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Commit 8d2b3ffc authored by Yaniv Gardi's avatar Yaniv Gardi
Browse files

scsi: ufs-debugfs: modify "err_inj_scenario" debugfs entry 



err_inj_scenario debugfs entry used to be a u32 entity.
This change modifies it to be a file entity, so reading it
(cat /d/.../err_inj_scenario) helps the user get useful information
about the enabled/disabled error scenarios.

Change-Id: Ia805e6f5357009752ddcace3ae4ed87061e48759
Signed-off-by: default avatarYaniv Gardi <ygardi@codeaurora.org>
parent b258a45b

drivers/scsi/ufs/ufs-debugfs.c

+68 −3
Original line number Diff line number Diff line
@@ -315,6 +315,71 @@ out: 
	return;

}



static int ufsdbg_err_inj_scenario_read(struct seq_file *file, void *data)

{

	struct ufs_hba *hba = (struct ufs_hba *)file->private;

	enum ufsdbg_err_inject_scenario err_case;



	if (!hba)

		return -EINVAL;



	seq_printf(file, "%-40s %-17s %-15s\n",

		   "Error Scenario:", "Bit[#]", "STATUS");



	for (err_case = ERR_INJECT_INTR;

		err_case < ERR_INJECT_MAX_ERR_SCENARIOS; err_case++) {

		seq_printf(file, "%-40s 0x%-15lx %-15s\n",

			   err_scen_arr[err_case].name,

			   UFS_BIT(err_case),

			   hba->debugfs_files.err_inj_scenario_mask &

				UFS_BIT(err_case) ? "ENABLE" : "DISABLE");

	}



	seq_printf(file, "bitwise of error scenario is 0x%x\n\n",

		   hba->debugfs_files.err_inj_scenario_mask);



	seq_puts(file, "usage example:\n");

	seq_puts(file, "echo 0x4 > /sys/kernel/debug/.../err_inj_scenario\n");

	seq_puts(file, "in order to enable ERR_INJECT_INTR\n");



	return 0;

}



static

int ufsdbg_err_inj_scenario_open(struct inode *inode, struct file *file)

{

	return single_open(file,

			ufsdbg_err_inj_scenario_read, inode->i_private);

}



static ssize_t ufsdbg_err_inj_scenario_write(struct file *file,

				     const char __user *ubuf, size_t cnt,

				     loff_t *ppos)

{

	struct ufs_hba *hba = file->f_mapping->host->i_private;

	int ret;

	int err_scen = 0;



	if (!hba)

		return -EINVAL;



	ret = kstrtoint_from_user(ubuf, cnt, 0, &err_scen);

	if (ret) {

		dev_err(hba->dev, "%s: Invalid argument\n", __func__);

		return ret;

	}



	hba->debugfs_files.err_inj_scenario_mask |= err_scen;



	return cnt;

}



static const struct file_operations ufsdbg_err_inj_scenario_ops = {

	.open		= ufsdbg_err_inj_scenario_open,

	.read		= seq_read,

	.write		= ufsdbg_err_inj_scenario_write,

};



static int ufsdbg_err_inj_stats_read(struct seq_file *file, void *data)

{

	enum ufsdbg_err_inject_scenario err;
@@ -379,10 +444,10 @@ static void ufsdbg_setup_fault_injection(struct ufs_hba *hba) 
	}



	hba->debugfs_files.err_inj_scenario =

		debugfs_create_u32("err_inj_scenario",

		debugfs_create_file("err_inj_scenario",

				   S_IRUGO | S_IWUGO,

				   hba->debugfs_files.debugfs_root,

				   &hba->debugfs_files.err_inj_scenario_mask);

				   hba->debugfs_files.debugfs_root, hba,

				   &ufsdbg_err_inj_scenario_ops);



	if (!hba->debugfs_files.err_inj_scenario) {

		dev_err(hba->dev,