linux-kernel - Re: [PATCH V3 06/20] RISC-V: Add support to build the ACPI core

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Date:   Sat, 4 Mar 2023 15:38:27 +0100
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        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>,
        Atish Patra <atishp@...osinc.com>,
        'Conor Dooley ' <conor.dooley@...rochip.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH V3 06/20] RISC-V: Add support to build the ACPI core

On Fri, Mar 03, 2023 at 04:36:17PM +0100, Andrew Jones wrote:
> On Fri, Mar 03, 2023 at 07:06:33PM +0530, Sunil V L wrote:
> > Enable ACPI core for RISC-V after adding architecture-specific
> > interfaces and header files required to build the ACPI core.
> > 
> > 1) Couple of header files are required unconditionally by the ACPI
> > core. Add empty acenv.h and cpu.h header files.
> > 
> > 2) If CONFIG_PCI is enabled, a few PCI related interfaces need to
> > be provided by the architecture. Define dummy interfaces for now
> > so that build succeeds. Actual implementation will be added when
> > PCI support is added for ACPI along with external interrupt
> > controller support.
> > 
> > 3) A few globals and memory mapping related functions specific
> > to the architecture need to be provided.
> > 
> > Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> > ---
> >  arch/riscv/Kconfig             |  5 +++
> >  arch/riscv/include/asm/acenv.h | 11 +++++
> >  arch/riscv/include/asm/acpi.h  | 61 ++++++++++++++++++++++++++
> >  arch/riscv/include/asm/cpu.h   |  8 ++++
> >  arch/riscv/kernel/Makefile     |  2 +
> >  arch/riscv/kernel/acpi.c       | 80 ++++++++++++++++++++++++++++++++++
> >  6 files changed, 167 insertions(+)
> >  create mode 100644 arch/riscv/include/asm/acenv.h
> >  create mode 100644 arch/riscv/include/asm/acpi.h
> >  create mode 100644 arch/riscv/include/asm/cpu.h
> >  create mode 100644 arch/riscv/kernel/acpi.c
> > 
> > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> > index 71754eb32ee6..f3108c7e19d8 100644
> > --- a/arch/riscv/Kconfig
> > +++ b/arch/riscv/Kconfig
> > @@ -12,6 +12,8 @@ config 32BIT
> >  
> >  config RISCV
> >  	def_bool y
> > +	select ACPI_GENERIC_GSI if ACPI
> > +	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
> >  	select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
> >  	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
> >  	select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
> > @@ -617,6 +619,7 @@ config EFI
> >  	depends on OF && !XIP_KERNEL
> >  	depends on MMU
> >  	default y
> > +	select ARCH_SUPPORTS_ACPI if 64BIT
> >  	select EFI_GENERIC_STUB
> >  	select EFI_PARAMS_FROM_FDT
> >  	select EFI_RUNTIME_WRAPPERS
> > @@ -720,3 +723,5 @@ source "drivers/cpufreq/Kconfig"
> >  endmenu # "CPU Power Management"
> >  
> >  source "arch/riscv/kvm/Kconfig"
> > +
> > +source "drivers/acpi/Kconfig"
> 
> The above Kconfig hunks don't apply on the IPI improvement base. The
> second hunk also looks weird with the select under the default.
> 

Just following up here; as Sunil pointed out in chat, the base is
latest master with the IPI improvement rebased. I was using the
last IPI improvement branch. So that explains the problem I had
applying this and the weirdness I was seeing with the Kconfig
lines (select/default) as compared to v2.

Thanks,
drew