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selftests/watchdog: change to print reset reason info.

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The test prints reset reason when WDIOC_GETBOOTSTATUS returns
a 0 flag value and all other cases simply say watchdog.

Parse the flag values returned by WDIOC_GETBOOTSTATUS and print
corresponding reset reason for each WDIOF_* boot status.

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Shuah Khan 2022-10-20 15:18:28 -06:00
parent de3ee3f634
commit 66d1dce0ec
1 changed files with 55 additions and 3 deletions
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58
tools/testing/selftests/watchdog/watchdog-test.c
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@ -1,6 +1,17 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Watchdog Driver Test Program
* Watchdog Driver Test Program
* - Tests all ioctls except WDIOC_GETTEMP
* - Tests Magic Close - CONFIG_WATCHDOG_NOWAYOUT
* - Could be tested against softdog driver on systems that
* don't have watchdog hardware.
* - TODO:
* - WDIOC_GETSTATUS is called when WDIOC_GETBOOTSTATUS is called.
* - Enhance the logic to call WDIOC_GETSTATUS and test return values.
* - Enhance coverage of ioctl return values - flags and status.
* - Enhance test to add coverage for WDIOC_GETTEMP.
*
* Reference: Documentation/watchdog/watchdog-api.rst
*/
#include <errno.h>
@ -91,6 +102,44 @@ static void usage(char *progname)
printf("Example: %s -t 12 -T -n 7 -N\n", progname);
}
struct wdiof_status {
int flag;
const char *status_str;
};
#define WDIOF_NUM_BOOTSTATUS 7
static const struct wdiof_status wdiof_bootstatus[WDIOF_NUM_BOOTSTATUS] = {
{WDIOF_OVERHEAT, "Reset due to CPU overheat"},
{WDIOF_FANFAULT, "Fan failed"},
{WDIOF_EXTERN1, "External relay 1"},
{WDIOF_EXTERN2, "External relay 2"},
{WDIOF_POWERUNDER, "Power bad/power fault"},
{WDIOF_CARDRESET, "Card previously reset the CPU"},
{WDIOF_POWEROVER, "Power over voltage"},
};
static void print_boot_status(int flags)
{
int wdiof = 0;
if (flags == WDIOF_UNKNOWN) {
printf("Unknown flag error from WDIOC_GETBOOTSTATUS\n");
return;
}
if (flags == 0) {
printf("Last boot is caused by: Power-On-Reset\n");
return;
}
for (wdiof = 0; wdiof < WDIOF_NUM_BOOTSTATUS; wdiof++) {
if (flags & wdiof_bootstatus[wdiof].flag)
printf("Last boot is caused by: %s\n",
wdiof_bootstatus[wdiof].status_str);
}
}
int main(int argc, char *argv[])
{
int flags;
@ -140,8 +189,7 @@ int main(int argc, char *argv[])
oneshot = 1;
ret = ioctl(fd, WDIOC_GETBOOTSTATUS, &flags);
if (!ret)
printf("Last boot is caused by: %s.\n", (flags != 0) ?
"Watchdog" : "Power-On-Reset");
print_boot_status(flags);
else
printf("WDIOC_GETBOOTSTATUS error '%s'\n", strerror(errno));
break;
@ -249,6 +297,10 @@ int main(int argc, char *argv[])
sleep(ping_rate);
}
end:
/*
* Send specific magic character 'V' just in case Magic Close is
* enabled to ensure watchdog gets disabled on close.
*/
ret = write(fd, &v, 1);
if (ret < 0)
printf("Stopping watchdog ticks failed (%d)...\n", errno);