This adds Kconfig/Makefile to build hardware prefetch control driver
for x86 support. This also adds a MAINTAINERS entry.
Signed-off-by: Kohei Tarumizu <tarumizu.kohei@xxxxxxxxxxx>
---
MAINTAINERS | 1 +
arch/x86/Kconfig | 17 +++++++++++++++++
arch/x86/kernel/cpu/Makefile | 2 ++
3 files changed, 20 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index b3e920a8a044..4f44bbef2614 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8623,6 +8623,7 @@ K: (devm_)?hwmon_device_(un)?register(|_with_groups|_with_info)
HARDWARE PREFETCH CONTROL DRIVERS
M: Kohei Tarumizu <tarumizu.kohei@xxxxxxxxxxx>
S: Maintained
+F: arch/x86/kernel/cpu/x86-pfctl.c
F: drivers/soc/fujitsu/a64fx-pfctl.c
HARDWARE RANDOM NUMBER GENERATOR CORE
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4bed3abf444d..3ee173483f9f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1359,6 +1359,23 @@ config X86_CPUID
with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
/dev/cpu/31/cpuid.
+config X86_HWPF_CONTROL
+ tristate "x86 Hardware Prefetch Control support"
+ depends on X86_64
+ help
+ This provides a sysfs interface to control the Hardware Prefetch
+ behavior for X86.
+
+ Some Intel processors have MSR 0x1a4 (MSR_MISC_FEATURE_CONTROL),
+ which can control the hardware prefech behavior. If the processor
+ supports this, the module can be loaded with the name x86-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.
+
choice
prompt "High Memory Support"
default HIGHMEM4G
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 9661e3e802be..1aa13dad17a3 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -56,6 +56,8 @@ obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o
obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o
obj-$(CONFIG_ACRN_GUEST) += acrn.o
+obj-$(CONFIG_X86_HWPF_CONTROL) += x86-pfctl.o
+
ifdef CONFIG_X86_FEATURE_NAMES
quiet_cmd_mkcapflags = MKCAP $@
cmd_mkcapflags = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $@ $^
--
2.27.0
