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| author | Hanjun Guo <hanjun.guo@linaro.org> | 2014-02-19 00:23:56 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-02-19 00:53:15 +0100 |
| commit | df86f5df79d8c2035a88fb985925e49475c0cdca (patch) | |
| tree | 9ce2511aa3c90d0bb57914bc6282af973d28a31c /drivers/acpi | |
| parent | 2c4fa0033ad5dc0ca291528cfa8b23debaf2e32e (diff) | |
| download | linux-df86f5df79d8c2035a88fb985925e49475c0cdca.tar.gz linux-df86f5df79d8c2035a88fb985925e49475c0cdca.tar.bz2 linux-df86f5df79d8c2035a88fb985925e49475c0cdca.zip | |
ACPI / processor: Make it possible to get APIC ID via GIC
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>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/processor_core.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 4d91b32423a9..f1dd404463aa 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -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: |