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dmarc=none action=none header.from=amd.com; Received: from MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) by MN2PR12MB4112.namprd12.prod.outlook.com (2603:10b6:208:19a::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.20; Wed, 26 May 2021 12:46:23 +0000 Received: from MN2PR12MB3775.namprd12.prod.outlook.com ([fe80::6d4d:4674:1cf6:8d34]) by MN2PR12MB3775.namprd12.prod.outlook.com ([fe80::6d4d:4674:1cf6:8d34%6]) with mapi id 15.20.4150.027; Wed, 26 May 2021 12:46:23 +0000 Subject: Re: [Intel-gfx] [PATCH 5/7] dma-buf: Add an API for exporting sync files (v11) To: Daniel Stone References: <20210525211753.1086069-1-jason@jlekstrand.net> <20210525211753.1086069-6-jason@jlekstrand.net> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <770eb698-1dde-9e46-da83-44911d96abec@amd.com> Date: Wed, 26 May 2021 14:46:17 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 In-Reply-To: Content-Type: text/plain; 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It's effectively the same as a poll() or I915_GEM_WAIT only, >>> instead of CPU waiting directly, it encapsulates the wait operation, at >>> the current moment in time, in a sync_file so we can check/wait on it >>> later. As long as the Vulkan driver does the sync_file export from the >>> dma-buf before we re-introduce it for rendering, it will only contain >>> fences from the compositor or display. This allows to accurately turn >>> it into a VkFence or VkSemaphore without any over- synchronization. >> Regarding that, why do we actually use a syncfile and not a drm_syncobj >> here? >> >> The later should be much closer to a Vulkan timeline semaphore. > How would we insert a syncobj+val into a resv though? Like, if we pass > an unmaterialised syncobj+val here to insert into the resv, then an > implicit-only media user (or KMS) goes to sync against the resv, what > happens? Well this is for exporting, not importing. So we don't need to worry about that. It's just my thinking because the drm_syncobj is the backing object on VkSemaphore implementations these days, isn't it? Christian. > > Cheers, > Daniel 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=-5.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,NICE_REPLY_A,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 4456BC47082 for ; Wed, 26 May 2021 12:46:30 +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 F32FF613E6 for ; Wed, 26 May 2021 12:46:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F32FF613E6 Authentication-Results: mail.kernel.org; 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