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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 605ADC1B0D8 for ; Wed, 9 Dec 2020 13:11:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 36A0923B45 for ; Wed, 9 Dec 2020 13:11:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732122AbgLINLZ (ORCPT ); Wed, 9 Dec 2020 08:11:25 -0500 Received: from mga09.intel.com ([134.134.136.24]:23843 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732168AbgLINLU (ORCPT ); Wed, 9 Dec 2020 08:11:20 -0500 IronPort-SDR: CqTLMF/is82imPvve3wNUoanm91iUmErFfTl1dmwwbXRnufJGyWW4UwJmRVpAydFxebnxbbosc 5t9SAQQEXj6w== X-IronPort-AV: E=McAfee;i="6000,8403,9829"; a="174217664" X-IronPort-AV: E=Sophos;i="5.78,405,1599548400"; d="scan'208";a="174217664" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2020 05:09:31 -0800 IronPort-SDR: 8wWlH8zOpc2ctV0Oyv6R2XkwS8pdNhV6T/lck+1wvsr5vBCbzyvJwaZPlWakRFLWdww3sGg5ya EzQQh5QVjbXg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.78,405,1599548400"; d="scan'208";a="368180336" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by fmsmga004.fm.intel.com with ESMTP; 09 Dec 2020 05:09:30 -0800 Subject: Re: xhci problem -> general protection fault To: Ross Zwisler Cc: Andrzej Pietrasiewicz , "linux-usb@vger.kernel.org" , "kernel@collabora.com" References: <20200925210517.GA4487@google.com> <7e38c533-6ea1-63a6-fc92-2ecef7ee1f84@linux.intel.com> <20201001164352.GA13249@google.com> <69f8cbc3-0ae7-cfb2-2fdd-556ada77381f@linux.intel.com> <20201012215348.GA3324220@google.com> From: Mathias Nyman Autocrypt: addr=mathias.nyman@linux.intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Archived-At: List-Archive: List-Post: On 8.12.2020 19.24, Ross Zwisler wrote: > On Fri, Dec 04, 2020 at 08:07:30PM +0200, Mathias Nyman wrote: > <> > > Here are some logs when running with that commit: > > https://gist.github.com/rzwisler/17923c9dedf2b914254eadd1cd294a4c > > I think we only consistently get the clean failure case with the dequeue > pointer being 0 if CONFIG_INTEL_IOMMU_DEFAULT_ON=y. > > If that option is set to 'n', we get the same failure where the xHCI > controller totally dies (log "CONFIG_INTEL_IOMMU_DEFAULT_ON=n" in the gist). > > With CONFIG_INTEL_IOMMU_DEFAULT_ON=y we do seem to live through multiple > errors, but as soon as I try to use the device normally afterwards it seems to > spin forever with these messages: > > xhci_hcd 0000:00:14.0: Looking for event-dma 00000000fff0a330 trb-start 00000000f8884000 trb-end 0000000000000000 seg-start 00000000f8884000 seg-end 00000000f8884ff0 > > Are you able to reproduce this with Andrzej's bulk-cancel script? I think you > probably just need a device which accepts bulk transfer commands? In my most > recent reproductions my servo hardware wasn't even attached to a device, so I > don't really think it's doing anything except sitting there and receiving > BULK_IN commands. I'm doing this to two devices simultaneously. > I was testing with Andrzej's script against a g_zero gadget. I could trigger many similar issues as those he reported, but not this dequeue issue you see. The rewrite resolved all issues I saw. Script was running without issues over night. (tested against both USB2 and USB3). I haven't tried with two devices simultaneously, I could try that. Could you share more details about the system you have, what xhci controller do you have? Thanks -Mathias