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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> | |
9a7adcf5 | 7 | #include <linux/alarmtimer.h> |
1da177e4 | 8 | |
ce03f613 TG |
9 | struct kernel_siginfo; |
10 | struct task_struct; | |
55ccb616 | 11 | |
1da177e4 LT |
12 | struct cpu_timer_list { |
13 | struct list_head entry; | |
16118794 | 14 | u64 expires; |
1da177e4 LT |
15 | struct task_struct *task; |
16 | int firing; | |
17 | }; | |
18 | ||
81e294cb RC |
19 | /* |
20 | * Bit fields within a clockid: | |
21 | * | |
22 | * The most significant 29 bits hold either a pid or a file descriptor. | |
23 | * | |
24 | * Bit 2 indicates whether a cpu clock refers to a thread or a process. | |
25 | * | |
26 | * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3. | |
27 | * | |
28 | * A clockid is invalid if bits 2, 1, and 0 are all set. | |
29 | */ | |
1da177e4 LT |
30 | #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3)) |
31 | #define CPUCLOCK_PERTHREAD(clock) \ | |
32 | (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0) | |
0606f422 | 33 | |
1da177e4 LT |
34 | #define CPUCLOCK_PERTHREAD_MASK 4 |
35 | #define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK) | |
36 | #define CPUCLOCK_CLOCK_MASK 3 | |
37 | #define CPUCLOCK_PROF 0 | |
38 | #define CPUCLOCK_VIRT 1 | |
39 | #define CPUCLOCK_SCHED 2 | |
40 | #define CPUCLOCK_MAX 3 | |
81e294cb RC |
41 | #define CLOCKFD CPUCLOCK_MAX |
42 | #define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK) | |
1da177e4 | 43 | |
29f1b2b0 ND |
44 | static inline clockid_t make_process_cpuclock(const unsigned int pid, |
45 | const clockid_t clock) | |
46 | { | |
47 | return ((~pid) << 3) | clock; | |
48 | } | |
49 | static inline clockid_t make_thread_cpuclock(const unsigned int tid, | |
50 | const clockid_t clock) | |
51 | { | |
52 | return make_process_cpuclock(tid, clock | CPUCLOCK_PERTHREAD_MASK); | |
53 | } | |
1da177e4 | 54 | |
29f1b2b0 ND |
55 | static inline clockid_t fd_to_clockid(const int fd) |
56 | { | |
57 | return make_process_cpuclock((unsigned int) fd, CLOCKFD); | |
58 | } | |
59 | ||
60 | static inline int clockid_to_fd(const clockid_t clk) | |
61 | { | |
62 | return ~(clk >> 3); | |
63 | } | |
0606f422 | 64 | |
2b69942f TG |
65 | #ifdef CONFIG_POSIX_TIMERS |
66 | /** | |
67 | * posix_cputimers - Container for posix CPU timer related data | |
11b8462f | 68 | * @expiries: Earliest-expiration cache array based |
2b69942f TG |
69 | * @cpu_timers: List heads to queue posix CPU timers |
70 | * | |
71 | * Used in task_struct and signal_struct | |
72 | */ | |
73 | struct posix_cputimers { | |
46b88399 TG |
74 | u64 expiries[CPUCLOCK_MAX]; |
75 | struct list_head cpu_timers[CPUCLOCK_MAX]; | |
2b69942f TG |
76 | }; |
77 | ||
78 | static inline void posix_cputimers_init(struct posix_cputimers *pct) | |
79 | { | |
11b8462f | 80 | memset(&pct->expiries, 0, sizeof(pct->expiries)); |
2b69942f TG |
81 | INIT_LIST_HEAD(&pct->cpu_timers[0]); |
82 | INIT_LIST_HEAD(&pct->cpu_timers[1]); | |
83 | INIT_LIST_HEAD(&pct->cpu_timers[2]); | |
84 | } | |
85 | ||
3a245c0f TG |
86 | void posix_cputimers_group_init(struct posix_cputimers *pct, u64 cpu_limit); |
87 | ||
88 | static inline void posix_cputimers_rt_watchdog(struct posix_cputimers *pct, | |
89 | u64 runtime) | |
90 | { | |
11b8462f | 91 | pct->expiries[CPUCLOCK_SCHED] = runtime; |
3a245c0f TG |
92 | } |
93 | ||
2b69942f TG |
94 | /* Init task static initializer */ |
95 | #define INIT_CPU_TIMERLISTS(c) { \ | |
96 | LIST_HEAD_INIT(c.cpu_timers[0]), \ | |
97 | LIST_HEAD_INIT(c.cpu_timers[1]), \ | |
98 | LIST_HEAD_INIT(c.cpu_timers[2]), \ | |
99 | } | |
100 | ||
101 | #define INIT_CPU_TIMERS(s) \ | |
102 | .posix_cputimers = { \ | |
103 | .cpu_timers = INIT_CPU_TIMERLISTS(s.posix_cputimers), \ | |
104 | }, | |
105 | #else | |
106 | struct posix_cputimers { }; | |
107 | #define INIT_CPU_TIMERS(s) | |
3a245c0f TG |
108 | static inline void posix_cputimers_init(struct posix_cputimers *pct) { } |
109 | static inline void posix_cputimers_group_init(struct posix_cputimers *pct, | |
110 | u64 cpu_limit) { } | |
2b69942f TG |
111 | #endif |
112 | ||
1da177e4 | 113 | #define REQUEUE_PENDING 1 |
03676b41 TG |
114 | |
115 | /** | |
116 | * struct k_itimer - POSIX.1b interval timer structure. | |
117 | * @list: List head for binding the timer to signals->posix_timers | |
118 | * @t_hash: Entry in the posix timer hash table | |
119 | * @it_lock: Lock protecting the timer | |
d97bb75d | 120 | * @kclock: Pointer to the k_clock struct handling this timer |
03676b41 TG |
121 | * @it_clock: The posix timer clock id |
122 | * @it_id: The posix timer id for identifying the timer | |
21e55c1f | 123 | * @it_active: Marker that timer is active |
03676b41 TG |
124 | * @it_overrun: The overrun counter for pending signals |
125 | * @it_overrun_last: The overrun at the time of the last delivered signal | |
126 | * @it_requeue_pending: Indicator that timer waits for being requeued on | |
127 | * signal delivery | |
128 | * @it_sigev_notify: The notify word of sigevent struct for signal delivery | |
80105cd0 | 129 | * @it_interval: The interval for periodic timers |
03676b41 TG |
130 | * @it_signal: Pointer to the creators signal struct |
131 | * @it_pid: The pid of the process/task targeted by the signal | |
132 | * @it_process: The task to wakeup on clock_nanosleep (CPU timers) | |
133 | * @sigq: Pointer to preallocated sigqueue | |
134 | * @it: Union representing the various posix timer type | |
5d99b32a SAS |
135 | * internals. |
136 | * @rcu: RCU head for freeing the timer. | |
03676b41 TG |
137 | */ |
138 | struct k_itimer { | |
139 | struct list_head list; | |
140 | struct hlist_node t_hash; | |
141 | spinlock_t it_lock; | |
d97bb75d | 142 | const struct k_clock *kclock; |
03676b41 TG |
143 | clockid_t it_clock; |
144 | timer_t it_id; | |
21e55c1f | 145 | int it_active; |
78c9c4df TG |
146 | s64 it_overrun; |
147 | s64 it_overrun_last; | |
03676b41 TG |
148 | int it_requeue_pending; |
149 | int it_sigev_notify; | |
80105cd0 | 150 | ktime_t it_interval; |
03676b41 | 151 | struct signal_struct *it_signal; |
27af4245 | 152 | union { |
03676b41 TG |
153 | struct pid *it_pid; |
154 | struct task_struct *it_process; | |
27af4245 | 155 | }; |
03676b41 | 156 | struct sigqueue *sigq; |
1da177e4 LT |
157 | union { |
158 | struct { | |
03676b41 | 159 | struct hrtimer timer; |
1da177e4 | 160 | } real; |
03676b41 | 161 | struct cpu_timer_list cpu; |
9e264762 | 162 | struct { |
03676b41 | 163 | struct alarm alarmtimer; |
9e264762 | 164 | } alarm; |
1da177e4 | 165 | } it; |
5d99b32a | 166 | struct rcu_head rcu; |
1da177e4 LT |
167 | }; |
168 | ||
dce3e8fd | 169 | void run_posix_cpu_timers(void); |
2a698971 TG |
170 | void posix_cpu_timers_exit(struct task_struct *task); |
171 | void posix_cpu_timers_exit_group(struct task_struct *task); | |
2a698971 | 172 | void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, |
858cf3a8 | 173 | u64 *newval, u64 *oldval); |
1da177e4 | 174 | |
5ab46b34 | 175 | void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); |
f06febc9 | 176 | |
ae7795bc | 177 | void posixtimer_rearm(struct kernel_siginfo *info); |
1da177e4 | 178 | #endif |