drm/gem: add flink support

3 files changed, 40 insertions, 0 deletions

diff --git a/include/drm/drm.h b/include/drm/drm.h
index cbf80bbf..53eac4a4 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -618,6 +618,19 @@ struct drm_get_cap {
 	__u64 value;
 };
 
+struct drm_gem_flink_to {
+	/** Handle for the object being named */
+	__u32 handle;
+
+	/** Magic for destination file_priv */
+	__u32 magic;
+
+	/** Returned name for the object */
+	__u32 name;
+
+	__u32 pad;
+};
+
 #define DRM_CLOEXEC O_CLOEXEC
 struct drm_prime_handle {
 	__u32 handle;
@@ -650,6 +663,7 @@ struct drm_prime_handle {
 #define DRM_IOCTL_GEM_FLINK		DRM_IOWR(0x0a, struct drm_gem_flink)
 #define DRM_IOCTL_GEM_OPEN		DRM_IOWR(0x0b, struct drm_gem_open)
 #define DRM_IOCTL_GET_CAP		DRM_IOWR(0x0c, struct drm_get_cap)
+#define DRM_IOCTL_GEM_FLINK_TO		DRM_IOWR(0x0d, struct drm_gem_flink_to)
 
 #define DRM_IOCTL_SET_UNIQUE		DRM_IOW( 0x10, struct drm_unique)
 #define DRM_IOCTL_AUTH_MAGIC		DRM_IOW( 0x11, struct drm_auth)
diff --git a/xf86drm.c b/xf86drm.c
index 2a74c807..00a25cf3 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -2543,6 +2543,31 @@ char *drmGetDeviceNameFromFd(int fd)
 	return strdup(name);
 }
 
+uint32_t drmGemFlinkTo(int fd, drm_magic_t magic, uint32_t handle)
+{
+	struct drm_gem_flink_to flink_to;
+	int ret;
+
+	memset(&flink_to, 0, sizeof flink_to);
+
+	flink_to.handle = handle;
+	flink_to.magic = magic;
+
+	do {
+		ret = ioctl(fd,
+			    DRM_IOCTL_GEM_FLINK_TO,
+			    &flink_to);
+	} while (ret == -1 && errno == EINTR);
+
+	if (ret != 0) {
+		fprintf(stderr, "Couldn't flink_to handle 0x%08x: %s\n",
+			handle, strerror(errno));
+		return 0;
+	}
+
+	return flink_to.name;
+}
+
 int drmPrimeHandleToFD(int fd, uint32_t handle, uint32_t flags, int *prime_fd)
 {
 	struct drm_prime_handle args;
diff --git a/xf86drm.h b/xf86drm.h
index 5ecb2846..bcaae35f 100644
--- a/xf86drm.h
+++ b/xf86drm.h
@@ -727,6 +727,7 @@ extern int drmHandleEvent(int fd, drmEventContextPtr evctx);
 
 extern char *drmGetDeviceNameFromFd(int fd);
 
+extern uint32_t drmGemFlinkTo(int fd, drm_magic_t magic, uint32_t handle);
 extern int drmPrimeHandleToFD(int fd, uint32_t handle, uint32_t flags, int *prime_fd);
 extern int drmPrimeFDToHandle(int fd, int prime_fd, uint32_t *handle);