Merge branch 'syncobj_interop' into 'master'

linux_drm_syncobj_v1: add _state_add_release_from_implicit_sync()

See merge request wlroots/wlroots!5308

include/render/drm_syncobj_merger.h

@@ -3,6 +3,8 @@
 
 #include <wayland-server-core.h>
 
+struct wlr_buffer;
+
 /**
  * Accumulate timeline points, to have a destination timeline point be
  * signalled when all inputs are
@@ -41,4 +43,22 @@ bool wlr_drm_syncobj_merger_add(struct wlr_drm_syncobj_merger *merger,
 	struct wlr_drm_syncobj_timeline *dst_timeline, uint64_t dst_point,
 	struct wl_event_loop *loop);
 
+/**
+ * Add a new sync file to wait for.
+ *
+ * Ownership of fd is transferred to the merger.
+ */
+bool wlr_drm_syncobj_merger_add_sync_file(struct wlr_drm_syncobj_merger *merger,
+	int fd);
+
+/**
+ * Add a new DMA-BUF release to wait for.
+ *
+ * Waits for write access.
+ * If the platform does not support DMA-BUF<->sync file interop, the supplied
+ * event_loop is used to schedule a wait.
+ */
+bool wlr_drm_syncobj_merger_add_dmabuf(struct wlr_drm_syncobj_merger *merger,
+	struct wlr_buffer *buffer, struct wl_event_loop *event_loop);
+
 #endif

include/wlr/types/wlr_linux_drm_syncobj_v1.h

@@ -74,4 +74,21 @@ bool wlr_linux_drm_syncobj_v1_state_add_release_point(
 	struct wlr_drm_syncobj_timeline *release_timeline, uint64_t release_point,
 	struct wl_event_loop *event_loop);
 
+/**
+ * Register the DMA-BUF release of a buffer for buffer usage.
+ * Non-dmabuf buffers are considered to be immediately available (no wait).
+ *
+ * This function may be called multiple times for the same commit. The client's
+ * release point will be signalled when all registered points are signalled, and
+ * a new buffer has been committed.
+ *
+ * Because the platform may not support DMA-BUF fence merges, a wl_event_loop
+ * must be supplied to schedule a wait internally, if needed
+ *
+ * Waits for write access
+ */
+bool wlr_linux_drm_syncobj_v1_state_add_release_from_implicit_sync(
+	struct wlr_linux_drm_syncobj_surface_v1_state *state,
+	struct wlr_buffer *buffer, struct wl_event_loop *event_loop);
+
 #endif

render/drm_syncobj_merger.c

@@ -4,8 +4,10 @@
 #include <unistd.h>
 #include <wayland-util.h>
 #include <wlr/render/drm_syncobj.h>
+#include <wlr/types/wlr_buffer.h>
 #include <wlr/util/log.h>
 #include <xf86drm.h>
+#include "render/dmabuf.h"
 #include "render/drm_syncobj_merger.h"
 
 #include "config.h"
@@ -79,14 +81,7 @@ void wlr_drm_syncobj_merger_unref(struct wlr_drm_syncobj_merger *merger) {
 static bool merger_add_exportable(struct wlr_drm_syncobj_merger *merger,
 		struct wlr_drm_syncobj_timeline *src_timeline, uint64_t src_point) {
 	int new_sync = wlr_drm_syncobj_timeline_export_sync_file(src_timeline, src_point);
-	if (merger->sync_fd != -1) {
-		int fd2 = new_sync;
-		new_sync = sync_file_merge(merger->sync_fd, fd2);
-		close(fd2);
-		close(merger->sync_fd);
-	}
-	merger->sync_fd = new_sync;
-	return true;
+	return wlr_drm_syncobj_merger_add_sync_file(merger, new_sync);
 }
 
 struct export_waiter {
@@ -131,3 +126,69 @@ bool wlr_drm_syncobj_merger_add(struct wlr_drm_syncobj_merger *merger,
 	merger->n_ref++;
 	return true;
 }
+
+bool wlr_drm_syncobj_merger_add_sync_file(struct wlr_drm_syncobj_merger *merger,
+		int fd) {
+	int new_sync = fd;
+	if (merger->sync_fd != -1) {
+		new_sync = sync_file_merge(merger->sync_fd, fd);
+		close(fd);
+		close(merger->sync_fd);
+	}
+	merger->sync_fd = new_sync;
+	return merger->sync_fd != -1;
+}
+
+struct poll_waiter {
+	struct wl_event_source *event_source;
+	struct wlr_drm_syncobj_merger *merger;
+};
+
+static int poll_waiter_handle_done(int fd, uint32_t mask, void *data) {
+	struct poll_waiter *waiter = data;
+	wlr_drm_syncobj_merger_unref(waiter->merger);
+	wl_event_source_remove(waiter->event_source);
+	free(waiter);
+	return 0;
+}
+
+bool wlr_drm_syncobj_merger_add_dmabuf(struct wlr_drm_syncobj_merger *merger,
+		struct wlr_buffer *buffer, struct wl_event_loop *event_loop) {
+	struct wlr_dmabuf_attributes dmabuf_attributes;
+	if (!wlr_buffer_get_dmabuf(buffer, &dmabuf_attributes)) {
+		return true;
+	}
+
+	bool res = true;
+	for (int i = 0; i < dmabuf_attributes.n_planes; ++i) {
+		int sync_fd = dmabuf_export_sync_file(dmabuf_attributes.fd[i], DMA_BUF_SYNC_WRITE);
+		if (sync_fd == -1) {
+			res = false;
+			break;
+		}
+		if (!wlr_drm_syncobj_merger_add_sync_file(merger, sync_fd)) {
+			return false;
+		}
+	}
+
+	if (res) {
+		return true;
+	}
+
+	uint32_t mask = WL_EVENT_ERROR | WL_EVENT_HANGUP | WL_EVENT_WRITABLE;
+	for (int i = 0; i < dmabuf_attributes.n_planes; ++i) {
+		struct poll_waiter *waiter = calloc(1, sizeof(*waiter));
+		if (waiter == NULL) {
+			return false;
+		}
+		waiter->merger = wlr_drm_syncobj_merger_ref(merger);
+		waiter->event_source = wl_event_loop_add_fd(event_loop,
+			dmabuf_attributes.fd[i], mask, poll_waiter_handle_done, waiter);
+		if (waiter->event_source == NULL) {
+			wlr_drm_syncobj_merger_unref(waiter->merger);
+			free(waiter);
+			return false;
+		}
+	}
+	return true;
+}

types/wlr_linux_drm_syncobj_v1.c

@@ -12,6 +12,7 @@
 #include <xf86drm.h>
 #include "config.h"
 #include "linux-drm-syncobj-v1-protocol.h"
+#include "render/dmabuf.h"
 #include "render/drm_syncobj_merger.h"
 
 #define LINUX_DRM_SYNCOBJ_V1_VERSION 1
@@ -540,3 +541,12 @@ bool wlr_linux_drm_syncobj_v1_state_add_release_point(
 	return wlr_drm_syncobj_merger_add(state->release_merger,
 		release_timeline, release_point, event_loop);
 }
+
+bool wlr_linux_drm_syncobj_v1_state_add_release_from_implicit_sync(
+		struct wlr_linux_drm_syncobj_surface_v1_state *state,
+		struct wlr_buffer *buffer, struct wl_event_loop *event_loop) {
+	if (state->release_merger != NULL) {
+		return true;
+	}
+	return wlr_drm_syncobj_merger_add_dmabuf(state->release_merger, buffer, event_loop);
+}