diff options
Diffstat (limited to 'drivers/scsi/scsi_sysfs.c')
| -rw-r--r-- | drivers/scsi/scsi_sysfs.c | 1675 |
1 files changed, 1675 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c new file mode 100644 index 000000000..1f531063d --- /dev/null +++ b/drivers/scsi/scsi_sysfs.c @@ -0,0 +1,1675 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * scsi_sysfs.c + * + * SCSI sysfs interface routines. + * + * Created to pull SCSI mid layer sysfs routines into one file. + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/blkdev.h> +#include <linux/device.h> +#include <linux/pm_runtime.h> +#include <linux/bsg.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_dh.h> +#include <scsi/scsi_transport.h> +#include <scsi/scsi_driver.h> +#include <scsi/scsi_devinfo.h> + +#include "scsi_priv.h" +#include "scsi_logging.h" + +static struct device_type scsi_dev_type; + +static const struct { + enum scsi_device_state value; + char *name; +} sdev_states[] = { + { SDEV_CREATED, "created" }, + { SDEV_RUNNING, "running" }, + { SDEV_CANCEL, "cancel" }, + { SDEV_DEL, "deleted" }, + { SDEV_QUIESCE, "quiesce" }, + { SDEV_OFFLINE, "offline" }, + { SDEV_TRANSPORT_OFFLINE, "transport-offline" }, + { SDEV_BLOCK, "blocked" }, + { SDEV_CREATED_BLOCK, "created-blocked" }, +}; + +const char *scsi_device_state_name(enum scsi_device_state state) +{ + int i; + char *name = NULL; + + for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { + if (sdev_states[i].value == state) { + name = sdev_states[i].name; + break; + } + } + return name; +} + +static const struct { + enum scsi_host_state value; + char *name; +} shost_states[] = { + { SHOST_CREATED, "created" }, + { SHOST_RUNNING, "running" }, + { SHOST_CANCEL, "cancel" }, + { SHOST_DEL, "deleted" }, + { SHOST_RECOVERY, "recovery" }, + { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, + { SHOST_DEL_RECOVERY, "deleted/recovery", }, +}; +const char *scsi_host_state_name(enum scsi_host_state state) +{ + int i; + char *name = NULL; + + for (i = 0; i < ARRAY_SIZE(shost_states); i++) { + if (shost_states[i].value == state) { + name = shost_states[i].name; + break; + } + } + return name; +} + +#ifdef CONFIG_SCSI_DH +static const struct { + unsigned char value; + char *name; +} sdev_access_states[] = { + { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" }, + { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" }, + { SCSI_ACCESS_STATE_STANDBY, "standby" }, + { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" }, + { SCSI_ACCESS_STATE_LBA, "lba-dependent" }, + { SCSI_ACCESS_STATE_OFFLINE, "offline" }, + { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" }, +}; + +static const char *scsi_access_state_name(unsigned char state) +{ + int i; + char *name = NULL; + + for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) { + if (sdev_access_states[i].value == state) { + name = sdev_access_states[i].name; + break; + } + } + return name; +} +#endif + +static int check_set(unsigned long long *val, char *src) +{ + char *last; + + if (strcmp(src, "-") == 0) { + *val = SCAN_WILD_CARD; + } else { + /* + * Doesn't check for int overflow + */ + *val = simple_strtoull(src, &last, 0); + if (*last != '\0') + return 1; + } + return 0; +} + +static int scsi_scan(struct Scsi_Host *shost, const char *str) +{ + char s1[15], s2[15], s3[17], junk; + unsigned long long channel, id, lun; + int res; + + res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk); + if (res != 3) + return -EINVAL; + if (check_set(&channel, s1)) + return -EINVAL; + if (check_set(&id, s2)) + return -EINVAL; + if (check_set(&lun, s3)) + return -EINVAL; + if (shost->transportt->user_scan) + res = shost->transportt->user_scan(shost, channel, id, lun); + else + res = scsi_scan_host_selected(shost, channel, id, lun, + SCSI_SCAN_MANUAL); + return res; +} + +/* + * shost_show_function: macro to create an attr function that can be used to + * show a non-bit field. + */ +#define shost_show_function(name, field, format_string) \ +static ssize_t \ +show_##name (struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + struct Scsi_Host *shost = class_to_shost(dev); \ + return snprintf (buf, 20, format_string, shost->field); \ +} + +/* + * shost_rd_attr: macro to create a function and attribute variable for a + * read only field. + */ +#define shost_rd_attr2(name, field, format_string) \ + shost_show_function(name, field, format_string) \ +static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); + +#define shost_rd_attr(field, format_string) \ +shost_rd_attr2(field, field, format_string) + +/* + * Create the actual show/store functions and data structures. + */ + +static ssize_t +store_scan(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct Scsi_Host *shost = class_to_shost(dev); + int res; + + res = scsi_scan(shost, buf); + if (res == 0) + res = count; + return res; +}; +static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); + +static ssize_t +store_shost_state(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int i; + struct Scsi_Host *shost = class_to_shost(dev); + enum scsi_host_state state = 0; + + for (i = 0; i < ARRAY_SIZE(shost_states); i++) { + const int len = strlen(shost_states[i].name); + if (strncmp(shost_states[i].name, buf, len) == 0 && + buf[len] == '\n') { + state = shost_states[i].value; + break; + } + } + if (!state) + return -EINVAL; + + if (scsi_host_set_state(shost, state)) + return -EINVAL; + return count; +} + +static ssize_t +show_shost_state(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + const char *name = scsi_host_state_name(shost->shost_state); + + if (!name) + return -EINVAL; + + return snprintf(buf, 20, "%s\n", name); +} + +/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */ +static struct device_attribute dev_attr_hstate = + __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); + +static ssize_t +show_shost_mode(unsigned int mode, char *buf) +{ + ssize_t len = 0; + + if (mode & MODE_INITIATOR) + len = sprintf(buf, "%s", "Initiator"); + + if (mode & MODE_TARGET) + len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); + + len += sprintf(buf + len, "\n"); + + return len; +} + +static ssize_t +show_shost_supported_mode(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + unsigned int supported_mode = shost->hostt->supported_mode; + + if (supported_mode == MODE_UNKNOWN) + /* by default this should be initiator */ + supported_mode = MODE_INITIATOR; + + return show_shost_mode(supported_mode, buf); +} + +static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); + +static ssize_t +show_shost_active_mode(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + + if (shost->active_mode == MODE_UNKNOWN) + return snprintf(buf, 20, "unknown\n"); + else + return show_shost_mode(shost->active_mode, buf); +} + +static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); + +static int check_reset_type(const char *str) +{ + if (sysfs_streq(str, "adapter")) + return SCSI_ADAPTER_RESET; + else if (sysfs_streq(str, "firmware")) + return SCSI_FIRMWARE_RESET; + else + return 0; +} + +static ssize_t +store_host_reset(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct scsi_host_template *sht = shost->hostt; + int ret = -EINVAL; + int type; + + type = check_reset_type(buf); + if (!type) + goto exit_store_host_reset; + + if (sht->host_reset) + ret = sht->host_reset(shost, type); + else + ret = -EOPNOTSUPP; + +exit_store_host_reset: + if (ret == 0) + ret = count; + return ret; +} + +static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset); + +static ssize_t +show_shost_eh_deadline(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + + if (shost->eh_deadline == -1) + return snprintf(buf, strlen("off") + 2, "off\n"); + return sprintf(buf, "%u\n", shost->eh_deadline / HZ); +} + +static ssize_t +store_shost_eh_deadline(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct Scsi_Host *shost = class_to_shost(dev); + int ret = -EINVAL; + unsigned long deadline, flags; + + if (shost->transportt && + (shost->transportt->eh_strategy_handler || + !shost->hostt->eh_host_reset_handler)) + return ret; + + if (!strncmp(buf, "off", strlen("off"))) + deadline = -1; + else { + ret = kstrtoul(buf, 10, &deadline); + if (ret) + return ret; + if (deadline * HZ > UINT_MAX) + return -EINVAL; + } + + spin_lock_irqsave(shost->host_lock, flags); + if (scsi_host_in_recovery(shost)) + ret = -EBUSY; + else { + if (deadline == -1) + shost->eh_deadline = -1; + else + shost->eh_deadline = deadline * HZ; + + ret = count; + } + spin_unlock_irqrestore(shost->host_lock, flags); + + return ret; +} + +static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline); + +shost_rd_attr(unique_id, "%u\n"); +shost_rd_attr(cmd_per_lun, "%hd\n"); +shost_rd_attr(can_queue, "%d\n"); +shost_rd_attr(sg_tablesize, "%hu\n"); +shost_rd_attr(sg_prot_tablesize, "%hu\n"); +shost_rd_attr(prot_capabilities, "%u\n"); +shost_rd_attr(prot_guard_type, "%hd\n"); +shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); + +static ssize_t +show_host_busy(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + return snprintf(buf, 20, "%d\n", scsi_host_busy(shost)); +} +static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL); + +static ssize_t +show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "1\n"); +} +static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL); + +static ssize_t +show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct blk_mq_tag_set *tag_set = &shost->tag_set; + + return snprintf(buf, 20, "%d\n", tag_set->nr_hw_queues); +} +static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL); + +static struct attribute *scsi_sysfs_shost_attrs[] = { + &dev_attr_use_blk_mq.attr, + &dev_attr_unique_id.attr, + &dev_attr_host_busy.attr, + &dev_attr_cmd_per_lun.attr, + &dev_attr_can_queue.attr, + &dev_attr_sg_tablesize.attr, + &dev_attr_sg_prot_tablesize.attr, + &dev_attr_proc_name.attr, + &dev_attr_scan.attr, + &dev_attr_hstate.attr, + &dev_attr_supported_mode.attr, + &dev_attr_active_mode.attr, + &dev_attr_prot_capabilities.attr, + &dev_attr_prot_guard_type.attr, + &dev_attr_host_reset.attr, + &dev_attr_eh_deadline.attr, + &dev_attr_nr_hw_queues.attr, + NULL +}; + +static const struct attribute_group scsi_shost_attr_group = { + .attrs = scsi_sysfs_shost_attrs, +}; + +const struct attribute_group *scsi_shost_groups[] = { + &scsi_shost_attr_group, + NULL +}; + +static void scsi_device_cls_release(struct device *class_dev) +{ + struct scsi_device *sdev; + + sdev = class_to_sdev(class_dev); + put_device(&sdev->sdev_gendev); +} + +static void scsi_device_dev_release_usercontext(struct work_struct *work) +{ + struct scsi_device *sdev; + struct device *parent; + struct list_head *this, *tmp; + struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL; + struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL; + struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = NULL; + unsigned long flags; + struct module *mod; + + sdev = container_of(work, struct scsi_device, ew.work); + + mod = sdev->host->hostt->module; + + scsi_dh_release_device(sdev); + + parent = sdev->sdev_gendev.parent; + + spin_lock_irqsave(sdev->host->host_lock, flags); + list_del(&sdev->siblings); + list_del(&sdev->same_target_siblings); + list_del(&sdev->starved_entry); + spin_unlock_irqrestore(sdev->host->host_lock, flags); + + cancel_work_sync(&sdev->event_work); + + list_for_each_safe(this, tmp, &sdev->event_list) { + struct scsi_event *evt; + + evt = list_entry(this, struct scsi_event, node); + list_del(&evt->node); + kfree(evt); + } + + blk_put_queue(sdev->request_queue); + /* NULL queue means the device can't be used */ + sdev->request_queue = NULL; + + sbitmap_free(&sdev->budget_map); + + mutex_lock(&sdev->inquiry_mutex); + vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0, + lockdep_is_held(&sdev->inquiry_mutex)); + vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80, + lockdep_is_held(&sdev->inquiry_mutex)); + vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83, + lockdep_is_held(&sdev->inquiry_mutex)); + vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89, + lockdep_is_held(&sdev->inquiry_mutex)); + vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0, + lockdep_is_held(&sdev->inquiry_mutex)); + vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1, + lockdep_is_held(&sdev->inquiry_mutex)); + vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2, + lockdep_is_held(&sdev->inquiry_mutex)); + mutex_unlock(&sdev->inquiry_mutex); + + if (vpd_pg0) + kfree_rcu(vpd_pg0, rcu); + if (vpd_pg83) + kfree_rcu(vpd_pg83, rcu); + if (vpd_pg80) + kfree_rcu(vpd_pg80, rcu); + if (vpd_pg89) + kfree_rcu(vpd_pg89, rcu); + if (vpd_pgb0) + kfree_rcu(vpd_pgb0, rcu); + if (vpd_pgb1) + kfree_rcu(vpd_pgb1, rcu); + if (vpd_pgb2) + kfree_rcu(vpd_pgb2, rcu); + kfree(sdev->inquiry); + kfree(sdev); + + if (parent) + put_device(parent); + module_put(mod); +} + +static void scsi_device_dev_release(struct device *dev) +{ + struct scsi_device *sdp = to_scsi_device(dev); + + /* Set module pointer as NULL in case of module unloading */ + if (!try_module_get(sdp->host->hostt->module)) + sdp->host->hostt->module = NULL; + + execute_in_process_context(scsi_device_dev_release_usercontext, + &sdp->ew); +} + +static struct class sdev_class = { + .name = "scsi_device", + .dev_release = scsi_device_cls_release, +}; + +/* all probing is done in the individual ->probe routines */ +static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) +{ + struct scsi_device *sdp; + + if (dev->type != &scsi_dev_type) + return 0; + + sdp = to_scsi_device(dev); + if (sdp->no_uld_attach) + return 0; + return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; +} + +static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct scsi_device *sdev; + + if (dev->type != &scsi_dev_type) + return 0; + + sdev = to_scsi_device(dev); + + add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); + return 0; +} + +struct bus_type scsi_bus_type = { + .name = "scsi", + .match = scsi_bus_match, + .uevent = scsi_bus_uevent, +#ifdef CONFIG_PM + .pm = &scsi_bus_pm_ops, +#endif +}; + +int scsi_sysfs_register(void) +{ + int error; + + error = bus_register(&scsi_bus_type); + if (!error) { + error = class_register(&sdev_class); + if (error) + bus_unregister(&scsi_bus_type); + } + + return error; +} + +void scsi_sysfs_unregister(void) +{ + class_unregister(&sdev_class); + bus_unregister(&scsi_bus_type); +} + +/* + * sdev_show_function: macro to create an attr function that can be used to + * show a non-bit field. + */ +#define sdev_show_function(field, format_string) \ +static ssize_t \ +sdev_show_##field (struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + struct scsi_device *sdev; \ + sdev = to_scsi_device(dev); \ + return snprintf (buf, 20, format_string, sdev->field); \ +} \ + +/* + * sdev_rd_attr: macro to create a function and attribute variable for a + * read only field. + */ +#define sdev_rd_attr(field, format_string) \ + sdev_show_function(field, format_string) \ +static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); + + +/* + * sdev_rw_attr: create a function and attribute variable for a + * read/write field. + */ +#define sdev_rw_attr(field, format_string) \ + sdev_show_function(field, format_string) \ + \ +static ssize_t \ +sdev_store_##field (struct device *dev, struct device_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + struct scsi_device *sdev; \ + sdev = to_scsi_device(dev); \ + sscanf (buf, format_string, &sdev->field); \ + return count; \ +} \ +static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); + +/* Currently we don't export bit fields, but we might in future, + * so leave this code in */ +#if 0 +/* + * sdev_rd_attr: create a function and attribute variable for a + * read/write bit field. + */ +#define sdev_rw_attr_bit(field) \ + sdev_show_function(field, "%d\n") \ + \ +static ssize_t \ +sdev_store_##field (struct device *dev, struct device_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + int ret; \ + struct scsi_device *sdev; \ + ret = scsi_sdev_check_buf_bit(buf); \ + if (ret >= 0) { \ + sdev = to_scsi_device(dev); \ + sdev->field = ret; \ + ret = count; \ + } \ + return ret; \ +} \ +static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); + +/* + * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", + * else return -EINVAL. + */ +static int scsi_sdev_check_buf_bit(const char *buf) +{ + if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { + if (buf[0] == '1') + return 1; + else if (buf[0] == '0') + return 0; + else + return -EINVAL; + } else + return -EINVAL; +} +#endif +/* + * Create the actual show/store functions and data structures. + */ +sdev_rd_attr (type, "%d\n"); +sdev_rd_attr (scsi_level, "%d\n"); +sdev_rd_attr (vendor, "%.8s\n"); +sdev_rd_attr (model, "%.16s\n"); +sdev_rd_attr (rev, "%.4s\n"); + +static ssize_t +sdev_show_device_busy(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev)); +} +static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL); + +static ssize_t +sdev_show_device_blocked(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked)); +} +static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL); + +/* + * TODO: can we make these symlinks to the block layer ones? + */ +static ssize_t +sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) +{ + struct scsi_device *sdev; + sdev = to_scsi_device(dev); + return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ); +} + +static ssize_t +sdev_store_timeout (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_device *sdev; + int timeout; + sdev = to_scsi_device(dev); + sscanf (buf, "%d\n", &timeout); + blk_queue_rq_timeout(sdev->request_queue, timeout * HZ); + return count; +} +static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); + +static ssize_t +sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct scsi_device *sdev; + sdev = to_scsi_device(dev); + return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ); +} + +static ssize_t +sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_device *sdev; + unsigned int eh_timeout; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + sdev = to_scsi_device(dev); + err = kstrtouint(buf, 10, &eh_timeout); + if (err) + return err; + sdev->eh_timeout = eh_timeout * HZ; + + return count; +} +static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout); + +static ssize_t +store_rescan_field (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + scsi_rescan_device(to_scsi_device(dev)); + return count; +} +static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); + +static ssize_t +sdev_store_delete(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct kernfs_node *kn; + struct scsi_device *sdev = to_scsi_device(dev); + + /* + * We need to try to get module, avoiding the module been removed + * during delete. + */ + if (scsi_device_get(sdev)) + return -ENODEV; + + kn = sysfs_break_active_protection(&dev->kobj, &attr->attr); + WARN_ON_ONCE(!kn); + /* + * Concurrent writes into the "delete" sysfs attribute may trigger + * concurrent calls to device_remove_file() and scsi_remove_device(). + * device_remove_file() handles concurrent removal calls by + * serializing these and by ignoring the second and later removal + * attempts. Concurrent calls of scsi_remove_device() are + * serialized. The second and later calls of scsi_remove_device() are + * ignored because the first call of that function changes the device + * state into SDEV_DEL. + */ + device_remove_file(dev, attr); + scsi_remove_device(sdev); + if (kn) + sysfs_unbreak_active_protection(kn); + scsi_device_put(sdev); + return count; +}; +static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); + +static ssize_t +store_state_field(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int i, ret; + struct scsi_device *sdev = to_scsi_device(dev); + enum scsi_device_state state = 0; + bool rescan_dev = false; + + for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { + const int len = strlen(sdev_states[i].name); + if (strncmp(sdev_states[i].name, buf, len) == 0 && + buf[len] == '\n') { + state = sdev_states[i].value; + break; + } + } + switch (state) { + case SDEV_RUNNING: + case SDEV_OFFLINE: + break; + default: + return -EINVAL; + } + + mutex_lock(&sdev->state_mutex); + switch (sdev->sdev_state) { + case SDEV_RUNNING: + case SDEV_OFFLINE: + break; + default: + mutex_unlock(&sdev->state_mutex); + return -EINVAL; + } + if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) { + ret = 0; + } else { + ret = scsi_device_set_state(sdev, state); + if (ret == 0 && state == SDEV_RUNNING) + rescan_dev = true; + } + mutex_unlock(&sdev->state_mutex); + + if (rescan_dev) { + /* + * If the device state changes to SDEV_RUNNING, we need to + * run the queue to avoid I/O hang, and rescan the device + * to revalidate it. Running the queue first is necessary + * because another thread may be waiting inside + * blk_mq_freeze_queue_wait() and because that call may be + * waiting for pending I/O to finish. + */ + blk_mq_run_hw_queues(sdev->request_queue, true); + scsi_rescan_device(sdev); + } + + return ret == 0 ? count : -EINVAL; +} + +static ssize_t +show_state_field(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + const char *name = scsi_device_state_name(sdev->sdev_state); + + if (!name) + return -EINVAL; + + return snprintf(buf, 20, "%s\n", name); +} + +static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); + +static ssize_t +show_queue_type_field(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + const char *name = "none"; + + if (sdev->simple_tags) + name = "simple"; + + return snprintf(buf, 20, "%s\n", name); +} + +static ssize_t +store_queue_type_field(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_device *sdev = to_scsi_device(dev); + + if (!sdev->tagged_supported) + return -EINVAL; + + sdev_printk(KERN_INFO, sdev, + "ignoring write to deprecated queue_type attribute"); + return count; +} + +static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, + store_queue_type_field); + +#define sdev_vpd_pg_attr(_page) \ +static ssize_t \ +show_vpd_##_page(struct file *filp, struct kobject *kobj, \ + struct bin_attribute *bin_attr, \ + char *buf, loff_t off, size_t count) \ +{ \ + struct device *dev = kobj_to_dev(kobj); \ + struct scsi_device *sdev = to_scsi_device(dev); \ + struct scsi_vpd *vpd_page; \ + int ret = -EINVAL; \ + \ + rcu_read_lock(); \ + vpd_page = rcu_dereference(sdev->vpd_##_page); \ + if (vpd_page) \ + ret = memory_read_from_buffer(buf, count, &off, \ + vpd_page->data, vpd_page->len); \ + rcu_read_unlock(); \ + return ret; \ +} \ +static struct bin_attribute dev_attr_vpd_##_page = { \ + .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \ + .size = 0, \ + .read = show_vpd_##_page, \ +}; + +sdev_vpd_pg_attr(pg83); +sdev_vpd_pg_attr(pg80); +sdev_vpd_pg_attr(pg89); +sdev_vpd_pg_attr(pgb0); +sdev_vpd_pg_attr(pgb1); +sdev_vpd_pg_attr(pgb2); +sdev_vpd_pg_attr(pg0); + +static ssize_t show_inquiry(struct file *filep, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + struct device *dev = kobj_to_dev(kobj); + struct scsi_device *sdev = to_scsi_device(dev); + + if (!sdev->inquiry) + return -EINVAL; + + return memory_read_from_buffer(buf, count, &off, sdev->inquiry, + sdev->inquiry_len); +} + +static struct bin_attribute dev_attr_inquiry = { + .attr = { + .name = "inquiry", + .mode = S_IRUGO, + }, + .size = 0, + .read = show_inquiry, +}; + +static ssize_t +show_iostat_counterbits(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); +} + +static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); + +#define show_sdev_iostat(field) \ +static ssize_t \ +show_iostat_##field(struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + struct scsi_device *sdev = to_scsi_device(dev); \ + unsigned long long count = atomic_read(&sdev->field); \ + return snprintf(buf, 20, "0x%llx\n", count); \ +} \ +static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) + +show_sdev_iostat(iorequest_cnt); +show_sdev_iostat(iodone_cnt); +show_sdev_iostat(ioerr_cnt); +show_sdev_iostat(iotmo_cnt); + +static ssize_t +sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct scsi_device *sdev; + sdev = to_scsi_device(dev); + return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); +} +static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); + +#define DECLARE_EVT_SHOW(name, Cap_name) \ +static ssize_t \ +sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + struct scsi_device *sdev = to_scsi_device(dev); \ + int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ + return snprintf(buf, 20, "%d\n", val); \ +} + +#define DECLARE_EVT_STORE(name, Cap_name) \ +static ssize_t \ +sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ + const char *buf, size_t count) \ +{ \ + struct scsi_device *sdev = to_scsi_device(dev); \ + int val = simple_strtoul(buf, NULL, 0); \ + if (val == 0) \ + clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ + else if (val == 1) \ + set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ + else \ + return -EINVAL; \ + return count; \ +} + +#define DECLARE_EVT(name, Cap_name) \ + DECLARE_EVT_SHOW(name, Cap_name) \ + DECLARE_EVT_STORE(name, Cap_name) \ + static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ + sdev_store_evt_##name); +#define REF_EVT(name) &dev_attr_evt_##name.attr + +DECLARE_EVT(media_change, MEDIA_CHANGE) +DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED) +DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED) +DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED) +DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED) +DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED) + +static ssize_t +sdev_store_queue_depth(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int depth, retval; + struct scsi_device *sdev = to_scsi_device(dev); + struct scsi_host_template *sht = sdev->host->hostt; + + if (!sht->change_queue_depth) + return -EINVAL; + + depth = simple_strtoul(buf, NULL, 0); + + if (depth < 1 || depth > sdev->host->can_queue) + return -EINVAL; + + retval = sht->change_queue_depth(sdev, depth); + if (retval < 0) + return retval; + + sdev->max_queue_depth = sdev->queue_depth; + + return count; +} +sdev_show_function(queue_depth, "%d\n"); + +static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, + sdev_store_queue_depth); + +static ssize_t +sdev_show_wwid(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + ssize_t count; + + count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE); + if (count > 0) { + buf[count] = '\n'; + count++; + } + return count; +} +static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL); + +#define BLIST_FLAG_NAME(name) \ + [const_ilog2((__force __u64)BLIST_##name)] = #name +static const char *const sdev_bflags_name[] = { +#include "scsi_devinfo_tbl.c" +}; +#undef BLIST_FLAG_NAME + +static ssize_t +sdev_show_blacklist(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + int i; + ssize_t len = 0; + + for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) { + const char *name = NULL; + + if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i))) + continue; + if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i]) + name = sdev_bflags_name[i]; + + if (name) + len += scnprintf(buf + len, PAGE_SIZE - len, + "%s%s", len ? " " : "", name); + else + len += scnprintf(buf + len, PAGE_SIZE - len, + "%sINVALID_BIT(%d)", len ? " " : "", i); + } + if (len) + len += scnprintf(buf + len, PAGE_SIZE - len, "\n"); + return len; +} +static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL); + +#ifdef CONFIG_SCSI_DH +static ssize_t +sdev_show_dh_state(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + + if (!sdev->handler) + return snprintf(buf, 20, "detached\n"); + + return snprintf(buf, 20, "%s\n", sdev->handler->name); +} + +static ssize_t +sdev_store_dh_state(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_device *sdev = to_scsi_device(dev); + int err = -EINVAL; + + if (sdev->sdev_state == SDEV_CANCEL || + sdev->sdev_state == SDEV_DEL) + return -ENODEV; + + if (!sdev->handler) { + /* + * Attach to a device handler + */ + err = scsi_dh_attach(sdev->request_queue, buf); + } else if (!strncmp(buf, "activate", 8)) { + /* + * Activate a device handler + */ + if (sdev->handler->activate) + err = sdev->handler->activate(sdev, NULL, NULL); + else + err = 0; + } else if (!strncmp(buf, "detach", 6)) { + /* + * Detach from a device handler + */ + sdev_printk(KERN_WARNING, sdev, + "can't detach handler %s.\n", + sdev->handler->name); + err = -EINVAL; + } + + return err < 0 ? err : count; +} + +static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state, + sdev_store_dh_state); + +static ssize_t +sdev_show_access_state(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + unsigned char access_state; + const char *access_state_name; + + if (!sdev->handler) + return -EINVAL; + + access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK); + access_state_name = scsi_access_state_name(access_state); + + return sprintf(buf, "%s\n", + access_state_name ? access_state_name : "unknown"); +} +static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL); + +static ssize_t +sdev_show_preferred_path(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + + if (!sdev->handler) + return -EINVAL; + + if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED) + return sprintf(buf, "1\n"); + else + return sprintf(buf, "0\n"); +} +static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL); +#endif + +static ssize_t +sdev_show_queue_ramp_up_period(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev; + sdev = to_scsi_device(dev); + return snprintf(buf, 20, "%u\n", + jiffies_to_msecs(sdev->queue_ramp_up_period)); +} + +static ssize_t +sdev_store_queue_ramp_up_period(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_device *sdev = to_scsi_device(dev); + unsigned int period; + + if (kstrtouint(buf, 10, &period)) + return -EINVAL; + + sdev->queue_ramp_up_period = msecs_to_jiffies(period); + return count; +} + +static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR, + sdev_show_queue_ramp_up_period, + sdev_store_queue_ramp_up_period); + +static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int i) +{ + struct device *dev = kobj_to_dev(kobj); + struct scsi_device *sdev = to_scsi_device(dev); + + + if (attr == &dev_attr_queue_depth.attr && + !sdev->host->hostt->change_queue_depth) + return S_IRUGO; + + if (attr == &dev_attr_queue_ramp_up_period.attr && + !sdev->host->hostt->change_queue_depth) + return 0; + + return attr->mode; +} + +static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj, + struct bin_attribute *attr, int i) +{ + struct device *dev = kobj_to_dev(kobj); + struct scsi_device *sdev = to_scsi_device(dev); + + + if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0) + return 0; + + if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80) + return 0; + + if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83) + return 0; + + if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89) + return 0; + + if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0) + return 0; + + if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1) + return 0; + + if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2) + return 0; + + return S_IRUGO; +} + +/* Default template for device attributes. May NOT be modified */ +static struct attribute *scsi_sdev_attrs[] = { + &dev_attr_device_blocked.attr, + &dev_attr_type.attr, + &dev_attr_scsi_level.attr, + &dev_attr_device_busy.attr, + &dev_attr_vendor.attr, + &dev_attr_model.attr, + &dev_attr_rev.attr, + &dev_attr_rescan.attr, + &dev_attr_delete.attr, + &dev_attr_state.attr, + &dev_attr_timeout.attr, + &dev_attr_eh_timeout.attr, + &dev_attr_iocounterbits.attr, + &dev_attr_iorequest_cnt.attr, + &dev_attr_iodone_cnt.attr, + &dev_attr_ioerr_cnt.attr, + &dev_attr_iotmo_cnt.attr, + &dev_attr_modalias.attr, + &dev_attr_queue_depth.attr, + &dev_attr_queue_type.attr, + &dev_attr_wwid.attr, + &dev_attr_blacklist.attr, +#ifdef CONFIG_SCSI_DH + &dev_attr_dh_state.attr, + &dev_attr_access_state.attr, + &dev_attr_preferred_path.attr, +#endif + &dev_attr_queue_ramp_up_period.attr, + REF_EVT(media_change), + REF_EVT(inquiry_change_reported), + REF_EVT(capacity_change_reported), + REF_EVT(soft_threshold_reached), + REF_EVT(mode_parameter_change_reported), + REF_EVT(lun_change_reported), + NULL +}; + +static struct bin_attribute *scsi_sdev_bin_attrs[] = { + &dev_attr_vpd_pg0, + &dev_attr_vpd_pg83, + &dev_attr_vpd_pg80, + &dev_attr_vpd_pg89, + &dev_attr_vpd_pgb0, + &dev_attr_vpd_pgb1, + &dev_attr_vpd_pgb2, + &dev_attr_inquiry, + NULL +}; +static struct attribute_group scsi_sdev_attr_group = { + .attrs = scsi_sdev_attrs, + .bin_attrs = scsi_sdev_bin_attrs, + .is_visible = scsi_sdev_attr_is_visible, + .is_bin_visible = scsi_sdev_bin_attr_is_visible, +}; + +static const struct attribute_group *scsi_sdev_attr_groups[] = { + &scsi_sdev_attr_group, + NULL +}; + +static int scsi_target_add(struct scsi_target *starget) +{ + int error; + + if (starget->state != STARGET_CREATED) + return 0; + + error = device_add(&starget->dev); + if (error) { + dev_err(&starget->dev, "target device_add failed, error %d\n", error); + return error; + } + transport_add_device(&starget->dev); + starget->state = STARGET_RUNNING; + + pm_runtime_set_active(&starget->dev); + pm_runtime_enable(&starget->dev); + device_enable_async_suspend(&starget->dev); + + return 0; +} + +/** + * scsi_sysfs_add_sdev - add scsi device to sysfs + * @sdev: scsi_device to add + * + * Return value: + * 0 on Success / non-zero on Failure + **/ +int scsi_sysfs_add_sdev(struct scsi_device *sdev) +{ + int error; + struct scsi_target *starget = sdev->sdev_target; + + error = scsi_target_add(starget); + if (error) + return error; + + transport_configure_device(&starget->dev); + + device_enable_async_suspend(&sdev->sdev_gendev); + scsi_autopm_get_target(starget); + pm_runtime_set_active(&sdev->sdev_gendev); + if (!sdev->rpm_autosuspend) + pm_runtime_forbid(&sdev->sdev_gendev); + pm_runtime_enable(&sdev->sdev_gendev); + scsi_autopm_put_target(starget); + + scsi_autopm_get_device(sdev); + + scsi_dh_add_device(sdev); + + error = device_add(&sdev->sdev_gendev); + if (error) { + sdev_printk(KERN_INFO, sdev, + "failed to add device: %d\n", error); + return error; + } + + device_enable_async_suspend(&sdev->sdev_dev); + error = device_add(&sdev->sdev_dev); + if (error) { + sdev_printk(KERN_INFO, sdev, + "failed to add class device: %d\n", error); + device_del(&sdev->sdev_gendev); + return error; + } + transport_add_device(&sdev->sdev_gendev); + sdev->is_visible = 1; + + if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) { + sdev->bsg_dev = scsi_bsg_register_queue(sdev); + if (IS_ERR(sdev->bsg_dev)) { + error = PTR_ERR(sdev->bsg_dev); + sdev_printk(KERN_INFO, sdev, + "Failed to register bsg queue, errno=%d\n", + error); + sdev->bsg_dev = NULL; + } + } + + scsi_autopm_put_device(sdev); + return error; +} + +void __scsi_remove_device(struct scsi_device *sdev) +{ + struct device *dev = &sdev->sdev_gendev; + int res; + + /* + * This cleanup path is not reentrant and while it is impossible + * to get a new reference with scsi_device_get() someone can still + * hold a previously acquired one. + */ + if (sdev->sdev_state == SDEV_DEL) + return; + + if (sdev->is_visible) { + /* + * If scsi_internal_target_block() is running concurrently, + * wait until it has finished before changing the device state. + */ + mutex_lock(&sdev->state_mutex); + /* + * If blocked, we go straight to DEL and restart the queue so + * any commands issued during driver shutdown (like sync + * cache) are errored immediately. + */ + res = scsi_device_set_state(sdev, SDEV_CANCEL); + if (res != 0) { + res = scsi_device_set_state(sdev, SDEV_DEL); + if (res == 0) + scsi_start_queue(sdev); + } + mutex_unlock(&sdev->state_mutex); + + if (res != 0) + return; + + if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev) + bsg_unregister_queue(sdev->bsg_dev); + device_unregister(&sdev->sdev_dev); + transport_remove_device(dev); + device_del(dev); + } else + put_device(&sdev->sdev_dev); + + /* + * Stop accepting new requests and wait until all queuecommand() and + * scsi_run_queue() invocations have finished before tearing down the + * device. + */ + mutex_lock(&sdev->state_mutex); + scsi_device_set_state(sdev, SDEV_DEL); + mutex_unlock(&sdev->state_mutex); + + blk_mq_destroy_queue(sdev->request_queue); + kref_put(&sdev->host->tagset_refcnt, scsi_mq_free_tags); + cancel_work_sync(&sdev->requeue_work); + + if (sdev->host->hostt->slave_destroy) + sdev->host->hostt->slave_destroy(sdev); + transport_destroy_device(dev); + + /* + * Paired with the kref_get() in scsi_sysfs_initialize(). We have + * removed sysfs visibility from the device, so make the target + * invisible if this was the last device underneath it. + */ + scsi_target_reap(scsi_target(sdev)); + + put_device(dev); +} + +/** + * scsi_remove_device - unregister a device from the scsi bus + * @sdev: scsi_device to unregister + **/ +void scsi_remove_device(struct scsi_device *sdev) +{ + struct Scsi_Host *shost = sdev->host; + + mutex_lock(&shost->scan_mutex); + __scsi_remove_device(sdev); + mutex_unlock(&shost->scan_mutex); +} +EXPORT_SYMBOL(scsi_remove_device); + +static void __scsi_remove_target(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + unsigned long flags; + struct scsi_device *sdev; + + spin_lock_irqsave(shost->host_lock, flags); + restart: + list_for_each_entry(sdev, &shost->__devices, siblings) { + /* + * We cannot call scsi_device_get() here, as + * we might've been called from rmmod() causing + * scsi_device_get() to fail the module_is_live() + * check. + */ + if (sdev->channel != starget->channel || + sdev->id != starget->id) + continue; + if (sdev->sdev_state == SDEV_DEL || + sdev->sdev_state == SDEV_CANCEL || + !get_device(&sdev->sdev_gendev)) + continue; + spin_unlock_irqrestore(shost->host_lock, flags); + scsi_remove_device(sdev); + put_device(&sdev->sdev_gendev); + spin_lock_irqsave(shost->host_lock, flags); + goto restart; + } + spin_unlock_irqrestore(shost->host_lock, flags); +} + +/** + * scsi_remove_target - try to remove a target and all its devices + * @dev: generic starget or parent of generic stargets to be removed + * + * Note: This is slightly racy. It is possible that if the user + * requests the addition of another device then the target won't be + * removed. + */ +void scsi_remove_target(struct device *dev) +{ + struct Scsi_Host *shost = dev_to_shost(dev->parent); + struct scsi_target *starget; + unsigned long flags; + +restart: + spin_lock_irqsave(shost->host_lock, flags); + list_for_each_entry(starget, &shost->__targets, siblings) { + if (starget->state == STARGET_DEL || + starget->state == STARGET_REMOVE || + starget->state == STARGET_CREATED_REMOVE) + continue; + if (starget->dev.parent == dev || &starget->dev == dev) { + kref_get(&starget->reap_ref); + if (starget->state == STARGET_CREATED) + starget->state = STARGET_CREATED_REMOVE; + else + starget->state = STARGET_REMOVE; + spin_unlock_irqrestore(shost->host_lock, flags); + __scsi_remove_target(starget); + scsi_target_reap(starget); + goto restart; + } + } + spin_unlock_irqrestore(shost->host_lock, flags); +} +EXPORT_SYMBOL(scsi_remove_target); + +int scsi_register_driver(struct device_driver *drv) +{ + drv->bus = &scsi_bus_type; + + return driver_register(drv); +} +EXPORT_SYMBOL(scsi_register_driver); + +int scsi_register_interface(struct class_interface *intf) +{ + intf->class = &sdev_class; + + return class_interface_register(intf); +} +EXPORT_SYMBOL(scsi_register_interface); + +/** + * scsi_sysfs_add_host - add scsi host to subsystem + * @shost: scsi host struct to add to subsystem + **/ +int scsi_sysfs_add_host(struct Scsi_Host *shost) +{ + transport_register_device(&shost->shost_gendev); + transport_configure_device(&shost->shost_gendev); + return 0; +} + +static struct device_type scsi_dev_type = { + .name = "scsi_device", + .release = scsi_device_dev_release, + .groups = scsi_sdev_attr_groups, +}; + +void scsi_sysfs_device_initialize(struct scsi_device *sdev) +{ + unsigned long flags; + struct Scsi_Host *shost = sdev->host; + struct scsi_host_template *hostt = shost->hostt; + struct scsi_target *starget = sdev->sdev_target; + + device_initialize(&sdev->sdev_gendev); + sdev->sdev_gendev.bus = &scsi_bus_type; + sdev->sdev_gendev.type = &scsi_dev_type; + scsi_enable_async_suspend(&sdev->sdev_gendev); + dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu", + sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); + sdev->sdev_gendev.groups = hostt->sdev_groups; + + device_initialize(&sdev->sdev_dev); + sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev); + sdev->sdev_dev.class = &sdev_class; + dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu", + sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); + /* + * Get a default scsi_level from the target (derived from sibling + * devices). This is the best we can do for guessing how to set + * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the + * setting doesn't matter, because all the bits are zero anyway. + * But it does matter for higher LUNs. + */ + sdev->scsi_level = starget->scsi_level; + if (sdev->scsi_level <= SCSI_2 && + sdev->scsi_level != SCSI_UNKNOWN && + !shost->no_scsi2_lun_in_cdb) + sdev->lun_in_cdb = 1; + + transport_setup_device(&sdev->sdev_gendev); + spin_lock_irqsave(shost->host_lock, flags); + list_add_tail(&sdev->same_target_siblings, &starget->devices); + list_add_tail(&sdev->siblings, &shost->__devices); + spin_unlock_irqrestore(shost->host_lock, flags); + /* + * device can now only be removed via __scsi_remove_device() so hold + * the target. Target will be held in CREATED state until something + * beneath it becomes visible (in which case it moves to RUNNING) + */ + kref_get(&starget->reap_ref); +} + +int scsi_is_sdev_device(const struct device *dev) +{ + return dev->type == &scsi_dev_type; +} +EXPORT_SYMBOL(scsi_is_sdev_device); + +/* A blank transport template that is used in drivers that don't + * yet implement Transport Attributes */ +struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; |