drm/nouveau: Add getparam to get available PGRAPH units.

On nv50, this will be needed by applications using CUDA to know
how much stack/local memory to allocate.

Signed-off-by: Marcin Koƛcielnicki <koriakin@0x04.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/include/drm/nouveau_drm.h b/include/drm/nouveau_drm.h
index 1e67c44..f745948 100644
--- a/include/drm/nouveau_drm.h
+++ b/include/drm/nouveau_drm.h
@@ -77,6 +77,7 @@
 #define NOUVEAU_GETPARAM_PCI_PHYSICAL    10
 #define NOUVEAU_GETPARAM_CHIPSET_ID      11
 #define NOUVEAU_GETPARAM_VM_VRAM_BASE    12
+#define NOUVEAU_GETPARAM_GRAPH_UNITS     13
 struct drm_nouveau_getparam {
 	uint64_t param;
 	uint64_t value;