scsi_sysfs.c revision 7eff2e7a8b65c25920207324e56611150eb1cd9a
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, struct kobj_uevent_env *env) 281{ 282 struct scsi_device *sdev = to_scsi_device(dev); 283 284 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 285 return 0; 286} 287 288static int scsi_bus_suspend(struct device * dev, pm_message_t state) 289{ 290 struct device_driver *drv = dev->driver; 291 struct scsi_device *sdev = to_scsi_device(dev); 292 int err; 293 294 err = scsi_device_quiesce(sdev); 295 if (err) 296 return err; 297 298 if (drv && drv->suspend) { 299 err = drv->suspend(dev, state); 300 if (err) 301 return err; 302 } 303 304 return 0; 305} 306 307static int scsi_bus_resume(struct device * dev) 308{ 309 struct device_driver *drv = dev->driver; 310 struct scsi_device *sdev = to_scsi_device(dev); 311 int err = 0; 312 313 if (drv && drv->resume) 314 err = drv->resume(dev); 315 316 scsi_device_resume(sdev); 317 318 return err; 319} 320 321struct bus_type scsi_bus_type = { 322 .name = "scsi", 323 .match = scsi_bus_match, 324 .uevent = scsi_bus_uevent, 325 .suspend = scsi_bus_suspend, 326 .resume = scsi_bus_resume, 327}; 328 329int scsi_sysfs_register(void) 330{ 331 int error; 332 333 error = bus_register(&scsi_bus_type); 334 if (!error) { 335 error = class_register(&sdev_class); 336 if (error) 337 bus_unregister(&scsi_bus_type); 338 } 339 340 return error; 341} 342 343void scsi_sysfs_unregister(void) 344{ 345 class_unregister(&sdev_class); 346 bus_unregister(&scsi_bus_type); 347} 348 349/* 350 * sdev_show_function: macro to create an attr function that can be used to 351 * show a non-bit field. 352 */ 353#define sdev_show_function(field, format_string) \ 354static ssize_t \ 355sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \ 356{ \ 357 struct scsi_device *sdev; \ 358 sdev = to_scsi_device(dev); \ 359 return snprintf (buf, 20, format_string, sdev->field); \ 360} \ 361 362/* 363 * sdev_rd_attr: macro to create a function and attribute variable for a 364 * read only field. 365 */ 366#define sdev_rd_attr(field, format_string) \ 367 sdev_show_function(field, format_string) \ 368static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 369 370 371/* 372 * sdev_rd_attr: create a function and attribute variable for a 373 * read/write field. 374 */ 375#define sdev_rw_attr(field, format_string) \ 376 sdev_show_function(field, format_string) \ 377 \ 378static ssize_t \ 379sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 380{ \ 381 struct scsi_device *sdev; \ 382 sdev = to_scsi_device(dev); \ 383 snscanf (buf, 20, format_string, &sdev->field); \ 384 return count; \ 385} \ 386static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 387 388/* Currently we don't export bit fields, but we might in future, 389 * so leave this code in */ 390#if 0 391/* 392 * sdev_rd_attr: create a function and attribute variable for a 393 * read/write bit field. 394 */ 395#define sdev_rw_attr_bit(field) \ 396 sdev_show_function(field, "%d\n") \ 397 \ 398static ssize_t \ 399sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 400{ \ 401 int ret; \ 402 struct scsi_device *sdev; \ 403 ret = scsi_sdev_check_buf_bit(buf); \ 404 if (ret >= 0) { \ 405 sdev = to_scsi_device(dev); \ 406 sdev->field = ret; \ 407 ret = count; \ 408 } \ 409 return ret; \ 410} \ 411static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 412 413/* 414 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 415 * else return -EINVAL. 416 */ 417static int scsi_sdev_check_buf_bit(const char *buf) 418{ 419 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 420 if (buf[0] == '1') 421 return 1; 422 else if (buf[0] == '0') 423 return 0; 424 else 425 return -EINVAL; 426 } else 427 return -EINVAL; 428} 429#endif 430/* 431 * Create the actual show/store functions and data structures. 432 */ 433sdev_rd_attr (device_blocked, "%d\n"); 434sdev_rd_attr (queue_depth, "%d\n"); 435sdev_rd_attr (type, "%d\n"); 436sdev_rd_attr (scsi_level, "%d\n"); 437sdev_rd_attr (vendor, "%.8s\n"); 438sdev_rd_attr (model, "%.16s\n"); 439sdev_rd_attr (rev, "%.4s\n"); 440 441static ssize_t 442sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 443{ 444 struct scsi_device *sdev; 445 sdev = to_scsi_device(dev); 446 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 447} 448 449static ssize_t 450sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 451{ 452 struct scsi_device *sdev; 453 int timeout; 454 sdev = to_scsi_device(dev); 455 sscanf (buf, "%d\n", &timeout); 456 sdev->timeout = timeout * HZ; 457 return count; 458} 459static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 460 461static ssize_t 462store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 463{ 464 scsi_rescan_device(dev); 465 return count; 466} 467static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 468 469static void sdev_store_delete_callback(struct device *dev) 470{ 471 scsi_remove_device(to_scsi_device(dev)); 472} 473 474static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 475 size_t count) 476{ 477 int rc; 478 479 /* An attribute cannot be unregistered by one of its own methods, 480 * so we have to use this roundabout approach. 481 */ 482 rc = device_schedule_callback(dev, sdev_store_delete_callback); 483 if (rc) 484 count = rc; 485 return count; 486}; 487static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 488 489static ssize_t 490store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 491{ 492 int i; 493 struct scsi_device *sdev = to_scsi_device(dev); 494 enum scsi_device_state state = 0; 495 496 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 497 const int len = strlen(sdev_states[i].name); 498 if (strncmp(sdev_states[i].name, buf, len) == 0 && 499 buf[len] == '\n') { 500 state = sdev_states[i].value; 501 break; 502 } 503 } 504 if (!state) 505 return -EINVAL; 506 507 if (scsi_device_set_state(sdev, state)) 508 return -EINVAL; 509 return count; 510} 511 512static ssize_t 513show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 514{ 515 struct scsi_device *sdev = to_scsi_device(dev); 516 const char *name = scsi_device_state_name(sdev->sdev_state); 517 518 if (!name) 519 return -EINVAL; 520 521 return snprintf(buf, 20, "%s\n", name); 522} 523 524static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 525 526static ssize_t 527show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf) 528{ 529 struct scsi_device *sdev = to_scsi_device(dev); 530 const char *name = "none"; 531 532 if (sdev->ordered_tags) 533 name = "ordered"; 534 else if (sdev->simple_tags) 535 name = "simple"; 536 537 return snprintf(buf, 20, "%s\n", name); 538} 539 540static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 541 542static ssize_t 543show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 544{ 545 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 546} 547 548static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 549 550#define show_sdev_iostat(field) \ 551static ssize_t \ 552show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \ 553{ \ 554 struct scsi_device *sdev = to_scsi_device(dev); \ 555 unsigned long long count = atomic_read(&sdev->field); \ 556 return snprintf(buf, 20, "0x%llx\n", count); \ 557} \ 558static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 559 560show_sdev_iostat(iorequest_cnt); 561show_sdev_iostat(iodone_cnt); 562show_sdev_iostat(ioerr_cnt); 563 564static ssize_t 565sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 566{ 567 struct scsi_device *sdev; 568 sdev = to_scsi_device(dev); 569 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 570} 571static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 572 573/* Default template for device attributes. May NOT be modified */ 574static struct device_attribute *scsi_sysfs_sdev_attrs[] = { 575 &dev_attr_device_blocked, 576 &dev_attr_queue_depth, 577 &dev_attr_queue_type, 578 &dev_attr_type, 579 &dev_attr_scsi_level, 580 &dev_attr_vendor, 581 &dev_attr_model, 582 &dev_attr_rev, 583 &dev_attr_rescan, 584 &dev_attr_delete, 585 &dev_attr_state, 586 &dev_attr_timeout, 587 &dev_attr_iocounterbits, 588 &dev_attr_iorequest_cnt, 589 &dev_attr_iodone_cnt, 590 &dev_attr_ioerr_cnt, 591 &dev_attr_modalias, 592 NULL 593}; 594 595static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf, 596 size_t count) 597{ 598 int depth, retval; 599 struct scsi_device *sdev = to_scsi_device(dev); 600 struct scsi_host_template *sht = sdev->host->hostt; 601 602 if (!sht->change_queue_depth) 603 return -EINVAL; 604 605 depth = simple_strtoul(buf, NULL, 0); 606 607 if (depth < 1) 608 return -EINVAL; 609 610 retval = sht->change_queue_depth(sdev, depth); 611 if (retval < 0) 612 return retval; 613 614 return count; 615} 616 617static struct device_attribute sdev_attr_queue_depth_rw = 618 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 619 sdev_store_queue_depth_rw); 620 621static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, 622 size_t count) 623{ 624 struct scsi_device *sdev = to_scsi_device(dev); 625 struct scsi_host_template *sht = sdev->host->hostt; 626 int tag_type = 0, retval; 627 int prev_tag_type = scsi_get_tag_type(sdev); 628 629 if (!sdev->tagged_supported || !sht->change_queue_type) 630 return -EINVAL; 631 632 if (strncmp(buf, "ordered", 7) == 0) 633 tag_type = MSG_ORDERED_TAG; 634 else if (strncmp(buf, "simple", 6) == 0) 635 tag_type = MSG_SIMPLE_TAG; 636 else if (strncmp(buf, "none", 4) != 0) 637 return -EINVAL; 638 639 if (tag_type == prev_tag_type) 640 return count; 641 642 retval = sht->change_queue_type(sdev, tag_type); 643 if (retval < 0) 644 return retval; 645 646 return count; 647} 648 649static struct device_attribute sdev_attr_queue_type_rw = 650 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 651 sdev_store_queue_type_rw); 652 653static struct device_attribute *attr_changed_internally( 654 struct Scsi_Host *shost, 655 struct device_attribute * attr) 656{ 657 if (!strcmp("queue_depth", attr->attr.name) 658 && shost->hostt->change_queue_depth) 659 return &sdev_attr_queue_depth_rw; 660 else if (!strcmp("queue_type", attr->attr.name) 661 && shost->hostt->change_queue_type) 662 return &sdev_attr_queue_type_rw; 663 return attr; 664} 665 666 667static struct device_attribute *attr_overridden( 668 struct device_attribute **attrs, 669 struct device_attribute *attr) 670{ 671 int i; 672 673 if (!attrs) 674 return NULL; 675 for (i = 0; attrs[i]; i++) 676 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 677 return attrs[i]; 678 return NULL; 679} 680 681static int attr_add(struct device *dev, struct device_attribute *attr) 682{ 683 struct device_attribute *base_attr; 684 685 /* 686 * Spare the caller from having to copy things it's not interested in. 687 */ 688 base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr); 689 if (base_attr) { 690 /* extend permissions */ 691 attr->attr.mode |= base_attr->attr.mode; 692 693 /* override null show/store with default */ 694 if (!attr->show) 695 attr->show = base_attr->show; 696 if (!attr->store) 697 attr->store = base_attr->store; 698 } 699 700 return device_create_file(dev, attr); 701} 702 703/** 704 * scsi_sysfs_add_sdev - add scsi device to sysfs 705 * @sdev: scsi_device to add 706 * 707 * Return value: 708 * 0 on Success / non-zero on Failure 709 **/ 710int scsi_sysfs_add_sdev(struct scsi_device *sdev) 711{ 712 int error, i; 713 struct request_queue *rq = sdev->request_queue; 714 715 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 716 return error; 717 718 error = device_add(&sdev->sdev_gendev); 719 if (error) { 720 put_device(sdev->sdev_gendev.parent); 721 printk(KERN_INFO "error 1\n"); 722 return error; 723 } 724 error = class_device_add(&sdev->sdev_classdev); 725 if (error) { 726 printk(KERN_INFO "error 2\n"); 727 goto clean_device; 728 } 729 730 /* take a reference for the sdev_classdev; this is 731 * released by the sdev_class .release */ 732 get_device(&sdev->sdev_gendev); 733 734 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL); 735 736 if (error) 737 sdev_printk(KERN_INFO, sdev, 738 "Failed to register bsg queue, errno=%d\n", error); 739 740 /* we're treating error on bsg register as non-fatal, so pretend 741 * nothing went wrong */ 742 error = 0; 743 744 if (sdev->host->hostt->sdev_attrs) { 745 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 746 error = attr_add(&sdev->sdev_gendev, 747 sdev->host->hostt->sdev_attrs[i]); 748 if (error) { 749 __scsi_remove_device(sdev); 750 goto out; 751 } 752 } 753 } 754 755 for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) { 756 if (!attr_overridden(sdev->host->hostt->sdev_attrs, 757 scsi_sysfs_sdev_attrs[i])) { 758 struct device_attribute * attr = 759 attr_changed_internally(sdev->host, 760 scsi_sysfs_sdev_attrs[i]); 761 error = device_create_file(&sdev->sdev_gendev, attr); 762 if (error) { 763 __scsi_remove_device(sdev); 764 goto out; 765 } 766 } 767 } 768 769 transport_add_device(&sdev->sdev_gendev); 770 out: 771 return error; 772 773 clean_device: 774 scsi_device_set_state(sdev, SDEV_CANCEL); 775 776 device_del(&sdev->sdev_gendev); 777 transport_destroy_device(&sdev->sdev_gendev); 778 put_device(&sdev->sdev_gendev); 779 780 return error; 781} 782 783void __scsi_remove_device(struct scsi_device *sdev) 784{ 785 struct device *dev = &sdev->sdev_gendev; 786 787 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 788 return; 789 790 bsg_unregister_queue(sdev->request_queue); 791 class_device_unregister(&sdev->sdev_classdev); 792 transport_remove_device(dev); 793 device_del(dev); 794 scsi_device_set_state(sdev, SDEV_DEL); 795 if (sdev->host->hostt->slave_destroy) 796 sdev->host->hostt->slave_destroy(sdev); 797 transport_destroy_device(dev); 798 put_device(dev); 799} 800 801/** 802 * scsi_remove_device - unregister a device from the scsi bus 803 * @sdev: scsi_device to unregister 804 **/ 805void scsi_remove_device(struct scsi_device *sdev) 806{ 807 struct Scsi_Host *shost = sdev->host; 808 809 mutex_lock(&shost->scan_mutex); 810 __scsi_remove_device(sdev); 811 mutex_unlock(&shost->scan_mutex); 812} 813EXPORT_SYMBOL(scsi_remove_device); 814 815static void __scsi_remove_target(struct scsi_target *starget) 816{ 817 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 818 unsigned long flags; 819 struct scsi_device *sdev; 820 821 spin_lock_irqsave(shost->host_lock, flags); 822 starget->reap_ref++; 823 restart: 824 list_for_each_entry(sdev, &shost->__devices, siblings) { 825 if (sdev->channel != starget->channel || 826 sdev->id != starget->id || 827 sdev->sdev_state == SDEV_DEL) 828 continue; 829 spin_unlock_irqrestore(shost->host_lock, flags); 830 scsi_remove_device(sdev); 831 spin_lock_irqsave(shost->host_lock, flags); 832 goto restart; 833 } 834 spin_unlock_irqrestore(shost->host_lock, flags); 835 scsi_target_reap(starget); 836} 837 838static int __remove_child (struct device * dev, void * data) 839{ 840 if (scsi_is_target_device(dev)) 841 __scsi_remove_target(to_scsi_target(dev)); 842 return 0; 843} 844 845/** 846 * scsi_remove_target - try to remove a target and all its devices 847 * @dev: generic starget or parent of generic stargets to be removed 848 * 849 * Note: This is slightly racy. It is possible that if the user 850 * requests the addition of another device then the target won't be 851 * removed. 852 */ 853void scsi_remove_target(struct device *dev) 854{ 855 struct device *rdev; 856 857 if (scsi_is_target_device(dev)) { 858 __scsi_remove_target(to_scsi_target(dev)); 859 return; 860 } 861 862 rdev = get_device(dev); 863 device_for_each_child(dev, NULL, __remove_child); 864 put_device(rdev); 865} 866EXPORT_SYMBOL(scsi_remove_target); 867 868int scsi_register_driver(struct device_driver *drv) 869{ 870 drv->bus = &scsi_bus_type; 871 872 return driver_register(drv); 873} 874EXPORT_SYMBOL(scsi_register_driver); 875 876int scsi_register_interface(struct class_interface *intf) 877{ 878 intf->class = &sdev_class; 879 880 return class_interface_register(intf); 881} 882EXPORT_SYMBOL(scsi_register_interface); 883 884 885static struct class_device_attribute *class_attr_overridden( 886 struct class_device_attribute **attrs, 887 struct class_device_attribute *attr) 888{ 889 int i; 890 891 if (!attrs) 892 return NULL; 893 for (i = 0; attrs[i]; i++) 894 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 895 return attrs[i]; 896 return NULL; 897} 898 899static int class_attr_add(struct class_device *classdev, 900 struct class_device_attribute *attr) 901{ 902 struct class_device_attribute *base_attr; 903 904 /* 905 * Spare the caller from having to copy things it's not interested in. 906 */ 907 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); 908 if (base_attr) { 909 /* extend permissions */ 910 attr->attr.mode |= base_attr->attr.mode; 911 912 /* override null show/store with default */ 913 if (!attr->show) 914 attr->show = base_attr->show; 915 if (!attr->store) 916 attr->store = base_attr->store; 917 } 918 919 return class_device_create_file(classdev, attr); 920} 921 922/** 923 * scsi_sysfs_add_host - add scsi host to subsystem 924 * @shost: scsi host struct to add to subsystem 925 * @dev: parent struct device pointer 926 **/ 927int scsi_sysfs_add_host(struct Scsi_Host *shost) 928{ 929 int error, i; 930 931 if (shost->hostt->shost_attrs) { 932 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 933 error = class_attr_add(&shost->shost_classdev, 934 shost->hostt->shost_attrs[i]); 935 if (error) 936 return error; 937 } 938 } 939 940 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { 941 if (!class_attr_overridden(shost->hostt->shost_attrs, 942 scsi_sysfs_shost_attrs[i])) { 943 error = class_device_create_file(&shost->shost_classdev, 944 scsi_sysfs_shost_attrs[i]); 945 if (error) 946 return error; 947 } 948 } 949 950 transport_register_device(&shost->shost_gendev); 951 return 0; 952} 953 954void scsi_sysfs_device_initialize(struct scsi_device *sdev) 955{ 956 unsigned long flags; 957 struct Scsi_Host *shost = sdev->host; 958 struct scsi_target *starget = sdev->sdev_target; 959 960 device_initialize(&sdev->sdev_gendev); 961 sdev->sdev_gendev.bus = &scsi_bus_type; 962 sdev->sdev_gendev.release = scsi_device_dev_release; 963 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 964 sdev->host->host_no, sdev->channel, sdev->id, 965 sdev->lun); 966 967 class_device_initialize(&sdev->sdev_classdev); 968 sdev->sdev_classdev.dev = &sdev->sdev_gendev; 969 sdev->sdev_classdev.class = &sdev_class; 970 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, 971 "%d:%d:%d:%d", sdev->host->host_no, 972 sdev->channel, sdev->id, sdev->lun); 973 sdev->scsi_level = starget->scsi_level; 974 transport_setup_device(&sdev->sdev_gendev); 975 spin_lock_irqsave(shost->host_lock, flags); 976 list_add_tail(&sdev->same_target_siblings, &starget->devices); 977 list_add_tail(&sdev->siblings, &shost->__devices); 978 spin_unlock_irqrestore(shost->host_lock, flags); 979} 980 981int scsi_is_sdev_device(const struct device *dev) 982{ 983 return dev->release == scsi_device_dev_release; 984} 985EXPORT_SYMBOL(scsi_is_sdev_device); 986 987/* A blank transport template that is used in drivers that don't 988 * yet implement Transport Attributes */ 989struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 990