From patchwork Mon May 8 19:44:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13234932 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 ABC96C7EE2F for ; Mon, 8 May 2023 19:47:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234233AbjEHTrI (ORCPT ); Mon, 8 May 2023 15:47:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230137AbjEHTql (ORCPT ); Mon, 8 May 2023 15:46:41 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01F817EED; Mon, 8 May 2023 12:45:01 -0700 (PDT) Message-ID: <20230508185218.696553809@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1683575049; 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=3tzd3hEIt5mPiFNhB7mGn6+j5PGwWpl970beJ0OUc/w=; b=C9XC5JI8zhwnnoQtLMIubfpUrFZX045J0qH0esdV5efaL1DfV2riv76m/cVjfmJF0fN9eF Dg9M8YbSEWBbAOdQKsXxR5bxpQ7opMqC9KZ7LG3mnhfF2YiHhuyNa2uxYzQh+4oA7V/0+Y cYy3VXWPussLtl1gvcbp245haJ5E4+9ssxa8XZloSJNIOQi4zAFNxq77aqQQmu5H6aGbpR XU+KqCkEIHDUAbHLQ4CVUIfkHOtLfNXQ5l22br1Rpz/dhbFOz00hUN+6cf2I0hZ8tRIa+X 2TI0s8Q/f+BqbSNzvYN5ujjjPbaZrYZMoD26kttduUli9cAwakgVH+aefPZcgg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1683575049; 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=3tzd3hEIt5mPiFNhB7mGn6+j5PGwWpl970beJ0OUc/w=; b=iemtyuzb0UI5fQ6Aq9I7tT3PTD5UcdGEt1e/CnmmJ3j7zbcR7ak/dMGG4/JiCkppeVPKaa xBpQm1dpjEEo1dBQ== 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)" , Palmer Dabbelt Subject: [patch v3 26/36] riscv: Switch to hotplug core state synchronization References: <20230508181633.089804905@linutronix.de> MIME-Version: 1.0 Date: Mon, 8 May 2023 21:44:08 +0200 (CEST) Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Thomas Gleixner Switch to the CPU hotplug core state tracking and synchronization mechanim. No functional change intended. Signed-off-by: Thomas Gleixner Acked-by: Palmer Dabbelt Tested-by: Michael Kelley --- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/smp.h | 2 +- arch/riscv/kernel/cpu-hotplug.c | 14 +++++++------- 3 files changed, 9 insertions(+), 8 deletions(-) --- --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -122,6 +122,7 @@ config RISCV select HAVE_RSEQ select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS + select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU select IRQ_DOMAIN select IRQ_FORCED_THREADING select KASAN_VMALLOC if KASAN --- a/arch/riscv/include/asm/smp.h +++ b/arch/riscv/include/asm/smp.h @@ -70,7 +70,7 @@ asmlinkage void smp_callin(void); #if defined CONFIG_HOTPLUG_CPU int __cpu_disable(void); -void __cpu_die(unsigned int cpu); +static inline void __cpu_die(unsigned int cpu) { } #endif /* CONFIG_HOTPLUG_CPU */ #else --- a/arch/riscv/kernel/cpu-hotplug.c +++ b/arch/riscv/kernel/cpu-hotplug.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -49,17 +50,15 @@ int __cpu_disable(void) return ret; } +#ifdef CONFIG_HOTPLUG_CPU /* - * Called on the thread which is asking for a CPU to be shutdown. + * Called on the thread which is asking for a CPU to be shutdown, if the + * CPU reported dead to the hotplug core. */ -void __cpu_die(unsigned int cpu) +void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { int ret = 0; - if (!cpu_wait_death(cpu, 5)) { - pr_err("CPU %u: didn't die\n", cpu); - return; - } pr_notice("CPU%u: off\n", cpu); /* Verify from the firmware if the cpu is really stopped*/ @@ -76,9 +75,10 @@ void __noreturn arch_cpu_idle_dead(void) { idle_task_exit(); - (void)cpu_report_death(); + cpuhp_ap_report_dead(); cpu_ops[smp_processor_id()]->cpu_stop(); /* It should never reach here */ BUG(); } +#endif