[PATCH v8 12/21] x86/resctrl: Move the filesystem bits to headers visible to fs/resctrl

James Morse
2025-04-11T16:43:56Z

Once the filesystem parts of resctrl move to fs/resctrl, it cannot rely
on definitions in x86's internal.h.

Move definitions in internal.h that need to be shared between the
filesystem and architecture code to header files that fs/resctrl can
include.

Doing this separately means the filesystem code only moves between files
of the same name, instead of having these changes mixed in too.

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>
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>
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>
---
Changes since v6:
* Moved resctrl_arch_set_cdp_enabled() to rdtgroup.c instead of core.c

Changes since v3:
* Changed the number of hyphens at the end of the commit message.

Changes since v2:
* Dropped the rfflags and some other defines from being moved.

Changes since v1:
* Revert apparently unintentional duplication of a couple of variable
declarations in <linux/resctrl.h>.

No functional change.
---
arch/x86/include/asm/resctrl.h | 3 +++
arch/x86/kernel/cpu/resctrl/internal.h | 9 ---------
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 +++++
include/linux/resctrl_types.h | 3 +++
4 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 7a39728b0743..6eb7d5c94c7a 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -210,6 +210,9 @@ int resctrl_arch_measure_l2_residency(void *_plr);
int resctrl_arch_measure_l3_residency(void *_plr);
void resctrl_cpu_detect(struct cpuinfo_x86 *c);

+bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l);
+int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
+
#else

static inline void resctrl_arch_sched_in(struct task_struct *tsk) {}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 365d5697a6ae..866b9fec5a11 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -16,8 +16,6 @@
#define CQM_LIMBOCHECK_INTERVAL 1000

#define MBM_CNTR_WIDTH_BASE 24
-#define MBM_OVERFLOW_INTERVAL 1000
-#define MAX_MBA_BW 100u
#define MBA_IS_LINEAR 0x4
#define MBM_CNTR_WIDTH_OFFSET_AMD 20

@@ -410,13 +408,6 @@ extern struct rdtgroup rdtgroup_default;
extern struct dentry *debugfs_resctrl;
extern enum resctrl_event_id mba_mbps_default_event;

-static inline bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
-{
- return rdt_resources_all[l].cdp_enabled;
-}
-
-int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
-
void arch_mon_domain_online(struct rdt_resource *r, struct rdt_mon_domain *d);

/* CPUID.(EAX=10H, ECX=ResID=1).EAX */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 23fd92cc0c56..25dc94cb8e88 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2536,6 +2536,11 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
return 0;
}

+bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
+{
+ return rdt_resources_all[l].cdp_enabled;
+}
+
/*
* We don't allow rdtgroup directories to be created anywhere
* except the root directory. Thus when looking for the rdtgroup
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
index 654323066174..a7faf2cd5406 100644
--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -7,6 +7,9 @@
#ifndef __LINUX_RESCTRL_TYPES_H
#define __LINUX_RESCTRL_TYPES_H

+#define MAX_MBA_BW 100u
+#define MBM_OVERFLOW_INTERVAL 1000
+
/* Reads to Local DRAM Memory */
#define READS_TO_LOCAL_MEM BIT(0)

--
2.20.1