linux-kernel - Re: [PATCH v3 1/6] Documentation: perf: hisi: Documentation for HiSilicon SoC PMU driver

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Date:   Wed, 19 Jul 2017 17:17:48 +0800
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Shaokun Zhang <zhangshaokun@...ilicon.com>
CC:     <mark.rutland@....com>, <will.deacon@....com>,
        <linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v3 1/6] Documentation: perf: hisi: Documentation for
 HiSilicon SoC PMU driver

On Tue, 18 Jul 2017 15:59:54 +0800
Shaokun Zhang <zhangshaokun@...ilicon.com> wrote:

> This patch adds documentation for the uncore PMUs on HiSilicon SoC.
> 
> Signed-off-by: Shaokun Zhang <zhangshaokun@...ilicon.com>
> Signed-off-by: Anurup M <anurup.m@...wei.com>  
Hi Shaokun,

Sorry for the late reply on this (only recently joined Huawei)

This is a fairly generic review of the code rather than going into
the actual userspace ABI choices as this is an area I'm only just
starting to become familiar with.

Thanks,

Jonathan
> ---
>  Documentation/perf/hisi-pmu.txt | 51 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
>  create mode 100644 Documentation/perf/hisi-pmu.txt
> 
> diff --git a/Documentation/perf/hisi-pmu.txt b/Documentation/perf/hisi-pmu.txt
> new file mode 100644
> index 0000000..5fa0b1a
> --- /dev/null
> +++ b/Documentation/perf/hisi-pmu.txt
> @@ -0,0 +1,51 @@
> +HiSilicon SoC uncore Performance Monitoring Unit (PMU)
> +======================================================
> +The HiSilicon SoC chip comprehends various independent system device PMUs
> +such as L3 cache (L3C), Hydra Home Agent (HHA) and DDRC. These PMUs are
> +independent and have hardware logic to gather statistics and performance
> +information.
> +
> +HiSilicon SoC encapsulates multiple CPU and IO dies. Each CPU cluster (CC
> +L) is made up of 4 cpu cores sharing one L3 cache; Each CPU die is called  
nitpick, I'd not have a line break mid acronym. 

> +Super CPU cluster (SCCL) and is made up of 6 CCLs. Each SCCL has two HHAs
> +(0 - 1) and four DDRCs (0 - 3), respectively.
> +
> +HiSilicon SoC uncore PMU driver
> +---------------------------------------
> +Each device PMU has separate registers for event counting, control and
> +interrupt, and the PMU driver shall register perf PMU drivers like L3C,
> +HHA and DDRC etc. The available events and configuration options shall
> +be described in the sysfs, see /sys/devices/hisi_*.  
Is there not a subsystem directory that would make more sense to
refer to than the full device list?

> +The "perf list" command shall list the available events from sysfs.
> +
> +Each L3C, HHA and DDRC in one SCCL are registered as an separate PMU with perf.
> +The PMU name will appear in event listing as hisi_module <index-id>_<sccl-id>.
> +where "index-id" is the index of module and "sccl-id" is the identifier of
> +the SCCL.
> +e.g. hisi_l3c0_1/rd_hit_cpipe is READ_HIT_CPIPE event of L3C index #0 and SCCL
> +ID #1.
> +e.g. hisi_hha0_1/rx_operations is RX_OPERATIONS event of HHA index #0 and SCCL
> +ID #1.
> +
> +The driver also provides a "cpumask" sysfs attribute, which shows the CPU core
> +ID used to count the uncore PMU event.
> +
> +Example usage of perf:
> +$# perf list
> +hisi_l3c0_3/rd_hit_cpipe/ [kernel PMU event]
> +------------------------------------------
> +hisi_l3c0_3/wr_hit_cpipe/ [kernel PMU event]
> +------------------------------------------
> +hisi_l3c0_1/rd_hit_cpipe/ [kernel PMU event]
> +------------------------------------------
> +hisi_l3c0_1/wr_hit_cpipe/ [kernel PMU event]
> +------------------------------------------
> +
> +$# perf stat -a -e hisi_l3c0_1/rd_hit_cpipe/ sleep 5
> +$# perf stat -a -e hisi_l3c0_1/config=0x02/ sleep 5
> +
> +The current driver does not support sampling. So "perf record" is unsupported.
> +Also attach to a task is unsupported as the events are all uncore.
> +
> +Note: Please contact the maintainer for a complete list of events supported for
> +the PMU devices in the SoC and its information if needed.  


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