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watchdog: mei_wdt: add status debugfs entry

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Add entry for displaying current watchdog internal state

cat <debugfs>/mei_wdt/state
IDLE|START|RUNNING|STOPPING

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2016-01-08 00:49:23 +02:00 committed by Greg Kroah-Hartman
parent 222818c3d8
commit c9cf20ee45
1 changed files with 87 additions and 0 deletions
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87
drivers/watchdog/mei_wdt.c
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@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/debugfs.h>
#include <linux/watchdog.h>
#include <linux/uuid.h>
@ -54,6 +55,24 @@ enum mei_wdt_state {
MEI_WDT_STOPPING,
};
#if IS_ENABLED(CONFIG_DEBUG_FS)
static const char *mei_wdt_state_str(enum mei_wdt_state state)
{
switch (state) {
case MEI_WDT_IDLE:
return "IDLE";
case MEI_WDT_START:
return "START";
case MEI_WDT_RUNNING:
return "RUNNING";
case MEI_WDT_STOPPING:
return "STOPPING";
default:
return "unknown";
}
}
#endif /* CONFIG_DEBUG_FS */
/**
* struct mei_wdt - mei watchdog driver
* @wdd: watchdog device
@ -61,6 +80,8 @@ enum mei_wdt_state {
* @cldev: mei watchdog client device
* @state: watchdog internal state
* @timeout: watchdog current timeout
*
* @dbgfs_dir: debugfs dir entry
*/
struct mei_wdt {
struct watchdog_device wdd;
@ -68,6 +89,10 @@ struct mei_wdt {
struct mei_cl_device *cldev;
enum mei_wdt_state state;
u16 timeout;
#if IS_ENABLED(CONFIG_DEBUG_FS)
struct dentry *dbgfs_dir;
#endif /* CONFIG_DEBUG_FS */
};
/*
@ -310,6 +335,63 @@ static int mei_wdt_register(struct mei_wdt *wdt)
return ret;
}
#if IS_ENABLED(CONFIG_DEBUG_FS)
static ssize_t mei_dbgfs_read_state(struct file *file, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct mei_wdt *wdt = file->private_data;
const size_t bufsz = 32;
char buf[bufsz];
ssize_t pos;
pos = scnprintf(buf, bufsz, "state: %s\n",
mei_wdt_state_str(wdt->state));
return simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
}
static const struct file_operations dbgfs_fops_state = {
.open = simple_open,
.read = mei_dbgfs_read_state,
.llseek = generic_file_llseek,
};
static void dbgfs_unregister(struct mei_wdt *wdt)
{
debugfs_remove_recursive(wdt->dbgfs_dir);
wdt->dbgfs_dir = NULL;
}
static int dbgfs_register(struct mei_wdt *wdt)
{
struct dentry *dir, *f;
dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
if (!dir)
return -ENOMEM;
wdt->dbgfs_dir = dir;
f = debugfs_create_file("state", S_IRUSR, dir, wdt, &dbgfs_fops_state);
if (!f)
goto err;
return 0;
err:
dbgfs_unregister(wdt);
return -ENODEV;
}
#else
static inline void dbgfs_unregister(struct mei_wdt *wdt) {}
static inline int dbgfs_register(struct mei_wdt *wdt)
{
return 0;
}
#endif /* CONFIG_DEBUG_FS */
static int mei_wdt_probe(struct mei_cl_device *cldev,
const struct mei_cl_device_id *id)
{
@ -337,6 +419,9 @@ static int mei_wdt_probe(struct mei_cl_device *cldev,
if (ret)
goto err_disable;
if (dbgfs_register(wdt))
dev_warn(&cldev->dev, "cannot register debugfs\n");
return 0;
err_disable:
@ -356,6 +441,8 @@ static int mei_wdt_remove(struct mei_cl_device *cldev)
mei_cldev_disable(cldev);
dbgfs_unregister(wdt);
kfree(wdt);
return 0;