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Thu, 25 Mar 2021 12:42:08 +0000 Received: from DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::1c62:7fa3:617b:ab87]) by DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::1c62:7fa3:617b:ab87%6]) with mapi id 15.20.3977.029; Thu, 25 Mar 2021 12:42:08 +0000 Date: Thu, 25 Mar 2021 09:42:06 -0300 From: Jason Gunthorpe To: Christian =?utf-8?B?S8O2bmln?= Cc: Thomas =?utf-8?B?SGVsbHN0csO2bSAoSW50ZWwp?= , David Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Andrew Morton Subject: Re: [RFC PATCH 1/2] mm,drm/ttm: Block fast GUP to TTM huge pages Message-ID: <20210325124206.GA599656@nvidia.com> References: <08f19e80-d6cb-8858-0c5d-67d2e2723f72@amd.com> <730eb2ff-ba98-2393-6d42-61735e3c6b83@shipmail.org> <20210324231419.GR2356281@nvidia.com> <607ecbeb-e8a5-66e9-6fe2-9a8d22f12bc2@shipmail.org> <15da5784-96ca-25e5-1485-3ce387ee6695@shipmail.org> <20210325113023.GT2356281@nvidia.com> <20210325120103.GV2356281@nvidia.com> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Originating-IP: [206.223.160.26] X-ClientProxiedBy: CH0PR03CA0064.namprd03.prod.outlook.com (2603:10b6:610:cc::9) To DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (206.223.160.26) by CH0PR03CA0064.namprd03.prod.outlook.com (2603:10b6:610:cc::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.24 via Frontend Transport; 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The point here was that in this case, to make sure mmap uses the > > > correct VA to give us a reasonable chance of alignement, the driver might > > > need to be aware of and do trickery with the huge page-table-entry sizes > > > anyway, although I think in most cases a standard helper for this can be > > > supplied. > > Of course the driver needs some way to influence the VA mmap uses, > > gernally it should align to the natural page size of the device > > Well a mmap() needs to be aligned to the page size of the CPU, but not > necessarily to the one of the device. > > So I'm pretty sure the device driver should not be involved in any way the > choosing of the VA for the CPU mapping. No, if the device wants to use huge pages it must influence the mmap VA or it can't form huge pgaes. It is the same reason why mmap returns 2M stuff these days to make THP possible Jason 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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,SPF_HELO_NONE,SPF_PASS 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 80553C433DB for ; Thu, 25 Mar 2021 12:42:12 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4169561A1B for ; Thu, 25 Mar 2021 12:42:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4169561A1B Authentication-Results: mail.kernel.org; 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