[PATCH v2 2/2] selftests: watchdog: get boot reason via WDIOC_GETBOOTSTATUS

[Eugeniu Rosca <erosca@xxxxxxxxxxxxxx>]

Some watchdog drivers implement WDIOF_CARDRESET feature. As example,
see commit b6ef36d2c1e3 ("watchdog: qcom: Report reboot reason").
This option allows reporting to userspace the cause of the last boot
(POR/watchdog reset), being helpful in e.g. automated test-cases.

Add support for WDIOC_GETBOOTSTATUS in the test code, to be able to
check whether watchdog drivers properly implement WDIOF_CARDRESET.

Tested on Rcar-H3 Salvator-X board:
********************** Cold boot finished
salvator-x:/home/root#
salvator-x:/home/root# ./wdt_test -s -t 1 -p 10 -e
Last boot is caused by: Power-On-Reset.
Watchdog timeout set to 1 seconds.
Watchdog ping rate set to 10 seconds.
Watchdog card enabled.
Watchdog Ticking Away!
********************** Reboot due to watchdog trigger finished
salvator-x:/home/root#
salvator-x:/home/root# ./wdt_test -s
Last boot is caused by: Watchdog.
Watchdog Ticking Away!
.....^C
Stopping watchdog ticks...
salvator-x:/home/root# reboot
********************** Reboot due to user action finished
salvator-x:/home/root#
salvator-x:/home/root# ./wdt_test -s
Last boot is caused by: Power-On-Reset.
Watchdog Ticking Away!
...^C
Stopping watchdog ticks...
salvator-x:/home/root# ./wdt_test --help
-s to print the status (POR/watchdog) of the last boot,
-d to disable, -e to enable, -t <n> to set the timeout,
-p <n> to set the ping rate, and run by itself to tick the card.
Parameters are parsed left-to-right in real-time.
Example: ./wdt_test -d -t 10 -p 5 -e
salvator-x:/home/root#

Signed-off-by: Eugeniu Rosca <erosca@xxxxxxxxxxxxxx>
---
 tools/testing/selftests/watchdog/watchdog-test.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c
index 11d3e8cfb20c..28826eda69af 100644
--- a/tools/testing/selftests/watchdog/watchdog-test.c
+++ b/tools/testing/selftests/watchdog/watchdog-test.c
@@ -54,6 +54,7 @@ int main(int argc, char *argv[])
     unsigned int ping_rate = 1;
     int ret;
     int i;
+    int bootstatus;
 
     setbuf(stdout, NULL);
 
@@ -85,7 +86,15 @@ int main(int argc, char *argv[])
             ping_rate = strtoul(argv[i + 1], NULL, 0);
             printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
             i++;
+        } else if (!strncasecmp(argv[i], "-s", 2)) {
+            ret = ioctl(fd, WDIOC_GETBOOTSTATUS, &bootstatus);
+            if (!ret)
+                printf("Last boot is caused by: %s.\n", (bootstatus != 0) ?
+                       "Watchdog" : "Power-On-Reset");
+            else
+                printf("Error: WDIOC_GETBOOTSTATUS failed.\n");
         } else {
+            printf("-s to print the status (POR/watchdog) of the last boot,\n");
             printf("-d to disable, -e to enable, -t <n> to set "
                 "the timeout,\n-p <n> to set the ping rate, and ");
             printf("run by itself to tick the card.\n");
-- 
2.13.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html