linux-kernel - Re: [PATCH V4 05/23] ACPI: OSL: Make should_use

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Date:   Wed, 26 Apr 2023 18:47:20 +0200
From:   Björn Töpel <bjorn@...nel.org>
To:     Sunil V L <sunilvl@...tanamicro.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-acpi@...r.kernel.org, linux-crypto@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, llvm@...ts.linux.dev
Cc:     Jonathan Corbet <corbet@....net>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Len Brown <lenb@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Weili Qian <qianweili@...wei.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Marc Zyngier <maz@...nel.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Sunil V L <sunilvl@...tanamicro.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH V4 05/23] ACPI: OSL: Make should_use_kmap() 0 for RISC-V

Sunil V L <sunilvl@...tanamicro.com> writes:

> Without this, if the tables are larger than 4K,
> acpi_map() will fail.
>
> Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/acpi/osl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index 3269a888fb7a..f725813d0cce 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -276,7 +276,7 @@ acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
>  	return NULL;
>  }
>  
> -#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
> +#if defined(CONFIG_IA64) || defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
>  /* ioremap will take care of cache attributes */
>  #define should_use_kmap(pfn)   0

An observation, which can be addressed later; The acpi_os_ioremap()
(called when the config above is enabled for RV), does not have an arch
specific implementation for RISC-V. The generic one calls
ioremap_cached(), which on RISC-V defaults to ioremap() -- caching
disabled/_PAGE_IO.

That is probably not what we want, but rather something similar that
arm64 does.


Björn