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UPSTREAM: scsi: ufs: core: Add debugfs attributes for triggering the UFS EH

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Make it easier to test the impact of the UFS error handler on software that
submits SCSI commands to the UFS driver.

Link: https://lore.kernel.org/r/20211020214024.2007615-8-bvanassche@acm.org
Acked-by: Avri Altman <Avri.Altman@wdc.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Bug: 234653003
(cherry picked from commit 7340faae94)
Change-Id: I792191e2e00591974cc4ab83bd5f6e23267094c2
Signed-off-by: Bart Van Assche <bvanassche@google.com>
This commit is contained in:
Bart Van Assche
2021-10-20 14:40:21 -07:00
committed by Bart Van Assche
parent 305287f66a
commit 0c9724bdb8
1 changed files with 65 additions and 0 deletions
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65
drivers/scsi/ufs/ufs-debugfs.c
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@@ -138,8 +138,73 @@ static void ufs_debugfs_restart_ee(struct work_struct *work)
ufs_debugfs_put_user_access(hba);
}
static int ufs_saved_err_show(struct seq_file *s, void *data)
{
struct ufs_debugfs_attr *attr = s->private;
struct ufs_hba *hba = hba_from_file(s->file);
const int *p;
if (strcmp(attr->name, "saved_err") == 0) {
p = &hba->saved_err;
} else if (strcmp(attr->name, "saved_uic_err") == 0) {
p = &hba->saved_uic_err;
} else {
return -ENOENT;
}
seq_printf(s, "%d\n", *p);
return 0;
}
static ssize_t ufs_saved_err_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct ufs_debugfs_attr *attr = file->f_inode->i_private;
struct ufs_hba *hba = hba_from_file(file);
char val_str[16] = { };
int val, ret;
if (count > sizeof(val_str))
return -EINVAL;
if (copy_from_user(val_str, buf, count))
return -EFAULT;
ret = kstrtoint(val_str, 0, &val);
if (ret < 0)
return ret;
spin_lock_irq(hba->host->host_lock);
if (strcmp(attr->name, "saved_err") == 0) {
hba->saved_err = val;
} else if (strcmp(attr->name, "saved_uic_err") == 0) {
hba->saved_uic_err = val;
} else {
ret = -ENOENT;
}
if (ret == 0)
ufshcd_schedule_eh_work(hba);
spin_unlock_irq(hba->host->host_lock);
return ret < 0 ? ret : count;
}
static int ufs_saved_err_open(struct inode *inode, struct file *file)
{
return single_open(file, ufs_saved_err_show, inode->i_private);
}
static const struct file_operations ufs_saved_err_fops = {
.owner = THIS_MODULE,
.open = ufs_saved_err_open,
.read = seq_read,
.write = ufs_saved_err_write,
.llseek = seq_lseek,
.release = single_release,
};
static const struct ufs_debugfs_attr ufs_attrs[] = {
{ "stats", 0400, &ufs_debugfs_stats_fops },
{ "saved_err", 0600, &ufs_saved_err_fops },
{ "saved_uic_err", 0600, &ufs_saved_err_fops },
{ }
};