Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753349Ab3CFCsa (ORCPT ); Tue, 5 Mar 2013 21:48:30 -0500 Received: from mail-lb0-f171.google.com ([209.85.217.171]:58721 "EHLO mail-lb0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751176Ab3CFCs3 (ORCPT ); Tue, 5 Mar 2013 21:48:29 -0500 MIME-Version: 1.0 In-Reply-To: <874ngpj3d9.fsf@meteor.durcheinandertal.bofh> References: <874ngpj3d9.fsf@meteor.durcheinandertal.bofh> Date: Wed, 6 Mar 2013 10:48:25 +0800 Message-ID: Subject: Re: Marvell 88NV9143 in mini-PCIe not working with intel_iommu=on From: Andrew Cooks To: Gaudenz Steinlin Cc: jyli@marvell.com, "open list:INTEL IOMMU (VT-d)" , open list , Shun Fu , Alex Williamson Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2731 Lines: 57 On Tue, Mar 5, 2013 at 11:03 PM, Gaudenz Steinlin wrote: > > [ Sending this to the MVUMI driver authors and the IOMMU list as I can't > tell which part is at fault. ] > > [ ... ] > [ 4.342079] dmar: DRHD: handling fault status reg 2 > [ 4.342132] dmar: DMAR:[DMA Read] Request device [02:00.0] fault addr fffff000 > [ 4.342132] DMAR:[fault reason 02] Present bit in context entry is clear > [ ... ] > [ 34.344078] mvumi 0000:02:00.1: no handshake response at state 0x2. > [ 34.344115] mvumi 0000:02:00.1: isr : global=0x0,status=0x0. > [ 34.344146] mvumi 0000:02:00.1: handshake failed at state 0x2. > [ 34.344266] mvumi: probe of 0000:02:00.1 failed with error -22 > Looks like another Marvell DMA source tag issue. > And the full lspic output for this device: > > gaudenz@meteor:~$ sudo lspci -vv -nnq -s 02: > 02:00.0 Mass storage controller [01ff]: Marvell Technology Group Ltd. Device [1b4b:91f3] > Subsystem: Marvell Technology Group Ltd. Device [1b4b:9143] > ... > Capabilities: [140 v1] Virtual Channel > Caps: LPEVC=0 RefClk=100ns PATEntryBits=1 > Arb: Fixed- WRR32- WRR64- WRR128- > Ctrl: ArbSelect=Fixed > Status: InProgress- > VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans- > Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256- > Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=01 > Status: NegoPending- InProgress- > > 02:00.1 Mass storage controller [0180]: Marvell Technology Group Ltd. Device [1b4b:9143] (rev 10) > Subsystem: Marvell Technology Group Ltd. Device [1b4b:9143] > ... > Kernel driver in use: mvumi > > 02:00.2 Non-Volatile memory controller [0108]: Marvell Technology Group Ltd. Device [1b4b:91e3] (prog-if 01) > Subsystem: Marvell Technology Group Ltd. Device [1b4b:9143] >... In this case it seems like a multifunction device with 02:00.1 being the only function that the mvumi driver cares about. So my guess is that 02:00.1 is issuing DMA with the incorrect tag of 02:00.0. Perhaps Alex Williamson can tell us about iommu device groups, whether it would be possible to group the functions together automatically and whether that would solve the problem. It should also be possible to adapt the quirk patch I posted recently to handle this, but I'm still waiting to hear if that patch has a future. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/