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backend/drm: skip reset after VT switch if possible
If all connectors and planes already have the right CRTC set, or are disabled, we can skip the device-wide reset after a VT switch. I've contemplated using a more fine-grained logic to only reset the connectors, CRTCs and planes that need to be migrated. However, writing a correct algorithm for this would be quite involved, and it doesn't seem worth the trouble anyways. Closes: https://github.com/swaywm/sway/issues/7956
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1 changed files with 63 additions and 1 deletions
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@ -1738,6 +1738,68 @@ static void build_current_connector_state(struct wlr_output_state *state,
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}
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}
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/**
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* Check whether we need to perform a full reset after a VT switch.
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*
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* If any connector or plane has a different CRTC, we need to perform a full
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* reset to restore our mapping. We couldn't avoid a full reset even if we
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* used a single KMS atomic commit to apply our state: the kernel rejects
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* commits which migrate a plane from one CRTC to another without going through
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* an intermediate state where the plane is disabled.
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*/
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static bool skip_reset_for_restore(struct wlr_drm_backend *drm) {
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struct wlr_drm_connector *conn;
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wl_list_for_each(conn, &drm->connectors, link) {
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drmModeConnector *drm_conn = drmModeGetConnectorCurrent(drm->fd, conn->id);
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if (drm_conn == NULL) {
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return false;
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}
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struct wlr_drm_crtc *crtc = connector_get_current_crtc(conn, drm_conn);
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drmModeFreeConnector(drm_conn);
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if (crtc != NULL && conn->crtc != crtc) {
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return false;
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}
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}
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for (size_t i = 0; i < drm->num_planes; i++) {
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struct wlr_drm_plane *plane = &drm->planes[i];
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drmModePlane *drm_plane = drmModeGetPlane(drm->fd, plane->id);
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if (drm_plane == NULL) {
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return false;
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}
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uint32_t crtc_id = drm_plane->crtc_id;
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drmModeFreePlane(drm_plane);
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struct wlr_drm_crtc *crtc = NULL;
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for (size_t i = 0; i < drm->num_crtcs; i++) {
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if (drm->crtcs[i].id == crtc_id) {
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crtc = &drm->crtcs[i];
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break;
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}
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}
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if (crtc == NULL) {
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continue;
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}
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bool ok = false;
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switch (plane->type) {
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case DRM_PLANE_TYPE_PRIMARY:
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ok = crtc->primary == plane;
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break;
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case DRM_PLANE_TYPE_CURSOR:
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ok = crtc->cursor == plane;
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break;
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}
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if (!ok) {
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return false;
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}
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}
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return true;
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}
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void restore_drm_device(struct wlr_drm_backend *drm) {
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// The previous DRM master leaves KMS in an undefined state. We need
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// to restore our own state, but be careful to avoid invalid
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@ -1745,7 +1807,7 @@ void restore_drm_device(struct wlr_drm_backend *drm) {
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// first disable all CRTCs, then light up the ones we were using
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// before the VT switch.
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// TODO: better use the atomic API to improve restoration after a VT switch
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if (!drm->iface->reset(drm)) {
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if (!skip_reset_for_restore(drm) && !drm->iface->reset(drm)) {
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wlr_log(WLR_ERROR, "Failed to reset state after VT switch");
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}
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