but we might in future, 398 * so leave this code in */ 399#if 0 400/* 401 * sdev_rd_attr: create a function and attribute variable for a 402 * read/write bit field. 403 */ 404#define sdev_rw_attr_bit(field) \ 405 sdev_show_function(field, "%d\n") \ 406 \ 407static ssize_t \ 408sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 409{ \ 410 int ret; \ 411 struct scsi_device *sdev; \ 412 ret = scsi_sdev_check_buf_bit(buf); \ 413 if (ret >= 0) { \ 414 sdev = to_scsi_device(dev); \ 415 sdev->field = ret; \ 416 ret = count; \ 417 } \ 418 return ret; \ 419} \ 420static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 421 422/* 423 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 424 * else return -EINVAL. 425 */ 426static int scsi_sdev_check_buf_bit(const char *buf) 427{ 428 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 429 if (buf[0] == '1') 430 return 1; 431 else if (buf[0] == '0') 432 return 0; 433 else 434 return -EINVAL; 435 } else 436 return -EINVAL; 437} 438#endif 439/* 440 * Create the actual show/store functions and data structures. 441 */ 442sdev_rd_attr (device_blocked, "%d\n"); 443sdev_rd_attr (queue_depth, "%d\n"); 444sdev_rd_attr (type, "%d\n"); 445sdev_rd_attr (scsi_level, "%d\n"); 446sdev_rd_attr (vendor, "%.8s\n"); 447sdev_rd_attr (model, "%.16s\n"); 448sdev_rd_attr (rev, "%.4s\n"); 449 450static ssize_t 451sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 452{ 453 struct scsi_device *sdev; 454 sdev = to_scsi_device(dev); 455 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 456} 457 458static ssize_t 459sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 460{ 461 struct scsi_device *sdev; 462 int timeout; 463 sdev = to_scsi_device(dev); 464 sscanf (buf, "%d\n", &timeout); 465 sdev->timeout = timeout * HZ; 466 return count; 467} 468static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 469 470static ssize_t 471store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 472{ 473 scsi_rescan_device(dev); 474 return count; 475} 476static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 477 478static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 479 size_t count) 480{ 481 scsi_remove_device(to_scsi_device(dev)); 482 return count; 483}; 484static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 485 486static ssize_t 487store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 488{ 489 int i; 490 struct scsi_device *sdev = to_scsi_device(dev); 491 enum scsi_device_state state = 0; 492 493 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 494 const int len = strlen(sdev_states[i].name); 495 if (strncmp(sdev_states[i].name, buf, len) == 0 && 496 buf[len] == '\n') { 497 state = sdev_states[i].value; 498 break; 499 } 500 } 501 if (!state) 502 return -EINVAL; 503 504 if (scsi_device_set_state(sdev, state)) 505 return -EINVAL; 506 return count; 507} 508 509static ssize_t 510show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 511{ 512 struct scsi_device *sdev = to_scsi_device(dev); 513 const char *name = scsi_device_state_name(sdev->sdev_state); 514 515 if (!name) 516 return -EINVAL; 517 518 return snprintf(buf, 20, "%s\n", name); 519} 520 521static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 522 523static ssize_t 524show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf) 525{ 526 struct scsi_device *sdev = to_scsi_device(dev); 527 const char *name = "none"; 528 529 if (sdev->ordered_tags) 530 name = "ordered"; 531 else if (sdev->simple_tags) 532 name = "simple"; 533 534 return snprintf(buf, 20, "%s\n", name); 535} 536 537static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 538 539static ssize_t 540show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 541{ 542 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 543} 544 545static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 546 547#define show_sdev_iostat(field) \ 548static ssize_t \ 549show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \ 550{ \ 551 struct scsi_device *sdev = to_scsi_device(dev); \ 552 unsigned long long count = atomic_read(&sdev->field); \ 553 return snprintf(buf, 20, "0x%llx\n", count); \ 554} \ 555static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 556 557show_sdev_iostat(iorequest_cnt); 558show_sdev_iostat(iodone_cnt); 559show_sdev_iostat(ioerr_cnt); 560 561 562/* Default template for device attributes. May NOT be modified */ 563static struct device_attribute *scsi_sysfs_sdev_attrs[] = { 564 &dev_attr_device_blocked, 565 &dev_attr_queue_depth, 566 &dev_attr_queue_type, 567 &dev_attr_type, 568 &dev_attr_scsi_level, 569 &dev_attr_vendor, 570 &dev_attr_model, 571 &dev_attr_rev, 572 &dev_attr_rescan, 573 &dev_attr_delete, 574 &dev_attr_state, 575 &dev_attr_timeout, 576 &dev_attr_iocounterbits, 577 &dev_attr_iorequest_cnt, 578 &dev_attr_iodone_cnt, 579 &dev_attr_ioerr_cnt, 580 NULL 581}; 582 583static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf, 584 size_t count) 585{ 586 int depth, retval; 587 struct scsi_device *sdev = to_scsi_device(dev); 588 struct scsi_host_template *sht = sdev->host->hostt; 589 590 if (!sht->change_queue_depth) 591 return -EINVAL; 592 593 depth = simple_strtoul(buf, NULL, 0); 594 595 if (depth < 1) 596 return -EINVAL; 597 598 retval = sht->change_queue_depth(sdev, depth); 599 if (retval < 0) 600 return retval; 601 602 return count; 603} 604 605static struct device_attribute sdev_attr_queue_depth_rw = 606 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 607 sdev_store_queue_depth_rw); 608 609static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, 610 size_t count) 611{ 612 struct scsi_device *sdev = to_scsi_device(dev); 613 struct scsi_host_template *sht = sdev->host->hostt; 614 int tag_type = 0, retval; 615 int prev_tag_type = scsi_get_tag_type(sdev); 616 617 if (!sdev->tagged_supported || !sht->change_queue_type) 618 return -EINVAL; 619 620 if (strncmp(buf, "ordered", 7) == 0) 621 tag_type = MSG_ORDERED_TAG; 622 else if (strncmp(buf, "simple", 6) == 0) 623 tag_type = MSG_SIMPLE_TAG; 624 else if (strncmp(buf, "none", 4) != 0) 625 return -EINVAL; 626 627 if (tag_type == prev_tag_type) 628 return count; 629 630 retval = sht->change_queue_type(sdev, tag_type); 631 if (retval < 0) 632 return retval; 633 634 return count; 635} 636 637static struct device_attribute sdev_attr_queue_type_rw = 638 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 639 sdev_store_queue_type_rw); 640 641static struct device_attribute *attr_changed_internally( 642 struct Scsi_Host *shost, 643 struct device_attribute * attr) 644{ 645 if (!strcmp("queue_depth", attr->attr.name) 646 && shost->hostt->change_queue_depth) 647 return &sdev_attr_queue_depth_rw; 648 else if (!strcmp("queue_type", attr->attr.name) 649 && shost->hostt->change_queue_type) 650 return &sdev_attr_queue_type_rw; 651 return attr; 652} 653 654 655static struct device_attribute *attr_overridden( 656 struct device_attribute **attrs, 657 struct device_attribute *attr) 658{ 659 int i; 660 661 if (!attrs) 662 return NULL; 663 for (i = 0; attrs[i]; i++) 664 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 665 return attrs[i]; 666 return NULL; 667} 668 669static int attr_add(struct device *dev, struct device_attribute *attr) 670{ 671 struct device_attribute *base_attr; 672 673 /* 674 * Spare the caller from having to copy things it's not interested in. 675 */ 676 base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr); 677 if (base_attr) { 678 /* extend permissions */ 679 attr->attr.mode |= base_attr->attr.mode; 680 681 /* override null show/store with default */ 682 if (!attr->show) 683 attr->show = base_attr->show; 684 if (!attr->store) 685 attr->store = base_attr->store; 686 } 687 688 return device_create_file(dev, attr); 689} 690 691/** 692 * scsi_sysfs_add_sdev - add scsi device to sysfs 693 * @sdev: scsi_device to add 694 * 695 * Return value: 696 * 0 on Success / non-zero on Failure 697 **/ 698int scsi_sysfs_add_sdev(struct scsi_device *sdev) 699{ 700 int error, i; 701 702 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 703 return error; 704 705 error = device_add(&sdev->sdev_gendev); 706 if (error) { 707 put_device(sdev->sdev_gendev.parent); 708 printk(KERN_INFO "error 1\n"); 709 return error; 710 } 711 error = class_device_add(&sdev->sdev_classdev); 712 if (error) { 713 printk(KERN_INFO "error 2\n"); 714 goto clean_device; 715 } 716 717 /* take a reference for the sdev_classdev; this is 718 * released by the sdev_class .release */ 719 get_device(&sdev->sdev_gendev); 720 if (sdev->host->hostt->sdev_attrs) { 721 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 722 error = attr_add(&sdev->sdev_gendev, 723 sdev->host->hostt->sdev_attrs[i]); 724 if (error) { 725 __scsi_remove_device(sdev); 726 goto out; 727 } 728 } 729 } 730 731 for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) { 732 if (!attr_overridden(sdev->host->hostt->sdev_attrs, 733 scsi_sysfs_sdev_attrs[i])) { 734 struct device_attribute * attr = 735 attr_changed_internally(sdev->host, 736 scsi_sysfs_sdev_attrs[i]); 737 error = device_create_file(&sdev->sdev_gendev, attr); 738 if (error) { 739 __scsi_remove_device(sdev); 740 goto out; 741 } 742 } 743 } 744 745 transport_add_device(&sdev->sdev_gendev); 746 out: 747 return error; 748 749 clean_device: 750 scsi_device_set_state(sdev, SDEV_CANCEL); 751 752 device_del(&sdev->sdev_gendev); 753 transport_destroy_device(&sdev->sdev_gendev); 754 put_device(&sdev->sdev_gendev); 755 756 return error; 757} 758 759void __scsi_remove_device(struct scsi_device *sdev) 760{ 761 struct device *dev = &sdev->sdev_gendev; 762 763 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 764 return; 765 766 class_device_unregister(&sdev->sdev_classdev); 767 transport_remove_device(dev); 768 device_del(dev); 769 scsi_device_set_state(sdev, SDEV_DEL); 770 if (sdev->host->hostt->slave_destroy) 771 sdev->host->hostt->slave_destroy(sdev); 772 transport_destroy_device(dev); 773 put_device(dev); 774} 775 776/** 777 * scsi_remove_device - unregister a device from the scsi bus 778 * @sdev: scsi_device to unregister 779 **/ 780void scsi_remove_device(struct scsi_device *sdev) 781{ 782 struct Scsi_Host *shost = sdev->host; 783 784 mutex_lock(&shost->scan_mutex); 785 __scsi_remove_device(sdev); 786 mutex_unlock(&shost->scan_mutex); 787} 788EXPORT_SYMBOL(scsi_remove_device); 789 790void __scsi_remove_target(struct scsi_target *starget) 791{ 792 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 793 unsigned long flags; 794 struct scsi_device *sdev; 795 796 spin_lock_irqsave(shost->host_lock, flags); 797 starget->reap_ref++; 798 restart: 799 list_for_each_entry(sdev, &shost->__devices, siblings) { 800 if (sdev->channel != starget->channel || 801 sdev->id != starget->id || 802 sdev->sdev_state == SDEV_DEL) 803 continue; 804 spin_unlock_irqrestore(shost->host_lock, flags); 805 scsi_remove_device(sdev); 806 spin_lock_irqsave(shost->host_lock, flags); 807 goto restart; 808 } 809 spin_unlock_irqrestore(shost->host_lock, flags); 810 scsi_target_reap(starget); 811} 812 813static int __remove_child (struct device * dev, void * data) 814{ 815 if (scsi_is_target_device(dev)) 816 __scsi_remove_target(to_scsi_target(dev)); 817 return 0; 818} 819 820/** 821 * scsi_remove_target - try to remove a target and all its devices 822 * @dev: generic starget or parent of generic stargets to be removed 823 * 824 * Note: This is slightly racy. It is possible that if the user 825 * requests the addition of another device then the target won't be 826 * removed. 827 */ 828void scsi_remove_target(struct device *dev) 829{ 830 struct device *rdev; 831 832 if (scsi_is_target_device(dev)) { 833 __scsi_remove_target(to_scsi_target(dev)); 834 return; 835 } 836 837 rdev = get_device(dev); 838 device_for_each_child(dev, NULL, __remove_child); 839 put_device(rdev); 840} 841EXPORT_SYMBOL(scsi_remove_target); 842 843int scsi_register_driver(struct device_driver *drv) 844{ 845 drv->bus = &scsi_bus_type; 846 847 return driver_register(drv); 848} 849EXPORT_SYMBOL(scsi_register_driver); 850 851int scsi_register_interface(struct class_interface *intf) 852{ 853 intf->class = &sdev_class; 854 855 return class_interface_register(intf); 856} 857EXPORT_SYMBOL(scsi_register_interface); 858 859 860static struct class_device_attribute *class_attr_overridden( 861 struct class_device_attribute **attrs, 862 struct class_device_attribute *attr) 863{ 864 int i; 865 866 if (!attrs) 867 return NULL; 868 for (i = 0; attrs[i]; i++) 869 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 870 return attrs[i]; 871 return NULL; 872} 873 874static int class_attr_add(struct class_device *classdev, 875 struct class_device_attribute *attr) 876{ 877 struct class_device_attribute *base_attr; 878 879 /* 880 * Spare the caller from having to copy things it's not interested in. 881 */ 882 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); 883 if (base_attr) { 884 /* extend permissions */ 885 attr->attr.mode |= base_attr->attr.mode; 886 887 /* override null show/store with default */ 888 if (!attr->show) 889 attr->show = base_attr->show; 890 if (!attr->store) 891 attr->store = base_attr->store; 892 } 893 894 return class_device_create_file(classdev, attr); 895} 896 897/** 898 * scsi_sysfs_add_host - add scsi host to subsystem 899 * @shost: scsi host struct to add to subsystem 900 * @dev: parent struct device pointer 901 **/ 902int scsi_sysfs_add_host(struct Scsi_Host *shost) 903{ 904 int error, i; 905 906 if (shost->hostt->shost_attrs) { 907 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 908 error = class_attr_add(&shost->shost_classdev, 909 shost->hostt->shost_attrs[i]); 910 if (error) 911 return error; 912 } 913 } 914 915 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { 916 if (!class_attr_overridden(shost->hostt->shost_attrs, 917 scsi_sysfs_shost_attrs[i])) { 918 error = class_device_create_file(&shost->shost_classdev, 919 scsi_sysfs_shost_attrs[i]); 920 if (error) 921 return error; 922 } 923 } 924 925 transport_register_device(&shost->shost_gendev); 926 return 0; 927} 928 929void scsi_sysfs_device_initialize(struct scsi_device *sdev) 930{ 931 unsigned long flags; 932 struct Scsi_Host *shost = sdev->host; 933 struct scsi_target *starget = sdev->sdev_target; 934 935 device_initialize(&sdev->sdev_gendev); 936 sdev->sdev_gendev.bus = &scsi_bus_type; 937 sdev->sdev_gendev.release = scsi_device_dev_release; 938 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 939 sdev->host->host_no, sdev->channel, sdev->id, 940 sdev->lun); 941 942 class_device_initialize(&sdev->sdev_classdev); 943 sdev->sdev_classdev.dev = &sdev->sdev_gendev; 944 sdev->sdev_classdev.class = &sdev_class; 945 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, 946 "%d:%d:%d:%d", sdev->host->host_no, 947 sdev->channel, sdev->id, sdev->lun); 948 sdev->scsi_level = starget->scsi_level; 949 transport_setup_device(&sdev->sdev_gendev); 950 spin_lock_irqsave(shost->host_lock, flags); 951 list_add_tail(&sdev->same_target_siblings, &starget->devices); 952 list_add_tail(&sdev->siblings, &shost->__devices); 953 spin_unlock_irqrestore(shost->host_lock, flags); 954} 955 956int scsi_is_sdev_device(const struct device *dev) 957{ 958 return dev->release == scsi_device_dev_release; 959} 960EXPORT_SYMBOL(scsi_is_sdev_device); 961 962/* A blank transport template that is used in drivers that don't 963 * yet implement Transport Attributes */ 964struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 965