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ACPI / processor: Make it possible to get APIC ID via GIC

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Introduce a new function map_gic_id() to allow APIC IDs to be obtained
from the GIC Structure introduced by ACPI 5.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
[rjw: Subject and changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hanjun Guo 2014-02-19 00:23:56 +08:00 committed by Rafael J. Wysocki
parent 2c4fa0033a
commit df86f5df79
1 changed files with 27 additions and 0 deletions
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27
drivers/acpi/processor_core.c
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@ -71,6 +71,28 @@ static int map_lsapic_id(struct acpi_subtable_header *entry,
return 0;
}
static int map_gic_id(struct acpi_subtable_header *entry,
int device_declaration, u32 acpi_id, int *apic_id)
{
struct acpi_madt_generic_interrupt *gic =
(struct acpi_madt_generic_interrupt *)entry;
if (!(gic->flags & ACPI_MADT_ENABLED))
return -ENODEV;
/*
* In the GIC interrupt model, logical processors are
* required to have a Processor Device object in the DSDT,
* so we should check device_declaration here
*/
if (device_declaration && (gic->uid == acpi_id)) {
*apic_id = gic->gic_id;
return 0;
}
return -EINVAL;
}
static int map_madt_entry(int type, u32 acpi_id)
{
unsigned long madt_end, entry;
@ -106,6 +128,9 @@ static int map_madt_entry(int type, u32 acpi_id)
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
if (!map_lsapic_id(header, type, acpi_id, &apic_id))
break;
} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
if (!map_gic_id(header, type, acpi_id, &apic_id))
break;
}
entry += header->length;
}
@ -136,6 +161,8 @@ static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
map_lapic_id(header, acpi_id, &apic_id);
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
map_lsapic_id(header, type, acpi_id, &apic_id);
} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
map_gic_id(header, type, acpi_id, &apic_id);
}
exit: