linux-kernel - Re: [PATCH v2 5/8] arm64: Create cache sysfs directory without ACPI PPTT for hardware prefetch control

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Date:   Wed, 30 Mar 2022 17:14:49 -0500
From:   Rob Herring <robh@...nel.org>
To:     Kohei Tarumizu <tarumizu.kohei@...itsu.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/8] arm64: Create cache sysfs directory without ACPI
 PPTT for hardware prefetch control

On Fri, Mar 11, 2022 at 4:23 AM Kohei Tarumizu
<tarumizu.kohei@...itsu.com> wrote:
>
> This patch create a cache sysfs directory without ACPI PPTT if the
> CONFIG_HWPF_CONTROL is true.
>
> Hardware prefetch control driver need cache sysfs directory and cache
> level/type information. In ARM processor, these information can be
> obtained from the register even without PPTT.

What registers? CCSIDR register is no longer used. You must use DT or PPTT.

> Therefore, we set the
> cpu_map_populated to true to create cache sysfs directory if the
> machine doesn't have PPTT.
>
> Signed-off-by: Kohei Tarumizu <tarumizu.kohei@...itsu.com>
> ---
>  arch/arm64/kernel/cacheinfo.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)