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scsi: hisi_sas: Limit users changing debugfs BIST count value 

Add a file operation for "cnt" file under bist directory, so users can only
read "cnt" or clear "cnt" to zero, but cannot randomly modify.

Link: https://lore.kernel.org/r/1645703489-87194-6-git-send-email-john.garry@huawei.com
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Qi Liu <liuqi115@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Xiang Chen 2022-02-24 19:51:28 +08:00 committed by Martin K. Petersen
parent 86287065fa
commit 286ce4c65f
1 changed files with 50 additions and 2 deletions
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52
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
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@ -3975,6 +3975,54 @@ static const struct file_operations debugfs_bist_phy_v3_hw_fops = {
.owner = THIS_MODULE,
};
static ssize_t debugfs_bist_cnt_v3_hw_write(struct file *filp,
const char __user *buf,
size_t count, loff_t *ppos)
{
struct seq_file *m = filp->private_data;
struct hisi_hba *hisi_hba = m->private;
unsigned int cnt;
int val;
if (hisi_hba->debugfs_bist_enable)
return -EPERM;
val = kstrtouint_from_user(buf, count, 0, &cnt);
if (val)
return val;
if (cnt)
return -EINVAL;
hisi_hba->debugfs_bist_cnt = 0;
return count;
}
static int debugfs_bist_cnt_v3_hw_show(struct seq_file *s, void *p)
{
struct hisi_hba *hisi_hba = s->private;
seq_printf(s, "%u\n", hisi_hba->debugfs_bist_cnt);
return 0;
}
static int debugfs_bist_cnt_v3_hw_open(struct inode *inode,
struct file *filp)
{
return single_open(filp, debugfs_bist_cnt_v3_hw_show,
inode->i_private);
}
static const struct file_operations debugfs_bist_cnt_v3_hw_ops = {
.open = debugfs_bist_cnt_v3_hw_open,
.read = seq_read,
.write = debugfs_bist_cnt_v3_hw_write,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static const struct {
int value;
char *name;
@ -4612,8 +4660,8 @@ static void debugfs_bist_init_v3_hw(struct hisi_hba *hisi_hba)
debugfs_create_file("phy_id", 0600, hisi_hba->debugfs_bist_dentry,
hisi_hba, &debugfs_bist_phy_v3_hw_fops);
debugfs_create_u32("cnt", 0600, hisi_hba->debugfs_bist_dentry,
&hisi_hba->debugfs_bist_cnt);
debugfs_create_file("cnt", 0600, hisi_hba->debugfs_bist_dentry,
hisi_hba, &debugfs_bist_cnt_v3_hw_ops);
debugfs_create_file("loopback_mode", 0600,
hisi_hba->debugfs_bist_dentry,