linux-kernel - Re: [PATCH v3 0/9] Updates of HiSilicon Uncore L3C PMU

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Message-ID: <54fb6d7e-3c42-4dff-9bc7-b98cba75e3e1@huawei.com>
Date: Thu, 11 Sep 2025 21:22:27 +0800
From: wangyushan <wangyushan12@...wei.com>
To: <will@...nel.org>, <mark.rutland@....com>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC: <robin.murphy@....com>, <yangyicong@...wei.com>,
	<Jonathan.Cameron@...wei.com>, <liuyonglong@...wei.com>,
	<wanghuiqiang@...wei.com>, <prime.zeng@...ilicon.com>,
	<hejunhao3@...artners.com>, <fanghao11@...wei.com>, Linuxarm
	<linuxarm@...wei.com>
Subject: Re: [PATCH v3 0/9] Updates of HiSilicon Uncore L3C PMU

A gentle ping...

On 8/29/2025 6:14 PM, Yushan Wang wrote:
> Support new version of L3C PMU, which supports extended events space
> which can be controlled in up to 2 extra address spaces with separate
> overflow interrupts.  The layout of the control/event registers are kept
> the same.  The extended events with original ones together cover the
> monitoring job of all transactions on L3C.
>
> That's said, the driver supports finer granual statistics of L3 cache
> with separated and dedicated PMUs, and a new option `ext` to give a
> hint of to which part should perf counting command be delivered.
>
> The extended events is specified with `ext=[1|2]` option for the driver
> to distinguish:
>
> perf stat -e hisi_sccl0_l3c0_0/event=<event_id>,ext=<ext>/
>
> Currently only event option using config bit [7, 0]. There's still
> plenty unused space. Make ext using config [16, 17] and reserve
> bit [15, 8] for event option for future extension.
>
> With the capability of extra counters, number of counters for HiSilicon
> uncore PMU could reach up to 24, the usedmap is extended accordingly.
>
> The hw_perf_event::event_base is initialized to the base MMIO address
> of the event and will be used for later control, overflow handling and
> counts readout.
>
> We still make use of the Uncore PMU framework for handling the events
> and interrupt migration on CPU hotplug. The framework's cpuhp callback
> will handle the event migration and interrupt migration of orginial
> event, if PMU supports extended events then the interrupt of extended
> events is migrated to the same CPU choosed by the framework.
>
> A new HID of HISI0215 is used for this version of L3C PMU.
>
> Some necessary refactor is included, allowing the framework to cope with
> the new version of driver.
>
> Depends-on: drivers/perf: hisi: Add support for HiSilicon NOC and MN PMU driver
> Depends-on: Message-ID: <20250717121727.61057-1-yangyicong@...wei.com>
>
> ---
>
> Changes:
>
> v2 -> v3:
>    - Refactor made for better readability.
>    - Fixed failure examination in cpu offline callback.
>    - Some minor reword of documentation, and droped subsection titles as
>      suggested by Yicong.
>    - Link to v2: https://lore.kernel.org/all/20250821135049.2010220-1-wangyushan12@huawei.com/
>
> v1 -> v2:
>    - Don't call disable_irq() and simply return success when there is no
>      CPU available for irq migration.
>    - Documentation patch split.
>    - Fix of a few other issues etc. per Jonathan.
>    - Link to v1: https://lore.kernel.org/all/20250729153823.2026154-1-wangyushan12@huawei.com/
>
> Yicong Yang (7):
>    drivers/perf: hisi: Relax the event ID check in the framework
>    drivers/perf: hisi: Export hisi_uncore_pmu_isr()
>    drivers/perf: hisi: Simplify the probe process of each L3C PMU version
>    drivers/perf: hisi: Extract the event filter check of L3C PMU
>    drivers/perf: hisi: Extend the field of tt_core
>    drivers/perf: hisi: Refactor the event configuration of L3C PMU
>    drivers/perf: hisi: Add support for L3C PMU v3
>
> Yushan Wang (2):
>    Documentation: hisi-pmu: Fix of minor format error
>    Documentation: hisi-pmu: Add introduction to HiSilicon V3 PMU
>
>   Documentation/admin-guide/perf/hisi-pmu.rst  |  38 +-
>   drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c | 528 +++++++++++++++----
>   drivers/perf/hisilicon/hisi_uncore_pmu.c     |   5 +-
>   drivers/perf/hisilicon/hisi_uncore_pmu.h     |   6 +-
>   4 files changed, 481 insertions(+), 96 deletions(-)
>