libdrm: add prime fd->handle and handle->fd interfaces

These are just basic ioctl wrappers around the prime ioctls,
along with the capability reporting.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/xf86drm.c b/xf86drm.c
index 6ea068f4..2a74c807 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -2542,3 +2542,34 @@ char *drmGetDeviceNameFromFd(int fd)
 
 	return strdup(name);
 }
+
+int drmPrimeHandleToFD(int fd, uint32_t handle, uint32_t flags, int *prime_fd)
+{
+	struct drm_prime_handle args;
+	int ret;
+
+	args.handle = handle;
+	args.flags = flags;
+	ret = drmIoctl(fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &args);
+	if (ret)
+		return ret;
+
+	*prime_fd = args.fd;
+	return 0;
+}
+
+int drmPrimeFDToHandle(int fd, int prime_fd, uint32_t *handle)
+{
+	struct drm_prime_handle args;
+	int ret;
+
+	args.fd = prime_fd;
+	args.flags = 0;
+	ret = drmIoctl(fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &args);
+	if (ret)
+		return ret;
+
+	*handle = args.handle;
+	return 0;
+}
+