[PATCH v4 2/2] drm/amdgpu: add reset register dump trace on GPU reset

[Andrey Grodzovsky]

On 2022-02-15 05:12, Somalapuram Amaranath wrote:
> Dump the list of register values to trace event on GPU reset.
>
> Signed-off-by: Somalapuram Amaranath <Amaranath.Somalapuram at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 17 ++++++++++++++++-
>   drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h  | 16 ++++++++++++++++
>   2 files changed, 32 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 1e651b959141..ff21262c6fea 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -4534,6 +4534,19 @@ int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
>   	return r;
>   }
>   
> +static int amdgpu_reset_reg_dumps(struct amdgpu_device *adev)
> +{
> +	uint32_t reg_value;
> +	int i;
> +
> +	for (i = 0; i < adev->n_regs; i++) {
> +		reg_value = RREG32(adev->reset_dump_reg_list[i]);
> +		trace_amdgpu_reset_reg_dumps(adev->reset_dump_reg_list[i], reg_value);
> +	}
> +
> +	return 0;
> +}
> +
>   int amdgpu_do_asic_reset(struct list_head *device_list_handle,
>   			 struct amdgpu_reset_context *reset_context)
>   {
> @@ -4567,8 +4580,10 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
>   				tmp_adev->gmc.xgmi.pending_reset = false;
>   				if (!queue_work(system_unbound_wq, &tmp_adev->xgmi_reset_work))
>   					r = -EALREADY;
> -			} else
> +			} else {
> +				amdgpu_reset_reg_dumps(tmp_adev);
>   				r = amdgpu_asic_reset(tmp_adev);
> +			}


Is there any particular reason you only dump registers in single ASIC 
case and not for XGMI ?

Andrey


>   
>   			if (r) {
>   				dev_err(tmp_adev->dev, "ASIC reset failed with error, %d for drm dev, %s",
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
> index d855cb53c7e0..b9637925e85c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
> @@ -537,6 +537,22 @@ TRACE_EVENT(amdgpu_ib_pipe_sync,
>   		      __entry->seqno)
>   );
>   
> +TRACE_EVENT(amdgpu_reset_reg_dumps,
> +	    TP_PROTO(uint32_t address, uint32_t value),
> +	    TP_ARGS(address, value),
> +	    TP_STRUCT__entry(
> +			     __field(uint32_t, address)
> +			     __field(uint32_t, value)
> +			     ),
> +	    TP_fast_assign(
> +			   __entry->address = address;
> +			   __entry->value = value;
> +			   ),
> +	    TP_printk("amdgpu register dump 0x%x: 0x%x",
> +		      __entry->address,
> +		      __entry->value)
> +);
> +
>   #undef AMDGPU_JOB_GET_TIMELINE_NAME
>   #endif
>