linux/drivers/scsi/scsi_sysfs.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * scsi_sysfs.c
   4 *
   5 * SCSI sysfs interface routines.
   6 *
   7 * Created to pull SCSI mid layer sysfs routines into one file.
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/slab.h>
  12#include <linux/init.h>
  13#include <linux/blkdev.h>
  14#include <linux/device.h>
  15#include <linux/pm_runtime.h>
  16
  17#include <scsi/scsi.h>
  18#include <scsi/scsi_device.h>
  19#include <scsi/scsi_host.h>
  20#include <scsi/scsi_tcq.h>
  21#include <scsi/scsi_dh.h>
  22#include <scsi/scsi_transport.h>
  23#include <scsi/scsi_driver.h>
  24#include <scsi/scsi_devinfo.h>
  25
  26#include "scsi_priv.h"
  27#include "scsi_logging.h"
  28
  29static struct device_type scsi_dev_type;
  30
  31static const struct {
  32        enum scsi_device_state  value;
  33        char                    *name;
  34} sdev_states[] = {
  35        { SDEV_CREATED, "created" },
  36        { SDEV_RUNNING, "running" },
  37        { SDEV_CANCEL, "cancel" },
  38        { SDEV_DEL, "deleted" },
  39        { SDEV_QUIESCE, "quiesce" },
  40        { SDEV_OFFLINE, "offline" },
  41        { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  42        { SDEV_BLOCK,   "blocked" },
  43        { SDEV_CREATED_BLOCK, "created-blocked" },
  44};
  45
  46const char *scsi_device_state_name(enum scsi_device_state state)
  47{
  48        int i;
  49        char *name = NULL;
  50
  51        for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  52                if (sdev_states[i].value == state) {
  53                        name = sdev_states[i].name;
  54                        break;
  55                }
  56        }
  57        return name;
  58}
  59
  60static const struct {
  61        enum scsi_host_state    value;
  62        char                    *name;
  63} shost_states[] = {
  64        { SHOST_CREATED, "created" },
  65        { SHOST_RUNNING, "running" },
  66        { SHOST_CANCEL, "cancel" },
  67        { SHOST_DEL, "deleted" },
  68        { SHOST_RECOVERY, "recovery" },
  69        { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  70        { SHOST_DEL_RECOVERY, "deleted/recovery", },
  71};
  72const char *scsi_host_state_name(enum scsi_host_state state)
  73{
  74        int i;
  75        char *name = NULL;
  76
  77        for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  78                if (shost_states[i].value == state) {
  79                        name = shost_states[i].name;
  80                        break;
  81                }
  82        }
  83        return name;
  84}
  85
  86#ifdef CONFIG_SCSI_DH
  87static const struct {
  88        unsigned char   value;
  89        char            *name;
  90} sdev_access_states[] = {
  91        { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
  92        { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
  93        { SCSI_ACCESS_STATE_STANDBY, "standby" },
  94        { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
  95        { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
  96        { SCSI_ACCESS_STATE_OFFLINE, "offline" },
  97        { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
  98};
  99
 100static const char *scsi_access_state_name(unsigned char state)
 101{
 102        int i;
 103        char *name = NULL;
 104
 105        for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
 106                if (sdev_access_states[i].value == state) {
 107                        name = sdev_access_states[i].name;
 108                        break;
 109                }
 110        }
 111        return name;
 112}
 113#endif
 114
 115static int check_set(unsigned long long *val, char *src)
 116{
 117        char *last;
 118
 119        if (strcmp(src, "-") == 0) {
 120                *val = SCAN_WILD_CARD;
 121        } else {
 122                /*
 123                 * Doesn't check for int overflow
 124                 */
 125                *val = simple_strtoull(src, &last, 0);
 126                if (*last != '\0')
 127                        return 1;
 128        }
 129        return 0;
 130}
 131
 132static int scsi_scan(struct Scsi_Host *shost, const char *str)
 133{
 134        char s1[15], s2[15], s3[17], junk;
 135        unsigned long long channel, id, lun;
 136        int res;
 137
 138        res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
 139        if (res != 3)
 140                return -EINVAL;
 141        if (check_set(&channel, s1))
 142                return -EINVAL;
 143        if (check_set(&id, s2))
 144                return -EINVAL;
 145        if (check_set(&lun, s3))
 146                return -EINVAL;
 147        if (shost->transportt->user_scan)
 148                res = shost->transportt->user_scan(shost, channel, id, lun);
 149        else
 150                res = scsi_scan_host_selected(shost, channel, id, lun,
 151                                              SCSI_SCAN_MANUAL);
 152        return res;
 153}
 154
 155/*
 156 * shost_show_function: macro to create an attr function that can be used to
 157 * show a non-bit field.
 158 */
 159#define shost_show_function(name, field, format_string)                 \
 160static ssize_t                                                          \
 161show_##name (struct device *dev, struct device_attribute *attr,         \
 162             char *buf)                                                 \
 163{                                                                       \
 164        struct Scsi_Host *shost = class_to_shost(dev);                  \
 165        return snprintf (buf, 20, format_string, shost->field);         \
 166}
 167
 168/*
 169 * shost_rd_attr: macro to create a function and attribute variable for a
 170 * read only field.
 171 */
 172#define shost_rd_attr2(name, field, format_string)                      \
 173        shost_show_function(name, field, format_string)                 \
 174static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 175
 176#define shost_rd_attr(field, format_string) \
 177shost_rd_attr2(field, field, format_string)
 178
 179/*
 180 * Create the actual show/store functions and data structures.
 181 */
 182
 183static ssize_t
 184store_scan(struct device *dev, struct device_attribute *attr,
 185           const char *buf, size_t count)
 186{
 187        struct Scsi_Host *shost = class_to_shost(dev);
 188        int res;
 189
 190        res = scsi_scan(shost, buf);
 191        if (res == 0)
 192                res = count;
 193        return res;
 194};
 195static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 196
 197static ssize_t
 198store_shost_state(struct device *dev, struct device_attribute *attr,
 199                  const char *buf, size_t count)
 200{
 201        int i;
 202        struct Scsi_Host *shost = class_to_shost(dev);
 203        enum scsi_host_state state = 0;
 204
 205        for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 206                const int len = strlen(shost_states[i].name);
 207                if (strncmp(shost_states[i].name, buf, len) == 0 &&
 208                   buf[len] == '\n') {
 209                        state = shost_states[i].value;
 210                        break;
 211                }
 212        }
 213        if (!state)
 214                return -EINVAL;
 215
 216        if (scsi_host_set_state(shost, state))
 217                return -EINVAL;
 218        return count;
 219}
 220
 221static ssize_t
 222show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 223{
 224        struct Scsi_Host *shost = class_to_shost(dev);
 225        const char *name = scsi_host_state_name(shost->shost_state);
 226
 227        if (!name)
 228                return -EINVAL;
 229
 230        return snprintf(buf, 20, "%s\n", name);
 231}
 232
 233/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 234static struct device_attribute dev_attr_hstate =
 235        __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 236
 237static ssize_t
 238show_shost_mode(unsigned int mode, char *buf)
 239{
 240        ssize_t len = 0;
 241
 242        if (mode & MODE_INITIATOR)
 243                len = sprintf(buf, "%s", "Initiator");
 244
 245        if (mode & MODE_TARGET)
 246                len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 247
 248        len += sprintf(buf + len, "\n");
 249
 250        return len;
 251}
 252
 253static ssize_t
 254show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 255                          char *buf)
 256{
 257        struct Scsi_Host *shost = class_to_shost(dev);
 258        unsigned int supported_mode = shost->hostt->supported_mode;
 259
 260        if (supported_mode == MODE_UNKNOWN)
 261                /* by default this should be initiator */
 262                supported_mode = MODE_INITIATOR;
 263
 264        return show_shost_mode(supported_mode, buf);
 265}
 266
 267static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 268
 269static ssize_t
 270show_shost_active_mode(struct device *dev,
 271                       struct device_attribute *attr, char *buf)
 272{
 273        struct Scsi_Host *shost = class_to_shost(dev);
 274
 275        if (shost->active_mode == MODE_UNKNOWN)
 276                return snprintf(buf, 20, "unknown\n");
 277        else
 278                return show_shost_mode(shost->active_mode, buf);
 279}
 280
 281static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 282
 283static int check_reset_type(const char *str)
 284{
 285        if (sysfs_streq(str, "adapter"))
 286                return SCSI_ADAPTER_RESET;
 287        else if (sysfs_streq(str, "firmware"))
 288                return SCSI_FIRMWARE_RESET;
 289        else
 290                return 0;
 291}
 292
 293static ssize_t
 294store_host_reset(struct device *dev, struct device_attribute *attr,
 295                const char *buf, size_t count)
 296{
 297        struct Scsi_Host *shost = class_to_shost(dev);
 298        struct scsi_host_template *sht = shost->hostt;
 299        int ret = -EINVAL;
 300        int type;
 301
 302        type = check_reset_type(buf);
 303        if (!type)
 304                goto exit_store_host_reset;
 305
 306        if (sht->host_reset)
 307                ret = sht->host_reset(shost, type);
 308        else
 309                ret = -EOPNOTSUPP;
 310
 311exit_store_host_reset:
 312        if (ret == 0)
 313                ret = count;
 314        return ret;
 315}
 316
 317static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 318
 319static ssize_t
 320show_shost_eh_deadline(struct device *dev,
 321                      struct device_attribute *attr, char *buf)
 322{
 323        struct Scsi_Host *shost = class_to_shost(dev);
 324
 325        if (shost->eh_deadline == -1)
 326                return snprintf(buf, strlen("off") + 2, "off\n");
 327        return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
 328}
 329
 330static ssize_t
 331store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 332                const char *buf, size_t count)
 333{
 334        struct Scsi_Host *shost = class_to_shost(dev);
 335        int ret = -EINVAL;
 336        unsigned long deadline, flags;
 337
 338        if (shost->transportt &&
 339            (shost->transportt->eh_strategy_handler ||
 340             !shost->hostt->eh_host_reset_handler))
 341                return ret;
 342
 343        if (!strncmp(buf, "off", strlen("off")))
 344                deadline = -1;
 345        else {
 346                ret = kstrtoul(buf, 10, &deadline);
 347                if (ret)
 348                        return ret;
 349                if (deadline * HZ > UINT_MAX)
 350                        return -EINVAL;
 351        }
 352
 353        spin_lock_irqsave(shost->host_lock, flags);
 354        if (scsi_host_in_recovery(shost))
 355                ret = -EBUSY;
 356        else {
 357                if (deadline == -1)
 358                        shost->eh_deadline = -1;
 359                else
 360                        shost->eh_deadline = deadline * HZ;
 361
 362                ret = count;
 363        }
 364        spin_unlock_irqrestore(shost->host_lock, flags);
 365
 366        return ret;
 367}
 368
 369static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 370
 371shost_rd_attr(unique_id, "%u\n");
 372shost_rd_attr(cmd_per_lun, "%hd\n");
 373shost_rd_attr(can_queue, "%d\n");
 374shost_rd_attr(sg_tablesize, "%hu\n");
 375shost_rd_attr(sg_prot_tablesize, "%hu\n");
 376shost_rd_attr(prot_capabilities, "%u\n");
 377shost_rd_attr(prot_guard_type, "%hd\n");
 378shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 379
 380static ssize_t
 381show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
 382{
 383        struct Scsi_Host *shost = class_to_shost(dev);
 384        return snprintf(buf, 20, "%d\n", scsi_host_busy(shost));
 385}
 386static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
 387
 388static ssize_t
 389show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
 390{
 391        return sprintf(buf, "1\n");
 392}
 393static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
 394
 395static ssize_t
 396show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf)
 397{
 398        struct Scsi_Host *shost = class_to_shost(dev);
 399        struct blk_mq_tag_set *tag_set = &shost->tag_set;
 400
 401        return snprintf(buf, 20, "%d\n", tag_set->nr_hw_queues);
 402}
 403static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL);
 404
 405static struct attribute *scsi_sysfs_shost_attrs[] = {
 406        &dev_attr_use_blk_mq.attr,
 407        &dev_attr_unique_id.attr,
 408        &dev_attr_host_busy.attr,
 409        &dev_attr_cmd_per_lun.attr,
 410        &dev_attr_can_queue.attr,
 411        &dev_attr_sg_tablesize.attr,
 412        &dev_attr_sg_prot_tablesize.attr,
 413        &dev_attr_proc_name.attr,
 414        &dev_attr_scan.attr,
 415        &dev_attr_hstate.attr,
 416        &dev_attr_supported_mode.attr,
 417        &dev_attr_active_mode.attr,
 418        &dev_attr_prot_capabilities.attr,
 419        &dev_attr_prot_guard_type.attr,
 420        &dev_attr_host_reset.attr,
 421        &dev_attr_eh_deadline.attr,
 422        &dev_attr_nr_hw_queues.attr,
 423        NULL
 424};
 425
 426static struct attribute_group scsi_shost_attr_group = {
 427        .attrs =        scsi_sysfs_shost_attrs,
 428};
 429
 430const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 431        &scsi_shost_attr_group,
 432        NULL
 433};
 434
 435static void scsi_device_cls_release(struct device *class_dev)
 436{
 437        struct scsi_device *sdev;
 438
 439        sdev = class_to_sdev(class_dev);
 440        put_device(&sdev->sdev_gendev);
 441}
 442
 443static void scsi_device_dev_release_usercontext(struct work_struct *work)
 444{
 445        struct scsi_device *sdev;
 446        struct device *parent;
 447        struct list_head *this, *tmp;
 448        struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 449        struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
 450        unsigned long flags;
 451
 452        sdev = container_of(work, struct scsi_device, ew.work);
 453
 454        scsi_dh_release_device(sdev);
 455
 456        parent = sdev->sdev_gendev.parent;
 457
 458        spin_lock_irqsave(sdev->host->host_lock, flags);
 459        list_del(&sdev->siblings);
 460        list_del(&sdev->same_target_siblings);
 461        list_del(&sdev->starved_entry);
 462        spin_unlock_irqrestore(sdev->host->host_lock, flags);
 463
 464        cancel_work_sync(&sdev->event_work);
 465
 466        list_for_each_safe(this, tmp, &sdev->event_list) {
 467                struct scsi_event *evt;
 468
 469                evt = list_entry(this, struct scsi_event, node);
 470                list_del(&evt->node);
 471                kfree(evt);
 472        }
 473
 474        blk_put_queue(sdev->request_queue);
 475        /* NULL queue means the device can't be used */
 476        sdev->request_queue = NULL;
 477
 478        sbitmap_free(&sdev->budget_map);
 479
 480        mutex_lock(&sdev->inquiry_mutex);
 481        vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 482                                       lockdep_is_held(&sdev->inquiry_mutex));
 483        vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 484                                       lockdep_is_held(&sdev->inquiry_mutex));
 485        vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 486                                       lockdep_is_held(&sdev->inquiry_mutex));
 487        vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 488                                       lockdep_is_held(&sdev->inquiry_mutex));
 489        mutex_unlock(&sdev->inquiry_mutex);
 490
 491        if (vpd_pg0)
 492                kfree_rcu(vpd_pg0, rcu);
 493        if (vpd_pg83)
 494                kfree_rcu(vpd_pg83, rcu);
 495        if (vpd_pg80)
 496                kfree_rcu(vpd_pg80, rcu);
 497        if (vpd_pg89)
 498                kfree_rcu(vpd_pg89, rcu);
 499        kfree(sdev->inquiry);
 500        kfree(sdev);
 501
 502        if (parent)
 503                put_device(parent);
 504}
 505
 506static void scsi_device_dev_release(struct device *dev)
 507{
 508        struct scsi_device *sdp = to_scsi_device(dev);
 509        execute_in_process_context(scsi_device_dev_release_usercontext,
 510                                   &sdp->ew);
 511}
 512
 513static struct class sdev_class = {
 514        .name           = "scsi_device",
 515        .dev_release    = scsi_device_cls_release,
 516};
 517
 518/* all probing is done in the individual ->probe routines */
 519static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 520{
 521        struct scsi_device *sdp;
 522
 523        if (dev->type != &scsi_dev_type)
 524                return 0;
 525
 526        sdp = to_scsi_device(dev);
 527        if (sdp->no_uld_attach)
 528                return 0;
 529        return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 530}
 531
 532static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 533{
 534        struct scsi_device *sdev;
 535
 536        if (dev->type != &scsi_dev_type)
 537                return 0;
 538
 539        sdev = to_scsi_device(dev);
 540
 541        add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 542        return 0;
 543}
 544
 545struct bus_type scsi_bus_type = {
 546        .name           = "scsi",
 547        .match          = scsi_bus_match,
 548        .uevent         = scsi_bus_uevent,
 549#ifdef CONFIG_PM
 550        .pm             = &scsi_bus_pm_ops,
 551#endif
 552};
 553EXPORT_SYMBOL_GPL(scsi_bus_type);
 554
 555int scsi_sysfs_register(void)
 556{
 557        int error;
 558
 559        error = bus_register(&scsi_bus_type);
 560        if (!error) {
 561                error = class_register(&sdev_class);
 562                if (error)
 563                        bus_unregister(&scsi_bus_type);
 564        }
 565
 566        return error;
 567}
 568
 569void scsi_sysfs_unregister(void)
 570{
 571        class_unregister(&sdev_class);
 572        bus_unregister(&scsi_bus_type);
 573}
 574
 575/*
 576 * sdev_show_function: macro to create an attr function that can be used to
 577 * show a non-bit field.
 578 */
 579#define sdev_show_function(field, format_string)                                \
 580static ssize_t                                                          \
 581sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 582                   char *buf)                                           \
 583{                                                                       \
 584        struct scsi_device *sdev;                                       \
 585        sdev = to_scsi_device(dev);                                     \
 586        return snprintf (buf, 20, format_string, sdev->field);          \
 587}                                                                       \
 588
 589/*
 590 * sdev_rd_attr: macro to create a function and attribute variable for a
 591 * read only field.
 592 */
 593#define sdev_rd_attr(field, format_string)                              \
 594        sdev_show_function(field, format_string)                        \
 595static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 596
 597
 598/*
 599 * sdev_rw_attr: create a function and attribute variable for a
 600 * read/write field.
 601 */
 602#define sdev_rw_attr(field, format_string)                              \
 603        sdev_show_function(field, format_string)                                \
 604                                                                        \
 605static ssize_t                                                          \
 606sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 607                    const char *buf, size_t count)                      \
 608{                                                                       \
 609        struct scsi_device *sdev;                                       \
 610        sdev = to_scsi_device(dev);                                     \
 611        sscanf (buf, format_string, &sdev->field);                      \
 612        return count;                                                   \
 613}                                                                       \
 614static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 615
 616/* Currently we don't export bit fields, but we might in future,
 617 * so leave this code in */
 618#if 0
 619/*
 620 * sdev_rd_attr: create a function and attribute variable for a
 621 * read/write bit field.
 622 */
 623#define sdev_rw_attr_bit(field)                                         \
 624        sdev_show_function(field, "%d\n")                                       \
 625                                                                        \
 626static ssize_t                                                          \
 627sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 628                    const char *buf, size_t count)                      \
 629{                                                                       \
 630        int ret;                                                        \
 631        struct scsi_device *sdev;                                       \
 632        ret = scsi_sdev_check_buf_bit(buf);                             \
 633        if (ret >= 0)   {                                               \
 634                sdev = to_scsi_device(dev);                             \
 635                sdev->field = ret;                                      \
 636                ret = count;                                            \
 637        }                                                               \
 638        return ret;                                                     \
 639}                                                                       \
 640static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 641
 642/*
 643 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 644 * else return -EINVAL.
 645 */
 646static int scsi_sdev_check_buf_bit(const char *buf)
 647{
 648        if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 649                if (buf[0] == '1')
 650                        return 1;
 651                else if (buf[0] == '0')
 652                        return 0;
 653                else 
 654                        return -EINVAL;
 655        } else
 656                return -EINVAL;
 657}
 658#endif
 659/*
 660 * Create the actual show/store functions and data structures.
 661 */
 662sdev_rd_attr (type, "%d\n");
 663sdev_rd_attr (scsi_level, "%d\n");
 664sdev_rd_attr (vendor, "%.8s\n");
 665sdev_rd_attr (model, "%.16s\n");
 666sdev_rd_attr (rev, "%.4s\n");
 667
 668static ssize_t
 669sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 670                char *buf)
 671{
 672        struct scsi_device *sdev = to_scsi_device(dev);
 673        return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 674}
 675static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 676
 677static ssize_t
 678sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 679                char *buf)
 680{
 681        struct scsi_device *sdev = to_scsi_device(dev);
 682        return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 683}
 684static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 685
 686/*
 687 * TODO: can we make these symlinks to the block layer ones?
 688 */
 689static ssize_t
 690sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 691{
 692        struct scsi_device *sdev;
 693        sdev = to_scsi_device(dev);
 694        return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 695}
 696
 697static ssize_t
 698sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 699                    const char *buf, size_t count)
 700{
 701        struct scsi_device *sdev;
 702        int timeout;
 703        sdev = to_scsi_device(dev);
 704        sscanf (buf, "%d\n", &timeout);
 705        blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 706        return count;
 707}
 708static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 709
 710static ssize_t
 711sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 712{
 713        struct scsi_device *sdev;
 714        sdev = to_scsi_device(dev);
 715        return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 716}
 717
 718static ssize_t
 719sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 720                    const char *buf, size_t count)
 721{
 722        struct scsi_device *sdev;
 723        unsigned int eh_timeout;
 724        int err;
 725
 726        if (!capable(CAP_SYS_ADMIN))
 727                return -EACCES;
 728
 729        sdev = to_scsi_device(dev);
 730        err = kstrtouint(buf, 10, &eh_timeout);
 731        if (err)
 732                return err;
 733        sdev->eh_timeout = eh_timeout * HZ;
 734
 735        return count;
 736}
 737static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 738
 739static ssize_t
 740store_rescan_field (struct device *dev, struct device_attribute *attr,
 741                    const char *buf, size_t count)
 742{
 743        scsi_rescan_device(dev);
 744        return count;
 745}
 746static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 747
 748static ssize_t
 749sdev_store_delete(struct device *dev, struct device_attribute *attr,
 750                  const char *buf, size_t count)
 751{
 752        struct kernfs_node *kn;
 753        struct scsi_device *sdev = to_scsi_device(dev);
 754
 755        /*
 756         * We need to try to get module, avoiding the module been removed
 757         * during delete.
 758         */
 759        if (scsi_device_get(sdev))
 760                return -ENODEV;
 761
 762        kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 763        WARN_ON_ONCE(!kn);
 764        /*
 765         * Concurrent writes into the "delete" sysfs attribute may trigger
 766         * concurrent calls to device_remove_file() and scsi_remove_device().
 767         * device_remove_file() handles concurrent removal calls by
 768         * serializing these and by ignoring the second and later removal
 769         * attempts.  Concurrent calls of scsi_remove_device() are
 770         * serialized. The second and later calls of scsi_remove_device() are
 771         * ignored because the first call of that function changes the device
 772         * state into SDEV_DEL.
 773         */
 774        device_remove_file(dev, attr);
 775        scsi_remove_device(sdev);
 776        if (kn)
 777                sysfs_unbreak_active_protection(kn);
 778        scsi_device_put(sdev);
 779        return count;
 780};
 781static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 782
 783static ssize_t
 784store_state_field(struct device *dev, struct device_attribute *attr,
 785                  const char *buf, size_t count)
 786{
 787        int i, ret;
 788        struct scsi_device *sdev = to_scsi_device(dev);
 789        enum scsi_device_state state = 0;
 790
 791        for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 792                const int len = strlen(sdev_states[i].name);
 793                if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 794                   buf[len] == '\n') {
 795                        state = sdev_states[i].value;
 796                        break;
 797                }
 798        }
 799        switch (state) {
 800        case SDEV_RUNNING:
 801        case SDEV_OFFLINE:
 802                break;
 803        default:
 804                return -EINVAL;
 805        }
 806
 807        mutex_lock(&sdev->state_mutex);
 808        ret = scsi_device_set_state(sdev, state);
 809        /*
 810         * If the device state changes to SDEV_RUNNING, we need to
 811         * run the queue to avoid I/O hang, and rescan the device
 812         * to revalidate it. Running the queue first is necessary
 813         * because another thread may be waiting inside
 814         * blk_mq_freeze_queue_wait() and because that call may be
 815         * waiting for pending I/O to finish.
 816         */
 817        if (ret == 0 && state == SDEV_RUNNING) {
 818                blk_mq_run_hw_queues(sdev->request_queue, true);
 819                scsi_rescan_device(dev);
 820        }
 821        mutex_unlock(&sdev->state_mutex);
 822
 823        return ret == 0 ? count : -EINVAL;
 824}
 825
 826static ssize_t
 827show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 828{
 829        struct scsi_device *sdev = to_scsi_device(dev);
 830        const char *name = scsi_device_state_name(sdev->sdev_state);
 831
 832        if (!name)
 833                return -EINVAL;
 834
 835        return snprintf(buf, 20, "%s\n", name);
 836}
 837
 838static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 839
 840static ssize_t
 841show_queue_type_field(struct device *dev, struct device_attribute *attr,
 842                      char *buf)
 843{
 844        struct scsi_device *sdev = to_scsi_device(dev);
 845        const char *name = "none";
 846
 847        if (sdev->simple_tags)
 848                name = "simple";
 849
 850        return snprintf(buf, 20, "%s\n", name);
 851}
 852
 853static ssize_t
 854store_queue_type_field(struct device *dev, struct device_attribute *attr,
 855                       const char *buf, size_t count)
 856{
 857        struct scsi_device *sdev = to_scsi_device(dev);
 858
 859        if (!sdev->tagged_supported)
 860                return -EINVAL;
 861                
 862        sdev_printk(KERN_INFO, sdev,
 863                    "ignoring write to deprecated queue_type attribute");
 864        return count;
 865}
 866
 867static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 868                   store_queue_type_field);
 869
 870#define sdev_vpd_pg_attr(_page)                                         \
 871static ssize_t                                                  \
 872show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 873                 struct bin_attribute *bin_attr,                        \
 874                 char *buf, loff_t off, size_t count)                   \
 875{                                                                       \
 876        struct device *dev = kobj_to_dev(kobj);                         \
 877        struct scsi_device *sdev = to_scsi_device(dev);                 \
 878        struct scsi_vpd *vpd_page;                                      \
 879        int ret = -EINVAL;                                              \
 880                                                                        \
 881        rcu_read_lock();                                                \
 882        vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 883        if (vpd_page)                                                   \
 884                ret = memory_read_from_buffer(buf, count, &off,         \
 885                                vpd_page->data, vpd_page->len);         \
 886        rcu_read_unlock();                                              \
 887        return ret;                                                     \
 888}                                                                       \
 889static struct bin_attribute dev_attr_vpd_##_page = {            \
 890        .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 891        .size = 0,                                                      \
 892        .read = show_vpd_##_page,                                       \
 893};
 894
 895sdev_vpd_pg_attr(pg83);
 896sdev_vpd_pg_attr(pg80);
 897sdev_vpd_pg_attr(pg89);
 898sdev_vpd_pg_attr(pg0);
 899
 900static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 901                            struct bin_attribute *bin_attr,
 902                            char *buf, loff_t off, size_t count)
 903{
 904        struct device *dev = kobj_to_dev(kobj);
 905        struct scsi_device *sdev = to_scsi_device(dev);
 906
 907        if (!sdev->inquiry)
 908                return -EINVAL;
 909
 910        return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 911                                       sdev->inquiry_len);
 912}
 913
 914static struct bin_attribute dev_attr_inquiry = {
 915        .attr = {
 916                .name = "inquiry",
 917                .mode = S_IRUGO,
 918        },
 919        .size = 0,
 920        .read = show_inquiry,
 921};
 922
 923static ssize_t
 924show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 925                        char *buf)
 926{
 927        return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 928}
 929
 930static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 931
 932#define show_sdev_iostat(field)                                         \
 933static ssize_t                                                          \
 934show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 935                    char *buf)                                          \
 936{                                                                       \
 937        struct scsi_device *sdev = to_scsi_device(dev);                 \
 938        unsigned long long count = atomic_read(&sdev->field);           \
 939        return snprintf(buf, 20, "0x%llx\n", count);                    \
 940}                                                                       \
 941static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 942
 943show_sdev_iostat(iorequest_cnt);
 944show_sdev_iostat(iodone_cnt);
 945show_sdev_iostat(ioerr_cnt);
 946
 947static ssize_t
 948sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 949{
 950        struct scsi_device *sdev;
 951        sdev = to_scsi_device(dev);
 952        return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 953}
 954static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 955
 956#define DECLARE_EVT_SHOW(name, Cap_name)                                \
 957static ssize_t                                                          \
 958sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 959                     char *buf)                                         \
 960{                                                                       \
 961        struct scsi_device *sdev = to_scsi_device(dev);                 \
 962        int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 963        return snprintf(buf, 20, "%d\n", val);                          \
 964}
 965
 966#define DECLARE_EVT_STORE(name, Cap_name)                               \
 967static ssize_t                                                          \
 968sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 969                      const char *buf, size_t count)                    \
 970{                                                                       \
 971        struct scsi_device *sdev = to_scsi_device(dev);                 \
 972        int val = simple_strtoul(buf, NULL, 0);                         \
 973        if (val == 0)                                                   \
 974                clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 975        else if (val == 1)                                              \
 976                set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 977        else                                                            \
 978                return -EINVAL;                                         \
 979        return count;                                                   \
 980}
 981
 982#define DECLARE_EVT(name, Cap_name)                                     \
 983        DECLARE_EVT_SHOW(name, Cap_name)                                \
 984        DECLARE_EVT_STORE(name, Cap_name)                               \
 985        static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 986                           sdev_store_evt_##name);
 987#define REF_EVT(name) &dev_attr_evt_##name.attr
 988
 989DECLARE_EVT(media_change, MEDIA_CHANGE)
 990DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 991DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 992DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 993DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 994DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 995
 996static ssize_t
 997sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 998                       const char *buf, size_t count)
 999{
1000        int depth, retval;
1001        struct scsi_device *sdev = to_scsi_device(dev);
1002        struct scsi_host_template *sht = sdev->host->hostt;
1003
1004        if (!sht->change_queue_depth)
1005                return -EINVAL;
1006
1007        depth = simple_strtoul(buf, NULL, 0);
1008
1009        if (depth < 1 || depth > sdev->host->can_queue)
1010                return -EINVAL;
1011
1012        retval = sht->change_queue_depth(sdev, depth);
1013        if (retval < 0)
1014                return retval;
1015
1016        sdev->max_queue_depth = sdev->queue_depth;
1017
1018        return count;
1019}
1020sdev_show_function(queue_depth, "%d\n");
1021
1022static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1023                   sdev_store_queue_depth);
1024
1025static ssize_t
1026sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1027                    char *buf)
1028{
1029        struct scsi_device *sdev = to_scsi_device(dev);
1030        ssize_t count;
1031
1032        count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1033        if (count > 0) {
1034                buf[count] = '\n';
1035                count++;
1036        }
1037        return count;
1038}
1039static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1040
1041#define BLIST_FLAG_NAME(name)                                   \
1042        [const_ilog2((__force __u64)BLIST_##name)] = #name
1043static const char *const sdev_bflags_name[] = {
1044#include "scsi_devinfo_tbl.c"
1045};
1046#undef BLIST_FLAG_NAME
1047
1048static ssize_t
1049sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1050                    char *buf)
1051{
1052        struct scsi_device *sdev = to_scsi_device(dev);
1053        int i;
1054        ssize_t len = 0;
1055
1056        for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1057                const char *name = NULL;
1058
1059                if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1060                        continue;
1061                if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1062                        name = sdev_bflags_name[i];
1063
1064                if (name)
1065                        len += scnprintf(buf + len, PAGE_SIZE - len,
1066                                         "%s%s", len ? " " : "", name);
1067                else
1068                        len += scnprintf(buf + len, PAGE_SIZE - len,
1069                                         "%sINVALID_BIT(%d)", len ? " " : "", i);
1070        }
1071        if (len)
1072                len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1073        return len;
1074}
1075static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1076
1077#ifdef CONFIG_SCSI_DH
1078static ssize_t
1079sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1080                   char *buf)
1081{
1082        struct scsi_device *sdev = to_scsi_device(dev);
1083
1084        if (!sdev->handler)
1085                return snprintf(buf, 20, "detached\n");
1086
1087        return snprintf(buf, 20, "%s\n", sdev->handler->name);
1088}
1089
1090static ssize_t
1091sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1092                    const char *buf, size_t count)
1093{
1094        struct scsi_device *sdev = to_scsi_device(dev);
1095        int err = -EINVAL;
1096
1097        if (sdev->sdev_state == SDEV_CANCEL ||
1098            sdev->sdev_state == SDEV_DEL)
1099                return -ENODEV;
1100
1101        if (!sdev->handler) {
1102                /*
1103                 * Attach to a device handler
1104                 */
1105                err = scsi_dh_attach(sdev->request_queue, buf);
1106        } else if (!strncmp(buf, "activate", 8)) {
1107                /*
1108                 * Activate a device handler
1109                 */
1110                if (sdev->handler->activate)
1111                        err = sdev->handler->activate(sdev, NULL, NULL);
1112                else
1113                        err = 0;
1114        } else if (!strncmp(buf, "detach", 6)) {
1115                /*
1116                 * Detach from a device handler
1117                 */
1118                sdev_printk(KERN_WARNING, sdev,
1119                            "can't detach handler %s.\n",
1120                            sdev->handler->name);
1121                err = -EINVAL;
1122        }
1123
1124        return err < 0 ? err : count;
1125}
1126
1127static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1128                   sdev_store_dh_state);
1129
1130static ssize_t
1131sdev_show_access_state(struct device *dev,
1132                       struct device_attribute *attr,
1133                       char *buf)
1134{
1135        struct scsi_device *sdev = to_scsi_device(dev);
1136        unsigned char access_state;
1137        const char *access_state_name;
1138
1139        if (!sdev->handler)
1140                return -EINVAL;
1141
1142        access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1143        access_state_name = scsi_access_state_name(access_state);
1144
1145        return sprintf(buf, "%s\n",
1146                       access_state_name ? access_state_name : "unknown");
1147}
1148static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1149
1150static ssize_t
1151sdev_show_preferred_path(struct device *dev,
1152                         struct device_attribute *attr,
1153                         char *buf)
1154{
1155        struct scsi_device *sdev = to_scsi_device(dev);
1156
1157        if (!sdev->handler)
1158                return -EINVAL;
1159
1160        if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1161                return sprintf(buf, "1\n");
1162        else
1163                return sprintf(buf, "0\n");
1164}
1165static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1166#endif
1167
1168static ssize_t
1169sdev_show_queue_ramp_up_period(struct device *dev,
1170                               struct device_attribute *attr,
1171                               char *buf)
1172{
1173        struct scsi_device *sdev;
1174        sdev = to_scsi_device(dev);
1175        return snprintf(buf, 20, "%u\n",
1176                        jiffies_to_msecs(sdev->queue_ramp_up_period));
1177}
1178
1179static ssize_t
1180sdev_store_queue_ramp_up_period(struct device *dev,
1181                                struct device_attribute *attr,
1182                                const char *buf, size_t count)
1183{
1184        struct scsi_device *sdev = to_scsi_device(dev);
1185        unsigned int period;
1186
1187        if (kstrtouint(buf, 10, &period))
1188                return -EINVAL;
1189
1190        sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1191        return count;
1192}
1193
1194static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1195                   sdev_show_queue_ramp_up_period,
1196                   sdev_store_queue_ramp_up_period);
1197
1198static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1199                                         struct attribute *attr, int i)
1200{
1201        struct device *dev = kobj_to_dev(kobj);
1202        struct scsi_device *sdev = to_scsi_device(dev);
1203
1204
1205        if (attr == &dev_attr_queue_depth.attr &&
1206            !sdev->host->hostt->change_queue_depth)
1207                return S_IRUGO;
1208
1209        if (attr == &dev_attr_queue_ramp_up_period.attr &&
1210            !sdev->host->hostt->change_queue_depth)
1211                return 0;
1212
1213#ifdef CONFIG_SCSI_DH
1214        if (attr == &dev_attr_access_state.attr &&
1215            !sdev->handler)
1216                return 0;
1217        if (attr == &dev_attr_preferred_path.attr &&
1218            !sdev->handler)
1219                return 0;
1220#endif
1221        return attr->mode;
1222}
1223
1224static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1225                                             struct bin_attribute *attr, int i)
1226{
1227        struct device *dev = kobj_to_dev(kobj);
1228        struct scsi_device *sdev = to_scsi_device(dev);
1229
1230
1231        if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1232                return 0;
1233
1234        if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1235                return 0;
1236
1237        if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1238                return 0;
1239
1240        if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1241                return 0;
1242
1243        return S_IRUGO;
1244}
1245
1246/* Default template for device attributes.  May NOT be modified */
1247static struct attribute *scsi_sdev_attrs[] = {
1248        &dev_attr_device_blocked.attr,
1249        &dev_attr_type.attr,
1250        &dev_attr_scsi_level.attr,
1251        &dev_attr_device_busy.attr,
1252        &dev_attr_vendor.attr,
1253        &dev_attr_model.attr,
1254        &dev_attr_rev.attr,
1255        &dev_attr_rescan.attr,
1256        &dev_attr_delete.attr,
1257        &dev_attr_state.attr,
1258        &dev_attr_timeout.attr,
1259        &dev_attr_eh_timeout.attr,
1260        &dev_attr_iocounterbits.attr,
1261        &dev_attr_iorequest_cnt.attr,
1262        &dev_attr_iodone_cnt.attr,
1263        &dev_attr_ioerr_cnt.attr,
1264        &dev_attr_modalias.attr,
1265        &dev_attr_queue_depth.attr,
1266        &dev_attr_queue_type.attr,
1267        &dev_attr_wwid.attr,
1268        &dev_attr_blacklist.attr,
1269#ifdef CONFIG_SCSI_DH
1270        &dev_attr_dh_state.attr,
1271        &dev_attr_access_state.attr,
1272        &dev_attr_preferred_path.attr,
1273#endif
1274        &dev_attr_queue_ramp_up_period.attr,
1275        REF_EVT(media_change),
1276        REF_EVT(inquiry_change_reported),
1277        REF_EVT(capacity_change_reported),
1278        REF_EVT(soft_threshold_reached),
1279        REF_EVT(mode_parameter_change_reported),
1280        REF_EVT(lun_change_reported),
1281        NULL
1282};
1283
1284static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1285        &dev_attr_vpd_pg0,
1286        &dev_attr_vpd_pg83,
1287        &dev_attr_vpd_pg80,
1288        &dev_attr_vpd_pg89,
1289        &dev_attr_inquiry,
1290        NULL
1291};
1292static struct attribute_group scsi_sdev_attr_group = {
1293        .attrs =        scsi_sdev_attrs,
1294        .bin_attrs =    scsi_sdev_bin_attrs,
1295        .is_visible =   scsi_sdev_attr_is_visible,
1296        .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1297};
1298
1299static const struct attribute_group *scsi_sdev_attr_groups[] = {
1300        &scsi_sdev_attr_group,
1301        NULL
1302};
1303
1304static int scsi_target_add(struct scsi_target *starget)
1305{
1306        int error;
1307
1308        if (starget->state != STARGET_CREATED)
1309                return 0;
1310
1311        error = device_add(&starget->dev);
1312        if (error) {
1313                dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1314                return error;
1315        }
1316        transport_add_device(&starget->dev);
1317        starget->state = STARGET_RUNNING;
1318
1319        pm_runtime_set_active(&starget->dev);
1320        pm_runtime_enable(&starget->dev);
1321        device_enable_async_suspend(&starget->dev);
1322
1323        return 0;
1324}
1325
1326/**
1327 * scsi_sysfs_add_sdev - add scsi device to sysfs
1328 * @sdev:       scsi_device to add
1329 *
1330 * Return value:
1331 *      0 on Success / non-zero on Failure
1332 **/
1333int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1334{
1335        int error, i;
1336        struct request_queue *rq = sdev->request_queue;
1337        struct scsi_target *starget = sdev->sdev_target;
1338
1339        error = scsi_target_add(starget);
1340        if (error)
1341                return error;
1342
1343        transport_configure_device(&starget->dev);
1344
1345        device_enable_async_suspend(&sdev->sdev_gendev);
1346        scsi_autopm_get_target(starget);
1347        pm_runtime_set_active(&sdev->sdev_gendev);
1348        if (!sdev->rpm_autosuspend)
1349                pm_runtime_forbid(&sdev->sdev_gendev);
1350        pm_runtime_enable(&sdev->sdev_gendev);
1351        scsi_autopm_put_target(starget);
1352
1353        scsi_autopm_get_device(sdev);
1354
1355        scsi_dh_add_device(sdev);
1356
1357        error = device_add(&sdev->sdev_gendev);
1358        if (error) {
1359                sdev_printk(KERN_INFO, sdev,
1360                                "failed to add device: %d\n", error);
1361                return error;
1362        }
1363
1364        device_enable_async_suspend(&sdev->sdev_dev);
1365        error = device_add(&sdev->sdev_dev);
1366        if (error) {
1367                sdev_printk(KERN_INFO, sdev,
1368                                "failed to add class device: %d\n", error);
1369                device_del(&sdev->sdev_gendev);
1370                return error;
1371        }
1372        transport_add_device(&sdev->sdev_gendev);
1373        sdev->is_visible = 1;
1374
1375        error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1376        if (error)
1377                /* we're treating error on bsg register as non-fatal,
1378                 * so pretend nothing went wrong */
1379                sdev_printk(KERN_INFO, sdev,
1380                            "Failed to register bsg queue, errno=%d\n", error);
1381
1382        /* add additional host specific attributes */
1383        if (sdev->host->hostt->sdev_attrs) {
1384                for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1385                        error = device_create_file(&sdev->sdev_gendev,
1386                                        sdev->host->hostt->sdev_attrs[i]);
1387                        if (error)
1388                                return error;
1389                }
1390        }
1391
1392        if (sdev->host->hostt->sdev_groups) {
1393                error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1394                                sdev->host->hostt->sdev_groups);
1395                if (error)
1396                        return error;
1397        }
1398
1399        scsi_autopm_put_device(sdev);
1400        return error;
1401}
1402
1403void __scsi_remove_device(struct scsi_device *sdev)
1404{
1405        struct device *dev = &sdev->sdev_gendev;
1406        int res;
1407
1408        /*
1409         * This cleanup path is not reentrant and while it is impossible
1410         * to get a new reference with scsi_device_get() someone can still
1411         * hold a previously acquired one.
1412         */
1413        if (sdev->sdev_state == SDEV_DEL)
1414                return;
1415
1416        if (sdev->is_visible) {
1417                /*
1418                 * If scsi_internal_target_block() is running concurrently,
1419                 * wait until it has finished before changing the device state.
1420                 */
1421                mutex_lock(&sdev->state_mutex);
1422                /*
1423                 * If blocked, we go straight to DEL and restart the queue so
1424                 * any commands issued during driver shutdown (like sync
1425                 * cache) are errored immediately.
1426                 */
1427                res = scsi_device_set_state(sdev, SDEV_CANCEL);
1428                if (res != 0) {
1429                        res = scsi_device_set_state(sdev, SDEV_DEL);
1430                        if (res == 0)
1431                                scsi_start_queue(sdev);
1432                }
1433                mutex_unlock(&sdev->state_mutex);
1434
1435                if (res != 0)
1436                        return;
1437
1438                if (sdev->host->hostt->sdev_groups)
1439                        sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1440                                        sdev->host->hostt->sdev_groups);
1441
1442                bsg_unregister_queue(sdev->request_queue);
1443                device_unregister(&sdev->sdev_dev);
1444                transport_remove_device(dev);
1445                device_del(dev);
1446        } else
1447                put_device(&sdev->sdev_dev);
1448
1449        /*
1450         * Stop accepting new requests and wait until all queuecommand() and
1451         * scsi_run_queue() invocations have finished before tearing down the
1452         * device.
1453         */
1454        mutex_lock(&sdev->state_mutex);
1455        scsi_device_set_state(sdev, SDEV_DEL);
1456        mutex_unlock(&sdev->state_mutex);
1457
1458        blk_cleanup_queue(sdev->request_queue);
1459        cancel_work_sync(&sdev->requeue_work);
1460
1461        if (sdev->host->hostt->slave_destroy)
1462                sdev->host->hostt->slave_destroy(sdev);
1463        transport_destroy_device(dev);
1464
1465        /*
1466         * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1467         * removed sysfs visibility from the device, so make the target
1468         * invisible if this was the last device underneath it.
1469         */
1470        scsi_target_reap(scsi_target(sdev));
1471
1472        put_device(dev);
1473}
1474
1475/**
1476 * scsi_remove_device - unregister a device from the scsi bus
1477 * @sdev:       scsi_device to unregister
1478 **/
1479void scsi_remove_device(struct scsi_device *sdev)
1480{
1481        struct Scsi_Host *shost = sdev->host;
1482
1483        mutex_lock(&shost->scan_mutex);
1484        __scsi_remove_device(sdev);
1485        mutex_unlock(&shost->scan_mutex);
1486}
1487EXPORT_SYMBOL(scsi_remove_device);
1488
1489static void __scsi_remove_target(struct scsi_target *starget)
1490{
1491        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1492        unsigned long flags;
1493        struct scsi_device *sdev;
1494
1495        spin_lock_irqsave(shost->host_lock, flags);
1496 restart:
1497        list_for_each_entry(sdev, &shost->__devices, siblings) {
1498                /*
1499                 * We cannot call scsi_device_get() here, as
1500                 * we might've been called from rmmod() causing
1501                 * scsi_device_get() to fail the module_is_live()
1502                 * check.
1503                 */
1504                if (sdev->channel != starget->channel ||
1505                    sdev->id != starget->id)
1506                        continue;
1507                if (sdev->sdev_state == SDEV_DEL ||
1508                    sdev->sdev_state == SDEV_CANCEL ||
1509                    !get_device(&sdev->sdev_gendev))
1510                        continue;
1511                spin_unlock_irqrestore(shost->host_lock, flags);
1512                scsi_remove_device(sdev);
1513                put_device(&sdev->sdev_gendev);
1514                spin_lock_irqsave(shost->host_lock, flags);
1515                goto restart;
1516        }
1517        spin_unlock_irqrestore(shost->host_lock, flags);
1518}
1519
1520/**
1521 * scsi_remove_target - try to remove a target and all its devices
1522 * @dev: generic starget or parent of generic stargets to be removed
1523 *
1524 * Note: This is slightly racy.  It is possible that if the user
1525 * requests the addition of another device then the target won't be
1526 * removed.
1527 */
1528void scsi_remove_target(struct device *dev)
1529{
1530        struct Scsi_Host *shost = dev_to_shost(dev->parent);
1531        struct scsi_target *starget;
1532        unsigned long flags;
1533
1534restart:
1535        spin_lock_irqsave(shost->host_lock, flags);
1536        list_for_each_entry(starget, &shost->__targets, siblings) {
1537                if (starget->state == STARGET_DEL ||
1538                    starget->state == STARGET_REMOVE ||
1539                    starget->state == STARGET_CREATED_REMOVE)
1540                        continue;
1541                if (starget->dev.parent == dev || &starget->dev == dev) {
1542                        kref_get(&starget->reap_ref);
1543                        if (starget->state == STARGET_CREATED)
1544                                starget->state = STARGET_CREATED_REMOVE;
1545                        else
1546                                starget->state = STARGET_REMOVE;
1547                        spin_unlock_irqrestore(shost->host_lock, flags);
1548                        __scsi_remove_target(starget);
1549                        scsi_target_reap(starget);
1550                        goto restart;
1551                }
1552        }
1553        spin_unlock_irqrestore(shost->host_lock, flags);
1554}
1555EXPORT_SYMBOL(scsi_remove_target);
1556
1557int scsi_register_driver(struct device_driver *drv)
1558{
1559        drv->bus = &scsi_bus_type;
1560
1561        return driver_register(drv);
1562}
1563EXPORT_SYMBOL(scsi_register_driver);
1564
1565int scsi_register_interface(struct class_interface *intf)
1566{
1567        intf->class = &sdev_class;
1568
1569        return class_interface_register(intf);
1570}
1571EXPORT_SYMBOL(scsi_register_interface);
1572
1573/**
1574 * scsi_sysfs_add_host - add scsi host to subsystem
1575 * @shost:     scsi host struct to add to subsystem
1576 **/
1577int scsi_sysfs_add_host(struct Scsi_Host *shost)
1578{
1579        int error, i;
1580
1581        /* add host specific attributes */
1582        if (shost->hostt->shost_attrs) {
1583                for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1584                        error = device_create_file(&shost->shost_dev,
1585                                        shost->hostt->shost_attrs[i]);
1586                        if (error)
1587                                return error;
1588                }
1589        }
1590
1591        transport_register_device(&shost->shost_gendev);
1592        transport_configure_device(&shost->shost_gendev);
1593        return 0;
1594}
1595
1596static struct device_type scsi_dev_type = {
1597        .name =         "scsi_device",
1598        .release =      scsi_device_dev_release,
1599        .groups =       scsi_sdev_attr_groups,
1600};
1601
1602void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1603{
1604        unsigned long flags;
1605        struct Scsi_Host *shost = sdev->host;
1606        struct scsi_target  *starget = sdev->sdev_target;
1607
1608        device_initialize(&sdev->sdev_gendev);
1609        sdev->sdev_gendev.bus = &scsi_bus_type;
1610        sdev->sdev_gendev.type = &scsi_dev_type;
1611        dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1612                     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1613
1614        device_initialize(&sdev->sdev_dev);
1615        sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1616        sdev->sdev_dev.class = &sdev_class;
1617        dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1618                     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1619        /*
1620         * Get a default scsi_level from the target (derived from sibling
1621         * devices).  This is the best we can do for guessing how to set
1622         * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1623         * setting doesn't matter, because all the bits are zero anyway.
1624         * But it does matter for higher LUNs.
1625         */
1626        sdev->scsi_level = starget->scsi_level;
1627        if (sdev->scsi_level <= SCSI_2 &&
1628                        sdev->scsi_level != SCSI_UNKNOWN &&
1629                        !shost->no_scsi2_lun_in_cdb)
1630                sdev->lun_in_cdb = 1;
1631
1632        transport_setup_device(&sdev->sdev_gendev);
1633        spin_lock_irqsave(shost->host_lock, flags);
1634        list_add_tail(&sdev->same_target_siblings, &starget->devices);
1635        list_add_tail(&sdev->siblings, &shost->__devices);
1636        spin_unlock_irqrestore(shost->host_lock, flags);
1637        /*
1638         * device can now only be removed via __scsi_remove_device() so hold
1639         * the target.  Target will be held in CREATED state until something
1640         * beneath it becomes visible (in which case it moves to RUNNING)
1641         */
1642        kref_get(&starget->reap_ref);
1643}
1644
1645int scsi_is_sdev_device(const struct device *dev)
1646{
1647        return dev->type == &scsi_dev_type;
1648}
1649EXPORT_SYMBOL(scsi_is_sdev_device);
1650
1651/* A blank transport template that is used in drivers that don't
1652 * yet implement Transport Attributes */
1653struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
1654