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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: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Zhao Yakui 2009-10-16 09:20:41 +08:00 committed by Len Brown
parent b419148e56
commit d81c45e1c9
3 changed files with 53 additions and 8 deletions
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6
drivers/acpi/processor_core.c
View File

@ -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);

50
drivers/acpi/processor_perflib.c
View File

@ -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

5
include/acpi/processor.h
View File

@ -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) {