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→/dev/nvhost-ctrl-gpu
| 0xC008471B || Inout || 8 || [[#NVGPU_GPU_IOCTL_GET_ERROR_CHANNEL_USER_DATA]]
| 0xC008471B || Inout || 8 || [[#NVGPU_GPU_IOCTL_GET_ERROR_CHANNEL_USER_DATA]]
|-
|-
| 0xC010471C || Inout || 16 || NVGPU_GPU_IOCTL_GET_GPU_TIME
| 0xC010471C || Inout || 16 || [[#NVGPU_GPU_IOCTL_GET_GPU_TIME]]
|-
|-
| 0xC108471D || Inout || 264 || NVGPU_GPU_IOCTL_GET_CPU_TIME_CORRELATION_INFO
| 0xC108471D || Inout || 264 || [[#NVGPU_GPU_IOCTL_GET_CPU_TIME_CORRELATION_INFO]]
|}
|}
__out u64 data;
__out u64 data;
};
};
=== NVGPU_GPU_IOCTL_GET_GPU_TIME ===
Returns the timestamp from the GPU's nanosecond timer (PTIMER). Identical to Linux driver.
struct {
__out u64 gpu_timestamp; // raw GPU counter (PTIMER) value
__out u64 reserved;
};
=== NVGPU_GPU_IOCTL_GET_CPU_TIME_CORRELATION_INFO ===
Returns GPU/CPU timestamp pairs for correlation analysis. Identical to Linux driver.
struct time_correlation_sample {
u64 cpu_timestamp; // from CPU's CNTPCT_EL0 register
u64 gpu_timestamp; // from GPU's PTIMER registers
};
struct {
__out struct time_correlation_sample samples[16]; // timestamp pairs
__in u32 count; // number of pairs to read
__in u32 source_id; // cpu clock source id (must be 1)
};
== Channels ==
== Channels ==