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19 12月, 2017

WATCHDOG 啟用 & test sample code

kernel 如果有開啟 WATCHDOG
  則 /dev 會有 watchdog node

  # 下 lsmod 會看見 ie6xx_wdt

 
  # kenel config 要加上
  CONFIG_IE6XX_WDT=m
  # Intel Atom E6xx Watchdog driver.

test sample code:

testwdt.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "watchdog.h"

int main(int argc, char **argv)
{
	int fd, timeout=5, cleartime=10;

	fd = open("/dev/watchdog",O_RDWR);
	if (fd) {
		if(argc > 2){
			timeout = atoi(argv[1]);
			cleartime = atoi(argv[2]);
		}else {
			printf("Usage: %s [WDT TIMEOUT] [CLEAR TIME]\n", argv[0]);
			close(fd);
			return 0;
		}
		ioctl(fd, WDIOC_SETTIMEOUT, &timeout);
		ioctl(fd, WDIOC_GETTIMEOUT, &timeout);
		printf("Timeout: %d\n", timeout);
		printf("Clear Time: %d\n", cleartime);
		while (1) {
			ioctl(fd, WDIOC_KEEPALIVE, 0);
			sleep(cleartime);
		}
		close(fd);
	}else
		printf("open failed...\n");
 
	return 0;
}

watchdog.h

#include <linux/ioctl.h>
#include <linux/types.h>

/*
 *	Generic watchdog defines. Derived from..
 *
 * Berkshire PC Watchdog Defines
 * by Ken Hollis 
 *
 */

#ifndef _LINUX_WATCHDOG_H
#define _LINUX_WATCHDOG_H


#define	WATCHDOG_IOCTL_BASE	'W'

struct watchdog_info {
	__u32 options;		/* Options the card/driver supports */
	__u32 firmware_version;	/* Firmware version of the card */
	__u8  identity[32];	/* Identity of the board */
};

#define	WDIOC_GETSUPPORT	_IOR(WATCHDOG_IOCTL_BASE, 0, struct watchdog_info)
#define	WDIOC_GETSTATUS		_IOR(WATCHDOG_IOCTL_BASE, 1, int)
#define	WDIOC_GETBOOTSTATUS	_IOR(WATCHDOG_IOCTL_BASE, 2, int)
#define	WDIOC_GETTEMP		_IOR(WATCHDOG_IOCTL_BASE, 3, int)
#define	WDIOC_SETOPTIONS	_IOR(WATCHDOG_IOCTL_BASE, 4, int)
#define	WDIOC_KEEPALIVE		_IOR(WATCHDOG_IOCTL_BASE, 5, int)
#define	WDIOC_SETTIMEOUT        _IOWR(WATCHDOG_IOCTL_BASE, 6, int)
#define	WDIOC_GETTIMEOUT        _IOR(WATCHDOG_IOCTL_BASE, 7, int)
#define	WDIOC_SETPRETIMEOUT	_IOWR(WATCHDOG_IOCTL_BASE, 8, int)
#define	WDIOC_GETPRETIMEOUT	_IOR(WATCHDOG_IOCTL_BASE, 9, int)
#define	WDIOC_GETTIMELEFT	_IOR(WATCHDOG_IOCTL_BASE, 10, int)

#define	WDIOF_UNKNOWN		-1	/* Unknown flag error */
#define	WDIOS_UNKNOWN		-1	/* Unknown status error */

#define	WDIOF_OVERHEAT		0x0001	/* Reset due to CPU overheat */
#define	WDIOF_FANFAULT		0x0002	/* Fan failed */
#define	WDIOF_EXTERN1		0x0004	/* External relay 1 */
#define	WDIOF_EXTERN2		0x0008	/* External relay 2 */
#define	WDIOF_POWERUNDER	0x0010	/* Power bad/power fault */
#define	WDIOF_CARDRESET		0x0020	/* Card previously reset the CPU */
#define	WDIOF_POWEROVER		0x0040	/* Power over voltage */
#define	WDIOF_SETTIMEOUT	0x0080  /* Set timeout (in seconds) */
#define	WDIOF_MAGICCLOSE	0x0100	/* Supports magic close char */
#define	WDIOF_PRETIMEOUT	0x0200  /* Pretimeout (in seconds), get/set */
#define	WDIOF_KEEPALIVEPING	0x8000	/* Keep alive ping reply */

#define	WDIOS_DISABLECARD	0x0001	/* Turn off the watchdog timer */
#define	WDIOS_ENABLECARD	0x0002	/* Turn on the watchdog timer */
#define	WDIOS_TEMPPANIC		0x0004	/* Kernel panic on temperature trip */


#endif  /* ifndef _LINUX_WATCHDOG_H */

./watchdog_daemon 5 10
Timeout: 5
Clear Time: 10

5 秒後還沒 clean 就直接重開機了

重開的時候是不會看過關機訊息

因為是直接觸發 soc restart 的腳位

0 意見:

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