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| author | Zhang Rui <rui.zhang@intel.com> | 2008-01-17 15:51:23 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-02-01 23:18:19 -0500 |
| commit | d9460fd227ed2ce52941b6a12ad4de05c195f6aa (patch) | |
| tree | 1fb877cf41c8599e0fc9c1fbf902b88baba60708 /include/acpi | |
| parent | 05a83d972293f39a66bc2aa409a5e7996bba585d (diff) | |
| download | linux-d9460fd227ed2ce52941b6a12ad4de05c195f6aa.tar.gz | |
ACPI: register ACPI Processor as generic thermal cooling device
Register ACPI processor as thermal cooling devices. A combination of processor T-state and P-state are used for thermal throttling. the processor will reduce the frequency first and then set the T-state. we use cpufreq_thermal_reduction_pctg to calculate the cpufreq limit, and call cpufreq_verify_with_limit to set the cpufreq limit. if cpufreq driver is loaded, then we have four cooling state for cpufreq control. cooling state 0: cpufreq limit == max_freq cooling state 1: cpufreq limit == max_freq * 80% cooling state 2: cpufreq limit == max_freq * 60% cooling state 3: cpufreq limit == max_freq * 40% after the cpufreq limit is set to 40 percentage of the max_freq, we use T-state for cooling. eg. a processor has P-state support, and it has 8 T-state (T0-T7), the max_state of the proceesor is 10: state cpufreq-limit T-state 0: max_freq T0 1: max_freq * 80% T0 2: max_freq * 60% T0 3: max_freq * 40% T0 4: max_freq * 40% T1 5: max_freq * 40% T2 6: max_freq * 40% T3 7: max_freq * 40% T4 8: max_freq * 40% T5 9: max_freq * 40% T6 10: max_freq * 40% T7 Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Thomas Sujith <sujith.thomas@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'include/acpi')
| -rw-r--r-- | include/acpi/processor.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 76411b1fc4fd..0787635a11aa 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -4,7 +4,7 @@ #include <linux/kernel.h> #include <linux/cpu.h> #include <linux/cpuidle.h> - +#include <linux/thermal.h> #include <asm/acpi.h> #define ACPI_PROCESSOR_BUSY_METRIC 10 @@ -218,7 +218,7 @@ struct acpi_processor { struct acpi_processor_performance *performance; struct acpi_processor_throttling throttling; struct acpi_processor_limit limit; - + struct thermal_cooling_device *cdev; /* the _PDC objects for this processor, if any */ struct acpi_object_list *pdc; }; @@ -330,7 +330,7 @@ extern struct cpuidle_driver acpi_idle_driver; /* in processor_thermal.c */ int acpi_processor_get_limit_info(struct acpi_processor *pr); extern struct file_operations acpi_processor_limit_fops; - +extern struct thermal_cooling_device_ops processor_cooling_ops; #ifdef CONFIG_CPU_FREQ void acpi_thermal_cpufreq_init(void); void acpi_thermal_cpufreq_exit(void); |