[PATCH 2/9] drm/i915: Convert flip_work to a list, v2.

Maarten Lankhorst maarten.lankhorst at linux.intel.com
Wed May 25 10:26:37 UTC 2016


This will be required to allow more than 1 outstanding
update in the future. For now it's unclear how this will
will be handled, but with a list it's definitely possible.

Changes since v1:
- Changed to prevent breaking with the legacy cursor update changes.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c  |  90 +++++++++++---------
 drivers/gpu/drm/i915/i915_drv.h      |   2 +-
 drivers/gpu/drm/i915/intel_display.c | 156 +++++++++++++++++++++--------------
 drivers/gpu/drm/i915/intel_drv.h     |   4 +-
 4 files changed, 149 insertions(+), 103 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index ac7e5692496d..cced527af109 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -621,6 +621,53 @@ static int i915_gem_gtt_info(struct seq_file *m, void *data)
 	return 0;
 }
 
+static void i915_dump_pageflip(struct seq_file *m,
+			       struct drm_i915_private *dev_priv,
+			       struct intel_crtc *crtc,
+			       struct intel_flip_work *work)
+{
+	const char pipe = pipe_name(crtc->pipe);
+	const char plane = plane_name(crtc->plane);
+	u32 pending;
+	u32 addr;
+
+	pending = atomic_read(&work->pending);
+	if (pending) {
+		seq_printf(m, "Flip ioctl preparing on pipe %c (plane %c)\n",
+			   pipe, plane);
+	} else {
+		seq_printf(m, "Flip pending (waiting for vsync) on pipe %c (plane %c)\n",
+			   pipe, plane);
+	}
+	if (work->flip_queued_req) {
+		struct intel_engine_cs *engine = i915_gem_request_get_engine(work->flip_queued_req);
+
+		seq_printf(m, "Flip queued on %s at seqno %x, next seqno %x [current breadcrumb %x], completed? %d\n",
+			   engine->name,
+			   i915_gem_request_get_seqno(work->flip_queued_req),
+			   dev_priv->next_seqno,
+			   engine->get_seqno(engine),
+			   i915_gem_request_completed(work->flip_queued_req, true));
+	} else
+		seq_printf(m, "Flip not associated with any ring\n");
+	seq_printf(m, "Flip queued on frame %d, (was ready on frame %d), now %d\n",
+		   work->flip_queued_vblank,
+		   work->flip_ready_vblank,
+		   intel_crtc_get_vblank_counter(crtc));
+	seq_printf(m, "%d prepares\n", atomic_read(&work->pending));
+
+	if (INTEL_INFO(dev_priv)->gen >= 4)
+		addr = I915_HI_DISPBASE(I915_READ(DSPSURF(crtc->plane)));
+	else
+		addr = I915_READ(DSPADDR(crtc->plane));
+	seq_printf(m, "Current scanout address 0x%08x\n", addr);
+
+	if (work->pending_flip_obj) {
+		seq_printf(m, "New framebuffer address 0x%08lx\n", (long)work->gtt_offset);
+		seq_printf(m, "MMIO update completed? %d\n",  addr == work->gtt_offset);
+	}
+}
+
 static int i915_gem_pageflip_info(struct seq_file *m, void *data)
 {
 	struct drm_info_node *node = m->private;
@@ -639,48 +686,13 @@ static int i915_gem_pageflip_info(struct seq_file *m, void *data)
 		struct intel_flip_work *work;
 
 		spin_lock_irq(&dev->event_lock);
-		work = crtc->flip_work;
-		if (work == NULL) {
+		if (list_empty(&crtc->flip_work)) {
 			seq_printf(m, "No flip due on pipe %c (plane %c)\n",
 				   pipe, plane);
 		} else {
-			u32 pending;
-			u32 addr;
-
-			pending = atomic_read(&work->pending);
-			if (pending) {
-				seq_printf(m, "Flip ioctl preparing on pipe %c (plane %c)\n",
-					   pipe, plane);
-			} else {
-				seq_printf(m, "Flip pending (waiting for vsync) on pipe %c (plane %c)\n",
-					   pipe, plane);
-			}
-			if (work->flip_queued_req) {
-				struct intel_engine_cs *engine = i915_gem_request_get_engine(work->flip_queued_req);
-
-				seq_printf(m, "Flip queued on %s at seqno %x, next seqno %x [current breadcrumb %x], completed? %d\n",
-					   engine->name,
-					   i915_gem_request_get_seqno(work->flip_queued_req),
-					   dev_priv->next_seqno,
-					   engine->get_seqno(engine),
-					   i915_gem_request_completed(work->flip_queued_req, true));
-			} else
-				seq_printf(m, "Flip not associated with any ring\n");
-			seq_printf(m, "Flip queued on frame %d, (was ready on frame %d), now %d\n",
-				   work->flip_queued_vblank,
-				   work->flip_ready_vblank,
-				   intel_crtc_get_vblank_counter(crtc));
-			seq_printf(m, "%d prepares\n", atomic_read(&work->pending));
-
-			if (INTEL_INFO(dev)->gen >= 4)
-				addr = I915_HI_DISPBASE(I915_READ(DSPSURF(crtc->plane)));
-			else
-				addr = I915_READ(DSPADDR(crtc->plane));
-			seq_printf(m, "Current scanout address 0x%08x\n", addr);
-
-			if (work->pending_flip_obj) {
-				seq_printf(m, "New framebuffer address 0x%08lx\n", (long)work->gtt_offset);
-				seq_printf(m, "MMIO update completed? %d\n",  addr == work->gtt_offset);
+			list_for_each_entry(work, &crtc->flip_work, head) {
+				i915_dump_pageflip(m, dev_priv, crtc, work);
+				seq_puts(m, "\n");
 			}
 		}
 		spin_unlock_irq(&dev->event_lock);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e4c8e341655c..ce1d368e4e50 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -622,7 +622,7 @@ struct drm_i915_display_funcs {
 			  struct drm_framebuffer *fb,
 			  struct drm_i915_gem_object *obj,
 			  struct drm_i915_gem_request *req,
-			  uint32_t flags);
+			  uint64_t gtt_offset);
 	void (*hpd_irq_setup)(struct drm_i915_private *dev_priv);
 	/* clock updates for mode set */
 	/* cursor updates */
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ae8036b5fe7c..ffd9b555d23f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3214,17 +3214,12 @@ static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
 	struct drm_device *dev = crtc->dev;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	unsigned reset_counter;
-	bool pending;
 
 	reset_counter = i915_reset_counter(&to_i915(dev)->gpu_error);
 	if (intel_crtc->reset_counter != reset_counter)
 		return false;
 
-	spin_lock_irq(&dev->event_lock);
-	pending = to_intel_crtc(crtc)->flip_work != NULL;
-	spin_unlock_irq(&dev->event_lock);
-
-	return pending;
+	return !list_empty_careful(&to_intel_crtc(crtc)->flip_work);
 }
 
 static void intel_update_pipe_config(struct intel_crtc *crtc,
@@ -3800,7 +3795,7 @@ bool intel_has_pending_fb_unpin(struct drm_device *dev)
 		if (atomic_read(&crtc->unpin_work_count) == 0)
 			continue;
 
-		if (crtc->flip_work)
+		if (!list_empty_careful(&crtc->flip_work))
 			intel_wait_for_vblank(dev, crtc->pipe);
 
 		return true;
@@ -3809,12 +3804,11 @@ bool intel_has_pending_fb_unpin(struct drm_device *dev)
 	return false;
 }
 
-static void page_flip_completed(struct intel_crtc *intel_crtc)
+static void page_flip_completed(struct intel_crtc *intel_crtc, struct intel_flip_work *work)
 {
 	struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
-	struct intel_flip_work *work = intel_crtc->flip_work;
 
-	intel_crtc->flip_work = NULL;
+	list_del_init(&work->head);
 
 	if (work->event)
 		drm_crtc_send_vblank_event(&intel_crtc->base, work->event);
@@ -3849,10 +3843,16 @@ static int intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
 		struct intel_flip_work *work;
 
 		spin_lock_irq(&dev->event_lock);
-		work = intel_crtc->flip_work;
+
+		/*
+		 * If we're waiting for page flips, it's the first
+		 * flip on the list that's stuck.
+		 */
+		work = list_first_entry_or_null(&intel_crtc->flip_work,
+						struct intel_flip_work, head);
 		if (work && !is_mmio_work(work)) {
 			WARN_ONCE(1, "Removing stuck page flip\n");
-			page_flip_completed(intel_crtc);
+			page_flip_completed(intel_crtc, work);
 		}
 		spin_unlock_irq(&dev->event_lock);
 	}
@@ -6273,7 +6273,7 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
 		return;
 
 	if (to_intel_plane_state(crtc->primary->state)->visible) {
-		WARN_ON(intel_crtc->flip_work);
+		WARN_ON(list_empty(&intel_crtc->flip_work));
 
 		intel_pre_disable_primary_noatomic(crtc);
 
@@ -10935,15 +10935,19 @@ static void intel_crtc_destroy(struct drm_crtc *crtc)
 	struct intel_flip_work *work;
 
 	spin_lock_irq(&dev->event_lock);
-	work = intel_crtc->flip_work;
-	intel_crtc->flip_work = NULL;
-	spin_unlock_irq(&dev->event_lock);
+	while (!list_empty(&intel_crtc->flip_work)) {
+		work = list_first_entry(&intel_crtc->flip_work,
+					struct intel_flip_work, head);
+		list_del_init(&work->head);
+		spin_unlock_irq(&dev->event_lock);
 
-	if (work) {
 		cancel_work_sync(&work->mmio_work);
 		cancel_work_sync(&work->unpin_work);
 		kfree(work);
+
+		spin_lock_irq(&dev->event_lock);
 	}
+	spin_unlock_irq(&dev->event_lock);
 
 	drm_crtc_cleanup(crtc);
 
@@ -11031,9 +11035,9 @@ static bool __pageflip_finished_cs(struct intel_crtc *crtc,
 	 * anyway, we don't really care.
 	 */
 	return (I915_READ(DSPSURFLIVE(crtc->plane)) & ~0xfff) ==
-		crtc->flip_work->gtt_offset &&
+		work->gtt_offset &&
 		g4x_flip_count_after_eq(I915_READ(PIPE_FLIPCOUNT_G4X(crtc->pipe)),
-				    crtc->flip_work->flip_count);
+					work->flip_count);
 }
 
 static bool
@@ -11083,13 +11087,19 @@ void intel_finish_page_flip_cs(struct drm_i915_private *dev_priv, int pipe)
 	 * lost pageflips) so needs the full irqsave spinlocks.
 	 */
 	spin_lock_irqsave(&dev->event_lock, flags);
-	work = intel_crtc->flip_work;
+	while (!list_empty(&intel_crtc->flip_work)) {
+		work = list_first_entry(&intel_crtc->flip_work,
+					struct intel_flip_work,
+					head);
+
+		if (is_mmio_work(work))
+			break;
 
-	if (work != NULL &&
-	    !is_mmio_work(work) &&
-	    pageflip_finished(intel_crtc, work))
-		page_flip_completed(intel_crtc);
+		if (!pageflip_finished(intel_crtc, work))
+			break;
 
+		page_flip_completed(intel_crtc, work);
+	}
 	spin_unlock_irqrestore(&dev->event_lock, flags);
 }
 
@@ -11110,13 +11120,19 @@ void intel_finish_page_flip_mmio(struct drm_i915_private *dev_priv, int pipe)
 	 * lost pageflips) so needs the full irqsave spinlocks.
 	 */
 	spin_lock_irqsave(&dev->event_lock, flags);
-	work = intel_crtc->flip_work;
+	while (!list_empty(&intel_crtc->flip_work)) {
+		work = list_first_entry(&intel_crtc->flip_work,
+					struct intel_flip_work,
+					head);
 
-	if (work != NULL &&
-	    is_mmio_work(work) &&
-	    pageflip_finished(intel_crtc, work))
-		page_flip_completed(intel_crtc);
+		if (!is_mmio_work(work))
+			break;
 
+		if (!pageflip_finished(intel_crtc, work))
+			break;
+
+		page_flip_completed(intel_crtc, work);
+	}
 	spin_unlock_irqrestore(&dev->event_lock, flags);
 }
 
@@ -11135,7 +11151,7 @@ static int intel_gen2_queue_flip(struct drm_device *dev,
 				 struct drm_framebuffer *fb,
 				 struct drm_i915_gem_object *obj,
 				 struct drm_i915_gem_request *req,
-				 uint32_t flags)
+				 uint64_t gtt_offset)
 {
 	struct intel_engine_cs *engine = req->engine;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
@@ -11158,7 +11174,7 @@ static int intel_gen2_queue_flip(struct drm_device *dev,
 	intel_ring_emit(engine, MI_DISPLAY_FLIP |
 			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
 	intel_ring_emit(engine, fb->pitches[0]);
-	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
+	intel_ring_emit(engine, gtt_offset);
 	intel_ring_emit(engine, 0); /* aux display base address, unused */
 
 	return 0;
@@ -11169,7 +11185,7 @@ static int intel_gen3_queue_flip(struct drm_device *dev,
 				 struct drm_framebuffer *fb,
 				 struct drm_i915_gem_object *obj,
 				 struct drm_i915_gem_request *req,
-				 uint32_t flags)
+				 uint64_t gtt_offset)
 {
 	struct intel_engine_cs *engine = req->engine;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
@@ -11189,7 +11205,7 @@ static int intel_gen3_queue_flip(struct drm_device *dev,
 	intel_ring_emit(engine, MI_DISPLAY_FLIP_I915 |
 			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
 	intel_ring_emit(engine, fb->pitches[0]);
-	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
+	intel_ring_emit(engine, gtt_offset);
 	intel_ring_emit(engine, MI_NOOP);
 
 	return 0;
@@ -11200,7 +11216,7 @@ static int intel_gen4_queue_flip(struct drm_device *dev,
 				 struct drm_framebuffer *fb,
 				 struct drm_i915_gem_object *obj,
 				 struct drm_i915_gem_request *req,
-				 uint32_t flags)
+				 uint64_t gtt_offset)
 {
 	struct intel_engine_cs *engine = req->engine;
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -11219,8 +11235,7 @@ static int intel_gen4_queue_flip(struct drm_device *dev,
 	intel_ring_emit(engine, MI_DISPLAY_FLIP |
 			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
 	intel_ring_emit(engine, fb->pitches[0]);
-	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset |
-			obj->tiling_mode);
+	intel_ring_emit(engine, gtt_offset | obj->tiling_mode);
 
 	/* XXX Enabling the panel-fitter across page-flip is so far
 	 * untested on non-native modes, so ignore it for now.
@@ -11238,7 +11253,7 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
 				 struct drm_framebuffer *fb,
 				 struct drm_i915_gem_object *obj,
 				 struct drm_i915_gem_request *req,
-				 uint32_t flags)
+				 uint64_t gtt_offset)
 {
 	struct intel_engine_cs *engine = req->engine;
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -11253,7 +11268,7 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
 	intel_ring_emit(engine, MI_DISPLAY_FLIP |
 			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
 	intel_ring_emit(engine, fb->pitches[0] | obj->tiling_mode);
-	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
+	intel_ring_emit(engine, gtt_offset);
 
 	/* Contrary to the suggestions in the documentation,
 	 * "Enable Panel Fitter" does not seem to be required when page
@@ -11273,7 +11288,7 @@ static int intel_gen7_queue_flip(struct drm_device *dev,
 				 struct drm_framebuffer *fb,
 				 struct drm_i915_gem_object *obj,
 				 struct drm_i915_gem_request *req,
-				 uint32_t flags)
+				 uint64_t gtt_offset)
 {
 	struct intel_engine_cs *engine = req->engine;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
@@ -11356,7 +11371,7 @@ static int intel_gen7_queue_flip(struct drm_device *dev,
 
 	intel_ring_emit(engine, MI_DISPLAY_FLIP_I915 | plane_bit);
 	intel_ring_emit(engine, (fb->pitches[0] | obj->tiling_mode));
-	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
+	intel_ring_emit(engine, gtt_offset);
 	intel_ring_emit(engine, (MI_NOOP));
 
 	return 0;
@@ -11423,7 +11438,7 @@ static int intel_default_queue_flip(struct drm_device *dev,
 				    struct drm_framebuffer *fb,
 				    struct drm_i915_gem_object *obj,
 				    struct drm_i915_gem_request *req,
-				    uint32_t flags)
+				    uint64_t gtt_offset)
 {
 	return -ENODEV;
 }
@@ -11478,20 +11493,26 @@ void intel_check_page_flip(struct drm_i915_private *dev_priv, int pipe)
 		return;
 
 	spin_lock(&dev->event_lock);
-	work = intel_crtc->flip_work;
+	while (!list_empty(&intel_crtc->flip_work)) {
+		work = list_first_entry(&intel_crtc->flip_work,
+					struct intel_flip_work, head);
 
-	if (work != NULL && !is_mmio_work(work) &&
-	    __pageflip_stall_check_cs(dev_priv, intel_crtc, work)) {
-		WARN_ONCE(1,
-			  "Kicking stuck page flip: queued at %d, now %d\n",
-			work->flip_queued_vblank, intel_crtc_get_vblank_counter(intel_crtc));
-		page_flip_completed(intel_crtc);
-		work = NULL;
-	}
+		if (is_mmio_work(work))
+			break;
+
+		if (__pageflip_stall_check_cs(dev_priv, intel_crtc, work)) {
+			WARN_ONCE(1,
+				  "Kicking stuck page flip: queued at %d, now %d\n",
+				work->flip_queued_vblank, intel_crtc_get_vblank_counter(intel_crtc));
+			page_flip_completed(intel_crtc, work);
+			continue;
+		}
 
-	if (work != NULL && !is_mmio_work(work) &&
-	    intel_crtc_get_vblank_counter(intel_crtc) - work->flip_queued_vblank > 1)
-		intel_queue_rps_boost_for_request(work->flip_queued_req);
+		if (intel_crtc_get_vblank_counter(intel_crtc) - work->flip_queued_vblank > 1)
+			intel_queue_rps_boost_for_request(work->flip_queued_req);
+
+		break;
+	}
 	spin_unlock(&dev->event_lock);
 }
 
@@ -11554,13 +11575,18 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 
 	/* We borrow the event spin lock for protecting flip_work */
 	spin_lock_irq(&dev->event_lock);
-	if (intel_crtc->flip_work) {
+	if (!list_empty(&intel_crtc->flip_work)) {
+		struct intel_flip_work *old_work;
+
+		old_work = list_last_entry(&intel_crtc->flip_work,
+					   struct intel_flip_work, head);
+
 		/* Before declaring the flip queue wedged, check if
 		 * the hardware completed the operation behind our backs.
 		 */
-		if (pageflip_finished(intel_crtc, intel_crtc->flip_work)) {
+		if (pageflip_finished(intel_crtc, old_work)) {
 			DRM_DEBUG_DRIVER("flip queue: previous flip completed, continuing\n");
-			page_flip_completed(intel_crtc);
+			page_flip_completed(intel_crtc, old_work);
 		} else {
 			DRM_DEBUG_DRIVER("flip queue: crtc already busy\n");
 			spin_unlock_irq(&dev->event_lock);
@@ -11570,7 +11596,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 			return -EBUSY;
 		}
 	}
-	intel_crtc->flip_work = work;
+	list_add_tail(&work->head, &intel_crtc->flip_work);
 	spin_unlock_irq(&dev->event_lock);
 
 	if (atomic_read(&intel_crtc->unpin_work_count) >= 2)
@@ -11652,7 +11678,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 	} else {
 		i915_gem_request_assign(&work->flip_queued_req, request);
 		ret = dev_priv->display.queue_flip(dev, crtc, fb, obj, request,
-						   page_flip_flags);
+						   work->gtt_offset);
 		if (ret)
 			goto cleanup_unpin;
 
@@ -11687,7 +11713,7 @@ cleanup:
 	drm_framebuffer_unreference(work->old_fb);
 
 	spin_lock_irq(&dev->event_lock);
-	intel_crtc->flip_work = NULL;
+	list_del(&work->head);
 	spin_unlock_irq(&dev->event_lock);
 
 	drm_crtc_vblank_put(crtc);
@@ -13701,11 +13727,15 @@ static int intel_atomic_commit(struct drm_device *dev,
 		intel_modeset_verify_crtc(crtc, old_crtc_state, crtc->state);
 
 		if (state->legacy_cursor_update &&
-		    to_intel_crtc(crtc)->flip_work) {
-			struct intel_flip_work *work;
+		    !list_empty_careful(&to_intel_crtc(crtc)->flip_work)) {
+			struct intel_flip_work *work = NULL;
+			struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
 			spin_lock_irq(&dev->event_lock);
-			work = to_intel_crtc(crtc)->flip_work;
+			if (!list_empty(&intel_crtc->flip_work))
+				work = list_last_entry(&intel_crtc->flip_work,
+						       struct intel_flip_work, head);
+
 			if (work && &work->new_crtc_state->base == old_crtc_state) {
 				state->crtcs[i] = NULL;
 				state->crtc_states[i] = NULL;
@@ -14319,6 +14349,8 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
 	intel_crtc->base.state = &crtc_state->base;
 	crtc_state->base.crtc = &intel_crtc->base;
 
+	INIT_LIST_HEAD(&intel_crtc->flip_work);
+
 	/* initialize shared scalers */
 	if (INTEL_INFO(dev)->gen >= 9) {
 		if (pipe == PIPE_C)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index ab778193bccd..6944202d3de0 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -644,7 +644,7 @@ struct intel_crtc {
 	unsigned long enabled_power_domains;
 	bool lowfreq_avail;
 	struct intel_overlay *overlay;
-	struct intel_flip_work *flip_work;
+	struct list_head flip_work;
 
 	atomic_t unpin_work_count;
 
@@ -973,6 +973,8 @@ intel_get_crtc_for_plane(struct drm_device *dev, int plane)
 }
 
 struct intel_flip_work {
+	struct list_head head;
+
 	struct work_struct unpin_work;
 	struct work_struct mmio_work;
 
-- 
2.5.5



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