linux-kernel - Re: [PATCH V3 00/20] Add basic ACPI support for RISC-V

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Message-ID: <CAFiDJ5-7qY2vQvbcTU7QPLmqrbCmXWkCxmswO4OqeYtsNOiOFw@mail.gmail.com>
Date:   Wed, 19 Apr 2023 16:07:30 +0800
From:   Ley Foon Tan <lftan@...nel.org>
To:     Atish Kumar Patra <atishp@...osinc.com>
Cc:     Sunil V L <sunilvl@...tanamicro.com>,
        Conor Dooley <conor@...nel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-acpi@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-doc@...r.kernel.org, Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Anup Patel <apatel@...tanamicro.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Conor Dooley <conor.dooley@...rochip.com>, llvm@...ts.linux.dev
Subject: Re: [PATCH V3 00/20] Add basic ACPI support for RISC-V

On Thu, Apr 6, 2023 at 10:45 AM Atish Kumar Patra <atishp@...osinc.com> wrote:
>

> > >
> > > Hi Sunil
> > >
> > > One question regarding PMU in ACPI flow.
> > >
> > > We use DT to decode the supported HPM counters/events for the
> > > different platforms now.
> > > How do we enable PMU (drivers/perf/riscv_pmu_sbi.c) when using ACPI method?
> > > Note, this might be in separate patch series.
> > >
> > Hi Lay Foon,
> >
> > This driver uses SBI calls and hence should work in case of ACPI also.
> >
> > There is one minor change required in this driver for overflow
> > interrupt. I have a patch for that in future series.
>
> Just to add further clarification: OpenSBI will continue to use the
> device tree so that
> the firmware will have access to all the PMU details.
>
Sorry for the late reply, missed out on this email in my kernel.org mailbox.

Do you mean OpenSBI still using the device tree, but EDK II and Linux
using the ACPI table? Normally Linux shouldn't mix between ACPI and
device tree.

Regards
Ley Foon