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 X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E19D9C433E9 for ; Thu, 3 Sep 2020 15:12:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC25A20716 for ; Thu, 3 Sep 2020 15:12:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="QQ94vAR9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729448AbgICPMI (ORCPT ); Thu, 3 Sep 2020 11:12:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45138 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728833AbgICM0r (ORCPT ); Thu, 3 Sep 2020 08:26:47 -0400 Received: from mail-pg1-x543.google.com (mail-pg1-x543.google.com [IPv6:2607:f8b0:4864:20::543]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 306EFC061249 for ; Thu, 3 Sep 2020 05:06:04 -0700 (PDT) Received: by mail-pg1-x543.google.com with SMTP id e33so1982471pgm.0 for ; Thu, 03 Sep 2020 05:06:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=l42Sw4hGC87WjooQg2VTZSFCehZO9m9AdkULNCdGfhY=; b=QQ94vAR9C6a51GpTGkrB1+xPpXfRafgvPa3tu6a+3G75SJXaTYLuJc+aYbErLcWfPr CucHQhF5l4BWTgM4UZBaXdBwO+8s55QNcM+2DJ92B86SADz7QZakpwkUXnwFHnL04xJR smJhScLAnqI38oNpr05jXEP03UuXB94dw1B1goqFZLPlwmWeZNgTVbv0kittkb9EuS61 9Vu4GMgFj1p3zoMvDwBo1EDUY8JFsb2AScBfwOSCR32qSiq76EQjJYR4WmTCu5a6kdrG qcqRr57lm9R51EqFelU2ta3IbNgwRf2dWKoJDqzGSpKc0QH4zoncfhXeUayjhlOKr2CQ 2Y7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=l42Sw4hGC87WjooQg2VTZSFCehZO9m9AdkULNCdGfhY=; b=ay2rxkgJkdQY7KSreXmID1OX1xbCz+MTG9W+evPlM9bQKlLdmtpLVpWrcYl5sgXSLZ 7Z6mKrHPX0x3fwu8PQo6Uz0mOVB1+prxfqvkZJCg++sGF3eu8917ZqesOlT/ZwKfimjh nOdGS1heOky+gQIR8PIX8jsHpUqlr+QSm6lBmsKH/yMPUgqTm3qSR0QncY5Mu4gvzrzP SiNfxr5SJ1LIC5VQl8LEmxYZ+UO14JFcjlWdBBlD+zrVXdu/1f0N3fydKDl6KDYyuH2p cpgyAK5N//M68bVCnpepTUWgo3tO+evIVN2MpjNK75Mw9iet26DKyCsTgIZYbuNutSQL /LMA== X-Gm-Message-State: AOAM531Zt2eS3Svxki6TLDE273OOv7TRCaaYTJnQoSTx3D5TVSP+HSt0 W/Y8d1vKl+AwDJJa+Xit27Lhxg== X-Google-Smtp-Source: ABdhPJwA8w/V9i9vrKKv3vQBxhzDj1BOn4fq9KGcKRyand8nMjBomLB0bAwwW8ejG7VaZ6lBdtyH9Q== X-Received: by 2002:a63:ce56:: with SMTP id r22mr2749565pgi.141.1599134763468; Thu, 03 Sep 2020 05:06:03 -0700 (PDT) Received: from localhost.localdomain ([117.210.209.248]) by smtp.gmail.com with ESMTPSA id s1sm2922022pgh.47.2020.09.03.05.05.56 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 03 Sep 2020 05:06:02 -0700 (PDT) From: Sumit Garg To: maz@kernel.org, catalin.marinas@arm.com, will@kernel.org Cc: linux-arm-kernel@lists.infradead.org, tglx@linutronix.de, jason@lakedaemon.net, julien.thierry.kdev@gmail.com, dianders@chromium.org, daniel.thompson@linaro.org, jason.wessel@windriver.com, kgdb-bugreport@lists.sourceforge.net, linux-kernel@vger.kernel.org, Sumit Garg Subject: [PATCH v3 3/4] arm64: smp: Setup IPI_CALL_NMI_FUNC as a pseudo NMI Date: Thu, 3 Sep 2020 17:35:11 +0530 Message-Id: <1599134712-30923-4-git-send-email-sumit.garg@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1599134712-30923-1-git-send-email-sumit.garg@linaro.org> References: <1599134712-30923-1-git-send-email-sumit.garg@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Setup IPI_CALL_NMI_FUNC as a pseudo NMI using generic interrupt framework APIs. In case a plarform doesn't provide support for pseudo NMIs, switch back to IPI_CALL_NMI_FUNC being a normal interrupt. Signed-off-by: Sumit Garg --- arch/arm64/kernel/smp.c | 38 ++++++++++++++++++++++++++++---------- 1 file changed, 28 insertions(+), 10 deletions(-) diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 1b4c07c..572f8f5 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -81,6 +81,7 @@ enum ipi_msg_type { static int ipi_irq_base __read_mostly; static int nr_ipi __read_mostly = NR_IPI; static struct irq_desc *ipi_desc[NR_IPI] __read_mostly; +static int ipi_nmi = -1; static void ipi_setup(int cpu); static void ipi_teardown(int cpu); @@ -971,8 +972,14 @@ static void ipi_setup(int cpu) if (WARN_ON_ONCE(!ipi_irq_base)) return; - for (i = 0; i < nr_ipi; i++) - enable_percpu_irq(ipi_irq_base + i, 0); + for (i = 0; i < nr_ipi; i++) { + if (ipi_nmi == ipi_irq_base + i) { + if (!prepare_percpu_nmi(ipi_nmi)) + enable_percpu_nmi(ipi_nmi, 0); + } else { + enable_percpu_irq(ipi_irq_base + i, 0); + } + } } static void ipi_teardown(int cpu) @@ -982,23 +989,34 @@ static void ipi_teardown(int cpu) if (WARN_ON_ONCE(!ipi_irq_base)) return; - for (i = 0; i < nr_ipi; i++) - disable_percpu_irq(ipi_irq_base + i); + for (i = 0; i < nr_ipi; i++) { + if (ipi_nmi == ipi_irq_base + i) { + disable_percpu_nmi(ipi_nmi); + teardown_percpu_nmi(ipi_nmi); + } else { + disable_percpu_irq(ipi_irq_base + i); + } + } } void __init set_smp_ipi_range(int ipi_base, int n) { - int i; + int i, err; WARN_ON(n < NR_IPI); nr_ipi = min(n, NR_IPI); - for (i = 0; i < nr_ipi; i++) { - int err; + err = request_percpu_nmi(ipi_base + IPI_CALL_NMI_FUNC, + ipi_handler, "IPI", &cpu_number); + if (!err) + ipi_nmi = ipi_base + IPI_CALL_NMI_FUNC; - err = request_percpu_irq(ipi_base + i, ipi_handler, - "IPI", &cpu_number); - WARN_ON(err); + for (i = 0; i < nr_ipi; i++) { + if (ipi_base + i != ipi_nmi) { + err = request_percpu_irq(ipi_base + i, ipi_handler, + "IPI", &cpu_number); + WARN_ON(err); + } ipi_desc[i] = irq_to_desc(ipi_base + i); irq_set_status_flags(ipi_base + i, IRQ_HIDDEN); -- 2.7.4