linux-kernel - Re: [PATCH v1 -next 0/3] RISC-V: ACPI: Enable CPPC based cpufreq support

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Date: Tue, 19 Mar 2024 15:50:21 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: Drew Fustini <drew@...7.com>
Cc: linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Atish Kumar Patra <atishp@...osinc.com>,
	Anup Patel <apatel@...tanamicro.com>
Subject: Re: [PATCH v1 -next 0/3] RISC-V: ACPI: Enable CPPC based cpufreq
 support

On Mon, Mar 18, 2024 at 07:27:34PM -0700, Drew Fustini wrote:
> On Mon, Mar 18, 2024 at 11:40:34AM -0700, Drew Fustini wrote:
> > On Thu, Feb 08, 2024 at 09:14:11AM +0530, Sunil V L wrote:
> > > This series enables the support for "Collaborative Processor Performance
> > > Control (CPPC) on ACPI based RISC-V platforms. It depends on the
> > > encoding of CPPC registers as defined in RISC-V FFH spec [2].
> > > 
> > > CPPC is described in the ACPI spec [1]. RISC-V FFH spec required to
> > > enable this, is available at [2].
> > > 
> > > [1] - https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control.html#collaborative-processor-performance-control
> > > [2] - https://github.com/riscv-non-isa/riscv-acpi-ffh/releases/download/v1.0.0/riscv-ffh.pdf
> > > 
> > > The series is based on the LPI support series.
> > > Based-on: 20240118062930.245937-1-sunilvl@...tanamicro.com
> > > (https://lore.kernel.org/lkml/20240118062930.245937-1-sunilvl@ventanamicro.com/)
> > 
> > Should the https://github.com/vlsunil/qemu/tree/lpi_exp branch also be
> > used for this CPPC series too?
> 
> I noticed the ventanamicro qemu repo has a dev-upstream branch [1] which
> contains 4bb6ba4d0fb9 ("riscv/virt: acpi: Enable CPPC - _CPC and _PSD").
> I've built that but I still see 'SBI CPPC extension NOT detected!!' in
> the Linux boot log.
> 
> I'm using upstream opensbi. It seems that sbi_cppc_probe() fails because
> cppc_dev is not set. Nothing in the upstream opensbi repo seems to call
> sbi_cppc_set_device(), so I am uncertain how it is possible for it to
> work. Is there an opensbi branch I should be using?
> 
> Thanks,
> Drew
> 
> [1] https://github.com/ventanamicro/qemu/tree/dev-upstream

Please use below branches for qemu and opensbi. These are just dummy
objects/interfaces added to test the kernel change which are otherwise
platform specific features.

https://github.com/vlsunil/qemu/tree/lpi_cppc_exp
https://github.com/vlsunil/opensbi/tree/cppc_exp

Regards
Sunil