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/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
  24 static 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
  37 const 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
  51 static 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 };
  63 const 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
  77 static 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
  94 static 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)                 \
 121 static ssize_t                                                          \
 122 show_##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)                 \
 134 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 135
 136 #define shost_rd_attr(field, format_string) \
 137 shost_rd_attr2(field, field, format_string)
 138
 139 /*
 140  * Create the actual show/store functions and data structures.
 141  */
 142
 143 static 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 };
 154 static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 155
 156 static ssize_t
 157 store_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
 179 static ssize_t
 180 show_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
 191 static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 192
 193 static ssize_t
 194 show_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
 209 static 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         unsigned int supported_mode = shost->hostt->supported_mode;
 213
 214         if (supported_mode == MODE_UNKNOWN)
 215                 /* by default this should be initiator */
 216                 supported_mode = MODE_INITIATOR;
 217
 218         return show_shost_mode(supported_mode, buf);
 219 }
 220
 221 static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 222
 223 static ssize_t show_shost_active_mode(struct class_device *class_dev, char *buf)
 224 {
 225         struct Scsi_Host *shost = class_to_shost(class_dev);
 226
 227         if (shost->active_mode == MODE_UNKNOWN)
 228                 return snprintf(buf, 20, "unknown\n");
 229         else
 230                 return show_shost_mode(shost->active_mode, buf);
 231 }
 232
 233 static CLASS_DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 234
 235 shost_rd_attr(unique_id, "%u\n");
 236 shost_rd_attr(host_busy, "%hu\n");
 237 shost_rd_attr(cmd_per_lun, "%hd\n");
 238 shost_rd_attr(can_queue, "%hd\n");
 239 shost_rd_attr(sg_tablesize, "%hu\n");
 240 shost_rd_attr(unchecked_isa_dma, "%d\n");
 241 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 242
 243 static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
 244         &class_device_attr_unique_id,
 245         &class_device_attr_host_busy,
 246         &class_device_attr_cmd_per_lun,
 247         &class_device_attr_can_queue,
 248         &class_device_attr_sg_tablesize,
 249         &class_device_attr_unchecked_isa_dma,
 250         &class_device_attr_proc_name,
 251         &class_device_attr_scan,
 252         &class_device_attr_state,
 253         &class_device_attr_supported_mode,
 254         &class_device_attr_active_mode,
 255         NULL
 256 };
 257
 258 static void scsi_device_cls_release(struct class_device *class_dev)
 259 {
 260         struct scsi_device *sdev;
 261
 262         sdev = class_to_sdev(class_dev);
 263         put_device(&sdev->sdev_gendev);
 264 }
 265
 266 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 267 {
 268         struct scsi_device *sdev;
 269         struct device *parent;
 270         struct scsi_target *starget;
 271         struct list_head *this, *tmp;
 272         unsigned long flags;
 273
 274         sdev = container_of(work, struct scsi_device, ew.work);
 275
 276         parent = sdev->sdev_gendev.parent;
 277         starget = to_scsi_target(parent);
 278
 279         spin_lock_irqsave(sdev->host->host_lock, flags);
 280         starget->reap_ref++;
 281         list_del(&sdev->siblings);
 282         list_del(&sdev->same_target_siblings);
 283         list_del(&sdev->starved_entry);
 284         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 285
 286         cancel_work_sync(&sdev->event_work);
 287
 288         list_for_each_safe(this, tmp, &sdev->event_list) {
 289                 struct scsi_event *evt;
 290
 291                 evt = list_entry(this, struct scsi_event, node);
 292                 list_del(&evt->node);
 293                 kfree(evt);
 294         }
 295
 296         if (sdev->request_queue) {
 297                 sdev->request_queue->queuedata = NULL;
 298                 /* user context needed to free queue */
 299                 scsi_free_queue(sdev->request_queue);
 300                 /* temporary expedient, try to catch use of queue lock
 301                  * after free of sdev */
 302                 sdev->request_queue = NULL;
 303         }
 304
 305         scsi_target_reap(scsi_target(sdev));
 306
 307         kfree(sdev->inquiry);
 308         kfree(sdev);
 309
 310         if (parent)
 311                 put_device(parent);
 312 }
 313
 314 static void scsi_device_dev_release(struct device *dev)
 315 {
 316         struct scsi_device *sdp = to_scsi_device(dev);
 317         execute_in_process_context(scsi_device_dev_release_usercontext,
 318                                    &sdp->ew);
 319 }
 320
 321 static struct class sdev_class = {
 322         .name           = "scsi_device",
 323         .release        = scsi_device_cls_release,
 324 };
 325
 326 /* all probing is done in the individual ->probe routines */
 327 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 328 {
 329         struct scsi_device *sdp = to_scsi_device(dev);
 330         if (sdp->no_uld_attach)
 331                 return 0;
 332         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 333 }
 334
 335 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 336 {
 337         struct scsi_device *sdev = to_scsi_device(dev);
 338
 339         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 340         return 0;
 341 }
 342
 343 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 344 {
 345         struct device_driver *drv = dev->driver;
 346         struct scsi_device *sdev = to_scsi_device(dev);
 347         int err;
 348
 349         err = scsi_device_quiesce(sdev);
 350         if (err)
 351                 return err;
 352
 353         if (drv && drv->suspend) {
 354                 err = drv->suspend(dev, state);
 355                 if (err)
 356                         return err;
 357         }
 358
 359         return 0;
 360 }
 361
 362 static int scsi_bus_resume(struct device * dev)
 363 {
 364         struct device_driver *drv = dev->driver;
 365         struct scsi_device *sdev = to_scsi_device(dev);
 366         int err = 0;
 367
 368         if (drv && drv->resume)
 369                 err = drv->resume(dev);
 370
 371         scsi_device_resume(sdev);
 372
 373         return err;
 374 }
 375
 376 static int scsi_bus_remove(struct device *dev)
 377 {
 378         struct device_driver *drv = dev->driver;
 379         struct scsi_device *sdev = to_scsi_device(dev);
 380         int err = 0;
 381
 382         /* reset the prep_fn back to the default since the
 383          * driver may have altered it and it's being removed */
 384         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
 385
 386         if (drv && drv->remove)
 387                 err = drv->remove(dev);
 388
 389         return 0;
 390 }
 391
 392 struct bus_type scsi_bus_type = {
 393         .name           = "scsi",
 394         .match          = scsi_bus_match,
 395         .uevent         = scsi_bus_uevent,
 396         .suspend        = scsi_bus_suspend,
 397         .resume         = scsi_bus_resume,
 398         .remove         = scsi_bus_remove,
 399 };
 400
 401 int scsi_sysfs_register(void)
 402 {
 403         int error;
 404
 405         error = bus_register(&scsi_bus_type);
 406         if (!error) {
 407                 error = class_register(&sdev_class);
 408                 if (error)
 409                         bus_unregister(&scsi_bus_type);
 410         }
 411
 412         return error;
 413 }
 414
 415 void scsi_sysfs_unregister(void)
 416 {
 417         class_unregister(&sdev_class);
 418         bus_unregister(&scsi_bus_type);
 419 }
 420
 421 /*
 422  * sdev_show_function: macro to create an attr function that can be used to
 423  * show a non-bit field.
 424  */
 425 #define sdev_show_function(field, format_string)                                \
 426 static ssize_t                                                          \
 427 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
 428 {                                                                       \
 429         struct scsi_device *sdev;                                       \
 430         sdev = to_scsi_device(dev);                                     \
 431         return snprintf (buf, 20, format_string, sdev->field);          \
 432 }                                                                       \
 433
 434 /*
 435  * sdev_rd_attr: macro to create a function and attribute variable for a
 436  * read only field.
 437  */
 438 #define sdev_rd_attr(field, format_string)                              \
 439         sdev_show_function(field, format_string)                        \
 440 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 441
 442
 443 /*
 444  * sdev_rd_attr: create a function and attribute variable for a
 445  * read/write field.
 446  */
 447 #define sdev_rw_attr(field, format_string)                              \
 448         sdev_show_function(field, format_string)                                \
 449                                                                         \
 450 static ssize_t                                                          \
 451 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 452 {                                                                       \
 453         struct scsi_device *sdev;                                       \
 454         sdev = to_scsi_device(dev);                                     \
 455         snscanf (buf, 20, format_string, &sdev->field);                 \
 456         return count;                                                   \
 457 }                                                                       \
 458 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 459
 460 /* Currently we don't export bit fields, but we might in future,
 461  * so leave this code in */
 462 #if 0
 463 /*
 464  * sdev_rd_attr: create a function and attribute variable for a
 465  * read/write bit field.
 466  */
 467 #define sdev_rw_attr_bit(field)                                         \
 468         sdev_show_function(field, "%d\n")                                       \
 469                                                                         \
 470 static ssize_t                                                          \
 471 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 472 {                                                                       \
 473         int ret;                                                        \
 474         struct scsi_device *sdev;                                       \
 475         ret = scsi_sdev_check_buf_bit(buf);                             \
 476         if (ret >= 0)   {                                               \
 477                 sdev = to_scsi_device(dev);                             \
 478                 sdev->field = ret;                                      \
 479                 ret = count;                                            \
 480         }                                                               \
 481         return ret;                                                     \
 482 }                                                                       \
 483 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 484
 485 /*
 486  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 487  * else return -EINVAL.
 488  */
 489 static int scsi_sdev_check_buf_bit(const char *buf)
 490 {
 491         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 492                 if (buf[0] == '1')
 493                         return 1;
 494                 else if (buf[0] == '0')
 495                         return 0;
 496                 else
 497                         return -EINVAL;
 498         } else
 499                 return -EINVAL;
 500 }
 501 #endif
 502 /*
 503  * Create the actual show/store functions and data structures.
 504  */
 505 sdev_rd_attr (device_blocked, "%d\n");
 506 sdev_rd_attr (queue_depth, "%d\n");
 507 sdev_rd_attr (type, "%d\n");
 508 sdev_rd_attr (scsi_level, "%d\n");
 509 sdev_rd_attr (vendor, "%.8s\n");
 510 sdev_rd_attr (model, "%.16s\n");
 511 sdev_rd_attr (rev, "%.4s\n");
 512
 513 static ssize_t
 514 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 515 {
 516         struct scsi_device *sdev;
 517         sdev = to_scsi_device(dev);
 518         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 519 }
 520
 521 static ssize_t
 522 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 523 {
 524         struct scsi_device *sdev;
 525         int timeout;
 526         sdev = to_scsi_device(dev);
 527         sscanf (buf, "%d\n", &timeout);
 528         sdev->timeout = timeout * HZ;
 529         return count;
 530 }
 531 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 532
 533 static ssize_t
 534 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 535 {
 536         scsi_rescan_device(dev);
 537         return count;
 538 }
 539 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 540
 541 static void sdev_store_delete_callback(struct device *dev)
 542 {
 543         scsi_remove_device(to_scsi_device(dev));
 544 }
 545
 546 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
 547                                  size_t count)
 548 {
 549         int rc;
 550
 551         /* An attribute cannot be unregistered by one of its own methods,
 552          * so we have to use this roundabout approach.
 553          */
 554         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 555         if (rc)
 556                 count = rc;
 557         return count;
 558 };
 559 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 560
 561 static ssize_t
 562 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 563 {
 564         int i;
 565         struct scsi_device *sdev = to_scsi_device(dev);
 566         enum scsi_device_state state = 0;
 567
 568         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 569                 const int len = strlen(sdev_states[i].name);
 570                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 571                    buf[len] == '\n') {
 572                         state = sdev_states[i].value;
 573                         break;
 574                 }
 575         }
 576         if (!state)
 577                 return -EINVAL;
 578
 579         if (scsi_device_set_state(sdev, state))
 580                 return -EINVAL;
 581         return count;
 582 }
 583
 584 static ssize_t
 585 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 586 {
 587         struct scsi_device *sdev = to_scsi_device(dev);
 588         const char *name = scsi_device_state_name(sdev->sdev_state);
 589
 590         if (!name)
 591                 return -EINVAL;
 592
 593         return snprintf(buf, 20, "%s\n", name);
 594 }
 595
 596 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 597
 598 static ssize_t
 599 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
 600 {
 601         struct scsi_device *sdev = to_scsi_device(dev);
 602         const char *name = "none";
 603
 604         if (sdev->ordered_tags)
 605                 name = "ordered";
 606         else if (sdev->simple_tags)
 607                 name = "simple";
 608
 609         return snprintf(buf, 20, "%s\n", name);
 610 }
 611
 612 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 613
 614 static ssize_t
 615 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
 616 {
 617         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 618 }
 619
 620 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 621
 622 #define show_sdev_iostat(field)                                         \
 623 static ssize_t                                                          \
 624 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
 625 {                                                                       \
 626         struct scsi_device *sdev = to_scsi_device(dev);                 \
 627         unsigned long long count = atomic_read(&sdev->field);           \
 628         return snprintf(buf, 20, "0x%llx\n", count);                    \
 629 }                                                                       \
 630 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 631
 632 show_sdev_iostat(iorequest_cnt);
 633 show_sdev_iostat(iodone_cnt);
 634 show_sdev_iostat(ioerr_cnt);
 635
 636 static ssize_t
 637 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 638 {
 639         struct scsi_device *sdev;
 640         sdev = to_scsi_device(dev);
 641         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 642 }
 643 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 644
 645 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 646 static ssize_t                                                          \
 647 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 648                                 char *buf)                              \
 649 {                                                                       \
 650         struct scsi_device *sdev = to_scsi_device(dev);                 \
 651         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 652         return snprintf(buf, 20, "%d\n", val);                          \
 653 }
 654
 655 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 656 static ssize_t                                                          \
 657 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr, \
 658                       const char *buf, size_t count)                    \
 659 {                                                                       \
 660         struct scsi_device *sdev = to_scsi_device(dev);                 \
 661         int val = simple_strtoul(buf, NULL, 0);                         \
 662         if (val == 0)                                                   \
 663                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 664         else if (val == 1)                                              \
 665                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 666         else                                                            \
 667                 return -EINVAL;                                         \
 668         return count;                                                   \
 669 }
 670
 671 #define DECLARE_EVT(name, Cap_name)                                     \
 672         DECLARE_EVT_SHOW(name, Cap_name)                                \
 673         DECLARE_EVT_STORE(name, Cap_name)                               \
 674         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 675                            sdev_store_evt_##name);
 676 #define REF_EVT(name) &dev_attr_evt_##name.attr
 677
 678 DECLARE_EVT(media_change, MEDIA_CHANGE)
 679
 680 /* Default template for device attributes.  May NOT be modified */
 681 static struct attribute *scsi_sdev_attrs[] = {
 682         &dev_attr_device_blocked.attr,
 683         &dev_attr_type.attr,
 684         &dev_attr_scsi_level.attr,
 685         &dev_attr_vendor.attr,
 686         &dev_attr_model.attr,
 687         &dev_attr_rev.attr,
 688         &dev_attr_rescan.attr,
 689         &dev_attr_delete.attr,
 690         &dev_attr_state.attr,
 691         &dev_attr_timeout.attr,
 692         &dev_attr_iocounterbits.attr,
 693         &dev_attr_iorequest_cnt.attr,
 694         &dev_attr_iodone_cnt.attr,
 695         &dev_attr_ioerr_cnt.attr,
 696         &dev_attr_modalias.attr,
 697         REF_EVT(media_change),
 698         NULL
 699 };
 700
 701 static struct attribute_group scsi_sdev_attr_group = {
 702         .attrs =        scsi_sdev_attrs,
 703 };
 704
 705 static struct attribute_group *scsi_sdev_attr_groups[] = {
 706         &scsi_sdev_attr_group,
 707         NULL
 708 };
 709
 710 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 711                                          size_t count)
 712 {
 713         int depth, retval;
 714         struct scsi_device *sdev = to_scsi_device(dev);
 715         struct scsi_host_template *sht = sdev->host->hostt;
 716
 717         if (!sht->change_queue_depth)
 718                 return -EINVAL;
 719
 720         depth = simple_strtoul(buf, NULL, 0);
 721
 722         if (depth < 1)
 723                 return -EINVAL;
 724
 725         retval = sht->change_queue_depth(sdev, depth);
 726         if (retval < 0)
 727                 return retval;
 728
 729         return count;
 730 }
 731
 732 static struct device_attribute sdev_attr_queue_depth_rw =
 733         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 734                sdev_store_queue_depth_rw);
 735
 736 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 737                                         size_t count)
 738 {
 739         struct scsi_device *sdev = to_scsi_device(dev);
 740         struct scsi_host_template *sht = sdev->host->hostt;
 741         int tag_type = 0, retval;
 742         int prev_tag_type = scsi_get_tag_type(sdev);
 743
 744         if (!sdev->tagged_supported || !sht->change_queue_type)
 745                 return -EINVAL;
 746
 747         if (strncmp(buf, "ordered", 7) == 0)
 748                 tag_type = MSG_ORDERED_TAG;
 749         else if (strncmp(buf, "simple", 6) == 0)
 750                 tag_type = MSG_SIMPLE_TAG;
 751         else if (strncmp(buf, "none", 4) != 0)
 752                 return -EINVAL;
 753
 754         if (tag_type == prev_tag_type)
 755                 return count;
 756
 757         retval = sht->change_queue_type(sdev, tag_type);
 758         if (retval < 0)
 759                 return retval;
 760
 761         return count;
 762 }
 763
 764 static struct device_attribute sdev_attr_queue_type_rw =
 765         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 766                sdev_store_queue_type_rw);
 767
 768 /**
 769  * scsi_sysfs_add_sdev - add scsi device to sysfs
 770  * @sdev:       scsi_device to add
 771  *
 772  * Return value:
 773  *      0 on Success / non-zero on Failure
 774  **/
 775 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 776 {
 777         int error, i;
 778         struct request_queue *rq = sdev->request_queue;
 779
 780         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 781                 return error;
 782
 783         error = device_add(&sdev->sdev_gendev);
 784         if (error) {
 785                 put_device(sdev->sdev_gendev.parent);
 786                 printk(KERN_INFO "error 1\n");
 787                 return error;
 788         }
 789         error = class_device_add(&sdev->sdev_classdev);
 790         if (error) {
 791                 printk(KERN_INFO "error 2\n");
 792                 goto clean_device;
 793         }
 794
 795         /* take a reference for the sdev_classdev; this is
 796          * released by the sdev_class .release */
 797         get_device(&sdev->sdev_gendev);
 798
 799         /* create queue files, which may be writable, depending on the host */
 800         if (sdev->host->hostt->change_queue_depth)
 801                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 802         else
 803                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 804         if (error) {
 805                 __scsi_remove_device(sdev);
 806                 goto out;
 807         }
 808         if (sdev->host->hostt->change_queue_type)
 809                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 810         else
 811                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 812         if (error) {
 813                 __scsi_remove_device(sdev);
 814                 goto out;
 815         }
 816
 817         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
 818
 819         if (error)
 820                 sdev_printk(KERN_INFO, sdev,
 821                             "Failed to register bsg queue, errno=%d\n", error);
 822
 823         /* we're treating error on bsg register as non-fatal, so pretend
 824          * nothing went wrong */
 825         error = 0;
 826
 827         /* add additional host specific attributes */
 828         if (sdev->host->hostt->sdev_attrs) {
 829                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 830                         error = device_create_file(&sdev->sdev_gendev,
 831                                         sdev->host->hostt->sdev_attrs[i]);
 832                         if (error) {
 833                                 __scsi_remove_device(sdev);
 834                                 goto out;
 835                         }
 836                 }
 837         }
 838
 839         transport_add_device(&sdev->sdev_gendev);
 840  out:
 841         return error;
 842
 843  clean_device:
 844         scsi_device_set_state(sdev, SDEV_CANCEL);
 845
 846         device_del(&sdev->sdev_gendev);
 847         transport_destroy_device(&sdev->sdev_gendev);
 848         put_device(&sdev->sdev_gendev);
 849
 850         return error;
 851 }
 852
 853 void __scsi_remove_device(struct scsi_device *sdev)
 854 {
 855         struct device *dev = &sdev->sdev_gendev;
 856
 857         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 858                 return;
 859
 860         bsg_unregister_queue(sdev->request_queue);
 861         class_device_unregister(&sdev->sdev_classdev);
 862         transport_remove_device(dev);
 863         device_del(dev);
 864         scsi_device_set_state(sdev, SDEV_DEL);
 865         if (sdev->host->hostt->slave_destroy)
 866                 sdev->host->hostt->slave_destroy(sdev);
 867         transport_destroy_device(dev);
 868         put_device(dev);
 869 }
 870
 871 /**
 872  * scsi_remove_device - unregister a device from the scsi bus
 873  * @sdev:       scsi_device to unregister
 874  **/
 875 void scsi_remove_device(struct scsi_device *sdev)
 876 {
 877         struct Scsi_Host *shost = sdev->host;
 878
 879         mutex_lock(&shost->scan_mutex);
 880         __scsi_remove_device(sdev);
 881         mutex_unlock(&shost->scan_mutex);
 882 }
 883 EXPORT_SYMBOL(scsi_remove_device);
 884
 885 static void __scsi_remove_target(struct scsi_target *starget)
 886 {
 887         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 888         unsigned long flags;
 889         struct scsi_device *sdev;
 890
 891         spin_lock_irqsave(shost->host_lock, flags);
 892         starget->reap_ref++;
 893  restart:
 894         list_for_each_entry(sdev, &shost->__devices, siblings) {
 895                 if (sdev->channel != starget->channel ||
 896                     sdev->id != starget->id ||
 897                     sdev->sdev_state == SDEV_DEL)
 898                         continue;
 899                 spin_unlock_irqrestore(shost->host_lock, flags);
 900                 scsi_remove_device(sdev);
 901                 spin_lock_irqsave(shost->host_lock, flags);
 902                 goto restart;
 903         }
 904         spin_unlock_irqrestore(shost->host_lock, flags);
 905         scsi_target_reap(starget);
 906 }
 907
 908 static int __remove_child (struct device * dev, void * data)
 909 {
 910         if (scsi_is_target_device(dev))
 911                 __scsi_remove_target(to_scsi_target(dev));
 912         return 0;
 913 }
 914
 915 /**
 916  * scsi_remove_target - try to remove a target and all its devices
 917  * @dev: generic starget or parent of generic stargets to be removed
 918  *
 919  * Note: This is slightly racy.  It is possible that if the user
 920  * requests the addition of another device then the target won't be
 921  * removed.
 922  */
 923 void scsi_remove_target(struct device *dev)
 924 {
 925         struct device *rdev;
 926
 927         if (scsi_is_target_device(dev)) {
 928                 __scsi_remove_target(to_scsi_target(dev));
 929                 return;
 930         }
 931
 932         rdev = get_device(dev);
 933         device_for_each_child(dev, NULL, __remove_child);
 934         put_device(rdev);
 935 }
 936 EXPORT_SYMBOL(scsi_remove_target);
 937
 938 int scsi_register_driver(struct device_driver *drv)
 939 {
 940         drv->bus = &scsi_bus_type;
 941
 942         return driver_register(drv);
 943 }
 944 EXPORT_SYMBOL(scsi_register_driver);
 945
 946 int scsi_register_interface(struct class_interface *intf)
 947 {
 948         intf->class = &sdev_class;
 949
 950         return class_interface_register(intf);
 951 }
 952 EXPORT_SYMBOL(scsi_register_interface);
 953
 954
 955 static struct class_device_attribute *class_attr_overridden(
 956                 struct class_device_attribute **attrs,
 957                 struct class_device_attribute *attr)
 958 {
 959         int i;
 960
 961         if (!attrs)
 962                 return NULL;
 963         for (i = 0; attrs[i]; i++)
 964                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 965                         return attrs[i];
 966         return NULL;
 967 }
 968
 969 static int class_attr_add(struct class_device *classdev,
 970                 struct class_device_attribute *attr)
 971 {
 972         struct class_device_attribute *base_attr;
 973
 974         /*
 975          * Spare the caller from having to copy things it's not interested in.
 976          */
 977         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 978         if (base_attr) {
 979                 /* extend permissions */
 980                 attr->attr.mode |= base_attr->attr.mode;
 981
 982                 /* override null show/store with default */
 983                 if (!attr->show)
 984                         attr->show = base_attr->show;
 985                 if (!attr->store)
 986                         attr->store = base_attr->store;
 987         }
 988
 989         return class_device_create_file(classdev, attr);
 990 }
 991
 992 /**
 993  * scsi_sysfs_add_host - add scsi host to subsystem
 994  * @shost:     scsi host struct to add to subsystem
 995  * @dev:       parent struct device pointer
 996  **/
 997 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 998 {
 999         int error, i;
1000
1001         if (shost->hostt->shost_attrs) {
1002                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1003                         error = class_attr_add(&shost->shost_classdev,
1004                                         shost->hostt->shost_attrs[i]);
1005                         if (error)
1006                                 return error;
1007                 }
1008         }
1009
1010         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
1011                 if (!class_attr_overridden(shost->hostt->shost_attrs,
1012                                         scsi_sysfs_shost_attrs[i])) {
1013                         error = class_device_create_file(&shost->shost_classdev,
1014                                         scsi_sysfs_shost_attrs[i]);
1015                         if (error)
1016                                 return error;
1017                 }
1018         }
1019
1020         transport_register_device(&shost->shost_gendev);
1021         return 0;
1022 }
1023
1024 static struct device_type scsi_dev_type = {
1025         .name =         "scsi_device",
1026         .release =      scsi_device_dev_release,
1027         .groups =       scsi_sdev_attr_groups,
1028 };
1029
1030 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1031 {
1032         unsigned long flags;
1033         struct Scsi_Host *shost = sdev->host;
1034         struct scsi_target  *starget = sdev->sdev_target;
1035
1036         device_initialize(&sdev->sdev_gendev);
1037         sdev->sdev_gendev.bus = &scsi_bus_type;
1038         sdev->sdev_gendev.type = &scsi_dev_type;
1039         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1040                 sdev->host->host_no, sdev->channel, sdev->id,
1041                 sdev->lun);
1042
1043         class_device_initialize(&sdev->sdev_classdev);
1044         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
1045         sdev->sdev_classdev.class = &sdev_class;
1046         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
1047                  "%d:%d:%d:%d", sdev->host->host_no,
1048                  sdev->channel, sdev->id, sdev->lun);
1049         sdev->scsi_level = starget->scsi_level;
1050         transport_setup_device(&sdev->sdev_gendev);
1051         spin_lock_irqsave(shost->host_lock, flags);
1052         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1053         list_add_tail(&sdev->siblings, &shost->__devices);
1054         spin_unlock_irqrestore(shost->host_lock, flags);
1055 }
1056
1057 int scsi_is_sdev_device(const struct device *dev)
1058 {
1059         return dev->type == &scsi_dev_type;
1060 }
1061 EXPORT_SYMBOL(scsi_is_sdev_device);
1062
1063 /* A blank transport template that is used in drivers that don't
1064  * yet implement Transport Attributes */
1065 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };