nouveau: bind the 3D engine to subchannel 7 and add RING_3D

RING_3D creates a method start for subchannel 7.

Bind the 3D engine to a fixed subchannel to make it work

This is much faster than the old BEGIN_RING, since we don't need
to waste cycles trying to "autobind" stuff, when a fast static binding
is perfectly good.

Subchannel 7 is chosen because the kernel takes up the lowest ones.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/gallium/drivers/nouveau/nouveau_screen.h b/src/gallium/drivers/nouveau/nouveau_screen.h
index c0ec6e48952..f32ecd0b69b 100644
--- a/src/gallium/drivers/nouveau/nouveau_screen.h
+++ b/src/gallium/drivers/nouveau/nouveau_screen.h
@@ -60,4 +60,16 @@ void nouveau_screen_fini(struct nouveau_screen *);
 
 
 
+static __inline__ unsigned
+RING_3D(unsigned mthd, unsigned size)
+{
+	return (7 << 13) | (size << 18) | mthd;
+}
+
+static __inline__ unsigned
+RING_3D_NI(unsigned mthd, unsigned size)
+{
+	return 0x40000000 | (7 << 13) | (size << 18) | mthd;
+}
+
 #endif