drm: add per-event vblank event trace points

Allows us to track each process that requests and completes events.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 6d201a89441c..c2ecb3ed009f 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -588,6 +588,7 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
                 return -ENOMEM;
 
         e->pipe = pipe;
+        e->base.pid = current->pid;
         e->event.base.type = DRM_EVENT_VBLANK;
         e->event.base.length = sizeof e->event;
         e->event.user_data = vblwait->request.signal;
@@ -615,6 +616,9 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
         DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n",
                   vblwait->request.sequence, seq, pipe);
 
+        trace_drm_vblank_event_queued(current->pid, pipe,
+                                      vblwait->request.sequence);
+
         e->event.sequence = vblwait->request.sequence;
         if ((seq - vblwait->request.sequence) <= (1 << 23)) {
                 e->event.tv_sec = now.tv_sec;
@@ -622,6 +626,8 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
                 drm_vblank_put(dev, e->pipe);
                 list_add_tail(&e->base.link, &e->base.file_priv->event_list);
                 wake_up_interruptible(&e->base.file_priv->event_wait);
+                trace_drm_vblank_event_delivered(current->pid, pipe,
+                                                 vblwait->request.sequence);
         } else {
                 list_add_tail(&e->base.link, &dev->vblank_event_list);
         }
@@ -752,6 +758,8 @@ void drm_handle_vblank_events(struct drm_device *dev, int crtc)
                 drm_vblank_put(dev, e->pipe);
                 list_move_tail(&e->base.link, &e->base.file_priv->event_list);
                 wake_up_interruptible(&e->base.file_priv->event_wait);
+                trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
+                                                 e->event.sequence);
         }
 
         spin_unlock_irqrestore(&dev->event_lock, flags);