281 lines
6.7 KiB
C
281 lines
6.7 KiB
C
/*
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* replay-events.c
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*
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* Copyright (c) 2010-2015 Institute for System Programming
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* of the Russian Academy of Sciences.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu/error-report.h"
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#include "sysemu/replay.h"
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#include "replay-internal.h"
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#include "block/aio.h"
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#include "ui/input.h"
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typedef struct Event {
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ReplayAsyncEventKind event_kind;
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void *opaque;
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void *opaque2;
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uint64_t id;
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QTAILQ_ENTRY(Event) events;
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} Event;
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static QTAILQ_HEAD(, Event) events_list = QTAILQ_HEAD_INITIALIZER(events_list);
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static unsigned int read_event_kind = -1;
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static uint64_t read_id = -1;
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static int read_checkpoint = -1;
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static bool events_enabled;
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/* Functions */
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static void replay_run_event(Event *event)
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{
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switch (event->event_kind) {
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case REPLAY_ASYNC_EVENT_BH:
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aio_bh_call(event->opaque);
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break;
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case REPLAY_ASYNC_EVENT_INPUT:
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qemu_input_event_send_impl(NULL, (InputEvent *)event->opaque);
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qapi_free_InputEvent((InputEvent *)event->opaque);
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break;
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case REPLAY_ASYNC_EVENT_INPUT_SYNC:
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qemu_input_event_sync_impl();
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break;
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default:
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error_report("Replay: invalid async event ID (%d) in the queue",
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event->event_kind);
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exit(1);
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break;
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}
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}
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void replay_enable_events(void)
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{
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events_enabled = true;
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}
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bool replay_has_events(void)
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{
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return !QTAILQ_EMPTY(&events_list);
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}
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void replay_flush_events(void)
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{
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replay_mutex_lock();
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while (!QTAILQ_EMPTY(&events_list)) {
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Event *event = QTAILQ_FIRST(&events_list);
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replay_mutex_unlock();
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replay_run_event(event);
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replay_mutex_lock();
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QTAILQ_REMOVE(&events_list, event, events);
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g_free(event);
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}
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replay_mutex_unlock();
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}
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void replay_disable_events(void)
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{
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if (replay_mode != REPLAY_MODE_NONE) {
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events_enabled = false;
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/* Flush events queue before waiting of completion */
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replay_flush_events();
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}
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}
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void replay_clear_events(void)
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{
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replay_mutex_lock();
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while (!QTAILQ_EMPTY(&events_list)) {
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Event *event = QTAILQ_FIRST(&events_list);
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QTAILQ_REMOVE(&events_list, event, events);
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g_free(event);
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}
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replay_mutex_unlock();
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}
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/*! Adds specified async event to the queue */
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static void replay_add_event(ReplayAsyncEventKind event_kind,
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void *opaque,
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void *opaque2, uint64_t id)
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{
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assert(event_kind < REPLAY_ASYNC_COUNT);
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if (!replay_file || replay_mode == REPLAY_MODE_NONE
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|| !events_enabled) {
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Event e;
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e.event_kind = event_kind;
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e.opaque = opaque;
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e.opaque2 = opaque2;
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e.id = id;
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replay_run_event(&e);
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return;
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}
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Event *event = g_malloc0(sizeof(Event));
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event->event_kind = event_kind;
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event->opaque = opaque;
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event->opaque2 = opaque2;
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event->id = id;
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replay_mutex_lock();
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QTAILQ_INSERT_TAIL(&events_list, event, events);
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replay_mutex_unlock();
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}
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void replay_bh_schedule_event(QEMUBH *bh)
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{
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if (replay_mode != REPLAY_MODE_NONE) {
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uint64_t id = replay_get_current_step();
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replay_add_event(REPLAY_ASYNC_EVENT_BH, bh, NULL, id);
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} else {
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qemu_bh_schedule(bh);
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}
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}
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void replay_add_input_event(struct InputEvent *event)
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{
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replay_add_event(REPLAY_ASYNC_EVENT_INPUT, event, NULL, 0);
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}
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void replay_add_input_sync_event(void)
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{
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replay_add_event(REPLAY_ASYNC_EVENT_INPUT_SYNC, NULL, NULL, 0);
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}
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static void replay_save_event(Event *event, int checkpoint)
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{
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if (replay_mode != REPLAY_MODE_PLAY) {
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/* put the event into the file */
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replay_put_event(EVENT_ASYNC);
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replay_put_byte(checkpoint);
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replay_put_byte(event->event_kind);
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/* save event-specific data */
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switch (event->event_kind) {
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case REPLAY_ASYNC_EVENT_BH:
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replay_put_qword(event->id);
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break;
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case REPLAY_ASYNC_EVENT_INPUT:
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replay_save_input_event(event->opaque);
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break;
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case REPLAY_ASYNC_EVENT_INPUT_SYNC:
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break;
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default:
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error_report("Unknown ID %d of replay event", read_event_kind);
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exit(1);
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}
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}
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}
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/* Called with replay mutex locked */
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void replay_save_events(int checkpoint)
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{
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while (!QTAILQ_EMPTY(&events_list)) {
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Event *event = QTAILQ_FIRST(&events_list);
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replay_save_event(event, checkpoint);
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replay_mutex_unlock();
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replay_run_event(event);
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replay_mutex_lock();
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QTAILQ_REMOVE(&events_list, event, events);
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g_free(event);
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}
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}
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static Event *replay_read_event(int checkpoint)
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{
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Event *event;
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if (read_event_kind == -1) {
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read_checkpoint = replay_get_byte();
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read_event_kind = replay_get_byte();
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read_id = -1;
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replay_check_error();
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}
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if (checkpoint != read_checkpoint) {
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return NULL;
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}
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/* Events that has not to be in the queue */
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switch (read_event_kind) {
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case REPLAY_ASYNC_EVENT_BH:
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if (read_id == -1) {
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read_id = replay_get_qword();
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}
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break;
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case REPLAY_ASYNC_EVENT_INPUT:
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event = g_malloc0(sizeof(Event));
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event->event_kind = read_event_kind;
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event->opaque = replay_read_input_event();
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return event;
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case REPLAY_ASYNC_EVENT_INPUT_SYNC:
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event = g_malloc0(sizeof(Event));
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event->event_kind = read_event_kind;
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event->opaque = 0;
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return event;
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default:
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error_report("Unknown ID %d of replay event", read_event_kind);
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exit(1);
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break;
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}
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QTAILQ_FOREACH(event, &events_list, events) {
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if (event->event_kind == read_event_kind
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&& (read_id == -1 || read_id == event->id)) {
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break;
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}
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}
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if (event) {
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QTAILQ_REMOVE(&events_list, event, events);
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} else {
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return NULL;
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}
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/* Read event-specific data */
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return event;
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}
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/* Called with replay mutex locked */
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void replay_read_events(int checkpoint)
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{
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while (replay_data_kind == EVENT_ASYNC) {
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Event *event = replay_read_event(checkpoint);
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if (!event) {
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break;
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}
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replay_mutex_unlock();
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replay_run_event(event);
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replay_mutex_lock();
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g_free(event);
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replay_finish_event();
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read_event_kind = -1;
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}
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}
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void replay_init_events(void)
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{
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read_event_kind = -1;
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}
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void replay_finish_events(void)
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{
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events_enabled = false;
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replay_clear_events();
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}
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bool replay_events_enabled(void)
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{
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return events_enabled;
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}
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