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backend/drm: stash pending page-flip CRTC

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wlr_drm_connector.crtc may be updated by the DRM backend while a
page-flip is pending. In this case, the page-flip handler won't be able
to find the right wlr_drm_connector from the CRTC ID.

Save the CRTC when performing a page-flip to ensure we always find the
right connector when we get the event.
This commit is contained in:
Simon Ser 2020-12-25 11:12:21 +01:00
parent 576ff57db0
commit adfb7cd35a
2 changed files with 18 additions and 14 deletions
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27
backend/drm/drm.c
View file

@ -353,12 +353,13 @@ static bool drm_crtc_commit(struct wlr_drm_connector *conn, uint32_t flags) {
static bool drm_crtc_page_flip(struct wlr_drm_connector *conn) { static bool drm_crtc_page_flip(struct wlr_drm_connector *conn) {
struct wlr_drm_crtc *crtc = conn->crtc; struct wlr_drm_crtc *crtc = conn->crtc;
assert(crtc != NULL);
// wlr_drm_interface.crtc_commit will perform either a non-blocking // wlr_drm_interface.crtc_commit will perform either a non-blocking
// page-flip, either a blocking modeset. When performing a blocking modeset // page-flip, either a blocking modeset. When performing a blocking modeset
// we'll wait for all queued page-flips to complete, so we don't need this // we'll wait for all queued page-flips to complete, so we don't need this
// safeguard. // safeguard.
if (conn->pageflip_pending && !crtc->pending_modeset) { if (conn->pending_page_flip_crtc && !crtc->pending_modeset) {
wlr_drm_conn_log(conn, WLR_ERROR, "Failed to page-flip output: " wlr_drm_conn_log(conn, WLR_ERROR, "Failed to page-flip output: "
"a page-flip is already pending"); "a page-flip is already pending");
return false; return false;
@ -370,7 +371,7 @@ static bool drm_crtc_page_flip(struct wlr_drm_connector *conn) {
return false; return false;
} }
conn->pageflip_pending = true; conn->pending_page_flip_crtc = crtc->id;
// wlr_output's API guarantees that submitting a buffer will schedule a // wlr_output's API guarantees that submitting a buffer will schedule a
// frame event. However the DRM backend will also schedule a frame event // frame event. However the DRM backend will also schedule a frame event
@ -1017,7 +1018,7 @@ static void drm_connector_destroy_output(struct wlr_output *output) {
conn->desired_enabled = false; conn->desired_enabled = false;
conn->desired_mode = NULL; conn->desired_mode = NULL;
conn->possible_crtcs = 0; conn->possible_crtcs = 0;
conn->pageflip_pending = false; conn->pending_page_flip_crtc = 0;
struct wlr_drm_mode *mode, *mode_tmp; struct wlr_drm_mode *mode, *mode_tmp;
wl_list_for_each_safe(mode, mode_tmp, &conn->output.modes, wlr_mode.link) { wl_list_for_each_safe(mode, mode_tmp, &conn->output.modes, wlr_mode.link) {
@ -1443,22 +1444,24 @@ static void page_flip_handler(int fd, unsigned seq,
unsigned tv_sec, unsigned tv_usec, unsigned crtc_id, void *data) { unsigned tv_sec, unsigned tv_usec, unsigned crtc_id, void *data) {
struct wlr_drm_backend *drm = data; struct wlr_drm_backend *drm = data;
struct wlr_drm_connector *conn = NULL; bool found = false;
struct wlr_drm_connector *search; struct wlr_drm_connector *conn;
wl_list_for_each(search, &drm->outputs, link) { wl_list_for_each(conn, &drm->outputs, link) {
if (search->crtc && search->crtc->id == crtc_id) { if (conn->pending_page_flip_crtc == crtc_id) {
conn = search; found = true;
break; break;
} }
} }
if (!conn) { if (!found) {
wlr_log(WLR_DEBUG, "No connector for CRTC %u", crtc_id); wlr_log(WLR_DEBUG, "Unexpected page-flip event for CRTC %u", crtc_id);
return; return;
} }
conn->pageflip_pending = false; conn->pending_page_flip_crtc = 0;
if (conn->state != WLR_DRM_CONN_CONNECTED || conn->crtc == NULL) { if (conn->state != WLR_DRM_CONN_CONNECTED || conn->crtc == NULL) {
wlr_drm_conn_log(conn, WLR_DEBUG,
"Ignoring page-flip event for disabled connector");
return; return;
} }
@ -1529,7 +1532,7 @@ void restore_drm_outputs(struct wlr_drm_backend *drm) {
size_t i = 0; size_t i = 0;
struct wlr_drm_connector *conn; struct wlr_drm_connector *conn;
wl_list_for_each(conn, &drm->outputs, link) { wl_list_for_each(conn, &drm->outputs, link) {
if (conn->state != WLR_DRM_CONN_CLEANUP || !conn->pageflip_pending) { if (conn->state != WLR_DRM_CONN_CLEANUP || !conn->pending_page_flip_crtc) {
to_close &= ~(UINT64_C(1) << i); to_close &= ~(UINT64_C(1) << i);
} }
i++; i++;

5
include/backend/drm/drm.h
View file

@ -129,13 +129,14 @@ struct wlr_drm_connector {
struct wl_list link; struct wl_list link;
/* /* CRTC ID if a page-flip is pending, zero otherwise.
*
* We've asked for a state change in the kernel, and yet to receive a * We've asked for a state change in the kernel, and yet to receive a
* notification for its completion. Currently, the kernel only has a * notification for its completion. Currently, the kernel only has a
* queue length of 1, and no way to modify your submissions after * queue length of 1, and no way to modify your submissions after
* they're sent. * they're sent.
*/ */
bool pageflip_pending; uint32_t pending_page_flip_crtc;
}; };
struct wlr_drm_backend *get_drm_backend_from_backend( struct wlr_drm_backend *get_drm_backend_from_backend(