1 files changed, 52 insertions, 0 deletions
diff --git a/src/drm/drm_fence.h b/src/drm/drm_fence.h
new file mode 100644
index 00000000..99cada4e
--- /dev/null
+++ b/src/drm/drm_fence.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2022 Google LLC
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef DRM_FENCE_H_
+#define DRM_FENCE_H_
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "c11/threads.h"
+#include "util/list.h"
+
+/*
+ * Helpers to deal with managing dma-fence fd's.  This should something that
+ * can be re-used by any virtgpu native context implementation.
+ */
+
+struct drm_fence;
+struct virgl_context;
+
+/**
+ * Represents a single timeline of fence-fd's.  Fences on a timeline are
+ * signaled in FIFO order.
+ */
+struct drm_timeline {
+   struct virgl_context *vctx;
+   const char *name;
+   int eventfd;
+   int ring_idx;
+
+   int last_fence_fd;
+   struct list_head pending_fences;
+
+   mtx_t fence_mutex;
+   cnd_t fence_cond;
+   thrd_t sync_thread;
+   bool stop_sync_thread;
+};
+
+void drm_timeline_init(struct drm_timeline *timeline, struct virgl_context *vctx,
+                       const char *name, int eventfd, int ring_idx);
+
+void drm_timeline_fini(struct drm_timeline *timeline);
+
+int drm_timeline_submit_fence(struct drm_timeline *timeline, uint32_t flags,
+                              uint64_t fence_id);
+
+void drm_timeline_set_last_fence_fd(struct drm_timeline *timeline, int fd);
+
+#endif /* DRM_FENCE_H_ */