linux-kernel - Re: [PATCH v5 2/6] soc: fujitsu: Add Kconfig/Makefile to build hardware prefetch control driver

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Message-ID: <7b76ac34-1c50-c0da-9bf3-d05bdd9959cb@infradead.org>
Date:   Tue, 7 Jun 2022 07:40:46 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Kohei Tarumizu <tarumizu.kohei@...itsu.com>,
        catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, rafael@...nel.org, lenb@...nel.org,
        gregkh@...uxfoundation.org, mchehab+huawei@...nel.org,
        eugenis@...gle.com, tony.luck@...el.com, pcc@...gle.com,
        peterz@...radead.org, marcos@...a.pet, marcan@...can.st,
        linus.walleij@...aro.org, nicolas.ferre@...rochip.com,
        conor.dooley@...rochip.com, arnd@...db.de, ast@...nel.org,
        peter.chen@...nel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v5 2/6] soc: fujitsu: Add Kconfig/Makefile to build
 hardware prefetch control driver



On 6/7/22 05:05, Kohei Tarumizu wrote:
> diff --git a/drivers/soc/fujitsu/Kconfig b/drivers/soc/fujitsu/Kconfig
> new file mode 100644
> index 000000000000..6c5990b75cc5
> --- /dev/null
> +++ b/drivers/soc/fujitsu/Kconfig
> @@ -0,0 +1,26 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +menu "Fujitsu SoC drivers"
> +
> +config ALLOW_INCOMPLETE_CACHE_SYSFS
> +	bool
> +
> +config A64FX_HWPF_CONTROL
> +	tristate "A64FX Hardware Prefetch Control driver"
> +	depends on ARM64
> +	select ALLOW_INCOMPLETE_CACHE_SYSFS
> +	help
> +	  This provides a sysfs interface to control the Hardware Prefetch
> +	  behavior for A64FX.
> +
> +	  A64FX has IMP_PF_STREAM_DETECT_CTRL_EL0, which can control the
> +	  hardware prefech behavior. If the processor supports this, the

	           prefetch

> +	  module can be loaded with the name a64fx-pfctl.
> +
> +	  Depending on the characteristics of the application, this register
> +	  parameters improve or degrade performance.
> +
> +	  Please see Documentation/ABI/testing/sysfs-devices-system-cpu for
> +	  more information.

-- 
~Randy