ipmi watchdog : add panic_wdt_timeout parameter

  modprobe ipmi_watchdog timeout=<t> pretimeout=<t> action=<action type>

      preaction=<preaction type> preop=<preop type> start_now=x

      nowayout=x ifnum_to_use=n

      nowayout=x ifnum_to_use=n panic_wdt_timeout=<t>

ifnum_to_use specifies which interface the watchdog timer should use.

The default is -1, which means to pick the first one registered.

occur (if pretimeout is zero, then pretimeout will not be enabled).  Note

that the pretimeout is the time before the final timeout.  So if the

timeout is 50 seconds and the pretimeout is 10 seconds, then the pretimeout

will occur in 40 second (10 seconds before the timeout).

will occur in 40 second (10 seconds before the timeout). The panic_wdt_timeout

is the value of timeout which is set on kernel panic, in order to let actions

such as kdump to occur during panic.

The action may be "reset", "power_cycle", or "power_off", and

specifies what to do when the timer times out, and defaults to

	ipmi_watchdog.preop=<preop type>

	ipmi_watchdog.start_now=x

	ipmi_watchdog.nowayout=x

	ipmi_watchdog.panic_wdt_timeout=<t>

The options are the same as the module parameter options.

/* The pre-timeout is disabled by default. */

static int pretimeout;

/* Default timeout to set on panic */

static int panic_wdt_timeout = 255;

/* Default action is to reset the board on a timeout. */

static unsigned char action_val = WDOG_TIMEOUT_RESET;

module_param(pretimeout, timeout, 0644);

MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds.");

module_param(panic_wdt_timeout, timeout, 0644);

MODULE_PARM_DESC(timeout, "Timeout value on kernel panic in seconds.");

module_param_cb(action, &param_ops_str, action_op, 0644);

MODULE_PARM_DESC(action, "Timeout action. One of: "

		 "reset, none, power_cycle, power_off.");

		/* Make sure we do this only once. */

		panic_event_handled = 1;

		timeout = 255;

		timeout = panic_wdt_timeout;

		pretimeout = 0;

		panic_halt_ipmi_set_timeout();

	}