linux/drivers/scsi/scsi_sysfs.c
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   1/*
   2 * scsi_sysfs.c
   3 *
   4 * SCSI sysfs interface routines.
   5 *
   6 * Created to pull SCSI mid layer sysfs routines into one file.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/slab.h>
  11#include <linux/init.h>
  12#include <linux/blkdev.h>
  13#include <linux/device.h>
  14#include <linux/pm_runtime.h>
  15
  16#include <scsi/scsi.h>
  17#include <scsi/scsi_device.h>
  18#include <scsi/scsi_host.h>
  19#include <scsi/scsi_tcq.h>
  20#include <scsi/scsi_transport.h>
  21#include <scsi/scsi_driver.h>
  22
  23#include "scsi_priv.h"
  24#include "scsi_logging.h"
  25
  26static struct device_type scsi_dev_type;
  27
  28static const struct {
  29        enum scsi_device_state  value;
  30        char                    *name;
  31} sdev_states[] = {
  32        { SDEV_CREATED, "created" },
  33        { SDEV_RUNNING, "running" },
  34        { SDEV_CANCEL, "cancel" },
  35        { SDEV_DEL, "deleted" },
  36        { SDEV_QUIESCE, "quiesce" },
  37        { SDEV_OFFLINE, "offline" },
  38        { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  39        { SDEV_BLOCK,   "blocked" },
  40        { SDEV_CREATED_BLOCK, "created-blocked" },
  41};
  42
  43const char *scsi_device_state_name(enum scsi_device_state state)
  44{
  45        int i;
  46        char *name = NULL;
  47
  48        for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  49                if (sdev_states[i].value == state) {
  50                        name = sdev_states[i].name;
  51                        break;
  52                }
  53        }
  54        return name;
  55}
  56
  57static const struct {
  58        enum scsi_host_state    value;
  59        char                    *name;
  60} shost_states[] = {
  61        { SHOST_CREATED, "created" },
  62        { SHOST_RUNNING, "running" },
  63        { SHOST_CANCEL, "cancel" },
  64        { SHOST_DEL, "deleted" },
  65        { SHOST_RECOVERY, "recovery" },
  66        { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  67        { SHOST_DEL_RECOVERY, "deleted/recovery", },
  68};
  69const char *scsi_host_state_name(enum scsi_host_state state)
  70{
  71        int i;
  72        char *name = NULL;
  73
  74        for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  75                if (shost_states[i].value == state) {
  76                        name = shost_states[i].name;
  77                        break;
  78                }
  79        }
  80        return name;
  81}
  82
  83static int check_set(unsigned int *val, char *src)
  84{
  85        char *last;
  86
  87        if (strncmp(src, "-", 20) == 0) {
  88                *val = SCAN_WILD_CARD;
  89        } else {
  90                /*
  91                 * Doesn't check for int overflow
  92                 */
  93                *val = simple_strtoul(src, &last, 0);
  94                if (*last != '\0')
  95                        return 1;
  96        }
  97        return 0;
  98}
  99
 100static int scsi_scan(struct Scsi_Host *shost, const char *str)
 101{
 102        char s1[15], s2[15], s3[15], junk;
 103        unsigned int channel, id, lun;
 104        int res;
 105
 106        res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 107        if (res != 3)
 108                return -EINVAL;
 109        if (check_set(&channel, s1))
 110                return -EINVAL;
 111        if (check_set(&id, s2))
 112                return -EINVAL;
 113        if (check_set(&lun, s3))
 114                return -EINVAL;
 115        if (shost->transportt->user_scan)
 116                res = shost->transportt->user_scan(shost, channel, id, lun);
 117        else
 118                res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 119        return res;
 120}
 121
 122/*
 123 * shost_show_function: macro to create an attr function that can be used to
 124 * show a non-bit field.
 125 */
 126#define shost_show_function(name, field, format_string)                 \
 127static ssize_t                                                          \
 128show_##name (struct device *dev, struct device_attribute *attr,         \
 129             char *buf)                                                 \
 130{                                                                       \
 131        struct Scsi_Host *shost = class_to_shost(dev);                  \
 132        return snprintf (buf, 20, format_string, shost->field);         \
 133}
 134
 135/*
 136 * shost_rd_attr: macro to create a function and attribute variable for a
 137 * read only field.
 138 */
 139#define shost_rd_attr2(name, field, format_string)                      \
 140        shost_show_function(name, field, format_string)                 \
 141static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 142
 143#define shost_rd_attr(field, format_string) \
 144shost_rd_attr2(field, field, format_string)
 145
 146/*
 147 * Create the actual show/store functions and data structures.
 148 */
 149
 150static ssize_t
 151store_scan(struct device *dev, struct device_attribute *attr,
 152           const char *buf, size_t count)
 153{
 154        struct Scsi_Host *shost = class_to_shost(dev);
 155        int res;
 156
 157        res = scsi_scan(shost, buf);
 158        if (res == 0)
 159                res = count;
 160        return res;
 161};
 162static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 163
 164static ssize_t
 165store_shost_state(struct device *dev, struct device_attribute *attr,
 166                  const char *buf, size_t count)
 167{
 168        int i;
 169        struct Scsi_Host *shost = class_to_shost(dev);
 170        enum scsi_host_state state = 0;
 171
 172        for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 173                const int len = strlen(shost_states[i].name);
 174                if (strncmp(shost_states[i].name, buf, len) == 0 &&
 175                   buf[len] == '\n') {
 176                        state = shost_states[i].value;
 177                        break;
 178                }
 179        }
 180        if (!state)
 181                return -EINVAL;
 182
 183        if (scsi_host_set_state(shost, state))
 184                return -EINVAL;
 185        return count;
 186}
 187
 188static ssize_t
 189show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 190{
 191        struct Scsi_Host *shost = class_to_shost(dev);
 192        const char *name = scsi_host_state_name(shost->shost_state);
 193
 194        if (!name)
 195                return -EINVAL;
 196
 197        return snprintf(buf, 20, "%s\n", name);
 198}
 199
 200/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 201struct device_attribute dev_attr_hstate =
 202        __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 203
 204static ssize_t
 205show_shost_mode(unsigned int mode, char *buf)
 206{
 207        ssize_t len = 0;
 208
 209        if (mode & MODE_INITIATOR)
 210                len = sprintf(buf, "%s", "Initiator");
 211
 212        if (mode & MODE_TARGET)
 213                len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 214
 215        len += sprintf(buf + len, "\n");
 216
 217        return len;
 218}
 219
 220static ssize_t
 221show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 222                          char *buf)
 223{
 224        struct Scsi_Host *shost = class_to_shost(dev);
 225        unsigned int supported_mode = shost->hostt->supported_mode;
 226
 227        if (supported_mode == MODE_UNKNOWN)
 228                /* by default this should be initiator */
 229                supported_mode = MODE_INITIATOR;
 230
 231        return show_shost_mode(supported_mode, buf);
 232}
 233
 234static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 235
 236static ssize_t
 237show_shost_active_mode(struct device *dev,
 238                       struct device_attribute *attr, char *buf)
 239{
 240        struct Scsi_Host *shost = class_to_shost(dev);
 241
 242        if (shost->active_mode == MODE_UNKNOWN)
 243                return snprintf(buf, 20, "unknown\n");
 244        else
 245                return show_shost_mode(shost->active_mode, buf);
 246}
 247
 248static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 249
 250static int check_reset_type(const char *str)
 251{
 252        if (sysfs_streq(str, "adapter"))
 253                return SCSI_ADAPTER_RESET;
 254        else if (sysfs_streq(str, "firmware"))
 255                return SCSI_FIRMWARE_RESET;
 256        else
 257                return 0;
 258}
 259
 260static ssize_t
 261store_host_reset(struct device *dev, struct device_attribute *attr,
 262                const char *buf, size_t count)
 263{
 264        struct Scsi_Host *shost = class_to_shost(dev);
 265        struct scsi_host_template *sht = shost->hostt;
 266        int ret = -EINVAL;
 267        int type;
 268
 269        type = check_reset_type(buf);
 270        if (!type)
 271                goto exit_store_host_reset;
 272
 273        if (sht->host_reset)
 274                ret = sht->host_reset(shost, type);
 275
 276exit_store_host_reset:
 277        if (ret == 0)
 278                ret = count;
 279        return ret;
 280}
 281
 282static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 283
 284shost_rd_attr(unique_id, "%u\n");
 285shost_rd_attr(host_busy, "%hu\n");
 286shost_rd_attr(cmd_per_lun, "%hd\n");
 287shost_rd_attr(can_queue, "%hd\n");
 288shost_rd_attr(sg_tablesize, "%hu\n");
 289shost_rd_attr(sg_prot_tablesize, "%hu\n");
 290shost_rd_attr(unchecked_isa_dma, "%d\n");
 291shost_rd_attr(prot_capabilities, "%u\n");
 292shost_rd_attr(prot_guard_type, "%hd\n");
 293shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 294
 295static struct attribute *scsi_sysfs_shost_attrs[] = {
 296        &dev_attr_unique_id.attr,
 297        &dev_attr_host_busy.attr,
 298        &dev_attr_cmd_per_lun.attr,
 299        &dev_attr_can_queue.attr,
 300        &dev_attr_sg_tablesize.attr,
 301        &dev_attr_sg_prot_tablesize.attr,
 302        &dev_attr_unchecked_isa_dma.attr,
 303        &dev_attr_proc_name.attr,
 304        &dev_attr_scan.attr,
 305        &dev_attr_hstate.attr,
 306        &dev_attr_supported_mode.attr,
 307        &dev_attr_active_mode.attr,
 308        &dev_attr_prot_capabilities.attr,
 309        &dev_attr_prot_guard_type.attr,
 310        &dev_attr_host_reset.attr,
 311        NULL
 312};
 313
 314struct attribute_group scsi_shost_attr_group = {
 315        .attrs =        scsi_sysfs_shost_attrs,
 316};
 317
 318const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 319        &scsi_shost_attr_group,
 320        NULL
 321};
 322
 323static void scsi_device_cls_release(struct device *class_dev)
 324{
 325        struct scsi_device *sdev;
 326
 327        sdev = class_to_sdev(class_dev);
 328        put_device(&sdev->sdev_gendev);
 329}
 330
 331static void scsi_device_dev_release_usercontext(struct work_struct *work)
 332{
 333        struct scsi_device *sdev;
 334        struct device *parent;
 335        struct scsi_target *starget;
 336        struct list_head *this, *tmp;
 337        unsigned long flags;
 338
 339        sdev = container_of(work, struct scsi_device, ew.work);
 340
 341        parent = sdev->sdev_gendev.parent;
 342        starget = to_scsi_target(parent);
 343
 344        spin_lock_irqsave(sdev->host->host_lock, flags);
 345        starget->reap_ref++;
 346        list_del(&sdev->siblings);
 347        list_del(&sdev->same_target_siblings);
 348        list_del(&sdev->starved_entry);
 349        spin_unlock_irqrestore(sdev->host->host_lock, flags);
 350
 351        cancel_work_sync(&sdev->event_work);
 352
 353        list_for_each_safe(this, tmp, &sdev->event_list) {
 354                struct scsi_event *evt;
 355
 356                evt = list_entry(this, struct scsi_event, node);
 357                list_del(&evt->node);
 358                kfree(evt);
 359        }
 360
 361        blk_put_queue(sdev->request_queue);
 362        /* NULL queue means the device can't be used */
 363        sdev->request_queue = NULL;
 364
 365        scsi_target_reap(scsi_target(sdev));
 366
 367        kfree(sdev->inquiry);
 368        kfree(sdev);
 369
 370        if (parent)
 371                put_device(parent);
 372}
 373
 374static void scsi_device_dev_release(struct device *dev)
 375{
 376        struct scsi_device *sdp = to_scsi_device(dev);
 377        execute_in_process_context(scsi_device_dev_release_usercontext,
 378                                   &sdp->ew);
 379}
 380
 381static struct class sdev_class = {
 382        .name           = "scsi_device",
 383        .dev_release    = scsi_device_cls_release,
 384};
 385
 386/* all probing is done in the individual ->probe routines */
 387static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 388{
 389        struct scsi_device *sdp;
 390
 391        if (dev->type != &scsi_dev_type)
 392                return 0;
 393
 394        sdp = to_scsi_device(dev);
 395        if (sdp->no_uld_attach)
 396                return 0;
 397        return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 398}
 399
 400static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 401{
 402        struct scsi_device *sdev;
 403
 404        if (dev->type != &scsi_dev_type)
 405                return 0;
 406
 407        sdev = to_scsi_device(dev);
 408
 409        add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 410        return 0;
 411}
 412
 413struct bus_type scsi_bus_type = {
 414        .name           = "scsi",
 415        .match          = scsi_bus_match,
 416        .uevent         = scsi_bus_uevent,
 417#ifdef CONFIG_PM
 418        .pm             = &scsi_bus_pm_ops,
 419#endif
 420};
 421EXPORT_SYMBOL_GPL(scsi_bus_type);
 422
 423int scsi_sysfs_register(void)
 424{
 425        int error;
 426
 427        error = bus_register(&scsi_bus_type);
 428        if (!error) {
 429                error = class_register(&sdev_class);
 430                if (error)
 431                        bus_unregister(&scsi_bus_type);
 432        }
 433
 434        return error;
 435}
 436
 437void scsi_sysfs_unregister(void)
 438{
 439        class_unregister(&sdev_class);
 440        bus_unregister(&scsi_bus_type);
 441}
 442
 443/*
 444 * sdev_show_function: macro to create an attr function that can be used to
 445 * show a non-bit field.
 446 */
 447#define sdev_show_function(field, format_string)                                \
 448static ssize_t                                                          \
 449sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 450                   char *buf)                                           \
 451{                                                                       \
 452        struct scsi_device *sdev;                                       \
 453        sdev = to_scsi_device(dev);                                     \
 454        return snprintf (buf, 20, format_string, sdev->field);          \
 455}                                                                       \
 456
 457/*
 458 * sdev_rd_attr: macro to create a function and attribute variable for a
 459 * read only field.
 460 */
 461#define sdev_rd_attr(field, format_string)                              \
 462        sdev_show_function(field, format_string)                        \
 463static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 464
 465
 466/*
 467 * sdev_rw_attr: create a function and attribute variable for a
 468 * read/write field.
 469 */
 470#define sdev_rw_attr(field, format_string)                              \
 471        sdev_show_function(field, format_string)                                \
 472                                                                        \
 473static ssize_t                                                          \
 474sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 475                    const char *buf, size_t count)                      \
 476{                                                                       \
 477        struct scsi_device *sdev;                                       \
 478        sdev = to_scsi_device(dev);                                     \
 479        sscanf (buf, format_string, &sdev->field);                      \
 480        return count;                                                   \
 481}                                                                       \
 482static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 483
 484/* Currently we don't export bit fields, but we might in future,
 485 * so leave this code in */
 486#if 0
 487/*
 488 * sdev_rd_attr: create a function and attribute variable for a
 489 * read/write bit field.
 490 */
 491#define sdev_rw_attr_bit(field)                                         \
 492        sdev_show_function(field, "%d\n")                                       \
 493                                                                        \
 494static ssize_t                                                          \
 495sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 496                    const char *buf, size_t count)                      \
 497{                                                                       \
 498        int ret;                                                        \
 499        struct scsi_device *sdev;                                       \
 500        ret = scsi_sdev_check_buf_bit(buf);                             \
 501        if (ret >= 0)   {                                               \
 502                sdev = to_scsi_device(dev);                             \
 503                sdev->field = ret;                                      \
 504                ret = count;                                            \
 505        }                                                               \
 506        return ret;                                                     \
 507}                                                                       \
 508static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 509
 510/*
 511 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 512 * else return -EINVAL.
 513 */
 514static int scsi_sdev_check_buf_bit(const char *buf)
 515{
 516        if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 517                if (buf[0] == '1')
 518                        return 1;
 519                else if (buf[0] == '0')
 520                        return 0;
 521                else 
 522                        return -EINVAL;
 523        } else
 524                return -EINVAL;
 525}
 526#endif
 527/*
 528 * Create the actual show/store functions and data structures.
 529 */
 530sdev_rd_attr (device_blocked, "%d\n");
 531sdev_rd_attr (queue_depth, "%d\n");
 532sdev_rd_attr (type, "%d\n");
 533sdev_rd_attr (scsi_level, "%d\n");
 534sdev_rd_attr (vendor, "%.8s\n");
 535sdev_rd_attr (model, "%.16s\n");
 536sdev_rd_attr (rev, "%.4s\n");
 537
 538/*
 539 * TODO: can we make these symlinks to the block layer ones?
 540 */
 541static ssize_t
 542sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 543{
 544        struct scsi_device *sdev;
 545        sdev = to_scsi_device(dev);
 546        return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 547}
 548
 549static ssize_t
 550sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 551                    const char *buf, size_t count)
 552{
 553        struct scsi_device *sdev;
 554        int timeout;
 555        sdev = to_scsi_device(dev);
 556        sscanf (buf, "%d\n", &timeout);
 557        blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 558        return count;
 559}
 560static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 561
 562static ssize_t
 563store_rescan_field (struct device *dev, struct device_attribute *attr,
 564                    const char *buf, size_t count)
 565{
 566        scsi_rescan_device(dev);
 567        return count;
 568}
 569static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 570
 571static void sdev_store_delete_callback(struct device *dev)
 572{
 573        scsi_remove_device(to_scsi_device(dev));
 574}
 575
 576static ssize_t
 577sdev_store_delete(struct device *dev, struct device_attribute *attr,
 578                  const char *buf, size_t count)
 579{
 580        int rc;
 581
 582        /* An attribute cannot be unregistered by one of its own methods,
 583         * so we have to use this roundabout approach.
 584         */
 585        rc = device_schedule_callback(dev, sdev_store_delete_callback);
 586        if (rc)
 587                count = rc;
 588        return count;
 589};
 590static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 591
 592static ssize_t
 593store_state_field(struct device *dev, struct device_attribute *attr,
 594                  const char *buf, size_t count)
 595{
 596        int i;
 597        struct scsi_device *sdev = to_scsi_device(dev);
 598        enum scsi_device_state state = 0;
 599
 600        for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 601                const int len = strlen(sdev_states[i].name);
 602                if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 603                   buf[len] == '\n') {
 604                        state = sdev_states[i].value;
 605                        break;
 606                }
 607        }
 608        if (!state)
 609                return -EINVAL;
 610
 611        if (scsi_device_set_state(sdev, state))
 612                return -EINVAL;
 613        return count;
 614}
 615
 616static ssize_t
 617show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 618{
 619        struct scsi_device *sdev = to_scsi_device(dev);
 620        const char *name = scsi_device_state_name(sdev->sdev_state);
 621
 622        if (!name)
 623                return -EINVAL;
 624
 625        return snprintf(buf, 20, "%s\n", name);
 626}
 627
 628static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 629
 630static ssize_t
 631show_queue_type_field(struct device *dev, struct device_attribute *attr,
 632                      char *buf)
 633{
 634        struct scsi_device *sdev = to_scsi_device(dev);
 635        const char *name = "none";
 636
 637        if (sdev->ordered_tags)
 638                name = "ordered";
 639        else if (sdev->simple_tags)
 640                name = "simple";
 641
 642        return snprintf(buf, 20, "%s\n", name);
 643}
 644
 645static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 646
 647static ssize_t
 648show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 649{
 650        return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 651}
 652
 653static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 654
 655#define show_sdev_iostat(field)                                         \
 656static ssize_t                                                          \
 657show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 658                    char *buf)                                          \
 659{                                                                       \
 660        struct scsi_device *sdev = to_scsi_device(dev);                 \
 661        unsigned long long count = atomic_read(&sdev->field);           \
 662        return snprintf(buf, 20, "0x%llx\n", count);                    \
 663}                                                                       \
 664static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 665
 666show_sdev_iostat(iorequest_cnt);
 667show_sdev_iostat(iodone_cnt);
 668show_sdev_iostat(ioerr_cnt);
 669
 670static ssize_t
 671sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 672{
 673        struct scsi_device *sdev;
 674        sdev = to_scsi_device(dev);
 675        return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 676}
 677static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 678
 679#define DECLARE_EVT_SHOW(name, Cap_name)                                \
 680static ssize_t                                                          \
 681sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 682                     char *buf)                                         \
 683{                                                                       \
 684        struct scsi_device *sdev = to_scsi_device(dev);                 \
 685        int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 686        return snprintf(buf, 20, "%d\n", val);                          \
 687}
 688
 689#define DECLARE_EVT_STORE(name, Cap_name)                               \
 690static ssize_t                                                          \
 691sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 692                      const char *buf, size_t count)                    \
 693{                                                                       \
 694        struct scsi_device *sdev = to_scsi_device(dev);                 \
 695        int val = simple_strtoul(buf, NULL, 0);                         \
 696        if (val == 0)                                                   \
 697                clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 698        else if (val == 1)                                              \
 699                set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 700        else                                                            \
 701                return -EINVAL;                                         \
 702        return count;                                                   \
 703}
 704
 705#define DECLARE_EVT(name, Cap_name)                                     \
 706        DECLARE_EVT_SHOW(name, Cap_name)                                \
 707        DECLARE_EVT_STORE(name, Cap_name)                               \
 708        static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 709                           sdev_store_evt_##name);
 710#define REF_EVT(name) &dev_attr_evt_##name.attr
 711
 712DECLARE_EVT(media_change, MEDIA_CHANGE)
 713
 714/* Default template for device attributes.  May NOT be modified */
 715static struct attribute *scsi_sdev_attrs[] = {
 716        &dev_attr_device_blocked.attr,
 717        &dev_attr_type.attr,
 718        &dev_attr_scsi_level.attr,
 719        &dev_attr_vendor.attr,
 720        &dev_attr_model.attr,
 721        &dev_attr_rev.attr,
 722        &dev_attr_rescan.attr,
 723        &dev_attr_delete.attr,
 724        &dev_attr_state.attr,
 725        &dev_attr_timeout.attr,
 726        &dev_attr_iocounterbits.attr,
 727        &dev_attr_iorequest_cnt.attr,
 728        &dev_attr_iodone_cnt.attr,
 729        &dev_attr_ioerr_cnt.attr,
 730        &dev_attr_modalias.attr,
 731        REF_EVT(media_change),
 732        NULL
 733};
 734
 735static struct attribute_group scsi_sdev_attr_group = {
 736        .attrs =        scsi_sdev_attrs,
 737};
 738
 739static const struct attribute_group *scsi_sdev_attr_groups[] = {
 740        &scsi_sdev_attr_group,
 741        NULL
 742};
 743
 744static ssize_t
 745sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 746                          const char *buf, size_t count)
 747{
 748        int depth, retval;
 749        struct scsi_device *sdev = to_scsi_device(dev);
 750        struct scsi_host_template *sht = sdev->host->hostt;
 751
 752        if (!sht->change_queue_depth)
 753                return -EINVAL;
 754
 755        depth = simple_strtoul(buf, NULL, 0);
 756
 757        if (depth < 1)
 758                return -EINVAL;
 759
 760        retval = sht->change_queue_depth(sdev, depth,
 761                                         SCSI_QDEPTH_DEFAULT);
 762        if (retval < 0)
 763                return retval;
 764
 765        sdev->max_queue_depth = sdev->queue_depth;
 766
 767        return count;
 768}
 769
 770static struct device_attribute sdev_attr_queue_depth_rw =
 771        __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 772               sdev_store_queue_depth_rw);
 773
 774static ssize_t
 775sdev_show_queue_ramp_up_period(struct device *dev,
 776                               struct device_attribute *attr,
 777                               char *buf)
 778{
 779        struct scsi_device *sdev;
 780        sdev = to_scsi_device(dev);
 781        return snprintf(buf, 20, "%u\n",
 782                        jiffies_to_msecs(sdev->queue_ramp_up_period));
 783}
 784
 785static ssize_t
 786sdev_store_queue_ramp_up_period(struct device *dev,
 787                                struct device_attribute *attr,
 788                                const char *buf, size_t count)
 789{
 790        struct scsi_device *sdev = to_scsi_device(dev);
 791        unsigned long period;
 792
 793        if (strict_strtoul(buf, 10, &period))
 794                return -EINVAL;
 795
 796        sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 797        return period;
 798}
 799
 800static struct device_attribute sdev_attr_queue_ramp_up_period =
 801        __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 802               sdev_show_queue_ramp_up_period,
 803               sdev_store_queue_ramp_up_period);
 804
 805static ssize_t
 806sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 807                         const char *buf, size_t count)
 808{
 809        struct scsi_device *sdev = to_scsi_device(dev);
 810        struct scsi_host_template *sht = sdev->host->hostt;
 811        int tag_type = 0, retval;
 812        int prev_tag_type = scsi_get_tag_type(sdev);
 813
 814        if (!sdev->tagged_supported || !sht->change_queue_type)
 815                return -EINVAL;
 816
 817        if (strncmp(buf, "ordered", 7) == 0)
 818                tag_type = MSG_ORDERED_TAG;
 819        else if (strncmp(buf, "simple", 6) == 0)
 820                tag_type = MSG_SIMPLE_TAG;
 821        else if (strncmp(buf, "none", 4) != 0)
 822                return -EINVAL;
 823
 824        if (tag_type == prev_tag_type)
 825                return count;
 826
 827        retval = sht->change_queue_type(sdev, tag_type);
 828        if (retval < 0)
 829                return retval;
 830
 831        return count;
 832}
 833
 834static int scsi_target_add(struct scsi_target *starget)
 835{
 836        int error;
 837
 838        if (starget->state != STARGET_CREATED)
 839                return 0;
 840
 841        error = device_add(&starget->dev);
 842        if (error) {
 843                dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 844                return error;
 845        }
 846        transport_add_device(&starget->dev);
 847        starget->state = STARGET_RUNNING;
 848
 849        pm_runtime_set_active(&starget->dev);
 850        pm_runtime_enable(&starget->dev);
 851        device_enable_async_suspend(&starget->dev);
 852
 853        return 0;
 854}
 855
 856static struct device_attribute sdev_attr_queue_type_rw =
 857        __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 858               sdev_store_queue_type_rw);
 859
 860/**
 861 * scsi_sysfs_add_sdev - add scsi device to sysfs
 862 * @sdev:       scsi_device to add
 863 *
 864 * Return value:
 865 *      0 on Success / non-zero on Failure
 866 **/
 867int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 868{
 869        int error, i;
 870        struct request_queue *rq = sdev->request_queue;
 871        struct scsi_target *starget = sdev->sdev_target;
 872
 873        error = scsi_device_set_state(sdev, SDEV_RUNNING);
 874        if (error)
 875                return error;
 876
 877        error = scsi_target_add(starget);
 878        if (error)
 879                return error;
 880
 881        transport_configure_device(&starget->dev);
 882
 883        device_enable_async_suspend(&sdev->sdev_gendev);
 884        scsi_autopm_get_target(starget);
 885        pm_runtime_set_active(&sdev->sdev_gendev);
 886        pm_runtime_forbid(&sdev->sdev_gendev);
 887        pm_runtime_enable(&sdev->sdev_gendev);
 888        scsi_autopm_put_target(starget);
 889
 890        /* The following call will keep sdev active indefinitely, until
 891         * its driver does a corresponding scsi_autopm_pm_device().  Only
 892         * drivers supporting autosuspend will do this.
 893         */
 894        scsi_autopm_get_device(sdev);
 895
 896        error = device_add(&sdev->sdev_gendev);
 897        if (error) {
 898                sdev_printk(KERN_INFO, sdev,
 899                                "failed to add device: %d\n", error);
 900                return error;
 901        }
 902        device_enable_async_suspend(&sdev->sdev_dev);
 903        error = device_add(&sdev->sdev_dev);
 904        if (error) {
 905                sdev_printk(KERN_INFO, sdev,
 906                                "failed to add class device: %d\n", error);
 907                device_del(&sdev->sdev_gendev);
 908                return error;
 909        }
 910        transport_add_device(&sdev->sdev_gendev);
 911        sdev->is_visible = 1;
 912
 913        /* create queue files, which may be writable, depending on the host */
 914        if (sdev->host->hostt->change_queue_depth) {
 915                error = device_create_file(&sdev->sdev_gendev,
 916                                           &sdev_attr_queue_depth_rw);
 917                error = device_create_file(&sdev->sdev_gendev,
 918                                           &sdev_attr_queue_ramp_up_period);
 919        }
 920        else
 921                error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 922        if (error)
 923                return error;
 924
 925        if (sdev->host->hostt->change_queue_type)
 926                error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 927        else
 928                error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 929        if (error)
 930                return error;
 931
 932        error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 933
 934        if (error)
 935                /* we're treating error on bsg register as non-fatal,
 936                 * so pretend nothing went wrong */
 937                sdev_printk(KERN_INFO, sdev,
 938                            "Failed to register bsg queue, errno=%d\n", error);
 939
 940        /* add additional host specific attributes */
 941        if (sdev->host->hostt->sdev_attrs) {
 942                for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 943                        error = device_create_file(&sdev->sdev_gendev,
 944                                        sdev->host->hostt->sdev_attrs[i]);
 945                        if (error)
 946                                return error;
 947                }
 948        }
 949
 950        return error;
 951}
 952
 953void __scsi_remove_device(struct scsi_device *sdev)
 954{
 955        struct device *dev = &sdev->sdev_gendev;
 956
 957        if (sdev->is_visible) {
 958                if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 959                        return;
 960
 961                bsg_unregister_queue(sdev->request_queue);
 962                device_unregister(&sdev->sdev_dev);
 963                transport_remove_device(dev);
 964                device_del(dev);
 965        } else
 966                put_device(&sdev->sdev_dev);
 967
 968        /*
 969         * Stop accepting new requests and wait until all queuecommand() and
 970         * scsi_run_queue() invocations have finished before tearing down the
 971         * device.
 972         */
 973        scsi_device_set_state(sdev, SDEV_DEL);
 974        blk_cleanup_queue(sdev->request_queue);
 975        cancel_work_sync(&sdev->requeue_work);
 976
 977        if (sdev->host->hostt->slave_destroy)
 978                sdev->host->hostt->slave_destroy(sdev);
 979        transport_destroy_device(dev);
 980
 981        put_device(dev);
 982}
 983
 984/**
 985 * scsi_remove_device - unregister a device from the scsi bus
 986 * @sdev:       scsi_device to unregister
 987 **/
 988void scsi_remove_device(struct scsi_device *sdev)
 989{
 990        struct Scsi_Host *shost = sdev->host;
 991
 992        mutex_lock(&shost->scan_mutex);
 993        __scsi_remove_device(sdev);
 994        mutex_unlock(&shost->scan_mutex);
 995}
 996EXPORT_SYMBOL(scsi_remove_device);
 997
 998static void __scsi_remove_target(struct scsi_target *starget)
 999{
1000        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1001        unsigned long flags;
1002        struct scsi_device *sdev;
1003
1004        spin_lock_irqsave(shost->host_lock, flags);
1005 restart:
1006        list_for_each_entry(sdev, &shost->__devices, siblings) {
1007                if (sdev->channel != starget->channel ||
1008                    sdev->id != starget->id ||
1009                    scsi_device_get(sdev))
1010                        continue;
1011                spin_unlock_irqrestore(shost->host_lock, flags);
1012                scsi_remove_device(sdev);
1013                scsi_device_put(sdev);
1014                spin_lock_irqsave(shost->host_lock, flags);
1015                goto restart;
1016        }
1017        spin_unlock_irqrestore(shost->host_lock, flags);
1018}
1019
1020/**
1021 * scsi_remove_target - try to remove a target and all its devices
1022 * @dev: generic starget or parent of generic stargets to be removed
1023 *
1024 * Note: This is slightly racy.  It is possible that if the user
1025 * requests the addition of another device then the target won't be
1026 * removed.
1027 */
1028void scsi_remove_target(struct device *dev)
1029{
1030        struct Scsi_Host *shost = dev_to_shost(dev->parent);
1031        struct scsi_target *starget, *last = NULL;
1032        unsigned long flags;
1033
1034        /* remove targets being careful to lookup next entry before
1035         * deleting the last
1036         */
1037        spin_lock_irqsave(shost->host_lock, flags);
1038        list_for_each_entry(starget, &shost->__targets, siblings) {
1039                if (starget->state == STARGET_DEL)
1040                        continue;
1041                if (starget->dev.parent == dev || &starget->dev == dev) {
1042                        /* assuming new targets arrive at the end */
1043                        starget->reap_ref++;
1044                        spin_unlock_irqrestore(shost->host_lock, flags);
1045                        if (last)
1046                                scsi_target_reap(last);
1047                        last = starget;
1048                        __scsi_remove_target(starget);
1049                        spin_lock_irqsave(shost->host_lock, flags);
1050                }
1051        }
1052        spin_unlock_irqrestore(shost->host_lock, flags);
1053
1054        if (last)
1055                scsi_target_reap(last);
1056}
1057EXPORT_SYMBOL(scsi_remove_target);
1058
1059int scsi_register_driver(struct device_driver *drv)
1060{
1061        drv->bus = &scsi_bus_type;
1062
1063        return driver_register(drv);
1064}
1065EXPORT_SYMBOL(scsi_register_driver);
1066
1067int scsi_register_interface(struct class_interface *intf)
1068{
1069        intf->class = &sdev_class;
1070
1071        return class_interface_register(intf);
1072}
1073EXPORT_SYMBOL(scsi_register_interface);
1074
1075/**
1076 * scsi_sysfs_add_host - add scsi host to subsystem
1077 * @shost:     scsi host struct to add to subsystem
1078 **/
1079int scsi_sysfs_add_host(struct Scsi_Host *shost)
1080{
1081        int error, i;
1082
1083        /* add host specific attributes */
1084        if (shost->hostt->shost_attrs) {
1085                for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1086                        error = device_create_file(&shost->shost_dev,
1087                                        shost->hostt->shost_attrs[i]);
1088                        if (error)
1089                                return error;
1090                }
1091        }
1092
1093        transport_register_device(&shost->shost_gendev);
1094        transport_configure_device(&shost->shost_gendev);
1095        return 0;
1096}
1097
1098static struct device_type scsi_dev_type = {
1099        .name =         "scsi_device",
1100        .release =      scsi_device_dev_release,
1101        .groups =       scsi_sdev_attr_groups,
1102};
1103
1104void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1105{
1106        unsigned long flags;
1107        struct Scsi_Host *shost = sdev->host;
1108        struct scsi_target  *starget = sdev->sdev_target;
1109
1110        device_initialize(&sdev->sdev_gendev);
1111        sdev->sdev_gendev.bus = &scsi_bus_type;
1112        sdev->sdev_gendev.type = &scsi_dev_type;
1113        dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1114                     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1115
1116        device_initialize(&sdev->sdev_dev);
1117        sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1118        sdev->sdev_dev.class = &sdev_class;
1119        dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1120                     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1121        sdev->scsi_level = starget->scsi_level;
1122        transport_setup_device(&sdev->sdev_gendev);
1123        spin_lock_irqsave(shost->host_lock, flags);
1124        list_add_tail(&sdev->same_target_siblings, &starget->devices);
1125        list_add_tail(&sdev->siblings, &shost->__devices);
1126        spin_unlock_irqrestore(shost->host_lock, flags);
1127}
1128
1129int scsi_is_sdev_device(const struct device *dev)
1130{
1131        return dev->type == &scsi_dev_type;
1132}
1133EXPORT_SYMBOL(scsi_is_sdev_device);
1134
1135/* A blank transport template that is used in drivers that don't
1136 * yet implement Transport Attributes */
1137struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
1138
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