[PATCH v1 29/31] fs/resctrl: Add boiler plate for external resctrl code

[James Morse <james.morse@arm.com>]

Add Makefile and Kconfig for fs/resctrl. Add ARCH_HAS_CPU_RESCTRL
for the common parts of the resctrl interface and make X86_CPU_RESCTRL
depend on this.

Signed-off-by: James Morse <james.morse@arm.com>
---
 MAINTAINERS              |  1 +
 arch/Kconfig             |  8 ++++++++
 arch/x86/Kconfig         | 10 +++-------
 fs/Kconfig               |  1 +
 fs/Makefile              |  1 +
 fs/resctrl/Kconfig       | 23 +++++++++++++++++++++++
 fs/resctrl/Makefile      |  3 +++
 fs/resctrl/ctrlmondata.c |  0
 fs/resctrl/internal.h    |  0
 fs/resctrl/monitor.c     |  0
 fs/resctrl/psuedo_lock.c |  0
 fs/resctrl/rdtgroup.c    |  0
 include/linux/resctrl.h  |  4 ++++
 13 files changed, 44 insertions(+), 7 deletions(-)
 create mode 100644 fs/resctrl/Kconfig
 create mode 100644 fs/resctrl/Makefile
 create mode 100644 fs/resctrl/ctrlmondata.c
 create mode 100644 fs/resctrl/internal.h
 create mode 100644 fs/resctrl/monitor.c
 create mode 100644 fs/resctrl/psuedo_lock.c
 create mode 100644 fs/resctrl/rdtgroup.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 5621dd823e79..c49090e9c777 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18543,6 +18543,7 @@ S:	Supported
 F:	Documentation/arch/x86/resctrl*
 F:	arch/x86/include/asm/resctrl.h
 F:	arch/x86/kernel/cpu/resctrl/
+F:	fs/resctrl/
 F:	include/linux/resctrl*.h
 F:	tools/testing/selftests/resctrl/
 
diff --git a/arch/Kconfig b/arch/Kconfig
index fd18b7db2c77..131d874d6738 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1406,6 +1406,14 @@ config STRICT_MODULE_RWX
 config ARCH_HAS_PHYS_TO_DMA
 	bool
 
+config ARCH_HAS_CPU_RESCTRL
+	bool
+	help
+	  The 'resctrl' filesystem allows CPU controls of shared resources
+	  such as caches and memory bandwidth to be configured. An architecture
+	  selects this if it provides the arch-specific hooks for the filesystem
+	  and needs the per-task CLOSID/RMID properties.
+
 config HAVE_ARCH_COMPILER_H
 	bool
 	help
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e071e564452e..cb043543f088 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -479,8 +479,10 @@ config GOLDFISH
 config X86_CPU_RESCTRL
 	bool "x86 CPU resource control support"
 	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
+	depends on MISC_FILESYSTEMS
 	select KERNFS
-	select PROC_CPU_RESCTRL		if PROC_FS
+	select ARCH_HAS_CPU_RESCTRL
+	select RESCTRL_FS
 	select RESCTRL_FS_PSEUDO_LOCK
 	help
 	  Enable x86 CPU resource control support.
@@ -507,12 +509,6 @@ config X86_FRED
 	  ring transitions and exception/interrupt handling if the
 	  system supports.
 
-config RESCTRL_FS_PSEUDO_LOCK
-	bool
-	help
-	  Software mechanism to pin data in a cache portion using
-	  micro-architecture specific knowledge.
-
 if X86_32
 config X86_BIGSMP
 	bool "Support for big SMP systems with more than 8 CPUs"
diff --git a/fs/Kconfig b/fs/Kconfig
index a46b0cbc4d8f..d8a36383b6dc 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -331,6 +331,7 @@ source "fs/omfs/Kconfig"
 source "fs/hpfs/Kconfig"
 source "fs/qnx4/Kconfig"
 source "fs/qnx6/Kconfig"
+source "fs/resctrl/Kconfig"
 source "fs/romfs/Kconfig"
 source "fs/pstore/Kconfig"
 source "fs/sysv/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
index 6ecc9b0a53f2..da6e2d028722 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -129,3 +129,4 @@ obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
 obj-$(CONFIG_EROFS_FS)		+= erofs/
 obj-$(CONFIG_VBOXSF_FS)		+= vboxsf/
 obj-$(CONFIG_ZONEFS_FS)		+= zonefs/
+obj-$(CONFIG_RESCTRL_FS)	+= resctrl/
diff --git a/fs/resctrl/Kconfig b/fs/resctrl/Kconfig
new file mode 100644
index 000000000000..36a1ddbe6c21
--- /dev/null
+++ b/fs/resctrl/Kconfig
@@ -0,0 +1,23 @@
+config RESCTRL_FS
+	bool "CPU Resource Control Filesystem (resctrl)"
+	depends on ARCH_HAS_CPU_RESCTRL
+	select KERNFS
+	select PROC_CPU_RESCTRL               if PROC_FS
+	help
+	  Resctrl is a filesystem interface
+	  to control allocation and
+	  monitoring of system resources
+	  used by the CPUs.
+
+config RESCTRL_FS_PSEUDO_LOCK
+	bool
+	help
+          Software mechanism to pin data in a cache portion using
+          micro-architecture specific knowledge.
+
+config RESCTRL_RMID_DEPENDS_ON_CLOSID
+	bool
+	help
+	  Enable by the architecture when the RMID values depend on the CLOSID.
+	  This causes the closid allocator to search for CLOSID with clean
+	  RMID.
diff --git a/fs/resctrl/Makefile b/fs/resctrl/Makefile
new file mode 100644
index 000000000000..10fcfb0fdb10
--- /dev/null
+++ b/fs/resctrl/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_RESCTRL_FS)		+= rdtgroup.o ctrlmondata.o monitor.o
+obj-$(CONFIG_RESCTRL_FS_PSEUDO_LOCK)	+= psuedo_lock.o
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/psuedo_lock.c b/fs/resctrl/psuedo_lock.c
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5da55e58f229..f786ffceeda3 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -8,6 +8,10 @@
 #include <linux/pid.h>
 #include <linux/resctrl_types.h>
 
+#ifdef CONFIG_ARCH_HAS_CPU_RESCTRL
+#include <asm/resctrl.h>
+#endif
+
 /* CLOSID, RMID value used by the default control group */
 #define RESCTRL_RESERVED_CLOSID		0
 #define RESCTRL_RESERVED_RMID		0
-- 
2.39.2