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CPPC: Probe for CPPC tables for each ACPI Processor object

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For each detected ACPI Processor object (ACPI0007), search its
device handle for CPPC specific tables (i.e. _CPC) and extract
CPU specific performance capabilities.

Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Reviewed-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ashwin Chaugule 2015-09-09 16:27:07 -04:00 committed by Rafael J. Wysocki
parent 56cdc2a05c
commit 4f2f757351
2 changed files with 20 additions and 0 deletions
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6
drivers/acpi/processor_driver.c
View file

@ -242,6 +242,10 @@ static int __acpi_processor_start(struct acpi_device *device)
if (pr->flags.need_hotplug_init)
return 0;
result = acpi_cppc_processor_probe(pr);
if (result)
return -ENODEV;
if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
acpi_processor_power_init(pr);
@ -287,6 +291,8 @@ static int acpi_processor_stop(struct device *dev)
acpi_pss_perf_exit(pr, device);
acpi_cppc_processor_exit(pr);
return 0;
}

14
include/acpi/processor.h
View file

@ -311,6 +311,20 @@ phys_cpuid_t acpi_get_phys_id(acpi_handle, int type, u32 acpi_id);
int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id);
int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
#ifdef CONFIG_ACPI_CPPC_LIB
extern int acpi_cppc_processor_probe(struct acpi_processor *pr);
extern void acpi_cppc_processor_exit(struct acpi_processor *pr);
#else
static inline int acpi_cppc_processor_probe(struct acpi_processor *pr)
{
return 0;
}
static inline void acpi_cppc_processor_exit(struct acpi_processor *pr)
{
return;
}
#endif /* CONFIG_ACPI_CPPC_LIB */
/* in processor_pdc.c */
void acpi_processor_set_pdc(acpi_handle handle);