1 #ifndef _linux_POSIX_TIMERS_H 2 #define _linux_POSIX_TIMERS_H 3 4 #include <linux/spinlock.h> 5 #include <linux/list.h> 6 #include <linux/sched.h> 7 #include <linux/timex.h> 8 #include <linux/alarmtimer.h> 9 10 11 struct cpu_timer_list { 12 struct list_head entry; 13 u64 expires, incr; 14 struct task_struct *task; 15 int firing; 16 }; 17 18 /* 19 * Bit fields within a clockid: 20 * 21 * The most significant 29 bits hold either a pid or a file descriptor. 22 * 23 * Bit 2 indicates whether a cpu clock refers to a thread or a process. 24 * 25 * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3. 26 * 27 * A clockid is invalid if bits 2, 1, and 0 are all set. 28 */ 29 #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3)) 30 #define CPUCLOCK_PERTHREAD(clock) \ 31 (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0) 32 33 #define CPUCLOCK_PERTHREAD_MASK 4 34 #define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK) 35 #define CPUCLOCK_CLOCK_MASK 3 36 #define CPUCLOCK_PROF 0 37 #define CPUCLOCK_VIRT 1 38 #define CPUCLOCK_SCHED 2 39 #define CPUCLOCK_MAX 3 40 #define CLOCKFD CPUCLOCK_MAX 41 #define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK) 42 43 #define MAKE_PROCESS_CPUCLOCK(pid, clock) \ 44 ((~(clockid_t) (pid) << 3) | (clockid_t) (clock)) 45 #define MAKE_THREAD_CPUCLOCK(tid, clock) \ 46 MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK) 47 48 #define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD) 49 #define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3)) 50 51 /* POSIX.1b interval timer structure. */ 52 struct k_itimer { 53 struct list_head list; /* free/ allocate list */ 54 struct hlist_node t_hash; 55 spinlock_t it_lock; 56 clockid_t it_clock; /* which timer type */ 57 timer_t it_id; /* timer id */ 58 int it_overrun; /* overrun on pending signal */ 59 int it_overrun_last; /* overrun on last delivered signal */ 60 int it_requeue_pending; /* waiting to requeue this timer */ 61 #define REQUEUE_PENDING 1 62 int it_sigev_notify; /* notify word of sigevent struct */ 63 struct signal_struct *it_signal; 64 union { 65 struct pid *it_pid; /* pid of process to send signal to */ 66 struct task_struct *it_process; /* for clock_nanosleep */ 67 }; 68 struct sigqueue *sigq; /* signal queue entry. */ 69 union { 70 struct { 71 struct hrtimer timer; 72 ktime_t interval; 73 } real; 74 struct cpu_timer_list cpu; 75 struct { 76 unsigned int clock; 77 unsigned int node; 78 unsigned long incr; 79 unsigned long expires; 80 } mmtimer; 81 struct { 82 struct alarm alarmtimer; 83 ktime_t interval; 84 } alarm; 85 struct rcu_head rcu; 86 } it; 87 }; 88 89 struct k_clock { 90 int (*clock_getres) (const clockid_t which_clock, struct timespec64 *tp); 91 int (*clock_set) (const clockid_t which_clock, 92 const struct timespec64 *tp); 93 int (*clock_get) (const clockid_t which_clock, struct timespec64 *tp); 94 int (*clock_adj) (const clockid_t which_clock, struct timex *tx); 95 int (*timer_create) (struct k_itimer *timer); 96 int (*nsleep) (const clockid_t which_clock, int flags, 97 struct timespec64 *, struct timespec __user *); 98 long (*nsleep_restart) (struct restart_block *restart_block); 99 int (*timer_set) (struct k_itimer *timr, int flags, 100 struct itimerspec64 *new_setting, 101 struct itimerspec64 *old_setting); 102 int (*timer_del) (struct k_itimer *timr); 103 #define TIMER_RETRY 1 104 void (*timer_get) (struct k_itimer *timr, 105 struct itimerspec64 *cur_setting); 106 }; 107 108 extern struct k_clock clock_posix_cpu; 109 extern struct k_clock clock_posix_dynamic; 110 111 void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock); 112 113 /* function to call to trigger timer event */ 114 int posix_timer_event(struct k_itimer *timr, int si_private); 115 116 void posix_cpu_timer_schedule(struct k_itimer *timer); 117 118 void run_posix_cpu_timers(struct task_struct *task); 119 void posix_cpu_timers_exit(struct task_struct *task); 120 void posix_cpu_timers_exit_group(struct task_struct *task); 121 void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, 122 u64 *newval, u64 *oldval); 123 124 long clock_nanosleep_restart(struct restart_block *restart_block); 125 126 void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); 127 128 #endif 129