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c41fe7cdbd
The initial info message (early in the xen_wdt_init_module() function) is not very useful and we already have a message on successful probe. If the probe fails, additional messages are printed anyway. The version number serves no useful purpose and it ran out of favor upstream anyway. Signed-off-by: Radu Rendec <rrendec@arista.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
217 lines
4.8 KiB
C
217 lines
4.8 KiB
C
/*
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* Xen Watchdog Driver
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*
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* (c) Copyright 2010 Novell, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define DRV_NAME "xen_wdt"
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#include <linux/bug.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/hrtimer.h>
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#include <linux/kernel.h>
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#include <linux/ktime.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/watchdog.h>
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#include <xen/xen.h>
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#include <asm/xen/hypercall.h>
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#include <xen/interface/sched.h>
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static struct platform_device *platform_device;
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static struct sched_watchdog wdt;
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static time64_t wdt_expires;
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#define WATCHDOG_TIMEOUT 60 /* in seconds */
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static unsigned int timeout;
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module_param(timeout, uint, S_IRUGO);
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds "
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"(default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, S_IRUGO);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
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"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static inline time64_t set_timeout(struct watchdog_device *wdd)
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{
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wdt.timeout = wdd->timeout;
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return ktime_get_seconds() + wdd->timeout;
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}
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static int xen_wdt_start(struct watchdog_device *wdd)
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{
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time64_t expires;
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int err;
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expires = set_timeout(wdd);
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if (!wdt.id)
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err = HYPERVISOR_sched_op(SCHEDOP_watchdog, &wdt);
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else
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err = -EBUSY;
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if (err > 0) {
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wdt.id = err;
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wdt_expires = expires;
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err = 0;
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} else
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BUG_ON(!err);
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return err;
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}
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static int xen_wdt_stop(struct watchdog_device *wdd)
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{
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int err = 0;
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wdt.timeout = 0;
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if (wdt.id)
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err = HYPERVISOR_sched_op(SCHEDOP_watchdog, &wdt);
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if (!err)
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wdt.id = 0;
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return err;
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}
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static int xen_wdt_kick(struct watchdog_device *wdd)
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{
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time64_t expires;
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int err;
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expires = set_timeout(wdd);
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if (wdt.id)
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err = HYPERVISOR_sched_op(SCHEDOP_watchdog, &wdt);
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else
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err = -ENXIO;
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if (!err)
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wdt_expires = expires;
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return err;
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}
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static unsigned int xen_wdt_get_timeleft(struct watchdog_device *wdd)
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{
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return wdt_expires - ktime_get_seconds();
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}
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static struct watchdog_info xen_wdt_info = {
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.identity = DRV_NAME,
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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};
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static const struct watchdog_ops xen_wdt_ops = {
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.owner = THIS_MODULE,
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.start = xen_wdt_start,
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.stop = xen_wdt_stop,
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.ping = xen_wdt_kick,
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.get_timeleft = xen_wdt_get_timeleft,
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};
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static struct watchdog_device xen_wdt_dev = {
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.info = &xen_wdt_info,
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.ops = &xen_wdt_ops,
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.timeout = WATCHDOG_TIMEOUT,
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};
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static int xen_wdt_probe(struct platform_device *pdev)
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{
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struct sched_watchdog wd = { .id = ~0 };
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int ret = HYPERVISOR_sched_op(SCHEDOP_watchdog, &wd);
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if (ret == -ENOSYS) {
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dev_err(&pdev->dev, "watchdog not supported by hypervisor\n");
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return -ENODEV;
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}
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if (ret != -EINVAL) {
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dev_err(&pdev->dev, "unexpected hypervisor error (%d)\n", ret);
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return -ENODEV;
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}
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if (watchdog_init_timeout(&xen_wdt_dev, timeout, NULL))
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dev_info(&pdev->dev, "timeout value invalid, using %d\n",
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xen_wdt_dev.timeout);
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watchdog_set_nowayout(&xen_wdt_dev, nowayout);
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watchdog_stop_on_reboot(&xen_wdt_dev);
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watchdog_stop_on_unregister(&xen_wdt_dev);
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ret = devm_watchdog_register_device(&pdev->dev, &xen_wdt_dev);
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if (ret) {
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dev_err(&pdev->dev, "cannot register watchdog device (%d)\n",
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ret);
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return ret;
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}
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dev_info(&pdev->dev, "initialized (timeout=%ds, nowayout=%d)\n",
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xen_wdt_dev.timeout, nowayout);
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return 0;
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}
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static int xen_wdt_suspend(struct platform_device *dev, pm_message_t state)
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{
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typeof(wdt.id) id = wdt.id;
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int rc = xen_wdt_stop(&xen_wdt_dev);
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wdt.id = id;
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return rc;
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}
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static int xen_wdt_resume(struct platform_device *dev)
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{
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if (!wdt.id)
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return 0;
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wdt.id = 0;
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return xen_wdt_start(&xen_wdt_dev);
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}
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static struct platform_driver xen_wdt_driver = {
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.probe = xen_wdt_probe,
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.suspend = xen_wdt_suspend,
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.resume = xen_wdt_resume,
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.driver = {
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.name = DRV_NAME,
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},
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};
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static int __init xen_wdt_init_module(void)
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{
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int err;
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if (!xen_domain())
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return -ENODEV;
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err = platform_driver_register(&xen_wdt_driver);
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if (err)
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return err;
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platform_device = platform_device_register_simple(DRV_NAME,
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-1, NULL, 0);
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if (IS_ERR(platform_device)) {
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err = PTR_ERR(platform_device);
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platform_driver_unregister(&xen_wdt_driver);
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}
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return err;
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}
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static void __exit xen_wdt_cleanup_module(void)
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{
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platform_device_unregister(platform_device);
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platform_driver_unregister(&xen_wdt_driver);
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}
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module_init(xen_wdt_init_module);
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module_exit(xen_wdt_cleanup_module);
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MODULE_AUTHOR("Jan Beulich <jbeulich@novell.com>");
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MODULE_DESCRIPTION("Xen WatchDog Timer Driver");
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MODULE_LICENSE("GPL");
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