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=-5.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_PASS 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 A1136C5CFFE for ; Mon, 10 Dec 2018 16:30:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E40020821 for ; Mon, 10 Dec 2018 16:30:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6E40020821 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-pci-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726261AbeLJQa4 (ORCPT ); Mon, 10 Dec 2018 11:30:56 -0500 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:58110 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727343AbeLJQa4 (ORCPT ); Mon, 10 Dec 2018 11:30:56 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id EC2CC1596; Mon, 10 Dec 2018 08:30:55 -0800 (PST) Received: from [10.1.196.62] (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 16C3F3F6A8; Mon, 10 Dec 2018 08:30:53 -0800 (PST) Subject: Re: [PATCH 0/3] PCI: designware: Fixing MSI handling flow To: Lorenzo Pieralisi , Gustavo Pimentel Cc: linux-pci@vger.kernel.org, Bjorn Helgaas , Trent Piepho , Jingoo Han , faiz_abbas@ti.com, Joao Pinto , Vignesh R References: <20181113225734.8026-1-marc.zyngier@arm.com> <20181210161753.GA12563@e107981-ln.cambridge.arm.com> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <20181210161753.GA12563@e107981-ln.cambridge.arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Hi Lorenzo, On 10/12/2018 16:17, Lorenzo Pieralisi wrote: > On Tue, Nov 13, 2018 at 10:57:31PM +0000, Marc Zyngier wrote: >> It recently came to light that the Designware PCIe driver is rather >> broken in the way it handles MSI[1]: >> >> - It masks interrupt by disabling them, meaning that MSIs generated >> during the masked window are simply lost. Oops. >> >> - Acking of the currently pending MSI is done outside of the interrupt >> flow, getting moved around randomly and ultimately breaking the >> driver. Not great. >> >> This series attempts to address this by switching to using the MASK >> register for masking interrupts (!), and move the ack into the >> appropriate callback, giving it a fixed place in the MSI handling >> flow. >> >> Note that this is only compile-tested on my arm64 laptop, as I'm >> travelling and do not have the required HW to test it anyway. I'd >> welcome both review and testing by the interested parties (dwc >> maintainer and users affected by existing bugs). >> >> Thanks, >> >> M. >> >> [1] https://patchwork.kernel.org/patch/10657987/ >> >> Marc Zyngier (3): >> PCI: designware: Use interrupt masking instead of disabling >> PCI: designware: Take lock when ACKing an interrupt >> PCI: designware: Move interrupt acking into the proper callback >> >> .../pci/controller/dwc/pcie-designware-host.c | 22 ++++++++++++------- >> 1 file changed, 14 insertions(+), 8 deletions(-) > > Marc, Gustavo, > > I have decided to queue this series - fixed-up as per this thread, > available at: > > git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git test/pci-dwc-msi > > We allowed enough time for people to test it, we can't leave mainline > broken for the, apparently few, people who care. > > I *think* that this is the Fixes: tag to be added to all patches in this > series, @Gustavo please countercheck: > > 7c5925afbc58 ("PCI: dwc: Move MSI IRQs allocation to IRQ domains > hierarchical API") > > I will mark them for stable too and we will work on backports to be > sent in due course. Thanks for doing that Lorenzo. I'll work on a backport of the last patch as soon as this hits mainline. Cheers, M. -- Jazz is not dead. It just smells funny...