gpu: nvgpu: vgpu: fix regressions causing crashes

Client OS was accessing gpu registers directly, resulting in a crash:

- Use gk20a version of init_gpu_characteristics
- Set cbc_ctrl callback to NULL

Bug 1749990
Bug 1749896

Change-Id: I7e5eea52c5d1d0c2ca7ca5e4d34dc4fc21f4e093
Signed-off-by: Peter Daifuku <pdaifuku@nvidia.com>
Reviewed-on: http://git-master/r/1120473
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/vgpu/ltc_vgpu.c b/drivers/gpu/nvgpu/vgpu/ltc_vgpu.c
index 76ee5ec9..1adb8b22 100644
--- a/drivers/gpu/nvgpu/vgpu/ltc_vgpu.c
+++ b/drivers/gpu/nvgpu/vgpu/ltc_vgpu.c
@@ -1,7 +1,7 @@
 /*
  * Virtualized GPU L2
  *
- * Copyright (c) 2014-2015 NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2016 NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -82,4 +82,5 @@ void vgpu_init_ltc_ops(struct gpu_ops *gops)
         gops->ltc.determine_L2_size_bytes = vgpu_determine_L2_size_bytes;
         gops->ltc.init_comptags = vgpu_ltc_init_comptags;
         gops->ltc.init_fs_state = vgpu_ltc_init_fs_state;
+        gops->ltc.cbc_ctrl = NULL;
 }