gpu: nvgpu: Allow enabling PC sampling

Allow enabling of PC sampling hardware workaround. It is only
applicable to gm20b.

Bug 1517458
Bug 1573150

Change-Id: Iad6a3ae556489fb7ab9628637d291849d2cd98ea
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/710421

1 files changed, 13 insertions, 1 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index 3c53ba94..9e3a362f 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -457,8 +457,20 @@ struct nvgpu_dbg_gpu_perfbuf_unmap_args {
 #define NVGPU_DBG_GPU_IOCTL_PERFBUF_UNMAP \
         _IOWR(NVGPU_DBG_GPU_IOCTL_MAGIC, 8, struct nvgpu_dbg_gpu_perfbuf_unmap_args)
 
+/* Enable/disable PC Sampling */
+struct nvgpu_dbg_gpu_pc_sampling_args {
+        __u32 enable;
+        __u32 _pad0[1];
+};
+
+#define NVGPU_DBG_GPU_IOCTL_PC_SAMPLING_DISABLE 0
+#define NVGPU_DBG_GPU_IOCTL_PC_SAMPLING_ENABLE  1
+
+#define NVGPU_DBG_GPU_IOCTL_PC_SAMPLING \
+        _IOW(NVGPU_DBG_GPU_IOCTL_MAGIC,  9, struct nvgpu_dbg_gpu_pc_sampling_args)
+
 #define NVGPU_DBG_GPU_IOCTL_LAST                \
-        _IOC_NR(NVGPU_DBG_GPU_IOCTL_PERFBUF_UNMAP)
+        _IOC_NR(NVGPU_DBG_GPU_IOCTL_PC_SAMPLING)
 #define NVGPU_DBG_GPU_IOCTL_MAX_ARG_SIZE                \
         sizeof(struct nvgpu_dbg_gpu_perfbuf_map_args)