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

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Date:   Tue,  7 Jun 2022 21:05:26 +0900
From:   Kohei Tarumizu <tarumizu.kohei@...itsu.com>
To:     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
Cc:     tarumizu.kohei@...itsu.com
Subject: [PATCH v5 2/6] soc: fujitsu: Add Kconfig/Makefile to build hardware prefetch control driver

Adds Kconfig/Makefile to build hardware prefetch control driver for
A64FX support, and also adds a MAINTAINERS entry.

Signed-off-by: Kohei Tarumizu <tarumizu.kohei@...itsu.com>
---
 MAINTAINERS                  |  5 +++++
 drivers/soc/Kconfig          |  1 +
 drivers/soc/Makefile         |  1 +
 drivers/soc/fujitsu/Kconfig  | 26 ++++++++++++++++++++++++++
 drivers/soc/fujitsu/Makefile |  2 ++
 5 files changed, 35 insertions(+)
 create mode 100644 drivers/soc/fujitsu/Kconfig
 create mode 100644 drivers/soc/fujitsu/Makefile

diff --git a/MAINTAINERS b/MAINTAINERS
index d6d879cb0afd..b3e920a8a044 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8620,6 +8620,11 @@ F:	include/linux/hwmon*.h
 F:	include/trace/events/hwmon*.h
 K:	(devm_)?hwmon_device_(un)?register(|_with_groups|_with_info)
 
+HARDWARE PREFETCH CONTROL DRIVERS
+M:	Kohei Tarumizu <tarumizu.kohei@...itsu.com>
+S:	Maintained
+F:	drivers/soc/fujitsu/a64fx-pfctl.c
+
 HARDWARE RANDOM NUMBER GENERATOR CORE
 M:	Matt Mackall <mpm@...enic.com>
 M:	Herbert Xu <herbert@...dor.apana.org.au>
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index c5aae42673d3..d87754799d90 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -9,6 +9,7 @@ source "drivers/soc/atmel/Kconfig"
 source "drivers/soc/bcm/Kconfig"
 source "drivers/soc/canaan/Kconfig"
 source "drivers/soc/fsl/Kconfig"
+source "drivers/soc/fujitsu/Kconfig"
 source "drivers/soc/imx/Kconfig"
 source "drivers/soc/ixp4xx/Kconfig"
 source "drivers/soc/litex/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 904eec2a7871..6c8ff1792cda 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_SOC_CANAAN)	+= canaan/
 obj-$(CONFIG_ARCH_DOVE)		+= dove/
 obj-$(CONFIG_MACH_DOVE)		+= dove/
 obj-y				+= fsl/
+obj-y				+= fujitsu/
 obj-$(CONFIG_ARCH_GEMINI)	+= gemini/
 obj-y				+= imx/
 obj-y				+= ixp4xx/
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
+	  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.
+
+endmenu
diff --git a/drivers/soc/fujitsu/Makefile b/drivers/soc/fujitsu/Makefile
new file mode 100644
index 000000000000..35e284a548bb
--- /dev/null
+++ b/drivers/soc/fujitsu/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_A64FX_HWPF_CONTROL)	+= a64fx-pfctl.o
-- 
2.27.0