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ACPI / processor: Introduce apic_id in struct processor to save parsed APIC id 

For cpu hot add, we evaluate _MAT or parse MADT twice to get APIC id,
here is the code logic:
acpi_processor_add()
	acpi_processor_get_info()
		acpi_get_cpuid() will evaluate _MAT or parse MADT;
	acpi_processor_hotadd_init()
		acpi_map_lsapic() will evaluate _MAT again;

This can be done more effectively, this patch introduces apic_id in struct
processor to save parsed APIC id, and then we can use it and remove the
duplicated _MAT evaluation.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jiang Liu 2013-09-02 11:57:34 +08:00 committed by Rafael J. Wysocki
parent 4a10c2ac2f
commit ca9f62ac78
3 changed files with 27 additions and 6 deletions
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4
drivers/acpi/acpi_processor.c
View File

@ -270,7 +270,9 @@ static int acpi_processor_get_info(struct acpi_device *device)
device_declaration = 1;
pr->acpi_id = value;
}
cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
pr->apic_id = acpi_get_apicid(pr->handle, device_declaration,
pr->acpi_id);
cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
/* Handle UP system running SMP kernel, with no LAPIC in MADT */
if (!cpu0_initialized && (cpu_index == -1) &&

26
drivers/acpi/processor_core.c
View File

@ -162,16 +162,23 @@ exit:
return apic_id;
}
int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id)
{
#ifdef CONFIG_SMP
int i;
#endif
int apic_id = -1;
int apic_id;
apic_id = map_mat_entry(handle, type, acpi_id);
if (apic_id == -1)
apic_id = map_madt_entry(type, acpi_id);
return apic_id;
}
int acpi_map_cpuid(int apic_id, u32 acpi_id)
{
#ifdef CONFIG_SMP
int i;
#endif
if (apic_id == -1) {
/*
* On UP processor, there is no _MAT or MADT table.
@ -211,6 +218,15 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
#endif
return -1;
}
int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
int apic_id;
apic_id = acpi_get_apicid(handle, type, acpi_id);
return acpi_map_cpuid(apic_id, acpi_id);
}
EXPORT_SYMBOL_GPL(acpi_get_cpuid);
static bool __init processor_physically_present(acpi_handle handle)

3
include/acpi/processor.h
View File

@ -199,6 +199,7 @@ struct acpi_processor_flags {
struct acpi_processor {
acpi_handle handle;
u32 acpi_id;
u32 apic_id;
u32 id;
u32 pblk;
int performance_platform_limit;
@ -314,6 +315,8 @@ static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
/* in processor_core.c */
void acpi_processor_set_pdc(acpi_handle handle);
int acpi_get_apicid(acpi_handle, int type, u32 acpi_id);
int acpi_map_cpuid(int apic_id, u32 acpi_id);
int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
/* in processor_throttling.c */