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[23.128.96.18]) by mx.google.com with ESMTP id s2si1423970plg.489.2022.02.08.23.33.26; Tue, 08 Feb 2022 23:33:41 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=C3WubjhT; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383100AbiBHQWS (ORCPT + 99 others); Tue, 8 Feb 2022 11:22:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354546AbiBHQWO (ORCPT ); Tue, 8 Feb 2022 11:22:14 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37E5CC0612B8 for ; Tue, 8 Feb 2022 08:22:14 -0800 (PST) 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 C7CBB616D4 for ; Tue, 8 Feb 2022 16:22:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7AA85C340E9; Tue, 8 Feb 2022 16:22:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1644337333; bh=MejpiH0diIFxacygh8l6EcAFhF9ZPTI/1saRrB4FEHs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C3WubjhTrezZEmOoDNOWDkqOhjIIkSEZxvmA73rQzLCtBhiePAR2kA1dryjSJVYBe NWjwkPH3Af4gTZvROlC8XGmMAafkCX4QgEzauAO1ftCegAqnSr5KkiK5iHGl4TAhaY YdU6zmsr98mqhbZp16LUFhkD3JVo7xEGBIYjFkF2Ggc1rZgAqDVEuw8l1IbPwMBN/i jTdh1fFWY6jKI/BFGMSm4VE9oR7y7nztfxp4vsbYi9QojgsakO/29QEqGk9eXIeV1L SBF85MJzqqtxBdt6iOHR6jHbFIyk0ksFJCilG9axZhOx47m2ZJFXk9yVIuNY0dP5dU wdxVd/a80nWHg== From: Will Deacon To: linux-kernel@vger.kernel.org, Zhou Guanghui , iommu@lists.linux-foundation.org Cc: catalin.marinas@arm.com, kernel-team@android.com, Will Deacon , xuqiang36@huawei.com, jean-philippe@linaro.org, joro@8bytes.org Subject: Re: [PATCH] iommu/arm-smmu-v3: fix event handling soft lockup Date: Tue, 8 Feb 2022 16:21:56 +0000 Message-Id: <164433646915.1069624.13877694890558987574.b4-ty@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220119070754.26528-1-zhouguanghui1@huawei.com> References: <20220119070754.26528-1-zhouguanghui1@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 19 Jan 2022 07:07:54 +0000, Zhou Guanghui wrote: > During event processing, events are read from the event queue one > by one until the queue is empty.If the master device continuously > requests address access at the same time and the SMMU generates > events, the cyclic processing of the event takes a long time and > softlockup warnings may be reported. > > arm-smmu-v3 arm-smmu-v3.34.auto: event 0x0a received: > arm-smmu-v3 arm-smmu-v3.34.auto: 0x00007f220000280a > arm-smmu-v3 arm-smmu-v3.34.auto: 0x000010000000007e > arm-smmu-v3 arm-smmu-v3.34.auto: 0x00000000034e8670 > watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [irq/268-arm-smm:247] > Call trace: > _dev_info+0x7c/0xa0 > arm_smmu_evtq_thread+0x1c0/0x230 > irq_thread_fn+0x30/0x80 > irq_thread+0x128/0x210 > kthread+0x134/0x138 > ret_from_fork+0x10/0x1c > Kernel panic - not syncing: softlockup: hung tasks > > [...] Applied to will (for-joerg/arm-smmu/updates), thanks! [1/1] iommu/arm-smmu-v3: fix event handling soft lockup https://git.kernel.org/will/c/30de2b541af9 Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev