gpu: nvgpu: Implement NVGPU_GPU_IOCTL_GET_GPU_TIME

Implement NVGPU_GPU_IOCTL_GET_GPU_TIME for reading the GPU time.

Bug 1395833

Change-Id: I7ddc7c28ff0c9a336cc0dcd820b15fb0fea714d0
Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-on: http://git-master/r/1125630
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index d84c5440..cf89b9d8 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -377,6 +377,14 @@ struct nvgpu_gpu_get_cpu_time_correlation_info_args {
         __u32 source_id;
 };
 
+struct nvgpu_gpu_get_gpu_time_args {
+        /* raw GPU counter (PTIMER) value */
+        __u64 gpu_timestamp;
+
+        /* reserved for future extensions */
+        __u64 reserved;
+};
+
 #define NVGPU_GPU_IOCTL_ZCULL_GET_CTX_SIZE \
         _IOR(NVGPU_GPU_IOCTL_MAGIC, 1, struct nvgpu_gpu_zcull_get_ctx_size_args)
 #define NVGPU_GPU_IOCTL_ZCULL_GET_INFO \
@@ -426,8 +434,11 @@ struct nvgpu_gpu_get_cpu_time_correlation_info_args {
 #define NVGPU_GPU_IOCTL_GET_CPU_TIME_CORRELATION_INFO \
         _IOWR(NVGPU_GPU_IOCTL_MAGIC, 24, \
                         struct nvgpu_gpu_get_cpu_time_correlation_info_args)
+#define NVGPU_GPU_IOCTL_GET_GPU_TIME \
+        _IOWR(NVGPU_GPU_IOCTL_MAGIC, 25, \
+                        struct nvgpu_gpu_get_gpu_time_args)
 #define NVGPU_GPU_IOCTL_LAST            \
-        _IOC_NR(NVGPU_GPU_IOCTL_GET_CPU_TIME_CORRELATION_INFO)
+        _IOC_NR(NVGPU_GPU_IOCTL_GET_GPU_TIME)
 #define NVGPU_GPU_IOCTL_MAX_ARG_SIZE    \
         sizeof(struct nvgpu_gpu_get_cpu_time_correlation_info_args)