drm/vboxvideo: Switch to drm_atomic_helper_dirty_fb()

The vboxvideo driver provides struct drm_framebuffer_funcs.dirty_fb from
its own implementation. Switch over to drm_atomic_helper_dirty_fb() and
handle screen updates in the primary plane's atomic_update function.

With dirty_fb out of the way, we can further replace struct vbox_frammebuffer
with generic code.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191011134808.3955-3-tzimmermann@suse.de

drivers/gpu/drm/vboxvideo/vbox_drv.h

@@ -143,10 +143,6 @@ void vbox_mode_fini(struct vbox_private *vbox);
 
 void vbox_report_caps(struct vbox_private *vbox);
 
-void vbox_framebuffer_dirty_rectangles(struct drm_framebuffer *fb,
-				       struct drm_clip_rect *rects,
-				       unsigned int num_rects);
-
 int vbox_framebuffer_init(struct vbox_private *vbox,
 			  struct vbox_framebuffer *vbox_fb,
 			  const struct drm_mode_fb_cmd2 *mode_cmd,

drivers/gpu/drm/vboxvideo/vbox_main.c

@@ -11,6 +11,7 @@
 #include <linux/vbox_err.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_damage_helper.h>
 
 #include "vbox_drv.h"
 #include "vboxvideo_guest.h"
@@ -38,67 +39,9 @@ void vbox_report_caps(struct vbox_private *vbox)
 	hgsmi_send_caps_info(vbox->guest_pool, caps);
 }
 
-/* Send information about dirty rectangles to VBVA. */
-void vbox_framebuffer_dirty_rectangles(struct drm_framebuffer *fb,
-				       struct drm_clip_rect *rects,
-				       unsigned int num_rects)
-{
-	struct vbox_private *vbox = fb->dev->dev_private;
-	struct drm_display_mode *mode;
-	struct drm_crtc *crtc;
-	int crtc_x, crtc_y;
-	unsigned int i;
-
-	mutex_lock(&vbox->hw_mutex);
-	list_for_each_entry(crtc, &fb->dev->mode_config.crtc_list, head) {
-		if (crtc->primary->state->fb != fb)
-			continue;
-
-		mode = &crtc->state->mode;
-		crtc_x = crtc->primary->state->src_x >> 16;
-		crtc_y = crtc->primary->state->src_y >> 16;
-
-		for (i = 0; i < num_rects; ++i) {
-			struct vbva_cmd_hdr cmd_hdr;
-			unsigned int crtc_id = to_vbox_crtc(crtc)->crtc_id;
-
-			if (rects[i].x1 > crtc_x + mode->hdisplay ||
-			    rects[i].y1 > crtc_y + mode->vdisplay ||
-			    rects[i].x2 < crtc_x ||
-			    rects[i].y2 < crtc_y)
-				continue;
-
-			cmd_hdr.x = (s16)rects[i].x1;
-			cmd_hdr.y = (s16)rects[i].y1;
-			cmd_hdr.w = (u16)rects[i].x2 - rects[i].x1;
-			cmd_hdr.h = (u16)rects[i].y2 - rects[i].y1;
-
-			if (!vbva_buffer_begin_update(&vbox->vbva_info[crtc_id],
-						      vbox->guest_pool))
-				continue;
-
-			vbva_write(&vbox->vbva_info[crtc_id], vbox->guest_pool,
-				   &cmd_hdr, sizeof(cmd_hdr));
-			vbva_buffer_end_update(&vbox->vbva_info[crtc_id]);
-		}
-	}
-	mutex_unlock(&vbox->hw_mutex);
-}
-
-static int vbox_user_framebuffer_dirty(struct drm_framebuffer *fb,
-				       struct drm_file *file_priv,
-				       unsigned int flags, unsigned int color,
-				       struct drm_clip_rect *rects,
-				       unsigned int num_rects)
-{
-	vbox_framebuffer_dirty_rectangles(fb, rects, num_rects);
-
-	return 0;
-}
-
 static const struct drm_framebuffer_funcs vbox_fb_funcs = {
 	.destroy = vbox_user_framebuffer_destroy,
-	.dirty = vbox_user_framebuffer_dirty,
+	.dirty = drm_atomic_helper_dirtyfb,
 };
 
 int vbox_framebuffer_init(struct vbox_private *vbox,

drivers/gpu/drm/vboxvideo/vbox_mode.c

@@ -284,10 +284,43 @@ static void vbox_primary_atomic_update(struct drm_plane *plane,
 {
 	struct drm_crtc *crtc = plane->state->crtc;
 	struct drm_framebuffer *fb = plane->state->fb;
+	struct vbox_private *vbox = fb->dev->dev_private;
+	struct drm_mode_rect *clips;
+	uint32_t num_clips, i;
 
 	vbox_crtc_set_base_and_mode(crtc, fb,
 				    plane->state->src_x >> 16,
 				    plane->state->src_y >> 16);
+
+	/* Send information about dirty rectangles to VBVA. */
+
+	clips = drm_plane_get_damage_clips(plane->state);
+	num_clips = drm_plane_get_damage_clips_count(plane->state);
+
+	if (!num_clips)
+		return;
+
+	mutex_lock(&vbox->hw_mutex);
+
+	for (i = 0; i < num_clips; ++i, ++clips) {
+		struct vbva_cmd_hdr cmd_hdr;
+		unsigned int crtc_id = to_vbox_crtc(crtc)->crtc_id;
+
+		cmd_hdr.x = (s16)clips->x1;
+		cmd_hdr.y = (s16)clips->y1;
+		cmd_hdr.w = (u16)clips->x2 - clips->x1;
+		cmd_hdr.h = (u16)clips->y2 - clips->y1;
+
+		if (!vbva_buffer_begin_update(&vbox->vbva_info[crtc_id],
+					      vbox->guest_pool))
+			continue;
+
+		vbva_write(&vbox->vbva_info[crtc_id], vbox->guest_pool,
+			   &cmd_hdr, sizeof(cmd_hdr));
+		vbva_buffer_end_update(&vbox->vbva_info[crtc_id]);
+	}
+
+	mutex_unlock(&vbox->hw_mutex);
 }
 
 static void vbox_primary_atomic_disable(struct drm_plane *plane,