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gpu: nvgpu: Provide cpu gpu time correlation via ioctl

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bug 1648908

Provides pairs of CPU and GPU timestamps that
can be used for correlatiing the two timebases

- IOCTL made available /dev/nvhost-ctrl-gpu

Change-Id: I1458b9d33d794b1b02ec9fd29ed9426756b94bcd
Signed-off-by: Arul Sekar <aruls@nvidia.com>
Reviewed-on: http://git-master/r/1029732
Reviewed-by: Arun Gona <agona@nvidia.com>
Tested-by: Arun Gona <agona@nvidia.com>
Reviewed-on: http://git-master/r/1111715
GVS: Gerrit_Virtual_Submit
Reviewed-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Arul Sekar
2016-03-11 11:24:20 -08:00
committed by Terje Bergstrom
parent 97108797a2
commit 032efd066e
4 changed files with 139 additions and 5 deletions
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30
include/uapi/linux/nvgpu.h
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@@ -351,6 +351,28 @@ struct nvgpu_gpu_get_buffer_info_args {
};
};
#define NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_MAX_COUNT 16
#define NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_SRC_ID_TSC 1
#define NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_SRC_ID_JIFFIES 2
#define NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_SRC_ID_TIMEOFDAY 3
struct nvgpu_gpu_get_cpu_time_correlation_sample {
/* gpu timestamp value */
__u64 cpu_timestamp;
/* raw GPU counter (PTIMER) value */
__u64 gpu_timestamp;
};
struct nvgpu_gpu_get_cpu_time_correlation_info_args {
/* timestamp pairs */
struct nvgpu_gpu_get_cpu_time_correlation_sample samples[
NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_MAX_COUNT];
/* number of pairs to read */
__u32 count;
/* cpu clock source id */
__u32 source_id;
};
#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 \
@@ -397,11 +419,13 @@ struct nvgpu_gpu_get_buffer_info_args {
_IO(NVGPU_GPU_IOCTL_MAGIC, 22)
#define NVGPU_GPU_IOCTL_CLEAR_SM_ERRORS \
_IO(NVGPU_GPU_IOCTL_MAGIC, 23)
#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_LAST \
_IOC_NR(NVGPU_GPU_IOCTL_CLEAR_SM_ERRORS)
_IOC_NR(NVGPU_GPU_IOCTL_GET_CPU_TIME_CORRELATION_INFO)
#define NVGPU_GPU_IOCTL_MAX_ARG_SIZE \
sizeof(struct nvgpu_gpu_prepare_compressible_read_args)
sizeof(struct nvgpu_gpu_get_cpu_time_correlation_info_args)
/*
* /dev/nvhost-tsg-gpu device