freedreno: native fence fd support

Signed-off-by: Rob Clark <robdclark@gmail.com>

src/gallium/drivers/freedreno/freedreno_batch.c

@@ -60,6 +60,8 @@ batch_init(struct fd_batch *batch)
 	fd_ringbuffer_set_parent(batch->draw, batch->gmem);
 	fd_ringbuffer_set_parent(batch->binning, batch->gmem);
 
+	batch->in_fence_fd = -1;
+
 	batch->cleared = batch->partial_cleared = 0;
 	batch->restore = batch->resolve = 0;
 	batch->needs_flush = false;
@@ -109,6 +111,9 @@ batch_fini(struct fd_batch *batch)
 {
 	pipe_resource_reference(&batch->query_buf, NULL);
 
+	if (batch->in_fence_fd != -1)
+		close(batch->in_fence_fd);
+
 	fd_ringbuffer_del(batch->draw);
 	fd_ringbuffer_del(batch->binning);
 	fd_ringbuffer_del(batch->gmem);

src/gallium/drivers/freedreno/freedreno_batch.h

@@ -68,6 +68,9 @@ struct fd_batch {
 	unsigned seqno;
 	unsigned idx;
 
+	int in_fence_fd;
+	bool needs_out_fence_fd;
+
 	struct fd_context *ctx;
 
 	struct util_queue_fence flush_fence;

src/gallium/drivers/freedreno/freedreno_context.c

@@ -44,6 +44,9 @@ fd_context_flush(struct pipe_context *pctx, struct pipe_fence_handle **fence,
 {
 	struct fd_context *ctx = fd_context(pctx);
 
+	if (flags & PIPE_FLUSH_FENCE_FD)
+		ctx->batch->needs_out_fence_fd = true;
+
 	if (!ctx->screen->reorder) {
 		fd_batch_flush(ctx->batch, true);
 	} else {
@@ -251,6 +254,8 @@ fd_context_init(struct fd_context *ctx, struct pipe_screen *pscreen,
 	pctx->flush = fd_context_flush;
 	pctx->emit_string_marker = fd_emit_string_marker;
 	pctx->set_debug_callback = fd_set_debug_callback;
+	pctx->create_fence_fd = fd_create_fence_fd;
+	pctx->fence_server_sync = fd_fence_server_sync;
 
 	/* TODO what about compute?  Ideally it creates it's own independent
 	 * batches per compute job (since it isn't using tiling, so no point

src/gallium/drivers/freedreno/freedreno_fence.c

@@ -26,6 +26,8 @@
  *    Rob Clark <robclark@freedesktop.org>
  */
 
+#include <libsync.h>
+
 #include "util/u_inlines.h"
 
 #include "freedreno_fence.h"
@@ -36,16 +38,23 @@ struct pipe_fence_handle {
 	struct pipe_reference reference;
 	struct fd_context *ctx;
 	struct fd_screen *screen;
+	int fence_fd;
 	uint32_t timestamp;
 };
 
-void
+static void fd_fence_destroy(struct pipe_fence_handle *fence)
-fd_fence_ref(struct pipe_screen *pscreen,
+{
+	if (fence->fence_fd != -1)
+		close(fence->fence_fd);
+	FREE(fence);
+}
+
+void fd_fence_ref(struct pipe_screen *pscreen,
 		struct pipe_fence_handle **ptr,
 		struct pipe_fence_handle *pfence)
 {
 	if (pipe_reference(&(*ptr)->reference, &pfence->reference))
-		FREE(*ptr);
+		fd_fence_destroy(*ptr);
 
 	*ptr = pfence;
 }
@@ -55,14 +64,42 @@ boolean fd_fence_finish(struct pipe_screen *pscreen,
 		struct pipe_fence_handle *fence,
 		uint64_t timeout)
 {
+	if (fence->fence_fd != -1) {
+		int ret = sync_wait(fence->fence_fd, timeout / 1000000);
+		return ret == 0;
+	}
+
 	if (fd_pipe_wait_timeout(fence->screen->pipe, fence->timestamp, timeout))
 		return false;
 
 	return true;
 }
 
+void fd_create_fence_fd(struct pipe_context *pctx,
+		struct pipe_fence_handle **pfence, int fd)
+{
+	*pfence = fd_fence_create(fd_context(pctx), 0, dup(fd));
+}
+
+void fd_fence_server_sync(struct pipe_context *pctx,
+		struct pipe_fence_handle *fence)
+{
+	struct fd_context *ctx = fd_context(pctx);
+	struct fd_batch *batch = ctx->batch;
+
+	if (sync_accumulate("freedreno", &batch->in_fence_fd, fence->fence_fd)) {
+		/* error */
+	}
+}
+
+int fd_fence_get_fd(struct pipe_screen *pscreen,
+		struct pipe_fence_handle *fence)
+{
+	return dup(fence->fence_fd);
+}
+
 struct pipe_fence_handle * fd_fence_create(struct fd_context *ctx,
-		uint32_t timestamp)
+		uint32_t timestamp, int fence_fd)
 {
 	struct pipe_fence_handle *fence;
 
@@ -75,6 +112,7 @@ struct pipe_fence_handle * fd_fence_create(struct fd_context *ctx,
 	fence->ctx = ctx;
 	fence->screen = ctx->screen;
 	fence->timestamp = timestamp;
+	fence->fence_fd = fence_fd;
 
 	return fence;
 }

src/gallium/drivers/freedreno/freedreno_fence.h

@@ -38,9 +38,15 @@ boolean fd_fence_finish(struct pipe_screen *screen,
 		struct pipe_context *ctx,
 		struct pipe_fence_handle *pfence,
 		uint64_t timeout);
+void fd_create_fence_fd(struct pipe_context *pctx,
+		struct pipe_fence_handle **pfence, int fd);
+void fd_fence_server_sync(struct pipe_context *pctx,
+		struct pipe_fence_handle *fence);
+int fd_fence_get_fd(struct pipe_screen *pscreen,
+		struct pipe_fence_handle *pfence);
 
 struct fd_context;
 struct pipe_fence_handle * fd_fence_create(struct fd_context *ctx,
-		uint32_t timestamp);
+		uint32_t timestamp, int fence_fd);
 
 #endif /* FREEDRENO_FENCE_H_ */

src/gallium/drivers/freedreno/freedreno_gmem.c

@@ -399,10 +399,13 @@ fd_gmem_render_tiles(struct fd_batch *batch)
 		ctx->stats.batch_gmem++;
 	}
 
-	fd_ringbuffer_flush(batch->gmem);
+	int out_fence_fd = -1;
+	fd_ringbuffer_flush2(batch->gmem, batch->in_fence_fd,
+			batch->needs_out_fence_fd ? &out_fence_fd : NULL);
 
 	fd_fence_ref(&ctx->screen->base, &ctx->last_fence, NULL);
-	ctx->last_fence = fd_fence_create(ctx, fd_ringbuffer_timestamp(batch->gmem));
+	ctx->last_fence = fd_fence_create(ctx,
+			fd_ringbuffer_timestamp(batch->gmem), out_fence_fd);
 }
 
 /* tile needs restore if it isn't completely contained within the

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -380,7 +380,7 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_UMA:
 		return 1;
 	case PIPE_CAP_NATIVE_FENCE_FD:
-		return 0;
+		return fd_device_version(screen->dev) >= FD_VERSION_FENCE_FD;
 	}
 	debug_printf("unknown param %d\n", param);
 	return 0;
@@ -713,6 +713,7 @@ fd_screen_create(struct fd_device *dev)
 
 	pscreen->fence_reference = fd_fence_ref;
 	pscreen->fence_finish = fd_fence_finish;
+	pscreen->fence_get_fd = fd_fence_get_fd;
 
 	slab_create_parent(&screen->transfer_pool, sizeof(struct fd_transfer), 16);