Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _linux_POSIX_TIMERS_H |
3 | #define _linux_POSIX_TIMERS_H | |
4 | ||
53d31ba8 | 5 | #include <linux/alarmtimer.h> |
1da177e4 | 6 | #include <linux/list.h> |
f7abf14f | 7 | #include <linux/mutex.h> |
53d31ba8 KO |
8 | #include <linux/posix-timers_types.h> |
9 | #include <linux/spinlock.h> | |
60bda037 | 10 | #include <linux/timerqueue.h> |
1da177e4 | 11 | |
ce03f613 TG |
12 | struct kernel_siginfo; |
13 | struct task_struct; | |
55ccb616 | 14 | |
29f1b2b0 ND |
15 | static inline clockid_t make_process_cpuclock(const unsigned int pid, |
16 | const clockid_t clock) | |
17 | { | |
18 | return ((~pid) << 3) | clock; | |
19 | } | |
20 | static inline clockid_t make_thread_cpuclock(const unsigned int tid, | |
21 | const clockid_t clock) | |
22 | { | |
23 | return make_process_cpuclock(tid, clock | CPUCLOCK_PERTHREAD_MASK); | |
24 | } | |
1da177e4 | 25 | |
29f1b2b0 ND |
26 | static inline clockid_t fd_to_clockid(const int fd) |
27 | { | |
28 | return make_process_cpuclock((unsigned int) fd, CLOCKFD); | |
29 | } | |
30 | ||
31 | static inline int clockid_to_fd(const clockid_t clk) | |
32 | { | |
33 | return ~(clk >> 3); | |
34 | } | |
0606f422 | 35 | |
2b69942f | 36 | #ifdef CONFIG_POSIX_TIMERS |
87dc6448 | 37 | |
60bda037 TG |
38 | /** |
39 | * cpu_timer - Posix CPU timer representation for k_itimer | |
40 | * @node: timerqueue node to queue in the task/sig | |
41 | * @head: timerqueue head on which this timer is queued | |
f7abf14f | 42 | * @pid: Pointer to target task PID |
60bda037 TG |
43 | * @elist: List head for the expiry list |
44 | * @firing: Timer is currently firing | |
f7abf14f | 45 | * @handling: Pointer to the task which handles expiry |
60bda037 TG |
46 | */ |
47 | struct cpu_timer { | |
f7abf14f TG |
48 | struct timerqueue_node node; |
49 | struct timerqueue_head *head; | |
50 | struct pid *pid; | |
51 | struct list_head elist; | |
52 | int firing; | |
53 | struct task_struct __rcu *handling; | |
60bda037 TG |
54 | }; |
55 | ||
60bda037 TG |
56 | static inline bool cpu_timer_enqueue(struct timerqueue_head *head, |
57 | struct cpu_timer *ctmr) | |
58 | { | |
59 | ctmr->head = head; | |
60 | return timerqueue_add(head, &ctmr->node); | |
61 | } | |
62 | ||
ee375328 FW |
63 | static inline bool cpu_timer_queued(struct cpu_timer *ctmr) |
64 | { | |
65 | return !!ctmr->head; | |
66 | } | |
67 | ||
175cc3ab | 68 | static inline bool cpu_timer_dequeue(struct cpu_timer *ctmr) |
60bda037 | 69 | { |
ee375328 | 70 | if (cpu_timer_queued(ctmr)) { |
60bda037 | 71 | timerqueue_del(ctmr->head, &ctmr->node); |
00d9e47f | 72 | ctmr->head = NULL; |
175cc3ab | 73 | return true; |
00d9e47f | 74 | } |
175cc3ab | 75 | return false; |
60bda037 TG |
76 | } |
77 | ||
78 | static inline u64 cpu_timer_getexpires(struct cpu_timer *ctmr) | |
79 | { | |
80 | return ctmr->node.expires; | |
81 | } | |
82 | ||
83 | static inline void cpu_timer_setexpires(struct cpu_timer *ctmr, u64 exp) | |
84 | { | |
85 | ctmr->node.expires = exp; | |
86 | } | |
87 | ||
2b69942f TG |
88 | static inline void posix_cputimers_init(struct posix_cputimers *pct) |
89 | { | |
60bda037 | 90 | memset(pct, 0, sizeof(*pct)); |
2bbdbdae TG |
91 | pct->bases[0].nextevt = U64_MAX; |
92 | pct->bases[1].nextevt = U64_MAX; | |
93 | pct->bases[2].nextevt = U64_MAX; | |
2b69942f TG |
94 | } |
95 | ||
3a245c0f TG |
96 | void posix_cputimers_group_init(struct posix_cputimers *pct, u64 cpu_limit); |
97 | ||
98 | static inline void posix_cputimers_rt_watchdog(struct posix_cputimers *pct, | |
99 | u64 runtime) | |
100 | { | |
87dc6448 | 101 | pct->bases[CPUCLOCK_SCHED].nextevt = runtime; |
3a245c0f TG |
102 | } |
103 | ||
2b69942f | 104 | /* Init task static initializer */ |
87dc6448 | 105 | #define INIT_CPU_TIMERBASE(b) { \ |
2bbdbdae | 106 | .nextevt = U64_MAX, \ |
87dc6448 TG |
107 | } |
108 | ||
109 | #define INIT_CPU_TIMERBASES(b) { \ | |
110 | INIT_CPU_TIMERBASE(b[0]), \ | |
111 | INIT_CPU_TIMERBASE(b[1]), \ | |
112 | INIT_CPU_TIMERBASE(b[2]), \ | |
2b69942f TG |
113 | } |
114 | ||
115 | #define INIT_CPU_TIMERS(s) \ | |
116 | .posix_cputimers = { \ | |
87dc6448 | 117 | .bases = INIT_CPU_TIMERBASES(s.posix_cputimers.bases), \ |
2b69942f TG |
118 | }, |
119 | #else | |
8f2edb4a | 120 | struct cpu_timer { }; |
2b69942f | 121 | #define INIT_CPU_TIMERS(s) |
3a245c0f TG |
122 | static inline void posix_cputimers_init(struct posix_cputimers *pct) { } |
123 | static inline void posix_cputimers_group_init(struct posix_cputimers *pct, | |
124 | u64 cpu_limit) { } | |
2b69942f TG |
125 | #endif |
126 | ||
1fb497dd | 127 | #ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK |
ca7752ca | 128 | void clear_posix_cputimers_work(struct task_struct *p); |
1fb497dd TG |
129 | void posix_cputimers_init_work(void); |
130 | #else | |
ca7752ca | 131 | static inline void clear_posix_cputimers_work(struct task_struct *p) { } |
1fb497dd TG |
132 | static inline void posix_cputimers_init_work(void) { } |
133 | #endif | |
134 | ||
1da177e4 | 135 | #define REQUEUE_PENDING 1 |
03676b41 TG |
136 | |
137 | /** | |
138 | * struct k_itimer - POSIX.1b interval timer structure. | |
139 | * @list: List head for binding the timer to signals->posix_timers | |
140 | * @t_hash: Entry in the posix timer hash table | |
141 | * @it_lock: Lock protecting the timer | |
d97bb75d | 142 | * @kclock: Pointer to the k_clock struct handling this timer |
03676b41 TG |
143 | * @it_clock: The posix timer clock id |
144 | * @it_id: The posix timer id for identifying the timer | |
21e55c1f | 145 | * @it_active: Marker that timer is active |
03676b41 TG |
146 | * @it_overrun: The overrun counter for pending signals |
147 | * @it_overrun_last: The overrun at the time of the last delivered signal | |
148 | * @it_requeue_pending: Indicator that timer waits for being requeued on | |
149 | * signal delivery | |
150 | * @it_sigev_notify: The notify word of sigevent struct for signal delivery | |
80105cd0 | 151 | * @it_interval: The interval for periodic timers |
03676b41 TG |
152 | * @it_signal: Pointer to the creators signal struct |
153 | * @it_pid: The pid of the process/task targeted by the signal | |
154 | * @it_process: The task to wakeup on clock_nanosleep (CPU timers) | |
155 | * @sigq: Pointer to preallocated sigqueue | |
156 | * @it: Union representing the various posix timer type | |
5d99b32a SAS |
157 | * internals. |
158 | * @rcu: RCU head for freeing the timer. | |
03676b41 TG |
159 | */ |
160 | struct k_itimer { | |
161 | struct list_head list; | |
162 | struct hlist_node t_hash; | |
163 | spinlock_t it_lock; | |
d97bb75d | 164 | const struct k_clock *kclock; |
03676b41 TG |
165 | clockid_t it_clock; |
166 | timer_t it_id; | |
21e55c1f | 167 | int it_active; |
78c9c4df TG |
168 | s64 it_overrun; |
169 | s64 it_overrun_last; | |
03676b41 TG |
170 | int it_requeue_pending; |
171 | int it_sigev_notify; | |
80105cd0 | 172 | ktime_t it_interval; |
03676b41 | 173 | struct signal_struct *it_signal; |
27af4245 | 174 | union { |
03676b41 TG |
175 | struct pid *it_pid; |
176 | struct task_struct *it_process; | |
27af4245 | 177 | }; |
03676b41 | 178 | struct sigqueue *sigq; |
1da177e4 LT |
179 | union { |
180 | struct { | |
03676b41 | 181 | struct hrtimer timer; |
1da177e4 | 182 | } real; |
60bda037 | 183 | struct cpu_timer cpu; |
9e264762 | 184 | struct { |
03676b41 | 185 | struct alarm alarmtimer; |
9e264762 | 186 | } alarm; |
1da177e4 | 187 | } it; |
5d99b32a | 188 | struct rcu_head rcu; |
1da177e4 LT |
189 | }; |
190 | ||
dce3e8fd | 191 | void run_posix_cpu_timers(void); |
2a698971 TG |
192 | void posix_cpu_timers_exit(struct task_struct *task); |
193 | void posix_cpu_timers_exit_group(struct task_struct *task); | |
2a698971 | 194 | void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, |
858cf3a8 | 195 | u64 *newval, u64 *oldval); |
1da177e4 | 196 | |
18c91bb2 | 197 | int update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); |
f06febc9 | 198 | |
ae7795bc | 199 | void posixtimer_rearm(struct kernel_siginfo *info); |
1da177e4 | 200 | #endif |