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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _linux_POSIX_TIMERS_TYPES_H
#define _linux_POSIX_TIMERS_TYPES_H
#include <linux/mutex_types.h>
#include <linux/timerqueue_types.h>
#include <linux/types.h>
/*
* 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)
#ifdef CONFIG_POSIX_TIMERS
/**
* 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
* @mutex: Mutex held around expiry in context of this task work
* @scheduled: @work has been scheduled already, no further processing
*/
struct posix_cputimers_work {
struct callback_head work;
struct mutex mutex;
unsigned int scheduled;
};
#else /* CONFIG_POSIX_TIMERS */
struct posix_cputimers { };
#endif /* CONFIG_POSIX_TIMERS */
#endif /* _linux_POSIX_TIMERS_TYPES_H */
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