From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932505Ab2KNCdm (ORCPT ); Tue, 13 Nov 2012 21:33:42 -0500 Received: from mga14.intel.com ([143.182.124.37]:3412 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932423Ab2KNCdk (ORCPT ); Tue, 13 Nov 2012 21:33:40 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.83,247,1352102400"; d="scan'208";a="217413881" From: "Fenghua Yu" To: "Ingo Molnar" , "Thomas Gleixner" , "H Peter Anvin" , "Linus Torvalds" , "Andrew Morton" , "Asit K Mallick" , "Tony Luck" , "Arjan Dan De Ven" , "Suresh B Siddha" , "Len Brown" , "Srivatssa S. Bhat" , "Randy Dunlap" , "Rafael J. Wysocki" , "Chen Gong" , "linux-kernel" , "linux-pm" , "x86" Cc: "Fenghua Yu" Subject: [PATCH v10 0/14] x86: Arbitrary CPU hot(un)plug support Date: Tue, 13 Nov 2012 11:32:37 -0800 Message-Id: <1352835171-3958-1-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 1.7.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Fenghua Yu CPU0 or BSP (Bootstrap Processor) has been the last processor that can not be hot removed on x86. This patchset implements CPU0 or BSP online and offline and removes this obstacle to CPU hotplug. RAS needs the feature. If socket0 needs to be hotplugged for any reason (any thread on socket0 is bad, shared cache issue, uncore issue, etc), CPU0 is required to be offline or hot replaced to keep the system run. For example, starting with Core Duo, if you have a system that is reporting cache problems via the "yellow" status in the MCi_STATUS msr, then there is benefit in simply soft off-lining the cores that share that cache - assuming that leaves you at least one online core. A single socket system with L3 cache troubles is not helped - but problems in L1/L2 cache, or on multi-socket systems can be avoided. They are already being avoided for the cases where CPU0 is not involved. This patchset can help L1/L2 cache problem in CPU0 or L3 cache problem on the socket with CPU0 in a multi-socket system. v10: Use first online CPU to handle retriggered irq in ioapic. Correct cpu0_logical_apicid for x2apic. Add wakeup_cpu_via_init_nmi() to make code more readable. Add ENDPROC(start_cpu0). Add comment for pm_notifier priority in cpu_hotplug_pm_callback. v9: Add Intel vendor check to support the feature on Intel platforms only. v8: Add smp_store_boot_cpu_info() and change smp_store_cpu_info() back to avoid a compilation error. Fix a few messy subject issues. v7: Change smp_store_cpu_info() to allow store cpuinfo for CPU0 when online. Change PIC irq detection in native_cpu_disable(). v6: If CPU0 is offlined during boot time in CPU0 hotplug debug mode, put CPU0 online again before resuming from hibernation and disable x2apic and xapic.Don't set __CPUINIT for start_cpu0() in head_32.S. Clean up CPU0 wake up nmi handler after callin and callout sync. In a period (3 seconds), check if CPU0 wake up NMI is handled after offlined CPU0 exits from mwait. v5: Add CONFIG_BOOTPARAM_HOTPLUG_CPU0 and CONFIG_DEBUG_HOTPLUG_CPU0. Simplify duplicate xstate_size init check. Wakeup CPU0 via nmi instead INITs. Add mcheck_cpu_init when CPU0 online. Change variable bsp_hotpluggable to cpu0_hotpluggable with __initdata qualifier. v4: Add __read_mostly for internal bsp_hotpluggable variable. Add my email address in cpu-hotplug.txt document. A wording change in comment. v3: Register a pm notifier to check if CPU0 is online before hibernate/suspend. Small wording changes in document and print info. v2: Add locking changes between cpu hotplug and hibernate/suspend. Change PIC irq bound to CPU0 detection. Fenghua Yu (14): doc: Add x86 CPU0 online/offline feature x86, Kconfig: Add config switch for CPU0 hotplug x86, topology: Don't offline CPU0 if any PIC irq can not be migrated out of it x86, hotplug: Support functions for CPU0 online/offline x86, hotplug, suspend: Online CPU0 for suspend or hibernate kernel/cpu.c: Add comment for priority in cpu_hotplug_pm_callback x86-64, hotplug: Add start_cpu0() entry point to head_64.S x86-32, hotplug: Add start_cpu0() entry point to head_32.S x86, hotplug: Wake up CPU0 via NMI instead of INIT, SIPI, SIPI x86, hotplug: During CPU0 online, enable x2apic, set_numa_node. x86, hotplug: The first online processor saves the MTRR state x86, hotplug: Handle retrigger irq by the first available CPU x86/i387.c: Initialize thread xstate only on CPU0 only once x86, topology: Debug CPU00 hotplug Documentation/cpu-hotplug.txt | 24 ++++++ Documentation/kernel-parameters.txt | 14 +++ arch/x86/Kconfig | 44 ++++++++++ arch/x86/include/asm/cpu.h | 4 + arch/x86/include/asm/smp.h | 1 + arch/x86/kernel/apic/io_apic.c | 4 +- arch/x86/kernel/cpu/common.c | 5 +- arch/x86/kernel/cpu/mtrr/main.c | 9 ++- arch/x86/kernel/head_32.S | 13 +++ arch/x86/kernel/head_64.S | 16 ++++ arch/x86/kernel/i387.c | 6 +- arch/x86/kernel/smpboot.c | 151 ++++++++++++++++++++++++++++------ arch/x86/kernel/topology.c | 101 ++++++++++++++++++++++-- arch/x86/power/cpu.c | 82 +++++++++++++++++++ kernel/cpu.c | 5 + 15 files changed, 438 insertions(+), 41 deletions(-) -- 1.7.2