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>
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 9ab109c..bcb9a6d 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -446,7 +446,7 @@
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 @@
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 @@
.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",
};