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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 24725C4CED1 for ; Fri, 4 Oct 2019 17:10:23 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DBD7D2084D for ; Fri, 4 Oct 2019 17:10:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DBD7D2084D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 868F06B0003; Fri, 4 Oct 2019 13:10:22 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 817A86B0005; Fri, 4 Oct 2019 13:10:22 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6DF1A8E0003; Fri, 4 Oct 2019 13:10:22 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0170.hostedemail.com [216.40.44.170]) by kanga.kvack.org (Postfix) with ESMTP id 4D0D96B0003 for ; Fri, 4 Oct 2019 13:10:22 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id DF7EE5C0 for ; Fri, 4 Oct 2019 17:10:21 +0000 (UTC) X-FDA: 76006740642.06.hour54_3188f3de1d05 X-HE-Tag: hour54_3188f3de1d05 X-Filterd-Recvd-Size: 8532 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by imf40.hostedemail.com (Postfix) with ESMTP for ; Fri, 4 Oct 2019 17:10:21 +0000 (UTC) Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x94H4SXo144770 for ; Fri, 4 Oct 2019 13:10:19 -0400 Received: from e06smtp07.uk.ibm.com (e06smtp07.uk.ibm.com [195.75.94.103]) by mx0a-001b2d01.pphosted.com with ESMTP id 2ve8g2v8un-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 04 Oct 2019 13:10:19 -0400 Received: from localhost by e06smtp07.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 4 Oct 2019 18:10:12 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x94HABN026214450 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 4 Oct 2019 17:10:11 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 372CD52050; Fri, 4 Oct 2019 17:10:11 +0000 (GMT) Received: from linux.ibm.com (unknown [9.148.204.245]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTPS id 1B2F152051; Fri, 4 Oct 2019 17:10:10 +0000 (GMT) Date: Fri, 4 Oct 2019 20:10:07 +0300 From: Mike Rapoport To: Lucas Stach Cc: Russell King - ARM Linux admin , Adam Ford , Fabio Estevam , Catalin Marinas , Linux Kernel Mailing List , Christoph Hellwig , The etnaviv authors , arm-soc , Linux Memory Management List , Andrew Morton Subject: Re: [PATCH v2 00/21] Refine memblock API References: <20190928073331.GA5269@linux.ibm.com> <20191002073605.GA30433@linux.ibm.com> <20191003053451.GA23397@linux.ibm.com> <20191003084914.GV25745@shell.armlinux.org.uk> <20191003113010.GC23397@linux.ibm.com> <20191004092727.GX25745@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 19100417-0028-0000-0000-000003A61246 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19100417-0029-0000-0000-000024681DB2 Message-Id: <20191004171007.GA17825@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-10-04_10:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910040146 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Oct 04, 2019 at 03:21:03PM +0200, Lucas Stach wrote: > Am Freitag, den 04.10.2019, 10:27 +0100 schrieb Russell King - ARM > Linux admin: > > On Thu, Oct 03, 2019 at 02:30:10PM +0300, Mike Rapoport wrote: > > > On Thu, Oct 03, 2019 at 09:49:14AM +0100, Russell King - ARM Linux > > > admin wrote: > > > > On Thu, Oct 03, 2019 at 08:34:52AM +0300, Mike Rapoport wrote: > > > > > (trimmed the CC) > > > > > > > > > > On Wed, Oct 02, 2019 at 06:14:11AM -0500, Adam Ford wrote: > > > > > > On Wed, Oct 2, 2019 at 2:36 AM Mike Rapoport < > > > > > > rppt@linux.ibm.com> wrote: > > > > > > > > > > > > Before the patch: > > > > > > > > > > > > # cat /sys/kernel/debug/memblock/memory > > > > > > 0: 0x10000000..0x8fffffff > > > > > > # cat /sys/kernel/debug/memblock/reserved > > > > > > 0: 0x10004000..0x10007fff > > > > > > 34: 0x2fffff88..0x3fffffff > > > > > > > > > > > > > > > > > > After the patch: > > > > > > # cat /sys/kernel/debug/memblock/memory > > > > > > 0: 0x10000000..0x8fffffff > > > > > > # cat /sys/kernel/debug/memblock/reserved > > > > > > 0: 0x10004000..0x10007fff > > > > > > 36: 0x80000000..0x8fffffff > > > > > > > > > > I'm still not convinced that the memblock refactoring didn't > > > > > uncovered an > > > > > issue in etnaviv driver. > > > > > > > > > > Why moving the CMA area from 0x80000000 to 0x30000000 makes it > > > > > fail? > > > > > > > > I think you have that the wrong way round. > > > > > > I'm relying on Adam's reports of working and non-working versions. > > > According to that etnaviv works when CMA area is at 0x80000000 and > > > does not > > > work when it is at 0x30000000. > > > > > > He also sent logs a few days ago [1], they also confirm that. > > > > > > [1] > > > https://lore.kernel.org/linux-mm/CAHCN7xJEvS2Si=M+BYtz+kY0M4NxmqDjiX9Nwq6_3GGBh3yg=w@mail.gmail.com/ > > > > Sorry, yes, you're right. Still, I've reported this same regression > > a while back, and it's never gone away. > > > > > > > BTW, the code that complained about "command buffer outside > > > > > valid memory > > > > > window" has been removed by the commit 17e4660ae3d7 > > > > > ("drm/etnaviv: > > > > > implement per-process address spaces on MMUv2"). > > > > > > > > > > Could be that recent changes to MMU management of etnaviv > > > > > resolve the > > > > > issue? > > > > > > > > The iMX6 does not have MMUv2 hardware, it has MMUv1. With MMUv1 > > > > hardware requires command buffers within the first 2GiB of > > > > physical > > > > RAM. > > > > > > I've mentioned that patch because it removed the check for cmdbuf > > > address > > > for MMUv1: > > > > > > @@ -785,15 +768,7 @@ int etnaviv_gpu_init(struct etnaviv_gpu *gpu) > > > PAGE_SIZE); > > > if (ret) { > > > dev_err(gpu->dev, "could not create command > > > buffer\n"); > > > - goto unmap_suballoc; > > > - } > > > - > > > - if (!(gpu->identity.minor_features1 & > > > chipMinorFeatures1_MMU_VERSION) && > > > - etnaviv_cmdbuf_get_va(&gpu->buffer, &gpu- > > > >cmdbuf_mapping) > 0x80000000) { > > > - ret = -EINVAL; > > > - dev_err(gpu->dev, > > > - "command buffer outside valid memory > > > window\n"); > > > - goto free_buffer; > > > + goto fail; > > > } > > > > > > /* Setup event management */ > > > > > > > > > I really don't know how etnaviv works, so I hoped that people who > > > understand it would help. > > > > From what I can see, removing that check is a completely insane thing > > to do, and I note that these changes are _not_ described in the > > commit > > message. The problem was known about _before_ (June 22) the patch > > was > > created (July 5). > > > > Lucas, please can you explain why removing the above check, which is > > well known to correctly trigger on various platforms to prevent > > incorrect GPU behaviour, is safe? > > It isn't. It's a pretty big oversight in this commit to remove this > check. It can't be done at the same spot in the code anymore, as we > don't have a mapping context at this time anymore, but it should have > moved into etnaviv_iommu_context_init(). I'll send a patch to fix this > up. Lucas, can you make the check use SZ_2G instead of 0x80000000 and add a comment about 2G limitation of the aperture window? > Regards, > Lucas > -- Sincerely yours, Mike.