[PATCH 3/5] drm/syncobj: add sync_file interaction.

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

This interface allows importing the fence from a sync_file into
an existing drm sync object, or exporting the fence attached to
an existing drm sync object into a new sync file object.

This should only be used to interact with sync files where necessary.

Reviewed-by: Sean Paul <seanpaul at chromium.org>
Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/drm_syncobj.c | 64 +++++++++++++++++++++++++++++++++++++++++--
 include/uapi/drm/drm.h        |  2 ++
 2 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 8b87594..54d751e 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -50,6 +50,7 @@
 #include <linux/file.h>
 #include <linux/fs.h>
 #include <linux/anon_inodes.h>
+#include <linux/sync_file.h>
 
 #include "drm_internal.h"
 #include <drm/drm_syncobj.h>
@@ -276,6 +277,48 @@ static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
 	return 0;
 }
 
+int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
+				       int fd, int handle)
+{
+	struct dma_fence *fence = sync_file_get_fence(fd);
+	if (!fence)
+		return -EINVAL;
+
+	return drm_syncobj_replace_fence(file_private, handle, fence);
+}
+
+int drm_syncobj_export_sync_file(struct drm_file *file_private,
+				 int handle, int *p_fd)
+{
+	int ret;
+	struct dma_fence *fence;
+	struct sync_file *sync_file;
+	int fd = get_unused_fd_flags(O_CLOEXEC);
+
+	if (fd < 0)
+		return fd;
+
+	ret = drm_syncobj_fence_get(file_private, handle, &fence);
+	if (ret)
+		goto err_put_fd;
+
+	sync_file = sync_file_create(fence);
+	if (!sync_file) {
+		ret = -EINVAL;
+		goto err_fence_put;
+	}
+
+	fd_install(fd, sync_file->file);
+
+	dma_fence_put(fence);
+	*p_fd = fd;
+	return 0;
+err_fence_put:
+	dma_fence_put(fence);
+err_put_fd:
+	put_unused_fd(fd);
+	return ret;
+}
 /**
  * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time
  * @dev: drm_device which is being opened by userspace
@@ -358,9 +401,17 @@ drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
 	if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 		return -ENODEV;
 
-	if (args->pad || args->flags)
+	if (args->pad)
+		return -EINVAL;
+
+	if (args->flags != 0 &&
+	    args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_FENCE_SYNC_FILE)
 		return -EINVAL;
 
+	if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_FENCE_SYNC_FILE)
+		return drm_syncobj_export_sync_file(file_private, args->handle,
+						    &args->fd);
+
 	return drm_syncobj_handle_to_fd(file_private, args->handle,
 					&args->fd);
 }
@@ -374,9 +425,18 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
 	if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 		return -ENODEV;
 
-	if (args->pad || args->flags)
+	if (args->pad)
 		return -EINVAL;
 
+	if (args->flags != 0 &&
+	    args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE_FENCE)
+		return -EINVAL;
+
+	if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE_FENCE)
+		return drm_syncobj_import_sync_file_fence(file_private,
+							  args->fd,
+							  args->handle);
+
 	return drm_syncobj_fd_to_handle(file_private, args->fd,
 					&args->handle);
 }
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index d6e2f62..94c75be 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -708,6 +708,8 @@ struct drm_syncobj_destroy {
 	__u32 pad;
 };
 
+#define DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE_FENCE (1 << 0)
+#define DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_FENCE_SYNC_FILE (1 << 0)
 struct drm_syncobj_handle {
 	__u32 handle;
 	__u32 flags;
-- 
2.9.4