scsi_sysfs.c revision 4f7a307dc6e4d8bfeb56f7cf7231b08cb845687c
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_uevent(struct device *dev, char **envp, int num_envp, 280 char *buffer, int buffer_size) 281{ 282 struct scsi_device *sdev = to_scsi_device(dev); 283 int i = 0; 284 int length = 0; 285 286 add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, 287 "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 288 envp[i] = NULL; 289 return 0; 290} 291 292static int scsi_bus_suspend(struct device * dev, pm_message_t state) 293{ 294 struct device_driver *drv = dev->driver; 295 struct scsi_device *sdev = to_scsi_device(dev); 296 struct scsi_host_template *sht = sdev->host->hostt; 297 int err; 298 299 err = scsi_device_quiesce(sdev); 300 if (err) 301 return err; 302 303 /* call HLD suspend first */ 304 if (drv && drv->suspend) { 305 err = drv->suspend(dev, state); 306 if (err) 307 return err; 308 } 309 310 /* then, call host suspend */ 311 if (sht->suspend) { 312 err = sht->suspend(sdev, state); 313 if (err) { 314 if (drv && drv->resume) 315 drv->resume(dev); 316 return err; 317 } 318 } 319 320 return 0; 321} 322 323static int scsi_bus_resume(struct device * dev) 324{ 325 struct device_driver *drv = dev->driver; 326 struct scsi_device *sdev = to_scsi_device(dev); 327 struct scsi_host_template *sht = sdev->host->hostt; 328 int err = 0, err2 = 0; 329 330 /* call host resume first */ 331 if (sht->resume) 332 err = sht->resume(sdev); 333 334 /* then, call HLD resume */ 335 if (drv && drv->resume) 336 err2 = drv->resume(dev); 337 338 scsi_device_resume(sdev); 339 340 /* favor LLD failure */ 341 return err ? err : err2;; 342} 343 344struct bus_type scsi_bus_type = { 345 .name = "scsi", 346 .match = scsi_bus_match, 347 .uevent = scsi_bus_uevent, 348 .suspend = scsi_bus_suspend, 349 .resume = scsi_bus_resume, 350}; 351 352int scsi_sysfs_register(void) 353{ 354 int error; 355 356 error = bus_register(&scsi_bus_type); 357 if (!error) { 358 error = class_register(&sdev_class); 359 if (error) 360 bus_unregister(&scsi_bus_type); 361 } 362 363 return error; 364} 365 366void scsi_sysfs_unregister(void) 367{ 368 class_unregister(&sdev_class); 369 bus_unregister(&scsi_bus_type); 370} 371 372/* 373 * sdev_show_function: macro to create an attr function that can be used to 374 * show a non-bit field. 375 */ 376#define sdev_show_function(field, format_string) \ 377static ssize_t \ 378sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \ 379{ \ 380 struct scsi_device *sdev; \ 381 sdev = to_scsi_device(dev); \ 382 return snprintf (buf, 20, format_string, sdev->field); \ 383} \ 384 385/* 386 * sdev_rd_attr: macro to create a function and attribute variable for a 387 * read only field. 388 */ 389#define sdev_rd_attr(field, format_string) \ 390 sdev_show_function(field, format_string) \ 391static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 392 393 394/* 395 * sdev_rd_attr: create a function and attribute variable for a 396 * read/write field. 397 */ 398#define sdev_rw_attr(field, format_string) \ 399 sdev_show_function(field, format_string) \ 400 \ 401static ssize_t \ 402sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 403{ \ 404 struct scsi_device *sdev; \ 405 sdev = to_scsi_device(dev); \ 406 snscanf (buf, 20, format_string, &sdev->field); \ 407 return count; \ 408} \ 409static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 410 411/* Currently we don't export bit fields, but we might in future, 412 * so leave this code in */ 413#if 0 414/* 415 * sdev_rd_attr: create a function and attribute variable for a 416 * read/write bit field. 417 */ 418#define sdev_rw_attr_bit(field) \ 419 sdev_show_function(field, "%d\n") \ 420 \ 421static ssize_t \ 422sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 423{ \ 424 int ret; \ 425 struct scsi_device *sdev; \ 426 ret = scsi_sdev_check_buf_bit(buf); \ 427 if (ret >= 0) { \ 428 sdev = to_scsi_device(dev); \ 429 sdev->field = ret; \ 430 ret = count; \ 431 } \ 432 return ret; \ 433} \ 434static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 435 436/* 437 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 438 * else return -EINVAL. 439 */ 440static int scsi_sdev_check_buf_bit(const char *buf) 441{ 442 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 443 if (buf[0] == '1') 444 return 1; 445 else if (buf[0] == '0') 446 return 0; 447 else 448 return -EINVAL; 449 } else 450 return -EINVAL; 451} 452#endif 453/* 454 * Create the actual show/store functions and data structures. 455 */ 456sdev_rd_attr (device_blocked, "%d\n"); 457sdev_rd_attr (queue_depth, "%d\n"); 458sdev_rd_attr (type, "%d\n"); 459sdev_rd_attr (scsi_level, "%d\n"); 460sdev_rd_attr (vendor, "%.8s\n"); 461sdev_rd_attr (model, "%.16s\n"); 462sdev_rd_attr (rev, "%.4s\n"); 463 464static ssize_t 465sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 466{ 467 struct scsi_device *sdev; 468 sdev = to_scsi_device(dev); 469 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 470} 471 472static ssize_t 473sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 474{ 475 struct scsi_device *sdev; 476 int timeout; 477 sdev = to_scsi_device(dev); 478 sscanf (buf, "%d\n", &timeout); 479 sdev->timeout = timeout * HZ; 480 return count; 481} 482static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 483 484static ssize_t 485store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 486{ 487 scsi_rescan_device(dev); 488 return count; 489} 490static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 491 492static void sdev_store_delete_callback(struct device *dev) 493{ 494 scsi_remove_device(to_scsi_device(dev)); 495} 496 497static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 498 size_t count) 499{ 500 int rc; 501 502 /* An attribute cannot be unregistered by one of its own methods, 503 * so we have to use this roundabout approach. 504 */ 505 rc = device_schedule_callback(dev, sdev_store_delete_callback); 506 if (rc) 507 count = rc; 508 return count; 509}; 510static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 511 512static ssize_t 513store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 514{ 515 int i; 516 struct scsi_device *sdev = to_scsi_device(dev); 517 enum scsi_device_state state = 0; 518 519 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 520 const int len = strlen(sdev_states[i].name); 521 if (strncmp(sdev_states[i].name, buf, len) == 0 && 522 buf[len] == '\n') { 523 state = sdev_states[i].value; 524 break; 525 } 526 } 527 if (!state) 528 return -EINVAL; 529 530 if (scsi_device_set_state(sdev, state)) 531 return -EINVAL; 532 return count; 533} 534 535static ssize_t 536show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 537{ 538 struct scsi_device *sdev = to_scsi_device(dev); 539 const char *name = scsi_device_state_name(sdev->sdev_state); 540 541 if (!name) 542 return -EINVAL; 543 544 return snprintf(buf, 20, "%s\n", name); 545} 546 547static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 548 549static ssize_t 550show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf) 551{ 552 struct scsi_device *sdev = to_scsi_device(dev); 553 const char *name = "none"; 554 555 if (sdev->ordered_tags) 556 name = "ordered"; 557 else if (sdev->simple_tags) 558 name = "simple"; 559 560 return snprintf(buf, 20, "%s\n", name); 561} 562 563static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 564 565static ssize_t 566show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 567{ 568 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 569} 570 571static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 572 573#define show_sdev_iostat(field) \ 574static ssize_t \ 575show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \ 576{ \ 577 struct scsi_device *sdev = to_scsi_device(dev); \ 578 unsigned long long count = atomic_read(&sdev->field); \ 579 return snprintf(buf, 20, "0x%llx\n", count); \ 580} \ 581static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 582 583show_sdev_iostat(iorequest_cnt); 584show_sdev_iostat(iodone_cnt); 585show_sdev_iostat(ioerr_cnt); 586 587static ssize_t 588sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 589{ 590 struct scsi_device *sdev; 591 sdev = to_scsi_device(dev); 592 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 593} 594static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 595 596/* Default template for device attributes. May NOT be modified */ 597static struct device_attribute *scsi_sysfs_sdev_attrs[] = { 598 &dev_attr_device_blocked, 599 &dev_attr_queue_depth, 600 &dev_attr_queue_type, 601 &dev_attr_type, 602 &dev_attr_scsi_level, 603 &dev_attr_vendor, 604 &dev_attr_model, 605 &dev_attr_rev, 606 &dev_attr_rescan, 607 &dev_attr_delete, 608 &dev_attr_state, 609 &dev_attr_timeout, 610 &dev_attr_iocounterbits, 611 &dev_attr_iorequest_cnt, 612 &dev_attr_iodone_cnt, 613 &dev_attr_ioerr_cnt, 614 &dev_attr_modalias, 615 NULL 616}; 617 618static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf, 619 size_t count) 620{ 621 int depth, retval; 622 struct scsi_device *sdev = to_scsi_device(dev); 623 struct scsi_host_template *sht = sdev->host->hostt; 624 625 if (!sht->change_queue_depth) 626 return -EINVAL; 627 628 depth = simple_strtoul(buf, NULL, 0); 629 630 if (depth < 1) 631 return -EINVAL; 632 633 retval = sht->change_queue_depth(sdev, depth); 634 if (retval < 0) 635 return retval; 636 637 return count; 638} 639 640static struct device_attribute sdev_attr_queue_depth_rw = 641 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 642 sdev_store_queue_depth_rw); 643 644static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, 645 size_t count) 646{ 647 struct scsi_device *sdev = to_scsi_device(dev); 648 struct scsi_host_template *sht = sdev->host->hostt; 649 int tag_type = 0, retval; 650 int prev_tag_type = scsi_get_tag_type(sdev); 651 652 if (!sdev->tagged_supported || !sht->change_queue_type) 653 return -EINVAL; 654 655 if (strncmp(buf, "ordered", 7) == 0) 656 tag_type = MSG_ORDERED_TAG; 657 else if (strncmp(buf, "simple", 6) == 0) 658 tag_type = MSG_SIMPLE_TAG; 659 else if (strncmp(buf, "none", 4) != 0) 660 return -EINVAL; 661 662 if (tag_type == prev_tag_type) 663 return count; 664 665 retval = sht->change_queue_type(sdev, tag_type); 666 if (retval < 0) 667 return retval; 668 669 return count; 670} 671 672static struct device_attribute sdev_attr_queue_type_rw = 673 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 674 sdev_store_queue_type_rw); 675 676static struct device_attribute *attr_changed_internally( 677 struct Scsi_Host *shost, 678 struct device_attribute * attr) 679{ 680 if (!strcmp("queue_depth", attr->attr.name) 681 && shost->hostt->change_queue_depth) 682 return &sdev_attr_queue_depth_rw; 683 else if (!strcmp("queue_type", attr->attr.name) 684 && shost->hostt->change_queue_type) 685 return &sdev_attr_queue_type_rw; 686 return attr; 687} 688 689 690static struct device_attribute *attr_overridden( 691 struct device_attribute **attrs, 692 struct device_attribute *attr) 693{ 694 int i; 695 696 if (!attrs) 697 return NULL; 698 for (i = 0; attrs[i]; i++) 699 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 700 return attrs[i]; 701 return NULL; 702} 703 704static int attr_add(struct device *dev, struct device_attribute *attr) 705{ 706 struct device_attribute *base_attr; 707 708 /* 709 * Spare the caller from having to copy things it's not interested in. 710 */ 711 base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr); 712 if (base_attr) { 713 /* extend permissions */ 714 attr->attr.mode |= base_attr->attr.mode; 715 716 /* override null show/store with default */ 717 if (!attr->show) 718 attr->show = base_attr->show; 719 if (!attr->store) 720 attr->store = base_attr->store; 721 } 722 723 return device_create_file(dev, attr); 724} 725 726/** 727 * scsi_sysfs_add_sdev - add scsi device to sysfs 728 * @sdev: scsi_device to add 729 * 730 * Return value: 731 * 0 on Success / non-zero on Failure 732 **/ 733int scsi_sysfs_add_sdev(struct scsi_device *sdev) 734{ 735 int error, i; 736 737 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 738 return error; 739 740 error = device_add(&sdev->sdev_gendev); 741 if (error) { 742 put_device(sdev->sdev_gendev.parent); 743 printk(KERN_INFO "error 1\n"); 744 return error; 745 } 746 error = class_device_add(&sdev->sdev_classdev); 747 if (error) { 748 printk(KERN_INFO "error 2\n"); 749 goto clean_device; 750 } 751 752 /* take a reference for the sdev_classdev; this is 753 * released by the sdev_class .release */ 754 get_device(&sdev->sdev_gendev); 755 if (sdev->host->hostt->sdev_attrs) { 756 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 757 error = attr_add(&sdev->sdev_gendev, 758 sdev->host->hostt->sdev_attrs[i]); 759 if (error) { 760 __scsi_remove_device(sdev); 761 goto out; 762 } 763 } 764 } 765 766 for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) { 767 if (!attr_overridden(sdev->host->hostt->sdev_attrs, 768 scsi_sysfs_sdev_attrs[i])) { 769 struct device_attribute * attr = 770 attr_changed_internally(sdev->host, 771 scsi_sysfs_sdev_attrs[i]); 772 error = device_create_file(&sdev->sdev_gendev, attr); 773 if (error) { 774 __scsi_remove_device(sdev); 775 goto out; 776 } 777 } 778 } 779 780 transport_add_device(&sdev->sdev_gendev); 781 out: 782 return error; 783 784 clean_device: 785 scsi_device_set_state(sdev, SDEV_CANCEL); 786 787 device_del(&sdev->sdev_gendev); 788 transport_destroy_device(&sdev->sdev_gendev); 789 put_device(&sdev->sdev_gendev); 790 791 return error; 792} 793 794void __scsi_remove_device(struct scsi_device *sdev) 795{ 796 struct device *dev = &sdev->sdev_gendev; 797 798 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 799 return; 800 801 class_device_unregister(&sdev->sdev_classdev); 802 transport_remove_device(dev); 803 device_del(dev); 804 scsi_device_set_state(sdev, SDEV_DEL); 805 if (sdev->host->hostt->slave_destroy) 806 sdev->host->hostt->slave_destroy(sdev); 807 transport_destroy_device(dev); 808 put_device(dev); 809} 810 811/** 812 * scsi_remove_device - unregister a device from the scsi bus 813 * @sdev: scsi_device to unregister 814 **/ 815void scsi_remove_device(struct scsi_device *sdev) 816{ 817 struct Scsi_Host *shost = sdev->host; 818 819 mutex_lock(&shost->scan_mutex); 820 __scsi_remove_device(sdev); 821 mutex_unlock(&shost->scan_mutex); 822} 823EXPORT_SYMBOL(scsi_remove_device); 824 825void __scsi_remove_target(struct scsi_target *starget) 826{ 827 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 828 unsigned long flags; 829 struct scsi_device *sdev; 830 831 spin_lock_irqsave(shost->host_lock, flags); 832 starget->reap_ref++; 833 restart: 834 list_for_each_entry(sdev, &shost->__devices, siblings) { 835 if (sdev->channel != starget->channel || 836 sdev->id != starget->id || 837 sdev->sdev_state == SDEV_DEL) 838 continue; 839 spin_unlock_irqrestore(shost->host_lock, flags); 840 scsi_remove_device(sdev); 841 spin_lock_irqsave(shost->host_lock, flags); 842 goto restart; 843 } 844 spin_unlock_irqrestore(shost->host_lock, flags); 845 scsi_target_reap(starget); 846} 847 848static int __remove_child (struct device * dev, void * data) 849{ 850 if (scsi_is_target_device(dev)) 851 __scsi_remove_target(to_scsi_target(dev)); 852 return 0; 853} 854 855/** 856 * scsi_remove_target - try to remove a target and all its devices 857 * @dev: generic starget or parent of generic stargets to be removed 858 * 859 * Note: This is slightly racy. It is possible that if the user 860 * requests the addition of another device then the target won't be 861 * removed. 862 */ 863void scsi_remove_target(struct device *dev) 864{ 865 struct device *rdev; 866 867 if (scsi_is_target_device(dev)) { 868 __scsi_remove_target(to_scsi_target(dev)); 869 return; 870 } 871 872 rdev = get_device(dev); 873 device_for_each_child(dev, NULL, __remove_child); 874 put_device(rdev); 875} 876EXPORT_SYMBOL(scsi_remove_target); 877 878int scsi_register_driver(struct device_driver *drv) 879{ 880 drv->bus = &scsi_bus_type; 881 882 return driver_register(drv); 883} 884EXPORT_SYMBOL(scsi_register_driver); 885 886int scsi_register_interface(struct class_interface *intf) 887{ 888 intf->class = &sdev_class; 889 890 return class_interface_register(intf); 891} 892EXPORT_SYMBOL(scsi_register_interface); 893 894 895static struct class_device_attribute *class_attr_overridden( 896 struct class_device_attribute **attrs, 897 struct class_device_attribute *attr) 898{ 899 int i; 900 901 if (!attrs) 902 return NULL; 903 for (i = 0; attrs[i]; i++) 904 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 905 return attrs[i]; 906 return NULL; 907} 908 909static int class_attr_add(struct class_device *classdev, 910 struct class_device_attribute *attr) 911{ 912 struct class_device_attribute *base_attr; 913 914 /* 915 * Spare the caller from having to copy things it's not interested in. 916 */ 917 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); 918 if (base_attr) { 919 /* extend permissions */ 920 attr->attr.mode |= base_attr->attr.mode; 921 922 /* override null show/store with default */ 923 if (!attr->show) 924 attr->show = base_attr->show; 925 if (!attr->store) 926 attr->store = base_attr->store; 927 } 928 929 return class_device_create_file(classdev, attr); 930} 931 932/** 933 * scsi_sysfs_add_host - add scsi host to subsystem 934 * @shost: scsi host struct to add to subsystem 935 * @dev: parent struct device pointer 936 **/ 937int scsi_sysfs_add_host(struct Scsi_Host *shost) 938{ 939 int error, i; 940 941 if (shost->hostt->shost_attrs) { 942 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 943 error = class_attr_add(&shost->shost_classdev, 944 shost->hostt->shost_attrs[i]); 945 if (error) 946 return error; 947 } 948 } 949 950 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { 951 if (!class_attr_overridden(shost->hostt->shost_attrs, 952 scsi_sysfs_shost_attrs[i])) { 953 error = class_device_create_file(&shost->shost_classdev, 954 scsi_sysfs_shost_attrs[i]); 955 if (error) 956 return error; 957 } 958 } 959 960 transport_register_device(&shost->shost_gendev); 961 return 0; 962} 963 964void scsi_sysfs_device_initialize(struct scsi_device *sdev) 965{ 966 unsigned long flags; 967 struct Scsi_Host *shost = sdev->host; 968 struct scsi_target *starget = sdev->sdev_target; 969 970 device_initialize(&sdev->sdev_gendev); 971 sdev->sdev_gendev.bus = &scsi_bus_type; 972 sdev->sdev_gendev.release = scsi_device_dev_release; 973 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 974 sdev->host->host_no, sdev->channel, sdev->id, 975 sdev->lun); 976 977 class_device_initialize(&sdev->sdev_classdev); 978 sdev->sdev_classdev.dev = &sdev->sdev_gendev; 979 sdev->sdev_classdev.class = &sdev_class; 980 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, 981 "%d:%d:%d:%d", sdev->host->host_no, 982 sdev->channel, sdev->id, sdev->lun); 983 sdev->scsi_level = starget->scsi_level; 984 transport_setup_device(&sdev->sdev_gendev); 985 spin_lock_irqsave(shost->host_lock, flags); 986 list_add_tail(&sdev->same_target_siblings, &starget->devices); 987 list_add_tail(&sdev->siblings, &shost->__devices); 988 spin_unlock_irqrestore(shost->host_lock, flags); 989} 990 991int scsi_is_sdev_device(const struct device *dev) 992{ 993 return dev->release == scsi_device_dev_release; 994} 995EXPORT_SYMBOL(scsi_is_sdev_device); 996 997/* A blank transport template that is used in drivers that don't 998 * yet implement Transport Attributes */ 999struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1000