From patchwork Thu Feb 9 15:41:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Usama Arif X-Patchwork-Id: 13134781 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21676C61DA4 for ; Thu, 9 Feb 2023 15:43:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231540AbjBIPn1 (ORCPT ); Thu, 9 Feb 2023 10:43:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55062 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231608AbjBIPms (ORCPT ); Thu, 9 Feb 2023 10:42:48 -0500 Received: from mail-wm1-x32f.google.com (mail-wm1-x32f.google.com [IPv6:2a00:1450:4864:20::32f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8145F2194E for ; Thu, 9 Feb 2023 07:42:10 -0800 (PST) Received: by mail-wm1-x32f.google.com with SMTP id bg26so1766090wmb.0 for ; Thu, 09 Feb 2023 07:42:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=RZtXX2FLZX58EqsM/L7GLBoTbc380n2CoP9DsqrA/M4=; b=RfVcBmZ4AbFK8XxzCYUL/xwi+SRObYKX4Du1x6dOK0OdQHH/R+a9+CcC1GcaX+kqNd NJDjMulJBDuYLgT+tm1Uq0fxCzGORbfFcqq8tKjubPbaF0yv9fkX4k+ad0tq8fQgmJL0 7SMMmLkSEAt9IVeIBCwYsq/E9g3DGDSIWcUuyo36mvCZJjx+7067Zw7oN5oxdML6U5sD 41A6EbsYczcIHsRHQK02KIft5rCpfLOp1dyUAGVhkQj3jOQgQ8xwdKA80/dOrovVbl1C g9Lnwv4X9FxJOwC8ASSMiyrpQHqHegWWIwRYqmNG2/5fq7QCCs1+emiJNHnjZyCpU9eC j7pQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=RZtXX2FLZX58EqsM/L7GLBoTbc380n2CoP9DsqrA/M4=; b=5LDwY6p08GAl1+F7rOAjUSD95R+VDJ3bXYphHs+7K8JiZNsPmmNa/EB0DsGyZFmHwF Xs76zDoAyQJOYZKsJLeft/BoQXUI35LDU6thRJBgg+FotKF1wJbLlyyAK1meDr8vgNaX tAfVp3SnPEHQQTwiGWGxQJJLgw3fMqExY1ZjaTl1mbk0k/+/txnO9V2T3imdLQNXAadr EOlEdWDgwZOozXhrWzjIsIxcBQD34otoju51VnaE39oiOVQlPz7EbbhCOEnF0cwjiWoA hbeUysasVi6EmRAjpUveMZY/OUEgEzFQrWCsfwwVejn94tKPVz9Kp0VJnOri1Jg3craQ DIog== X-Gm-Message-State: AO0yUKXGtjWzPpogjBF7rd5PRK3dlYaRh3ObwpMBqooW7LvelWcious0 goz3mK1zn2vjxscR+7CNYhGKfg== X-Google-Smtp-Source: AK7set/fJiDYSyxwgx2I4XMqzmUBEm6jmvbX+aEwLTjCD6seXnOQRCtDJoyMI5ZqzcZofIoQ4PNUTQ== X-Received: by 2002:a05:600c:3088:b0:3df:f860:3089 with SMTP id g8-20020a05600c308800b003dff8603089mr11816437wmn.32.1675957329099; Thu, 09 Feb 2023 07:42:09 -0800 (PST) Received: from usaari01.cust.communityfibre.co.uk ([2a02:6b6a:b566:0:8009:2525:9580:8db2]) by smtp.gmail.com with ESMTPSA id y6-20020a05600c364600b003df7b40f99fsm5099754wmq.11.2023.02.09.07.42.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Feb 2023 07:42:08 -0800 (PST) From: Usama Arif To: dwmw2@infradead.org, tglx@linutronix.de, kim.phillips@amd.com Cc: arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, paulmck@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de, fam.zheng@bytedance.com, punit.agrawal@bytedance.com, simon.evans@bytedance.com, liangma@liangbit.com, David Woodhouse , Usama Arif Subject: [PATCH v8 9/9] x86/smpboot: Serialize topology updates for secondary bringup Date: Thu, 9 Feb 2023 15:41:56 +0000 Message-Id: <20230209154156.266385-10-usama.arif@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230209154156.266385-1-usama.arif@bytedance.com> References: <20230209154156.266385-1-usama.arif@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: David Woodhouse The toplogy update is performed by the AP via smp_callin() after the BSP has called do_wait_cpu_initialized(), setting the AP's bit in cpu_callout_mask to allow it to proceed. In preparation to enable further parallelism of AP bringup, add locking to serialize the update even if multiple APs are (in future) permitted to proceed through the next stages of bringup in parallel. Without such ordering (and with that future extra parallelism), confusion ensues: [ 1.360149] x86: Booting SMP configuration: [ 1.360221] .... node #0, CPUs: #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 #15 #16 #17 #18 #19 #20 #21 #22 #23 [ 1.366225] .... node #1, CPUs: #24 #25 #26 #27 #28 #29 #30 #31 #32 #33 #34 #35 #36 #37 #38 #39 #40 #41 #42 #43 #44 #45 #46 #47 [ 1.370219] .... node #0, CPUs: #48 #49 #50 #51 #52 #53 #54 #55 #56 #57 #58 #59 #60 #61 #62 #63 #64 #65 #66 #67 #68 #69 #70 #71 [ 1.378226] .... node #1, CPUs: #72 #73 #74 #75 #76 #77 #78 #79 #80 #81 #82 #83 #84 #85 #86 #87 #88 #89 #90 #91 #92 #93 #94 #95 [ 1.382037] Brought 96 CPUs to x86/cpu:kick in 72232606 cycles [ 0.104104] smpboot: CPU 26 Converting physical 0 to logical die 1 [ 0.104104] smpboot: CPU 27 Converting physical 1 to logical package 2 [ 0.104104] smpboot: CPU 24 Converting physical 1 to logical package 3 [ 0.104104] smpboot: CPU 27 Converting physical 0 to logical die 2 [ 0.104104] smpboot: CPU 25 Converting physical 1 to logical package 4 [ 1.385609] Brought 96 CPUs to x86/cpu:wait-init in 9269218 cycles [ 1.395285] Brought CPUs online in 28930764 cycles [ 1.395469] smp: Brought up 2 nodes, 96 CPUs [ 1.395689] smpboot: Max logical packages: 2 [ 1.396222] smpboot: Total of 96 processors activated (576000.00 BogoMIPS) [Usama Arif: fixed rebase conflict] Signed-off-by: David Woodhouse Signed-off-by: Usama Arif --- arch/x86/include/asm/smp.h | 4 +- arch/x86/include/asm/topology.h | 2 - arch/x86/kernel/cpu/common.c | 6 +-- arch/x86/kernel/smpboot.c | 73 ++++++++++++++++++++------------- arch/x86/xen/smp_pv.c | 4 +- 5 files changed, 48 insertions(+), 41 deletions(-) diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index 33c0d5fd8af6..b4b29e052b6e 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -48,8 +48,6 @@ struct smp_ops { }; /* Globals due to paravirt */ -extern void set_cpu_sibling_map(int cpu); - #ifdef CONFIG_SMP extern struct smp_ops smp_ops; @@ -137,7 +135,7 @@ void native_send_call_func_single_ipi(int cpu); void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle); void smp_store_boot_cpu_info(void); -void smp_store_cpu_info(int id); +void smp_store_cpu_info(int id, bool force_single_core); asmlinkage __visible void smp_reboot_interrupt(void); __visible void smp_reschedule_interrupt(struct pt_regs *regs); diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h index 458c891a8273..4bccbd949a99 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -136,8 +136,6 @@ static inline int topology_max_smt_threads(void) return __max_smt_threads; } -int topology_update_package_map(unsigned int apicid, unsigned int cpu); -int topology_update_die_map(unsigned int dieid, unsigned int cpu); int topology_phys_to_logical_pkg(unsigned int pkg); int topology_phys_to_logical_die(unsigned int die, unsigned int cpu); bool topology_is_primary_thread(unsigned int cpu); diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 9cfca3d7d0e2..cf1a4eff7a76 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1766,7 +1766,7 @@ static void generic_identify(struct cpuinfo_x86 *c) * Validate that ACPI/mptables have the same information about the * effective APIC id and update the package map. */ -static void validate_apic_and_package_id(struct cpuinfo_x86 *c) +static void validate_apic_id(struct cpuinfo_x86 *c) { #ifdef CONFIG_SMP unsigned int apicid, cpu = smp_processor_id(); @@ -1777,8 +1777,6 @@ static void validate_apic_and_package_id(struct cpuinfo_x86 *c) pr_err(FW_BUG "CPU%u: APIC id mismatch. Firmware: %x APIC: %x\n", cpu, apicid, c->initial_apicid); } - BUG_ON(topology_update_package_map(c->phys_proc_id, cpu)); - BUG_ON(topology_update_die_map(c->cpu_die_id, cpu)); #else c->logical_proc_id = 0; #endif @@ -1969,7 +1967,7 @@ void identify_secondary_cpu(struct cpuinfo_x86 *c) #ifdef CONFIG_X86_32 enable_sep_cpu(); #endif - validate_apic_and_package_id(c); + validate_apic_id(c); x86_spec_ctrl_setup_ap(); update_srbds_msr(); diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index df839264266b..3ec5182d9698 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -180,16 +180,12 @@ static void smp_callin(void) apic_ap_setup(); /* - * Save our processor parameters. Note: this information - * is needed for clock calibration. - */ - smp_store_cpu_info(cpuid); - - /* + * Save our processor parameters and update topology. + * Note: this information is needed for clock calibration. * The topology information must be up to date before * calibrate_delay() and notify_cpu_starting(). */ - set_cpu_sibling_map(raw_smp_processor_id()); + smp_store_cpu_info(cpuid, false); ap_init_aperfmperf(); @@ -243,6 +239,12 @@ static void notrace start_secondary(void *unused) * its bit bit in cpu_callout_mask to release it. */ cpu_init_secondary(); + + /* + * Even though notify_cpu_starting() will do this, it does so too late + * as the AP may already have triggered lockdep splats by then. See + * commit 29368e093 ("x86/smpboot: Move rcu_cpu_starting() earlier"). + */ rcu_cpu_starting(raw_smp_processor_id()); x86_cpuinit.early_percpu_clock_init(); @@ -351,7 +353,7 @@ EXPORT_SYMBOL(topology_phys_to_logical_die); * @pkg: The physical package id as retrieved via CPUID * @cpu: The cpu for which this is updated */ -int topology_update_package_map(unsigned int pkg, unsigned int cpu) +static int topology_update_package_map(unsigned int pkg, unsigned int cpu) { int new; @@ -374,7 +376,7 @@ int topology_update_package_map(unsigned int pkg, unsigned int cpu) * @die: The die id as retrieved via CPUID * @cpu: The cpu for which this is updated */ -int topology_update_die_map(unsigned int die, unsigned int cpu) +static int topology_update_die_map(unsigned int die, unsigned int cpu) { int new; @@ -405,25 +407,7 @@ void __init smp_store_boot_cpu_info(void) c->initialized = true; } -/* - * The bootstrap kernel entry code has set these up. Save them for - * a given CPU - */ -void smp_store_cpu_info(int id) -{ - struct cpuinfo_x86 *c = &cpu_data(id); - - /* Copy boot_cpu_data only on the first bringup */ - if (!c->initialized) - *c = boot_cpu_data; - c->cpu_index = id; - /* - * During boot time, CPU0 has this setup already. Save the info when - * bringing up AP or offlined CPU0. - */ - identify_secondary_cpu(c); - c->initialized = true; -} +static arch_spinlock_t topology_lock = __ARCH_SPIN_LOCK_UNLOCKED; static bool topology_same_node(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) @@ -629,7 +613,7 @@ static struct sched_domain_topology_level x86_topology[] = { */ static bool x86_has_numa_in_package; -void set_cpu_sibling_map(int cpu) +static void set_cpu_sibling_map(int cpu) { bool has_smt = smp_num_siblings > 1; bool has_mp = has_smt || boot_cpu_data.x86_max_cores > 1; @@ -708,6 +692,37 @@ void set_cpu_sibling_map(int cpu) } } +/* + * The bootstrap kernel entry code has set these up. Save them for + * a given CPU + */ +void smp_store_cpu_info(int id, bool force_single_core) +{ + struct cpuinfo_x86 *c = &cpu_data(id); + + /* Copy boot_cpu_data only on the first bringup */ + if (!c->initialized) + *c = boot_cpu_data; + c->cpu_index = id; + /* + * During boot time, CPU0 has this setup already. Save the info when + * bringing up AP or offlined CPU0. + */ + identify_secondary_cpu(c); + + arch_spin_lock(&topology_lock); + BUG_ON(topology_update_package_map(c->phys_proc_id, id)); + BUG_ON(topology_update_die_map(c->cpu_die_id, id)); + c->initialized = true; + + /* For Xen PV */ + if (force_single_core) + c->x86_max_cores = 1; + + set_cpu_sibling_map(id); + arch_spin_unlock(&topology_lock); +} + /* maps the cpu to the sched domain representing multi-core */ const struct cpumask *cpu_coregroup_mask(int cpu) { diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c index 6175f2c5c822..09f94f940689 100644 --- a/arch/x86/xen/smp_pv.c +++ b/arch/x86/xen/smp_pv.c @@ -71,9 +71,7 @@ static void cpu_bringup(void) xen_enable_syscall(); } cpu = smp_processor_id(); - smp_store_cpu_info(cpu); - cpu_data(cpu).x86_max_cores = 1; - set_cpu_sibling_map(cpu); + smp_store_cpu_info(cpu, true); speculative_store_bypass_ht_init();