nvc0: reduce likelihood of collision for real buffers on Fermi

Reduce likelihood of collision with real buffers by placing the
hole at the top of the 4G area. This fixes some indirect draw+compute
tests with large buffers.

Suggested by Ilia Mirkin.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>

src/gallium/drivers/nouveau/nvc0/nvc0_compute.c

@@ -90,13 +90,13 @@ nvc0_screen_compute_setup(struct nvc0_screen *screen,
    BEGIN_NVC0(push, NVC0_COMPUTE(WARP_TEMP_ALLOC), 1);
    PUSH_DATA (push, 0);
    BEGIN_NVC0(push, NVC0_COMPUTE(LOCAL_BASE), 1);
-   PUSH_DATA (push, 1 << 24);
+   PUSH_DATA (push, 0xff << 24);
 
    /* shared memory setup */
    BEGIN_NVC0(push, NVC0_COMPUTE(CACHE_SPLIT), 1);
    PUSH_DATA (push, NVC0_COMPUTE_CACHE_SPLIT_48K_SHARED_16K_L1);
    BEGIN_NVC0(push, NVC0_COMPUTE(SHARED_BASE), 1);
-   PUSH_DATA (push, 2 << 24);
+   PUSH_DATA (push, 0xfe << 24);
    BEGIN_NVC0(push, NVC0_COMPUTE(SHARED_SIZE), 1);
    PUSH_DATA (push, 0);