From patchwork Thu May 4 19:02:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13231600 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DFD3FC7EE21 for ; Thu, 4 May 2023 19:05:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Date:MIME-Version:References:Subject:Cc :To:From:Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Owner; bh=bTf6QCa8bPi9t5jmKbRj9pDPx6PYrGOUJXQsqMLZzYs=; b=ev44DgVI//HO7g ZFFezRF/uXcPHKMqoAYgUyT5TsWOViW+GGMotOYunscHFBAyznwNUZgDZJitQ1ltgFhrgB2HnGn7Z 1aQPUkbqIkpHWRe17Nvt1BuyCv8aI/T+7QY+7mBhGdBSCmp2ckV3LS63PDvpnTryrJAUNYAlGgkkU jqF92clnCBGvXsAxEAoWmmEhKz2nQQi+vAgQMGLfe9Eh3JKDmQWRZW6Jzbb8EfcroxgU7z+FRG0QB lVVOipDMcICIb94Tjveprh1v1XZLsvuk8Fo+G/9HL2QgxPq7NChrglQklnCFi9cG3NP821k+/PTXv bjaChd96aylEwj1aKv4w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pueFy-008gET-0t; Thu, 04 May 2023 19:04:46 +0000 Received: from galois.linutronix.de ([2a0a:51c0:0:12e:550::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pueE6-008e1K-2Y; Thu, 04 May 2023 19:02:54 +0000 Message-ID: <20230504185938.019102098@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1683226969; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=/CyZEPJpAlcZassSDf6yPEl3fpuFiplGVJNrFAE1PjY=; b=JeZqr+iiqJKFh0frIQBEVa7KD1KSyYbB9ecZpoyy+Ss/8iF+SulZrNYmpNtbaINJPS+GKN Q6QZfpf+NIX8lp5U7q5IujAix4aBXn2NuS91LKTuT2EN4Wx27Sc9ozVGaKryZ1Xz3aRx2+ pp8GZXqg1tw/FM8H1JHmg09BpGTRsIUfCFt3B7zeMEtw/SuA3yHhIfdyfHSJKF8aaDmkKn qwpwBR9+GFxfv0EF2zQ4uLzx0BTfrYNVsAosc3zXIaKDTQTdRFy5RnXNSRt5/H9P60pdjJ D6kES7EIGSOfUpN+Y62CgSsoDjmz21DT61TP4zDe+YR8Qs5pB+Pp23YRydrpMw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1683226969; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=/CyZEPJpAlcZassSDf6yPEl3fpuFiplGVJNrFAE1PjY=; b=QiMfb78X11T9xHP4n7a/ByAPbBWoJBf5QSjjdz3uu1bRQb6HpSz+jFnI3924nrlMSI1nr3 XF1289B2KoIGXfCw== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, David Woodhouse , Andrew Cooper , Brian Gerst , Arjan van de Veen , Paolo Bonzini , Paul McKenney , Tom Lendacky , Sean Christopherson , Oleksandr Natalenko , Paul Menzel , "Guilherme G. Piccoli" , Piotr Gorski , Usama Arif , Juergen Gross , Boris Ostrovsky , xen-devel@lists.xenproject.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon , Guo Ren , linux-csky@vger.kernel.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org, "James E.J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Mark Rutland , Sabin Rapan , "Michael Kelley (LINUX)" Subject: [patch V2 31/38] x86/apic: Provide cpu_primary_thread mask References: <20230504185733.126511787@linutronix.de> MIME-Version: 1.0 Date: Thu, 4 May 2023 21:02:48 +0200 (CEST) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230504_120251_172210_D43F06CE X-CRM114-Status: GOOD ( 15.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Thomas Gleixner Make the primary thread tracking CPU mask based in preparation for simpler handling of parallel bootup. Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/apic.h | 2 -- arch/x86/include/asm/topology.h | 19 +++++++++++++++---- arch/x86/kernel/apic/apic.c | 20 +++++++++----------- arch/x86/kernel/smpboot.c | 12 +++--------- 4 files changed, 27 insertions(+), 26 deletions(-) --- --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -506,10 +506,8 @@ extern int default_check_phys_apicid_pre #endif /* CONFIG_X86_LOCAL_APIC */ #ifdef CONFIG_SMP -bool apic_id_is_primary_thread(unsigned int id); void apic_smt_update(void); #else -static inline bool apic_id_is_primary_thread(unsigned int id) { return false; } static inline void apic_smt_update(void) { } #endif --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -31,9 +31,9 @@ * CONFIG_NUMA. */ #include +#include #ifdef CONFIG_NUMA -#include #include #include @@ -139,9 +139,20 @@ static inline int topology_max_smt_threa 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); -bool topology_is_primary_thread(unsigned int cpu); bool topology_smt_supported(void); -#else + +extern struct cpumask __cpu_primary_thread_mask; +#define cpu_primary_thread_mask ((const struct cpumask *)&__cpu_primary_thread_mask) + +/** + * topology_is_primary_thread - Check whether CPU is the primary SMT thread + * @cpu: CPU to check + */ +static inline bool topology_is_primary_thread(unsigned int cpu) +{ + return cpumask_test_cpu(cpu, cpu_primary_thread_mask); +} +#else /* CONFIG_SMP */ #define topology_max_packages() (1) static inline int topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; } @@ -152,7 +163,7 @@ static inline int topology_max_die_per_p static inline int topology_max_smt_threads(void) { return 1; } static inline bool topology_is_primary_thread(unsigned int cpu) { return true; } static inline bool topology_smt_supported(void) { return false; } -#endif +#endif /* !CONFIG_SMP */ static inline void arch_fix_phys_package_id(int num, u32 slot) { --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -2386,20 +2386,16 @@ bool arch_match_cpu_phys_id(int cpu, u64 } #ifdef CONFIG_SMP -/** - * apic_id_is_primary_thread - Check whether APIC ID belongs to a primary thread - * @apicid: APIC ID to check - */ -bool apic_id_is_primary_thread(unsigned int apicid) +static void cpu_mark_primary_thread(unsigned int cpu, unsigned int apicid) { - u32 mask; - - if (smp_num_siblings == 1) - return true; /* Isolate the SMT bit(s) in the APICID and check for 0 */ - mask = (1U << (fls(smp_num_siblings) - 1)) - 1; - return !(apicid & mask); + u32 mask = (1U << (fls(smp_num_siblings) - 1)) - 1; + + if (smp_num_siblings == 1 || !(apicid & mask)) + cpumask_set_cpu(cpu, &__cpu_primary_thread_mask); } +#else +static inline void cpu_mark_primary_thread(unsigned int cpu, unsigned int apicid) { } #endif /* @@ -2544,6 +2540,8 @@ int generic_processor_info(int apicid, i set_cpu_present(cpu, true); num_processors++; + cpu_mark_primary_thread(cpu, apicid); + return cpu; } --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -102,6 +102,9 @@ EXPORT_PER_CPU_SYMBOL(cpu_die_map); DEFINE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info); EXPORT_PER_CPU_SYMBOL(cpu_info); +/* CPUs which are the primary SMT threads */ +struct cpumask __cpu_primary_thread_mask __read_mostly; + /* Representing CPUs for which sibling maps can be computed */ static cpumask_var_t cpu_sibling_setup_mask; @@ -283,15 +286,6 @@ static void notrace start_secondary(void } /** - * topology_is_primary_thread - Check whether CPU is the primary SMT thread - * @cpu: CPU to check - */ -bool topology_is_primary_thread(unsigned int cpu) -{ - return apic_id_is_primary_thread(per_cpu(x86_cpu_to_apicid, cpu)); -} - -/** * topology_smt_supported - Check whether SMT is supported by the CPUs */ bool topology_smt_supported(void)