From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M Date: Thu, 21 Nov 2019 19:02:26 +0100 Message-ID: <20191121180226.GA3852@lst.de> References: <20191121072943.GA24024@lst.de> <6eec5c42-019c-a988-fc2a-cb804194683d@xenosoft.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Christian Zigotzky Cc: Robin Murphy , Christoph Hellwig , linux-arch@vger.kernel.org, darren@stevens-zone.net, mad skateman , Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Rob Herring , paulus@samba.org, rtd2@xtra.co.nz, "contact@a-eon.com" , linuxppc-dev , nsaenzjulienne@suse.de List-Id: linux-arch.vger.kernel.org On Thu, Nov 21, 2019 at 05:34:48PM +0100, Christian Zigotzky wrote: > I modified the patch and compiled a new RC8 of kernel 5.4 today. (patch > attached) > > We have to wait to Rolands test results with his SCSI PCI card. I tested it > today but my TV card doesn't work with this patch. I think we have two sorta overlapping issues here. One is that I think we need the bus_dma_limit, which should mostly help for something like a SCSI controller that doesn't need streaming mappings (btw, do we have more details on that somewhere?). And something weird with the videobuf things. Your change of the dma masks suggests that the driver doesn't do the right allocations and thus hits bounce buffering (swiotlb). We should fix that for real, but the fact that the bounce buffering itself also fails is even more interesting. Can you try this git branch: git://git.infradead.org/users/hch/misc.git fsl-dma-debugging Gitweb: http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/fsl-dma-debugging and send me the dmesg with that with your TV adapter? From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from verein.lst.de ([213.95.11.211]:47552 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726333AbfKUSCa (ORCPT ); Thu, 21 Nov 2019 13:02:30 -0500 Date: Thu, 21 Nov 2019 19:02:26 +0100 From: Christoph Hellwig Subject: Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M Message-ID: <20191121180226.GA3852@lst.de> References: <20191121072943.GA24024@lst.de> <6eec5c42-019c-a988-fc2a-cb804194683d@xenosoft.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-arch-owner@vger.kernel.org List-ID: To: Christian Zigotzky Cc: Robin Murphy , Christoph Hellwig , linux-arch@vger.kernel.org, darren@stevens-zone.net, mad skateman , Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Rob Herring , paulus@samba.org, rtd2@xtra.co.nz, "contact@a-eon.com" , linuxppc-dev , nsaenzjulienne@suse.de Message-ID: <20191121180226.RCmWUeUKe24KJBPvtTHx_9Ku579SkAF6n40QUghRc0U@z> On Thu, Nov 21, 2019 at 05:34:48PM +0100, Christian Zigotzky wrote: > I modified the patch and compiled a new RC8 of kernel 5.4 today. (patch > attached) > > We have to wait to Rolands test results with his SCSI PCI card. I tested it > today but my TV card doesn't work with this patch. I think we have two sorta overlapping issues here. One is that I think we need the bus_dma_limit, which should mostly help for something like a SCSI controller that doesn't need streaming mappings (btw, do we have more details on that somewhere?). And something weird with the videobuf things. Your change of the dma masks suggests that the driver doesn't do the right allocations and thus hits bounce buffering (swiotlb). We should fix that for real, but the fact that the bounce buffering itself also fails is even more interesting. Can you try this git branch: git://git.infradead.org/users/hch/misc.git fsl-dma-debugging Gitweb: http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/fsl-dma-debugging and send me the dmesg with that with your TV adapter?