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1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
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> | |
8 | #include <linux/timex.h> | |
9 | #include <linux/alarmtimer.h> | |
10 | ||
11 | struct siginfo; | |
12 | ||
13 | struct cpu_timer_list { | |
14 | struct list_head entry; | |
15 | u64 expires, incr; | |
16 | struct task_struct *task; | |
17 | int firing; | |
18 | }; | |
19 | ||
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 | */ | |
31 | #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3)) | |
32 | #define CPUCLOCK_PERTHREAD(clock) \ | |
33 | (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0) | |
34 | ||
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 | |
42 | #define CLOCKFD CPUCLOCK_MAX | |
43 | #define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK) | |
44 | ||
45 | #define MAKE_PROCESS_CPUCLOCK(pid, clock) \ | |
46 | ((~(clockid_t) (pid) << 3) | (clockid_t) (clock)) | |
47 | #define MAKE_THREAD_CPUCLOCK(tid, clock) \ | |
48 | MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK) | |
49 | ||
50 | #define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD) | |
51 | #define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3)) | |
52 | ||
53 | #define REQUEUE_PENDING 1 | |
54 | ||
55 | /** | |
56 | * struct k_itimer - POSIX.1b interval timer structure. | |
57 | * @list: List head for binding the timer to signals->posix_timers | |
58 | * @t_hash: Entry in the posix timer hash table | |
59 | * @it_lock: Lock protecting the timer | |
60 | * @kclock: Pointer to the k_clock struct handling this timer | |
61 | * @it_clock: The posix timer clock id | |
62 | * @it_id: The posix timer id for identifying the timer | |
63 | * @it_active: Marker that timer is active | |
64 | * @it_overrun: The overrun counter for pending signals | |
65 | * @it_overrun_last: The overrun at the time of the last delivered signal | |
66 | * @it_requeue_pending: Indicator that timer waits for being requeued on | |
67 | * signal delivery | |
68 | * @it_sigev_notify: The notify word of sigevent struct for signal delivery | |
69 | * @it_interval: The interval for periodic timers | |
70 | * @it_signal: Pointer to the creators signal struct | |
71 | * @it_pid: The pid of the process/task targeted by the signal | |
72 | * @it_process: The task to wakeup on clock_nanosleep (CPU timers) | |
73 | * @sigq: Pointer to preallocated sigqueue | |
74 | * @it: Union representing the various posix timer type | |
75 | * internals. Also used for rcu freeing the timer. | |
76 | */ | |
77 | struct k_itimer { | |
78 | struct list_head list; | |
79 | struct hlist_node t_hash; | |
80 | spinlock_t it_lock; | |
81 | const struct k_clock *kclock; | |
82 | clockid_t it_clock; | |
83 | timer_t it_id; | |
84 | int it_active; | |
85 | s64 it_overrun; | |
86 | s64 it_overrun_last; | |
87 | int it_requeue_pending; | |
88 | int it_sigev_notify; | |
89 | ktime_t it_interval; | |
90 | struct signal_struct *it_signal; | |
91 | union { | |
92 | struct pid *it_pid; | |
93 | struct task_struct *it_process; | |
94 | }; | |
95 | struct sigqueue *sigq; | |
96 | union { | |
97 | struct { | |
98 | struct hrtimer timer; | |
99 | } real; | |
100 | struct cpu_timer_list cpu; | |
101 | struct { | |
102 | struct alarm alarmtimer; | |
103 | } alarm; | |
104 | struct rcu_head rcu; | |
105 | } it; | |
106 | }; | |
107 | ||
108 | void run_posix_cpu_timers(struct task_struct *task); | |
109 | void posix_cpu_timers_exit(struct task_struct *task); | |
110 | void posix_cpu_timers_exit_group(struct task_struct *task); | |
111 | void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, | |
112 | u64 *newval, u64 *oldval); | |
113 | ||
114 | void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); | |
115 | ||
116 | void posixtimer_rearm(struct siginfo *info); | |
117 | #endif |