linux-kernel - Re: [PATCH 1/3] drm/msm/gpu: Add GPU freq

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Date:   Wed, 2 Sep 2020 14:40:45 -0600
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Sharat Masetty <smasetty@...eaurora.org>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <freedreno@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] drm/msm/gpu: Add GPU freq_change traces

On Tue, Sep 01, 2020 at 08:41:54AM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> Technically the GMU specific one is a bit redundant, but it was useful
> to track down a bug.

Reviewed-by: Jordan Crouse <jcrouse@...eaurora.org>

> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c |  3 +++
>  drivers/gpu/drm/msm/msm_gpu.c         |  2 ++
>  drivers/gpu/drm/msm/msm_gpu_trace.h   | 31 +++++++++++++++++++++++++++
>  3 files changed, 36 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 46a29e383bfd..ab1e9eb619e0 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -11,6 +11,7 @@
>  #include "a6xx_gpu.h"
>  #include "a6xx_gmu.xml.h"
>  #include "msm_gem.h"
> +#include "msm_gpu_trace.h"
>  #include "msm_mmu.h"
>  
>  static void a6xx_gmu_fault(struct a6xx_gmu *gmu)
> @@ -124,6 +125,8 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp)
>  	gmu->current_perf_index = perf_index;
>  	gmu->freq = gmu->gpu_freqs[perf_index];
>  
> +	trace_msm_gmu_freq_change(gmu->freq, perf_index);
> +
>  	/*
>  	 * This can get called from devfreq while the hardware is idle. Don't
>  	 * bring up the power if it isn't already active
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index d5645472b25d..b02866527386 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -32,6 +32,8 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
>  	if (IS_ERR(opp))
>  		return PTR_ERR(opp);
>  
> +	trace_msm_gpu_freq_change(dev_pm_opp_get_freq(opp));
> +
>  	if (gpu->funcs->gpu_set_freq)
>  		gpu->funcs->gpu_set_freq(gpu, opp);
>  	else
> diff --git a/drivers/gpu/drm/msm/msm_gpu_trace.h b/drivers/gpu/drm/msm/msm_gpu_trace.h
> index 122b84789238..07572ab179fa 100644
> --- a/drivers/gpu/drm/msm/msm_gpu_trace.h
> +++ b/drivers/gpu/drm/msm/msm_gpu_trace.h
> @@ -83,6 +83,37 @@ TRACE_EVENT(msm_gpu_submit_retired,
>  		    __entry->start_ticks, __entry->end_ticks)
>  );
>  
> +
> +TRACE_EVENT(msm_gpu_freq_change,
> +		TP_PROTO(u32 freq),
> +		TP_ARGS(freq),
> +		TP_STRUCT__entry(
> +			__field(u32, freq)
> +			),
> +		TP_fast_assign(
> +			/* trace freq in MHz to match intel_gpu_freq_change, to make life easier
> +			 * for userspace
> +			 */
> +			__entry->freq = DIV_ROUND_UP(freq, 1000000);
> +			),
> +		TP_printk("new_freq=%u", __entry->freq)
> +);
> +
> +
> +TRACE_EVENT(msm_gmu_freq_change,
> +		TP_PROTO(u32 freq, u32 perf_index),
> +		TP_ARGS(freq, perf_index),
> +		TP_STRUCT__entry(
> +			__field(u32, freq)
> +			__field(u32, perf_index)
> +			),
> +		TP_fast_assign(
> +			__entry->freq = freq;
> +			__entry->perf_index = perf_index;
> +			),
> +		TP_printk("freq=%u, perf_index=%u", __entry->freq, __entry->perf_index)
> +);
> +
>  #endif
>  
>  #undef TRACE_INCLUDE_PATH
> -- 
> 2.26.2
> 

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