Thread (11 messages) 11 messages, 3 authors, 2019-11-28

Re: [PATCH] cpufreq: vexpress-spc: Fix wrong alternation of policy->related_cpus during CPU hp

From: Viresh Kumar <viresh.kumar@linaro.org>
Date: 2019-11-28 02:31:23
Also in: linux-pm, lkml

On 27-11-19, 15:40, Sudeep Holla wrote:
quoted hunk ↗ jump to hunk
diff --git i/arch/arm/mach-vexpress/spc.c w/arch/arm/mach-vexpress/spc.c
index 354e0e7025ae..e0e2e789a0b7 100644
--- i/arch/arm/mach-vexpress/spc.c
+++ w/arch/arm/mach-vexpress/spc.c
@@ -551,8 +551,9 @@ static struct clk *ve_spc_clk_register(struct device *cpu_dev)

 static int __init ve_spc_clk_init(void)
 {
-       int cpu;
+       int cpu, cluster;
        struct clk *clk;
+       bool init_opp_table[MAX_CLUSTERS] = { false };

        if (!info)
                return 0; /* Continue only if SPC is initialised */
@@ -578,8 +579,17 @@ static int __init ve_spc_clk_init(void)
                        continue;
                }

+               cluster = topology_physical_package_id(cpu_dev->id);
+               if (init_opp_table[cluster])
+                       continue;
+
                if (ve_init_opp_table(cpu_dev))
                        pr_warn("failed to initialise cpu%d opp table\n", cpu);
+               else if (dev_pm_opp_set_sharing_cpus(cpu_dev,
+                        topology_core_cpumask(cpu_dev->id)))
+                       pr_warn("failed to mark OPPs shared for cpu%d\n", cpu);
+
+               init_opp_table[cluster] = true;
        }

        platform_device_register_simple("vexpress-spc-cpufreq", -1, NULL, 0);
diff --git i/drivers/cpufreq/vexpress-spc-cpufreq.c w/drivers/cpufreq/vexpress-spc-cpufreq.c
index 506e3f2bf53a..83c85d3d67e3 100644
--- i/drivers/cpufreq/vexpress-spc-cpufreq.c
+++ w/drivers/cpufreq/vexpress-spc-cpufreq.c
@@ -434,7 +434,7 @@ static int ve_spc_cpufreq_init(struct cpufreq_policy *policy)
        if (cur_cluster < MAX_CLUSTERS) {
                int cpu;

-               cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
+               dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus);

                for_each_cpu(cpu, policy->cpus)
                        per_cpu(physical_cluster, cpu) = cur_cluster;
This is a better *work-around* I would say, as we can't break it the
way I explained earlier :)

-- 
viresh

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