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Received: from AM6PR04MB5878.eurprd04.prod.outlook.com (20.179.0.89) by AM6PR04MB5318.eurprd04.prod.outlook.com (20.177.33.220) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2707.23; Tue, 11 Feb 2020 15:14:44 +0000 Received: from AM6PR04MB5878.eurprd04.prod.outlook.com ([fe80::bcef:1c59:7d27:d0e]) by AM6PR04MB5878.eurprd04.prod.outlook.com ([fe80::bcef:1c59:7d27:d0e%6]) with mapi id 15.20.2707.030; Tue, 11 Feb 2020 15:14:44 +0000 Subject: Re: [PATCHv9 00/12] PCI: Recode Mobiveil driver and add PCIe Gen4 driver for NXP Layerscape SoCs To: Olof Johansson , Robin Murphy References: <20191120034451.30102-1-Zhiqiang.Hou@nxp.com> <20200110153347.GA29372@e121166-lin.cambridge.arm.com> <20200210152257.GD25745@shell.armlinux.org.uk> From: Laurentiu Tudor Message-ID: Date: Tue, 11 Feb 2020 17:14:41 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 In-Reply-To: Content-Language: en-US X-ClientProxiedBy: LO2P265CA0466.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a2::22) To AM6PR04MB5878.eurprd04.prod.outlook.com (2603:10a6:20b:a2::25) MIME-Version: 1.0 Received: from [10.171.82.13] (89.37.124.34) by LO2P265CA0466.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a2::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2707.28 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData: wo0cUvBZzOcUGxI1kRpJROQpGubqwoY8gvWkTOf0FFpY0t2ioxICZ4yVGRRrwHc2qxsS+/BkL92R810iXS23E49YvnWFofNWlzzZAdgxA7U7r8cJ3dK3AvNYcQaZGgTA6bT30NgUjaID6RR7iE34Iw== X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0158cb96-689e-4f52-9fec-08d7af051fd5 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Feb 2020 15:14:44.2194 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 3thvKxcc6+j7uC+2aiYssNxTstX1s/RTYujH8nMtU6og8/xL+YXvspBfw8u257bstGDzODEaaKAHTRG2e3D15g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR04MB5318 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200211_071448_440343_A09C3B1F X-CRM114-Status: GOOD ( 21.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "mark.rutland@arm.com" , "devicetree@vger.kernel.org" , Lorenzo Pieralisi , "arnd@arndb.de" , "m.karthikeyan@mobiveil.co.in" , "linux-pci@vger.kernel.org" , "Z.q. Hou" , "l.subrahmanya@mobiveil.co.in" , "will.deacon@arm.com" , Russell King - ARM Linux admin , Li Yang , "M.h. Lian" , "robh+dt@kernel.org" , Xiaowei Bao , "catalin.marinas@arm.com" , "bhelgaas@google.com" , "andrew.murray@arm.com" , Mingkai Hu , "shawnguo@kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 11.02.2020 16:48, Olof Johansson wrote: > On Tue, Feb 11, 2020 at 5:04 AM Robin Murphy wrote: >> >> On 2020-02-11 12:13 pm, Laurentiu Tudor wrote: >> [...] >>>> This is a known issue about DPAA2 MC bus not working well with SMMU >>>> based IO mapping. Adding Laurentiu to the chain who has been looking >>>> into this issue. >>> >>> Yes, I'm closely following the issue. I actually have a workaround >>> (attached) but haven't submitted as it will probably raise a lot of >>> eyebrows. In the mean time I'm following some discussions [1][2][3] on >>> the iommu list which seem to try to tackle what appears to be a similar >>> issue but with framebuffers. My hope is that we will be able to leverage >>> whatever turns out. >> >> Indeed it's more general than framebuffers - in fact there was a >> specific requirement from the IORT side to accommodate network/storage >> controllers with in-memory firmware/configuration data/whatever set up >> by the bootloader that want to be handed off 'live' to Linux because the >> overhead of stopping and restarting them is impractical. Thus this DPAA2 >> setup is very much within scope of the desired solution, so please feel >> free to join in (particularly on the DT parts) :) > > That's a real problem that nees a solution, but that's not what's > happening here, since cold boots works fine. > > Isn't it a whole lot more likely that something isn't > reset/reinitialized properly in u-boot, such that there is lingering > state in the setup, causing this? Ok, so this is completely something else. I don't think our u-boots are designed to run in ways other than coming from hard reset. >> As for right now, note that your patch would only be a partial >> mitigation to slightly reduce the fault window but not remove it >> entirely. To be robust the SMMU driver *has* to know about live streams >> before the first arm_smmu_reset() - hence the need for generic firmware >> bindings - so doing anything from the MC driver is already too late (and >> indeed the current iommu_request_dm_for_dev() mechanism is itself a >> microcosm of the same problem). > > This is more likely a live stream that's left behind from the previous > kernel (there are some error messages about being unable to detach > domains, but the errors make it hard to tell what driver didn't unbind > enough). I also noticed those messages. Perhaps our PCI driver doesn't do all the required cleanup. > *BUT*, even with that bug, the system should reboot reliably and come > up clean. So, something isn't clearing up the state *on boot*. We do test some kexec based "soft-reset" scenarios, didn't hit your issue but instead we hit this: https://lkml.org/lkml/2018/9/21/1066 Can you please provide some more info on your scenario? --- Best Regards, Laurentiu _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel