Commit 5f05586c authored by Ashwin Chaugule's avatar Ashwin Chaugule Committed by Rafael J. Wysocki
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ACPI: Decouple ACPI idle and ACPI processor drivers 



This patch introduces a new Kconfig symbol, ACPI_PROCESSOR_IDLE,
which is auto selected by architectures which support the ACPI
based C states for CPU Idle management.

The processor_idle driver in its present form contains declarations
specific to X86 and IA64. Since there are no reasonable defaults
for other architectures e.g. ARM64, the driver is selected only for
X86 or IA64.

This helps in decoupling the ACPI processor_driver from the ACPI
processor_idle driver which is useful for the upcoming alternative
patchwork for controlling CPU Performance (CPPC) and CPU Idle (LPI).

Signed-off-by: default avatarAshwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 239708a3

drivers/acpi/Kconfig

+5 −1
Original line number Diff line number Diff line
@@ -193,10 +193,14 @@ config ACPI_CPU_FREQ_PSS 
	bool

	select THERMAL



config ACPI_PROCESSOR_IDLE

	bool

	select CPU_IDLE



config ACPI_PROCESSOR

	tristate "Processor"

	depends on X86 || IA64

	select CPU_IDLE

	select ACPI_PROCESSOR_IDLE

	select ACPI_CPU_FREQ_PSS

	default y

	help

drivers/acpi/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -80,7 +80,8 @@ obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o 
obj-$(CONFIG_ACPI_BGRT)		+= bgrt.o



# processor has its own "processor." module_param namespace

processor-y			:= processor_driver.o processor_idle.o

processor-y			:= processor_driver.o

processor-$(CONFIG_ACPI_PROCESSOR_IDLE) += processor_idle.o

processor-$(CONFIG_ACPI_CPU_FREQ_PSS)	+= processor_throttling.o	\

	processor_thermal.o

processor-$(CONFIG_CPU_FREQ)	+= processor_perflib.o

include/acpi/processor.h

+24 −2
Original line number Diff line number Diff line
@@ -355,13 +355,35 @@ static inline void acpi_processor_throttling_init(void) {} 
#endif	/* CONFIG_ACPI_CPU_FREQ_PSS */



/* in processor_idle.c */

extern struct cpuidle_driver acpi_idle_driver;

#ifdef CONFIG_ACPI_PROCESSOR_IDLE

int acpi_processor_power_init(struct acpi_processor *pr);

int acpi_processor_power_exit(struct acpi_processor *pr);

int acpi_processor_cst_has_changed(struct acpi_processor *pr);

int acpi_processor_hotplug(struct acpi_processor *pr);

extern struct cpuidle_driver acpi_idle_driver;

#else

static inline int acpi_processor_power_init(struct acpi_processor *pr)

{

	return -ENODEV;

}



static inline int acpi_processor_power_exit(struct acpi_processor *pr)

{

	return -ENODEV;

}



static inline int acpi_processor_cst_has_changed(struct acpi_processor *pr)

{

	return -ENODEV;

}



static inline int acpi_processor_hotplug(struct acpi_processor *pr)

{

	return -ENODEV;

}

#endif /* CONFIG_ACPI_PROCESSOR_IDLE */



#ifdef CONFIG_PM_SLEEP

#if defined(CONFIG_PM_SLEEP) & defined(CONFIG_ACPI_PROCESSOR_IDLE)

void acpi_processor_syscore_init(void);

void acpi_processor_syscore_exit(void);

#else

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