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         /* NULL queue means the device can't be used */
 322         sdev->request_queue = NULL;
 323
 324         scsi_target_reap(scsi_target(sdev));
 325
 326         kfree(sdev->inquiry);
 327         kfree(sdev);
 328
 329         if (parent)
 330                 put_device(parent);
 331 }
 332
 333 static void scsi_device_dev_release(struct device *dev)
 334 {
 335         struct scsi_device *sdp = to_scsi_device(dev);
 336         execute_in_process_context(scsi_device_dev_release_usercontext,
 337                                    &sdp->ew);
 338 }
 339
 340 static struct class sdev_class = {
 341         .name           = "scsi_device",
 342         .dev_release    = scsi_device_cls_release,
 343 };
 344
 345 /* all probing is done in the individual ->probe routines */
 346 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 347 {
 348         struct scsi_device *sdp;
 349
 350         if (dev->type != &scsi_dev_type)
 351                 return 0;
 352
 353         sdp = to_scsi_device(dev);
 354         if (sdp->no_uld_attach)
 355                 return 0;
 356         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 357 }
 358
 359 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 360 {
 361         struct scsi_device *sdev;
 362
 363         if (dev->type != &scsi_dev_type)
 364                 return 0;
 365
 366         sdev = to_scsi_device(dev);
 367
 368         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 369         return 0;
 370 }
 371
 372 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 373 {
 374         struct device_driver *drv;
 375         struct scsi_device *sdev;
 376         int err;
 377
 378         if (dev->type != &scsi_dev_type)
 379                 return 0;
 380
 381         drv = dev->driver;
 382         sdev = to_scsi_device(dev);
 383
 384         err = scsi_device_quiesce(sdev);
 385         if (err)
 386                 return err;
 387
 388         if (drv && drv->suspend) {
 389                 err = drv->suspend(dev, state);
 390                 if (err)
 391                         return err;
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int scsi_bus_resume(struct device * dev)
 398 {
 399         struct device_driver *drv;
 400         struct scsi_device *sdev;
 401         int err = 0;
 402
 403         if (dev->type != &scsi_dev_type)
 404                 return 0;
 405
 406         drv = dev->driver;
 407         sdev = to_scsi_device(dev);
 408
 409         if (drv && drv->resume)
 410                 err = drv->resume(dev);
 411
 412         scsi_device_resume(sdev);
 413
 414         return err;
 415 }
 416
 417 struct bus_type scsi_bus_type = {
 418         .name           = "scsi",
 419         .match          = scsi_bus_match,
 420         .uevent         = scsi_bus_uevent,
 421         .suspend        = scsi_bus_suspend,
 422         .resume         = scsi_bus_resume,
 423 };
 424 EXPORT_SYMBOL_GPL(scsi_bus_type);
 425
 426 int scsi_sysfs_register(void)
 427 {
 428         int error;
 429
 430         error = bus_register(&scsi_bus_type);
 431         if (!error) {
 432                 error = class_register(&sdev_class);
 433                 if (error)
 434                         bus_unregister(&scsi_bus_type);
 435         }
 436
 437         return error;
 438 }
 439
 440 void scsi_sysfs_unregister(void)
 441 {
 442         class_unregister(&sdev_class);
 443         bus_unregister(&scsi_bus_type);
 444 }
 445
 446 /*
 447  * sdev_show_function: macro to create an attr function that can be used to
 448  * show a non-bit field.
 449  */
 450 #define sdev_show_function(field, format_string)                                \
 451 static ssize_t                                                          \
 452 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 453                    char *buf)                                           \
 454 {                                                                       \
 455         struct scsi_device *sdev;                                       \
 456         sdev = to_scsi_device(dev);                                     \
 457         return snprintf (buf, 20, format_string, sdev->field);          \
 458 }                                                                       \
 459
 460 /*
 461  * sdev_rd_attr: macro to create a function and attribute variable for a
 462  * read only field.
 463  */
 464 #define sdev_rd_attr(field, format_string)                              \
 465         sdev_show_function(field, format_string)                        \
 466 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 467
 468
 469 /*
 470  * sdev_rd_attr: create a function and attribute variable for a
 471  * read/write field.
 472  */
 473 #define sdev_rw_attr(field, format_string)                              \
 474         sdev_show_function(field, format_string)                                \
 475                                                                         \
 476 static ssize_t                                                          \
 477 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 478                     const char *buf, size_t count)                      \
 479 {                                                                       \
 480         struct scsi_device *sdev;                                       \
 481         sdev = to_scsi_device(dev);                                     \
 482         snscanf (buf, 20, format_string, &sdev->field);                 \
 483         return count;                                                   \
 484 }                                                                       \
 485 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 486
 487 /* Currently we don't export bit fields, but we might in future,
 488  * so leave this code in */
 489 #if 0
 490 /*
 491  * sdev_rd_attr: create a function and attribute variable for a
 492  * read/write bit field.
 493  */
 494 #define sdev_rw_attr_bit(field)                                         \
 495         sdev_show_function(field, "%d\n")                                       \
 496                                                                         \
 497 static ssize_t                                                          \
 498 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 499                     const char *buf, size_t count)                      \
 500 {                                                                       \
 501         int ret;                                                        \
 502         struct scsi_device *sdev;                                       \
 503         ret = scsi_sdev_check_buf_bit(buf);                             \
 504         if (ret >= 0)   {                                               \
 505                 sdev = to_scsi_device(dev);                             \
 506                 sdev->field = ret;                                      \
 507                 ret = count;                                            \
 508         }                                                               \
 509         return ret;                                                     \
 510 }                                                                       \
 511 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 512
 513 /*
 514  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 515  * else return -EINVAL.
 516  */
 517 static int scsi_sdev_check_buf_bit(const char *buf)
 518 {
 519         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 520                 if (buf[0] == '1')
 521                         return 1;
 522                 else if (buf[0] == '0')
 523                         return 0;
 524                 else
 525                         return -EINVAL;
 526         } else
 527                 return -EINVAL;
 528 }
 529 #endif
 530 /*
 531  * Create the actual show/store functions and data structures.
 532  */
 533 sdev_rd_attr (device_blocked, "%d\n");
 534 sdev_rd_attr (queue_depth, "%d\n");
 535 sdev_rd_attr (type, "%d\n");
 536 sdev_rd_attr (scsi_level, "%d\n");
 537 sdev_rd_attr (vendor, "%.8s\n");
 538 sdev_rd_attr (model, "%.16s\n");
 539 sdev_rd_attr (rev, "%.4s\n");
 540
 541 /*
 542  * TODO: can we make these symlinks to the block layer ones?
 543  */
 544 static ssize_t
 545 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 546 {
 547         struct scsi_device *sdev;
 548         sdev = to_scsi_device(dev);
 549         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 550 }
 551
 552 static ssize_t
 553 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 554                     const char *buf, size_t count)
 555 {
 556         struct scsi_device *sdev;
 557         int timeout;
 558         sdev = to_scsi_device(dev);
 559         sscanf (buf, "%d\n", &timeout);
 560         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 561         return count;
 562 }
 563 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 564
 565 static ssize_t
 566 store_rescan_field (struct device *dev, struct device_attribute *attr,
 567                     const char *buf, size_t count)
 568 {
 569         scsi_rescan_device(dev);
 570         return count;
 571 }
 572 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 573
 574 static void sdev_store_delete_callback(struct device *dev)
 575 {
 576         scsi_remove_device(to_scsi_device(dev));
 577 }
 578
 579 static ssize_t
 580 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 581                   const char *buf, size_t count)
 582 {
 583         int rc;
 584
 585         /* An attribute cannot be unregistered by one of its own methods,
 586          * so we have to use this roundabout approach.
 587          */
 588         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 589         if (rc)
 590                 count = rc;
 591         return count;
 592 };
 593 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 594
 595 static ssize_t
 596 store_state_field(struct device *dev, struct device_attribute *attr,
 597                   const char *buf, size_t count)
 598 {
 599         int i;
 600         struct scsi_device *sdev = to_scsi_device(dev);
 601         enum scsi_device_state state = 0;
 602
 603         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 604                 const int len = strlen(sdev_states[i].name);
 605                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 606                    buf[len] == '\n') {
 607                         state = sdev_states[i].value;
 608                         break;
 609                 }
 610         }
 611         if (!state)
 612                 return -EINVAL;
 613
 614         if (scsi_device_set_state(sdev, state))
 615                 return -EINVAL;
 616         return count;
 617 }
 618
 619 static ssize_t
 620 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 621 {
 622         struct scsi_device *sdev = to_scsi_device(dev);
 623         const char *name = scsi_device_state_name(sdev->sdev_state);
 624
 625         if (!name)
 626                 return -EINVAL;
 627
 628         return snprintf(buf, 20, "%s\n", name);
 629 }
 630
 631 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 632
 633 static ssize_t
 634 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 635                       char *buf)
 636 {
 637         struct scsi_device *sdev = to_scsi_device(dev);
 638         const char *name = "none";
 639
 640         if (sdev->ordered_tags)
 641                 name = "ordered";
 642         else if (sdev->simple_tags)
 643                 name = "simple";
 644
 645         return snprintf(buf, 20, "%s\n", name);
 646 }
 647
 648 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 649
 650 static ssize_t
 651 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 652 {
 653         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 654 }
 655
 656 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 657
 658 #define show_sdev_iostat(field)                                         \
 659 static ssize_t                                                          \
 660 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 661                     char *buf)                                          \
 662 {                                                                       \
 663         struct scsi_device *sdev = to_scsi_device(dev);                 \
 664         unsigned long long count = atomic_read(&sdev->field);           \
 665         return snprintf(buf, 20, "0x%llx\n", count);                    \
 666 }                                                                       \
 667 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 668
 669 show_sdev_iostat(iorequest_cnt);
 670 show_sdev_iostat(iodone_cnt);
 671 show_sdev_iostat(ioerr_cnt);
 672
 673 static ssize_t
 674 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 675 {
 676         struct scsi_device *sdev;
 677         sdev = to_scsi_device(dev);
 678         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 679 }
 680 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 681
 682 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 683 static ssize_t                                                          \
 684 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 685                      char *buf)                                         \
 686 {                                                                       \
 687         struct scsi_device *sdev = to_scsi_device(dev);                 \
 688         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 689         return snprintf(buf, 20, "%d\n", val);                          \
 690 }
 691
 692 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 693 static ssize_t                                                          \
 694 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 695                       const char *buf, size_t count)                    \
 696 {                                                                       \
 697         struct scsi_device *sdev = to_scsi_device(dev);                 \
 698         int val = simple_strtoul(buf, NULL, 0);                         \
 699         if (val == 0)                                                   \
 700                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 701         else if (val == 1)                                              \
 702                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 703         else                                                            \
 704                 return -EINVAL;                                         \
 705         return count;                                                   \
 706 }
 707
 708 #define DECLARE_EVT(name, Cap_name)                                     \
 709         DECLARE_EVT_SHOW(name, Cap_name)                                \
 710         DECLARE_EVT_STORE(name, Cap_name)                               \
 711         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 712                            sdev_store_evt_##name);
 713 #define REF_EVT(name) &dev_attr_evt_##name.attr
 714
 715 DECLARE_EVT(media_change, MEDIA_CHANGE)
 716
 717 /* Default template for device attributes.  May NOT be modified */
 718 static struct attribute *scsi_sdev_attrs[] = {
 719         &dev_attr_device_blocked.attr,
 720         &dev_attr_type.attr,
 721         &dev_attr_scsi_level.attr,
 722         &dev_attr_vendor.attr,
 723         &dev_attr_model.attr,
 724         &dev_attr_rev.attr,
 725         &dev_attr_rescan.attr,
 726         &dev_attr_delete.attr,
 727         &dev_attr_state.attr,
 728         &dev_attr_timeout.attr,
 729         &dev_attr_iocounterbits.attr,
 730         &dev_attr_iorequest_cnt.attr,
 731         &dev_attr_iodone_cnt.attr,
 732         &dev_attr_ioerr_cnt.attr,
 733         &dev_attr_modalias.attr,
 734         REF_EVT(media_change),
 735         NULL
 736 };
 737
 738 static struct attribute_group scsi_sdev_attr_group = {
 739         .attrs =        scsi_sdev_attrs,
 740 };
 741
 742 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 743         &scsi_sdev_attr_group,
 744         NULL
 745 };
 746
 747 static ssize_t
 748 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 749                           const char *buf, size_t count)
 750 {
 751         int depth, retval;
 752         struct scsi_device *sdev = to_scsi_device(dev);
 753         struct scsi_host_template *sht = sdev->host->hostt;
 754
 755         if (!sht->change_queue_depth)
 756                 return -EINVAL;
 757
 758         depth = simple_strtoul(buf, NULL, 0);
 759
 760         if (depth < 1)
 761                 return -EINVAL;
 762
 763         retval = sht->change_queue_depth(sdev, depth,
 764                                          SCSI_QDEPTH_DEFAULT);
 765         if (retval < 0)
 766                 return retval;
 767
 768         sdev->max_queue_depth = sdev->queue_depth;
 769
 770         return count;
 771 }
 772
 773 static struct device_attribute sdev_attr_queue_depth_rw =
 774         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 775                sdev_store_queue_depth_rw);
 776
 777 static ssize_t
 778 sdev_show_queue_ramp_up_period(struct device *dev,
 779                                struct device_attribute *attr,
 780                                char *buf)
 781 {
 782         struct scsi_device *sdev;
 783         sdev = to_scsi_device(dev);
 784         return snprintf(buf, 20, "%u\n",
 785                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 786 }
 787
 788 static ssize_t
 789 sdev_store_queue_ramp_up_period(struct device *dev,
 790                                 struct device_attribute *attr,
 791                                 const char *buf, size_t count)
 792 {
 793         struct scsi_device *sdev = to_scsi_device(dev);
 794         unsigned long period;
 795
 796         if (strict_strtoul(buf, 10, &period))
 797                 return -EINVAL;
 798
 799         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 800         return period;
 801 }
 802
 803 static struct device_attribute sdev_attr_queue_ramp_up_period =
 804         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 805                sdev_show_queue_ramp_up_period,
 806                sdev_store_queue_ramp_up_period);
 807
 808 static ssize_t
 809 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 810                          const char *buf, size_t count)
 811 {
 812         struct scsi_device *sdev = to_scsi_device(dev);
 813         struct scsi_host_template *sht = sdev->host->hostt;
 814         int tag_type = 0, retval;
 815         int prev_tag_type = scsi_get_tag_type(sdev);
 816
 817         if (!sdev->tagged_supported || !sht->change_queue_type)
 818                 return -EINVAL;
 819
 820         if (strncmp(buf, "ordered", 7) == 0)
 821                 tag_type = MSG_ORDERED_TAG;
 822         else if (strncmp(buf, "simple", 6) == 0)
 823                 tag_type = MSG_SIMPLE_TAG;
 824         else if (strncmp(buf, "none", 4) != 0)
 825                 return -EINVAL;
 826
 827         if (tag_type == prev_tag_type)
 828                 return count;
 829
 830         retval = sht->change_queue_type(sdev, tag_type);
 831         if (retval < 0)
 832                 return retval;
 833
 834         return count;
 835 }
 836
 837 static int scsi_target_add(struct scsi_target *starget)
 838 {
 839         int error;
 840
 841         if (starget->state != STARGET_CREATED)
 842                 return 0;
 843
 844         error = device_add(&starget->dev);
 845         if (error) {
 846                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 847                 get_device(&starget->dev);
 848                 scsi_target_reap(starget);
 849                 put_device(&starget->dev);
 850                 return error;
 851         }
 852         transport_add_device(&starget->dev);
 853         starget->state = STARGET_RUNNING;
 854
 855         return 0;
 856 }
 857
 858 static struct device_attribute sdev_attr_queue_type_rw =
 859         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 860                sdev_store_queue_type_rw);
 861
 862 /**
 863  * scsi_sysfs_add_sdev - add scsi device to sysfs
 864  * @sdev:       scsi_device to add
 865  *
 866  * Return value:
 867  *      0 on Success / non-zero on Failure
 868  **/
 869 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 870 {
 871         int error, i;
 872         struct request_queue *rq = sdev->request_queue;
 873         struct scsi_target *starget = sdev->sdev_target;
 874
 875         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 876                 return error;
 877
 878         error = scsi_target_add(starget);
 879         if (error)
 880                 return error;
 881
 882         transport_configure_device(&starget->dev);
 883         error = device_add(&sdev->sdev_gendev);
 884         if (error) {
 885                 printk(KERN_INFO "error 1\n");
 886                 goto out_remove;
 887         }
 888         error = device_add(&sdev->sdev_dev);
 889         if (error) {
 890                 printk(KERN_INFO "error 2\n");
 891                 device_del(&sdev->sdev_gendev);
 892                 goto out_remove;
 893         }
 894         transport_add_device(&sdev->sdev_gendev);
 895         sdev->is_visible = 1;
 896
 897         /* create queue files, which may be writable, depending on the host */
 898         if (sdev->host->hostt->change_queue_depth) {
 899                 error = device_create_file(&sdev->sdev_gendev,
 900                                            &sdev_attr_queue_depth_rw);
 901                 error = device_create_file(&sdev->sdev_gendev,
 902                                            &sdev_attr_queue_ramp_up_period);
 903         }
 904         else
 905                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 906         if (error)
 907                 goto out_remove;
 908
 909         if (sdev->host->hostt->change_queue_type)
 910                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 911         else
 912                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 913         if (error)
 914                 goto out_remove;
 915
 916         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 917
 918         if (error)
 919                 /* we're treating error on bsg register as non-fatal,
 920                  * so pretend nothing went wrong */
 921                 sdev_printk(KERN_INFO, sdev,
 922                             "Failed to register bsg queue, errno=%d\n", error);
 923
 924         /* add additional host specific attributes */
 925         if (sdev->host->hostt->sdev_attrs) {
 926                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 927                         error = device_create_file(&sdev->sdev_gendev,
 928                                         sdev->host->hostt->sdev_attrs[i]);
 929                         if (error)
 930                                 goto out_remove;
 931                 }
 932         }
 933
 934         return 0;
 935
 936  out_remove:
 937         __scsi_remove_device(sdev);
 938         return error;
 939
 940 }
 941
 942 void __scsi_remove_device(struct scsi_device *sdev)
 943 {
 944         struct device *dev = &sdev->sdev_gendev;
 945
 946         if (sdev->is_visible) {
 947                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 948                         return;
 949
 950                 bsg_unregister_queue(sdev->request_queue);
 951                 device_unregister(&sdev->sdev_dev);
 952                 transport_remove_device(dev);
 953                 device_del(dev);
 954         } else
 955                 put_device(&sdev->sdev_dev);
 956         scsi_device_set_state(sdev, SDEV_DEL);
 957         if (sdev->host->hostt->slave_destroy)
 958                 sdev->host->hostt->slave_destroy(sdev);
 959         transport_destroy_device(dev);
 960
 961         /* cause the request function to reject all I/O requests */
 962         sdev->request_queue->queuedata = NULL;
 963
 964         /* Freeing the queue signals to block that we're done */
 965         scsi_free_queue(sdev->request_queue);
 966         put_device(dev);
 967 }
 968
 969 /**
 970  * scsi_remove_device - unregister a device from the scsi bus
 971  * @sdev:       scsi_device to unregister
 972  **/
 973 void scsi_remove_device(struct scsi_device *sdev)
 974 {
 975         struct Scsi_Host *shost = sdev->host;
 976
 977         mutex_lock(&shost->scan_mutex);
 978         __scsi_remove_device(sdev);
 979         mutex_unlock(&shost->scan_mutex);
 980 }
 981 EXPORT_SYMBOL(scsi_remove_device);
 982
 983 static void __scsi_remove_target(struct scsi_target *starget)
 984 {
 985         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 986         unsigned long flags;
 987         struct scsi_device *sdev;
 988
 989         spin_lock_irqsave(shost->host_lock, flags);
 990         starget->reap_ref++;
 991  restart:
 992         list_for_each_entry(sdev, &shost->__devices, siblings) {
 993                 if (sdev->channel != starget->channel ||
 994                     sdev->id != starget->id ||
 995                     scsi_device_get(sdev))
 996                         continue;
 997                 spin_unlock_irqrestore(shost->host_lock, flags);
 998                 scsi_remove_device(sdev);
 999                 scsi_device_put(sdev);
1000                 spin_lock_irqsave(shost->host_lock, flags);
1001                 goto restart;
1002         }
1003         spin_unlock_irqrestore(shost->host_lock, flags);
1004         scsi_target_reap(starget);
1005 }
1006
1007 static int __remove_child (struct device * dev, void * data)
1008 {
1009         if (scsi_is_target_device(dev))
1010                 __scsi_remove_target(to_scsi_target(dev));
1011         return 0;
1012 }
1013
1014 /**
1015  * scsi_remove_target - try to remove a target and all its devices
1016  * @dev: generic starget or parent of generic stargets to be removed
1017  *
1018  * Note: This is slightly racy.  It is possible that if the user
1019  * requests the addition of another device then the target won't be
1020  * removed.
1021  */
1022 void scsi_remove_target(struct device *dev)
1023 {
1024         struct device *rdev;
1025
1026         if (scsi_is_target_device(dev)) {
1027                 __scsi_remove_target(to_scsi_target(dev));
1028                 return;
1029         }
1030
1031         rdev = get_device(dev);
1032         device_for_each_child(dev, NULL, __remove_child);
1033         put_device(rdev);
1034 }
1035 EXPORT_SYMBOL(scsi_remove_target);
1036
1037 int scsi_register_driver(struct device_driver *drv)
1038 {
1039         drv->bus = &scsi_bus_type;
1040
1041         return driver_register(drv);
1042 }
1043 EXPORT_SYMBOL(scsi_register_driver);
1044
1045 int scsi_register_interface(struct class_interface *intf)
1046 {
1047         intf->class = &sdev_class;
1048
1049         return class_interface_register(intf);
1050 }
1051 EXPORT_SYMBOL(scsi_register_interface);
1052
1053 /**
1054  * scsi_sysfs_add_host - add scsi host to subsystem
1055  * @shost:     scsi host struct to add to subsystem
1056  **/
1057 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1058 {
1059         int error, i;
1060
1061         /* add host specific attributes */
1062         if (shost->hostt->shost_attrs) {
1063                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1064                         error = device_create_file(&shost->shost_dev,
1065                                         shost->hostt->shost_attrs[i]);
1066                         if (error)
1067                                 return error;
1068                 }
1069         }
1070
1071         transport_register_device(&shost->shost_gendev);
1072         transport_configure_device(&shost->shost_gendev);
1073         return 0;
1074 }
1075
1076 static struct device_type scsi_dev_type = {
1077         .name =         "scsi_device",
1078         .release =      scsi_device_dev_release,
1079         .groups =       scsi_sdev_attr_groups,
1080 };
1081
1082 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1083 {
1084         unsigned long flags;
1085         struct Scsi_Host *shost = sdev->host;
1086         struct scsi_target  *starget = sdev->sdev_target;
1087
1088         device_initialize(&sdev->sdev_gendev);
1089         sdev->sdev_gendev.bus = &scsi_bus_type;
1090         sdev->sdev_gendev.type = &scsi_dev_type;
1091         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1092                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1093
1094         device_initialize(&sdev->sdev_dev);
1095         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1096         sdev->sdev_dev.class = &sdev_class;
1097         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1098                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1099         sdev->scsi_level = starget->scsi_level;
1100         transport_setup_device(&sdev->sdev_gendev);
1101         spin_lock_irqsave(shost->host_lock, flags);
1102         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1103         list_add_tail(&sdev->siblings, &shost->__devices);
1104         spin_unlock_irqrestore(shost->host_lock, flags);
1105 }
1106
1107 int scsi_is_sdev_device(const struct device *dev)
1108 {
1109         return dev->type == &scsi_dev_type;
1110 }
1111 EXPORT_SYMBOL(scsi_is_sdev_device);
1112
1113 /* A blank transport template that is used in drivers that don't
1114  * yet implement Transport Attributes */
1115 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };