| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
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| 2 | /* |
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| 3 | * watchdog_core.h |
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| 4 | * |
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| 5 | * (c) Copyright 2008-2011 Alan Cox <alan@lxorguk.ukuu.org.uk>, |
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| 6 | * All Rights Reserved. |
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| 7 | * |
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| 8 | * (c) Copyright 2008-2011 Wim Van Sebroeck <wim@iguana.be>. |
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| 9 | * |
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| 10 | * (c) Copyright 2021 Hewlett Packard Enterprise Development LP. |
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| 11 | * |
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| 12 | * This source code is part of the generic code that can be used |
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| 13 | * by all the watchdog timer drivers. |
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| 14 | * |
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| 15 | * Based on source code of the following authors: |
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| 16 | * Matt Domsch <Matt_Domsch@dell.com>, |
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| 17 | * Rob Radez <rob@osinvestor.com>, |
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| 18 | * Rusty Lynch <rusty@linux.co.intel.com> |
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| 19 | * Satyam Sharma <satyam@infradead.org> |
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| 20 | * Randy Dunlap <randy.dunlap@oracle.com> |
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| 21 | * |
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| 22 | * Neither Alan Cox, CymruNet Ltd., Wim Van Sebroeck nor Iguana vzw. |
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| 23 | * admit liability nor provide warranty for any of this software. |
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| 24 | * This material is provided "AS-IS" and at no charge. |
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| 25 | */ |
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| 26 | |
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| 27 | #include <linux/hrtimer.h> |
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| 28 | #include <linux/kthread.h> |
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| 29 | |
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| 30 | #define MAX_DOGS 32 /* Maximum number of watchdog devices */ |
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| 31 | |
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| 32 | /* |
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| 33 | * struct watchdog_core_data - watchdog core internal data |
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| 34 | * @dev: The watchdog's internal device |
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| 35 | * @cdev: The watchdog's Character device. |
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| 36 | * @wdd: Pointer to watchdog device. |
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| 37 | * @lock: Lock for watchdog core. |
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| 38 | * @status: Watchdog core internal status bits. |
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| 39 | */ |
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| 40 | struct watchdog_core_data { |
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| 41 | struct device dev; |
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| 42 | struct cdev cdev; |
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| 43 | struct watchdog_device *wdd; |
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| 44 | struct mutex lock; |
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| 45 | ktime_t last_keepalive; |
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| 46 | ktime_t last_hw_keepalive; |
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| 47 | ktime_t open_deadline; |
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| 48 | struct hrtimer timer; |
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| 49 | struct kthread_work work; |
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| 50 | #if IS_ENABLED(CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT) |
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| 51 | struct hrtimer pretimeout_timer; |
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| 52 | #endif |
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| 53 | unsigned long status; /* Internal status bits */ |
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| 54 | #define _WDOG_DEV_OPEN 0 /* Opened ? */ |
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| 55 | #define _WDOG_ALLOW_RELEASE 1 /* Did we receive the magic char ? */ |
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| 56 | #define _WDOG_KEEPALIVE 2 /* Did we receive a keepalive ? */ |
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| 57 | }; |
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| 58 | |
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| 59 | /* |
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| 60 | * Functions/procedures to be called by the core |
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| 61 | */ |
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| 62 | extern int watchdog_dev_register(struct watchdog_device *); |
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| 63 | extern void watchdog_dev_unregister(struct watchdog_device *); |
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| 64 | extern int __init watchdog_dev_init(void); |
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| 65 | extern void __exit watchdog_dev_exit(void); |
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| 66 | |
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| 67 | static inline bool watchdog_have_pretimeout(struct watchdog_device *wdd) |
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| 68 | { |
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| 69 | return wdd->info->options & WDIOF_PRETIMEOUT || |
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| 70 | IS_ENABLED(CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT); |
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| 71 | } |
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| 72 | |
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| 73 | #if IS_ENABLED(CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT) |
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| 74 | void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd); |
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| 75 | void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd); |
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| 76 | void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd); |
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| 77 | #else |
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| 78 | static inline void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd) {} |
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| 79 | static inline void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd) {} |
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| 80 | static inline void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd) {} |
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| 81 | #endif |
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| 82 | |
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