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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 EA5EFC433F5 for ; Fri, 24 Sep 2021 13:33:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D427261090 for ; Fri, 24 Sep 2021 13:33:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346545AbhIXNe6 (ORCPT ); Fri, 24 Sep 2021 09:34:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346282AbhIXNed (ORCPT ); Fri, 24 Sep 2021 09:34:33 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 550CBC061A15 for ; Fri, 24 Sep 2021 06:29:22 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id t4so6533280plo.0 for ; Fri, 24 Sep 2021 06:29:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=EPqUASWwyNuUhMior37hMo+yqFA/0CFRmHFpRpWedHU=; b=jXd4h1P5tG3/KArfkSmvmYJXBb6aKx5mKYkgNooa6owTVly6XeFrlShLn/IKEikiTK WuSSDdkdb5CgOwivKMKLoWx15Vmqf2dk30u2oP0KyTfnabjWFX79lwcaNhQRAL8o2QHh WBTF0mJXYwd8h1CIXUaj9ZBN8iYqYU1LA7XAelBRsLG580OII2hvCSJeLrkR/12RFSmt RGSQ7bbGY522F+kcyr7J7nw9UwXb6ILp9hFeLpJ1fJfzmZFSGc2fDVgeYBieNmri4gQz kKfLoZ1HRe9bz59jH26aC52N7CadjXU8x4dY9R8aon5YWDHDmg7hydn0/sjPAzoub5Dq ut6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=EPqUASWwyNuUhMior37hMo+yqFA/0CFRmHFpRpWedHU=; b=tgcyr6cx/tMa3Bsh1Cqjr4VUvfCERB1mKofV1LHmCm0yCPMNd/bxLaC0LjN15rEgu+ 9ziejJ1I7zMFBe7rbQJm3QihVPeNhCim7J92cD/X2dXuWk6JsMtv2qWEZ21dwAV1uvoo EDZFkSGMRtXeGWw/gLnMRarKgAMzWLqO+sh6aw7GxiDe5elheS4VqYsfMj6NyQrYUIQZ EeYI/EoOiNcesKhPq+Q9dVzYTZkkMf1NG7t2vuyQzF8G39YPubnzxZLah5pZUlELFGNR 5x9DklyF105iE6KN2dU+WbaI/uQInk99hLL1n2dS/g/vbgN3GS5Lg06/bf/jnuGpdPxq FVzw== X-Gm-Message-State: AOAM533TnR/gI4eW71OLHyQY5WrTOS7j02AIKQzVWT+VNp98peKAs6Rz gFQ2mFnyEbig2JcBl8wCow== X-Google-Smtp-Source: ABdhPJyQ1WXP2tX0QuZxhDZ5p5kDJty62Fr2t/SIdOFtZmPHAVPyEc7Cgby/F951HIOQL+ltoiSLzA== X-Received: by 2002:a17:902:a50f:b029:11a:b033:e158 with SMTP id s15-20020a170902a50fb029011ab033e158mr9345901plq.26.1632490161936; Fri, 24 Sep 2021 06:29:21 -0700 (PDT) Received: from piliu.users.ipa.redhat.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id 26sm11756573pgx.72.2021.09.24.06.29.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Sep 2021 06:29:21 -0700 (PDT) From: Pingfan Liu To: linux-arm-kernel@lists.infradead.org Cc: Pingfan Liu , Catalin Marinas , Will Deacon , Mark Rutland , Marc Zyngier , Joey Gouly , Sami Tolvanen , Julien Thierry , Thomas Gleixner , Yuichi Ito , linux-kernel@vger.kernel.org Subject: [PATCHv2 5/5] irqchip/GICv3: make reschedule-ipi light weight Date: Fri, 24 Sep 2021 21:28:37 +0800 Message-Id: <20210924132837.45994-6-kernelfans@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210924132837.45994-1-kernelfans@gmail.com> References: <20210924132837.45994-1-kernelfans@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To achieve the light weight as DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi) on x86, it had better treat irqnr differently at the frontend. And let IPI_RESCHEDULE call __irq_enter_raw() instead of irq_enter_rcu(). Signed-off-by: Pingfan Liu Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Cc: Marc Zyngier Cc: Joey Gouly Cc: Sami Tolvanen Cc: Julien Thierry Cc: Thomas Gleixner Cc: Yuichi Ito Cc: linux-kernel@vger.kernel.org To: linux-arm-kernel@lists.infradead.org --- drivers/irqchip/irq-gic-v3.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index 906538fa8771..593d4539a209 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -709,6 +709,9 @@ static void gic_handle_nmi(struct pt_regs *regs) gic_deactivate_unhandled(irqnr); } +/* RESCHEDULE IPI hwirq nr is 0, and the only raw one */ +static unsigned long raw_interrupt_mask = 1; + static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) { u32 irqnr; @@ -729,12 +732,20 @@ static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs else isb(); - irq_enter_rcu(); + if (raw_interrupt_mask & 1 << irqnr) + __irq_enter_raw(); + else + irq_enter_rcu(); + if (handle_domain_irq(gic_data.domain, irqnr, regs)) { WARN_ONCE(true, "Unexpected interrupt received!\n"); gic_deactivate_unhandled(irqnr); } - irq_exit_rcu(); + + if (raw_interrupt_mask & 1 << irqnr) + __irq_exit_raw(); + else + irq_exit_rcu(); } static u32 gic_get_pribits(void) -- 2.31.1