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Message-Id: <20240614150033.10454-29-james.morse@arm.com>
Date: Fri, 14 Jun 2024 15:00:23 +0000
From: James Morse <james.morse@....com>
To: x86@...nel.org,
linux-kernel@...r.kernel.org
Cc: Fenghua Yu <fenghua.yu@...el.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
H Peter Anvin <hpa@...or.com>,
Babu Moger <Babu.Moger@....com>,
James Morse <james.morse@....com>,
shameerali.kolothum.thodi@...wei.com,
D Scott Phillips OS <scott@...amperecomputing.com>,
carl@...amperecomputing.com,
lcherian@...vell.com,
bobo.shaobowang@...wei.com,
tan.shaopeng@...itsu.com,
baolin.wang@...ux.alibaba.com,
Jamie Iles <quic_jiles@...cinc.com>,
Xin Hao <xhao@...ux.alibaba.com>,
peternewman@...gle.com,
dfustini@...libre.com,
amitsinght@...vell.com,
David Hildenbrand <david@...hat.com>,
Rex Nie <rex.nie@...uarmicro.com>,
Dave Martin <dave.martin@....com>,
Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: [PATCH v3 28/38] x86/resctrl: Claim get_domain_from_cpu() for resctrl
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@....com>
Tested-by: Peter Newman <peternewman@...gle.com>
Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.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 | 21 +++++++++++++++++++++
5 files changed, 23 insertions(+), 18 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index d932e03f129f..258e0a945f87 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -343,21 +343,6 @@ static void cat_wrmsr(struct msr_param *m)
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;
-
- lockdep_assert_cpus_held();
-
- 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;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index fc837d144894..bad103f20663 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -454,7 +454,6 @@ 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 a09f5ed929d3..145bd05eafa5 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -687,7 +687,7 @@ 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 8066d0e51a73..74edf83a3eec 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4171,7 +4171,7 @@ 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 e07d719ace33..d67225f95ee1 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>
@@ -330,6 +331,26 @@ 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;
+
+ lockdep_assert_cpus_held();
+
+ 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;
+}
+
/*
* Update the ctrl_val and apply this config right now.
* Must be called on one of the domain's CPUs.
--
2.39.2
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