Commit d81c45e1 authored by Zhao Yakui's avatar Zhao Yakui Committed by Len Brown
Browse files

ACPI: Notify the _PPC evaluation status to the platform 



According to the ACPI spec(section 8.4.4.3) OSPM should convey the _PPC
evaluations status to the platform if there exists the _OST object.
The _OST contains two arguments:
	The first is the PERFORMANCE notificatin event.
	The second is the status of _PPC object.
OSPM will convey the _PPC evaluation status to the platform.
Of course when the module parameter of "ignore_ppc" is added, OSPM won't
evaluate the _PPC object. But it will call the _OST object.

At the same time the _OST object will be evaluated only when the PERFORMANCE
notification event is received.

Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent b419148e

drivers/acpi/processor_core.c

+3 −3
Original line number Diff line number Diff line
@@ -722,7 +722,7 @@ static void acpi_processor_notify(struct acpi_device *device, u32 event) 
	switch (event) {

	case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:

		saved = pr->performance_platform_limit;

		acpi_processor_ppc_has_changed(pr);

		acpi_processor_ppc_has_changed(pr, 1);

		if (saved == pr->performance_platform_limit)

			break;

		acpi_bus_generate_proc_event(device, event,
@@ -758,7 +758,7 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb, 
	struct acpi_processor *pr = per_cpu(processors, cpu);



	if (action == CPU_ONLINE && pr) {

		acpi_processor_ppc_has_changed(pr);

		acpi_processor_ppc_has_changed(pr, 0);

		acpi_processor_cst_has_changed(pr);

		acpi_processor_tstate_has_changed(pr);

	}
@@ -830,7 +830,7 @@ static int acpi_processor_add(struct acpi_device *device) 
	arch_acpi_processor_cleanup_pdc(pr);



#ifdef CONFIG_CPU_FREQ

	acpi_processor_ppc_has_changed(pr);

	acpi_processor_ppc_has_changed(pr, 0);

#endif

	acpi_processor_get_throttling_info(pr);

	acpi_processor_get_limit_info(pr);

drivers/acpi/processor_perflib.c

+47 −3
Original line number Diff line number Diff line
@@ -152,15 +152,59 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 
	return 0;

}



int acpi_processor_ppc_has_changed(struct acpi_processor *pr)

#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE	0x80

/*

 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status

 * @handle: ACPI processor handle

 * @status: the status code of _PPC evaluation

 *	0: success. OSPM is now using the performance state specificed.

 *	1: failure. OSPM has not changed the number of P-states in use

 */

static void acpi_processor_ppc_ost(acpi_handle handle, int status)

{

	union acpi_object params[2] = {

		{.type = ACPI_TYPE_INTEGER,},

		{.type = ACPI_TYPE_INTEGER,},

	};

	struct acpi_object_list arg_list = {2, params};

	acpi_handle temp;



	params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;

	params[1].integer.value =  status;



	/* when there is no _OST , skip it */

	if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))

		return;



	acpi_evaluate_object(handle, "_OST", &arg_list, NULL);

	return;

}



int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)

{

	int ret;



	if (ignore_ppc)

	if (ignore_ppc) {

		/*

		 * Only when it is notification event, the _OST object

		 * will be evaluated. Otherwise it is skipped.

		 */

		if (event_flag)

			acpi_processor_ppc_ost(pr->handle, 1);

		return 0;

	}



	ret = acpi_processor_get_platform_limit(pr);



	/*

	 * Only when it is notification event, the _OST object

	 * will be evaluated. Otherwise it is skipped.

	 */

	if (event_flag) {

		if (ret < 0)

			acpi_processor_ppc_ost(pr->handle, 1);

		else

			acpi_processor_ppc_ost(pr->handle, 0);

	}

	if (ret < 0)

		return (ret);

	else

include/acpi/processor.h

+3 −2
Original line number Diff line number Diff line
@@ -294,7 +294,7 @@ static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx 
#ifdef CONFIG_CPU_FREQ

void acpi_processor_ppc_init(void);

void acpi_processor_ppc_exit(void);

int acpi_processor_ppc_has_changed(struct acpi_processor *pr);

int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag);

#else

static inline void acpi_processor_ppc_init(void)

{
@@ -304,7 +304,8 @@ static inline void acpi_processor_ppc_exit(void) 
{

	return;

}

static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr)

static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr,

								int event_flag)

{

	static unsigned int printout = 1;

	if (printout) {

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