[Qemu-devel] [PATCH v14 16/21] replay: ptimer

[Pavel Dovgalyuk]

This patch adds deterministic replay for hardware periodic countdown timers.

Signed-off-by: Pavel Dovgalyuk <pavel.dovga...@ispras.ru>
---
 hw/core/ptimer.c         |    7 ++++++-
 replay/replay-events.c   |   17 +++++++++++++++++
 replay/replay-internal.h |    1 +
 replay/replay.h          |    2 ++
 4 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/hw/core/ptimer.c b/hw/core/ptimer.c
index 8437bd6..c56078d 100644
--- a/hw/core/ptimer.c
+++ b/hw/core/ptimer.c
@@ -9,6 +9,7 @@
 #include "qemu/timer.h"
 #include "hw/ptimer.h"
 #include "qemu/host-utils.h"
+#include "replay/replay.h"
 
 struct ptimer_state
 {
@@ -27,7 +28,11 @@ struct ptimer_state
 static void ptimer_trigger(ptimer_state *s)
 {
     if (s->bh) {
-        qemu_bh_schedule(s->bh);
+        if (replay_mode != REPLAY_MODE_NONE) {
+            replay_add_ptimer_event(s->bh, replay_get_current_step());
+        } else {
+            qemu_bh_schedule(s->bh);
+        }
     }
 }
 
diff --git a/replay/replay-events.c b/replay/replay-events.c
index 409c9ad..1e14cce 100755
--- a/replay/replay-events.c
+++ b/replay/replay-events.c
@@ -13,6 +13,7 @@
 #include "qemu/error-report.h"
 #include "replay.h"
 #include "replay-internal.h"
+#include "block/aio.h"
 
 typedef struct Event {
     ReplayAsyncEventKind event_kind;
@@ -35,6 +36,9 @@ static bool events_enabled = false;
 static void replay_run_event(Event *event)
 {
     switch (event->event_kind) {
+    case REPLAY_ASYNC_EVENT_PTIMER:
+        aio_bh_call(event->opaque);
+        break;
     default:
         error_report("Replay: invalid async event ID (%d) in the queue",
                     event->event_kind);
@@ -123,6 +127,11 @@ void replay_add_event(ReplayAsyncEventKind event_kind, 
void *opaque)
     replay_add_event_internal(event_kind, opaque, NULL, 0);
 }
 
+void replay_add_ptimer_event(void *bh, uint64_t id)
+{
+    replay_add_event_internal(REPLAY_ASYNC_EVENT_PTIMER, bh, NULL, id);
+}
+
 static void replay_save_event(Event *event, int checkpoint)
 {
     if (replay_mode != REPLAY_MODE_PLAY) {
@@ -133,6 +142,9 @@ static void replay_save_event(Event *event, int checkpoint)
 
         /* save event-specific data */
         switch (event->event_kind) {
+        case REPLAY_ASYNC_EVENT_PTIMER:
+            replay_put_qword(event->id);
+            break;
         }
     }
 }
@@ -168,6 +180,11 @@ static Event *replay_read_event(int checkpoint)
 
     /* Events that has not to be in the queue */
     switch (read_event_kind) {
+    case REPLAY_ASYNC_EVENT_PTIMER:
+        if (read_id == -1) {
+            read_id = replay_get_qword();
+        }
+        break;
     default:
         error_report("Unknown ID %d of replay event", read_event_kind);
         exit(1);
diff --git a/replay/replay-internal.h b/replay/replay-internal.h
index f758371..4ae451f 100755
--- a/replay/replay-internal.h
+++ b/replay/replay-internal.h
@@ -39,6 +39,7 @@ enum ReplayEvents {
 /* Asynchronous events IDs */
 
 enum ReplayAsyncEventKind {
+    REPLAY_ASYNC_EVENT_PTIMER,
     REPLAY_ASYNC_COUNT
 };
 
diff --git a/replay/replay.h b/replay/replay.h
index b6c4a8d..e97b87c 100755
--- a/replay/replay.h
+++ b/replay/replay.h
@@ -96,5 +96,7 @@ bool replay_checkpoint(ReplayCheckpoint checkpoint);
 void replay_disable_events(void);
 /*! Returns true when saving events is enabled */
 bool replay_events_enabled(void);
+/*! Adds ptimer event to the queue */
+void replay_add_ptimer_event(void *bh, uint64_t id);
 
 #endif