1 // SPDX-License-Identifier: GPL-2.0+
44  * that can reasonably support the IPMI NMI watchdog timeout at this
81 /* Operations that can be performed on a pretimout. */
87 /* Actions to perform on a full timeout. */
98  * pre-timeout in seconds.
110  * 6 (the timeout time) of the set command, and bytes 6 and 7 (the
111  * timeout time) and 8 and 9 (the current countdown value) of the
112  * response.  The timeout value is given in seconds (in the command it
132 /* Default the timeout to 10 seconds. */
133 static int timeout = 10;  variable
135 /* The pre-timeout is disabled by default. */
138 /* Default timeout to set on panic */
141 /* Default action is to reset the board on a timeout. */
144 static char action[16] = "reset";
160 static int ifnum_to_use = -1;
184 		return -EINVAL;  in set_param_timeout()
187 		return -EINVAL;  in set_param_timeout()
189 	*((int *)kp->arg) = l;  in set_param_timeout()
211 	action_fn  fn = (action_fn) kp->arg;  in set_param_str()
234 	action_fn fn = (action_fn) kp->arg;  in get_param_str()
276 		 "timer.  Setting to -1 defaults to the first registered "
279 module_param(timeout, timeout, 0644);
280 MODULE_PARM_DESC(timeout, "Timeout value in seconds.");
282 module_param(pretimeout, timeout, 0644);
285 module_param(panic_wdt_timeout, timeout, 0644);
286 MODULE_PARM_DESC(panic_wdt_timeout, "Timeout value on kernel panic in seconds.");
289 MODULE_PARM_DESC(action, "Timeout action. One of: "
290 		 "reset, none, power_cycle, power_off.");
315  * If set to 1, the heartbeat command will set the state to reset and
327 static atomic_t preop_panic_excl = ATOMIC_INIT(-1);
377 			/* This is an IPMI 1.5-only feature. */  in __ipmi_set_timeout()
398 	WDOG_SET_TIMEOUT(data[4], data[5], timeout);  in __ipmi_set_timeout()
417 		pr_warn("set timeout error: %d\n", rv);  in __ipmi_set_timeout()
430 		return -ENODEV;  in _ipmi_set_timeout()
486 	 * Don't reset the timer if we have the timer turned off, that  in panic_halt_ipmi_heartbeat()
487 	 * re-enables the watchdog.  in panic_halt_ipmi_heartbeat()
520  * at panic or halt time, in run-to-completion mode, when the caller
538 		pr_warn("Unable to extend the watchdog timeout\n");  in panic_halt_ipmi_set_timeout()
556 	 * Don't reset the timer if we have the timer turned off, that  in __ipmi_heartbeat()
557 	 * re-enables the watchdog.  in __ipmi_heartbeat()
593 			rv = -EIO;  in __ipmi_heartbeat()
599 		 * probably reset and lost the watchdog information.  Attempt  in __ipmi_heartbeat()
603 		 * deadlock on this mutex  in __ipmi_heartbeat()
619 		rv = -EINVAL;  in __ipmi_heartbeat()
631 		return -ENODEV;  in _ipmi_heartbeat()
639 		 * A pretimeout occurred, make sure we set the timeout.  in _ipmi_heartbeat()
679 		return i ? -EFAULT : 0;  in ipmi_ioctl()
684 			return -EFAULT;  in ipmi_ioctl()
685 		timeout = val;  in ipmi_ioctl()
689 		i = copy_to_user(argp, &timeout, sizeof(timeout));  in ipmi_ioctl()
691 			return -EFAULT;  in ipmi_ioctl()
697 			return -EFAULT;  in ipmi_ioctl()
704 			return -EFAULT;  in ipmi_ioctl()
713 			return -EFAULT;  in ipmi_ioctl()
730 			return -EFAULT;  in ipmi_ioctl()
734 		return -ENOIOCTLCMD;  in ipmi_ioctl()
769 					return -EFAULT;  in ipmi_write()
798 		if (file->f_flags & O_NONBLOCK) {  in ipmi_read()
799 			rv = -EAGAIN;  in ipmi_read()
814 			rv = -ERESTARTSYS;  in ipmi_read()
825 			rv = -EFAULT;  in ipmi_read()
838 			return -EBUSY;  in ipmi_open()
842 		 * Don't start the timer now, let it start on the  in ipmi_open()
849 		return (-ENODEV);  in ipmi_open()
867 static int ipmi_fasync(int fd, struct file *file, int on)  in ipmi_fasync()  argument
871 	result = fasync_helper(fd, file, on, &fasync_q);  in ipmi_fasync()
917 	if (msg->msg.cmd == IPMI_WDOG_RESET_TIMER &&  in ipmi_wdog_msg_handler()
918 			msg->msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP)  in ipmi_wdog_msg_handler()
919 …pr_info("response: The IPMI controller appears to have been reset, will attempt to reinitialize th…  in ipmi_wdog_msg_handler()
920 	else if (msg->msg.data[0] != 0)  in ipmi_wdog_msg_handler()
921 		pr_err("response: Error %x on cmd %x\n",  in ipmi_wdog_msg_handler()
922 		       msg->msg.data[0],  in ipmi_wdog_msg_handler()
923 		       msg->msg.cmd);  in ipmi_wdog_msg_handler()
933 				panic("Watchdog pre-timeout");  in ipmi_wdog_pretimeout_handler()
946 	 * On some machines, the heartbeat will give an error and not  in ipmi_wdog_pretimeout_handler()
947 	 * work unless we re-enable the timer.  So do so.  in ipmi_wdog_pretimeout_handler()
957 	 * On a panic, if we have a panic timeout, make sure to extend  in ipmi_wdog_panic_handler()
967 		timeout = panic_wdt_timeout;  in ipmi_wdog_panic_handler()
981 	int rv = -EBUSY;  in ipmi_register_watchdog()
1016 		int old_timeout = timeout;  in ipmi_register_watchdog()
1026 		timeout = 100;  in ipmi_register_watchdog()
1047 		timeout = old_timeout;  in ipmi_register_watchdog()
1115 	/* If we are not expecting a timeout, ignore it. */  in ipmi_nmi()
1127 		/* On some machines, the heartbeat will give  in ipmi_nmi()
1128 		   an error and not work unless we re-enable  in ipmi_nmi()
1132 			nmi_panic(regs, "pre-timeout");  in ipmi_nmi()
1155 			   reset if it hangs, but only if the watchdog  in wdog_reboot_handler()
1157 			if (timeout < 120)  in wdog_reboot_handler()
1158 				timeout = 120;  in wdog_reboot_handler()
1197 	if (strcmp(inval, "reset") == 0)  in action_op()
1206 		return -EINVAL;  in action_op()
1230 		return -EINVAL;  in preaction_op()
1250 		return -EINVAL;  in preop_op()
1289 		action_op("reset", NULL);  in ipmi_wdog_init()
1290 		pr_info("Unknown action '%s', defaulting to reset\n", action);  in ipmi_wdog_init()