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