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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 | ||
5 | #include <linux/spinlock.h> | |
6 | #include <linux/list.h> | |
7 | #include <linux/sched.h> | |
f1f1d5eb | 8 | #include <linux/timex.h> |
9a7adcf5 | 9 | #include <linux/alarmtimer.h> |
1da177e4 | 10 | |
31ea70e0 | 11 | struct siginfo; |
55ccb616 | 12 | |
1da177e4 LT |
13 | struct cpu_timer_list { |
14 | struct list_head entry; | |
16118794 | 15 | u64 expires; |
1da177e4 LT |
16 | struct task_struct *task; |
17 | int firing; | |
18 | }; | |
19 | ||
81e294cb RC |
20 | /* |
21 | * Bit fields within a clockid: | |
22 | * | |
23 | * The most significant 29 bits hold either a pid or a file descriptor. | |
24 | * | |
25 | * Bit 2 indicates whether a cpu clock refers to a thread or a process. | |
26 | * | |
27 | * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3. | |
28 | * | |
29 | * A clockid is invalid if bits 2, 1, and 0 are all set. | |
30 | */ | |
1da177e4 LT |
31 | #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3)) |
32 | #define CPUCLOCK_PERTHREAD(clock) \ | |
33 | (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0) | |
0606f422 | 34 | |
1da177e4 LT |
35 | #define CPUCLOCK_PERTHREAD_MASK 4 |
36 | #define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK) | |
37 | #define CPUCLOCK_CLOCK_MASK 3 | |
38 | #define CPUCLOCK_PROF 0 | |
39 | #define CPUCLOCK_VIRT 1 | |
40 | #define CPUCLOCK_SCHED 2 | |
41 | #define CPUCLOCK_MAX 3 | |
81e294cb RC |
42 | #define CLOCKFD CPUCLOCK_MAX |
43 | #define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK) | |
1da177e4 | 44 | |
29f1b2b0 ND |
45 | static inline clockid_t make_process_cpuclock(const unsigned int pid, |
46 | const clockid_t clock) | |
47 | { | |
48 | return ((~pid) << 3) | clock; | |
49 | } | |
50 | static inline clockid_t make_thread_cpuclock(const unsigned int tid, | |
51 | const clockid_t clock) | |
52 | { | |
53 | return make_process_cpuclock(tid, clock | CPUCLOCK_PERTHREAD_MASK); | |
54 | } | |
1da177e4 | 55 | |
29f1b2b0 ND |
56 | static inline clockid_t fd_to_clockid(const int fd) |
57 | { | |
58 | return make_process_cpuclock((unsigned int) fd, CLOCKFD); | |
59 | } | |
60 | ||
61 | static inline int clockid_to_fd(const clockid_t clk) | |
62 | { | |
63 | return ~(clk >> 3); | |
64 | } | |
0606f422 | 65 | |
1da177e4 | 66 | #define REQUEUE_PENDING 1 |
03676b41 TG |
67 | |
68 | /** | |
69 | * struct k_itimer - POSIX.1b interval timer structure. | |
70 | * @list: List head for binding the timer to signals->posix_timers | |
71 | * @t_hash: Entry in the posix timer hash table | |
72 | * @it_lock: Lock protecting the timer | |
d97bb75d | 73 | * @kclock: Pointer to the k_clock struct handling this timer |
03676b41 TG |
74 | * @it_clock: The posix timer clock id |
75 | * @it_id: The posix timer id for identifying the timer | |
21e55c1f | 76 | * @it_active: Marker that timer is active |
03676b41 TG |
77 | * @it_overrun: The overrun counter for pending signals |
78 | * @it_overrun_last: The overrun at the time of the last delivered signal | |
79 | * @it_requeue_pending: Indicator that timer waits for being requeued on | |
80 | * signal delivery | |
81 | * @it_sigev_notify: The notify word of sigevent struct for signal delivery | |
80105cd0 | 82 | * @it_interval: The interval for periodic timers |
03676b41 TG |
83 | * @it_signal: Pointer to the creators signal struct |
84 | * @it_pid: The pid of the process/task targeted by the signal | |
85 | * @it_process: The task to wakeup on clock_nanosleep (CPU timers) | |
86 | * @sigq: Pointer to preallocated sigqueue | |
87 | * @it: Union representing the various posix timer type | |
88 | * internals. Also used for rcu freeing the timer. | |
89 | */ | |
90 | struct k_itimer { | |
91 | struct list_head list; | |
92 | struct hlist_node t_hash; | |
93 | spinlock_t it_lock; | |
d97bb75d | 94 | const struct k_clock *kclock; |
03676b41 TG |
95 | clockid_t it_clock; |
96 | timer_t it_id; | |
21e55c1f | 97 | int it_active; |
78c9c4df TG |
98 | s64 it_overrun; |
99 | s64 it_overrun_last; | |
03676b41 TG |
100 | int it_requeue_pending; |
101 | int it_sigev_notify; | |
80105cd0 | 102 | ktime_t it_interval; |
03676b41 | 103 | struct signal_struct *it_signal; |
27af4245 | 104 | union { |
03676b41 TG |
105 | struct pid *it_pid; |
106 | struct task_struct *it_process; | |
27af4245 | 107 | }; |
03676b41 | 108 | struct sigqueue *sigq; |
1da177e4 LT |
109 | union { |
110 | struct { | |
03676b41 | 111 | struct hrtimer timer; |
1da177e4 | 112 | } real; |
03676b41 | 113 | struct cpu_timer_list cpu; |
9e264762 | 114 | struct { |
03676b41 | 115 | struct alarm alarmtimer; |
9e264762 | 116 | } alarm; |
03676b41 | 117 | struct rcu_head rcu; |
1da177e4 LT |
118 | } it; |
119 | }; | |
120 | ||
2a698971 TG |
121 | void run_posix_cpu_timers(struct task_struct *task); |
122 | void posix_cpu_timers_exit(struct task_struct *task); | |
123 | void posix_cpu_timers_exit_group(struct task_struct *task); | |
2a698971 | 124 | void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, |
858cf3a8 | 125 | u64 *newval, u64 *oldval); |
1da177e4 | 126 | |
5ab46b34 | 127 | void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); |
f06febc9 | 128 | |
ae7795bc | 129 | void posixtimer_rearm(struct kernel_siginfo *info); |
1da177e4 | 130 | #endif |