drivers/scsi/scsi_sysfs.c

   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/slab.h>
  11 #include <linux/init.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/device.h>
  14
  15 #include <scsi/scsi.h>
  16 #include <scsi/scsi_device.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_tcq.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_driver.h>
  21
  22 #include "scsi_priv.h"
  23 #include "scsi_logging.h"
  24
  25 static struct device_type scsi_dev_type;
  26
  27 static const struct {
  28         enum scsi_device_state  value;
  29         char                    *name;
  30 } sdev_states[] = {
  31         { SDEV_CREATED, "created" },
  32         { SDEV_RUNNING, "running" },
  33         { SDEV_CANCEL, "cancel" },
  34         { SDEV_DEL, "deleted" },
  35         { SDEV_QUIESCE, "quiesce" },
  36         { SDEV_OFFLINE, "offline" },
  37         { SDEV_BLOCK,   "blocked" },
  38         { SDEV_CREATED_BLOCK, "created-blocked" },
  39 };
  40
  41 const char *scsi_device_state_name(enum scsi_device_state state)
  42 {
  43         int i;
  44         char *name = NULL;
  45
  46         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  47                 if (sdev_states[i].value == state) {
  48                         name = sdev_states[i].name;
  49                         break;
  50                 }
  51         }
  52         return name;
  53 }
  54
  55 static const struct {
  56         enum scsi_host_state    value;
  57         char                    *name;
  58 } shost_states[] = {
  59         { SHOST_CREATED, "created" },
  60         { SHOST_RUNNING, "running" },
  61         { SHOST_CANCEL, "cancel" },
  62         { SHOST_DEL, "deleted" },
  63         { SHOST_RECOVERY, "recovery" },
  64         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  65         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  66 };
  67 const char *scsi_host_state_name(enum scsi_host_state state)
  68 {
  69         int i;
  70         char *name = NULL;
  71
  72         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  73                 if (shost_states[i].value == state) {
  74                         name = shost_states[i].name;
  75                         break;
  76                 }
  77         }
  78         return name;
  79 }
  80
  81 static int check_set(unsigned int *val, char *src)
  82 {
  83         char *last;
  84
  85         if (strncmp(src, "-", 20) == 0) {
  86                 *val = SCAN_WILD_CARD;
  87         } else {
  88                 /*
  89                  * Doesn't check for int overflow
  90                  */
  91                 *val = simple_strtoul(src, &last, 0);
  92                 if (*last != '\0')
  93                         return 1;
  94         }
  95         return 0;
  96 }
  97
  98 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  99 {
 100         char s1[15], s2[15], s3[15], junk;
 101         unsigned int channel, id, lun;
 102         int res;
 103
 104         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 105         if (res != 3)
 106                 return -EINVAL;
 107         if (check_set(&channel, s1))
 108                 return -EINVAL;
 109         if (check_set(&id, s2))
 110                 return -EINVAL;
 111         if (check_set(&lun, s3))
 112                 return -EINVAL;
 113         if (shost->transportt->user_scan)
 114                 res = shost->transportt->user_scan(shost, channel, id, lun);
 115         else
 116                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 117         return res;
 118 }
 119
 120 /*
 121  * shost_show_function: macro to create an attr function that can be used to
 122  * show a non-bit field.
 123  */
 124 #define shost_show_function(name, field, format_string)                 \
 125 static ssize_t                                                          \
 126 show_##name (struct device *dev, struct device_attribute *attr,         \
 127              char *buf)                                                 \
 128 {                                                                       \
 129         struct Scsi_Host *shost = class_to_shost(dev);                  \
 130         return snprintf (buf, 20, format_string, shost->field);         \
 131 }
 132
 133 /*
 134  * shost_rd_attr: macro to create a function and attribute variable for a
 135  * read only field.
 136  */
 137 #define shost_rd_attr2(name, field, format_string)                      \
 138         shost_show_function(name, field, format_string)                 \
 139 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 140
 141 #define shost_rd_attr(field, format_string) \
 142 shost_rd_attr2(field, field, format_string)
 143
 144 /*
 145  * Create the actual show/store functions and data structures.
 146  */
 147
 148 static ssize_t
 149 store_scan(struct device *dev, struct device_attribute *attr,
 150            const char *buf, size_t count)
 151 {
 152         struct Scsi_Host *shost = class_to_shost(dev);
 153         int res;
 154
 155         res = scsi_scan(shost, buf);
 156         if (res == 0)
 157                 res = count;
 158         return res;
 159 };
 160 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 161
 162 static ssize_t
 163 store_shost_state(struct device *dev, struct device_attribute *attr,
 164                   const char *buf, size_t count)
 165 {
 166         int i;
 167         struct Scsi_Host *shost = class_to_shost(dev);
 168         enum scsi_host_state state = 0;
 169
 170         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 171                 const int len = strlen(shost_states[i].name);
 172                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 173                    buf[len] == '\n') {
 174                         state = shost_states[i].value;
 175                         break;
 176                 }
 177         }
 178         if (!state)
 179                 return -EINVAL;
 180
 181         if (scsi_host_set_state(shost, state))
 182                 return -EINVAL;
 183         return count;
 184 }
 185
 186 static ssize_t
 187 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 188 {
 189         struct Scsi_Host *shost = class_to_shost(dev);
 190         const char *name = scsi_host_state_name(shost->shost_state);
 191
 192         if (!name)
 193                 return -EINVAL;
 194
 195         return snprintf(buf, 20, "%s\n", name);
 196 }
 197
 198 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 199 struct device_attribute dev_attr_hstate =
 200         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 201
 202 static ssize_t
 203 show_shost_mode(unsigned int mode, char *buf)
 204 {
 205         ssize_t len = 0;
 206
 207         if (mode & MODE_INITIATOR)
 208                 len = sprintf(buf, "%s", "Initiator");
 209
 210         if (mode & MODE_TARGET)
 211                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 212
 213         len += sprintf(buf + len, "\n");
 214
 215         return len;
 216 }
 217
 218 static ssize_t
 219 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 220                           char *buf)
 221 {
 222         struct Scsi_Host *shost = class_to_shost(dev);
 223         unsigned int supported_mode = shost->hostt->supported_mode;
 224
 225         if (supported_mode == MODE_UNKNOWN)
 226                 /* by default this should be initiator */
 227                 supported_mode = MODE_INITIATOR;
 228
 229         return show_shost_mode(supported_mode, buf);
 230 }
 231
 232 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 233
 234 static ssize_t
 235 show_shost_active_mode(struct device *dev,
 236                        struct device_attribute *attr, char *buf)
 237 {
 238         struct Scsi_Host *shost = class_to_shost(dev);
 239
 240         if (shost->active_mode == MODE_UNKNOWN)
 241                 return snprintf(buf, 20, "unknown\n");
 242         else
 243                 return show_shost_mode(shost->active_mode, buf);
 244 }
 245
 246 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 247
 248 shost_rd_attr(unique_id, "%u\n");
 249 shost_rd_attr(host_busy, "%hu\n");
 250 shost_rd_attr(cmd_per_lun, "%hd\n");
 251 shost_rd_attr(can_queue, "%hd\n");
 252 shost_rd_attr(sg_tablesize, "%hu\n");
 253 shost_rd_attr(unchecked_isa_dma, "%d\n");
 254 shost_rd_attr(prot_capabilities, "%u\n");
 255 shost_rd_attr(prot_guard_type, "%hd\n");
 256 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 257
 258 static struct attribute *scsi_sysfs_shost_attrs[] = {
 259         &dev_attr_unique_id.attr,
 260         &dev_attr_host_busy.attr,
 261         &dev_attr_cmd_per_lun.attr,
 262         &dev_attr_can_queue.attr,
 263         &dev_attr_sg_tablesize.attr,
 264         &dev_attr_unchecked_isa_dma.attr,
 265         &dev_attr_proc_name.attr,
 266         &dev_attr_scan.attr,
 267         &dev_attr_hstate.attr,
 268         &dev_attr_supported_mode.attr,
 269         &dev_attr_active_mode.attr,
 270         &dev_attr_prot_capabilities.attr,
 271         &dev_attr_prot_guard_type.attr,
 272         NULL
 273 };
 274
 275 struct attribute_group scsi_shost_attr_group = {
 276         .attrs =        scsi_sysfs_shost_attrs,
 277 };
 278
 279 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 280         &scsi_shost_attr_group,
 281         NULL
 282 };
 283
 284 static void scsi_device_cls_release(struct device *class_dev)
 285 {
 286         struct scsi_device *sdev;
 287
 288         sdev = class_to_sdev(class_dev);
 289         put_device(&sdev->sdev_gendev);
 290 }
 291
 292 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 293 {
 294         struct scsi_device *sdev;
 295         struct device *parent;
 296         struct scsi_target *starget;
 297         struct list_head *this, *tmp;
 298         unsigned long flags;
 299
 300         sdev = container_of(work, struct scsi_device, ew.work);
 301
 302         parent = sdev->sdev_gendev.parent;
 303         starget = to_scsi_target(parent);
 304
 305         spin_lock_irqsave(sdev->host->host_lock, flags);
 306         starget->reap_ref++;
 307         list_del(&sdev->siblings);
 308         list_del(&sdev->same_target_siblings);
 309         list_del(&sdev->starved_entry);
 310         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 311
 312         cancel_work_sync(&sdev->event_work);
 313
 314         list_for_each_safe(this, tmp, &sdev->event_list) {
 315                 struct scsi_event *evt;
 316
 317                 evt = list_entry(this, struct scsi_event, node);
 318                 list_del(&evt->node);
 319                 kfree(evt);
 320         }
 321
 322         if (sdev->request_queue) {
 323                 sdev->request_queue->queuedata = NULL;
 324                 /* user context needed to free queue */
 325                 scsi_free_queue(sdev->request_queue);
 326                 /* temporary expedient, try to catch use of queue lock
 327                  * after free of sdev */
 328                 sdev->request_queue = NULL;
 329         }
 330
 331         scsi_target_reap(scsi_target(sdev));
 332
 333         kfree(sdev->inquiry);
 334         kfree(sdev);
 335
 336         if (parent)
 337                 put_device(parent);
 338 }
 339
 340 static void scsi_device_dev_release(struct device *dev)
 341 {
 342         struct scsi_device *sdp = to_scsi_device(dev);
 343         execute_in_process_context(scsi_device_dev_release_usercontext,
 344                                    &sdp->ew);
 345 }
 346
 347 static struct class sdev_class = {
 348         .name           = "scsi_device",
 349         .dev_release    = scsi_device_cls_release,
 350 };
 351
 352 /* all probing is done in the individual ->probe routines */
 353 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 354 {
 355         struct scsi_device *sdp;
 356
 357         if (dev->type != &scsi_dev_type)
 358                 return 0;
 359
 360         sdp = to_scsi_device(dev);
 361         if (sdp->no_uld_attach)
 362                 return 0;
 363         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 364 }
 365
 366 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 367 {
 368         struct scsi_device *sdev;
 369
 370         if (dev->type != &scsi_dev_type)
 371                 return 0;
 372
 373         sdev = to_scsi_device(dev);
 374
 375         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 376         return 0;
 377 }
 378
 379 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 380 {
 381         struct device_driver *drv;
 382         struct scsi_device *sdev;
 383         int err;
 384
 385         if (dev->type != &scsi_dev_type)
 386                 return 0;
 387
 388         drv = dev->driver;
 389         sdev = to_scsi_device(dev);
 390
 391         err = scsi_device_quiesce(sdev);
 392         if (err)
 393                 return err;
 394
 395         if (drv && drv->suspend) {
 396                 err = drv->suspend(dev, state);
 397                 if (err)
 398                         return err;
 399         }
 400
 401         return 0;
 402 }
 403
 404 static int scsi_bus_resume(struct device * dev)
 405 {
 406         struct device_driver *drv;
 407         struct scsi_device *sdev;
 408         int err = 0;
 409
 410         if (dev->type != &scsi_dev_type)
 411                 return 0;
 412
 413         drv = dev->driver;
 414         sdev = to_scsi_device(dev);
 415
 416         if (drv && drv->resume)
 417                 err = drv->resume(dev);
 418
 419         scsi_device_resume(sdev);
 420
 421         return err;
 422 }
 423
 424 struct bus_type scsi_bus_type = {
 425         .name           = "scsi",
 426         .match          = scsi_bus_match,
 427         .uevent         = scsi_bus_uevent,
 428         .suspend        = scsi_bus_suspend,
 429         .resume         = scsi_bus_resume,
 430 };
 431 EXPORT_SYMBOL_GPL(scsi_bus_type);
 432
 433 int scsi_sysfs_register(void)
 434 {
 435         int error;
 436
 437         error = bus_register(&scsi_bus_type);
 438         if (!error) {
 439                 error = class_register(&sdev_class);
 440                 if (error)
 441                         bus_unregister(&scsi_bus_type);
 442         }
 443
 444         return error;
 445 }
 446
 447 void scsi_sysfs_unregister(void)
 448 {
 449         class_unregister(&sdev_class);
 450         bus_unregister(&scsi_bus_type);
 451 }
 452
 453 /*
 454  * sdev_show_function: macro to create an attr function that can be used to
 455  * show a non-bit field.
 456  */
 457 #define sdev_show_function(field, format_string)                                \
 458 static ssize_t                                                          \
 459 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 460                    char *buf)                                           \
 461 {                                                                       \
 462         struct scsi_device *sdev;                                       \
 463         sdev = to_scsi_device(dev);                                     \
 464         return snprintf (buf, 20, format_string, sdev->field);          \
 465 }                                                                       \
 466
 467 /*
 468  * sdev_rd_attr: macro to create a function and attribute variable for a
 469  * read only field.
 470  */
 471 #define sdev_rd_attr(field, format_string)                              \
 472         sdev_show_function(field, format_string)                        \
 473 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 474
 475
 476 /*
 477  * sdev_rd_attr: create a function and attribute variable for a
 478  * read/write field.
 479  */
 480 #define sdev_rw_attr(field, format_string)                              \
 481         sdev_show_function(field, format_string)                                \
 482                                                                         \
 483 static ssize_t                                                          \
 484 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 485                     const char *buf, size_t count)                      \
 486 {                                                                       \
 487         struct scsi_device *sdev;                                       \
 488         sdev = to_scsi_device(dev);                                     \
 489         snscanf (buf, 20, format_string, &sdev->field);                 \
 490         return count;                                                   \
 491 }                                                                       \
 492 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 493
 494 /* Currently we don't export bit fields, but we might in future,
 495  * so leave this code in */
 496 #if 0
 497 /*
 498  * sdev_rd_attr: create a function and attribute variable for a
 499  * read/write bit field.
 500  */
 501 #define sdev_rw_attr_bit(field)                                         \
 502         sdev_show_function(field, "%d\n")                                       \
 503                                                                         \
 504 static ssize_t                                                          \
 505 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 506                     const char *buf, size_t count)                      \
 507 {                                                                       \
 508         int ret;                                                        \
 509         struct scsi_device *sdev;                                       \
 510         ret = scsi_sdev_check_buf_bit(buf);                             \
 511         if (ret >= 0)   {                                               \
 512                 sdev = to_scsi_device(dev);                             \
 513                 sdev->field = ret;                                      \
 514                 ret = count;                                            \
 515         }                                                               \
 516         return ret;                                                     \
 517 }                                                                       \
 518 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 519
 520 /*
 521  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 522  * else return -EINVAL.
 523  */
 524 static int scsi_sdev_check_buf_bit(const char *buf)
 525 {
 526         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 527                 if (buf[0] == '1')
 528                         return 1;
 529                 else if (buf[0] == '0')
 530                         return 0;
 531                 else
 532                         return -EINVAL;
 533         } else
 534                 return -EINVAL;
 535 }
 536 #endif
 537 /*
 538  * Create the actual show/store functions and data structures.
 539  */
 540 sdev_rd_attr (device_blocked, "%d\n");
 541 sdev_rd_attr (queue_depth, "%d\n");
 542 sdev_rd_attr (type, "%d\n");
 543 sdev_rd_attr (scsi_level, "%d\n");
 544 sdev_rd_attr (vendor, "%.8s\n");
 545 sdev_rd_attr (model, "%.16s\n");
 546 sdev_rd_attr (rev, "%.4s\n");
 547
 548 /*
 549  * TODO: can we make these symlinks to the block layer ones?
 550  */
 551 static ssize_t
 552 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 553 {
 554         struct scsi_device *sdev;
 555         sdev = to_scsi_device(dev);
 556         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 557 }
 558
 559 static ssize_t
 560 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 561                     const char *buf, size_t count)
 562 {
 563         struct scsi_device *sdev;
 564         int timeout;
 565         sdev = to_scsi_device(dev);
 566         sscanf (buf, "%d\n", &timeout);
 567         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 568         return count;
 569 }
 570 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 571
 572 static ssize_t
 573 store_rescan_field (struct device *dev, struct device_attribute *attr,
 574                     const char *buf, size_t count)
 575 {
 576         scsi_rescan_device(dev);
 577         return count;
 578 }
 579 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 580
 581 static void sdev_store_delete_callback(struct device *dev)
 582 {
 583         scsi_remove_device(to_scsi_device(dev));
 584 }
 585
 586 static ssize_t
 587 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 588                   const char *buf, size_t count)
 589 {
 590         int rc;
 591
 592         /* An attribute cannot be unregistered by one of its own methods,
 593          * so we have to use this roundabout approach.
 594          */
 595         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 596         if (rc)
 597                 count = rc;
 598         return count;
 599 };
 600 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 601
 602 static ssize_t
 603 store_state_field(struct device *dev, struct device_attribute *attr,
 604                   const char *buf, size_t count)
 605 {
 606         int i;
 607         struct scsi_device *sdev = to_scsi_device(dev);
 608         enum scsi_device_state state = 0;
 609
 610         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 611                 const int len = strlen(sdev_states[i].name);
 612                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 613                    buf[len] == '\n') {
 614                         state = sdev_states[i].value;
 615                         break;
 616                 }
 617         }
 618         if (!state)
 619                 return -EINVAL;
 620
 621         if (scsi_device_set_state(sdev, state))
 622                 return -EINVAL;
 623         return count;
 624 }
 625
 626 static ssize_t
 627 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 628 {
 629         struct scsi_device *sdev = to_scsi_device(dev);
 630         const char *name = scsi_device_state_name(sdev->sdev_state);
 631
 632         if (!name)
 633                 return -EINVAL;
 634
 635         return snprintf(buf, 20, "%s\n", name);
 636 }
 637
 638 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 639
 640 static ssize_t
 641 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 642                       char *buf)
 643 {
 644         struct scsi_device *sdev = to_scsi_device(dev);
 645         const char *name = "none";
 646
 647         if (sdev->ordered_tags)
 648                 name = "ordered";
 649         else if (sdev->simple_tags)
 650                 name = "simple";
 651
 652         return snprintf(buf, 20, "%s\n", name);
 653 }
 654
 655 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 656
 657 static ssize_t
 658 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 659 {
 660         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 661 }
 662
 663 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 664
 665 #define show_sdev_iostat(field)                                         \
 666 static ssize_t                                                          \
 667 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 668                     char *buf)                                          \
 669 {                                                                       \
 670         struct scsi_device *sdev = to_scsi_device(dev);                 \
 671         unsigned long long count = atomic_read(&sdev->field);           \
 672         return snprintf(buf, 20, "0x%llx\n", count);                    \
 673 }                                                                       \
 674 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 675
 676 show_sdev_iostat(iorequest_cnt);
 677 show_sdev_iostat(iodone_cnt);
 678 show_sdev_iostat(ioerr_cnt);
 679
 680 static ssize_t
 681 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 682 {
 683         struct scsi_device *sdev;
 684         sdev = to_scsi_device(dev);
 685         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 686 }
 687 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 688
 689 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 690 static ssize_t                                                          \
 691 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 692                      char *buf)                                         \
 693 {                                                                       \
 694         struct scsi_device *sdev = to_scsi_device(dev);                 \
 695         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 696         return snprintf(buf, 20, "%d\n", val);                          \
 697 }
 698
 699 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 700 static ssize_t                                                          \
 701 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 702                       const char *buf, size_t count)                    \
 703 {                                                                       \
 704         struct scsi_device *sdev = to_scsi_device(dev);                 \
 705         int val = simple_strtoul(buf, NULL, 0);                         \
 706         if (val == 0)                                                   \
 707                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 708         else if (val == 1)                                              \
 709                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 710         else                                                            \
 711                 return -EINVAL;                                         \
 712         return count;                                                   \
 713 }
 714
 715 #define DECLARE_EVT(name, Cap_name)                                     \
 716         DECLARE_EVT_SHOW(name, Cap_name)                                \
 717         DECLARE_EVT_STORE(name, Cap_name)                               \
 718         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 719                            sdev_store_evt_##name);
 720 #define REF_EVT(name) &dev_attr_evt_##name.attr
 721
 722 DECLARE_EVT(media_change, MEDIA_CHANGE)
 723
 724 /* Default template for device attributes.  May NOT be modified */
 725 static struct attribute *scsi_sdev_attrs[] = {
 726         &dev_attr_device_blocked.attr,
 727         &dev_attr_type.attr,
 728         &dev_attr_scsi_level.attr,
 729         &dev_attr_vendor.attr,
 730         &dev_attr_model.attr,
 731         &dev_attr_rev.attr,
 732         &dev_attr_rescan.attr,
 733         &dev_attr_delete.attr,
 734         &dev_attr_state.attr,
 735         &dev_attr_timeout.attr,
 736         &dev_attr_iocounterbits.attr,
 737         &dev_attr_iorequest_cnt.attr,
 738         &dev_attr_iodone_cnt.attr,
 739         &dev_attr_ioerr_cnt.attr,
 740         &dev_attr_modalias.attr,
 741         REF_EVT(media_change),
 742         NULL
 743 };
 744
 745 static struct attribute_group scsi_sdev_attr_group = {
 746         .attrs =        scsi_sdev_attrs,
 747 };
 748
 749 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 750         &scsi_sdev_attr_group,
 751         NULL
 752 };
 753
 754 static ssize_t
 755 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 756                           const char *buf, size_t count)
 757 {
 758         int depth, retval;
 759         struct scsi_device *sdev = to_scsi_device(dev);
 760         struct scsi_host_template *sht = sdev->host->hostt;
 761
 762         if (!sht->change_queue_depth)
 763                 return -EINVAL;
 764
 765         depth = simple_strtoul(buf, NULL, 0);
 766
 767         if (depth < 1)
 768                 return -EINVAL;
 769
 770         retval = sht->change_queue_depth(sdev, depth,
 771                                          SCSI_QDEPTH_DEFAULT);
 772         if (retval < 0)
 773                 return retval;
 774
 775         sdev->max_queue_depth = sdev->queue_depth;
 776
 777         return count;
 778 }
 779
 780 static struct device_attribute sdev_attr_queue_depth_rw =
 781         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 782                sdev_store_queue_depth_rw);
 783
 784 static ssize_t
 785 sdev_show_queue_ramp_up_period(struct device *dev,
 786                                struct device_attribute *attr,
 787                                char *buf)
 788 {
 789         struct scsi_device *sdev;
 790         sdev = to_scsi_device(dev);
 791         return snprintf(buf, 20, "%u\n",
 792                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 793 }
 794
 795 static ssize_t
 796 sdev_store_queue_ramp_up_period(struct device *dev,
 797                                 struct device_attribute *attr,
 798                                 const char *buf, size_t count)
 799 {
 800         struct scsi_device *sdev = to_scsi_device(dev);
 801         unsigned long period;
 802
 803         if (strict_strtoul(buf, 10, &period))
 804                 return -EINVAL;
 805
 806         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 807         return period;
 808 }
 809
 810 static struct device_attribute sdev_attr_queue_ramp_up_period =
 811         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 812                sdev_show_queue_ramp_up_period,
 813                sdev_store_queue_ramp_up_period);
 814
 815 static ssize_t
 816 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 817                          const char *buf, size_t count)
 818 {
 819         struct scsi_device *sdev = to_scsi_device(dev);
 820         struct scsi_host_template *sht = sdev->host->hostt;
 821         int tag_type = 0, retval;
 822         int prev_tag_type = scsi_get_tag_type(sdev);
 823
 824         if (!sdev->tagged_supported || !sht->change_queue_type)
 825                 return -EINVAL;
 826
 827         if (strncmp(buf, "ordered", 7) == 0)
 828                 tag_type = MSG_ORDERED_TAG;
 829         else if (strncmp(buf, "simple", 6) == 0)
 830                 tag_type = MSG_SIMPLE_TAG;
 831         else if (strncmp(buf, "none", 4) != 0)
 832                 return -EINVAL;
 833
 834         if (tag_type == prev_tag_type)
 835                 return count;
 836
 837         retval = sht->change_queue_type(sdev, tag_type);
 838         if (retval < 0)
 839                 return retval;
 840
 841         return count;
 842 }
 843
 844 static int scsi_target_add(struct scsi_target *starget)
 845 {
 846         int error;
 847
 848         if (starget->state != STARGET_CREATED)
 849                 return 0;
 850
 851         device_enable_async_suspend(&starget->dev);
 852
 853         error = device_add(&starget->dev);
 854         if (error) {
 855                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 856                 get_device(&starget->dev);
 857                 scsi_target_reap(starget);
 858                 put_device(&starget->dev);
 859                 return error;
 860         }
 861         transport_add_device(&starget->dev);
 862         starget->state = STARGET_RUNNING;
 863
 864         return 0;
 865 }
 866
 867 static struct device_attribute sdev_attr_queue_type_rw =
 868         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 869                sdev_store_queue_type_rw);
 870
 871 /**
 872  * scsi_sysfs_add_sdev - add scsi device to sysfs
 873  * @sdev:       scsi_device to add
 874  *
 875  * Return value:
 876  *      0 on Success / non-zero on Failure
 877  **/
 878 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 879 {
 880         int error, i;
 881         struct request_queue *rq = sdev->request_queue;
 882         struct scsi_target *starget = sdev->sdev_target;
 883
 884         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 885         if (error)
 886                 return error;
 887
 888         error = scsi_target_add(starget);
 889         if (error)
 890                 return error;
 891
 892         transport_configure_device(&starget->dev);
 893         device_enable_async_suspend(&sdev->sdev_gendev);
 894         error = device_add(&sdev->sdev_gendev);
 895         if (error) {
 896                 printk(KERN_INFO "error 1\n");
 897                 return error;
 898         }
 899         device_enable_async_suspend(&sdev->sdev_dev);
 900         error = device_add(&sdev->sdev_dev);
 901         if (error) {
 902                 printk(KERN_INFO "error 2\n");
 903                 device_del(&sdev->sdev_gendev);
 904                 return error;
 905         }
 906         transport_add_device(&sdev->sdev_gendev);
 907         sdev->is_visible = 1;
 908
 909         /* create queue files, which may be writable, depending on the host */
 910         if (sdev->host->hostt->change_queue_depth) {
 911                 error = device_create_file(&sdev->sdev_gendev,
 912                                            &sdev_attr_queue_depth_rw);
 913                 error = device_create_file(&sdev->sdev_gendev,
 914                                            &sdev_attr_queue_ramp_up_period);
 915         }
 916         else
 917                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 918         if (error)
 919                 return error;
 920
 921         if (sdev->host->hostt->change_queue_type)
 922                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 923         else
 924                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 925         if (error)
 926                 return error;
 927
 928         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 929
 930         if (error)
 931                 /* we're treating error on bsg register as non-fatal,
 932                  * so pretend nothing went wrong */
 933                 sdev_printk(KERN_INFO, sdev,
 934                             "Failed to register bsg queue, errno=%d\n", error);
 935
 936         /* add additional host specific attributes */
 937         if (sdev->host->hostt->sdev_attrs) {
 938                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 939                         error = device_create_file(&sdev->sdev_gendev,
 940                                         sdev->host->hostt->sdev_attrs[i]);
 941                         if (error)
 942                                 return error;
 943                 }
 944         }
 945
 946         return error;
 947 }
 948
 949 void __scsi_remove_device(struct scsi_device *sdev)
 950 {
 951         struct device *dev = &sdev->sdev_gendev;
 952
 953         if (sdev->is_visible) {
 954                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 955                         return;
 956
 957                 bsg_unregister_queue(sdev->request_queue);
 958                 device_unregister(&sdev->sdev_dev);
 959                 transport_remove_device(dev);
 960                 device_del(dev);
 961         } else
 962                 put_device(&sdev->sdev_dev);
 963         scsi_device_set_state(sdev, SDEV_DEL);
 964         if (sdev->host->hostt->slave_destroy)
 965                 sdev->host->hostt->slave_destroy(sdev);
 966         transport_destroy_device(dev);
 967         put_device(dev);
 968 }
 969
 970 /**
 971  * scsi_remove_device - unregister a device from the scsi bus
 972  * @sdev:       scsi_device to unregister
 973  **/
 974 void scsi_remove_device(struct scsi_device *sdev)
 975 {
 976         struct Scsi_Host *shost = sdev->host;
 977
 978         mutex_lock(&shost->scan_mutex);
 979         __scsi_remove_device(sdev);
 980         mutex_unlock(&shost->scan_mutex);
 981 }
 982 EXPORT_SYMBOL(scsi_remove_device);
 983
 984 static void __scsi_remove_target(struct scsi_target *starget)
 985 {
 986         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 987         unsigned long flags;
 988         struct scsi_device *sdev;
 989
 990         spin_lock_irqsave(shost->host_lock, flags);
 991         starget->reap_ref++;
 992  restart:
 993         list_for_each_entry(sdev, &shost->__devices, siblings) {
 994                 if (sdev->channel != starget->channel ||
 995                     sdev->id != starget->id ||
 996                     sdev->sdev_state == SDEV_DEL)
 997                         continue;
 998                 spin_unlock_irqrestore(shost->host_lock, flags);
 999                 scsi_remove_device(sdev);
1000                 spin_lock_irqsave(shost->host_lock, flags);
1001                 goto restart;
1002         }
1003         spin_unlock_irqrestore(shost->host_lock, flags);
1004         scsi_target_reap(starget);
1005 }
1006
1007 static int __remove_child (struct device * dev, void * data)
1008 {
1009         if (scsi_is_target_device(dev))
1010                 __scsi_remove_target(to_scsi_target(dev));
1011         return 0;
1012 }
1013
1014 /**
1015  * scsi_remove_target - try to remove a target and all its devices
1016  * @dev: generic starget or parent of generic stargets to be removed
1017  *
1018  * Note: This is slightly racy.  It is possible that if the user
1019  * requests the addition of another device then the target won't be
1020  * removed.
1021  */
1022 void scsi_remove_target(struct device *dev)
1023 {
1024         struct device *rdev;
1025
1026         if (scsi_is_target_device(dev)) {
1027                 __scsi_remove_target(to_scsi_target(dev));
1028                 return;
1029         }
1030
1031         rdev = get_device(dev);
1032         device_for_each_child(dev, NULL, __remove_child);
1033         put_device(rdev);
1034 }
1035 EXPORT_SYMBOL(scsi_remove_target);
1036
1037 int scsi_register_driver(struct device_driver *drv)
1038 {
1039         drv->bus = &scsi_bus_type;
1040
1041         return driver_register(drv);
1042 }
1043 EXPORT_SYMBOL(scsi_register_driver);
1044
1045 int scsi_register_interface(struct class_interface *intf)
1046 {
1047         intf->class = &sdev_class;
1048
1049         return class_interface_register(intf);
1050 }
1051 EXPORT_SYMBOL(scsi_register_interface);
1052
1053 /**
1054  * scsi_sysfs_add_host - add scsi host to subsystem
1055  * @shost:     scsi host struct to add to subsystem
1056  **/
1057 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1058 {
1059         int error, i;
1060
1061         /* add host specific attributes */
1062         if (shost->hostt->shost_attrs) {
1063                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1064                         error = device_create_file(&shost->shost_dev,
1065                                         shost->hostt->shost_attrs[i]);
1066                         if (error)
1067                                 return error;
1068                 }
1069         }
1070
1071         transport_register_device(&shost->shost_gendev);
1072         transport_configure_device(&shost->shost_gendev);
1073         return 0;
1074 }
1075
1076 static struct device_type scsi_dev_type = {
1077         .name =         "scsi_device",
1078         .release =      scsi_device_dev_release,
1079         .groups =       scsi_sdev_attr_groups,
1080 };
1081
1082 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1083 {
1084         unsigned long flags;
1085         struct Scsi_Host *shost = sdev->host;
1086         struct scsi_target  *starget = sdev->sdev_target;
1087
1088         device_initialize(&sdev->sdev_gendev);
1089         sdev->sdev_gendev.bus = &scsi_bus_type;
1090         sdev->sdev_gendev.type = &scsi_dev_type;
1091         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1092                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1093
1094         device_initialize(&sdev->sdev_dev);
1095         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1096         sdev->sdev_dev.class = &sdev_class;
1097         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1098                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1099         sdev->scsi_level = starget->scsi_level;
1100         transport_setup_device(&sdev->sdev_gendev);
1101         spin_lock_irqsave(shost->host_lock, flags);
1102         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1103         list_add_tail(&sdev->siblings, &shost->__devices);
1104         spin_unlock_irqrestore(shost->host_lock, flags);
1105 }
1106
1107 int scsi_is_sdev_device(const struct device *dev)
1108 {
1109         return dev->type == &scsi_dev_type;
1110 }
1111 EXPORT_SYMBOL(scsi_is_sdev_device);
1112
1113 /* A blank transport template that is used in drivers that don't
1114  * yet implement Transport Attributes */
1115 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };