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 #include <linux/pm_runtime.h>
  15
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_device.h>
  18 #include <scsi/scsi_host.h>
  19 #include <scsi/scsi_tcq.h>
  20 #include <scsi/scsi_transport.h>
  21 #include <scsi/scsi_driver.h>
  22
  23 #include "scsi_priv.h"
  24 #include "scsi_logging.h"
  25
  26 static struct device_type scsi_dev_type;
  27
  28 static const struct {
  29         enum scsi_device_state  value;
  30         char                    *name;
  31 } sdev_states[] = {
  32         { SDEV_CREATED, "created" },
  33         { SDEV_RUNNING, "running" },
  34         { SDEV_CANCEL, "cancel" },
  35         { SDEV_DEL, "deleted" },
  36         { SDEV_QUIESCE, "quiesce" },
  37         { SDEV_OFFLINE, "offline" },
  38         { SDEV_BLOCK,   "blocked" },
  39         { SDEV_CREATED_BLOCK, "created-blocked" },
  40 };
  41
  42 const char *scsi_device_state_name(enum scsi_device_state state)
  43 {
  44         int i;
  45         char *name = NULL;
  46
  47         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  48                 if (sdev_states[i].value == state) {
  49                         name = sdev_states[i].name;
  50                         break;
  51                 }
  52         }
  53         return name;
  54 }
  55
  56 static const struct {
  57         enum scsi_host_state    value;
  58         char                    *name;
  59 } shost_states[] = {
  60         { SHOST_CREATED, "created" },
  61         { SHOST_RUNNING, "running" },
  62         { SHOST_CANCEL, "cancel" },
  63         { SHOST_DEL, "deleted" },
  64         { SHOST_RECOVERY, "recovery" },
  65         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  66         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  67 };
  68 const char *scsi_host_state_name(enum scsi_host_state state)
  69 {
  70         int i;
  71         char *name = NULL;
  72
  73         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  74                 if (shost_states[i].value == state) {
  75                         name = shost_states[i].name;
  76                         break;
  77                 }
  78         }
  79         return name;
  80 }
  81
  82 static int check_set(unsigned int *val, char *src)
  83 {
  84         char *last;
  85
  86         if (strncmp(src, "-", 20) == 0) {
  87                 *val = SCAN_WILD_CARD;
  88         } else {
  89                 /*
  90                  * Doesn't check for int overflow
  91                  */
  92                 *val = simple_strtoul(src, &last, 0);
  93                 if (*last != '\0')
  94                         return 1;
  95         }
  96         return 0;
  97 }
  98
  99 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 100 {
 101         char s1[15], s2[15], s3[15], junk;
 102         unsigned int channel, id, lun;
 103         int res;
 104
 105         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 106         if (res != 3)
 107                 return -EINVAL;
 108         if (check_set(&channel, s1))
 109                 return -EINVAL;
 110         if (check_set(&id, s2))
 111                 return -EINVAL;
 112         if (check_set(&lun, s3))
 113                 return -EINVAL;
 114         if (shost->transportt->user_scan)
 115                 res = shost->transportt->user_scan(shost, channel, id, lun);
 116         else
 117                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 118         return res;
 119 }
 120
 121 /*
 122  * shost_show_function: macro to create an attr function that can be used to
 123  * show a non-bit field.
 124  */
 125 #define shost_show_function(name, field, format_string)                 \
 126 static ssize_t                                                          \
 127 show_##name (struct device *dev, struct device_attribute *attr,         \
 128              char *buf)                                                 \
 129 {                                                                       \
 130         struct Scsi_Host *shost = class_to_shost(dev);                  \
 131         return snprintf (buf, 20, format_string, shost->field);         \
 132 }
 133
 134 /*
 135  * shost_rd_attr: macro to create a function and attribute variable for a
 136  * read only field.
 137  */
 138 #define shost_rd_attr2(name, field, format_string)                      \
 139         shost_show_function(name, field, format_string)                 \
 140 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 141
 142 #define shost_rd_attr(field, format_string) \
 143 shost_rd_attr2(field, field, format_string)
 144
 145 /*
 146  * Create the actual show/store functions and data structures.
 147  */
 148
 149 static ssize_t
 150 store_scan(struct device *dev, struct device_attribute *attr,
 151            const char *buf, size_t count)
 152 {
 153         struct Scsi_Host *shost = class_to_shost(dev);
 154         int res;
 155
 156         res = scsi_scan(shost, buf);
 157         if (res == 0)
 158                 res = count;
 159         return res;
 160 };
 161 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 162
 163 static ssize_t
 164 store_shost_state(struct device *dev, struct device_attribute *attr,
 165                   const char *buf, size_t count)
 166 {
 167         int i;
 168         struct Scsi_Host *shost = class_to_shost(dev);
 169         enum scsi_host_state state = 0;
 170
 171         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 172                 const int len = strlen(shost_states[i].name);
 173                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 174                    buf[len] == '\n') {
 175                         state = shost_states[i].value;
 176                         break;
 177                 }
 178         }
 179         if (!state)
 180                 return -EINVAL;
 181
 182         if (scsi_host_set_state(shost, state))
 183                 return -EINVAL;
 184         return count;
 185 }
 186
 187 static ssize_t
 188 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 189 {
 190         struct Scsi_Host *shost = class_to_shost(dev);
 191         const char *name = scsi_host_state_name(shost->shost_state);
 192
 193         if (!name)
 194                 return -EINVAL;
 195
 196         return snprintf(buf, 20, "%s\n", name);
 197 }
 198
 199 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 200 struct device_attribute dev_attr_hstate =
 201         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 202
 203 static ssize_t
 204 show_shost_mode(unsigned int mode, char *buf)
 205 {
 206         ssize_t len = 0;
 207
 208         if (mode & MODE_INITIATOR)
 209                 len = sprintf(buf, "%s", "Initiator");
 210
 211         if (mode & MODE_TARGET)
 212                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 213
 214         len += sprintf(buf + len, "\n");
 215
 216         return len;
 217 }
 218
 219 static ssize_t
 220 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 221                           char *buf)
 222 {
 223         struct Scsi_Host *shost = class_to_shost(dev);
 224         unsigned int supported_mode = shost->hostt->supported_mode;
 225
 226         if (supported_mode == MODE_UNKNOWN)
 227                 /* by default this should be initiator */
 228                 supported_mode = MODE_INITIATOR;
 229
 230         return show_shost_mode(supported_mode, buf);
 231 }
 232
 233 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 234
 235 static ssize_t
 236 show_shost_active_mode(struct device *dev,
 237                        struct device_attribute *attr, char *buf)
 238 {
 239         struct Scsi_Host *shost = class_to_shost(dev);
 240
 241         if (shost->active_mode == MODE_UNKNOWN)
 242                 return snprintf(buf, 20, "unknown\n");
 243         else
 244                 return show_shost_mode(shost->active_mode, buf);
 245 }
 246
 247 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 248
 249 static int check_reset_type(const char *str)
 250 {
 251         if (sysfs_streq(str, "adapter"))
 252                 return SCSI_ADAPTER_RESET;
 253         else if (sysfs_streq(str, "firmware"))
 254                 return SCSI_FIRMWARE_RESET;
 255         else
 256                 return 0;
 257 }
 258
 259 static ssize_t
 260 store_host_reset(struct device *dev, struct device_attribute *attr,
 261                 const char *buf, size_t count)
 262 {
 263         struct Scsi_Host *shost = class_to_shost(dev);
 264         struct scsi_host_template *sht = shost->hostt;
 265         int ret = -EINVAL;
 266         int type;
 267
 268         type = check_reset_type(buf);
 269         if (!type)
 270                 goto exit_store_host_reset;
 271
 272         if (sht->host_reset)
 273                 ret = sht->host_reset(shost, type);
 274
 275 exit_store_host_reset:
 276         if (ret == 0)
 277                 ret = count;
 278         return ret;
 279 }
 280
 281 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 282
 283 shost_rd_attr(unique_id, "%u\n");
 284 shost_rd_attr(host_busy, "%hu\n");
 285 shost_rd_attr(cmd_per_lun, "%hd\n");
 286 shost_rd_attr(can_queue, "%hd\n");
 287 shost_rd_attr(sg_tablesize, "%hu\n");
 288 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 289 shost_rd_attr(unchecked_isa_dma, "%d\n");
 290 shost_rd_attr(prot_capabilities, "%u\n");
 291 shost_rd_attr(prot_guard_type, "%hd\n");
 292 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 293
 294 static struct attribute *scsi_sysfs_shost_attrs[] = {
 295         &dev_attr_unique_id.attr,
 296         &dev_attr_host_busy.attr,
 297         &dev_attr_cmd_per_lun.attr,
 298         &dev_attr_can_queue.attr,
 299         &dev_attr_sg_tablesize.attr,
 300         &dev_attr_sg_prot_tablesize.attr,
 301         &dev_attr_unchecked_isa_dma.attr,
 302         &dev_attr_proc_name.attr,
 303         &dev_attr_scan.attr,
 304         &dev_attr_hstate.attr,
 305         &dev_attr_supported_mode.attr,
 306         &dev_attr_active_mode.attr,
 307         &dev_attr_prot_capabilities.attr,
 308         &dev_attr_prot_guard_type.attr,
 309         &dev_attr_host_reset.attr,
 310         NULL
 311 };
 312
 313 struct attribute_group scsi_shost_attr_group = {
 314         .attrs =        scsi_sysfs_shost_attrs,
 315 };
 316
 317 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 318         &scsi_shost_attr_group,
 319         NULL
 320 };
 321
 322 static void scsi_device_cls_release(struct device *class_dev)
 323 {
 324         struct scsi_device *sdev;
 325
 326         sdev = class_to_sdev(class_dev);
 327         put_device(&sdev->sdev_gendev);
 328 }
 329
 330 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 331 {
 332         struct scsi_device *sdev;
 333         struct device *parent;
 334         struct scsi_target *starget;
 335         struct list_head *this, *tmp;
 336         unsigned long flags;
 337
 338         sdev = container_of(work, struct scsi_device, ew.work);
 339
 340         parent = sdev->sdev_gendev.parent;
 341         starget = to_scsi_target(parent);
 342
 343         spin_lock_irqsave(sdev->host->host_lock, flags);
 344         starget->reap_ref++;
 345         list_del(&sdev->siblings);
 346         list_del(&sdev->same_target_siblings);
 347         list_del(&sdev->starved_entry);
 348         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 349
 350         cancel_work_sync(&sdev->event_work);
 351
 352         list_for_each_safe(this, tmp, &sdev->event_list) {
 353                 struct scsi_event *evt;
 354
 355                 evt = list_entry(this, struct scsi_event, node);
 356                 list_del(&evt->node);
 357                 kfree(evt);
 358         }
 359
 360         blk_put_queue(sdev->request_queue);
 361         /* NULL queue means the device can't be used */
 362         sdev->request_queue = NULL;
 363
 364         scsi_target_reap(scsi_target(sdev));
 365
 366         kfree(sdev->inquiry);
 367         kfree(sdev);
 368
 369         if (parent)
 370                 put_device(parent);
 371 }
 372
 373 static void scsi_device_dev_release(struct device *dev)
 374 {
 375         struct scsi_device *sdp = to_scsi_device(dev);
 376         execute_in_process_context(scsi_device_dev_release_usercontext,
 377                                    &sdp->ew);
 378 }
 379
 380 static struct class sdev_class = {
 381         .name           = "scsi_device",
 382         .dev_release    = scsi_device_cls_release,
 383 };
 384
 385 /* all probing is done in the individual ->probe routines */
 386 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 387 {
 388         struct scsi_device *sdp;
 389
 390         if (dev->type != &scsi_dev_type)
 391                 return 0;
 392
 393         sdp = to_scsi_device(dev);
 394         if (sdp->no_uld_attach)
 395                 return 0;
 396         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 397 }
 398
 399 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 400 {
 401         struct scsi_device *sdev;
 402
 403         if (dev->type != &scsi_dev_type)
 404                 return 0;
 405
 406         sdev = to_scsi_device(dev);
 407
 408         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 409         return 0;
 410 }
 411
 412 struct bus_type scsi_bus_type = {
 413         .name           = "scsi",
 414         .match          = scsi_bus_match,
 415         .uevent         = scsi_bus_uevent,
 416 #ifdef CONFIG_PM
 417         .pm             = &scsi_bus_pm_ops,
 418 #endif
 419 };
 420 EXPORT_SYMBOL_GPL(scsi_bus_type);
 421
 422 int scsi_sysfs_register(void)
 423 {
 424         int error;
 425
 426         error = bus_register(&scsi_bus_type);
 427         if (!error) {
 428                 error = class_register(&sdev_class);
 429                 if (error)
 430                         bus_unregister(&scsi_bus_type);
 431         }
 432
 433         return error;
 434 }
 435
 436 void scsi_sysfs_unregister(void)
 437 {
 438         class_unregister(&sdev_class);
 439         bus_unregister(&scsi_bus_type);
 440 }
 441
 442 /*
 443  * sdev_show_function: macro to create an attr function that can be used to
 444  * show a non-bit field.
 445  */
 446 #define sdev_show_function(field, format_string)                                \
 447 static ssize_t                                                          \
 448 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 449                    char *buf)                                           \
 450 {                                                                       \
 451         struct scsi_device *sdev;                                       \
 452         sdev = to_scsi_device(dev);                                     \
 453         return snprintf (buf, 20, format_string, sdev->field);          \
 454 }                                                                       \
 455
 456 /*
 457  * sdev_rd_attr: macro to create a function and attribute variable for a
 458  * read only field.
 459  */
 460 #define sdev_rd_attr(field, format_string)                              \
 461         sdev_show_function(field, format_string)                        \
 462 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 463
 464
 465 /*
 466  * sdev_rw_attr: create a function and attribute variable for a
 467  * read/write field.
 468  */
 469 #define sdev_rw_attr(field, format_string)                              \
 470         sdev_show_function(field, format_string)                                \
 471                                                                         \
 472 static ssize_t                                                          \
 473 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 474                     const char *buf, size_t count)                      \
 475 {                                                                       \
 476         struct scsi_device *sdev;                                       \
 477         sdev = to_scsi_device(dev);                                     \
 478         sscanf (buf, format_string, &sdev->field);                      \
 479         return count;                                                   \
 480 }                                                                       \
 481 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 482
 483 /* Currently we don't export bit fields, but we might in future,
 484  * so leave this code in */
 485 #if 0
 486 /*
 487  * sdev_rd_attr: create a function and attribute variable for a
 488  * read/write bit field.
 489  */
 490 #define sdev_rw_attr_bit(field)                                         \
 491         sdev_show_function(field, "%d\n")                                       \
 492                                                                         \
 493 static ssize_t                                                          \
 494 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 495                     const char *buf, size_t count)                      \
 496 {                                                                       \
 497         int ret;                                                        \
 498         struct scsi_device *sdev;                                       \
 499         ret = scsi_sdev_check_buf_bit(buf);                             \
 500         if (ret >= 0)   {                                               \
 501                 sdev = to_scsi_device(dev);                             \
 502                 sdev->field = ret;                                      \
 503                 ret = count;                                            \
 504         }                                                               \
 505         return ret;                                                     \
 506 }                                                                       \
 507 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 508
 509 /*
 510  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 511  * else return -EINVAL.
 512  */
 513 static int scsi_sdev_check_buf_bit(const char *buf)
 514 {
 515         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 516                 if (buf[0] == '1')
 517                         return 1;
 518                 else if (buf[0] == '0')
 519                         return 0;
 520                 else
 521                         return -EINVAL;
 522         } else
 523                 return -EINVAL;
 524 }
 525 #endif
 526 /*
 527  * Create the actual show/store functions and data structures.
 528  */
 529 sdev_rd_attr (device_blocked, "%d\n");
 530 sdev_rd_attr (queue_depth, "%d\n");
 531 sdev_rd_attr (type, "%d\n");
 532 sdev_rd_attr (scsi_level, "%d\n");
 533 sdev_rd_attr (vendor, "%.8s\n");
 534 sdev_rd_attr (model, "%.16s\n");
 535 sdev_rd_attr (rev, "%.4s\n");
 536
 537 /*
 538  * TODO: can we make these symlinks to the block layer ones?
 539  */
 540 static ssize_t
 541 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 542 {
 543         struct scsi_device *sdev;
 544         sdev = to_scsi_device(dev);
 545         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 546 }
 547
 548 static ssize_t
 549 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 550                     const char *buf, size_t count)
 551 {
 552         struct scsi_device *sdev;
 553         int timeout;
 554         sdev = to_scsi_device(dev);
 555         sscanf (buf, "%d\n", &timeout);
 556         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 557         return count;
 558 }
 559 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 560
 561 static ssize_t
 562 store_rescan_field (struct device *dev, struct device_attribute *attr,
 563                     const char *buf, size_t count)
 564 {
 565         scsi_rescan_device(dev);
 566         return count;
 567 }
 568 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 569
 570 static void sdev_store_delete_callback(struct device *dev)
 571 {
 572         scsi_remove_device(to_scsi_device(dev));
 573 }
 574
 575 static ssize_t
 576 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 577                   const char *buf, size_t count)
 578 {
 579         int rc;
 580
 581         /* An attribute cannot be unregistered by one of its own methods,
 582          * so we have to use this roundabout approach.
 583          */
 584         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 585         if (rc)
 586                 count = rc;
 587         return count;
 588 };
 589 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 590
 591 static ssize_t
 592 store_state_field(struct device *dev, struct device_attribute *attr,
 593                   const char *buf, size_t count)
 594 {
 595         int i;
 596         struct scsi_device *sdev = to_scsi_device(dev);
 597         enum scsi_device_state state = 0;
 598
 599         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 600                 const int len = strlen(sdev_states[i].name);
 601                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 602                    buf[len] == '\n') {
 603                         state = sdev_states[i].value;
 604                         break;
 605                 }
 606         }
 607         if (!state)
 608                 return -EINVAL;
 609
 610         if (scsi_device_set_state(sdev, state))
 611                 return -EINVAL;
 612         return count;
 613 }
 614
 615 static ssize_t
 616 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 617 {
 618         struct scsi_device *sdev = to_scsi_device(dev);
 619         const char *name = scsi_device_state_name(sdev->sdev_state);
 620
 621         if (!name)
 622                 return -EINVAL;
 623
 624         return snprintf(buf, 20, "%s\n", name);
 625 }
 626
 627 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 628
 629 static ssize_t
 630 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 631                       char *buf)
 632 {
 633         struct scsi_device *sdev = to_scsi_device(dev);
 634         const char *name = "none";
 635
 636         if (sdev->ordered_tags)
 637                 name = "ordered";
 638         else if (sdev->simple_tags)
 639                 name = "simple";
 640
 641         return snprintf(buf, 20, "%s\n", name);
 642 }
 643
 644 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 645
 646 static ssize_t
 647 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 648 {
 649         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 650 }
 651
 652 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 653
 654 #define show_sdev_iostat(field)                                         \
 655 static ssize_t                                                          \
 656 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 657                     char *buf)                                          \
 658 {                                                                       \
 659         struct scsi_device *sdev = to_scsi_device(dev);                 \
 660         unsigned long long count = atomic_read(&sdev->field);           \
 661         return snprintf(buf, 20, "0x%llx\n", count);                    \
 662 }                                                                       \
 663 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 664
 665 show_sdev_iostat(iorequest_cnt);
 666 show_sdev_iostat(iodone_cnt);
 667 show_sdev_iostat(ioerr_cnt);
 668
 669 static ssize_t
 670 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 671 {
 672         struct scsi_device *sdev;
 673         sdev = to_scsi_device(dev);
 674         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 675 }
 676 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 677
 678 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 679 static ssize_t                                                          \
 680 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 681                      char *buf)                                         \
 682 {                                                                       \
 683         struct scsi_device *sdev = to_scsi_device(dev);                 \
 684         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 685         return snprintf(buf, 20, "%d\n", val);                          \
 686 }
 687
 688 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 689 static ssize_t                                                          \
 690 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 691                       const char *buf, size_t count)                    \
 692 {                                                                       \
 693         struct scsi_device *sdev = to_scsi_device(dev);                 \
 694         int val = simple_strtoul(buf, NULL, 0);                         \
 695         if (val == 0)                                                   \
 696                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 697         else if (val == 1)                                              \
 698                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 699         else                                                            \
 700                 return -EINVAL;                                         \
 701         return count;                                                   \
 702 }
 703
 704 #define DECLARE_EVT(name, Cap_name)                                     \
 705         DECLARE_EVT_SHOW(name, Cap_name)                                \
 706         DECLARE_EVT_STORE(name, Cap_name)                               \
 707         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 708                            sdev_store_evt_##name);
 709 #define REF_EVT(name) &dev_attr_evt_##name.attr
 710
 711 DECLARE_EVT(media_change, MEDIA_CHANGE)
 712
 713 /* Default template for device attributes.  May NOT be modified */
 714 static struct attribute *scsi_sdev_attrs[] = {
 715         &dev_attr_device_blocked.attr,
 716         &dev_attr_type.attr,
 717         &dev_attr_scsi_level.attr,
 718         &dev_attr_vendor.attr,
 719         &dev_attr_model.attr,
 720         &dev_attr_rev.attr,
 721         &dev_attr_rescan.attr,
 722         &dev_attr_delete.attr,
 723         &dev_attr_state.attr,
 724         &dev_attr_timeout.attr,
 725         &dev_attr_iocounterbits.attr,
 726         &dev_attr_iorequest_cnt.attr,
 727         &dev_attr_iodone_cnt.attr,
 728         &dev_attr_ioerr_cnt.attr,
 729         &dev_attr_modalias.attr,
 730         REF_EVT(media_change),
 731         NULL
 732 };
 733
 734 static struct attribute_group scsi_sdev_attr_group = {
 735         .attrs =        scsi_sdev_attrs,
 736 };
 737
 738 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 739         &scsi_sdev_attr_group,
 740         NULL
 741 };
 742
 743 static ssize_t
 744 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 745                           const char *buf, size_t count)
 746 {
 747         int depth, retval;
 748         struct scsi_device *sdev = to_scsi_device(dev);
 749         struct scsi_host_template *sht = sdev->host->hostt;
 750
 751         if (!sht->change_queue_depth)
 752                 return -EINVAL;
 753
 754         depth = simple_strtoul(buf, NULL, 0);
 755
 756         if (depth < 1)
 757                 return -EINVAL;
 758
 759         retval = sht->change_queue_depth(sdev, depth,
 760                                          SCSI_QDEPTH_DEFAULT);
 761         if (retval < 0)
 762                 return retval;
 763
 764         sdev->max_queue_depth = sdev->queue_depth;
 765
 766         return count;
 767 }
 768
 769 static struct device_attribute sdev_attr_queue_depth_rw =
 770         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 771                sdev_store_queue_depth_rw);
 772
 773 static ssize_t
 774 sdev_show_queue_ramp_up_period(struct device *dev,
 775                                struct device_attribute *attr,
 776                                char *buf)
 777 {
 778         struct scsi_device *sdev;
 779         sdev = to_scsi_device(dev);
 780         return snprintf(buf, 20, "%u\n",
 781                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 782 }
 783
 784 static ssize_t
 785 sdev_store_queue_ramp_up_period(struct device *dev,
 786                                 struct device_attribute *attr,
 787                                 const char *buf, size_t count)
 788 {
 789         struct scsi_device *sdev = to_scsi_device(dev);
 790         unsigned long period;
 791
 792         if (strict_strtoul(buf, 10, &period))
 793                 return -EINVAL;
 794
 795         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 796         return period;
 797 }
 798
 799 static struct device_attribute sdev_attr_queue_ramp_up_period =
 800         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 801                sdev_show_queue_ramp_up_period,
 802                sdev_store_queue_ramp_up_period);
 803
 804 static ssize_t
 805 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 806                          const char *buf, size_t count)
 807 {
 808         struct scsi_device *sdev = to_scsi_device(dev);
 809         struct scsi_host_template *sht = sdev->host->hostt;
 810         int tag_type = 0, retval;
 811         int prev_tag_type = scsi_get_tag_type(sdev);
 812
 813         if (!sdev->tagged_supported || !sht->change_queue_type)
 814                 return -EINVAL;
 815
 816         if (strncmp(buf, "ordered", 7) == 0)
 817                 tag_type = MSG_ORDERED_TAG;
 818         else if (strncmp(buf, "simple", 6) == 0)
 819                 tag_type = MSG_SIMPLE_TAG;
 820         else if (strncmp(buf, "none", 4) != 0)
 821                 return -EINVAL;
 822
 823         if (tag_type == prev_tag_type)
 824                 return count;
 825
 826         retval = sht->change_queue_type(sdev, tag_type);
 827         if (retval < 0)
 828                 return retval;
 829
 830         return count;
 831 }
 832
 833 static int scsi_target_add(struct scsi_target *starget)
 834 {
 835         int error;
 836
 837         if (starget->state != STARGET_CREATED)
 838                 return 0;
 839
 840         error = device_add(&starget->dev);
 841         if (error) {
 842                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 843                 return error;
 844         }
 845         transport_add_device(&starget->dev);
 846         starget->state = STARGET_RUNNING;
 847
 848         pm_runtime_set_active(&starget->dev);
 849         pm_runtime_enable(&starget->dev);
 850         device_enable_async_suspend(&starget->dev);
 851
 852         return 0;
 853 }
 854
 855 static struct device_attribute sdev_attr_queue_type_rw =
 856         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 857                sdev_store_queue_type_rw);
 858
 859 /**
 860  * scsi_sysfs_add_sdev - add scsi device to sysfs
 861  * @sdev:       scsi_device to add
 862  *
 863  * Return value:
 864  *      0 on Success / non-zero on Failure
 865  **/
 866 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 867 {
 868         int error, i;
 869         struct request_queue *rq = sdev->request_queue;
 870         struct scsi_target *starget = sdev->sdev_target;
 871
 872         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 873         if (error)
 874                 return error;
 875
 876         error = scsi_target_add(starget);
 877         if (error)
 878                 return error;
 879
 880         transport_configure_device(&starget->dev);
 881
 882         device_enable_async_suspend(&sdev->sdev_gendev);
 883         scsi_autopm_get_target(starget);
 884         pm_runtime_set_active(&sdev->sdev_gendev);
 885         pm_runtime_forbid(&sdev->sdev_gendev);
 886         pm_runtime_enable(&sdev->sdev_gendev);
 887         scsi_autopm_put_target(starget);
 888
 889         /* The following call will keep sdev active indefinitely, until
 890          * its driver does a corresponding scsi_autopm_pm_device().  Only
 891          * drivers supporting autosuspend will do this.
 892          */
 893         scsi_autopm_get_device(sdev);
 894
 895         error = device_add(&sdev->sdev_gendev);
 896         if (error) {
 897                 sdev_printk(KERN_INFO, sdev,
 898                                 "failed to add device: %d\n", error);
 899                 return error;
 900         }
 901         device_enable_async_suspend(&sdev->sdev_dev);
 902         error = device_add(&sdev->sdev_dev);
 903         if (error) {
 904                 sdev_printk(KERN_INFO, sdev,
 905                                 "failed to add class device: %d\n", error);
 906                 device_del(&sdev->sdev_gendev);
 907                 return error;
 908         }
 909         transport_add_device(&sdev->sdev_gendev);
 910         sdev->is_visible = 1;
 911
 912         /* create queue files, which may be writable, depending on the host */
 913         if (sdev->host->hostt->change_queue_depth) {
 914                 error = device_create_file(&sdev->sdev_gendev,
 915                                            &sdev_attr_queue_depth_rw);
 916                 error = device_create_file(&sdev->sdev_gendev,
 917                                            &sdev_attr_queue_ramp_up_period);
 918         }
 919         else
 920                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 921         if (error)
 922                 return error;
 923
 924         if (sdev->host->hostt->change_queue_type)
 925                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 926         else
 927                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 928         if (error)
 929                 return error;
 930
 931         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 932
 933         if (error)
 934                 /* we're treating error on bsg register as non-fatal,
 935                  * so pretend nothing went wrong */
 936                 sdev_printk(KERN_INFO, sdev,
 937                             "Failed to register bsg queue, errno=%d\n", error);
 938
 939         /* add additional host specific attributes */
 940         if (sdev->host->hostt->sdev_attrs) {
 941                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 942                         error = device_create_file(&sdev->sdev_gendev,
 943                                         sdev->host->hostt->sdev_attrs[i]);
 944                         if (error)
 945                                 return error;
 946                 }
 947         }
 948
 949         return error;
 950 }
 951
 952 void __scsi_remove_device(struct scsi_device *sdev)
 953 {
 954         struct device *dev = &sdev->sdev_gendev;
 955
 956         if (sdev->is_visible) {
 957                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 958                         return;
 959
 960                 bsg_unregister_queue(sdev->request_queue);
 961                 device_unregister(&sdev->sdev_dev);
 962                 transport_remove_device(dev);
 963                 device_del(dev);
 964         } else
 965                 put_device(&sdev->sdev_dev);
 966         scsi_device_set_state(sdev, SDEV_DEL);
 967         if (sdev->host->hostt->slave_destroy)
 968                 sdev->host->hostt->slave_destroy(sdev);
 969         transport_destroy_device(dev);
 970
 971         /* Freeing the queue signals to block that we're done */
 972         blk_cleanup_queue(sdev->request_queue);
 973         put_device(dev);
 974 }
 975
 976 /**
 977  * scsi_remove_device - unregister a device from the scsi bus
 978  * @sdev:       scsi_device to unregister
 979  **/
 980 void scsi_remove_device(struct scsi_device *sdev)
 981 {
 982         struct Scsi_Host *shost = sdev->host;
 983
 984         mutex_lock(&shost->scan_mutex);
 985         __scsi_remove_device(sdev);
 986         mutex_unlock(&shost->scan_mutex);
 987 }
 988 EXPORT_SYMBOL(scsi_remove_device);
 989
 990 static void __scsi_remove_target(struct scsi_target *starget)
 991 {
 992         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 993         unsigned long flags;
 994         struct scsi_device *sdev;
 995
 996         spin_lock_irqsave(shost->host_lock, flags);
 997  restart:
 998         list_for_each_entry(sdev, &shost->__devices, siblings) {
 999                 if (sdev->channel != starget->channel ||
1000                     sdev->id != starget->id ||
1001                     scsi_device_get(sdev))
1002                         continue;
1003                 spin_unlock_irqrestore(shost->host_lock, flags);
1004                 scsi_remove_device(sdev);
1005                 scsi_device_put(sdev);
1006                 spin_lock_irqsave(shost->host_lock, flags);
1007                 goto restart;
1008         }
1009         spin_unlock_irqrestore(shost->host_lock, flags);
1010 }
1011
1012 /**
1013  * scsi_remove_target - try to remove a target and all its devices
1014  * @dev: generic starget or parent of generic stargets to be removed
1015  *
1016  * Note: This is slightly racy.  It is possible that if the user
1017  * requests the addition of another device then the target won't be
1018  * removed.
1019  */
1020 void scsi_remove_target(struct device *dev)
1021 {
1022         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1023         struct scsi_target *starget, *last = NULL;
1024         unsigned long flags;
1025
1026         /* remove targets being careful to lookup next entry before
1027          * deleting the last
1028          */
1029         spin_lock_irqsave(shost->host_lock, flags);
1030         list_for_each_entry(starget, &shost->__targets, siblings) {
1031                 if (starget->state == STARGET_DEL)
1032                         continue;
1033                 if (starget->dev.parent == dev || &starget->dev == dev) {
1034                         /* assuming new targets arrive at the end */
1035                         starget->reap_ref++;
1036                         spin_unlock_irqrestore(shost->host_lock, flags);
1037                         if (last)
1038                                 scsi_target_reap(last);
1039                         last = starget;
1040                         __scsi_remove_target(starget);
1041                         spin_lock_irqsave(shost->host_lock, flags);
1042                 }
1043         }
1044         spin_unlock_irqrestore(shost->host_lock, flags);
1045
1046         if (last)
1047                 scsi_target_reap(last);
1048 }
1049 EXPORT_SYMBOL(scsi_remove_target);
1050
1051 int scsi_register_driver(struct device_driver *drv)
1052 {
1053         drv->bus = &scsi_bus_type;
1054
1055         return driver_register(drv);
1056 }
1057 EXPORT_SYMBOL(scsi_register_driver);
1058
1059 int scsi_register_interface(struct class_interface *intf)
1060 {
1061         intf->class = &sdev_class;
1062
1063         return class_interface_register(intf);
1064 }
1065 EXPORT_SYMBOL(scsi_register_interface);
1066
1067 /**
1068  * scsi_sysfs_add_host - add scsi host to subsystem
1069  * @shost:     scsi host struct to add to subsystem
1070  **/
1071 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1072 {
1073         int error, i;
1074
1075         /* add host specific attributes */
1076         if (shost->hostt->shost_attrs) {
1077                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1078                         error = device_create_file(&shost->shost_dev,
1079                                         shost->hostt->shost_attrs[i]);
1080                         if (error)
1081                                 return error;
1082                 }
1083         }
1084
1085         transport_register_device(&shost->shost_gendev);
1086         transport_configure_device(&shost->shost_gendev);
1087         return 0;
1088 }
1089
1090 static struct device_type scsi_dev_type = {
1091         .name =         "scsi_device",
1092         .release =      scsi_device_dev_release,
1093         .groups =       scsi_sdev_attr_groups,
1094 };
1095
1096 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1097 {
1098         unsigned long flags;
1099         struct Scsi_Host *shost = sdev->host;
1100         struct scsi_target  *starget = sdev->sdev_target;
1101
1102         device_initialize(&sdev->sdev_gendev);
1103         sdev->sdev_gendev.bus = &scsi_bus_type;
1104         sdev->sdev_gendev.type = &scsi_dev_type;
1105         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1106                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1107
1108         device_initialize(&sdev->sdev_dev);
1109         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1110         sdev->sdev_dev.class = &sdev_class;
1111         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1112                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1113         sdev->scsi_level = starget->scsi_level;
1114         transport_setup_device(&sdev->sdev_gendev);
1115         spin_lock_irqsave(shost->host_lock, flags);
1116         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1117         list_add_tail(&sdev->siblings, &shost->__devices);
1118         spin_unlock_irqrestore(shost->host_lock, flags);
1119 }
1120
1121 int scsi_is_sdev_device(const struct device *dev)
1122 {
1123         return dev->type == &scsi_dev_type;
1124 }
1125 EXPORT_SYMBOL(scsi_is_sdev_device);
1126
1127 /* A blank transport template that is used in drivers that don't
1128  * yet implement Transport Attributes */
1129 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };