[PATCH v1 25/31] x86/resctrl: Claim get_domain_from_cpu() for resctrl

James Morse
2024-03-21T16:52:50Z

get_domain_from_cpu() is a handy helper that both the arch code and
resctrl need to use. Rename it resctrl_get_domain_from_cpu() so it
gets moved out to /fs, and exported back to the arch code.

Signed-off-by: James Morse <james.morse@arm.com>
---
arch/x86/kernel/cpu/resctrl/core.c | 15 +--------------
arch/x86/kernel/cpu/resctrl/internal.h | 1 -
arch/x86/kernel/cpu/resctrl/monitor.c | 2 +-
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 2 +-
include/linux/resctrl.h | 19 +++++++++++++++++++
5 files changed, 22 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 7cdecd8ac00b..f94ad04023c3 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -355,19 +355,6 @@ cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
}

-struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
-{
- struct rdt_domain *d;
-
- list_for_each_entry(d, &r->domains, list) {
- /* Find the domain that contains this CPU */
- if (cpumask_test_cpu(cpu, &d->cpu_mask))
- return d;
- }
-
- return NULL;
-}
-
u32 resctrl_arch_get_num_closid(struct rdt_resource *r)
{
return resctrl_to_arch_res(r)->num_closid;
@@ -381,7 +368,7 @@ void rdt_ctrl_update(void *arg)
int cpu = smp_processor_id();
struct rdt_domain *d;

- d = get_domain_from_cpu(cpu, r);
+ d = resctrl_get_domain_from_cpu(cpu, r);
if (d) {
hw_res->msr_update(d, m, r);
return;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index e849d4407769..3a3962736061 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -452,7 +452,6 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
unsigned long cbm);
enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
int rdtgroup_tasks_assigned(struct rdtgroup *r);
-struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
int closids_supported(void);
void closid_free(int closid);
int alloc_rmid(u32 closid);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 287fb0a5f060..8b316d9acc3b 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -676,7 +676,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
idx = resctrl_arch_rmid_idx_encode(closid, rmid);
pmbm_data = &dom_mbm->mbm_local[idx];

- dom_mba = get_domain_from_cpu(smp_processor_id(), r_mba);
+ dom_mba = resctrl_get_domain_from_cpu(smp_processor_id(), r_mba);
if (!dom_mba) {
pr_warn_once("Failure to get domain for MBA update\n");
return;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 702a94fad6db..085fb9c2333a 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4165,7 +4165,7 @@ void resctrl_offline_cpu(unsigned int cpu)
if (!l3->mon_capable)
goto out_unlock;

- d = get_domain_from_cpu(cpu, l3);
+ d = resctrl_get_domain_from_cpu(cpu, l3);
if (d) {
if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
cancel_delayed_work(&d->mbm_over);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 73c111963433..84420253dc05 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -2,6 +2,7 @@
#ifndef _RESCTRL_H
#define _RESCTRL_H

+#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/pid.h>
@@ -273,6 +274,24 @@ static inline u32 resctrl_get_config_index(u32 closid,
}
}

+/*
+ * Caller must hold the cpuhp read lock to prevent the struct rdt_domain being
+ * freed.
+ */
+static inline struct rdt_domain *
+resctrl_get_domain_from_cpu(int cpu, struct rdt_resource *r)
+{
+ struct rdt_domain *d;
+
+ list_for_each_entry_rcu(d, &r->domains, list) {
+ /* Find the domain that contains this CPU */
+ if (cpumask_test_cpu(cpu, &d->cpu_mask))
+ return d;
+ }
+
+ return NULL;
+}
+
/*
* Update the ctrl_val and apply this config right now.
* Must be called on one of the domain's CPUs.
--
2.39.2