[Intel-gfx] [PATCH] drm/i915: Flush outstanding unpin tasks before pageflipping

[Chris Wilson]

If we accumulate unpin tasks because we are pageflipping faster than the
system can schedule its workers, we can effectively create a
pin-leak. The solution taken here is to limit the number of unpin tasks
we have per-crtc and to flush those outstanding tasks if we accumulate
too many. This should prevent any jitter in the normal case, and also
prevent the hang if we should run too fast.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=46991
Reported-and-tested-by: Tvrtko Ursulin <tvrtko.ursulin at onelan.co.uk>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_display.c |   22 ++++++++++++++++------
 drivers/gpu/drm/i915/intel_drv.h     |    4 +++-
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 69b1739..800b195 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6908,14 +6908,19 @@ static void intel_unpin_work_fn(struct work_struct *__work)
 {
 	struct intel_unpin_work *work =
 		container_of(__work, struct intel_unpin_work, work);
+	struct drm_device *dev = work->crtc->dev;
 
-	mutex_lock(&work->dev->struct_mutex);
+	mutex_lock(&dev->struct_mutex);
 	intel_unpin_fb_obj(work->old_fb_obj);
 	drm_gem_object_unreference(&work->pending_flip_obj->base);
 	drm_gem_object_unreference(&work->old_fb_obj->base);
 
-	intel_update_fbc(work->dev);
-	mutex_unlock(&work->dev->struct_mutex);
+	intel_update_fbc(dev);
+	mutex_unlock(&dev->struct_mutex);
+
+	BUG_ON(atomic_read(&to_intel_crtc(work->crtc)->unpin_work_count) == 0);
+	atomic_dec(&to_intel_crtc(work->crtc)->unpin_work_count);
+
 	kfree(work);
 }
 
@@ -6963,9 +6968,9 @@ static void do_intel_finish_page_flip(struct drm_device *dev,
 
 	atomic_clear_mask(1 << intel_crtc->plane,
 			  &obj->pending_flip.counter);
-
 	wake_up(&dev_priv->pending_flip_queue);
-	schedule_work(&work->work);
+
+	queue_work(dev_priv->wq, &work->work);
 
 	trace_i915_flip_complete(intel_crtc->plane, work->pending_flip_obj);
 }
@@ -7266,7 +7271,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 		return -ENOMEM;
 
 	work->event = event;
-	work->dev = crtc->dev;
+	work->crtc = crtc;
 	intel_fb = to_intel_framebuffer(crtc->fb);
 	work->old_fb_obj = intel_fb->obj;
 	INIT_WORK(&work->work, intel_unpin_work_fn);
@@ -7291,6 +7296,9 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 	intel_fb = to_intel_framebuffer(fb);
 	obj = intel_fb->obj;
 
+	if (atomic_read(&intel_crtc->unpin_work_count) >= 2)
+		flush_workqueue(dev_priv->wq);
+
 	ret = i915_mutex_lock_interruptible(dev);
 	if (ret)
 		goto cleanup;
@@ -7309,6 +7317,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 	 * the flip occurs and the object is no longer visible.
 	 */
 	atomic_add(1 << intel_crtc->plane, &work->old_fb_obj->pending_flip);
+	atomic_inc(&intel_crtc->unpin_work_count);
 
 	ret = dev_priv->display.queue_flip(dev, crtc, fb, obj);
 	if (ret)
@@ -7323,6 +7332,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 	return 0;
 
 cleanup_pending:
+	atomic_dec(&intel_crtc->unpin_work_count);
 	atomic_sub(1 << intel_crtc->plane, &work->old_fb_obj->pending_flip);
 	drm_gem_object_unreference(&work->old_fb_obj->base);
 	drm_gem_object_unreference(&obj->base);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 164696f..1345c44 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -216,6 +216,8 @@ struct intel_crtc {
 	} vblank_work;
 	int fdi_lanes;
 
+	atomic_t unpin_work_count;
+
 	/* Display surface base address adjustement for pageflips. Note that on
 	 * gen4+ this only adjusts up to a tile, offsets within a tile are
 	 * handled in the hw itself (with the TILEOFF register). */
@@ -403,7 +405,7 @@ intel_get_crtc_for_plane(struct drm_device *dev, int plane)
 
 struct intel_unpin_work {
 	struct work_struct work;
-	struct drm_device *dev;
+	struct drm_crtc *crtc;
 	struct drm_i915_gem_object *old_fb_obj;
 	struct drm_i915_gem_object *pending_flip_obj;
 	struct drm_pending_vblank_event *event;
-- 
1.7.10.4