From: Hanjun Guo <hanjun.guo@linaro.org>
Date: Wed, 26 Mar 2014 00:36:23 +0000 (+0800)
Subject: Revert "ACPI / processor: Make it possible to get APIC ID via GIC"
X-Git-Tag: MMI-PSA29.97-13-9~12483^2~2^2
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3e9eac50cdcac71a74ca4a8cb587799f474ca62d;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

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

Revert commit df86f5df79d8 (ACPI / processor: Make it possible to get
APIC ID via GIC).

APIC ID refers the hardware ID of the CPU, which means MPIDR on
ARM/ARM64, but in ACPI 5.0, GIC ID feild in GIC structure have
no explicit definition and may not refer to the MPIDR.

Commit df86f5df79d8 assumed that gic->gic_id as MPIDR which may not be
the case, so revert it until the explicit definition of GIC structure
is ready.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index f1dd404463aa..4d91b32423a9 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -71,28 +71,6 @@ 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;
@@ -128,9 +106,6 @@ 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;
 	}
@@ -161,8 +136,6 @@ 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: