From mboxrd@z Thu Jan 1 00:00:00 1970 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 BF3CAC32772 for ; Tue, 16 Aug 2022 06:41:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230165AbiHPGln (ORCPT ); Tue, 16 Aug 2022 02:41:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46724 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230188AbiHPGl1 (ORCPT ); Tue, 16 Aug 2022 02:41:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E93C1115B; Mon, 15 Aug 2022 18:27:14 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 182DC612FE; Tue, 16 Aug 2022 01:27:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A748AC433D6; Tue, 16 Aug 2022 01:27:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660613233; bh=dmLaa20TJjtO24bQO+wPMfgnol1pv4VrwShpWvKTm28=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NqTAHyjPMLvdcL95Os1dz+ijEWBu4FR7Av/+3Wdw3pUB9euNk6o3+3KA3AKeKeHff Dse4VTdhV+16cSlJaN8p7hossEELL7dUjNJSHcZMD4iozqOUB1BYHSkRk9+xLMacXJ 0EMuz2uAjPa8el5rW1TnqO/uvccwectU6KZWfhqLs4K9enMAQ/qjV+TbrIDnSRQF90 s0l4SiEdRF6h3WFCpwVlZm7kX1Lou3hdpFQOXZHjp9iEAD7UVlVf0Io1h7kH5ZnRoT A/DP5FGI8zIWHiYxBwVHFeTOs34WqsENTArh8DQPCbECNCZjmnPwt3OvZD3YpKCzTG FSX8TsteuzmaA== From: guoren@kernel.org To: xianting.tian@linux.alibaba.com, palmer@dabbelt.com, heiko@sntech.de Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, liaochang1@huawei.com, mick@ics.forth.gr, jszhang@kernel.org, Guo Ren , Guo Ren , Will Deacon , AKASHI Takahiro Subject: [PATCH 1/2] riscv: kexec: EOI active and mask all interrupts in kexec crash path Date: Mon, 15 Aug 2022 21:27:00 -0400 Message-Id: <20220816012701.561435-2-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220816012701.561435-1-guoren@kernel.org> References: <20220816012701.561435-1-guoren@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org From: Guo Ren If a crash happens on cpu3 and all interrupts are binding on cpu0, the bad irq routing will cause a crash kernel that can't receive any irq. Because start-up of crash kernel won't clean up other hart plic to enable the context. The patch is similar to 9141a003a491 ("ARM: 7316/1: kexec: EOI active and mask all interrupts in kexec crash path") and 78fd584cdec0 ("arm64: kdump: implement machine_crash_shutdown()"), also PowerPC has the same mechanism. Signed-off-by: Guo Ren Signed-off-by: Guo Ren Cc: Will Deacon Cc: AKASHI Takahiro --- arch/riscv/kernel/machine_kexec.c | 35 +++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c index ee79e6839b86..db41c676e5a2 100644 --- a/arch/riscv/kernel/machine_kexec.c +++ b/arch/riscv/kernel/machine_kexec.c @@ -15,6 +15,8 @@ #include /* For unreachable() */ #include /* For cpu_down() */ #include +#include +#include /* * kexec_image_info - Print received image details @@ -154,6 +156,37 @@ void crash_smp_send_stop(void) cpus_stopped = 1; } +static void machine_kexec_mask_interrupts(void) +{ + unsigned int i; + struct irq_desc *desc; + + for_each_irq_desc(i, desc) { + struct irq_chip *chip; + int ret; + + chip = irq_desc_get_chip(desc); + if (!chip) + continue; + + /* + * First try to remove the active state. If this + * fails, try to EOI the interrupt. + */ + ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false); + + if (ret && irqd_irq_inprogress(&desc->irq_data) && + chip->irq_eoi) + chip->irq_eoi(&desc->irq_data); + + if (chip->irq_mask) + chip->irq_mask(&desc->irq_data); + + if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) + chip->irq_disable(&desc->irq_data); + } +} + /* * machine_crash_shutdown - Prepare to kexec after a kernel crash * @@ -169,6 +202,8 @@ machine_crash_shutdown(struct pt_regs *regs) crash_smp_send_stop(); crash_save_cpu(regs, smp_processor_id()); + machine_kexec_mask_interrupts(); + pr_info("Starting crashdump kernel...\n"); } -- 2.36.1