scsi_sysfs.c revision bfd129445f23c037d9a440ebfa4109e11c220301
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 193static ssize_t 194show_shost_mode(unsigned int mode, char *buf) 195{ 196 ssize_t len = 0; 197 198 if (mode & MODE_INITIATOR) 199 len = sprintf(buf, "%s", "Initiator"); 200 201 if (mode & MODE_TARGET) 202 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); 203 204 len += sprintf(buf + len, "\n"); 205 206 return len; 207} 208 209static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf) 210{ 211 struct Scsi_Host *shost = class_to_shost(class_dev); 212 213 if (shost->hostt->supported_mode == MODE_UNKNOWN) 214 return snprintf(buf, 20, "unknown\n"); 215 else 216 return show_shost_mode(shost->hostt->supported_mode, buf); 217} 218 219static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); 220 221static ssize_t show_shost_active_mode(struct class_device *class_dev, char *buf) 222{ 223 struct Scsi_Host *shost = class_to_shost(class_dev); 224 225 if (shost->active_mode == MODE_UNKNOWN) 226 return snprintf(buf, 20, "unknown\n"); 227 else 228 return show_shost_mode(shost->active_mode, buf); 229} 230 231static CLASS_DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); 232 233shost_rd_attr(unique_id, "%u\n"); 234shost_rd_attr(host_busy, "%hu\n"); 235shost_rd_attr(cmd_per_lun, "%hd\n"); 236shost_rd_attr(can_queue, "%hd\n"); 237shost_rd_attr(sg_tablesize, "%hu\n"); 238shost_rd_attr(unchecked_isa_dma, "%d\n"); 239shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 240 241static struct class_device_attribute *scsi_sysfs_shost_attrs[] = { 242 &class_device_attr_unique_id, 243 &class_device_attr_host_busy, 244 &class_device_attr_cmd_per_lun, 245 &class_device_attr_can_queue, 246 &class_device_attr_sg_tablesize, 247 &class_device_attr_unchecked_isa_dma, 248 &class_device_attr_proc_name, 249 &class_device_attr_scan, 250 &class_device_attr_state, 251 &class_device_attr_supported_mode, 252 &class_device_attr_active_mode, 253 NULL 254}; 255 256static void scsi_device_cls_release(struct class_device *class_dev) 257{ 258 struct scsi_device *sdev; 259 260 sdev = class_to_sdev(class_dev); 261 put_device(&sdev->sdev_gendev); 262} 263 264static void scsi_device_dev_release_usercontext(struct work_struct *work) 265{ 266 struct scsi_device *sdev; 267 struct device *parent; 268 struct scsi_target *starget; 269 unsigned long flags; 270 271 sdev = container_of(work, struct scsi_device, ew.work); 272 273 parent = sdev->sdev_gendev.parent; 274 starget = to_scsi_target(parent); 275 276 spin_lock_irqsave(sdev->host->host_lock, flags); 277 starget->reap_ref++; 278 list_del(&sdev->siblings); 279 list_del(&sdev->same_target_siblings); 280 list_del(&sdev->starved_entry); 281 spin_unlock_irqrestore(sdev->host->host_lock, flags); 282 283 if (sdev->request_queue) { 284 sdev->request_queue->queuedata = NULL; 285 /* user context needed to free queue */ 286 scsi_free_queue(sdev->request_queue); 287 /* temporary expedient, try to catch use of queue lock 288 * after free of sdev */ 289 sdev->request_queue = NULL; 290 } 291 292 scsi_target_reap(scsi_target(sdev)); 293 294 kfree(sdev->inquiry); 295 kfree(sdev); 296 297 if (parent) 298 put_device(parent); 299} 300 301static void scsi_device_dev_release(struct device *dev) 302{ 303 struct scsi_device *sdp = to_scsi_device(dev); 304 execute_in_process_context(scsi_device_dev_release_usercontext, 305 &sdp->ew); 306} 307 308static struct class sdev_class = { 309 .name = "scsi_device", 310 .release = scsi_device_cls_release, 311}; 312 313/* all probing is done in the individual ->probe routines */ 314static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 315{ 316 struct scsi_device *sdp = to_scsi_device(dev); 317 if (sdp->no_uld_attach) 318 return 0; 319 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 320} 321 322static int scsi_bus_uevent(struct device *dev, char **envp, int num_envp, 323 char *buffer, int buffer_size) 324{ 325 struct scsi_device *sdev = to_scsi_device(dev); 326 int i = 0; 327 int length = 0; 328 329 add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, 330 "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 331 envp[i] = NULL; 332 return 0; 333} 334 335static int scsi_bus_suspend(struct device * dev, pm_message_t state) 336{ 337 struct device_driver *drv = dev->driver; 338 struct scsi_device *sdev = to_scsi_device(dev); 339 int err; 340 341 err = scsi_device_quiesce(sdev); 342 if (err) 343 return err; 344 345 if (drv && drv->suspend) { 346 err = drv->suspend(dev, state); 347 if (err) 348 return err; 349 } 350 351 return 0; 352} 353 354static int scsi_bus_resume(struct device * dev) 355{ 356 struct device_driver *drv = dev->driver; 357 struct scsi_device *sdev = to_scsi_device(dev); 358 int err = 0; 359 360 if (drv && drv->resume) 361 err = drv->resume(dev); 362 363 scsi_device_resume(sdev); 364 365 return err; 366} 367 368struct bus_type scsi_bus_type = { 369 .name = "scsi", 370 .match = scsi_bus_match, 371 .uevent = scsi_bus_uevent, 372 .suspend = scsi_bus_suspend, 373 .resume = scsi_bus_resume, 374}; 375 376int scsi_sysfs_register(void) 377{ 378 int error; 379 380 error = bus_register(&scsi_bus_type); 381 if (!error) { 382 error = class_register(&sdev_class); 383 if (error) 384 bus_unregister(&scsi_bus_type); 385 } 386 387 return error; 388} 389 390void scsi_sysfs_unregister(void) 391{ 392 class_unregister(&sdev_class); 393 bus_unregister(&scsi_bus_type); 394} 395 396/* 397 * sdev_show_function: macro to create an attr function that can be used to 398 * show a non-bit field. 399 */ 400#define sdev_show_function(field, format_string) \ 401static ssize_t \ 402sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \ 403{ \ 404 struct scsi_device *sdev; \ 405 sdev = to_scsi_device(dev); \ 406 return snprintf (buf, 20, format_string, sdev->field); \ 407} \ 408 409/* 410 * sdev_rd_attr: macro to create a function and attribute variable for a 411 * read only field. 412 */ 413#define sdev_rd_attr(field, format_string) \ 414 sdev_show_function(field, format_string) \ 415static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 416 417 418/* 419 * sdev_rd_attr: create a function and attribute variable for a 420 * read/write field. 421 */ 422#define sdev_rw_attr(field, format_string) \ 423 sdev_show_function(field, format_string) \ 424 \ 425static ssize_t \ 426sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 427{ \ 428 struct scsi_device *sdev; \ 429 sdev = to_scsi_device(dev); \ 430 snscanf (buf, 20, format_string, &sdev->field); \ 431 return count; \ 432} \ 433static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 434 435/* Currently we don't export bit fields, but we might in future, 436 * so leave this code in */ 437#if 0 438/* 439 * sdev_rd_attr: create a function and attribute variable for a 440 * read/write bit field. 441 */ 442#define sdev_rw_attr_bit(field) \ 443 sdev_show_function(field, "%d\n") \ 444 \ 445static ssize_t \ 446sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 447{ \ 448 int ret; \ 449 struct scsi_device *sdev; \ 450 ret = scsi_sdev_check_buf_bit(buf); \ 451 if (ret >= 0) { \ 452 sdev = to_scsi_device(dev); \ 453 sdev->field = ret; \ 454 ret = count; \ 455 } \ 456 return ret; \ 457} \ 458static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 459 460/* 461 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 462 * else return -EINVAL. 463 */ 464static int scsi_sdev_check_buf_bit(const char *buf) 465{ 466 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 467 if (buf[0] == '1') 468 return 1; 469 else if (buf[0] == '0') 470 return 0; 471 else 472 return -EINVAL; 473 } else 474 return -EINVAL; 475} 476#endif 477/* 478 * Create the actual show/store functions and data structures. 479 */ 480sdev_rd_attr (device_blocked, "%d\n"); 481sdev_rd_attr (queue_depth, "%d\n"); 482sdev_rd_attr (type, "%d\n"); 483sdev_rd_attr (scsi_level, "%d\n"); 484sdev_rd_attr (vendor, "%.8s\n"); 485sdev_rd_attr (model, "%.16s\n"); 486sdev_rd_attr (rev, "%.4s\n"); 487 488static ssize_t 489sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 490{ 491 struct scsi_device *sdev; 492 sdev = to_scsi_device(dev); 493 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 494} 495 496static ssize_t 497sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 498{ 499 struct scsi_device *sdev; 500 int timeout; 501 sdev = to_scsi_device(dev); 502 sscanf (buf, "%d\n", &timeout); 503 sdev->timeout = timeout * HZ; 504 return count; 505} 506static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 507 508static ssize_t 509store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 510{ 511 scsi_rescan_device(dev); 512 return count; 513} 514static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 515 516static void sdev_store_delete_callback(struct device *dev) 517{ 518 scsi_remove_device(to_scsi_device(dev)); 519} 520 521static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 522 size_t count) 523{ 524 int rc; 525 526 /* An attribute cannot be unregistered by one of its own methods, 527 * so we have to use this roundabout approach. 528 */ 529 rc = device_schedule_callback(dev, sdev_store_delete_callback); 530 if (rc) 531 count = rc; 532 return count; 533}; 534static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 535 536static ssize_t 537store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 538{ 539 int i; 540 struct scsi_device *sdev = to_scsi_device(dev); 541 enum scsi_device_state state = 0; 542 543 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 544 const int len = strlen(sdev_states[i].name); 545 if (strncmp(sdev_states[i].name, buf, len) == 0 && 546 buf[len] == '\n') { 547 state = sdev_states[i].value; 548 break; 549 } 550 } 551 if (!state) 552 return -EINVAL; 553 554 if (scsi_device_set_state(sdev, state)) 555 return -EINVAL; 556 return count; 557} 558 559static ssize_t 560show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 561{ 562 struct scsi_device *sdev = to_scsi_device(dev); 563 const char *name = scsi_device_state_name(sdev->sdev_state); 564 565 if (!name) 566 return -EINVAL; 567 568 return snprintf(buf, 20, "%s\n", name); 569} 570 571static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 572 573static ssize_t 574show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf) 575{ 576 struct scsi_device *sdev = to_scsi_device(dev); 577 const char *name = "none"; 578 579 if (sdev->ordered_tags) 580 name = "ordered"; 581 else if (sdev->simple_tags) 582 name = "simple"; 583 584 return snprintf(buf, 20, "%s\n", name); 585} 586 587static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 588 589static ssize_t 590show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 591{ 592 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 593} 594 595static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 596 597#define show_sdev_iostat(field) \ 598static ssize_t \ 599show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \ 600{ \ 601 struct scsi_device *sdev = to_scsi_device(dev); \ 602 unsigned long long count = atomic_read(&sdev->field); \ 603 return snprintf(buf, 20, "0x%llx\n", count); \ 604} \ 605static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 606 607show_sdev_iostat(iorequest_cnt); 608show_sdev_iostat(iodone_cnt); 609show_sdev_iostat(ioerr_cnt); 610 611static ssize_t 612sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 613{ 614 struct scsi_device *sdev; 615 sdev = to_scsi_device(dev); 616 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 617} 618static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 619 620/* Default template for device attributes. May NOT be modified */ 621static struct attribute *scsi_sdev_attrs[] = { 622 &dev_attr_device_blocked.attr, 623 &dev_attr_type.attr, 624 &dev_attr_scsi_level.attr, 625 &dev_attr_vendor.attr, 626 &dev_attr_model.attr, 627 &dev_attr_rev.attr, 628 &dev_attr_rescan.attr, 629 &dev_attr_delete.attr, 630 &dev_attr_state.attr, 631 &dev_attr_timeout.attr, 632 &dev_attr_iocounterbits.attr, 633 &dev_attr_iorequest_cnt.attr, 634 &dev_attr_iodone_cnt.attr, 635 &dev_attr_ioerr_cnt.attr, 636 &dev_attr_modalias.attr, 637 NULL 638}; 639 640static struct attribute_group scsi_sdev_attr_group = { 641 .attrs = scsi_sdev_attrs, 642}; 643 644static struct attribute_group *scsi_sdev_attr_groups[] = { 645 &scsi_sdev_attr_group, 646 NULL 647}; 648 649static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf, 650 size_t count) 651{ 652 int depth, retval; 653 struct scsi_device *sdev = to_scsi_device(dev); 654 struct scsi_host_template *sht = sdev->host->hostt; 655 656 if (!sht->change_queue_depth) 657 return -EINVAL; 658 659 depth = simple_strtoul(buf, NULL, 0); 660 661 if (depth < 1) 662 return -EINVAL; 663 664 retval = sht->change_queue_depth(sdev, depth); 665 if (retval < 0) 666 return retval; 667 668 return count; 669} 670 671static struct device_attribute sdev_attr_queue_depth_rw = 672 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 673 sdev_store_queue_depth_rw); 674 675static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, 676 size_t count) 677{ 678 struct scsi_device *sdev = to_scsi_device(dev); 679 struct scsi_host_template *sht = sdev->host->hostt; 680 int tag_type = 0, retval; 681 int prev_tag_type = scsi_get_tag_type(sdev); 682 683 if (!sdev->tagged_supported || !sht->change_queue_type) 684 return -EINVAL; 685 686 if (strncmp(buf, "ordered", 7) == 0) 687 tag_type = MSG_ORDERED_TAG; 688 else if (strncmp(buf, "simple", 6) == 0) 689 tag_type = MSG_SIMPLE_TAG; 690 else if (strncmp(buf, "none", 4) != 0) 691 return -EINVAL; 692 693 if (tag_type == prev_tag_type) 694 return count; 695 696 retval = sht->change_queue_type(sdev, tag_type); 697 if (retval < 0) 698 return retval; 699 700 return count; 701} 702 703static struct device_attribute sdev_attr_queue_type_rw = 704 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 705 sdev_store_queue_type_rw); 706 707/** 708 * scsi_sysfs_add_sdev - add scsi device to sysfs 709 * @sdev: scsi_device to add 710 * 711 * Return value: 712 * 0 on Success / non-zero on Failure 713 **/ 714int scsi_sysfs_add_sdev(struct scsi_device *sdev) 715{ 716 int error, i; 717 struct request_queue *rq = sdev->request_queue; 718 719 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 720 return error; 721 722 error = device_add(&sdev->sdev_gendev); 723 if (error) { 724 put_device(sdev->sdev_gendev.parent); 725 printk(KERN_INFO "error 1\n"); 726 return error; 727 } 728 error = class_device_add(&sdev->sdev_classdev); 729 if (error) { 730 printk(KERN_INFO "error 2\n"); 731 goto clean_device; 732 } 733 734 /* take a reference for the sdev_classdev; this is 735 * released by the sdev_class .release */ 736 get_device(&sdev->sdev_gendev); 737 738 /* create queue files, which may be writable, depending on the host */ 739 if (sdev->host->hostt->change_queue_depth) 740 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw); 741 else 742 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth); 743 if (error) { 744 __scsi_remove_device(sdev); 745 goto out; 746 } 747 if (sdev->host->hostt->change_queue_type) 748 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw); 749 else 750 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type); 751 if (error) { 752 __scsi_remove_device(sdev); 753 goto out; 754 } 755 756 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL); 757 758 if (error) 759 sdev_printk(KERN_INFO, sdev, 760 "Failed to register bsg queue, errno=%d\n", error); 761 762 /* we're treating error on bsg register as non-fatal, so pretend 763 * nothing went wrong */ 764 error = 0; 765 766 /* add additional host specific attributes */ 767 if (sdev->host->hostt->sdev_attrs) { 768 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 769 error = device_create_file(&sdev->sdev_gendev, 770 sdev->host->hostt->sdev_attrs[i]); 771 if (error) { 772 __scsi_remove_device(sdev); 773 goto out; 774 } 775 } 776 } 777 778 transport_add_device(&sdev->sdev_gendev); 779 out: 780 return error; 781 782 clean_device: 783 scsi_device_set_state(sdev, SDEV_CANCEL); 784 785 device_del(&sdev->sdev_gendev); 786 transport_destroy_device(&sdev->sdev_gendev); 787 put_device(&sdev->sdev_gendev); 788 789 return error; 790} 791 792void __scsi_remove_device(struct scsi_device *sdev) 793{ 794 struct device *dev = &sdev->sdev_gendev; 795 796 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 797 return; 798 799 bsg_unregister_queue(sdev->request_queue); 800 class_device_unregister(&sdev->sdev_classdev); 801 transport_remove_device(dev); 802 device_del(dev); 803 scsi_device_set_state(sdev, SDEV_DEL); 804 if (sdev->host->hostt->slave_destroy) 805 sdev->host->hostt->slave_destroy(sdev); 806 transport_destroy_device(dev); 807 put_device(dev); 808} 809 810/** 811 * scsi_remove_device - unregister a device from the scsi bus 812 * @sdev: scsi_device to unregister 813 **/ 814void scsi_remove_device(struct scsi_device *sdev) 815{ 816 struct Scsi_Host *shost = sdev->host; 817 818 mutex_lock(&shost->scan_mutex); 819 __scsi_remove_device(sdev); 820 mutex_unlock(&shost->scan_mutex); 821} 822EXPORT_SYMBOL(scsi_remove_device); 823 824static void __scsi_remove_target(struct scsi_target *starget) 825{ 826 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 827 unsigned long flags; 828 struct scsi_device *sdev; 829 830 spin_lock_irqsave(shost->host_lock, flags); 831 starget->reap_ref++; 832 restart: 833 list_for_each_entry(sdev, &shost->__devices, siblings) { 834 if (sdev->channel != starget->channel || 835 sdev->id != starget->id || 836 sdev->sdev_state == SDEV_DEL) 837 continue; 838 spin_unlock_irqrestore(shost->host_lock, flags); 839 scsi_remove_device(sdev); 840 spin_lock_irqsave(shost->host_lock, flags); 841 goto restart; 842 } 843 spin_unlock_irqrestore(shost->host_lock, flags); 844 scsi_target_reap(starget); 845} 846 847static int __remove_child (struct device * dev, void * data) 848{ 849 if (scsi_is_target_device(dev)) 850 __scsi_remove_target(to_scsi_target(dev)); 851 return 0; 852} 853 854/** 855 * scsi_remove_target - try to remove a target and all its devices 856 * @dev: generic starget or parent of generic stargets to be removed 857 * 858 * Note: This is slightly racy. It is possible that if the user 859 * requests the addition of another device then the target won't be 860 * removed. 861 */ 862void scsi_remove_target(struct device *dev) 863{ 864 struct device *rdev; 865 866 if (scsi_is_target_device(dev)) { 867 __scsi_remove_target(to_scsi_target(dev)); 868 return; 869 } 870 871 rdev = get_device(dev); 872 device_for_each_child(dev, NULL, __remove_child); 873 put_device(rdev); 874} 875EXPORT_SYMBOL(scsi_remove_target); 876 877int scsi_register_driver(struct device_driver *drv) 878{ 879 drv->bus = &scsi_bus_type; 880 881 return driver_register(drv); 882} 883EXPORT_SYMBOL(scsi_register_driver); 884 885int scsi_register_interface(struct class_interface *intf) 886{ 887 intf->class = &sdev_class; 888 889 return class_interface_register(intf); 890} 891EXPORT_SYMBOL(scsi_register_interface); 892 893 894static struct class_device_attribute *class_attr_overridden( 895 struct class_device_attribute **attrs, 896 struct class_device_attribute *attr) 897{ 898 int i; 899 900 if (!attrs) 901 return NULL; 902 for (i = 0; attrs[i]; i++) 903 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 904 return attrs[i]; 905 return NULL; 906} 907 908static int class_attr_add(struct class_device *classdev, 909 struct class_device_attribute *attr) 910{ 911 struct class_device_attribute *base_attr; 912 913 /* 914 * Spare the caller from having to copy things it's not interested in. 915 */ 916 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); 917 if (base_attr) { 918 /* extend permissions */ 919 attr->attr.mode |= base_attr->attr.mode; 920 921 /* override null show/store with default */ 922 if (!attr->show) 923 attr->show = base_attr->show; 924 if (!attr->store) 925 attr->store = base_attr->store; 926 } 927 928 return class_device_create_file(classdev, attr); 929} 930 931/** 932 * scsi_sysfs_add_host - add scsi host to subsystem 933 * @shost: scsi host struct to add to subsystem 934 * @dev: parent struct device pointer 935 **/ 936int scsi_sysfs_add_host(struct Scsi_Host *shost) 937{ 938 int error, i; 939 940 if (shost->hostt->shost_attrs) { 941 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 942 error = class_attr_add(&shost->shost_classdev, 943 shost->hostt->shost_attrs[i]); 944 if (error) 945 return error; 946 } 947 } 948 949 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { 950 if (!class_attr_overridden(shost->hostt->shost_attrs, 951 scsi_sysfs_shost_attrs[i])) { 952 error = class_device_create_file(&shost->shost_classdev, 953 scsi_sysfs_shost_attrs[i]); 954 if (error) 955 return error; 956 } 957 } 958 959 transport_register_device(&shost->shost_gendev); 960 return 0; 961} 962 963static struct device_type scsi_dev_type = { 964 .name = "scsi_device", 965 .release = scsi_device_dev_release, 966 .groups = scsi_sdev_attr_groups, 967}; 968 969void scsi_sysfs_device_initialize(struct scsi_device *sdev) 970{ 971 unsigned long flags; 972 struct Scsi_Host *shost = sdev->host; 973 struct scsi_target *starget = sdev->sdev_target; 974 975 device_initialize(&sdev->sdev_gendev); 976 sdev->sdev_gendev.bus = &scsi_bus_type; 977 sdev->sdev_gendev.type = &scsi_dev_type; 978 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 979 sdev->host->host_no, sdev->channel, sdev->id, 980 sdev->lun); 981 982 class_device_initialize(&sdev->sdev_classdev); 983 sdev->sdev_classdev.dev = &sdev->sdev_gendev; 984 sdev->sdev_classdev.class = &sdev_class; 985 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, 986 "%d:%d:%d:%d", sdev->host->host_no, 987 sdev->channel, sdev->id, sdev->lun); 988 sdev->scsi_level = starget->scsi_level; 989 transport_setup_device(&sdev->sdev_gendev); 990 spin_lock_irqsave(shost->host_lock, flags); 991 list_add_tail(&sdev->same_target_siblings, &starget->devices); 992 list_add_tail(&sdev->siblings, &shost->__devices); 993 spin_unlock_irqrestore(shost->host_lock, flags); 994} 995 996int scsi_is_sdev_device(const struct device *dev) 997{ 998 return dev->release == scsi_device_dev_release; 999} 1000EXPORT_SYMBOL(scsi_is_sdev_device); 1001 1002/* A blank transport template that is used in drivers that don't 1003 * yet implement Transport Attributes */ 1004struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1005