backend/drm: remove wlr_drm_interface.crtc_move_cursor

Instead, make the legacy backend call drmModeMoveCursor on page-flip.

backend/drm/atomic.c

@@ -193,12 +193,6 @@ static bool atomic_crtc_set_cursor(struct wlr_drm_backend *drm,
 	return true;
 }
 
-static bool atomic_crtc_move_cursor(struct wlr_drm_backend *drm,
-		struct wlr_drm_crtc *crtc, int x, int y) {
-	/* Cursor updates happen when we pageflip */
-	return true;
-}
-
 static bool atomic_crtc_set_gamma(struct wlr_drm_backend *drm,
 		struct wlr_drm_crtc *crtc, size_t size,
 		uint16_t *r, uint16_t *g, uint16_t *b) {
@@ -258,7 +252,6 @@ const struct wlr_drm_interface atomic_iface = {
 	.conn_enable = atomic_conn_enable,
 	.crtc_pageflip = atomic_crtc_pageflip,
 	.crtc_set_cursor = atomic_crtc_set_cursor,
-	.crtc_move_cursor = atomic_crtc_move_cursor,
 	.crtc_set_gamma = atomic_crtc_set_gamma,
 	.crtc_get_gamma_size = atomic_crtc_get_gamma_size,
 };

backend/drm/backend.c

@@ -112,8 +112,6 @@ static void session_signal(struct wl_listener *listener, void *data) {
 			}
 
 			drm->iface->crtc_set_cursor(drm, conn->crtc, bo);
-			drm->iface->crtc_move_cursor(drm, conn->crtc, conn->cursor_x,
-				conn->cursor_y);
 
 			if (conn->crtc->gamma_table != NULL) {
 				size_t size = conn->crtc->gamma_table_size;

backend/drm/drm.c

@@ -953,11 +953,6 @@ static bool drm_connector_set_cursor(struct wlr_output *output,
 		plane->cursor_hotspot_x = hotspot.x;
 		plane->cursor_hotspot_y = hotspot.y;
 
-		if (!drm->iface->crtc_move_cursor(drm, conn->crtc, conn->cursor_x,
-				conn->cursor_y)) {
-			return false;
-		}
-
 		wlr_output_update_needs_frame(output);
 	}
 
@@ -1033,7 +1028,6 @@ static bool drm_connector_set_cursor(struct wlr_output *output,
 static bool drm_connector_move_cursor(struct wlr_output *output,
 		int x, int y) {
 	struct wlr_drm_connector *conn = get_drm_connector_from_output(output);
-	struct wlr_drm_backend *drm = get_drm_backend_from_backend(output->backend);
 	if (!conn->crtc) {
 		return false;
 	}
@@ -1056,15 +1050,8 @@ static bool drm_connector_move_cursor(struct wlr_output *output,
 	conn->cursor_x = box.x;
 	conn->cursor_y = box.y;
 
-	if (!drm->session->active) {
-		return true; // will be committed when session is resumed
-	}
-
-	bool ok = drm->iface->crtc_move_cursor(drm, conn->crtc, box.x, box.y);
-	if (ok) {
-		wlr_output_update_needs_frame(output);
-	}
-	return ok;
+	wlr_output_update_needs_frame(output);
+	return true;
 }
 
 static void drm_connector_destroy(struct wlr_output *output) {

backend/drm/legacy.c

@@ -9,6 +9,8 @@
 static bool legacy_crtc_pageflip(struct wlr_drm_backend *drm,
 		struct wlr_drm_connector *conn, drmModeModeInfo *mode) {
 	struct wlr_drm_crtc *crtc = conn->crtc;
+	struct wlr_drm_plane *cursor = crtc->cursor;
+
 	struct wlr_drm_fb *fb = plane_get_next_fb(crtc->primary);
 	struct gbm_bo *bo = drm_fb_acquire(fb, drm, &crtc->primary->mgpu_surf);
 	if (!bo) {
@@ -28,6 +30,12 @@ static bool legacy_crtc_pageflip(struct wlr_drm_backend *drm,
 		}
 	}
 
+	if (cursor != NULL && cursor->cursor_enabled && drmModeMoveCursor(drm->fd,
+			crtc->id, conn->cursor_x, conn->cursor_y) != 0) {
+		wlr_log_errno(WLR_ERROR, "%s: failed to move cursor", conn->output.name);
+		return false;
+	}
+
 	if (drmModePageFlip(drm->fd, crtc->id, fb_id, DRM_MODE_PAGE_FLIP_EVENT, drm)) {
 		wlr_log_errno(WLR_ERROR, "%s: Failed to page flip", conn->output.name);
 		return false;
@@ -75,11 +83,6 @@ bool legacy_crtc_set_cursor(struct wlr_drm_backend *drm,
 	return true;
 }
 
-bool legacy_crtc_move_cursor(struct wlr_drm_backend *drm,
-		struct wlr_drm_crtc *crtc, int x, int y) {
-	return !drmModeMoveCursor(drm->fd, crtc->id, x, y);
-}
-
 static bool legacy_crtc_set_gamma(struct wlr_drm_backend *drm,
 		struct wlr_drm_crtc *crtc, size_t size,
 		uint16_t *r, uint16_t *g, uint16_t *b) {
@@ -95,7 +98,6 @@ const struct wlr_drm_interface legacy_iface = {
 	.conn_enable = legacy_conn_enable,
 	.crtc_pageflip = legacy_crtc_pageflip,
 	.crtc_set_cursor = legacy_crtc_set_cursor,
-	.crtc_move_cursor = legacy_crtc_move_cursor,
 	.crtc_set_gamma = legacy_crtc_set_gamma,
 	.crtc_get_gamma_size = legacy_crtc_get_gamma_size,
 };

include/backend/drm/iface.h

@@ -22,9 +22,6 @@ struct wlr_drm_interface {
 	// Enable the cursor buffer on crtc. Set bo to NULL to disable
 	bool (*crtc_set_cursor)(struct wlr_drm_backend *drm,
 		struct wlr_drm_crtc *crtc, struct gbm_bo *bo);
-	// Move the cursor on crtc
-	bool (*crtc_move_cursor)(struct wlr_drm_backend *drm,
-		struct wlr_drm_crtc *crtc, int x, int y);
 	// Set the gamma lut on crtc
 	bool (*crtc_set_gamma)(struct wlr_drm_backend *drm,
 		struct wlr_drm_crtc *crtc, size_t size,