sync: add timestamps to sync_pts

Change-Id: I2ad855072b86873880769a09a3176e85aa1199d7
Signed-off-by: Erik Gilling <konkers@android.com>

diff --git a/drivers/base/sync.c b/drivers/base/sync.c
index 4a8604b7f3a4a4b30d3dd5a284d23e5ee4843c22..ea0b66424e2cd5e123fb0810fd344cebfd61ff38 100644 (file)
--- a/drivers/base/sync.c
+++ b/drivers/base/sync.c
@@ -155,12 +155,17 @@ void sync_pt_free(struct sync_pt *pt)
 /* call with pt->parent->active_list_lock held */
 static int _sync_pt_has_signaled(struct sync_pt *pt)
 {
+       int old_status = pt->status;
+
        if (!pt->status)
                pt->status = pt->parent->ops->has_signaled(pt);
 
        if (!pt->status && pt->parent->destroyed)
                pt->status = -ENOENT;
 
+       if (pt->status != old_status)
+               pt->timestamp = ktime_get();
+
        return pt->status;
 }
 

diff --git a/include/linux/sync.h b/include/linux/sync.h
index 388acd1ff4121e3128e189075afe615adae59e6c..a8e289d50ae01f6f2e35a9600998c3f0518b0f57 100644 (file)
--- a/include/linux/sync.h
+++ b/include/linux/sync.h
@@ -16,6 +16,7 @@
 #include <linux/types.h>
 #ifdef __KERNEL__
 
+#include <linux/ktime.h>
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/wait.h>
@@ -90,6 +91,8 @@ struct sync_timeline {
  * @fence:             sync_fence to which the sync_pt belongs
  * @pt_list:           membership in sync_fence.pt_list_head
  * @status:            1: signaled, 0:active, <0: error
+ * @timestamp:         time which sync_pt status transitioned from active to
+ *                       singaled or error.
  */
 struct sync_pt {
        struct sync_timeline            *parent;
@@ -102,6 +105,8 @@ struct sync_pt {
 
        /* protected by parent->active_list_lock */
        int                     status;
+
+       ktime_t                 timestamp;
 };
 
 /**