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=-10.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 0A478C433E7 for ; Thu, 15 Oct 2020 21:23:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9734B2076A for ; Thu, 15 Oct 2020 21:23:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602797024; bh=VscXPeqlcKVbdjZBU6CUVcSFWH6y6A9dEwXSrkAyznM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=hq7YxglHYBR5OEO+Ep1RbnFMv8qLNZDyj1ZXdqXzWRjSiqrdiObqeCoccHQzXWfk0 cPYi++fdz4wZj6ydtECntwPkNkorBg+Ndl4JksI6J7N365Xq+zB2RODYmZ8S1i6+Sc JnS4xscdq3PNm2eWBZuGVDX0HNAxBuS+N9CB6epg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730143AbgJOVXn (ORCPT ); Thu, 15 Oct 2020 17:23:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:57928 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726867AbgJOVXn (ORCPT ); Thu, 15 Oct 2020 17:23:43 -0400 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 23ECE20759; Thu, 15 Oct 2020 21:23:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602797022; bh=VscXPeqlcKVbdjZBU6CUVcSFWH6y6A9dEwXSrkAyznM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=F2+Ax4gmR/rlAvQFBBLCxTl11n9Muv1FLIYT5KjeWoOqNcmA/9erXLTC/fTOU5sqw /R6aEyD5tNMme1gJ5yt3lnD5+2a94ihk82WOHCzf1uwRB7Z+nLI8xdg8g4VD75rpj7 Ddnem6dp894T2fJIbKKp8V1PGElvmpdbfQMsiKMU= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1kTAiq-001UWJ-8L; Thu, 15 Oct 2020 22:23:40 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Thu, 15 Oct 2020 22:23:40 +0100 From: Marc Zyngier To: Greentime Hu Cc: tglx@linutronix.de, jason@lakedaemon.net, palmer@dabbelt.com, paul.walmsley@sifive.com, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH 2/2] irqchip/sifive-plic: Fix the interrupt was enabled accidentally issue. In-Reply-To: <20201012135724.110579-2-greentime.hu@sifive.com> References: <20201012135724.110579-1-greentime.hu@sifive.com> <20201012135724.110579-2-greentime.hu@sifive.com> User-Agent: Roundcube Webmail/1.4.9 Message-ID: <5bedfbc723665c979eb73eefadb21970@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: greentime.hu@sifive.com, tglx@linutronix.de, jason@lakedaemon.net, palmer@dabbelt.com, paul.walmsley@sifive.com, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-10-12 14:57, Greentime Hu wrote: > In commit 2ca0b460bbcb ("genirq/affinity: Make affinity setting if > activated opt-in"), > it added irqd_affinity_on_activate() checking in the function > irq_set_affinity_deactivated() so it will return false here. > In that case, it will call irq_try_set_affinity() -> plic_irq_toggle() > which will enable the interrupt to cause the CPU hang. > > if (irq_set_affinity_deactivated()) > return 0; > ... > irq_try_set_affinity(data, mask, force); > > [ 919.015783] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: > [ 919.020922] rcu: 0-...0: (0 ticks this GP) > idle=7d2/1/0x4000000000000002 softirq=1424/1424 fqs=105807 > [ 919.030295] (detected by 1, t=225825 jiffies, g=1561, q=3496) > [ 919.036109] Task dump for CPU 0: > [ 919.039321] kworker/0:1 R running task 0 30 2 > 0x00000008 > [ 919.046359] Workqueue: events set_brightness_delayed > [ 919.051302] Call Trace: > [ 919.053738] [] __schedule+0x194/0x4de > [ 982.035783] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: > [ 982.040923] rcu: 0-...0: (0 ticks this GP) > idle=7d2/1/0x4000000000000002 softirq=1424/1424 fqs=113325 > [ 982.050294] (detected by 1, t=241580 jiffies, g=1561, q=3509) > [ 982.056108] Task dump for CPU 0: > [ 982.059321] kworker/0:1 R running task 0 30 2 > 0x00000008 > [ 982.066359] Workqueue: events set_brightness_delayed > [ 982.071302] Call Trace: > [ 982.073739] [] __schedule+0x194/0x4de > [..] > > After applying this patch, the CPU hang issue can be fixed. > > Signed-off-by: Greentime Hu > --- > drivers/irqchip/irq-sifive-plic.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/irqchip/irq-sifive-plic.c > b/drivers/irqchip/irq-sifive-plic.c > index 4cc8a2657a6d..8a673d9cff69 100644 > --- a/drivers/irqchip/irq-sifive-plic.c > +++ b/drivers/irqchip/irq-sifive-plic.c > @@ -183,10 +183,14 @@ static int plic_irqdomain_map(struct irq_domain > *d, unsigned int irq, > irq_hw_number_t hwirq) > { > struct plic_priv *priv = d->host_data; > + struct irq_data *irqd; > > irq_domain_set_info(d, irq, hwirq, &plic_chip, d->host_data, > handle_fasteoi_irq, NULL, NULL); > irq_set_noprobe(irq); > + irqd = irq_get_irq_data(irq); > + irqd_set_single_target(irqd); > + irqd_set_affinity_on_activate(irqd); > irq_set_affinity(irq, &priv->lmask); > return 0; > } How does this fix anything? The plic driver doesn't have an activate callback, so how does it make any difference? I get the feeling this papers over another issue. M. -- Jazz is not dead. It just smells funny...