// SPDX-License-Identifier: GPL-2.0+
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/*
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* 2002-10-15 Posix Clocks & timers
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* by George Anzinger george@mvista.com
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* Copyright (C) 2002 2003 by MontaVista Software.
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*
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* 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug.
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* Copyright (C) 2004 Boris Hu
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*
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* These are all the functions necessary to implement POSIX clocks & timers
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*/
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/mutex.h>
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#include <linux/sched/task.h>
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#include <linux/uaccess.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/compiler.h>
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#include <linux/hash.h>
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#include <linux/posix-clock.h>
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#include <linux/posix-timers.h>
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#include <linux/syscalls.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/export.h>
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#include <linux/hashtable.h>
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#include <linux/compat.h>
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#include <linux/nospec.h>
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#include <linux/time_namespace.h>
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#include "timekeeping.h"
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#include "posix-timers.h"
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/*
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* Management arrays for POSIX timers. Timers are now kept in static hash table
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* with 512 entries.
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* Timer ids are allocated by local routine, which selects proper hash head by
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* key, constructed from current->signal address and per signal struct counter.
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* This keeps timer ids unique per process, but now they can intersect between
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* processes.
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*/
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/*
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* Lets keep our timers in a slab cache :-)
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*/
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static struct kmem_cache *posix_timers_cache;
|
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static DEFINE_HASHTABLE(posix_timers_hashtable, 9);
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static DEFINE_SPINLOCK(hash_lock);
|
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static const struct k_clock * const posix_clocks[];
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static const struct k_clock *clockid_to_kclock(const clockid_t id);
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static const struct k_clock clock_realtime, clock_monotonic;
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/*
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* we assume that the new SIGEV_THREAD_ID shares no bits with the other
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* SIGEV values. Here we put out an error if this assumption fails.
|
*/
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#if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \
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~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD))
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#error "SIGEV_THREAD_ID must not share bit with other SIGEV values!"
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#endif
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/*
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* The timer ID is turned into a timer address by idr_find().
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* Verifying a valid ID consists of:
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*
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* a) checking that idr_find() returns other than -1.
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* b) checking that the timer id matches the one in the timer itself.
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* c) that the timer owner is in the callers thread group.
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*/
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/*
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* CLOCKs: The POSIX standard calls for a couple of clocks and allows us
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* to implement others. This structure defines the various
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* clocks.
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*
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* RESOLUTION: Clock resolution is used to round up timer and interval
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* times, NOT to report clock times, which are reported with as
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* much resolution as the system can muster. In some cases this
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* resolution may depend on the underlying clock hardware and
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* may not be quantifiable until run time, and only then is the
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* necessary code is written. The standard says we should say
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* something about this issue in the documentation...
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*
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* FUNCTIONS: The CLOCKs structure defines possible functions to
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* handle various clock functions.
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*
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* The standard POSIX timer management code assumes the
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* following: 1.) The k_itimer struct (sched.h) is used for
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* the timer. 2.) The list, it_lock, it_clock, it_id and
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* it_pid fields are not modified by timer code.
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*
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* Permissions: It is assumed that the clock_settime() function defined
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* for each clock will take care of permission checks. Some
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* clocks may be set able by any user (i.e. local process
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* clocks) others not. Currently the only set able clock we
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* have is CLOCK_REALTIME and its high res counter part, both of
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* which we beg off on and pass to do_sys_settimeofday().
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*/
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static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags);
|
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#define lock_timer(tid, flags) \
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({ struct k_itimer *__timr; \
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__cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \
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__timr; \
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})
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static int hash(struct signal_struct *sig, unsigned int nr)
|
{
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return hash_32(hash32_ptr(sig) ^ nr, HASH_BITS(posix_timers_hashtable));
|
}
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static struct k_itimer *__posix_timers_find(struct hlist_head *head,
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struct signal_struct *sig,
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timer_t id)
|
{
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struct k_itimer *timer;
|
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hlist_for_each_entry_rcu(timer, head, t_hash,
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lockdep_is_held(&hash_lock)) {
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if ((timer->it_signal == sig) && (timer->it_id == id))
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return timer;
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}
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return NULL;
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}
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static struct k_itimer *posix_timer_by_id(timer_t id)
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{
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struct signal_struct *sig = current->signal;
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struct hlist_head *head = &posix_timers_hashtable[hash(sig, id)];
|
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return __posix_timers_find(head, sig, id);
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}
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static int posix_timer_add(struct k_itimer *timer)
|
{
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struct signal_struct *sig = current->signal;
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int first_free_id = sig->posix_timer_id;
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struct hlist_head *head;
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int ret = -ENOENT;
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|
do {
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spin_lock(&hash_lock);
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head = &posix_timers_hashtable[hash(sig, sig->posix_timer_id)];
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if (!__posix_timers_find(head, sig, sig->posix_timer_id)) {
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hlist_add_head_rcu(&timer->t_hash, head);
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ret = sig->posix_timer_id;
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}
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if (++sig->posix_timer_id < 0)
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sig->posix_timer_id = 0;
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if ((sig->posix_timer_id == first_free_id) && (ret == -ENOENT))
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/* Loop over all possible ids completed */
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ret = -EAGAIN;
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spin_unlock(&hash_lock);
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} while (ret == -ENOENT);
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return ret;
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}
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static inline void unlock_timer(struct k_itimer *timr, unsigned long flags)
|
{
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spin_unlock_irqrestore(&timr->it_lock, flags);
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}
|
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/* Get clock_realtime */
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static int posix_get_realtime_timespec(clockid_t which_clock, struct timespec64 *tp)
|
{
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ktime_get_real_ts64(tp);
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return 0;
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}
|
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static ktime_t posix_get_realtime_ktime(clockid_t which_clock)
|
{
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return ktime_get_real();
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}
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/* Set clock_realtime */
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static int posix_clock_realtime_set(const clockid_t which_clock,
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const struct timespec64 *tp)
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{
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return do_sys_settimeofday64(tp, NULL);
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}
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static int posix_clock_realtime_adj(const clockid_t which_clock,
|
struct __kernel_timex *t)
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{
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return do_adjtimex(t);
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}
|
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/*
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* Get monotonic time for posix timers
|
*/
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static int posix_get_monotonic_timespec(clockid_t which_clock, struct timespec64 *tp)
|
{
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ktime_get_ts64(tp);
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timens_add_monotonic(tp);
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return 0;
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}
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static ktime_t posix_get_monotonic_ktime(clockid_t which_clock)
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{
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return ktime_get();
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}
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/*
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* Get monotonic-raw time for posix timers
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*/
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static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec64 *tp)
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{
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ktime_get_raw_ts64(tp);
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timens_add_monotonic(tp);
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return 0;
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}
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|
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static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec64 *tp)
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{
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ktime_get_coarse_real_ts64(tp);
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return 0;
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}
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static int posix_get_monotonic_coarse(clockid_t which_clock,
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struct timespec64 *tp)
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{
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ktime_get_coarse_ts64(tp);
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timens_add_monotonic(tp);
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return 0;
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}
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static int posix_get_coarse_res(const clockid_t which_clock, struct timespec64 *tp)
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{
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*tp = ktime_to_timespec64(KTIME_LOW_RES);
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return 0;
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}
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static int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 *tp)
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{
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ktime_get_boottime_ts64(tp);
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timens_add_boottime(tp);
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return 0;
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}
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static ktime_t posix_get_boottime_ktime(const clockid_t which_clock)
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{
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return ktime_get_boottime();
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}
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static int posix_get_tai_timespec(clockid_t which_clock, struct timespec64 *tp)
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{
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ktime_get_clocktai_ts64(tp);
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return 0;
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}
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static ktime_t posix_get_tai_ktime(clockid_t which_clock)
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{
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return ktime_get_clocktai();
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}
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static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp)
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{
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tp->tv_sec = 0;
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tp->tv_nsec = hrtimer_resolution;
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return 0;
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}
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/*
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* Initialize everything, well, just everything in Posix clocks/timers ;)
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*/
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static __init int init_posix_timers(void)
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{
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posix_timers_cache = kmem_cache_create("posix_timers_cache",
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sizeof (struct k_itimer), 0, SLAB_PANIC,
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NULL);
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return 0;
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}
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__initcall(init_posix_timers);
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/*
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* The siginfo si_overrun field and the return value of timer_getoverrun(2)
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* are of type int. Clamp the overrun value to INT_MAX
|
*/
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static inline int timer_overrun_to_int(struct k_itimer *timr, int baseval)
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{
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s64 sum = timr->it_overrun_last + (s64)baseval;
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return sum > (s64)INT_MAX ? INT_MAX : (int)sum;
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}
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static void common_hrtimer_rearm(struct k_itimer *timr)
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{
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struct hrtimer *timer = &timr->it.real.timer;
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timr->it_overrun += hrtimer_forward(timer, timer->base->get_time(),
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timr->it_interval);
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hrtimer_restart(timer);
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}
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/*
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* This function is exported for use by the signal deliver code. It is
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* called just prior to the info block being released and passes that
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* block to us. It's function is to update the overrun entry AND to
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* restart the timer. It should only be called if the timer is to be
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* restarted (i.e. we have flagged this in the sys_private entry of the
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* info block).
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*
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* To protect against the timer going away while the interrupt is queued,
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* we require that the it_requeue_pending flag be set.
|
*/
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void posixtimer_rearm(struct kernel_siginfo *info)
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{
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struct k_itimer *timr;
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unsigned long flags;
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timr = lock_timer(info->si_tid, &flags);
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if (!timr)
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return;
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if (timr->it_interval && timr->it_requeue_pending == info->si_sys_private) {
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timr->kclock->timer_rearm(timr);
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timr->it_active = 1;
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timr->it_overrun_last = timr->it_overrun;
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timr->it_overrun = -1LL;
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++timr->it_requeue_pending;
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info->si_overrun = timer_overrun_to_int(timr, info->si_overrun);
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}
|
|
unlock_timer(timr, flags);
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}
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int posix_timer_event(struct k_itimer *timr, int si_private)
|
{
|
enum pid_type type;
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int ret = -1;
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/*
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* FIXME: if ->sigq is queued we can race with
|
* dequeue_signal()->posixtimer_rearm().
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*
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* If dequeue_signal() sees the "right" value of
|
* si_sys_private it calls posixtimer_rearm().
|
* We re-queue ->sigq and drop ->it_lock().
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* posixtimer_rearm() locks the timer
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* and re-schedules it while ->sigq is pending.
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* Not really bad, but not that we want.
|
*/
|
timr->sigq->info.si_sys_private = si_private;
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type = !(timr->it_sigev_notify & SIGEV_THREAD_ID) ? PIDTYPE_TGID : PIDTYPE_PID;
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ret = send_sigqueue(timr->sigq, timr->it_pid, type);
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/* If we failed to send the signal the timer stops. */
|
return ret > 0;
|
}
|
|
/*
|
* This function gets called when a POSIX.1b interval timer expires. It
|
* is used as a callback from the kernel internal timer. The
|
* run_timer_list code ALWAYS calls with interrupts on.
|
|
* This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers.
|
*/
|
static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
|
{
|
struct k_itimer *timr;
|
unsigned long flags;
|
int si_private = 0;
|
enum hrtimer_restart ret = HRTIMER_NORESTART;
|
|
timr = container_of(timer, struct k_itimer, it.real.timer);
|
spin_lock_irqsave(&timr->it_lock, flags);
|
|
timr->it_active = 0;
|
if (timr->it_interval != 0)
|
si_private = ++timr->it_requeue_pending;
|
|
if (posix_timer_event(timr, si_private)) {
|
/*
|
* signal was not sent because of sig_ignor
|
* we will not get a call back to restart it AND
|
* it should be restarted.
|
*/
|
if (timr->it_interval != 0) {
|
ktime_t now = hrtimer_cb_get_time(timer);
|
|
/*
|
* FIXME: What we really want, is to stop this
|
* timer completely and restart it in case the
|
* SIG_IGN is removed. This is a non trivial
|
* change which involves sighand locking
|
* (sigh !), which we don't want to do late in
|
* the release cycle.
|
*
|
* For now we just let timers with an interval
|
* less than a jiffie expire every jiffie to
|
* avoid softirq starvation in case of SIG_IGN
|
* and a very small interval, which would put
|
* the timer right back on the softirq pending
|
* list. By moving now ahead of time we trick
|
* hrtimer_forward() to expire the timer
|
* later, while we still maintain the overrun
|
* accuracy, but have some inconsistency in
|
* the timer_gettime() case. This is at least
|
* better than a starved softirq. A more
|
* complex fix which solves also another related
|
* inconsistency is already in the pipeline.
|
*/
|
#ifdef CONFIG_HIGH_RES_TIMERS
|
{
|
ktime_t kj = NSEC_PER_SEC / HZ;
|
|
if (timr->it_interval < kj)
|
now = ktime_add(now, kj);
|
}
|
#endif
|
timr->it_overrun += hrtimer_forward(timer, now,
|
timr->it_interval);
|
ret = HRTIMER_RESTART;
|
++timr->it_requeue_pending;
|
timr->it_active = 1;
|
}
|
}
|
|
unlock_timer(timr, flags);
|
return ret;
|
}
|
|
static struct pid *good_sigevent(sigevent_t * event)
|
{
|
struct pid *pid = task_tgid(current);
|
struct task_struct *rtn;
|
|
switch (event->sigev_notify) {
|
case SIGEV_SIGNAL | SIGEV_THREAD_ID:
|
pid = find_vpid(event->sigev_notify_thread_id);
|
rtn = pid_task(pid, PIDTYPE_PID);
|
if (!rtn || !same_thread_group(rtn, current))
|
return NULL;
|
fallthrough;
|
case SIGEV_SIGNAL:
|
case SIGEV_THREAD:
|
if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX)
|
return NULL;
|
fallthrough;
|
case SIGEV_NONE:
|
return pid;
|
default:
|
return NULL;
|
}
|
}
|
|
static struct k_itimer * alloc_posix_timer(void)
|
{
|
struct k_itimer *tmr;
|
tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL);
|
if (!tmr)
|
return tmr;
|
if (unlikely(!(tmr->sigq = sigqueue_alloc()))) {
|
kmem_cache_free(posix_timers_cache, tmr);
|
return NULL;
|
}
|
clear_siginfo(&tmr->sigq->info);
|
return tmr;
|
}
|
|
static void k_itimer_rcu_free(struct rcu_head *head)
|
{
|
struct k_itimer *tmr = container_of(head, struct k_itimer, rcu);
|
|
kmem_cache_free(posix_timers_cache, tmr);
|
}
|
|
#define IT_ID_SET 1
|
#define IT_ID_NOT_SET 0
|
static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
|
{
|
if (it_id_set) {
|
unsigned long flags;
|
spin_lock_irqsave(&hash_lock, flags);
|
hlist_del_rcu(&tmr->t_hash);
|
spin_unlock_irqrestore(&hash_lock, flags);
|
}
|
put_pid(tmr->it_pid);
|
sigqueue_free(tmr->sigq);
|
call_rcu(&tmr->rcu, k_itimer_rcu_free);
|
}
|
|
static int common_timer_create(struct k_itimer *new_timer)
|
{
|
hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
|
return 0;
|
}
|
|
/* Create a POSIX.1b interval timer. */
|
static int do_timer_create(clockid_t which_clock, struct sigevent *event,
|
timer_t __user *created_timer_id)
|
{
|
const struct k_clock *kc = clockid_to_kclock(which_clock);
|
struct k_itimer *new_timer;
|
int error, new_timer_id;
|
int it_id_set = IT_ID_NOT_SET;
|
|
if (!kc)
|
return -EINVAL;
|
if (!kc->timer_create)
|
return -EOPNOTSUPP;
|
|
new_timer = alloc_posix_timer();
|
if (unlikely(!new_timer))
|
return -EAGAIN;
|
|
spin_lock_init(&new_timer->it_lock);
|
new_timer_id = posix_timer_add(new_timer);
|
if (new_timer_id < 0) {
|
error = new_timer_id;
|
goto out;
|
}
|
|
it_id_set = IT_ID_SET;
|
new_timer->it_id = (timer_t) new_timer_id;
|
new_timer->it_clock = which_clock;
|
new_timer->kclock = kc;
|
new_timer->it_overrun = -1LL;
|
|
if (event) {
|
rcu_read_lock();
|
new_timer->it_pid = get_pid(good_sigevent(event));
|
rcu_read_unlock();
|
if (!new_timer->it_pid) {
|
error = -EINVAL;
|
goto out;
|
}
|
new_timer->it_sigev_notify = event->sigev_notify;
|
new_timer->sigq->info.si_signo = event->sigev_signo;
|
new_timer->sigq->info.si_value = event->sigev_value;
|
} else {
|
new_timer->it_sigev_notify = SIGEV_SIGNAL;
|
new_timer->sigq->info.si_signo = SIGALRM;
|
memset(&new_timer->sigq->info.si_value, 0, sizeof(sigval_t));
|
new_timer->sigq->info.si_value.sival_int = new_timer->it_id;
|
new_timer->it_pid = get_pid(task_tgid(current));
|
}
|
|
new_timer->sigq->info.si_tid = new_timer->it_id;
|
new_timer->sigq->info.si_code = SI_TIMER;
|
|
if (copy_to_user(created_timer_id,
|
&new_timer_id, sizeof (new_timer_id))) {
|
error = -EFAULT;
|
goto out;
|
}
|
|
error = kc->timer_create(new_timer);
|
if (error)
|
goto out;
|
|
spin_lock_irq(¤t->sighand->siglock);
|
new_timer->it_signal = current->signal;
|
list_add(&new_timer->list, ¤t->signal->posix_timers);
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
return 0;
|
/*
|
* In the case of the timer belonging to another task, after
|
* the task is unlocked, the timer is owned by the other task
|
* and may cease to exist at any time. Don't use or modify
|
* new_timer after the unlock call.
|
*/
|
out:
|
release_posix_timer(new_timer, it_id_set);
|
return error;
|
}
|
|
SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
|
struct sigevent __user *, timer_event_spec,
|
timer_t __user *, created_timer_id)
|
{
|
if (timer_event_spec) {
|
sigevent_t event;
|
|
if (copy_from_user(&event, timer_event_spec, sizeof (event)))
|
return -EFAULT;
|
return do_timer_create(which_clock, &event, created_timer_id);
|
}
|
return do_timer_create(which_clock, NULL, created_timer_id);
|
}
|
|
#ifdef CONFIG_COMPAT
|
COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
|
struct compat_sigevent __user *, timer_event_spec,
|
timer_t __user *, created_timer_id)
|
{
|
if (timer_event_spec) {
|
sigevent_t event;
|
|
if (get_compat_sigevent(&event, timer_event_spec))
|
return -EFAULT;
|
return do_timer_create(which_clock, &event, created_timer_id);
|
}
|
return do_timer_create(which_clock, NULL, created_timer_id);
|
}
|
#endif
|
|
/*
|
* Locking issues: We need to protect the result of the id look up until
|
* we get the timer locked down so it is not deleted under us. The
|
* removal is done under the idr spinlock so we use that here to bridge
|
* the find to the timer lock. To avoid a dead lock, the timer id MUST
|
* be release with out holding the timer lock.
|
*/
|
static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags)
|
{
|
struct k_itimer *timr;
|
|
/*
|
* timer_t could be any type >= int and we want to make sure any
|
* @timer_id outside positive int range fails lookup.
|
*/
|
if ((unsigned long long)timer_id > INT_MAX)
|
return NULL;
|
|
rcu_read_lock();
|
timr = posix_timer_by_id(timer_id);
|
if (timr) {
|
spin_lock_irqsave(&timr->it_lock, *flags);
|
if (timr->it_signal == current->signal) {
|
rcu_read_unlock();
|
return timr;
|
}
|
spin_unlock_irqrestore(&timr->it_lock, *flags);
|
}
|
rcu_read_unlock();
|
|
return NULL;
|
}
|
|
static ktime_t common_hrtimer_remaining(struct k_itimer *timr, ktime_t now)
|
{
|
struct hrtimer *timer = &timr->it.real.timer;
|
|
return __hrtimer_expires_remaining_adjusted(timer, now);
|
}
|
|
static s64 common_hrtimer_forward(struct k_itimer *timr, ktime_t now)
|
{
|
struct hrtimer *timer = &timr->it.real.timer;
|
|
return hrtimer_forward(timer, now, timr->it_interval);
|
}
|
|
/*
|
* Get the time remaining on a POSIX.1b interval timer. This function
|
* is ALWAYS called with spin_lock_irq on the timer, thus it must not
|
* mess with irq.
|
*
|
* We have a couple of messes to clean up here. First there is the case
|
* of a timer that has a requeue pending. These timers should appear to
|
* be in the timer list with an expiry as if we were to requeue them
|
* now.
|
*
|
* The second issue is the SIGEV_NONE timer which may be active but is
|
* not really ever put in the timer list (to save system resources).
|
* This timer may be expired, and if so, we will do it here. Otherwise
|
* it is the same as a requeue pending timer WRT to what we should
|
* report.
|
*/
|
void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting)
|
{
|
const struct k_clock *kc = timr->kclock;
|
ktime_t now, remaining, iv;
|
bool sig_none;
|
|
sig_none = timr->it_sigev_notify == SIGEV_NONE;
|
iv = timr->it_interval;
|
|
/* interval timer ? */
|
if (iv) {
|
cur_setting->it_interval = ktime_to_timespec64(iv);
|
} else if (!timr->it_active) {
|
/*
|
* SIGEV_NONE oneshot timers are never queued. Check them
|
* below.
|
*/
|
if (!sig_none)
|
return;
|
}
|
|
now = kc->clock_get_ktime(timr->it_clock);
|
|
/*
|
* When a requeue is pending or this is a SIGEV_NONE timer move the
|
* expiry time forward by intervals, so expiry is > now.
|
*/
|
if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none))
|
timr->it_overrun += kc->timer_forward(timr, now);
|
|
remaining = kc->timer_remaining(timr, now);
|
/* Return 0 only, when the timer is expired and not pending */
|
if (remaining <= 0) {
|
/*
|
* A single shot SIGEV_NONE timer must return 0, when
|
* it is expired !
|
*/
|
if (!sig_none)
|
cur_setting->it_value.tv_nsec = 1;
|
} else {
|
cur_setting->it_value = ktime_to_timespec64(remaining);
|
}
|
}
|
|
/* Get the time remaining on a POSIX.1b interval timer. */
|
static int do_timer_gettime(timer_t timer_id, struct itimerspec64 *setting)
|
{
|
struct k_itimer *timr;
|
const struct k_clock *kc;
|
unsigned long flags;
|
int ret = 0;
|
|
timr = lock_timer(timer_id, &flags);
|
if (!timr)
|
return -EINVAL;
|
|
memset(setting, 0, sizeof(*setting));
|
kc = timr->kclock;
|
if (WARN_ON_ONCE(!kc || !kc->timer_get))
|
ret = -EINVAL;
|
else
|
kc->timer_get(timr, setting);
|
|
unlock_timer(timr, flags);
|
return ret;
|
}
|
|
/* Get the time remaining on a POSIX.1b interval timer. */
|
SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
|
struct __kernel_itimerspec __user *, setting)
|
{
|
struct itimerspec64 cur_setting;
|
|
int ret = do_timer_gettime(timer_id, &cur_setting);
|
if (!ret) {
|
if (put_itimerspec64(&cur_setting, setting))
|
ret = -EFAULT;
|
}
|
return ret;
|
}
|
|
#ifdef CONFIG_COMPAT_32BIT_TIME
|
|
SYSCALL_DEFINE2(timer_gettime32, timer_t, timer_id,
|
struct old_itimerspec32 __user *, setting)
|
{
|
struct itimerspec64 cur_setting;
|
|
int ret = do_timer_gettime(timer_id, &cur_setting);
|
if (!ret) {
|
if (put_old_itimerspec32(&cur_setting, setting))
|
ret = -EFAULT;
|
}
|
return ret;
|
}
|
|
#endif
|
|
/*
|
* Get the number of overruns of a POSIX.1b interval timer. This is to
|
* be the overrun of the timer last delivered. At the same time we are
|
* accumulating overruns on the next timer. The overrun is frozen when
|
* the signal is delivered, either at the notify time (if the info block
|
* is not queued) or at the actual delivery time (as we are informed by
|
* the call back to posixtimer_rearm(). So all we need to do is
|
* to pick up the frozen overrun.
|
*/
|
SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id)
|
{
|
struct k_itimer *timr;
|
int overrun;
|
unsigned long flags;
|
|
timr = lock_timer(timer_id, &flags);
|
if (!timr)
|
return -EINVAL;
|
|
overrun = timer_overrun_to_int(timr, 0);
|
unlock_timer(timr, flags);
|
|
return overrun;
|
}
|
|
static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires,
|
bool absolute, bool sigev_none)
|
{
|
struct hrtimer *timer = &timr->it.real.timer;
|
enum hrtimer_mode mode;
|
|
mode = absolute ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL;
|
/*
|
* Posix magic: Relative CLOCK_REALTIME timers are not affected by
|
* clock modifications, so they become CLOCK_MONOTONIC based under the
|
* hood. See hrtimer_init(). Update timr->kclock, so the generic
|
* functions which use timr->kclock->clock_get_*() work.
|
*
|
* Note: it_clock stays unmodified, because the next timer_set() might
|
* use ABSTIME, so it needs to switch back.
|
*/
|
if (timr->it_clock == CLOCK_REALTIME)
|
timr->kclock = absolute ? &clock_realtime : &clock_monotonic;
|
|
hrtimer_init(&timr->it.real.timer, timr->it_clock, mode);
|
timr->it.real.timer.function = posix_timer_fn;
|
|
if (!absolute)
|
expires = ktime_add_safe(expires, timer->base->get_time());
|
hrtimer_set_expires(timer, expires);
|
|
if (!sigev_none)
|
hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
|
}
|
|
static int common_hrtimer_try_to_cancel(struct k_itimer *timr)
|
{
|
return hrtimer_try_to_cancel(&timr->it.real.timer);
|
}
|
|
static void common_timer_wait_running(struct k_itimer *timer)
|
{
|
hrtimer_cancel_wait_running(&timer->it.real.timer);
|
}
|
|
/*
|
* On PREEMPT_RT this prevent priority inversion against softirq kthread in
|
* case it gets preempted while executing a timer callback. See comments in
|
* hrtimer_cancel_wait_running. For PREEMPT_RT=n this just results in a
|
* cpu_relax().
|
*/
|
static struct k_itimer *timer_wait_running(struct k_itimer *timer,
|
unsigned long *flags)
|
{
|
const struct k_clock *kc = READ_ONCE(timer->kclock);
|
timer_t timer_id = READ_ONCE(timer->it_id);
|
|
/* Prevent kfree(timer) after dropping the lock */
|
rcu_read_lock();
|
unlock_timer(timer, *flags);
|
|
if (!WARN_ON_ONCE(!kc->timer_wait_running))
|
kc->timer_wait_running(timer);
|
|
rcu_read_unlock();
|
/* Relock the timer. It might be not longer hashed. */
|
return lock_timer(timer_id, flags);
|
}
|
|
/* Set a POSIX.1b interval timer. */
|
int common_timer_set(struct k_itimer *timr, int flags,
|
struct itimerspec64 *new_setting,
|
struct itimerspec64 *old_setting)
|
{
|
const struct k_clock *kc = timr->kclock;
|
bool sigev_none;
|
ktime_t expires;
|
|
if (old_setting)
|
common_timer_get(timr, old_setting);
|
|
/* Prevent rearming by clearing the interval */
|
timr->it_interval = 0;
|
/*
|
* Careful here. On SMP systems the timer expiry function could be
|
* active and spinning on timr->it_lock.
|
*/
|
if (kc->timer_try_to_cancel(timr) < 0)
|
return TIMER_RETRY;
|
|
timr->it_active = 0;
|
timr->it_requeue_pending = (timr->it_requeue_pending + 2) &
|
~REQUEUE_PENDING;
|
timr->it_overrun_last = 0;
|
|
/* Switch off the timer when it_value is zero */
|
if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec)
|
return 0;
|
|
timr->it_interval = timespec64_to_ktime(new_setting->it_interval);
|
expires = timespec64_to_ktime(new_setting->it_value);
|
if (flags & TIMER_ABSTIME)
|
expires = timens_ktime_to_host(timr->it_clock, expires);
|
sigev_none = timr->it_sigev_notify == SIGEV_NONE;
|
|
kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none);
|
timr->it_active = !sigev_none;
|
return 0;
|
}
|
|
static int do_timer_settime(timer_t timer_id, int tmr_flags,
|
struct itimerspec64 *new_spec64,
|
struct itimerspec64 *old_spec64)
|
{
|
const struct k_clock *kc;
|
struct k_itimer *timr;
|
unsigned long flags;
|
int error = 0;
|
|
if (!timespec64_valid(&new_spec64->it_interval) ||
|
!timespec64_valid(&new_spec64->it_value))
|
return -EINVAL;
|
|
if (old_spec64)
|
memset(old_spec64, 0, sizeof(*old_spec64));
|
|
timr = lock_timer(timer_id, &flags);
|
retry:
|
if (!timr)
|
return -EINVAL;
|
|
kc = timr->kclock;
|
if (WARN_ON_ONCE(!kc || !kc->timer_set))
|
error = -EINVAL;
|
else
|
error = kc->timer_set(timr, tmr_flags, new_spec64, old_spec64);
|
|
if (error == TIMER_RETRY) {
|
// We already got the old time...
|
old_spec64 = NULL;
|
/* Unlocks and relocks the timer if it still exists */
|
timr = timer_wait_running(timr, &flags);
|
goto retry;
|
}
|
unlock_timer(timr, flags);
|
|
return error;
|
}
|
|
/* Set a POSIX.1b interval timer */
|
SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
|
const struct __kernel_itimerspec __user *, new_setting,
|
struct __kernel_itimerspec __user *, old_setting)
|
{
|
struct itimerspec64 new_spec, old_spec;
|
struct itimerspec64 *rtn = old_setting ? &old_spec : NULL;
|
int error = 0;
|
|
if (!new_setting)
|
return -EINVAL;
|
|
if (get_itimerspec64(&new_spec, new_setting))
|
return -EFAULT;
|
|
error = do_timer_settime(timer_id, flags, &new_spec, rtn);
|
if (!error && old_setting) {
|
if (put_itimerspec64(&old_spec, old_setting))
|
error = -EFAULT;
|
}
|
return error;
|
}
|
|
#ifdef CONFIG_COMPAT_32BIT_TIME
|
SYSCALL_DEFINE4(timer_settime32, timer_t, timer_id, int, flags,
|
struct old_itimerspec32 __user *, new,
|
struct old_itimerspec32 __user *, old)
|
{
|
struct itimerspec64 new_spec, old_spec;
|
struct itimerspec64 *rtn = old ? &old_spec : NULL;
|
int error = 0;
|
|
if (!new)
|
return -EINVAL;
|
if (get_old_itimerspec32(&new_spec, new))
|
return -EFAULT;
|
|
error = do_timer_settime(timer_id, flags, &new_spec, rtn);
|
if (!error && old) {
|
if (put_old_itimerspec32(&old_spec, old))
|
error = -EFAULT;
|
}
|
return error;
|
}
|
#endif
|
|
int common_timer_del(struct k_itimer *timer)
|
{
|
const struct k_clock *kc = timer->kclock;
|
|
timer->it_interval = 0;
|
if (kc->timer_try_to_cancel(timer) < 0)
|
return TIMER_RETRY;
|
timer->it_active = 0;
|
return 0;
|
}
|
|
static inline int timer_delete_hook(struct k_itimer *timer)
|
{
|
const struct k_clock *kc = timer->kclock;
|
|
if (WARN_ON_ONCE(!kc || !kc->timer_del))
|
return -EINVAL;
|
return kc->timer_del(timer);
|
}
|
|
/* Delete a POSIX.1b interval timer. */
|
SYSCALL_DEFINE1(timer_delete, timer_t, timer_id)
|
{
|
struct k_itimer *timer;
|
unsigned long flags;
|
|
timer = lock_timer(timer_id, &flags);
|
|
retry_delete:
|
if (!timer)
|
return -EINVAL;
|
|
if (unlikely(timer_delete_hook(timer) == TIMER_RETRY)) {
|
/* Unlocks and relocks the timer if it still exists */
|
timer = timer_wait_running(timer, &flags);
|
goto retry_delete;
|
}
|
|
spin_lock(¤t->sighand->siglock);
|
list_del(&timer->list);
|
spin_unlock(¤t->sighand->siglock);
|
/*
|
* This keeps any tasks waiting on the spin lock from thinking
|
* they got something (see the lock code above).
|
*/
|
timer->it_signal = NULL;
|
|
unlock_timer(timer, flags);
|
release_posix_timer(timer, IT_ID_SET);
|
return 0;
|
}
|
|
/*
|
* return timer owned by the process, used by exit_itimers
|
*/
|
static void itimer_delete(struct k_itimer *timer)
|
{
|
retry_delete:
|
spin_lock_irq(&timer->it_lock);
|
|
if (timer_delete_hook(timer) == TIMER_RETRY) {
|
spin_unlock_irq(&timer->it_lock);
|
goto retry_delete;
|
}
|
list_del(&timer->list);
|
|
spin_unlock_irq(&timer->it_lock);
|
release_posix_timer(timer, IT_ID_SET);
|
}
|
|
/*
|
* This is called by do_exit or de_thread, only when nobody else can
|
* modify the signal->posix_timers list. Yet we need sighand->siglock
|
* to prevent the race with /proc/pid/timers.
|
*/
|
void exit_itimers(struct task_struct *tsk)
|
{
|
struct list_head timers;
|
struct k_itimer *tmr;
|
|
if (list_empty(&tsk->signal->posix_timers))
|
return;
|
|
spin_lock_irq(&tsk->sighand->siglock);
|
list_replace_init(&tsk->signal->posix_timers, &timers);
|
spin_unlock_irq(&tsk->sighand->siglock);
|
|
while (!list_empty(&timers)) {
|
tmr = list_first_entry(&timers, struct k_itimer, list);
|
itimer_delete(tmr);
|
}
|
}
|
|
SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
|
const struct __kernel_timespec __user *, tp)
|
{
|
const struct k_clock *kc = clockid_to_kclock(which_clock);
|
struct timespec64 new_tp;
|
|
if (!kc || !kc->clock_set)
|
return -EINVAL;
|
|
if (get_timespec64(&new_tp, tp))
|
return -EFAULT;
|
|
return kc->clock_set(which_clock, &new_tp);
|
}
|
|
SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
|
struct __kernel_timespec __user *, tp)
|
{
|
const struct k_clock *kc = clockid_to_kclock(which_clock);
|
struct timespec64 kernel_tp;
|
int error;
|
|
if (!kc)
|
return -EINVAL;
|
|
error = kc->clock_get_timespec(which_clock, &kernel_tp);
|
|
if (!error && put_timespec64(&kernel_tp, tp))
|
error = -EFAULT;
|
|
return error;
|
}
|
|
int do_clock_adjtime(const clockid_t which_clock, struct __kernel_timex * ktx)
|
{
|
const struct k_clock *kc = clockid_to_kclock(which_clock);
|
|
if (!kc)
|
return -EINVAL;
|
if (!kc->clock_adj)
|
return -EOPNOTSUPP;
|
|
return kc->clock_adj(which_clock, ktx);
|
}
|
|
SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
|
struct __kernel_timex __user *, utx)
|
{
|
struct __kernel_timex ktx;
|
int err;
|
|
if (copy_from_user(&ktx, utx, sizeof(ktx)))
|
return -EFAULT;
|
|
err = do_clock_adjtime(which_clock, &ktx);
|
|
if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx)))
|
return -EFAULT;
|
|
return err;
|
}
|
|
SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
|
struct __kernel_timespec __user *, tp)
|
{
|
const struct k_clock *kc = clockid_to_kclock(which_clock);
|
struct timespec64 rtn_tp;
|
int error;
|
|
if (!kc)
|
return -EINVAL;
|
|
error = kc->clock_getres(which_clock, &rtn_tp);
|
|
if (!error && tp && put_timespec64(&rtn_tp, tp))
|
error = -EFAULT;
|
|
return error;
|
}
|
|
#ifdef CONFIG_COMPAT_32BIT_TIME
|
|
SYSCALL_DEFINE2(clock_settime32, clockid_t, which_clock,
|
struct old_timespec32 __user *, tp)
|
{
|
const struct k_clock *kc = clockid_to_kclock(which_clock);
|
struct timespec64 ts;
|
|
if (!kc || !kc->clock_set)
|
return -EINVAL;
|
|
if (get_old_timespec32(&ts, tp))
|
return -EFAULT;
|
|
return kc->clock_set(which_clock, &ts);
|
}
|
|
SYSCALL_DEFINE2(clock_gettime32, clockid_t, which_clock,
|
struct old_timespec32 __user *, tp)
|
{
|
const struct k_clock *kc = clockid_to_kclock(which_clock);
|
struct timespec64 ts;
|
int err;
|
|
if (!kc)
|
return -EINVAL;
|
|
err = kc->clock_get_timespec(which_clock, &ts);
|
|
if (!err && put_old_timespec32(&ts, tp))
|
err = -EFAULT;
|
|
return err;
|
}
|
|
SYSCALL_DEFINE2(clock_adjtime32, clockid_t, which_clock,
|
struct old_timex32 __user *, utp)
|
{
|
struct __kernel_timex ktx;
|
int err;
|
|
err = get_old_timex32(&ktx, utp);
|
if (err)
|
return err;
|
|
err = do_clock_adjtime(which_clock, &ktx);
|
|
if (err >= 0 && put_old_timex32(utp, &ktx))
|
return -EFAULT;
|
|
return err;
|
}
|
|
SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock,
|
struct old_timespec32 __user *, tp)
|
{
|
const struct k_clock *kc = clockid_to_kclock(which_clock);
|
struct timespec64 ts;
|
int err;
|
|
if (!kc)
|
return -EINVAL;
|
|
err = kc->clock_getres(which_clock, &ts);
|
if (!err && tp && put_old_timespec32(&ts, tp))
|
return -EFAULT;
|
|
return err;
|
}
|
|
#endif
|
|
/*
|
* nanosleep for monotonic and realtime clocks
|
*/
|
static int common_nsleep(const clockid_t which_clock, int flags,
|
const struct timespec64 *rqtp)
|
{
|
ktime_t texp = timespec64_to_ktime(*rqtp);
|
|
return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ?
|
HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
|
which_clock);
|
}
|
|
static int common_nsleep_timens(const clockid_t which_clock, int flags,
|
const struct timespec64 *rqtp)
|
{
|
ktime_t texp = timespec64_to_ktime(*rqtp);
|
|
if (flags & TIMER_ABSTIME)
|
texp = timens_ktime_to_host(which_clock, texp);
|
|
return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ?
|
HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
|
which_clock);
|
}
|
|
SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
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const struct __kernel_timespec __user *, rqtp,
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struct __kernel_timespec __user *, rmtp)
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{
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const struct k_clock *kc = clockid_to_kclock(which_clock);
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struct timespec64 t;
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if (!kc)
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return -EINVAL;
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if (!kc->nsleep)
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return -EOPNOTSUPP;
|
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if (get_timespec64(&t, rqtp))
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return -EFAULT;
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if (!timespec64_valid(&t))
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return -EINVAL;
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if (flags & TIMER_ABSTIME)
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rmtp = NULL;
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current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
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current->restart_block.nanosleep.rmtp = rmtp;
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return kc->nsleep(which_clock, flags, &t);
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}
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#ifdef CONFIG_COMPAT_32BIT_TIME
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SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags,
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struct old_timespec32 __user *, rqtp,
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struct old_timespec32 __user *, rmtp)
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{
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const struct k_clock *kc = clockid_to_kclock(which_clock);
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struct timespec64 t;
|
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if (!kc)
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return -EINVAL;
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if (!kc->nsleep)
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return -EOPNOTSUPP;
|
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if (get_old_timespec32(&t, rqtp))
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return -EFAULT;
|
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if (!timespec64_valid(&t))
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return -EINVAL;
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if (flags & TIMER_ABSTIME)
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rmtp = NULL;
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current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
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current->restart_block.nanosleep.compat_rmtp = rmtp;
|
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return kc->nsleep(which_clock, flags, &t);
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}
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#endif
|
|
static const struct k_clock clock_realtime = {
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.clock_getres = posix_get_hrtimer_res,
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.clock_get_timespec = posix_get_realtime_timespec,
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.clock_get_ktime = posix_get_realtime_ktime,
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.clock_set = posix_clock_realtime_set,
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.clock_adj = posix_clock_realtime_adj,
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.nsleep = common_nsleep,
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.timer_create = common_timer_create,
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.timer_set = common_timer_set,
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.timer_get = common_timer_get,
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.timer_del = common_timer_del,
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.timer_rearm = common_hrtimer_rearm,
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.timer_forward = common_hrtimer_forward,
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.timer_remaining = common_hrtimer_remaining,
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.timer_try_to_cancel = common_hrtimer_try_to_cancel,
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.timer_wait_running = common_timer_wait_running,
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.timer_arm = common_hrtimer_arm,
|
};
|
|
static const struct k_clock clock_monotonic = {
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.clock_getres = posix_get_hrtimer_res,
|
.clock_get_timespec = posix_get_monotonic_timespec,
|
.clock_get_ktime = posix_get_monotonic_ktime,
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.nsleep = common_nsleep_timens,
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.timer_create = common_timer_create,
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.timer_set = common_timer_set,
|
.timer_get = common_timer_get,
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.timer_del = common_timer_del,
|
.timer_rearm = common_hrtimer_rearm,
|
.timer_forward = common_hrtimer_forward,
|
.timer_remaining = common_hrtimer_remaining,
|
.timer_try_to_cancel = common_hrtimer_try_to_cancel,
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.timer_wait_running = common_timer_wait_running,
|
.timer_arm = common_hrtimer_arm,
|
};
|
|
static const struct k_clock clock_monotonic_raw = {
|
.clock_getres = posix_get_hrtimer_res,
|
.clock_get_timespec = posix_get_monotonic_raw,
|
};
|
|
static const struct k_clock clock_realtime_coarse = {
|
.clock_getres = posix_get_coarse_res,
|
.clock_get_timespec = posix_get_realtime_coarse,
|
};
|
|
static const struct k_clock clock_monotonic_coarse = {
|
.clock_getres = posix_get_coarse_res,
|
.clock_get_timespec = posix_get_monotonic_coarse,
|
};
|
|
static const struct k_clock clock_tai = {
|
.clock_getres = posix_get_hrtimer_res,
|
.clock_get_ktime = posix_get_tai_ktime,
|
.clock_get_timespec = posix_get_tai_timespec,
|
.nsleep = common_nsleep,
|
.timer_create = common_timer_create,
|
.timer_set = common_timer_set,
|
.timer_get = common_timer_get,
|
.timer_del = common_timer_del,
|
.timer_rearm = common_hrtimer_rearm,
|
.timer_forward = common_hrtimer_forward,
|
.timer_remaining = common_hrtimer_remaining,
|
.timer_try_to_cancel = common_hrtimer_try_to_cancel,
|
.timer_wait_running = common_timer_wait_running,
|
.timer_arm = common_hrtimer_arm,
|
};
|
|
static const struct k_clock clock_boottime = {
|
.clock_getres = posix_get_hrtimer_res,
|
.clock_get_ktime = posix_get_boottime_ktime,
|
.clock_get_timespec = posix_get_boottime_timespec,
|
.nsleep = common_nsleep_timens,
|
.timer_create = common_timer_create,
|
.timer_set = common_timer_set,
|
.timer_get = common_timer_get,
|
.timer_del = common_timer_del,
|
.timer_rearm = common_hrtimer_rearm,
|
.timer_forward = common_hrtimer_forward,
|
.timer_remaining = common_hrtimer_remaining,
|
.timer_try_to_cancel = common_hrtimer_try_to_cancel,
|
.timer_wait_running = common_timer_wait_running,
|
.timer_arm = common_hrtimer_arm,
|
};
|
|
static const struct k_clock * const posix_clocks[] = {
|
[CLOCK_REALTIME] = &clock_realtime,
|
[CLOCK_MONOTONIC] = &clock_monotonic,
|
[CLOCK_PROCESS_CPUTIME_ID] = &clock_process,
|
[CLOCK_THREAD_CPUTIME_ID] = &clock_thread,
|
[CLOCK_MONOTONIC_RAW] = &clock_monotonic_raw,
|
[CLOCK_REALTIME_COARSE] = &clock_realtime_coarse,
|
[CLOCK_MONOTONIC_COARSE] = &clock_monotonic_coarse,
|
[CLOCK_BOOTTIME] = &clock_boottime,
|
[CLOCK_REALTIME_ALARM] = &alarm_clock,
|
[CLOCK_BOOTTIME_ALARM] = &alarm_clock,
|
[CLOCK_TAI] = &clock_tai,
|
};
|
|
static const struct k_clock *clockid_to_kclock(const clockid_t id)
|
{
|
clockid_t idx = id;
|
|
if (id < 0) {
|
return (id & CLOCKFD_MASK) == CLOCKFD ?
|
&clock_posix_dynamic : &clock_posix_cpu;
|
}
|
|
if (id >= ARRAY_SIZE(posix_clocks))
|
return NULL;
|
|
return posix_clocks[array_index_nospec(idx, ARRAY_SIZE(posix_clocks))];
|
}
|
