Similarly to allocation, do it from an inline function. This allows tests to only use the headers for allocation/free of timer. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
665 lines
18 KiB
C
665 lines
18 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/main-loop.h"
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#include "qemu/timer.h"
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#include "sysemu/replay.h"
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#include "sysemu/sysemu.h"
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#ifdef CONFIG_POSIX
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#include <pthread.h>
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#endif
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#ifdef CONFIG_PPOLL
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#include <poll.h>
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#endif
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#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
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#include <sys/prctl.h>
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#endif
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/***********************************************************/
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/* timers */
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typedef struct QEMUClock {
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/* We rely on BQL to protect the timerlists */
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QLIST_HEAD(, QEMUTimerList) timerlists;
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NotifierList reset_notifiers;
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int64_t last;
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QEMUClockType type;
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bool enabled;
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} QEMUClock;
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QEMUTimerListGroup main_loop_tlg;
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static QEMUClock qemu_clocks[QEMU_CLOCK_MAX];
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/* A QEMUTimerList is a list of timers attached to a clock. More
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* than one QEMUTimerList can be attached to each clock, for instance
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* used by different AioContexts / threads. Each clock also has
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* a list of the QEMUTimerLists associated with it, in order that
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* reenabling the clock can call all the notifiers.
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*/
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struct QEMUTimerList {
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QEMUClock *clock;
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QemuMutex active_timers_lock;
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QEMUTimer *active_timers;
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QLIST_ENTRY(QEMUTimerList) list;
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QEMUTimerListNotifyCB *notify_cb;
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void *notify_opaque;
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/* lightweight method to mark the end of timerlist's running */
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QemuEvent timers_done_ev;
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};
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/**
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* qemu_clock_ptr:
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* @type: type of clock
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*
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* Translate a clock type into a pointer to QEMUClock object.
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*
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* Returns: a pointer to the QEMUClock object
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*/
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static inline QEMUClock *qemu_clock_ptr(QEMUClockType type)
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{
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return &qemu_clocks[type];
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}
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static bool timer_expired_ns(QEMUTimer *timer_head, int64_t current_time)
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{
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return timer_head && (timer_head->expire_time <= current_time);
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}
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QEMUTimerList *timerlist_new(QEMUClockType type,
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QEMUTimerListNotifyCB *cb,
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void *opaque)
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{
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QEMUTimerList *timer_list;
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QEMUClock *clock = qemu_clock_ptr(type);
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timer_list = g_malloc0(sizeof(QEMUTimerList));
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qemu_event_init(&timer_list->timers_done_ev, true);
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timer_list->clock = clock;
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timer_list->notify_cb = cb;
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timer_list->notify_opaque = opaque;
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qemu_mutex_init(&timer_list->active_timers_lock);
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QLIST_INSERT_HEAD(&clock->timerlists, timer_list, list);
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return timer_list;
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}
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void timerlist_free(QEMUTimerList *timer_list)
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{
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assert(!timerlist_has_timers(timer_list));
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if (timer_list->clock) {
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QLIST_REMOVE(timer_list, list);
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}
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qemu_mutex_destroy(&timer_list->active_timers_lock);
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g_free(timer_list);
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}
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static void qemu_clock_init(QEMUClockType type)
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{
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QEMUClock *clock = qemu_clock_ptr(type);
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/* Assert that the clock of type TYPE has not been initialized yet. */
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assert(main_loop_tlg.tl[type] == NULL);
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clock->type = type;
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clock->enabled = (type == QEMU_CLOCK_VIRTUAL ? false : true);
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clock->last = INT64_MIN;
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QLIST_INIT(&clock->timerlists);
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notifier_list_init(&clock->reset_notifiers);
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main_loop_tlg.tl[type] = timerlist_new(type, NULL, NULL);
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}
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bool qemu_clock_use_for_deadline(QEMUClockType type)
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{
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return !(use_icount && (type == QEMU_CLOCK_VIRTUAL));
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}
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void qemu_clock_notify(QEMUClockType type)
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{
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QEMUTimerList *timer_list;
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QEMUClock *clock = qemu_clock_ptr(type);
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QLIST_FOREACH(timer_list, &clock->timerlists, list) {
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timerlist_notify(timer_list);
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}
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}
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/* Disabling the clock will wait for related timerlists to stop
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* executing qemu_run_timers. Thus, this functions should not
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* be used from the callback of a timer that is based on @clock.
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* Doing so would cause a deadlock.
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*
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* Caller should hold BQL.
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*/
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void qemu_clock_enable(QEMUClockType type, bool enabled)
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{
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QEMUClock *clock = qemu_clock_ptr(type);
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QEMUTimerList *tl;
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bool old = clock->enabled;
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clock->enabled = enabled;
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if (enabled && !old) {
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qemu_clock_notify(type);
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} else if (!enabled && old) {
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QLIST_FOREACH(tl, &clock->timerlists, list) {
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qemu_event_wait(&tl->timers_done_ev);
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}
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}
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}
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bool timerlist_has_timers(QEMUTimerList *timer_list)
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{
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return !!atomic_read(&timer_list->active_timers);
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}
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bool qemu_clock_has_timers(QEMUClockType type)
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{
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return timerlist_has_timers(
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main_loop_tlg.tl[type]);
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}
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bool timerlist_expired(QEMUTimerList *timer_list)
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{
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int64_t expire_time;
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if (!atomic_read(&timer_list->active_timers)) {
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return false;
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}
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qemu_mutex_lock(&timer_list->active_timers_lock);
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if (!timer_list->active_timers) {
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qemu_mutex_unlock(&timer_list->active_timers_lock);
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return false;
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}
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expire_time = timer_list->active_timers->expire_time;
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qemu_mutex_unlock(&timer_list->active_timers_lock);
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return expire_time < qemu_clock_get_ns(timer_list->clock->type);
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}
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bool qemu_clock_expired(QEMUClockType type)
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{
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return timerlist_expired(
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main_loop_tlg.tl[type]);
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}
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/*
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* As above, but return -1 for no deadline, and do not cap to 2^32
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* as we know the result is always positive.
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*/
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int64_t timerlist_deadline_ns(QEMUTimerList *timer_list)
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{
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int64_t delta;
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int64_t expire_time;
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if (!atomic_read(&timer_list->active_timers)) {
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return -1;
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}
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if (!timer_list->clock->enabled) {
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return -1;
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}
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/* The active timers list may be modified before the caller uses our return
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* value but ->notify_cb() is called when the deadline changes. Therefore
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* the caller should notice the change and there is no race condition.
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*/
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qemu_mutex_lock(&timer_list->active_timers_lock);
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if (!timer_list->active_timers) {
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qemu_mutex_unlock(&timer_list->active_timers_lock);
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return -1;
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}
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expire_time = timer_list->active_timers->expire_time;
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qemu_mutex_unlock(&timer_list->active_timers_lock);
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delta = expire_time - qemu_clock_get_ns(timer_list->clock->type);
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if (delta <= 0) {
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return 0;
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}
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return delta;
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}
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/* Calculate the soonest deadline across all timerlists attached
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* to the clock. This is used for the icount timeout so we
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* ignore whether or not the clock should be used in deadline
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* calculations.
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*/
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int64_t qemu_clock_deadline_ns_all(QEMUClockType type)
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{
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int64_t deadline = -1;
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QEMUTimerList *timer_list;
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QEMUClock *clock = qemu_clock_ptr(type);
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QLIST_FOREACH(timer_list, &clock->timerlists, list) {
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deadline = qemu_soonest_timeout(deadline,
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timerlist_deadline_ns(timer_list));
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}
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return deadline;
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}
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QEMUClockType timerlist_get_clock(QEMUTimerList *timer_list)
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{
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return timer_list->clock->type;
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}
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QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClockType type)
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{
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return main_loop_tlg.tl[type];
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}
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void timerlist_notify(QEMUTimerList *timer_list)
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{
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if (timer_list->notify_cb) {
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timer_list->notify_cb(timer_list->notify_opaque);
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} else {
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qemu_notify_event();
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}
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}
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/* Transition function to convert a nanosecond timeout to ms
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* This is used where a system does not support ppoll
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*/
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int qemu_timeout_ns_to_ms(int64_t ns)
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{
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int64_t ms;
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if (ns < 0) {
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return -1;
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}
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if (!ns) {
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return 0;
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}
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/* Always round up, because it's better to wait too long than to wait too
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* little and effectively busy-wait
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*/
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ms = DIV_ROUND_UP(ns, SCALE_MS);
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/* To avoid overflow problems, limit this to 2^31, i.e. approx 25 days */
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if (ms > (int64_t) INT32_MAX) {
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ms = INT32_MAX;
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}
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return (int) ms;
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}
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/* qemu implementation of g_poll which uses a nanosecond timeout but is
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* otherwise identical to g_poll
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*/
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int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout)
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{
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#ifdef CONFIG_PPOLL
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if (timeout < 0) {
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return ppoll((struct pollfd *)fds, nfds, NULL, NULL);
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} else {
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struct timespec ts;
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int64_t tvsec = timeout / 1000000000LL;
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/* Avoid possibly overflowing and specifying a negative number of
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* seconds, which would turn a very long timeout into a busy-wait.
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*/
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if (tvsec > (int64_t)INT32_MAX) {
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tvsec = INT32_MAX;
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}
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ts.tv_sec = tvsec;
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ts.tv_nsec = timeout % 1000000000LL;
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return ppoll((struct pollfd *)fds, nfds, &ts, NULL);
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}
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#else
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return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout));
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#endif
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}
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void timer_init_tl(QEMUTimer *ts,
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QEMUTimerList *timer_list, int scale,
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QEMUTimerCB *cb, void *opaque)
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{
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ts->timer_list = timer_list;
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ts->cb = cb;
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ts->opaque = opaque;
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ts->scale = scale;
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ts->expire_time = -1;
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}
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void timer_deinit(QEMUTimer *ts)
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{
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assert(ts->expire_time == -1);
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ts->timer_list = NULL;
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}
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static void timer_del_locked(QEMUTimerList *timer_list, QEMUTimer *ts)
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{
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QEMUTimer **pt, *t;
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ts->expire_time = -1;
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pt = &timer_list->active_timers;
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for(;;) {
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t = *pt;
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if (!t)
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break;
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if (t == ts) {
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atomic_set(pt, t->next);
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break;
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}
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pt = &t->next;
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}
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}
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static bool timer_mod_ns_locked(QEMUTimerList *timer_list,
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QEMUTimer *ts, int64_t expire_time)
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{
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QEMUTimer **pt, *t;
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/* add the timer in the sorted list */
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pt = &timer_list->active_timers;
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for (;;) {
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t = *pt;
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if (!timer_expired_ns(t, expire_time)) {
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break;
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}
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pt = &t->next;
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}
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ts->expire_time = MAX(expire_time, 0);
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ts->next = *pt;
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atomic_set(pt, ts);
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return pt == &timer_list->active_timers;
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}
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static void timerlist_rearm(QEMUTimerList *timer_list)
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{
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/* Interrupt execution to force deadline recalculation. */
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if (timer_list->clock->type == QEMU_CLOCK_VIRTUAL) {
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qemu_start_warp_timer();
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}
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timerlist_notify(timer_list);
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}
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/* stop a timer, but do not dealloc it */
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void timer_del(QEMUTimer *ts)
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{
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QEMUTimerList *timer_list = ts->timer_list;
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if (timer_list) {
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qemu_mutex_lock(&timer_list->active_timers_lock);
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timer_del_locked(timer_list, ts);
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qemu_mutex_unlock(&timer_list->active_timers_lock);
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}
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}
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/* modify the current timer so that it will be fired when current_time
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>= expire_time. The corresponding callback will be called. */
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void timer_mod_ns(QEMUTimer *ts, int64_t expire_time)
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{
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QEMUTimerList *timer_list = ts->timer_list;
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bool rearm;
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qemu_mutex_lock(&timer_list->active_timers_lock);
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timer_del_locked(timer_list, ts);
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rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
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qemu_mutex_unlock(&timer_list->active_timers_lock);
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if (rearm) {
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timerlist_rearm(timer_list);
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}
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}
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/* modify the current timer so that it will be fired when current_time
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>= expire_time or the current deadline, whichever comes earlier.
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The corresponding callback will be called. */
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void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time)
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{
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QEMUTimerList *timer_list = ts->timer_list;
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bool rearm;
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qemu_mutex_lock(&timer_list->active_timers_lock);
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if (ts->expire_time == -1 || ts->expire_time > expire_time) {
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if (ts->expire_time != -1) {
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timer_del_locked(timer_list, ts);
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}
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rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
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} else {
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rearm = false;
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}
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qemu_mutex_unlock(&timer_list->active_timers_lock);
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if (rearm) {
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timerlist_rearm(timer_list);
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}
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}
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void timer_mod(QEMUTimer *ts, int64_t expire_time)
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{
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timer_mod_ns(ts, expire_time * ts->scale);
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}
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void timer_mod_anticipate(QEMUTimer *ts, int64_t expire_time)
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{
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timer_mod_anticipate_ns(ts, expire_time * ts->scale);
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}
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bool timer_pending(QEMUTimer *ts)
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{
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return ts->expire_time >= 0;
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}
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bool timer_expired(QEMUTimer *timer_head, int64_t current_time)
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{
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return timer_expired_ns(timer_head, current_time * timer_head->scale);
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}
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bool timerlist_run_timers(QEMUTimerList *timer_list)
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{
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QEMUTimer *ts;
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int64_t current_time;
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bool progress = false;
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QEMUTimerCB *cb;
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void *opaque;
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if (!atomic_read(&timer_list->active_timers)) {
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return false;
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}
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qemu_event_reset(&timer_list->timers_done_ev);
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if (!timer_list->clock->enabled) {
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goto out;
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}
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switch (timer_list->clock->type) {
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case QEMU_CLOCK_REALTIME:
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break;
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default:
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case QEMU_CLOCK_VIRTUAL:
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if (!replay_checkpoint(CHECKPOINT_CLOCK_VIRTUAL)) {
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goto out;
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}
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break;
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case QEMU_CLOCK_HOST:
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if (!replay_checkpoint(CHECKPOINT_CLOCK_HOST)) {
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goto out;
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}
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break;
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case QEMU_CLOCK_VIRTUAL_RT:
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if (!replay_checkpoint(CHECKPOINT_CLOCK_VIRTUAL_RT)) {
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goto out;
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}
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break;
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}
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current_time = qemu_clock_get_ns(timer_list->clock->type);
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for(;;) {
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qemu_mutex_lock(&timer_list->active_timers_lock);
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ts = timer_list->active_timers;
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|
if (!timer_expired_ns(ts, current_time)) {
|
|
qemu_mutex_unlock(&timer_list->active_timers_lock);
|
|
break;
|
|
}
|
|
|
|
/* remove timer from the list before calling the callback */
|
|
timer_list->active_timers = ts->next;
|
|
ts->next = NULL;
|
|
ts->expire_time = -1;
|
|
cb = ts->cb;
|
|
opaque = ts->opaque;
|
|
qemu_mutex_unlock(&timer_list->active_timers_lock);
|
|
|
|
/* run the callback (the timer list can be modified) */
|
|
cb(opaque);
|
|
progress = true;
|
|
}
|
|
|
|
out:
|
|
qemu_event_set(&timer_list->timers_done_ev);
|
|
return progress;
|
|
}
|
|
|
|
bool qemu_clock_run_timers(QEMUClockType type)
|
|
{
|
|
return timerlist_run_timers(main_loop_tlg.tl[type]);
|
|
}
|
|
|
|
void timerlistgroup_init(QEMUTimerListGroup *tlg,
|
|
QEMUTimerListNotifyCB *cb, void *opaque)
|
|
{
|
|
QEMUClockType type;
|
|
for (type = 0; type < QEMU_CLOCK_MAX; type++) {
|
|
tlg->tl[type] = timerlist_new(type, cb, opaque);
|
|
}
|
|
}
|
|
|
|
void timerlistgroup_deinit(QEMUTimerListGroup *tlg)
|
|
{
|
|
QEMUClockType type;
|
|
for (type = 0; type < QEMU_CLOCK_MAX; type++) {
|
|
timerlist_free(tlg->tl[type]);
|
|
}
|
|
}
|
|
|
|
bool timerlistgroup_run_timers(QEMUTimerListGroup *tlg)
|
|
{
|
|
QEMUClockType type;
|
|
bool progress = false;
|
|
for (type = 0; type < QEMU_CLOCK_MAX; type++) {
|
|
progress |= timerlist_run_timers(tlg->tl[type]);
|
|
}
|
|
return progress;
|
|
}
|
|
|
|
int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup *tlg)
|
|
{
|
|
int64_t deadline = -1;
|
|
QEMUClockType type;
|
|
bool play = replay_mode == REPLAY_MODE_PLAY;
|
|
for (type = 0; type < QEMU_CLOCK_MAX; type++) {
|
|
if (qemu_clock_use_for_deadline(type)) {
|
|
if (!play || type == QEMU_CLOCK_REALTIME) {
|
|
deadline = qemu_soonest_timeout(deadline,
|
|
timerlist_deadline_ns(tlg->tl[type]));
|
|
} else {
|
|
/* Read clock from the replay file and
|
|
do not calculate the deadline, based on virtual clock. */
|
|
qemu_clock_get_ns(type);
|
|
}
|
|
}
|
|
}
|
|
return deadline;
|
|
}
|
|
|
|
int64_t qemu_clock_get_ns(QEMUClockType type)
|
|
{
|
|
int64_t now, last;
|
|
QEMUClock *clock = qemu_clock_ptr(type);
|
|
|
|
switch (type) {
|
|
case QEMU_CLOCK_REALTIME:
|
|
return get_clock();
|
|
default:
|
|
case QEMU_CLOCK_VIRTUAL:
|
|
if (use_icount) {
|
|
return cpu_get_icount();
|
|
} else {
|
|
return cpu_get_clock();
|
|
}
|
|
case QEMU_CLOCK_HOST:
|
|
now = REPLAY_CLOCK(REPLAY_CLOCK_HOST, get_clock_realtime());
|
|
last = clock->last;
|
|
clock->last = now;
|
|
if (now < last || now > (last + get_max_clock_jump())) {
|
|
notifier_list_notify(&clock->reset_notifiers, &now);
|
|
}
|
|
return now;
|
|
case QEMU_CLOCK_VIRTUAL_RT:
|
|
return REPLAY_CLOCK(REPLAY_CLOCK_VIRTUAL_RT, cpu_get_clock());
|
|
}
|
|
}
|
|
|
|
void qemu_clock_register_reset_notifier(QEMUClockType type,
|
|
Notifier *notifier)
|
|
{
|
|
QEMUClock *clock = qemu_clock_ptr(type);
|
|
notifier_list_add(&clock->reset_notifiers, notifier);
|
|
}
|
|
|
|
void qemu_clock_unregister_reset_notifier(QEMUClockType type,
|
|
Notifier *notifier)
|
|
{
|
|
notifier_remove(notifier);
|
|
}
|
|
|
|
void init_clocks(void)
|
|
{
|
|
QEMUClockType type;
|
|
for (type = 0; type < QEMU_CLOCK_MAX; type++) {
|
|
qemu_clock_init(type);
|
|
}
|
|
|
|
#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
|
|
prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0);
|
|
#endif
|
|
}
|
|
|
|
uint64_t timer_expire_time_ns(QEMUTimer *ts)
|
|
{
|
|
return timer_pending(ts) ? ts->expire_time : -1;
|
|
}
|
|
|
|
bool qemu_clock_run_all_timers(void)
|
|
{
|
|
bool progress = false;
|
|
QEMUClockType type;
|
|
|
|
for (type = 0; type < QEMU_CLOCK_MAX; type++) {
|
|
progress |= qemu_clock_run_timers(type);
|
|
}
|
|
|
|
return progress;
|
|
}
|