linux-kernel - [PATCH v4 0/1] RISC-V: Create unique identification for SoC PMU

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Message-Id: <20220619111115.6354-1-nikita.shubin@maquefel.me>
Date:   Sun, 19 Jun 2022 14:11:10 +0300
From:   Nikita Shubin <nikita.shubin@...uefel.me>
To:     Atish Patra <atishp@...shpatra.org>, Will Deacon <will@...nel.org>,
        Sunil V L <sunilvl@...tanamicro.com>
Cc:     João Mário Domingos 
        <joao.mario@...nico.ulisboa.pt>, linux@...ro.com,
        Nikita Shubin <n.shubin@...ro.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Mark Rutland <mark.rutland@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v4 0/1] RISC-V: Create unique identification for SoC PMU

From: Nikita Shubin <n.shubin@...ro.com>

Provide RISC-V SBI PMU id to distinguish different cores or SoCs via
"devices/platform/riscv-pmu/id" sysfs entry.

As per Will Deacon recomendation i am splitting the original series in parts,
first one is to provide a reasonable id for RISC-V SBI PMU. Events for Unmatched,
general RISCV and SBI Firmware bindings will be added later.

We can provide the PMU id as is marchid, mimpid, mvendorid as string, separated by a coma:

cat /sys/devices/platform/riscv-pmu/id 
0x70032,0x70032,0x0

In this case we are providing them as is as given by SBI extension.

Also i've added a string allocated on probe with pmuid, to avoid excess ecalls.

Atish would do you think about this ?

Sunil, thank you for reporting issue with 32-bit, i decided to make another approuch to problem.

Link: https://patchwork.kernel.org/project/linux-riscv/list/?series=648017
---
v3->v4:
- split series
- fix DEVICE_ATTR to use octal permissions
- use string for pmuid, instead of incoding some magical numbers
---
Nikita Shubin (1):
  RISC-V: Create unique identification for SoC PMU

 drivers/perf/riscv_pmu_sbi.c   | 41 ++++++++++++++++++++++++++++++++++
 include/linux/perf/riscv_pmu.h |  1 +
 2 files changed, 42 insertions(+)

-- 
2.35.1