From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756545AbaBRQZF (ORCPT ); Tue, 18 Feb 2014 11:25:05 -0500 Received: from mail-pd0-f177.google.com ([209.85.192.177]:55169 "EHLO mail-pd0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755948AbaBRQZB (ORCPT ); Tue, 18 Feb 2014 11:25:01 -0500 From: Hanjun Guo To: "Rafael J. Wysocki" Cc: Lan Tianyu , Joe Perches , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, patches@linaro.org, linux-kernel@vger.kernel.org, linaro-acpi@lists.linaro.org, Hanjun Guo Subject: [PATCH v5 3/5] ACPI / processor: Introduce map_gic_id() to get apic id from MADT or _MAT method Date: Wed, 19 Feb 2014 00:23:56 +0800 Message-Id: <1392740638-2479-4-git-send-email-hanjun.guo@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1392740638-2479-1-git-send-email-hanjun.guo@linaro.org> References: <1392740638-2479-1-git-send-email-hanjun.guo@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Get apic id from MADT or _MAT method is not implemented on arm/arm64, and ACPI 5.0 introduces GIC Structure for it, so this patch introduces map_gic_id() to get apic id followed the ACPI 5.0 spec. Signed-off-by: Hanjun Guo --- drivers/acpi/processor_core.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 4dcf776..d316d9b 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -71,6 +71,27 @@ 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 +127,9 @@ 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 +160,8 @@ 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: -- 1.7.9.5