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https://github.com/qemu/qemu.git
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cca5de7389
The non-dynticks timer variations are broken, so they can be removed. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
852 lines
21 KiB
C
852 lines
21 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 "sysemu.h"
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#include "net.h"
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#include "monitor.h"
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#include "console.h"
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#include "hw/hw.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <time.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <signal.h>
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#ifdef __FreeBSD__
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#include <sys/param.h>
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#include <mmsystem.h>
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#endif
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#include "qemu-timer.h"
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/***********************************************************/
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/* timers */
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#define QEMU_CLOCK_REALTIME 0
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#define QEMU_CLOCK_VIRTUAL 1
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#define QEMU_CLOCK_HOST 2
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struct QEMUClock {
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int type;
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int enabled;
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QEMUTimer *active_timers;
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NotifierList reset_notifiers;
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int64_t last;
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};
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struct QEMUTimer {
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QEMUClock *clock;
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int64_t expire_time; /* in nanoseconds */
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int scale;
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QEMUTimerCB *cb;
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void *opaque;
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struct QEMUTimer *next;
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};
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struct qemu_alarm_timer {
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char const *name;
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int (*start)(struct qemu_alarm_timer *t);
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void (*stop)(struct qemu_alarm_timer *t);
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void (*rearm)(struct qemu_alarm_timer *t, int64_t nearest_delta_ns);
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#if defined(__linux__)
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int fd;
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timer_t timer;
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#elif defined(_WIN32)
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HANDLE timer;
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#endif
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char expired;
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char pending;
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};
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static struct qemu_alarm_timer *alarm_timer;
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static bool qemu_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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int qemu_alarm_pending(void)
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{
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return alarm_timer->pending;
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}
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static inline int alarm_has_dynticks(struct qemu_alarm_timer *t)
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{
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return !!t->rearm;
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}
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static int64_t qemu_next_alarm_deadline(void)
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{
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int64_t delta;
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int64_t rtdelta;
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if (!use_icount && vm_clock->active_timers) {
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delta = vm_clock->active_timers->expire_time -
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qemu_get_clock_ns(vm_clock);
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} else {
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delta = INT32_MAX;
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}
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if (host_clock->active_timers) {
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int64_t hdelta = host_clock->active_timers->expire_time -
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qemu_get_clock_ns(host_clock);
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if (hdelta < delta) {
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delta = hdelta;
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}
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}
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if (rt_clock->active_timers) {
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rtdelta = (rt_clock->active_timers->expire_time -
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qemu_get_clock_ns(rt_clock));
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if (rtdelta < delta) {
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delta = rtdelta;
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}
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}
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return delta;
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}
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static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
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{
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int64_t nearest_delta_ns;
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assert(alarm_has_dynticks(t));
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if (!rt_clock->active_timers &&
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!vm_clock->active_timers &&
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!host_clock->active_timers) {
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return;
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}
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nearest_delta_ns = qemu_next_alarm_deadline();
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t->rearm(t, nearest_delta_ns);
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}
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/* TODO: MIN_TIMER_REARM_NS should be optimized */
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#define MIN_TIMER_REARM_NS 250000
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#ifdef _WIN32
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static int mm_start_timer(struct qemu_alarm_timer *t);
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static void mm_stop_timer(struct qemu_alarm_timer *t);
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static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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static int win32_start_timer(struct qemu_alarm_timer *t);
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static void win32_stop_timer(struct qemu_alarm_timer *t);
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static void win32_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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#else
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static int unix_start_timer(struct qemu_alarm_timer *t);
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static void unix_stop_timer(struct qemu_alarm_timer *t);
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static void unix_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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#ifdef __linux__
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static int dynticks_start_timer(struct qemu_alarm_timer *t);
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static void dynticks_stop_timer(struct qemu_alarm_timer *t);
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static void dynticks_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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#endif /* __linux__ */
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#endif /* _WIN32 */
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static struct qemu_alarm_timer alarm_timers[] = {
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#ifndef _WIN32
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#ifdef __linux__
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{"dynticks", dynticks_start_timer,
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dynticks_stop_timer, dynticks_rearm_timer},
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#endif
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{"unix", unix_start_timer, unix_stop_timer, unix_rearm_timer},
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#else
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{"mmtimer", mm_start_timer, mm_stop_timer, mm_rearm_timer},
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{"dynticks", win32_start_timer, win32_stop_timer, win32_rearm_timer},
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#endif
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{NULL, }
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};
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static void show_available_alarms(void)
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{
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int i;
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printf("Available alarm timers, in order of precedence:\n");
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for (i = 0; alarm_timers[i].name; i++)
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printf("%s\n", alarm_timers[i].name);
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}
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void configure_alarms(char const *opt)
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{
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int i;
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int cur = 0;
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int count = ARRAY_SIZE(alarm_timers) - 1;
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char *arg;
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char *name;
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struct qemu_alarm_timer tmp;
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if (!strcmp(opt, "?")) {
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show_available_alarms();
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exit(0);
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}
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arg = g_strdup(opt);
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/* Reorder the array */
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name = strtok(arg, ",");
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while (name) {
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for (i = 0; i < count && alarm_timers[i].name; i++) {
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if (!strcmp(alarm_timers[i].name, name))
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break;
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}
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if (i == count) {
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fprintf(stderr, "Unknown clock %s\n", name);
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goto next;
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}
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if (i < cur)
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/* Ignore */
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goto next;
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/* Swap */
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tmp = alarm_timers[i];
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alarm_timers[i] = alarm_timers[cur];
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alarm_timers[cur] = tmp;
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cur++;
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next:
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name = strtok(NULL, ",");
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}
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g_free(arg);
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if (cur) {
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/* Disable remaining timers */
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for (i = cur; i < count; i++)
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alarm_timers[i].name = NULL;
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} else {
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show_available_alarms();
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exit(1);
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}
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}
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QEMUClock *rt_clock;
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QEMUClock *vm_clock;
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QEMUClock *host_clock;
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static QEMUClock *qemu_new_clock(int type)
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{
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QEMUClock *clock;
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clock = g_malloc0(sizeof(QEMUClock));
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clock->type = type;
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clock->enabled = 1;
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clock->last = INT64_MIN;
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notifier_list_init(&clock->reset_notifiers);
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return clock;
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}
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void qemu_clock_enable(QEMUClock *clock, int enabled)
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{
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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_rearm_alarm_timer(alarm_timer);
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}
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}
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int64_t qemu_clock_has_timers(QEMUClock *clock)
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{
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return !!clock->active_timers;
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}
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int64_t qemu_clock_expired(QEMUClock *clock)
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{
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return (clock->active_timers &&
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clock->active_timers->expire_time < qemu_get_clock_ns(clock));
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}
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int64_t qemu_clock_deadline(QEMUClock *clock)
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{
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/* To avoid problems with overflow limit this to 2^32. */
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int64_t delta = INT32_MAX;
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if (clock->active_timers) {
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delta = clock->active_timers->expire_time - qemu_get_clock_ns(clock);
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}
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if (delta < 0) {
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delta = 0;
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}
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return delta;
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}
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QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
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QEMUTimerCB *cb, void *opaque)
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{
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QEMUTimer *ts;
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ts = g_malloc0(sizeof(QEMUTimer));
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ts->clock = clock;
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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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return ts;
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}
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void qemu_free_timer(QEMUTimer *ts)
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{
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g_free(ts);
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}
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/* stop a timer, but do not dealloc it */
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void qemu_del_timer(QEMUTimer *ts)
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{
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QEMUTimer **pt, *t;
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/* NOTE: this code must be signal safe because
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qemu_timer_expired() can be called from a signal. */
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pt = &ts->clock->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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*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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/* 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 qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time)
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{
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QEMUTimer **pt, *t;
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qemu_del_timer(ts);
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/* add the timer in the sorted list */
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/* NOTE: this code must be signal safe because
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qemu_timer_expired() can be called from a signal. */
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pt = &ts->clock->active_timers;
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for(;;) {
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t = *pt;
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if (!qemu_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 = expire_time;
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ts->next = *pt;
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*pt = ts;
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/* Rearm if necessary */
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if (pt == &ts->clock->active_timers) {
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if (!alarm_timer->pending) {
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qemu_rearm_alarm_timer(alarm_timer);
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}
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/* Interrupt execution to force deadline recalculation. */
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qemu_clock_warp(ts->clock);
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if (use_icount) {
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qemu_notify_event();
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}
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}
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}
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void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
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{
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qemu_mod_timer_ns(ts, expire_time * ts->scale);
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}
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int qemu_timer_pending(QEMUTimer *ts)
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{
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QEMUTimer *t;
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for (t = ts->clock->active_timers; t != NULL; t = t->next) {
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if (t == ts)
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return 1;
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}
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return 0;
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}
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int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
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{
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return qemu_timer_expired_ns(timer_head, current_time * timer_head->scale);
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}
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static void qemu_run_timers(QEMUClock *clock)
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{
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QEMUTimer **ptimer_head, *ts;
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int64_t current_time;
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if (!clock->enabled)
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return;
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current_time = qemu_get_clock_ns(clock);
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ptimer_head = &clock->active_timers;
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for(;;) {
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ts = *ptimer_head;
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if (!qemu_timer_expired_ns(ts, current_time)) {
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break;
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}
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/* remove timer from the list before calling the callback */
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*ptimer_head = ts->next;
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ts->next = NULL;
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/* run the callback (the timer list can be modified) */
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ts->cb(ts->opaque);
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}
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}
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int64_t qemu_get_clock_ns(QEMUClock *clock)
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{
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int64_t now, last;
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switch(clock->type) {
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case QEMU_CLOCK_REALTIME:
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return get_clock();
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default:
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case QEMU_CLOCK_VIRTUAL:
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if (use_icount) {
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return cpu_get_icount();
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} else {
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return cpu_get_clock();
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}
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case QEMU_CLOCK_HOST:
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now = get_clock_realtime();
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last = clock->last;
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clock->last = now;
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if (now < last) {
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notifier_list_notify(&clock->reset_notifiers, &now);
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}
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return now;
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}
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}
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void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
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{
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notifier_list_add(&clock->reset_notifiers, notifier);
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}
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void qemu_unregister_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
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{
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notifier_list_remove(&clock->reset_notifiers, notifier);
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}
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void init_clocks(void)
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{
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rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME);
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vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL);
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host_clock = qemu_new_clock(QEMU_CLOCK_HOST);
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}
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uint64_t qemu_timer_expire_time_ns(QEMUTimer *ts)
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{
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return qemu_timer_pending(ts) ? ts->expire_time : -1;
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}
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void qemu_run_all_timers(void)
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{
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alarm_timer->pending = 0;
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/* rearm timer, if not periodic */
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if (alarm_timer->expired) {
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alarm_timer->expired = 0;
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qemu_rearm_alarm_timer(alarm_timer);
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}
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/* vm time timers */
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qemu_run_timers(vm_clock);
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qemu_run_timers(rt_clock);
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qemu_run_timers(host_clock);
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}
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#ifdef _WIN32
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static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused)
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#else
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static void host_alarm_handler(int host_signum)
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#endif
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{
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struct qemu_alarm_timer *t = alarm_timer;
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if (!t)
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return;
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#if 0
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#define DISP_FREQ 1000
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{
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static int64_t delta_min = INT64_MAX;
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static int64_t delta_max, delta_cum, last_clock, delta, ti;
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static int count;
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ti = qemu_get_clock_ns(vm_clock);
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if (last_clock != 0) {
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delta = ti - last_clock;
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if (delta < delta_min)
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delta_min = delta;
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if (delta > delta_max)
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delta_max = delta;
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delta_cum += delta;
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if (++count == DISP_FREQ) {
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printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n",
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muldiv64(delta_min, 1000000, get_ticks_per_sec()),
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muldiv64(delta_max, 1000000, get_ticks_per_sec()),
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muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()),
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(double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ));
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count = 0;
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delta_min = INT64_MAX;
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delta_max = 0;
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delta_cum = 0;
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}
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}
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last_clock = ti;
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}
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#endif
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if (alarm_has_dynticks(t) ||
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qemu_next_alarm_deadline () <= 0) {
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t->expired = alarm_has_dynticks(t);
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t->pending = 1;
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qemu_notify_event();
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}
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}
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#if defined(__linux__)
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#include "compatfd.h"
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static int dynticks_start_timer(struct qemu_alarm_timer *t)
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{
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struct sigevent ev;
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timer_t host_timer;
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struct sigaction act;
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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act.sa_handler = host_alarm_handler;
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sigaction(SIGALRM, &act, NULL);
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/*
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* Initialize ev struct to 0 to avoid valgrind complaining
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* about uninitialized data in timer_create call
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*/
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memset(&ev, 0, sizeof(ev));
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ev.sigev_value.sival_int = 0;
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ev.sigev_notify = SIGEV_SIGNAL;
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#ifdef SIGEV_THREAD_ID
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if (qemu_signalfd_available()) {
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ev.sigev_notify = SIGEV_THREAD_ID;
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ev._sigev_un._tid = qemu_get_thread_id();
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}
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#endif /* SIGEV_THREAD_ID */
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ev.sigev_signo = SIGALRM;
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if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
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perror("timer_create");
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/* disable dynticks */
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fprintf(stderr, "Dynamic Ticks disabled\n");
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return -1;
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}
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t->timer = host_timer;
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return 0;
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}
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static void dynticks_stop_timer(struct qemu_alarm_timer *t)
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{
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timer_t host_timer = t->timer;
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timer_delete(host_timer);
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}
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static void dynticks_rearm_timer(struct qemu_alarm_timer *t,
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int64_t nearest_delta_ns)
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{
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timer_t host_timer = t->timer;
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struct itimerspec timeout;
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int64_t current_ns;
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if (nearest_delta_ns < MIN_TIMER_REARM_NS)
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nearest_delta_ns = MIN_TIMER_REARM_NS;
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/* check whether a timer is already running */
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if (timer_gettime(host_timer, &timeout)) {
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perror("gettime");
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fprintf(stderr, "Internal timer error: aborting\n");
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exit(1);
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}
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current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec;
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if (current_ns && current_ns <= nearest_delta_ns)
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return;
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timeout.it_interval.tv_sec = 0;
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timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */
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timeout.it_value.tv_sec = nearest_delta_ns / 1000000000;
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timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000;
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if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) {
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perror("settime");
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fprintf(stderr, "Internal timer error: aborting\n");
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exit(1);
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}
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}
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#endif /* defined(__linux__) */
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#if !defined(_WIN32)
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static int unix_start_timer(struct qemu_alarm_timer *t)
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{
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struct sigaction act;
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/* timer signal */
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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act.sa_handler = host_alarm_handler;
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sigaction(SIGALRM, &act, NULL);
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return 0;
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}
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static void unix_rearm_timer(struct qemu_alarm_timer *t,
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int64_t nearest_delta_ns)
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{
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struct itimerval itv;
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int err;
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if (nearest_delta_ns < MIN_TIMER_REARM_NS)
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nearest_delta_ns = MIN_TIMER_REARM_NS;
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itv.it_interval.tv_sec = 0;
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itv.it_interval.tv_usec = 0; /* 0 for one-shot timer */
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itv.it_value.tv_sec = nearest_delta_ns / 1000000000;
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itv.it_value.tv_usec = (nearest_delta_ns % 1000000000) / 1000;
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err = setitimer(ITIMER_REAL, &itv, NULL);
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if (err) {
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perror("setitimer");
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fprintf(stderr, "Internal timer error: aborting\n");
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exit(1);
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}
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}
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static void unix_stop_timer(struct qemu_alarm_timer *t)
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{
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struct itimerval itv;
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memset(&itv, 0, sizeof(itv));
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setitimer(ITIMER_REAL, &itv, NULL);
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}
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#endif /* !defined(_WIN32) */
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#ifdef _WIN32
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static MMRESULT mm_timer;
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static unsigned mm_period;
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static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg,
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DWORD_PTR dwUser, DWORD_PTR dw1,
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DWORD_PTR dw2)
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{
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struct qemu_alarm_timer *t = alarm_timer;
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if (!t) {
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return;
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}
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if (alarm_has_dynticks(t) || qemu_next_alarm_deadline() <= 0) {
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t->expired = alarm_has_dynticks(t);
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t->pending = 1;
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qemu_notify_event();
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}
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}
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static int mm_start_timer(struct qemu_alarm_timer *t)
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{
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TIMECAPS tc;
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UINT flags;
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memset(&tc, 0, sizeof(tc));
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timeGetDevCaps(&tc, sizeof(tc));
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mm_period = tc.wPeriodMin;
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timeBeginPeriod(mm_period);
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flags = TIME_CALLBACK_FUNCTION;
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if (alarm_has_dynticks(t)) {
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flags |= TIME_ONESHOT;
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} else {
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flags |= TIME_PERIODIC;
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}
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mm_timer = timeSetEvent(1, /* interval (ms) */
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mm_period, /* resolution */
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mm_alarm_handler, /* function */
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(DWORD_PTR)t, /* parameter */
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flags);
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if (!mm_timer) {
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fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
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GetLastError());
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timeEndPeriod(mm_period);
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return -1;
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}
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return 0;
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}
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static void mm_stop_timer(struct qemu_alarm_timer *t)
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{
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timeKillEvent(mm_timer);
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timeEndPeriod(mm_period);
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}
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static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta)
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{
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int nearest_delta_ms = (delta + 999999) / 1000000;
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if (nearest_delta_ms < 1) {
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nearest_delta_ms = 1;
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}
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timeKillEvent(mm_timer);
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mm_timer = timeSetEvent(nearest_delta_ms,
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mm_period,
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mm_alarm_handler,
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(DWORD_PTR)t,
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TIME_ONESHOT | TIME_CALLBACK_FUNCTION);
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if (!mm_timer) {
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fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n",
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GetLastError());
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timeEndPeriod(mm_period);
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exit(1);
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}
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}
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static int win32_start_timer(struct qemu_alarm_timer *t)
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{
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HANDLE hTimer;
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BOOLEAN success;
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/* If you call ChangeTimerQueueTimer on a one-shot timer (its period
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is zero) that has already expired, the timer is not updated. Since
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creating a new timer is relatively expensive, set a bogus one-hour
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interval in the dynticks case. */
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success = CreateTimerQueueTimer(&hTimer,
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NULL,
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host_alarm_handler,
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t,
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1,
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alarm_has_dynticks(t) ? 3600000 : 1,
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WT_EXECUTEINTIMERTHREAD);
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if (!success) {
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fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
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GetLastError());
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return -1;
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}
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t->timer = hTimer;
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return 0;
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}
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static void win32_stop_timer(struct qemu_alarm_timer *t)
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{
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HANDLE hTimer = t->timer;
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if (hTimer) {
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DeleteTimerQueueTimer(NULL, hTimer, NULL);
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}
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}
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static void win32_rearm_timer(struct qemu_alarm_timer *t,
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int64_t nearest_delta_ns)
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{
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HANDLE hTimer = t->timer;
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int nearest_delta_ms;
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BOOLEAN success;
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nearest_delta_ms = (nearest_delta_ns + 999999) / 1000000;
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if (nearest_delta_ms < 1) {
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nearest_delta_ms = 1;
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}
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success = ChangeTimerQueueTimer(NULL,
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hTimer,
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nearest_delta_ms,
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3600000);
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if (!success) {
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fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n",
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GetLastError());
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exit(-1);
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}
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}
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#endif /* _WIN32 */
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static void quit_timers(void)
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{
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struct qemu_alarm_timer *t = alarm_timer;
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alarm_timer = NULL;
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t->stop(t);
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}
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int init_timer_alarm(void)
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{
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struct qemu_alarm_timer *t = NULL;
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int i, err = -1;
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for (i = 0; alarm_timers[i].name; i++) {
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t = &alarm_timers[i];
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err = t->start(t);
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if (!err)
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break;
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}
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if (err) {
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err = -ENOENT;
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goto fail;
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}
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/* first event is at time 0 */
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atexit(quit_timers);
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t->pending = 1;
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alarm_timer = t;
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return 0;
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fail:
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return err;
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}
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int qemu_calculate_timeout(void)
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{
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return 1000;
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}
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