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Date: Wed, 10 Mar 2021 13:56:29 -0800
From: Peiyong Lin <lpy@...gle.com>
To: Brian Starkey <brian.starkey@....com>
Cc: alexdeucher@...il.com, android-kernel@...gle.com,
dri-devel@...ts.freedesktop.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
nd@....com, Paul Walmsley <paul.walmsley@...ive.com>,
Pavel Machek <pavel@....cz>,
Prahlad Kilambi <prahladk@...gle.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Steven Rostedt <rostedt@...dmis.org>,
Sidath Senanayake <sidaths@...gle.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
zzyiwei@...roid.com
Subject: Re: [PATCH v5] Add power/gpu_frequency tracepoint.
On Mon, Dec 21, 2020 at 12:10 PM Peiyong Lin <lpy@...gle.com> wrote:
>
> Historically there is no common trace event for GPU frequency, in
> downstream Android each different hardware vendor implements their own
> way to expose GPU frequency, for example as a debugfs node. This patch
> standardize it as a common trace event in upstream linux kernel to help
> the ecosystem have a common implementation across hardware vendors.
> Toolings in the Linux ecosystem will benefit from this especially in the
> downstream Android, where this information is critical to graphics
> developers.
>
> Signed-off-by: Peiyong Lin <lpy@...gle.com>
> ---
>
> Changelog since v4:
> - Explicitly use class id and instance id to identify a GPU instance.
> - Change gpu_id to clock_id to call out its the clock domain in
> the GPU instance.
>
> Changelog since v3:
> - Correct copyright title.
>
> Changelog since v2:
> - Add more comments to indicate when the event should be emitted.
> - Change state to frequency.
>
> Changelog since v1:
> - Use %u in TP_printk
>
> drivers/gpu/Makefile | 1 +
> drivers/gpu/trace/Kconfig | 3 ++
> drivers/gpu/trace/Makefile | 1 +
> drivers/gpu/trace/trace_gpu_frequency.c | 13 ++++++++
> include/trace/events/power.h | 41 +++++++++++++++++++++++++
> 5 files changed, 59 insertions(+)
> create mode 100644 drivers/gpu/trace/trace_gpu_frequency.c
>
> diff --git a/drivers/gpu/Makefile b/drivers/gpu/Makefile
> index 835c88318cec..f289a47eb031 100644
> --- a/drivers/gpu/Makefile
> +++ b/drivers/gpu/Makefile
> @@ -6,3 +6,4 @@ obj-$(CONFIG_TEGRA_HOST1X) += host1x/
> obj-y += drm/ vga/
> obj-$(CONFIG_IMX_IPUV3_CORE) += ipu-v3/
> obj-$(CONFIG_TRACE_GPU_MEM) += trace/
> +obj-$(CONFIG_TRACE_GPU_FREQUENCY) += trace/
> diff --git a/drivers/gpu/trace/Kconfig b/drivers/gpu/trace/Kconfig
> index c24e9edd022e..ac4aec8d5845 100644
> --- a/drivers/gpu/trace/Kconfig
> +++ b/drivers/gpu/trace/Kconfig
> @@ -2,3 +2,6 @@
>
> config TRACE_GPU_MEM
> bool
> +
> +config TRACE_GPU_FREQUENCY
> + bool
> diff --git a/drivers/gpu/trace/Makefile b/drivers/gpu/trace/Makefile
> index b70fbdc5847f..2b7ae69327d6 100644
> --- a/drivers/gpu/trace/Makefile
> +++ b/drivers/gpu/trace/Makefile
> @@ -1,3 +1,4 @@
> # SPDX-License-Identifier: GPL-2.0
>
> obj-$(CONFIG_TRACE_GPU_MEM) += trace_gpu_mem.o
> +obj-$(CONFIG_TRACE_GPU_FREQUENCY) += trace_gpu_frequency.o
> diff --git a/drivers/gpu/trace/trace_gpu_frequency.c b/drivers/gpu/trace/trace_gpu_frequency.c
> new file mode 100644
> index 000000000000..668fabd6b77a
> --- /dev/null
> +++ b/drivers/gpu/trace/trace_gpu_frequency.c
> @@ -0,0 +1,13 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * GPU frequency trace points
> + *
> + * Copyright (C) 2020 Google LLC
> + */
> +
> +#include <linux/module.h>
> +
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/power.h>
> +
> +EXPORT_TRACEPOINT_SYMBOL(gpu_frequency);
> diff --git a/include/trace/events/power.h b/include/trace/events/power.h
> index af5018aa9517..590e16169dd1 100644
> --- a/include/trace/events/power.h
> +++ b/include/trace/events/power.h
> @@ -500,6 +500,47 @@ DEFINE_EVENT(dev_pm_qos_request, dev_pm_qos_remove_request,
>
> TP_ARGS(name, type, new_value)
> );
> +
> +/**
> + * gpu_frequency - Reports the GPU frequency in GPU clock domains.
> + *
> + * This event should be emitted whenever there's a GPU frequency change happens,
> + * or a GPU goes from idle state to active state, or vice versa.
> + *
> + * When the GPU goes from idle state to active state, this event should report
> + * the GPU frequency of the active state. When the GPU goes from active state to
> + * idle state, this event should report a zero frequency value.
> + *
> + * @frequency: New frequency (in KHz)
> + * @gpu_class_id: Id representing the class of the GPU
> + * @gpu_instance_id: Id representing the instance of class &gpu_class_id
> + * @clock_id: Id for the clock domain in &gpu_instance_id running at &frequency
> + */
> +TRACE_EVENT(gpu_frequency,
> +
> + TP_PROTO(unsigned int frequency, unsigned int gpu_class_id,
> + unsigned int gpu_instance_id, unsigned int clock_id),
> +
> + TP_ARGS(frequency, gpu_class_id, gpu_instance_id, clock_id),
> +
> + TP_STRUCT__entry(
> + __field(unsigned int, frequency)
> + __field(unsigned int, gpu_class_id)
> + __field(unsigned int, gpu_instance_id)
> + __field(unsigned int, clock_id)
> + ),
> +
> + TP_fast_assign(
> + __entry->frequency = frequency;
> + __entry->gpu_class_id = gpu_class_id;
> + __entry->gpu_instance_id = gpu_instance_id;
> + __entry->clock_id = clock_id;
> + ),
> +
> + TP_printk("frequency=%u gpu_class_id=%u gpu_instance_id=%u clock_id=%u",
> + __entry->frequency, __entry->gpu_class_id,
> + __entry->gpu_instance_id, __entry->clock_id)
> +);
> #endif /* _TRACE_POWER_H */
>
> /* This part must be outside protection */
> --
> 2.29.2.684.gfbc64c5ab5-goog
>
Hi there,
Could you please take a look at this patch?
Thanks,
Peiyong
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