From patchwork Mon May 8 19:44:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13234942 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 D2305C7EE2E for ; Mon, 8 May 2023 19:47:49 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.531792.827728 (Exim 4.92) (envelope-from ) id 1pw6pg-0006qx-SZ; Mon, 08 May 2023 19:47:40 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 531792.827728; Mon, 08 May 2023 19:47:40 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pw6pg-0006pV-JT; Mon, 08 May 2023 19:47:40 +0000 Received: by outflank-mailman (input) for mailman id 531792; Mon, 08 May 2023 19:47:39 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pw6mA-0004GB-3l for xen-devel@lists.xenproject.org; Mon, 08 May 2023 19:44:02 +0000 Received: from galois.linutronix.de (galois.linutronix.de [193.142.43.55]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id ae6cacde-edd8-11ed-b226-6b7b168915f2; Mon, 08 May 2023 21:44:01 +0200 (CEST) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: ae6cacde-edd8-11ed-b226-6b7b168915f2 Message-ID: <20230508185218.413540718@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1683575041; 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=38nzuLvukobfje6Ccppy0BhMMd+JJk7+K0e3k3P15Wg=; b=x5uunjrfWzFDxVEDVb12W2XtAz1xdLN26NVHk7bMNEu2wIJNaum7qGKPG0dROx5n0HhLC+ FzBIUNB9IVFoDocC8+UO+48hmJZTHkBagkRSbcBi10tPYzBz2N+KBu3+t/DwlLjK8qgbHm Zyl2slxhswI4y0jqXj5mdHQ7jfB6T53pzIasGJrkcbdNjcE/FqTbh3cIh4s2CI2dpENglT jZGblTZh1KTfeLW19FXrR8et4/tPPGpgkP+CMulFHzL902fUKU7E5w1yXi6/rZi2EGU8tO CSr4Jls1MoB22W6EUMLB/NCwWjqQzCr6exaZi0Y+dcSIy9UXOvzD4rMbjXRcvg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1683575041; 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=38nzuLvukobfje6Ccppy0BhMMd+JJk7+K0e3k3P15Wg=; b=OFaURbehZY+bjBk6HdPJsuKX1EooATeyF0S/YDbEsa+/7byZljllwL7I/PloYv0yfuXe68 qGHlWRIfIq35xrAg== 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 v3 21/36] [patch V2 21/38] ARM: smp: Switch to hotplug core state synchronization References: <20230508181633.089804905@linutronix.de> MIME-Version: 1.0 Date: Mon, 8 May 2023 21:44:00 +0200 (CEST) From: Thomas Gleixner Switch to the CPU hotplug core state tracking and synchronization mechanim. No functional change intended. Signed-off-by: Thomas Gleixner Tested-by: Michael Kelley --- arch/arm/Kconfig | 1 + arch/arm/include/asm/smp.h | 2 +- arch/arm/kernel/smp.c | 18 +++++++----------- 3 files changed, 9 insertions(+), 12 deletions(-) --- --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -124,6 +124,7 @@ config ARM select HAVE_SYSCALL_TRACEPOINTS select HAVE_UID16 select HAVE_VIRT_CPU_ACCOUNTING_GEN + select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU select IRQ_FORCED_THREADING select MODULES_USE_ELF_REL select NEED_DMA_MAP_STATE --- a/arch/arm/include/asm/smp.h +++ b/arch/arm/include/asm/smp.h @@ -64,7 +64,7 @@ extern void secondary_startup_arm(void); extern int __cpu_disable(void); -extern void __cpu_die(unsigned int cpu); +static inline void __cpu_die(unsigned int cpu) { } extern void arch_send_call_function_single_ipi(int cpu); extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -288,15 +288,11 @@ int __cpu_disable(void) } /* - * called on the thread which is asking for a CPU to be shutdown - - * waits until shutdown has completed, or it is timed out. + * called on the thread which is asking for a CPU to be shutdown after the + * shutdown completed. */ -void __cpu_die(unsigned int cpu) +void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { - if (!cpu_wait_death(cpu, 5)) { - pr_err("CPU%u: cpu didn't die\n", cpu); - return; - } pr_debug("CPU%u: shutdown\n", cpu); clear_tasks_mm_cpumask(cpu); @@ -336,11 +332,11 @@ void __noreturn arch_cpu_idle_dead(void) flush_cache_louis(); /* - * Tell __cpu_die() that this CPU is now safe to dispose of. Once - * this returns, power and/or clocks can be removed at any point - * from this CPU and its cache by platform_cpu_kill(). + * Tell cpuhp_bp_sync_dead() that this CPU is now safe to dispose + * of. Once this returns, power and/or clocks can be removed at + * any point from this CPU and its cache by platform_cpu_kill(). */ - (void)cpu_report_death(); + cpuhp_ap_report_dead(); /* * Ensure that the cache lines associated with that completion are