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| author | Dirk Brandewie <dirk.j.brandewie@intel.com> | 2014-03-19 08:45:54 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-03-20 04:04:40 +0100 |
| commit | bb18008f8086283f8f03e8e50fbbf17f213b9ea9 (patch) | |
| tree | ec63fd8378f40fe59fae85671d0fd69f118df125 /drivers/cpufreq/intel_pstate.c | |
| parent | 367dc4aa932bfb33a3189064d33f7890a8ec1ca8 (diff) | |
| download | lwn-bb18008f8086283f8f03e8e50fbbf17f213b9ea9.tar.gz lwn-bb18008f8086283f8f03e8e50fbbf17f213b9ea9.zip | |
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>
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 9ab109c0f90c..bcb9a6d0ae11 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -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", }; |