251 строка
6.8 KiB
C
251 строка
6.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _linux_POSIX_TIMERS_H
|
|
#define _linux_POSIX_TIMERS_H
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/list.h>
|
|
#include <linux/alarmtimer.h>
|
|
#include <linux/timerqueue.h>
|
|
#include <linux/task_work.h>
|
|
|
|
struct kernel_siginfo;
|
|
struct task_struct;
|
|
|
|
/*
|
|
* Bit fields within a clockid:
|
|
*
|
|
* The most significant 29 bits hold either a pid or a file descriptor.
|
|
*
|
|
* Bit 2 indicates whether a cpu clock refers to a thread or a process.
|
|
*
|
|
* Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3.
|
|
*
|
|
* A clockid is invalid if bits 2, 1, and 0 are all set.
|
|
*/
|
|
#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
|
|
#define CPUCLOCK_PERTHREAD(clock) \
|
|
(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
|
|
|
|
#define CPUCLOCK_PERTHREAD_MASK 4
|
|
#define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
|
|
#define CPUCLOCK_CLOCK_MASK 3
|
|
#define CPUCLOCK_PROF 0
|
|
#define CPUCLOCK_VIRT 1
|
|
#define CPUCLOCK_SCHED 2
|
|
#define CPUCLOCK_MAX 3
|
|
#define CLOCKFD CPUCLOCK_MAX
|
|
#define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
|
|
|
|
static inline clockid_t make_process_cpuclock(const unsigned int pid,
|
|
const clockid_t clock)
|
|
{
|
|
return ((~pid) << 3) | clock;
|
|
}
|
|
static inline clockid_t make_thread_cpuclock(const unsigned int tid,
|
|
const clockid_t clock)
|
|
{
|
|
return make_process_cpuclock(tid, clock | CPUCLOCK_PERTHREAD_MASK);
|
|
}
|
|
|
|
static inline clockid_t fd_to_clockid(const int fd)
|
|
{
|
|
return make_process_cpuclock((unsigned int) fd, CLOCKFD);
|
|
}
|
|
|
|
static inline int clockid_to_fd(const clockid_t clk)
|
|
{
|
|
return ~(clk >> 3);
|
|
}
|
|
|
|
#ifdef CONFIG_POSIX_TIMERS
|
|
|
|
/**
|
|
* cpu_timer - Posix CPU timer representation for k_itimer
|
|
* @node: timerqueue node to queue in the task/sig
|
|
* @head: timerqueue head on which this timer is queued
|
|
* @task: Pointer to target task
|
|
* @elist: List head for the expiry list
|
|
* @firing: Timer is currently firing
|
|
*/
|
|
struct cpu_timer {
|
|
struct timerqueue_node node;
|
|
struct timerqueue_head *head;
|
|
struct pid *pid;
|
|
struct list_head elist;
|
|
int firing;
|
|
};
|
|
|
|
static inline bool cpu_timer_enqueue(struct timerqueue_head *head,
|
|
struct cpu_timer *ctmr)
|
|
{
|
|
ctmr->head = head;
|
|
return timerqueue_add(head, &ctmr->node);
|
|
}
|
|
|
|
static inline void cpu_timer_dequeue(struct cpu_timer *ctmr)
|
|
{
|
|
if (ctmr->head) {
|
|
timerqueue_del(ctmr->head, &ctmr->node);
|
|
ctmr->head = NULL;
|
|
}
|
|
}
|
|
|
|
static inline u64 cpu_timer_getexpires(struct cpu_timer *ctmr)
|
|
{
|
|
return ctmr->node.expires;
|
|
}
|
|
|
|
static inline void cpu_timer_setexpires(struct cpu_timer *ctmr, u64 exp)
|
|
{
|
|
ctmr->node.expires = exp;
|
|
}
|
|
|
|
/**
|
|
* posix_cputimer_base - Container per posix CPU clock
|
|
* @nextevt: Earliest-expiration cache
|
|
* @tqhead: timerqueue head for cpu_timers
|
|
*/
|
|
struct posix_cputimer_base {
|
|
u64 nextevt;
|
|
struct timerqueue_head tqhead;
|
|
};
|
|
|
|
/**
|
|
* posix_cputimers - Container for posix CPU timer related data
|
|
* @bases: Base container for posix CPU clocks
|
|
* @timers_active: Timers are queued.
|
|
* @expiry_active: Timer expiry is active. Used for
|
|
* process wide timers to avoid multiple
|
|
* task trying to handle expiry concurrently
|
|
*
|
|
* Used in task_struct and signal_struct
|
|
*/
|
|
struct posix_cputimers {
|
|
struct posix_cputimer_base bases[CPUCLOCK_MAX];
|
|
unsigned int timers_active;
|
|
unsigned int expiry_active;
|
|
};
|
|
|
|
/**
|
|
* posix_cputimers_work - Container for task work based posix CPU timer expiry
|
|
* @work: The task work to be scheduled
|
|
* @scheduled: @work has been scheduled already, no further processing
|
|
*/
|
|
struct posix_cputimers_work {
|
|
struct callback_head work;
|
|
unsigned int scheduled;
|
|
};
|
|
|
|
static inline void posix_cputimers_init(struct posix_cputimers *pct)
|
|
{
|
|
memset(pct, 0, sizeof(*pct));
|
|
pct->bases[0].nextevt = U64_MAX;
|
|
pct->bases[1].nextevt = U64_MAX;
|
|
pct->bases[2].nextevt = U64_MAX;
|
|
}
|
|
|
|
void posix_cputimers_group_init(struct posix_cputimers *pct, u64 cpu_limit);
|
|
|
|
static inline void posix_cputimers_rt_watchdog(struct posix_cputimers *pct,
|
|
u64 runtime)
|
|
{
|
|
pct->bases[CPUCLOCK_SCHED].nextevt = runtime;
|
|
}
|
|
|
|
/* Init task static initializer */
|
|
#define INIT_CPU_TIMERBASE(b) { \
|
|
.nextevt = U64_MAX, \
|
|
}
|
|
|
|
#define INIT_CPU_TIMERBASES(b) { \
|
|
INIT_CPU_TIMERBASE(b[0]), \
|
|
INIT_CPU_TIMERBASE(b[1]), \
|
|
INIT_CPU_TIMERBASE(b[2]), \
|
|
}
|
|
|
|
#define INIT_CPU_TIMERS(s) \
|
|
.posix_cputimers = { \
|
|
.bases = INIT_CPU_TIMERBASES(s.posix_cputimers.bases), \
|
|
},
|
|
#else
|
|
struct posix_cputimers { };
|
|
struct cpu_timer { };
|
|
#define INIT_CPU_TIMERS(s)
|
|
static inline void posix_cputimers_init(struct posix_cputimers *pct) { }
|
|
static inline void posix_cputimers_group_init(struct posix_cputimers *pct,
|
|
u64 cpu_limit) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK
|
|
void posix_cputimers_init_work(void);
|
|
#else
|
|
static inline void posix_cputimers_init_work(void) { }
|
|
#endif
|
|
|
|
#define REQUEUE_PENDING 1
|
|
|
|
/**
|
|
* struct k_itimer - POSIX.1b interval timer structure.
|
|
* @list: List head for binding the timer to signals->posix_timers
|
|
* @t_hash: Entry in the posix timer hash table
|
|
* @it_lock: Lock protecting the timer
|
|
* @kclock: Pointer to the k_clock struct handling this timer
|
|
* @it_clock: The posix timer clock id
|
|
* @it_id: The posix timer id for identifying the timer
|
|
* @it_active: Marker that timer is active
|
|
* @it_overrun: The overrun counter for pending signals
|
|
* @it_overrun_last: The overrun at the time of the last delivered signal
|
|
* @it_requeue_pending: Indicator that timer waits for being requeued on
|
|
* signal delivery
|
|
* @it_sigev_notify: The notify word of sigevent struct for signal delivery
|
|
* @it_interval: The interval for periodic timers
|
|
* @it_signal: Pointer to the creators signal struct
|
|
* @it_pid: The pid of the process/task targeted by the signal
|
|
* @it_process: The task to wakeup on clock_nanosleep (CPU timers)
|
|
* @sigq: Pointer to preallocated sigqueue
|
|
* @it: Union representing the various posix timer type
|
|
* internals.
|
|
* @rcu: RCU head for freeing the timer.
|
|
*/
|
|
struct k_itimer {
|
|
struct list_head list;
|
|
struct hlist_node t_hash;
|
|
spinlock_t it_lock;
|
|
const struct k_clock *kclock;
|
|
clockid_t it_clock;
|
|
timer_t it_id;
|
|
int it_active;
|
|
s64 it_overrun;
|
|
s64 it_overrun_last;
|
|
int it_requeue_pending;
|
|
int it_sigev_notify;
|
|
ktime_t it_interval;
|
|
struct signal_struct *it_signal;
|
|
union {
|
|
struct pid *it_pid;
|
|
struct task_struct *it_process;
|
|
};
|
|
struct sigqueue *sigq;
|
|
union {
|
|
struct {
|
|
struct hrtimer timer;
|
|
} real;
|
|
struct cpu_timer cpu;
|
|
struct {
|
|
struct alarm alarmtimer;
|
|
} alarm;
|
|
} it;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
void run_posix_cpu_timers(void);
|
|
void posix_cpu_timers_exit(struct task_struct *task);
|
|
void posix_cpu_timers_exit_group(struct task_struct *task);
|
|
void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
|
|
u64 *newval, u64 *oldval);
|
|
|
|
void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
|
|
|
|
void posixtimer_rearm(struct kernel_siginfo *info);
|
|
#endif
|