Commit 7340faae authored by Bart Van Assche's avatar Bart Van Assche Committed by Martin K. Petersen
Browse files

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

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: default avatarAvri Altman <Avri.Altman@wdc.com>
Signed-off-by: default avatarBart Van Assche <bvanassche@acm.org>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent e0022c6c

drivers/scsi/ufs/ufs-debugfs.c

+65 −0
Original line number Diff line number Diff line
@@ -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 },

	{ }

};