From patchwork Tue Jul 7 09:30:23 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: tangchen X-Patchwork-Id: 6731551 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 406EEC05AD for ; Tue, 7 Jul 2015 09:30:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3634720751 for ; Tue, 7 Jul 2015 09:30:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 32AC220709 for ; Tue, 7 Jul 2015 09:30:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756602AbbGGJaY (ORCPT ); Tue, 7 Jul 2015 05:30:24 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:50400 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1754092AbbGGJaS (ORCPT ); Tue, 7 Jul 2015 05:30:18 -0400 X-IronPort-AV: E=Sophos;i="5.13,665,1427731200"; d="scan'208";a="98166909" Received: from unknown (HELO edo.cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 07 Jul 2015 17:34:06 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (localhost.localdomain [127.0.0.1]) by edo.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id t679SUaD014621; Tue, 7 Jul 2015 17:28:30 +0800 Received: from tangchen.g08.fujitsu.local (10.167.226.71) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Tue, 7 Jul 2015 17:30:11 +0800 From: Tang Chen To: , , , , , , , , , , , CC: , , , , , Gu Zheng Subject: [PATCH 3/5] x86, acpi, cpu-hotplug: Introduce apicid_to_cpuid[] array to store persistent cpuid <-> apicid mapping. Date: Tue, 7 Jul 2015 17:30:23 +0800 Message-ID: <1436261425-29881-4-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1436261425-29881-1-git-send-email-tangchen@cn.fujitsu.com> References: <1436261425-29881-1-git-send-email-tangchen@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.71] Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Spam-Status: No, score=-7.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Gu Zheng In this patch, we introduce a new static array named apicid_to_cpuid[], which is large enough to store info for all possible cpus. And then, we modify the cpuid calculation. In generic_processor_info(), it simply finds the next unused cpuid. And it is also why the cpuid <-> nodeid mapping changes with node hotplug. After this patch, we find the next unused cpuid, map it to an apicid, and store the mapping in apicid_to_cpuid[], so that cpuid <-> apicid mapping will be persistent. And finally we will use this array to make cpuid <-> nodeid persistent. cpuid <-> apicid mapping is established at local apic registeration time. But non-present or disabled cpus are ignored. In this patch, we establish all possible cpuid <-> apicid mapping when registering local apic. Signed-off-by: Gu Zheng Signed-off-by: Tang Chen --- arch/x86/include/asm/mpspec.h | 1 + arch/x86/kernel/acpi/boot.c | 6 ++---- arch/x86/kernel/apic/apic.c | 47 ++++++++++++++++++++++++++++++++++++++++--- 3 files changed, 47 insertions(+), 7 deletions(-) diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h index b07233b..db902d8 100644 --- a/arch/x86/include/asm/mpspec.h +++ b/arch/x86/include/asm/mpspec.h @@ -86,6 +86,7 @@ static inline void early_reserve_e820_mpc_new(void) { } #endif int generic_processor_info(int apicid, int version); +int __generic_processor_info(int apicid, int version, bool enabled); #define PHYSID_ARRAY_SIZE BITS_TO_LONGS(MAX_LOCAL_APIC) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index e49ee24..bcc85b2 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -174,15 +174,13 @@ static int acpi_register_lapic(int id, u8 enabled) return -EINVAL; } - if (!enabled) { + if (!enabled) ++disabled_cpus; - return -EINVAL; - } if (boot_cpu_physical_apicid != -1U) ver = apic_version[boot_cpu_physical_apicid]; - return generic_processor_info(id, ver); + return __generic_processor_info(id, ver, enabled); } static int __init diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index a9c9830..c744ffb 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1977,7 +1977,38 @@ void disconnect_bsp_APIC(int virt_wire_setup) apic_write(APIC_LVT1, value); } -static int __generic_processor_info(int apicid, int version, bool enabled) +/* + * Logic cpu number(cpuid) to local APIC id persistent mappings. + * Do not clear the mapping even if cpu is hot-removed. + */ +static int apicid_to_cpuid[] = { + [0 ... NR_CPUS - 1] = -1, +}; + +/* + * Internal cpu id bits, set the bit once cpu present, and never clear it. + */ +static cpumask_t cpuid_mask = CPU_MASK_NONE; + +static int get_cpuid(int apicid) +{ + int free_id, i; + + free_id = cpumask_next_zero(-1, &cpuid_mask); + if (free_id >= nr_cpu_ids) + return -1; + + for (i = 0; i < free_id; i++) + if (apicid_to_cpuid[i] == apicid) + return i; + + apicid_to_cpuid[free_id] = apicid; + cpumask_set_cpu(free_id, &cpuid_mask); + + return free_id; +} + +int __generic_processor_info(int apicid, int version, bool enabled) { int cpu, max = nr_cpu_ids; bool boot_cpu_detected = physid_isset(boot_cpu_physical_apicid, @@ -2058,8 +2089,18 @@ static int __generic_processor_info(int apicid, int version, bool enabled) * for BSP. */ cpu = 0; - } else - cpu = cpumask_next_zero(-1, cpu_present_mask); + } else { + cpu = get_cpuid(apicid); + if (cpu < 0) { + int thiscpu = max + disabled_cpus; + + pr_warning(" Processor %d/0x%x ignored.\n", + thiscpu, apicid); + if (enabled) + disabled_cpus++; + return -EINVAL; + } + } /* * Validate version