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Add wlr_compositor_dmabuf_waiter

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This helper monitors buffers for implicit and explicit work
synchronization, delaying the surface commit until the fences are ready
to be consumed for synchronization (i.e., fences have materialized), or
for the work to be complete, depending on the specified waiter mode.

Through this, the compositor can avoid stalling on incomplete work,
staying fully interactive until the buffer is ready to be sampled.

This is a generalization of Simon's patch that added a waiter for
traditional implicit sync.

Based-on-patch-by: Simon Ser <contact@emersion.fr>
This commit is contained in:
Kenny Levinsen 2026-04-01 14:32:08 +00:00
parent c66a910753
commit b84aadb5c1
4 changed files with 427 additions and 22 deletions
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45
render/drm_syncobj.c
View file

@ -185,6 +185,31 @@ bool wlr_drm_syncobj_timeline_signal(struct wlr_drm_syncobj_timeline *timeline,
return true;
}
int wlr_drm_syncobj_timeline_eventfd(struct wlr_drm_syncobj_timeline *timeline,
uint64_t point, uint32_t flags) {
int ev_fd;
#if HAVE_EVENTFD
ev_fd = eventfd(0, EFD_CLOEXEC);
if (ev_fd < 0) {
wlr_log_errno(WLR_ERROR, "eventfd() failed");
}
#else
ev_fd = -1;
wlr_log(WLR_ERROR, "eventfd() is unavailable");
#endif
if (ev_fd < 0) {
return -1;
}
if (drmSyncobjEventfd(timeline->drm_fd, timeline->handle, point, ev_fd, flags) != 0) {
wlr_log_errno(WLR_ERROR, "drmSyncobjEventfd() failed");
close(ev_fd);
return -1;
}
return ev_fd;
}
static int handle_eventfd_ready(int ev_fd, uint32_t mask, void *data) {
struct wlr_drm_syncobj_timeline_waiter *waiter = data;
@ -208,27 +233,13 @@ bool wlr_drm_syncobj_timeline_waiter_init(struct wlr_drm_syncobj_timeline_waiter
struct wl_event_loop *loop, wlr_drm_syncobj_timeline_ready_callback callback) {
assert(callback);
int ev_fd;
#if HAVE_EVENTFD
ev_fd = eventfd(0, EFD_CLOEXEC);
if (ev_fd < 0) {
wlr_log_errno(WLR_ERROR, "eventfd() failed");
}
#else
ev_fd = -1;
wlr_log(WLR_ERROR, "eventfd() is unavailable");
#endif
int ev_fd = wlr_drm_syncobj_timeline_eventfd(timeline, point, flags);
if (ev_fd < 0) {
return false;
}
if (drmSyncobjEventfd(timeline->drm_fd, timeline->handle, point, ev_fd, flags) != 0) {
wlr_log_errno(WLR_ERROR, "drmSyncobjEventfd() failed");
close(ev_fd);
return false;
}
struct wl_event_source *source = wl_event_loop_add_fd(loop, ev_fd, WL_EVENT_READABLE, handle_eventfd_ready, waiter);
struct wl_event_source *source = wl_event_loop_add_fd(loop, ev_fd,
WL_EVENT_READABLE, handle_eventfd_ready, waiter);
if (source == NULL) {
wlr_log(WLR_ERROR, "Failed to add FD to event loop");
close(ev_fd);