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ACPI : Update T-state coordination after getting _TSD info

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Accordint to ACPI spec, the _TSD object provides T-state control cross
logical processor dependency information to OSPM.
After the _TSD data for all cpus are obtained, OSPM will set up
the T-state coordination between CPUs.

Of course if the _TSD doesn't exist or _TSD data is incorrect , it is
assumed that there is no T-state coordination and T-state is changed
independently.

Now there is no proper solution to update T-state coordination after
one cpu is hotplugged. So this patch won't support hotplugged cpu very well.

Signed-off-by: Zhao Yakui <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Zhao Yakui 2008-01-28 13:53:42 +08:00 • committed by Len Brown
commit 1180509f6b
3 changed files with 184 additions and 2 deletions
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4
include/acpi/processor.h
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@ -176,6 +176,8 @@ struct acpi_processor_throttling {
u32 address;
u8 duty_offset;
u8 duty_width;
u8 tsd_valid_flag;
unsigned int shared_type;
struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
};
@ -316,7 +318,7 @@ static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
int acpi_processor_get_throttling_info(struct acpi_processor *pr);
extern int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
extern struct file_operations acpi_processor_throttling_fops;
extern void acpi_processor_throttling_init(void);
/* in processor_idle.c */
int acpi_processor_power_init(struct acpi_processor *pr,
struct acpi_device *device);