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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: Patrick Marlier <patrick.marlier@gmail.com>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dirk Brandewie 2014-03-19 08:45:54 -07:00 committed by Rafael J. Wysocki
parent 367dc4aa93
commit bb18008f80
1 changed files with 11 additions and 8 deletions
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19
drivers/cpufreq/intel_pstate.c
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@ -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",
};