linux-kernel - Re: [PATCH v2 1/4] drm/amd/display: Rework registers tracepoint

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Date:   Fri, 11 Sep 2020 13:13:30 -0400
From:   "Kazlauskas, Nicholas" <nicholas.kazlauskas@....com>
To:     Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, hersenxs.wu@....com
Subject: Re: [PATCH v2 1/4] drm/amd/display: Rework registers tracepoint

On 2020-09-11 10:59 a.m., Rodrigo Siqueira wrote:
> amdgpu_dc_rreg and amdgpu_dc_wreg are very similar, for this reason,
> this commits abstract these two events by using DECLARE_EVENT_CLASS and
> create an instance of it for each one of these events.
> 
> Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>

This looks reasonable to me. Does this still show up as 
amdpgu_dc_rrreg/amdgpu_dc_wreg in the captured trace log?

As long as we can still tell this apart you can consider this patch:

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>

Regards,
Nicholas Kazlauskas

> ---
>   .../amd/display/amdgpu_dm/amdgpu_dm_trace.h   | 55 ++++++++-----------
>   1 file changed, 24 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h
> index d898981684d5..dd34e11b1079 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h
> @@ -31,40 +31,33 @@
>   
>   #include <linux/tracepoint.h>
>   
> -TRACE_EVENT(amdgpu_dc_rreg,
> -	TP_PROTO(unsigned long *read_count, uint32_t reg, uint32_t value),
> -	TP_ARGS(read_count, reg, value),
> -	TP_STRUCT__entry(
> -			__field(uint32_t, reg)
> -			__field(uint32_t, value)
> -		),
> -	TP_fast_assign(
> -			__entry->reg = reg;
> -			__entry->value = value;
> -			*read_count = *read_count + 1;
> -		),
> -	TP_printk("reg=0x%08lx, value=0x%08lx",
> -			(unsigned long)__entry->reg,
> -			(unsigned long)__entry->value)
> -);
> +DECLARE_EVENT_CLASS(amdgpu_dc_reg_template,
> +		    TP_PROTO(unsigned long *count, uint32_t reg, uint32_t value),
> +		    TP_ARGS(count, reg, value),
>   
> -TRACE_EVENT(amdgpu_dc_wreg,
> -	TP_PROTO(unsigned long *write_count, uint32_t reg, uint32_t value),
> -	TP_ARGS(write_count, reg, value),
> -	TP_STRUCT__entry(
> -			__field(uint32_t, reg)
> -			__field(uint32_t, value)
> -		),
> -	TP_fast_assign(
> -			__entry->reg = reg;
> -			__entry->value = value;
> -			*write_count = *write_count + 1;
> -		),
> -	TP_printk("reg=0x%08lx, value=0x%08lx",
> -			(unsigned long)__entry->reg,
> -			(unsigned long)__entry->value)
> +		    TP_STRUCT__entry(
> +				     __field(uint32_t, reg)
> +				     __field(uint32_t, value)
> +		    ),
> +
> +		    TP_fast_assign(
> +				   __entry->reg = reg;
> +				   __entry->value = value;
> +				   *count = *count + 1;
> +		    ),
> +
> +		    TP_printk("reg=0x%08lx, value=0x%08lx",
> +			      (unsigned long)__entry->reg,
> +			      (unsigned long)__entry->value)
>   );
>   
> +DEFINE_EVENT(amdgpu_dc_reg_template, amdgpu_dc_rreg,
> +	     TP_PROTO(unsigned long *count, uint32_t reg, uint32_t value),
> +	     TP_ARGS(count, reg, value));
> +
> +DEFINE_EVENT(amdgpu_dc_reg_template, amdgpu_dc_wreg,
> +	     TP_PROTO(unsigned long *count, uint32_t reg, uint32_t value),
> +	     TP_ARGS(count, reg, value));
>   
>   TRACE_EVENT(amdgpu_dc_performance,
>   	TP_PROTO(unsigned long read_count, unsigned long write_count,
>