arm64: mpam: Select ARCH_HAS_CPU_RESCTRL

Enough MPAM support is present to enable ARCH_HAS_CPU_RESCTRL.  Let it
rip^Wlink!

ARCH_HAS_CPU_RESCTRL indicates resctrl can be enabled. It is enabled by the
arch code simply because it has 'arch' in its name.

This removes ARM_CPU_RESCTRL as a mimic of X86_CPU_RESCTRL.  While here,
move the ACPI dependency to the driver's Kconfig file.

Tested-by: Gavin Shan <gshan@redhat.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Zeng Heng <zengheng4@huawei.com>
Tested-by: Punit Agrawal <punit.agrawal@oss.qualcomm.com>
Tested-by: Jesse Chick <jessechick@os.amperecomputing.com>
Reviewed-by: Zeng Heng <zengheng4@huawei.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Co-developed-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>

Author: James Morse

arch/arm64/Kconfig

@@ -2017,7 +2017,7 @@ config ARM64_TLB_RANGE
 config ARM64_MPAM
 	bool "Enable support for MPAM"
 	select ARM64_MPAM_DRIVER
-	select ACPI_MPAM if ACPI
+	select ARCH_HAS_CPU_RESCTRL
 	help
 	  Memory System Resource Partitioning and Monitoring (MPAM) is an
 	  optional extension to the Arm architecture that allows each

arch/arm64/include/asm/resctrl.h

@@ -0,0 +1,2 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/arm_mpam.h>

drivers/resctrl/Kconfig

@@ -1,6 +1,7 @@
 menuconfig ARM64_MPAM_DRIVER
 	bool "MPAM driver"
 	depends on ARM64 && ARM64_MPAM
+	select ACPI_MPAM if ACPI
 	help
 	  Memory System Resource Partitioning and Monitoring (MPAM) driver for
 	  System IP, e.g. caches and memory controllers.
@@ -22,3 +23,9 @@ config MPAM_KUNIT_TEST
 	  If unsure, say N.
 
 endif
+
+config ARM64_MPAM_RESCTRL_FS
+	bool
+	default y if ARM64_MPAM_DRIVER && RESCTRL_FS
+	select RESCTRL_RMID_DEPENDS_ON_CLOSID
+	select RESCTRL_ASSIGN_FIXED

drivers/resctrl/Makefile

@@ -1,5 +1,5 @@
 obj-$(CONFIG_ARM64_MPAM_DRIVER)			+= mpam.o
 mpam-y						+= mpam_devices.o
-mpam-$(CONFIG_ARM_CPU_RESCTRL)			+= mpam_resctrl.o
+mpam-$(CONFIG_ARM64_MPAM_RESCTRL_FS)		+= mpam_resctrl.o
 
 ccflags-$(CONFIG_ARM64_MPAM_DRIVER_DEBUG)	+= -DDEBUG