3 files changed, 67 insertions, 23 deletions

diff --git a/drivers/gpu/drm/vkms/vkms_crc.c b/drivers/gpu/drm/vkms/vkms_crc.c
index 52964178acb4..c860a92cf142 100644
--- a/drivers/gpu/drm/vkms/vkms_crc.c
+++ b/drivers/gpu/drm/vkms/vkms_crc.c
@@ -159,11 +159,8 @@ void vkms_crc_work_handle(struct work_struct *work)
 						crc_work);
 	struct drm_crtc *crtc = crtc_state->base.crtc;
 	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
-	struct vkms_device *vdev = container_of(out, struct vkms_device,
-						output);
 	struct vkms_crc_data *primary_crc = NULL;
 	struct vkms_crc_data *cursor_crc = NULL;
-	struct drm_plane *plane;
 	u32 crc32 = 0;
 	u64 frame_start, frame_end;
 	bool crc_pending;
@@ -184,21 +181,11 @@ void vkms_crc_work_handle(struct work_struct *work)
 	if (!crc_pending)
 		return;
 
-	drm_for_each_plane(plane, &vdev->drm) {
-		struct vkms_plane_state *vplane_state;
-		struct vkms_crc_data *crc_data;
+	if (crtc_state->num_active_planes >= 1)
+		primary_crc = crtc_state->active_planes[0]->crc_data;
 
-		vplane_state = to_vkms_plane_state(plane->state);
-		crc_data = vplane_state->crc_data;
-
-		if (drm_framebuffer_read_refcount(&crc_data->fb) == 0)
-			continue;
-
-		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
-			primary_crc = crc_data;
-		else
-			cursor_crc = crc_data;
-	}
+	if (crtc_state->num_active_planes == 2)
+		cursor_crc = crtc_state->active_planes[1]->crc_data;
 
 	if (primary_crc)
 		crc32 = _vkms_get_crc(primary_crc, cursor_crc);
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index d3d95b1e7292..7e2a081f3764 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 
 #include "vkms_drv.h"
+#include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_probe_helper.h>
 
@@ -9,7 +10,7 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
 	struct vkms_output *output = container_of(timer, struct vkms_output,
 						  vblank_hrtimer);
 	struct drm_crtc *crtc = &output->crtc;
-	struct vkms_crtc_state *state = to_vkms_crtc_state(crtc->state);
+	struct vkms_crtc_state *state;
 	u64 ret_overrun;
 	bool ret;
 
@@ -23,6 +24,7 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
 	if (!ret)
 		DRM_ERROR("vkms failure on handling vblank");
 
+	state = output->crc_state;
 	if (state && output->crc_enabled) {
 		u64 frame = drm_crtc_accurate_vblank_count(crtc);
 
@@ -124,10 +126,9 @@ static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc,
 
 	__drm_atomic_helper_crtc_destroy_state(state);
 
-	if (vkms_state) {
-		WARN_ON(work_pending(&vkms_state->crc_work));
-		kfree(vkms_state);
-	}
+	WARN_ON(work_pending(&vkms_state->crc_work));
+	kfree(vkms_state->active_planes);
+	kfree(vkms_state);
 }
 
 static void vkms_atomic_crtc_reset(struct drm_crtc *crtc)
@@ -157,6 +158,52 @@ static const struct drm_crtc_funcs vkms_crtc_funcs = {
 	.verify_crc_source	= vkms_verify_crc_source,
 };
 
+static int vkms_crtc_atomic_check(struct drm_crtc *crtc,
+				  struct drm_crtc_state *state)
+{
+	struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);
+	struct drm_plane *plane;
+	struct drm_plane_state *plane_state;
+	int i = 0, ret;
+
+	if (vkms_state->active_planes)
+		return 0;
+
+	ret = drm_atomic_add_affected_planes(state->state, crtc);
+	if (ret < 0)
+		return ret;
+
+	drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) {
+		plane_state = drm_atomic_get_existing_plane_state(state->state,
+								  plane);
+		WARN_ON(!plane_state);
+
+		if (!plane_state->visible)
+			continue;
+
+		i++;
+	}
+
+	vkms_state->active_planes = kcalloc(i, sizeof(plane), GFP_KERNEL);
+	if (!vkms_state->active_planes)
+		return -ENOMEM;
+	vkms_state->num_active_planes = i;
+
+	i = 0;
+	drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) {
+		plane_state = drm_atomic_get_existing_plane_state(state->state,
+								  plane);
+
+		if (!plane_state->visible)
+			continue;
+
+		vkms_state->active_planes[i++] =
+			to_vkms_plane_state(plane_state);
+	}
+
+	return 0;
+}
+
 static void vkms_crtc_atomic_enable(struct drm_crtc *crtc,
 				    struct drm_crtc_state *old_state)
 {
@@ -198,10 +245,13 @@ static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
 		crtc->state->event = NULL;
 	}
 
+	vkms_output->crc_state = to_vkms_crtc_state(crtc->state);
+
 	spin_unlock_irq(&vkms_output->lock);
 }
 
 static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
+	.atomic_check	= vkms_crtc_atomic_check,
 	.atomic_begin	= vkms_crtc_atomic_begin,
 	.atomic_flush	= vkms_crtc_atomic_flush,
 	.atomic_enable	= vkms_crtc_atomic_enable,
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 98af63c9e5db..12b4db7ac641 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -49,6 +49,10 @@ struct vkms_crtc_state {
 	struct drm_crtc_state base;
 	struct work_struct crc_work;
 
+	int num_active_planes;
+	/* stack of active planes for crc computation, should be in z order */
+	struct vkms_plane_state **active_planes;
+
 	/* below three are protected by vkms_output.crc_lock */
 	bool crc_pending;
 	u64 frame_start;
@@ -62,12 +66,15 @@ struct vkms_output {
 	struct hrtimer vblank_hrtimer;
 	ktime_t period_ns;
 	struct drm_pending_vblank_event *event;
-	bool crc_enabled;
 	/* ordered wq for crc_work */
 	struct workqueue_struct *crc_workq;
 	/* protects concurrent access to crc_data */
 	spinlock_t lock;
 
+	/* protected by @lock */
+	bool crc_enabled;
+	struct vkms_crtc_state *crc_state;
+
 	spinlock_t crc_lock;
 };