linux/tools/testing/selftests/watchdog/watchdog-test.c
Eugeniu Rosca a3d6d79f11 selftests: watchdog: get boot reason via WDIOC_GETBOOTSTATUS
Some watchdog drivers implement WDIOF_CARDRESET feature. As example,
see commit b6ef36d2c1 ("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 if watchdog drivers properly implement WDIOF_CARDRESET.
- check the last boot status, if WDIOF_CARDRESET is implemented.

Make the `-b, --bootstatus` option one-shot. That means, skip the
keepalive mechanism if `-b` is provided on the command line, as we
are only interested in the boot status information.

Tested on Rcar-H3 Salvator-X board:

********************** Cold boot finished
salvator-x:/home/root# ./watchdog-test -h
Usage: ./watchdog-test [options]
 -b, --bootstatus    Get last boot status (Watchdog/POR)
 -d, --disable       Turn off the watchdog timer
 -e, --enable        Turn on the watchdog timer
 -h, --help          Print the help message
 -p, --pingrate=P    Set ping rate to P seconds (default 1)
 -t, --timeout=T     Set timeout to T seconds

Parameters are parsed left-to-right in real-time.
Example: ./watchdog-test -d -t 10 -p 5 -e
salvator-x:/home/root#
salvator-x:/home/root# ./watchdog-test -b
Last boot is caused by: Power-On-Reset.
salvator-x:/home/root#
salvator-x:/home/root# ./watchdog-test -d -t 1 -p 2 -e
Watchdog card disabled.
Watchdog timeout set to 1 seconds.
Watchdog ping rate set to 2 seconds.
Watchdog card enabled.
Watchdog Ticking Away!
********************** Reboot due to watchdog trigger finished
salvator-x:/home/root# ./watchdog-test -b
Last boot is caused by: Watchdog.
salvator-x:/home/root#
salvator-x:/home/root# reboot
********************** Reboot due to user action finished
salvator-x:/home/root# ./watchdog-test -b
Last boot is caused by: Power-On-Reset.
salvator-x:/home/root#

Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
2017-07-24 12:37:07 -06:00

161 lines
3.7 KiB
C

/*
* Watchdog Driver Test Program
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#define DEFAULT_PING_RATE 1
int fd;
const char v = 'V';
static const char sopts[] = "bdehp:t:";
static const struct option lopts[] = {
{"bootstatus", no_argument, NULL, 'b'},
{"disable", no_argument, NULL, 'd'},
{"enable", no_argument, NULL, 'e'},
{"help", no_argument, NULL, 'h'},
{"pingrate", required_argument, NULL, 'p'},
{"timeout", required_argument, NULL, 't'},
{NULL, no_argument, NULL, 0x0}
};
/*
* This function simply sends an IOCTL to the driver, which in turn ticks
* the PC Watchdog card to reset its internal timer so it doesn't trigger
* a computer reset.
*/
static void keep_alive(void)
{
int dummy;
int ret;
ret = ioctl(fd, WDIOC_KEEPALIVE, &dummy);
if (!ret)
printf(".");
}
/*
* The main program. Run the program with "-d" to disable the card,
* or "-e" to enable the card.
*/
static void term(int sig)
{
int ret = write(fd, &v, 1);
close(fd);
if (ret < 0)
printf("\nStopping watchdog ticks failed (%d)...\n", errno);
else
printf("\nStopping watchdog ticks...\n");
exit(0);
}
static void usage(char *progname)
{
printf("Usage: %s [options]\n", progname);
printf(" -b, --bootstatus Get last boot status (Watchdog/POR)\n");
printf(" -d, --disable Turn off the watchdog timer\n");
printf(" -e, --enable Turn on the watchdog timer\n");
printf(" -h, --help Print the help message\n");
printf(" -p, --pingrate=P Set ping rate to P seconds (default %d)\n", DEFAULT_PING_RATE);
printf(" -t, --timeout=T Set timeout to T seconds\n");
printf("\n");
printf("Parameters are parsed left-to-right in real-time.\n");
printf("Example: %s -d -t 10 -p 5 -e\n", progname);
}
int main(int argc, char *argv[])
{
int flags;
unsigned int ping_rate = DEFAULT_PING_RATE;
int ret;
int c;
int oneshot = 0;
setbuf(stdout, NULL);
fd = open("/dev/watchdog", O_WRONLY);
if (fd == -1) {
printf("Watchdog device not enabled.\n");
exit(-1);
}
while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
switch (c) {
case 'b':
flags = 0;
oneshot = 1;
ret = ioctl(fd, WDIOC_GETBOOTSTATUS, &flags);
if (!ret)
printf("Last boot is caused by: %s.\n", (flags != 0) ?
"Watchdog" : "Power-On-Reset");
else
printf("WDIOC_GETBOOTSTATUS errno '%s'\n", strerror(errno));
break;
case 'd':
flags = WDIOS_DISABLECARD;
ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
if (!ret)
printf("Watchdog card disabled.\n");
else
printf("WDIOS_DISABLECARD errno '%s'\n", strerror(errno));
break;
case 'e':
flags = WDIOS_ENABLECARD;
ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
if (!ret)
printf("Watchdog card enabled.\n");
else
printf("WDIOS_ENABLECARD errno '%s'\n", strerror(errno));
break;
case 'p':
ping_rate = strtoul(optarg, NULL, 0);
if (!ping_rate)
ping_rate = DEFAULT_PING_RATE;
printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
break;
case 't':
flags = strtoul(optarg, NULL, 0);
ret = ioctl(fd, WDIOC_SETTIMEOUT, &flags);
if (!ret)
printf("Watchdog timeout set to %u seconds.\n", flags);
else
printf("WDIOC_SETTIMEOUT errno '%s'\n", strerror(errno));
break;
default:
usage(argv[0]);
goto end;
}
}
if (oneshot)
goto end;
printf("Watchdog Ticking Away!\n");
signal(SIGINT, term);
while (1) {
keep_alive();
sleep(ping_rate);
}
end:
ret = write(fd, &v, 1);
if (ret < 0)
printf("Stopping watchdog ticks failed (%d)...\n", errno);
close(fd);
return 0;
}