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Date:   Wed, 2 Dec 2020 12:34:20 +0000
From:   Brian Starkey <brian.starkey@arm.com>
To:     Peiyong Lin <lpy@google.com>
Cc:     Steven Rostedt <rostedt@goodmis.org>, alexdeucher@gmail.com,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Sidath Senanayake <sidaths@google.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Prahlad Kilambi <prahladk@google.com>,
        Ingo Molnar <mingo@redhat.com>, Pavel Machek <pavel@ucw.cz>,
        Paul Walmsley <paul.walmsley@sifive.com>, zzyiwei@android.com,
        android-kernel@google.com, nd@arm.com
Subject: Re: [PATCH v4] Add power/gpu_frequency tracepoint.
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Hi Peiyong,

On Mon, Nov 30, 2020 at 02:33:59PM -0800, Peiyong Lin wrote:
> On Tue, Nov 17, 2020 at 1:31 PM Peiyong Lin <lpy@google.com> wrote:
> >
> > On Thu, Oct 22, 2020 at 10:34 AM Peiyong Lin <lpy@google.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@google.com>
> > > ---
> > >
> > > 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            | 33 +++++++++++++++++++++++++
> > >  5 files changed, 51 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..343825a76953 100644
> > > --- a/include/trace/events/power.h
> > > +++ b/include/trace/events/power.h
> > > @@ -500,6 +500,39 @@ 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_id: Id for each GPU clock domain

Thinking about options for how to assign this, there are a few
existing tracepoints (I see block device and jb2) which use dev_t, so
perhaps that would be an option. We'd still want to be able to expose
multiple clocks per device though, either with a separate field or
with a defined packing into this one.

dev_t is a little bit tricky because the packing can (is?) different
between the kernel and C library. major + minor + clock domain as
3 separate fields would be the most explicit.

As the intended use-case is tools, I imagine userspace will want to
link this to data exposed via other APIs, so gpu_id needs to somehow
allow that. That probably means some opaque integer assigned within
the kernel isn't OK.

Hopefully some other vendors have thoughts on what would work in their
systems.

Thanks,
-Brian

> > > + */
> > > +TRACE_EVENT(gpu_frequency,
> > > +
> > > +       TP_PROTO(unsigned int frequency, unsigned int gpu_id),
> > > +
> > > +       TP_ARGS(frequency, gpu_id),
> > > +
> > > +       TP_STRUCT__entry(
> > > +               __field(unsigned int, frequency)
> > > +               __field(unsigned int, gpu_id)
> > > +       ),
> > > +
> > > +       TP_fast_assign(
> > > +               __entry->frequency = frequency;
> > > +               __entry->gpu_id = gpu_id;
> > > +       ),
> > > +
> > > +       TP_printk("frequency=%u gpu_id=%u",
> > > +               __entry->frequency, __entry->gpu_id)
> > > +);
> > >  #endif /* _TRACE_POWER_H */
> > >
> > >  /* This part must be outside protection */
> > > --
> > > 2.29.0.rc1.297.gfa9743e501-goog
> > >
> >
> >
> > Hi there,
> >
> > Per request, re-send this patch with dri-devel@ list CCed.
> >
> > Thanks,
> > Peiyong
> 
> Hi there,
> 
> For GPU drivers folks in dri-devel@ list, any input?
> 
> Thanks,
> Peiyong
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