forked from luck/tmp_suning_uos_patched
cpufreq: Add stop CPU callback to cpufreq_driver interface
This callback allows the driver to do clean up before the CPU is completely down and its state cannot be modified. This is used by the intel_pstate driver to reduce the requested P state prior to the core going away. This is required because the requested P state of the offline core is used to select the package P state. This effectively sets the floor package P state to the requested P state on the offline core. Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> [rjw: Minor modifications] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -61,7 +61,13 @@ target_index - See below on the differences.
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And optionally
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cpufreq_driver.exit - A pointer to a per-CPU cleanup function.
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cpufreq_driver.exit - A pointer to a per-CPU cleanup
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function called during CPU_POST_DEAD
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phase of cpu hotplug process.
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cpufreq_driver.stop_cpu - A pointer to a per-CPU stop function
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called during CPU_DOWN_PREPARE phase of
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cpu hotplug process.
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cpufreq_driver.resume - A pointer to a per-CPU resume function
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which is called with interrupts disabled
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@ -1337,6 +1337,8 @@ static int __cpufreq_remove_dev_prepare(struct device *dev,
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pr_debug("%s: policy Kobject moved to cpu: %d from: %d\n",
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__func__, new_cpu, cpu);
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}
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} else if (cpufreq_driver->stop_cpu && cpufreq_driver->setpolicy) {
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cpufreq_driver->stop_cpu(policy);
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}
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return 0;
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@ -227,6 +227,7 @@ struct cpufreq_driver {
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int (*bios_limit) (int cpu, unsigned int *limit);
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int (*exit) (struct cpufreq_policy *policy);
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void (*stop_cpu) (struct cpufreq_policy *policy);
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int (*suspend) (struct cpufreq_policy *policy);
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int (*resume) (struct cpufreq_policy *policy);
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struct freq_attr **attr;
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