intel_pstate: Do not set utilization update hook too early
The utilization update hook in the intel_pstate driver is set too early, as it only should be set after the policy has been fully initialized by the core. That may cause intel_pstate_update_util() to use incorrect data and put the CPUs into incorrect P-states as a result. To prevent that from happening, make intel_pstate_set_policy() set the utilization update hook instead of intel_pstate_init_cpu() so intel_pstate_update_util() only runs when all things have been initialized as appropriate. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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539a4c4247
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@ -1103,7 +1103,6 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
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intel_pstate_sample(cpu, 0);
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cpu->update_util.func = intel_pstate_update_util;
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cpufreq_set_update_util_data(cpunum, &cpu->update_util);
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pr_debug("intel_pstate: controlling: cpu %d\n", cpunum);
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@ -1122,18 +1121,29 @@ static unsigned int intel_pstate_get(unsigned int cpu_num)
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return get_avg_frequency(cpu);
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}
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static void intel_pstate_set_update_util_hook(unsigned int cpu)
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{
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cpufreq_set_update_util_data(cpu, &all_cpu_data[cpu]->update_util);
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}
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static void intel_pstate_clear_update_util_hook(unsigned int cpu)
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{
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cpufreq_set_update_util_data(cpu, NULL);
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synchronize_sched();
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}
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static int intel_pstate_set_policy(struct cpufreq_policy *policy)
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{
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if (!policy->cpuinfo.max_freq)
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return -ENODEV;
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intel_pstate_clear_update_util_hook(policy->cpu);
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if (policy->policy == CPUFREQ_POLICY_PERFORMANCE &&
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policy->max >= policy->cpuinfo.max_freq) {
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pr_debug("intel_pstate: set performance\n");
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limits = &performance_limits;
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if (hwp_active)
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intel_pstate_hwp_set(policy->cpus);
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return 0;
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goto out;
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}
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pr_debug("intel_pstate: set powersave\n");
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@ -1163,6 +1173,9 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
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limits->max_perf = div_fp(int_tofp(limits->max_perf_pct),
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int_tofp(100));
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out:
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intel_pstate_set_update_util_hook(policy->cpu);
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if (hwp_active)
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intel_pstate_hwp_set(policy->cpus);
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@ -1187,8 +1200,7 @@ static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
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pr_debug("intel_pstate: CPU %d exiting\n", cpu_num);
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cpufreq_set_update_util_data(cpu_num, NULL);
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synchronize_sched();
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intel_pstate_clear_update_util_hook(cpu_num);
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if (hwp_active)
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return;
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@ -1455,8 +1467,7 @@ out:
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get_online_cpus();
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for_each_online_cpu(cpu) {
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if (all_cpu_data[cpu]) {
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cpufreq_set_update_util_data(cpu, NULL);
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synchronize_sched();
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intel_pstate_clear_update_util_hook(cpu);
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kfree(all_cpu_data[cpu]);
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}
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}
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