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authorTomas Winkler <tomas.winkler@intel.com>2016-01-08 00:49:23 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-06 22:11:06 -0800
commitc9cf20ee45602a7a5512b7fbbef5672382790555 (patch)
tree4b3555c09e163186c194a3a5cf5c7daffe94b905 /drivers/watchdog
parent222818c3d84c1f3190767f5f09f2b9b9a0e0ca7f (diff)
downloadlinux-c9cf20ee45602a7a5512b7fbbef5672382790555.tar.bz2
watchdog: mei_wdt: add status debugfs entry
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>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/mei_wdt.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/watchdog/mei_wdt.c b/drivers/watchdog/mei_wdt.c
index 32e3e1d55ef3..e7e3f144f2b0 100644
--- a/drivers/watchdog/mei_wdt.c
+++ b/drivers/watchdog/mei_wdt.c
@@ -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;