linux-kernel - [PATCH v10 01/13] x86/resctrl: Replace smp_call_function_many() with on_each_cpu

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Message-ID: <20221222233127.910538-2-babu.moger@amd.com>
Date:   Thu, 22 Dec 2022 17:31:15 -0600
From:   Babu Moger <babu.moger@....com>
To:     <corbet@....net>, <reinette.chatre@...el.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC:     <fenghua.yu@...el.com>, <dave.hansen@...ux.intel.com>,
        <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
        <akpm@...ux-foundation.org>, <quic_neeraju@...cinc.com>,
        <rdunlap@...radead.org>, <damien.lemoal@...nsource.wdc.com>,
        <songmuchun@...edance.com>, <peterz@...radead.org>,
        <jpoimboe@...nel.org>, <pbonzini@...hat.com>, <babu.moger@....com>,
        <chang.seok.bae@...el.com>, <pawan.kumar.gupta@...ux.intel.com>,
        <jmattson@...gle.com>, <daniel.sneddon@...ux.intel.com>,
        <sandipan.das@....com>, <tony.luck@...el.com>,
        <james.morse@....com>, <linux-doc@...r.kernel.org>,
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        <eranian@...gle.com>, <christophe.leroy@...roup.eu>,
        <jarkko@...nel.org>, <adrian.hunter@...el.com>,
        <quic_jiles@...cinc.com>, <peternewman@...gle.com>
Subject: [PATCH v10 01/13] x86/resctrl: Replace smp_call_function_many() with on_each_cpu_mask()

on_each_cpu_mask() runs the function on each CPU specified by cpumask,
which may include the local processor.

Replace smp_call_function_many() with on_each_cpu_mask() to simplify
the code.

Signed-off-by: Babu Moger <babu.moger@....com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 11 +++------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 29 +++++++----------------
 2 files changed, 11 insertions(+), 29 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 1df0e3262bca..7eece3d2d0c3 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -310,7 +310,6 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 	enum resctrl_conf_type t;
 	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
-	int cpu;
 	u32 idx;
 
 	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
@@ -341,13 +340,9 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 
 	if (cpumask_empty(cpu_mask))
 		goto done;
-	cpu = get_cpu();
-	/* Update resource control msr on this CPU if it's in cpu_mask. */
-	if (cpumask_test_cpu(cpu, cpu_mask))
-		rdt_ctrl_update(&msr_param);
-	/* Update resource control msr on other CPUs. */
-	smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1);
-	put_cpu();
+
+	/* Update resource control msr on all the CPUs. */
+	on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);
 
 done:
 	free_cpumask_var(cpu_mask);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index e5a48f05e787..e4e6cdc1ee62 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -325,12 +325,7 @@ static void update_cpu_closid_rmid(void *info)
 static void
 update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)
 {
-	int cpu = get_cpu();
-
-	if (cpumask_test_cpu(cpu, cpu_mask))
-		update_cpu_closid_rmid(r);
-	smp_call_function_many(cpu_mask, update_cpu_closid_rmid, r, 1);
-	put_cpu();
+	on_each_cpu_mask(cpu_mask, update_cpu_closid_rmid, r, 1);
 }
 
 static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
@@ -1864,13 +1859,9 @@ static int set_cache_qos_cfg(int level, bool enable)
 			/* Pick one CPU from each domain instance to update MSR */
 			cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
 	}
-	cpu = get_cpu();
-	/* Update QOS_CFG MSR on this cpu if it's in cpu_mask. */
-	if (cpumask_test_cpu(cpu, cpu_mask))
-		update(&enable);
-	/* Update QOS_CFG MSR on all other cpus in cpu_mask. */
-	smp_call_function_many(cpu_mask, update, &enable, 1);
-	put_cpu();
+
+	/* Update QOS_CFG MSR on all the CPUs in cpu_mask */
+	on_each_cpu_mask(cpu_mask, update, &enable, 1);
 
 	free_cpumask_var(cpu_mask);
 
@@ -2347,7 +2338,7 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	struct msr_param msr_param;
 	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
-	int i, cpu;
+	int i;
 
 	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
 		return -ENOMEM;
@@ -2368,13 +2359,9 @@ static int reset_all_ctrls(struct rdt_resource *r)
 		for (i = 0; i < hw_res->num_closid; i++)
 			hw_dom->ctrl_val[i] = r->default_ctrl;
 	}
-	cpu = get_cpu();
-	/* Update CBM on this cpu if it's in cpu_mask. */
-	if (cpumask_test_cpu(cpu, cpu_mask))
-		rdt_ctrl_update(&msr_param);
-	/* Update CBM on all other cpus in cpu_mask. */
-	smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1);
-	put_cpu();
+
+	/* Update CBM on all the CPUs in cpu_mask */
+	on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);
 
 	free_cpumask_var(cpu_mask);
 
-- 
2.34.1