LCOV - code coverage report
Current view: top level - drivers/scsi - scsi_sysfs.c (source / functions) Hit Total Coverage
Test: landlock.info Lines: 10 562 1.8 %
Date: 2021-04-22 12:43:58 Functions: 2 91 2.2 %

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

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