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