drm/nouveau/nvif: split out fifo interface definitions

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/include/nvif/cl506e.h b/drivers/gpu/drm/nouveau/include/nvif/cl506e.h
new file mode 100644
index 0000000..aa94b8c
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/include/nvif/cl506e.h
@@ -0,0 +1,12 @@
+#ifndef __NVIF_CL506E_H__
+#define __NVIF_CL506E_H__
+
+struct nv50_channel_dma_v0 {
+	__u8  version;
+	__u8  chid;
+	__u8  pad02[6];
+	__u64 vm;
+	__u64 pushbuf;
+	__u64 offset;
+};
+#endif