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Commit bb18008f authored by Dirk Brandewie's avatar Dirk Brandewie Committed by Rafael J. Wysocki
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intel_pstate: Set core to min P state during core offline 



Change to use the new ->stop_cpu() callback to do clean up during CPU
hotplug. The requested P state for an offline core will be used by the
hardware coordination function to select the package P state. If the
core is under load when it is offlined it will fix the package P state
floor to the requested P state of offline core.

Reported-by: default avatarPatrick Marlier <patrick.marlier@gmail.com>
Signed-off-by: default avatarDirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 367dc4aa

drivers/cpufreq/intel_pstate.c

+11 −8
Original line number Diff line number Diff line
@@ -446,7 +446,7 @@ static void core_set_pstate(struct cpudata *cpudata, int pstate) 
	if (limits.no_turbo)

		val |= (u64)1 << 32;



	wrmsrl(MSR_IA32_PERF_CTL, val);

	wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);

}



static struct cpu_defaults core_params = {
@@ -771,14 +771,17 @@ static int intel_pstate_verify_policy(struct cpufreq_policy *policy) 
	return 0;

}



static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)

static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)

{

	int cpu = policy->cpu;

	int cpu_num = policy->cpu;

	struct cpudata *cpu = all_cpu_data[cpu_num];



	del_timer(&all_cpu_data[cpu]->timer);

	kfree(all_cpu_data[cpu]);

	all_cpu_data[cpu] = NULL;

	return 0;

	pr_info("intel_pstate CPU %d exiting\n", cpu_num);



	del_timer(&all_cpu_data[cpu_num]->timer);

	intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);

	kfree(all_cpu_data[cpu_num]);

	all_cpu_data[cpu_num] = NULL;

}



static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
@@ -816,7 +819,7 @@ static struct cpufreq_driver intel_pstate_driver = { 
	.setpolicy	= intel_pstate_set_policy,

	.get		= intel_pstate_get,

	.init		= intel_pstate_cpu_init,

	.exit		= intel_pstate_cpu_exit,

	.stop_cpu	= intel_pstate_stop_cpu,

	.name		= "intel_pstate",

};