Messages in this thread Patch in this message | | | From | dirk.brandewie@gmail ... | Subject | [PATCH v2 2/2] intel_pstate: Set core to min P state during core offline | Date | Fri, 14 Mar 2014 14:03:57 -0700 |
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From: Dirk Brandewie <dirk.j.brandewie@intel.com>
Change to use ->stop() 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> --- drivers/cpufreq/intel_pstate.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 2cd36b9..e9092fd 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -447,7 +447,7 @@ 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 = { @@ -773,16 +773,22 @@ static int intel_pstate_verify_policy(struct cpufreq_policy *policy) return 0; } -static int intel_pstate_cpu_exit(struct cpufreq_policy *policy) +static int intel_pstate_cpu_stop(struct cpufreq_policy *policy) { - int cpu = policy->cpu; + int cpu_num = policy->cpu; + struct cpudata *cpu = all_cpu_data[cpu_num]; + + 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; - del_timer(&all_cpu_data[cpu]->timer); - kfree(all_cpu_data[cpu]); - all_cpu_data[cpu] = NULL; return 0; } + static int intel_pstate_cpu_init(struct cpufreq_policy *policy) { struct cpudata *cpu; @@ -818,7 +824,7 @@ 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 = intel_pstate_cpu_stop, .name = "intel_pstate", }; -- 1.8.3.1
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