kernel-ark/drivers/scsi/scsi_sysfs.c
James Bottomley e73e079bf1 [SCSI] Fix oops caused by queue refcounting failure
In certain circumstances, we can get an oops from a torn down device.
Most notably this is from CD roms trying to call scsi_ioctl.  The root
cause of the problem is the fact that after scsi_remove_device() has
been called, the queue is fully torn down.  This is actually wrong
since the queue can be used until the sdev release function is called.
Therefore, we add an extra reference to the queue which is released in
sdev->release, so the queue always exists.

Reported-by: Parag Warudkar <parag.lkml@gmail.com>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <jbottomley@parallels.com>
2011-06-02 18:34:43 +09:00

1089 lines
28 KiB
C

/*
* 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 <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_driver.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_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;
}
static int check_set(unsigned int *val, char *src)
{
char *last;
if (strncmp(src, "-", 20) == 0) {
*val = SCAN_WILD_CARD;
} else {
/*
* Doesn't check for int overflow
*/
*val = simple_strtoul(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[15], junk;
unsigned int channel, id, lun;
int res;
res = sscanf(str, "%10s %10s %10s %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, 1);
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 */
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);
shost_rd_attr(unique_id, "%u\n");
shost_rd_attr(host_busy, "%hu\n");
shost_rd_attr(cmd_per_lun, "%hd\n");
shost_rd_attr(can_queue, "%hd\n");
shost_rd_attr(sg_tablesize, "%hu\n");
shost_rd_attr(sg_prot_tablesize, "%hu\n");
shost_rd_attr(unchecked_isa_dma, "%d\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 struct attribute *scsi_sysfs_shost_attrs[] = {
&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_unchecked_isa_dma.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,
NULL
};
struct attribute_group scsi_shost_attr_group = {
.attrs = scsi_sysfs_shost_attrs,
};
const struct attribute_group *scsi_sysfs_shost_attr_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 scsi_target *starget;
struct list_head *this, *tmp;
unsigned long flags;
sdev = container_of(work, struct scsi_device, ew.work);
parent = sdev->sdev_gendev.parent;
starget = to_scsi_target(parent);
spin_lock_irqsave(sdev->host->host_lock, flags);
starget->reap_ref++;
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;
scsi_target_reap(scsi_target(sdev));
kfree(sdev->inquiry);
kfree(sdev);
if (parent)
put_device(parent);
}
static void scsi_device_dev_release(struct device *dev)
{
struct scsi_device *sdp = to_scsi_device(dev);
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
};
EXPORT_SYMBOL_GPL(scsi_bus_type);
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 (device_blocked, "%d\n");
sdev_rd_attr (queue_depth, "%d\n");
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");
/*
* 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
store_rescan_field (struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
scsi_rescan_device(dev);
return count;
}
static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
static void sdev_store_delete_callback(struct device *dev)
{
scsi_remove_device(to_scsi_device(dev));
}
static ssize_t
sdev_store_delete(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int rc;
/* An attribute cannot be unregistered by one of its own methods,
* so we have to use this roundabout approach.
*/
rc = device_schedule_callback(dev, sdev_store_delete_callback);
if (rc)
count = rc;
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;
struct scsi_device *sdev = to_scsi_device(dev);
enum scsi_device_state state = 0;
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;
}
}
if (!state)
return -EINVAL;
if (scsi_device_set_state(sdev, state))
return -EINVAL;
return count;
}
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->ordered_tags)
name = "ordered";
else if (sdev->simple_tags)
name = "simple";
return snprintf(buf, 20, "%s\n", name);
}
static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
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);
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)
/* 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_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_iocounterbits.attr,
&dev_attr_iorequest_cnt.attr,
&dev_attr_iodone_cnt.attr,
&dev_attr_ioerr_cnt.attr,
&dev_attr_modalias.attr,
REF_EVT(media_change),
NULL
};
static struct attribute_group scsi_sdev_attr_group = {
.attrs = scsi_sdev_attrs,
};
static const struct attribute_group *scsi_sdev_attr_groups[] = {
&scsi_sdev_attr_group,
NULL
};
static ssize_t
sdev_store_queue_depth_rw(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)
return -EINVAL;
retval = sht->change_queue_depth(sdev, depth,
SCSI_QDEPTH_DEFAULT);
if (retval < 0)
return retval;
sdev->max_queue_depth = sdev->queue_depth;
return count;
}
static struct device_attribute sdev_attr_queue_depth_rw =
__ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
sdev_store_queue_depth_rw);
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 long period;
if (strict_strtoul(buf, 10, &period))
return -EINVAL;
sdev->queue_ramp_up_period = msecs_to_jiffies(period);
return period;
}
static struct device_attribute sdev_attr_queue_ramp_up_period =
__ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
sdev_show_queue_ramp_up_period,
sdev_store_queue_ramp_up_period);
static ssize_t
sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_device *sdev = to_scsi_device(dev);
struct scsi_host_template *sht = sdev->host->hostt;
int tag_type = 0, retval;
int prev_tag_type = scsi_get_tag_type(sdev);
if (!sdev->tagged_supported || !sht->change_queue_type)
return -EINVAL;
if (strncmp(buf, "ordered", 7) == 0)
tag_type = MSG_ORDERED_TAG;
else if (strncmp(buf, "simple", 6) == 0)
tag_type = MSG_SIMPLE_TAG;
else if (strncmp(buf, "none", 4) != 0)
return -EINVAL;
if (tag_type == prev_tag_type)
return count;
retval = sht->change_queue_type(sdev, tag_type);
if (retval < 0)
return retval;
return count;
}
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;
}
static struct device_attribute sdev_attr_queue_type_rw =
__ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
sdev_store_queue_type_rw);
/**
* 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, i;
struct request_queue *rq = sdev->request_queue;
struct scsi_target *starget = sdev->sdev_target;
error = scsi_device_set_state(sdev, SDEV_RUNNING);
if (error)
return error;
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);
pm_runtime_forbid(&sdev->sdev_gendev);
pm_runtime_enable(&sdev->sdev_gendev);
scsi_autopm_put_target(starget);
/* The following call will keep sdev active indefinitely, until
* its driver does a corresponding scsi_autopm_pm_device(). Only
* drivers supporting autosuspend will do this.
*/
scsi_autopm_get_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;
/* create queue files, which may be writable, depending on the host */
if (sdev->host->hostt->change_queue_depth) {
error = device_create_file(&sdev->sdev_gendev,
&sdev_attr_queue_depth_rw);
error = device_create_file(&sdev->sdev_gendev,
&sdev_attr_queue_ramp_up_period);
}
else
error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
if (error)
return error;
if (sdev->host->hostt->change_queue_type)
error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
else
error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
if (error)
return error;
error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
if (error)
/* we're treating error on bsg register as non-fatal,
* so pretend nothing went wrong */
sdev_printk(KERN_INFO, sdev,
"Failed to register bsg queue, errno=%d\n", error);
/* add additional host specific attributes */
if (sdev->host->hostt->sdev_attrs) {
for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
error = device_create_file(&sdev->sdev_gendev,
sdev->host->hostt->sdev_attrs[i]);
if (error)
return error;
}
}
return error;
}
void __scsi_remove_device(struct scsi_device *sdev)
{
struct device *dev = &sdev->sdev_gendev;
if (sdev->is_visible) {
if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
return;
bsg_unregister_queue(sdev->request_queue);
device_unregister(&sdev->sdev_dev);
transport_remove_device(dev);
device_del(dev);
} else
put_device(&sdev->sdev_dev);
scsi_device_set_state(sdev, SDEV_DEL);
if (sdev->host->hostt->slave_destroy)
sdev->host->hostt->slave_destroy(sdev);
transport_destroy_device(dev);
/* cause the request function to reject all I/O requests */
sdev->request_queue->queuedata = NULL;
/* Freeing the queue signals to block that we're done */
scsi_free_queue(sdev->request_queue);
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);
starget->reap_ref++;
restart:
list_for_each_entry(sdev, &shost->__devices, siblings) {
if (sdev->channel != starget->channel ||
sdev->id != starget->id ||
scsi_device_get(sdev))
continue;
spin_unlock_irqrestore(shost->host_lock, flags);
scsi_remove_device(sdev);
scsi_device_put(sdev);
spin_lock_irqsave(shost->host_lock, flags);
goto restart;
}
spin_unlock_irqrestore(shost->host_lock, flags);
scsi_target_reap(starget);
}
static int __remove_child (struct device * dev, void * data)
{
if (scsi_is_target_device(dev))
__scsi_remove_target(to_scsi_target(dev));
return 0;
}
/**
* 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)
{
if (scsi_is_target_device(dev)) {
__scsi_remove_target(to_scsi_target(dev));
return;
}
get_device(dev);
device_for_each_child(dev, NULL, __remove_child);
put_device(dev);
}
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)
{
int error, i;
/* add host specific attributes */
if (shost->hostt->shost_attrs) {
for (i = 0; shost->hostt->shost_attrs[i]; i++) {
error = device_create_file(&shost->shost_dev,
shost->hostt->shost_attrs[i]);
if (error)
return error;
}
}
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_target *starget = sdev->sdev_target;
device_initialize(&sdev->sdev_gendev);
sdev->sdev_gendev.bus = &scsi_bus_type;
sdev->sdev_gendev.type = &scsi_dev_type;
dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
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:%d",
sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
sdev->scsi_level = starget->scsi_level;
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);
}
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, }, }, }, };