82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* watchdog_core.h
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*
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* (c) Copyright 2008-2011 Alan Cox <alan@lxorguk.ukuu.org.uk>,
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* All Rights Reserved.
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*
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* (c) Copyright 2008-2011 Wim Van Sebroeck <wim@iguana.be>.
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*
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* (c) Copyright 2021 Hewlett Packard Enterprise Development LP.
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*
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* This source code is part of the generic code that can be used
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* by all the watchdog timer drivers.
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*
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* Based on source code of the following authors:
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* Matt Domsch <Matt_Domsch@dell.com>,
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* Rob Radez <rob@osinvestor.com>,
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* Rusty Lynch <rusty@linux.co.intel.com>
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* Satyam Sharma <satyam@infradead.org>
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* Randy Dunlap <randy.dunlap@oracle.com>
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*
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* Neither Alan Cox, CymruNet Ltd., Wim Van Sebroeck nor Iguana vzw.
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* admit liability nor provide warranty for any of this software.
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* This material is provided "AS-IS" and at no charge.
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*/
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#include <linux/hrtimer.h>
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#include <linux/kthread.h>
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#define MAX_DOGS 32 /* Maximum number of watchdog devices */
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/*
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* struct watchdog_core_data - watchdog core internal data
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* @dev: The watchdog's internal device
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* @cdev: The watchdog's Character device.
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* @wdd: Pointer to watchdog device.
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* @lock: Lock for watchdog core.
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* @status: Watchdog core internal status bits.
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*/
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struct watchdog_core_data {
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struct device dev;
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struct cdev cdev;
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struct watchdog_device *wdd;
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struct mutex lock;
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ktime_t last_keepalive;
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ktime_t last_hw_keepalive;
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ktime_t open_deadline;
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struct hrtimer timer;
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struct kthread_work work;
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#if IS_ENABLED(CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT)
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struct hrtimer pretimeout_timer;
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#endif
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unsigned long status; /* Internal status bits */
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#define _WDOG_DEV_OPEN 0 /* Opened ? */
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#define _WDOG_ALLOW_RELEASE 1 /* Did we receive the magic char ? */
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#define _WDOG_KEEPALIVE 2 /* Did we receive a keepalive ? */
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};
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/*
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* Functions/procedures to be called by the core
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*/
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extern int watchdog_dev_register(struct watchdog_device *);
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extern void watchdog_dev_unregister(struct watchdog_device *);
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extern int __init watchdog_dev_init(void);
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extern void __exit watchdog_dev_exit(void);
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static inline bool watchdog_have_pretimeout(struct watchdog_device *wdd)
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{
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return wdd->info->options & WDIOF_PRETIMEOUT ||
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IS_ENABLED(CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT);
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}
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#if IS_ENABLED(CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT)
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void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd);
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void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd);
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void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd);
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#else
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static inline void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd) {}
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static inline void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd) {}
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static inline void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd) {}
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#endif
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