Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 171 insertions, 0 deletions

diff --git a/drivers/watchdog/softdog.c b/drivers/watchdog/softdog.c
new file mode 100644
index 000000000..060740625
--- /dev/null
+++ b/drivers/watchdog/softdog.c
@@ -0,0 +1,171 @@
+/*
+ *	SoftDog:	A Software Watchdog Device
+ *
+ *	(c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
+ *							All Rights Reserved.
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ *
+ *	Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
+ *	warranty for any of this software. This material is provided
+ *	"AS-IS" and at no charge.
+ *
+ *	(c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ *	Software only watchdog driver. Unlike its big brother the WDT501P
+ *	driver this won't always recover a failed machine.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/hrtimer.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/reboot.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+#define TIMER_MARGIN	60		/* Default is 60 seconds */
+static unsigned int soft_margin = TIMER_MARGIN;	/* in seconds */
+module_param(soft_margin, uint, 0);
+MODULE_PARM_DESC(soft_margin,
+	"Watchdog soft_margin in seconds. (0 < soft_margin < 65536, default="
+					__MODULE_STRING(TIMER_MARGIN) ")");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		"Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int soft_noboot;
+module_param(soft_noboot, int, 0);
+MODULE_PARM_DESC(soft_noboot,
+	"Softdog action, set to 1 to ignore reboots, 0 to reboot (default=0)");
+
+static int soft_panic;
+module_param(soft_panic, int, 0);
+MODULE_PARM_DESC(soft_panic,
+	"Softdog action, set to 1 to panic, 0 to reboot (default=0)");
+
+static struct hrtimer softdog_ticktock;
+static struct hrtimer softdog_preticktock;
+
+static enum hrtimer_restart softdog_fire(struct hrtimer *timer)
+{
+	module_put(THIS_MODULE);
+	if (soft_noboot) {
+		pr_crit("Triggered - Reboot ignored\n");
+	} else if (soft_panic) {
+		pr_crit("Initiating panic\n");
+		panic("Software Watchdog Timer expired");
+	} else {
+		pr_crit("Initiating system reboot\n");
+		emergency_restart();
+		pr_crit("Reboot didn't ?????\n");
+	}
+
+	return HRTIMER_NORESTART;
+}
+
+static struct watchdog_device softdog_dev;
+
+static enum hrtimer_restart softdog_pretimeout(struct hrtimer *timer)
+{
+	watchdog_notify_pretimeout(&softdog_dev);
+
+	return HRTIMER_NORESTART;
+}
+
+static int softdog_ping(struct watchdog_device *w)
+{
+	if (!hrtimer_active(&softdog_ticktock))
+		__module_get(THIS_MODULE);
+	hrtimer_start(&softdog_ticktock, ktime_set(w->timeout, 0),
+		      HRTIMER_MODE_REL);
+
+	if (IS_ENABLED(CONFIG_SOFT_WATCHDOG_PRETIMEOUT)) {
+		if (w->pretimeout)
+			hrtimer_start(&softdog_preticktock,
+				      ktime_set(w->timeout - w->pretimeout, 0),
+				      HRTIMER_MODE_REL);
+		else
+			hrtimer_cancel(&softdog_preticktock);
+	}
+
+	return 0;
+}
+
+static int softdog_stop(struct watchdog_device *w)
+{
+	if (hrtimer_cancel(&softdog_ticktock))
+		module_put(THIS_MODULE);
+
+	if (IS_ENABLED(CONFIG_SOFT_WATCHDOG_PRETIMEOUT))
+		hrtimer_cancel(&softdog_preticktock);
+
+	return 0;
+}
+
+static struct watchdog_info softdog_info = {
+	.identity = "Software Watchdog",
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+};
+
+static const struct watchdog_ops softdog_ops = {
+	.owner = THIS_MODULE,
+	.start = softdog_ping,
+	.stop = softdog_stop,
+};
+
+static struct watchdog_device softdog_dev = {
+	.info = &softdog_info,
+	.ops = &softdog_ops,
+	.min_timeout = 1,
+	.max_timeout = 65535,
+	.timeout = TIMER_MARGIN,
+};
+
+static int __init softdog_init(void)
+{
+	int ret;
+
+	watchdog_init_timeout(&softdog_dev, soft_margin, NULL);
+	watchdog_set_nowayout(&softdog_dev, nowayout);
+	watchdog_stop_on_reboot(&softdog_dev);
+
+	hrtimer_init(&softdog_ticktock, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	softdog_ticktock.function = softdog_fire;
+
+	if (IS_ENABLED(CONFIG_SOFT_WATCHDOG_PRETIMEOUT)) {
+		softdog_info.options |= WDIOF_PRETIMEOUT;
+		hrtimer_init(&softdog_preticktock, CLOCK_MONOTONIC,
+			     HRTIMER_MODE_REL);
+		softdog_preticktock.function = softdog_pretimeout;
+	}
+
+	ret = watchdog_register_device(&softdog_dev);
+	if (ret)
+		return ret;
+
+	pr_info("initialized. soft_noboot=%d soft_margin=%d sec soft_panic=%d (nowayout=%d)\n",
+		soft_noboot, softdog_dev.timeout, soft_panic, nowayout);
+
+	return 0;
+}
+module_init(softdog_init);
+
+static void __exit softdog_exit(void)
+{
+	watchdog_unregister_device(&softdog_dev);
+}
+module_exit(softdog_exit);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("Software Watchdog Device Driver");
+MODULE_LICENSE("GPL");