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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 select this. Adding an include of asm/resctrl.h to linux/resctrl.h allows the /fs/resctrl files to switch over to using this header instead. Co-developed-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Fenghua Yu <fenghuay@nvidia.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Tested-by: Fenghua Yu <fenghuay@nvidia.com> Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64 Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> Tested-by: Peter Newman <peternewman@google.com> Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64 Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64 Tested-by: Babu Moger <babu.moger@amd.com> Tested-by: Tony Luck <tony.luck@intel.com> Link: https://lore.kernel.org/20250515165855.31452-16-james.morse@arm.com
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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 Some architectures provide hardware facilities to group tasks and monitor and control their usage of memory system resources such as caches and memory bandwidth. Examples of such facilities include Intel's Resource Director Technology (Intel(R) RDT) and AMD's Platform Quality of Service (AMD QoS).
If your system has the necessary support and you want to be able to
assign tasks to groups and manipulate the associated resource
monitors and controls from userspace, say Y here to get a mountable
'resctrl' filesystem that lets you do just that.
If nothing mounts or prods the 'resctrl' filesystem, resource
controls and monitors are left in a quiescent, permissive state.
On architectures where this can be disabled independently, it is
safe to say N.
See <file:Documentation/arch/x86/resctrl.rst> for more information.
config RESCTRL_FS_PSEUDO_LOCK bool depends on RESCTRL_FS help Software mechanism to pin data in a cache portion using micro-architecture specific knowledge.
config RESCTRL_RMID_DEPENDS_ON_CLOSID bool depends on RESCTRL_FS help Enabled by the architecture when the RMID values depend on the CLOSID. This causes the CLOSID allocator to search for CLOSID with clean RMID.