Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
7dfb7103 NC |
2 | /* Freezer declarations */ |
3 | ||
83144186 RW |
4 | #ifndef FREEZER_H_INCLUDED |
5 | #define FREEZER_H_INCLUDED | |
6 | ||
0f9548ca | 7 | #include <linux/debug_locks.h> |
5c543eff | 8 | #include <linux/sched.h> |
e42837bc | 9 | #include <linux/wait.h> |
a3201227 | 10 | #include <linux/atomic.h> |
f5d39b02 | 11 | #include <linux/jump_label.h> |
5c543eff | 12 | |
8174f150 | 13 | #ifdef CONFIG_FREEZER |
f5d39b02 PZ |
14 | DECLARE_STATIC_KEY_FALSE(freezer_active); |
15 | ||
a3201227 TH |
16 | extern bool pm_freezing; /* PM freezing in effect */ |
17 | extern bool pm_nosig_freezing; /* PM nosig freezing in effect */ | |
18 | ||
957d1282 LF |
19 | /* |
20 | * Timeout for stopping processes | |
21 | */ | |
22 | extern unsigned int freeze_timeout_msecs; | |
23 | ||
7dfb7103 NC |
24 | /* |
25 | * Check if a process has been frozen | |
26 | */ | |
f5d39b02 | 27 | extern bool frozen(struct task_struct *p); |
7dfb7103 | 28 | |
a3201227 | 29 | extern bool freezing_slow_path(struct task_struct *p); |
7dfb7103 NC |
30 | |
31 | /* | |
a3201227 | 32 | * Check if there is a request to freeze a process |
7dfb7103 | 33 | */ |
a3201227 | 34 | static inline bool freezing(struct task_struct *p) |
7dfb7103 | 35 | { |
f5d39b02 PZ |
36 | if (static_branch_unlikely(&freezer_active)) |
37 | return freezing_slow_path(p); | |
38 | ||
39 | return false; | |
7dfb7103 NC |
40 | } |
41 | ||
dc52ddc0 | 42 | /* Takes and releases task alloc lock using task_lock() */ |
a5be2d0d | 43 | extern void __thaw_task(struct task_struct *t); |
7dfb7103 | 44 | |
8a32c441 | 45 | extern bool __refrigerator(bool check_kthr_stop); |
7dfb7103 | 46 | extern int freeze_processes(void); |
2aede851 | 47 | extern int freeze_kernel_threads(void); |
a9b6f562 | 48 | extern void thaw_processes(void); |
181e9bde | 49 | extern void thaw_kernel_threads(void); |
7dfb7103 | 50 | |
f5d39b02 | 51 | static inline bool try_to_freeze(void) |
7dfb7103 | 52 | { |
a0acae0e TH |
53 | might_sleep(); |
54 | if (likely(!freezing(current))) | |
55 | return false; | |
0f9548ca MSB |
56 | if (!(current->flags & PF_NOFREEZE)) |
57 | debug_check_no_locks_held(); | |
f5d39b02 | 58 | return __refrigerator(false); |
416ad3c9 CC |
59 | } |
60 | ||
839e3407 | 61 | extern bool freeze_task(struct task_struct *p); |
34b087e4 | 62 | extern bool set_freezable(void); |
8174f150 | 63 | |
dc52ddc0 | 64 | #ifdef CONFIG_CGROUP_FREEZER |
22b4e111 | 65 | extern bool cgroup_freezing(struct task_struct *task); |
dc52ddc0 | 66 | #else /* !CONFIG_CGROUP_FREEZER */ |
22b4e111 | 67 | static inline bool cgroup_freezing(struct task_struct *task) |
5a7aadfe | 68 | { |
22b4e111 | 69 | return false; |
5a7aadfe | 70 | } |
dc52ddc0 MH |
71 | #endif /* !CONFIG_CGROUP_FREEZER */ |
72 | ||
8174f150 | 73 | #else /* !CONFIG_FREEZER */ |
948246f7 | 74 | static inline bool frozen(struct task_struct *p) { return false; } |
a3201227 | 75 | static inline bool freezing(struct task_struct *p) { return false; } |
62c9ea6b | 76 | static inline void __thaw_task(struct task_struct *t) {} |
7dfb7103 | 77 | |
8a32c441 | 78 | static inline bool __refrigerator(bool check_kthr_stop) { return false; } |
2aede851 RW |
79 | static inline int freeze_processes(void) { return -ENOSYS; } |
80 | static inline int freeze_kernel_threads(void) { return -ENOSYS; } | |
7dfb7103 | 81 | static inline void thaw_processes(void) {} |
181e9bde | 82 | static inline void thaw_kernel_threads(void) {} |
7dfb7103 | 83 | |
a0acae0e | 84 | static inline bool try_to_freeze(void) { return false; } |
7dfb7103 | 85 | |
83144186 | 86 | static inline void set_freezable(void) {} |
e42837bc | 87 | |
8174f150 | 88 | #endif /* !CONFIG_FREEZER */ |
83144186 RW |
89 | |
90 | #endif /* FREEZER_H_INCLUDED */ |