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scsi: scsi_debug: Add debugfs interface to fail target reset

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The interface is found at
/sys/kernel/debug/scsi_debug/target<h:c:t>/fail_reset where <h:c:t>
identifies the target to inject errors on. It's a simple bool type
interface which would make this target's reset fail if set to 'Y'.

Signed-off-by: Wenchao Hao <haowenchao2@huawei.com>
Link: https://lore.kernel.org/r/20231010092051.608007-10-haowenchao2@huawei.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Wenchao Hao 2023-10-10 17:20:50 +08:00 committed by Martin K. Petersen
parent 0267811625
commit f084fe52c6
1 changed files with 113 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

114
drivers/scsi/scsi_debug.c
View file

@ -42,6 +42,7 @@
#include <linux/xarray.h>
#include <linux/prefetch.h>
#include <linux/debugfs.h>
#include <linux/async.h>
#include <net/checksum.h>
@ -357,6 +358,11 @@ struct sdebug_dev_info {
struct list_head inject_err_list;
};
struct sdebug_target_info {
bool reset_fail;
struct dentry *debugfs_entry;
};
struct sdebug_host_info {
struct list_head host_list;
int si_idx; /* sdeb_store_info (per host) xarray index */
@ -1082,6 +1088,91 @@ static const struct file_operations sdebug_error_fops = {
.release = single_release,
};
static int sdebug_target_reset_fail_show(struct seq_file *m, void *p)
{
struct scsi_target *starget = (struct scsi_target *)m->private;
struct sdebug_target_info *targetip =
(struct sdebug_target_info *)starget->hostdata;
if (targetip)
seq_printf(m, "%c\n", targetip->reset_fail ? 'Y' : 'N');
return 0;
}
static int sdebug_target_reset_fail_open(struct inode *inode, struct file *file)
{
return single_open(file, sdebug_target_reset_fail_show, inode->i_private);
}
static ssize_t sdebug_target_reset_fail_write(struct file *file,
const char __user *ubuf, size_t count, loff_t *ppos)
{
int ret;
struct scsi_target *starget =
(struct scsi_target *)file->f_inode->i_private;
struct sdebug_target_info *targetip =
(struct sdebug_target_info *)starget->hostdata;
if (targetip) {
ret = kstrtobool_from_user(ubuf, count, &targetip->reset_fail);
return ret < 0 ? ret : count;
}
return -ENODEV;
}
static const struct file_operations sdebug_target_reset_fail_fops = {
.open = sdebug_target_reset_fail_open,
.read = seq_read,
.write = sdebug_target_reset_fail_write,
.release = single_release,
};
static int sdebug_target_alloc(struct scsi_target *starget)
{
struct sdebug_target_info *targetip;
struct dentry *dentry;
targetip = kzalloc(sizeof(struct sdebug_target_info), GFP_KERNEL);
if (!targetip)
return -ENOMEM;
targetip->debugfs_entry = debugfs_create_dir(dev_name(&starget->dev),
sdebug_debugfs_root);
if (IS_ERR_OR_NULL(targetip->debugfs_entry))
pr_info("%s: failed to create debugfs directory for target %s\n",
__func__, dev_name(&starget->dev));
debugfs_create_file("fail_reset", 0600, targetip->debugfs_entry, starget,
&sdebug_target_reset_fail_fops);
if (IS_ERR_OR_NULL(dentry))
pr_info("%s: failed to create fail_reset file for target %s\n",
__func__, dev_name(&starget->dev));
starget->hostdata = targetip;
return 0;
}
static void sdebug_tartget_cleanup_async(void *data, async_cookie_t cookie)
{
struct sdebug_target_info *targetip = data;
debugfs_remove(targetip->debugfs_entry);
kfree(targetip);
}
static void sdebug_target_destroy(struct scsi_target *starget)
{
struct sdebug_target_info *targetip;
targetip = (struct sdebug_target_info *)starget->hostdata;
if (targetip) {
starget->hostdata = NULL;
async_schedule(sdebug_tartget_cleanup_async, targetip);
}
}
/* Only do the extra work involved in logical block provisioning if one or
* more of the lbpu, lbpws or lbpws10 parameters are given and we are doing
* real reads and writes (i.e. not skipping them for speed).
@ -5642,11 +5733,25 @@ static int scsi_debug_device_reset(struct scsi_cmnd *SCpnt)
return SUCCESS;
}
static int sdebug_fail_target_reset(struct scsi_cmnd *cmnd)
{
struct scsi_target *starget = scsi_target(cmnd->device);
struct sdebug_target_info *targetip =
(struct sdebug_target_info *)starget->hostdata;
if (targetip)
return targetip->reset_fail;
return 0;
}
static int scsi_debug_target_reset(struct scsi_cmnd *SCpnt)
{
struct scsi_device *sdp = SCpnt->device;
struct sdebug_host_info *sdbg_host = shost_to_sdebug_host(sdp->host);
struct sdebug_dev_info *devip;
u8 *cmd = SCpnt->cmnd;
u8 opcode = cmd[0];
int k = 0;
++num_target_resets;
@ -5664,6 +5769,12 @@ static int scsi_debug_target_reset(struct scsi_cmnd *SCpnt)
sdev_printk(KERN_INFO, sdp,
"%s: %d device(s) found in target\n", __func__, k);
if (sdebug_fail_target_reset(SCpnt)) {
scmd_printk(KERN_INFO, SCpnt, "fail target reset 0x%x\n",
opcode);
return FAILED;
}
return SUCCESS;
}
@ -8119,7 +8230,6 @@ static int sdebug_init_cmd_priv(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
return 0;
}
static struct scsi_host_template sdebug_driver_template = {
.show_info = scsi_debug_show_info,
.write_info = scsi_debug_write_info,
@ -8149,6 +8259,8 @@ static struct scsi_host_template sdebug_driver_template = {
.track_queue_depth = 1,
.cmd_size = sizeof(struct sdebug_scsi_cmd),
.init_cmd_priv = sdebug_init_cmd_priv,
.target_alloc = sdebug_target_alloc,
.target_destroy = sdebug_target_destroy,
};
static int sdebug_driver_probe(struct device *dev)