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From:   Ley Foon Tan <lftan@kernel.org>
Date:   Wed, 19 Apr 2023 16:07:30 +0800
Message-ID: <CAFiDJ5-7qY2vQvbcTU7QPLmqrbCmXWkCxmswO4OqeYtsNOiOFw@mail.gmail.com>
Subject: Re: [PATCH V3 00/20] Add basic ACPI support for RISC-V
To:     Atish Kumar Patra <atishp@rivosinc.com>
Cc:     Sunil V L <sunilvl@ventanamicro.com>,
        Conor Dooley <conor@kernel.org>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        linux-acpi@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-doc@vger.kernel.org, Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Marc Zyngier <maz@kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Anup Patel <apatel@ventanamicro.com>,
        Andrew Jones <ajones@ventanamicro.com>,
        Conor Dooley <conor.dooley@microchip.com>, llvm@lists.linux.dev
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On Thu, Apr 6, 2023 at 10:45=E2=80=AFAM Atish Kumar Patra <atishp@rivosinc.=
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 m=
ethod?
> > > 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