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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id AD49AD10F5F for ; Wed, 26 Nov 2025 15:17:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1951010E010; Wed, 26 Nov 2025 15:17:54 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.b="SpfUEvde"; dkim-atps=neutral Received: from CH1PR05CU001.outbound.protection.outlook.com (mail-northcentralusazon11010035.outbound.protection.outlook.com [52.101.193.35]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5681310E010; Wed, 26 Nov 2025 15:17:53 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=uvljQI9Ln1HCd38TN6kc9JJweH4/AsA7GpumlrJ2UT98hnRTwEMZXpjJGK7JvCwUQpSZ+pHAbYqH9Fme3UnlE8LfPhU82dKqvUePQl7X/6yBRLy+Qjn69az4+3WZsEnGXPdulnYRYqXMZC0UVpr4bE/BG7c32O4UfNffkwY+Zy9X4XXncbT5mt7lAY9yI+milZmoQ3etzGGQjMUruUgoPRpRydCW8R9sH0Q++Y8DHACcL02kIx0LSjBOm1KiJj/Sr0On9XWozBULRz9zfFnvOE7eGhzabwzWrqDAFANUgAKsbRKMjNIyT+St44icbnHf2+1zGebE0S7dYgiABxRJaA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=QiwUTwZ02EzofwNI3a+x732i6LgGSwvHLgDyOmYTH5U=; b=YONB+dcNh37q3BpEZteArAdLbYIaIC2SBCbTDlemDPNU2jTKj1YnzgUqNwCWhTws75/GkVQwneYoFmryLTOv8RiST0YFx1LqY9S5VGYQ1xKKscDg43DCLWtG+3DdbTpjpZ1KDpVAQ5lswKDz28+muRXBXU2hZJ8Y96b8QZz+ox3hf0BwYSRbl93TAYvHtnfaBIba4cUrb/90366Q/dllk5EImEknfjNP7fTYIlP6+D0wxRgjresE8ItOmgsqf1YdXb5TY40c/qsBNkEv8vl8tvk62f6ofu9z/WvWEJ6gdxrVHiTyn1ASM8LDaUj+36YGm9ysOWL2/Hih0zUkrgYmwQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=QiwUTwZ02EzofwNI3a+x732i6LgGSwvHLgDyOmYTH5U=; b=SpfUEvde3oZ1t6NWIe5/YeDahIYWgYaihRZZ0k+FrwgCQY/gHfE3UB7S38hI1N3umz6k80D8rlj4jDMetUNTkDDyepVYYx0JeBubv3ih3naUsLXZLMlNIMhIHytJCUYKW1V8toNlCRH4oe1w8olMUpzAZ4bIp4Yq9rXggjX3I6gulb8cwGXcdLSCz+uUFCWXctHA0cB2w9+6sd5RIATVjwK2YU7KfIgwk0C6wOEUDLplv5igK9GLJS3KZBtvDqYeGHaKZrTH7lMpaK/+JOroBUhHCkSXzd93ZrOGbSBYjZIXr9C9rZn56Q+iHDJNDY7cHu4PKM/CdrIXwctJYdi6Cg== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from SN7PR12MB8059.namprd12.prod.outlook.com (2603:10b6:806:32b::7) by IA1PR12MB6481.namprd12.prod.outlook.com (2603:10b6:208:3aa::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9366.11; Wed, 26 Nov 2025 15:17:43 +0000 Received: from SN7PR12MB8059.namprd12.prod.outlook.com ([fe80::4ee2:654e:1fe8:4b91]) by SN7PR12MB8059.namprd12.prod.outlook.com ([fe80::4ee2:654e:1fe8:4b91%2]) with mapi id 15.20.9366.009; Wed, 26 Nov 2025 15:17:43 +0000 Date: Wed, 26 Nov 2025 10:17:42 -0500 From: Joel Fernandes To: Zhi Wang Cc: Dave Airlie , Christian =?iso-8859-1?Q?K=F6nig?= , John Hubbard , linux-kernel@vger.kernel.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Simona Vetter , Jonathan Corbet , Alex Deucher , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Huang Rui , Matthew Auld , Matthew Brost , Lucas De Marchi , Thomas =?iso-8859-1?Q?Hellstr=F6m?= , Helge Deller , Danilo Krummrich , Alice Ryhl , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?iso-8859-1?Q?Bj=F6rn?= Roy Baron , Benno Lossin , Andreas Hindborg , Trevor Gross , Alistair Popple , Timur Tabi , Edwin Peer , Alexandre Courbot , nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org, amd-gfx@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-fbdev@vger.kernel.org Subject: Re: [PATCH] gpu: Move DRM buddy allocator one level up Message-ID: <20251126151742.GA3028@joelbox2> References: <20251124234432.1988476-1-joelagnelf@nvidia.com> <24d4f02b-8ecd-4512-a1f0-ba41684ede1d@amd.com> <9f433dee-7ad9-4d0f-8ac1-e67deb409b70@amd.com> <20251126094412.23373c13.zhiw@nvidia.com> Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20251126094412.23373c13.zhiw@nvidia.com> X-ClientProxiedBy: BL1P221CA0031.NAMP221.PROD.OUTLOOK.COM (2603:10b6:208:5b5::10) To SN7PR12MB8059.namprd12.prod.outlook.com (2603:10b6:806:32b::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN7PR12MB8059:EE_|IA1PR12MB6481:EE_ X-MS-Office365-Filtering-Correlation-Id: a6ab3c41-a2ed-43e1-8d08-08de2cfef273 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|1800799024|7416014|376014|366016|7053199007; X-Microsoft-Antispam-Message-Info: =?iso-8859-1?Q?nkruX8d5D3pqeFhUwISfYqtXKYq0/bpC0pQSu1R/RM1WgiaoIuO2Y20cxE?= =?iso-8859-1?Q?N7fV7Kn8knuBOY7dQEArLoUmmG1TwLycoBRakfSfLzOroIJgtTLfC4eLrV?= =?iso-8859-1?Q?Ys1SUZ78uuRmjB4Pd9h6XxIguZjwrSV5f72FAJE4FRJTINu4ciE5Qlsr4p?= =?iso-8859-1?Q?4ttyqjubHDT96c98NhTuYIroP2QWiNKl2qlTxx3kZpR+6kGpdImQnGTAfY?= =?iso-8859-1?Q?mrH5uq91qbRjhuEMYOc+bkTYBcLulfN36G+Agce1o8oLLdpBAsGNwCXrFf?= =?iso-8859-1?Q?Ll3MNbwYud98fGpCU383C2bSiGXrrE+Uaf7kpqvEmSPgfABGf0buc06TWM?= =?iso-8859-1?Q?ItOTPWSlY8pPpiwWzre4eQO01rJdyz+yLRw1tBEHWz+Xm8JydOQcR2DbYs?= =?iso-8859-1?Q?HWFdbIr08q5cTVMO43i9B6i37oLs7byU2djHk96hBoWX+E3nyGrMcv9zXi?= =?iso-8859-1?Q?2uKe0ccGcAjlZSudnE58DCrD7kOsSi2ZSvWt5mY0k0qbie9mAhKiRwFhsF?= =?iso-8859-1?Q?6o7YwQD1nJSnN3rW60G9lIMQ2yElwRwNPV7z2ghKA163iK/R6xi8EhsM7W?= =?iso-8859-1?Q?MvPvdKvghhEkTpGl0RAD6uztKx0oFVeMZ4ZZKvPBHQJBBIbTWGr12xpGYf?= =?iso-8859-1?Q?PRibVPwJXVwgdB7Dls3l0TAswA5jOauK9N1CNyJvFNEJ1nLApF6hq+UYMI?= =?iso-8859-1?Q?OqNQe9PFQA8GKz6PqbOVZUqa0Fu22/gxeo6/ZyPrxCBkc7FImTVkNAIvz2?= =?iso-8859-1?Q?HMa1vhSVjAHL9bVjIUEq73HpyWAG2W0ru6R5q0jB9jLHFxcyWWGSKTwCvT?= =?iso-8859-1?Q?AIbFT0TM3/2TFjVeYmdFJnV2Ba/JEP+xWZyNasbd/emaPygtgAy0K1SsBm?= =?iso-8859-1?Q?32bo3MKRLxYmN2Bi7bIHbRu3zH/ZutSNXH7Bq4gbagZ5HmQZXR1Ev+bTC9?= =?iso-8859-1?Q?2JzTT7TiIHpk7YnBlVx9vLq0C/aznSTCOwdouRnNmtjYqfykPmmIZPLnuv?= =?iso-8859-1?Q?sp58BXQjVSyu4ZUc774FMQRldNM0D0OyX0VW4I8913bOG3qAzlvHgZ1ZTj?= =?iso-8859-1?Q?sHX2g77Zbt+4V97vufl9pBdrfhV9M+3DuPVv5FdBQ/xjZyhEaRrpGqi2k7?= =?iso-8859-1?Q?GzWyPme/Tyic34jAWMxIW1OF8xyZ7nhhwchig14bD+cJaZWtjIFQZ80VnJ?= =?iso-8859-1?Q?Q5mQxXbjv/qr0NtIx8+R+RxuVz9YA2NSy6aec7AzVsDefRuHP4tZteC0aW?= =?iso-8859-1?Q?03gRnJTZs6tnJMzAexpDyJd87RK7QbC1TLthry68zFn2i5ZWHjq/85O0ia?= =?iso-8859-1?Q?c7/b7SePsL4L3LPwVzG7+BSCuDDiTOIKpJPq1zXV++Ml6XrqiTbsMYY7OU?= =?iso-8859-1?Q?VQRGZ0aKb7OWgWAPCR7Db/xe5syv44KmcJAil0Co5hkCH99nfWkzv1OG2G?= =?iso-8859-1?Q?IA02vm+A1P8tna+YCgQoOmT+D4V7Cc2iim9ABEQGMtV2yras2l/d6IEfqS?= =?iso-8859-1?Q?bn9+BOxqmSTsAwB5PcSKC7?= X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:SN7PR12MB8059.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230040)(1800799024)(7416014)(376014)(366016)(7053199007); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?iso-8859-1?Q?tdzFpLTNuGSX9LdKH2oXzkMMv3I4SdwShh7FMp7cq4JwBYBODFQU70cSdX?= =?iso-8859-1?Q?NA/AINiPmtKZH6S9Ha/qXLrcLAlP8xZ/2SpwnGeWuC5rC8AWPZiC0Z56ny?= =?iso-8859-1?Q?ZufihrgQ3KJiiBvlMLP6I58BIpJyQTPSn/VRVCJNrW8AVSD1dwDX1I6Qao?= =?iso-8859-1?Q?aq5Dutjy3Ns2D/WE84fJecDmQbPdRv3MNVJcC32lO5E8wjytUbce5LH4Ud?= =?iso-8859-1?Q?4L67mHz/hFoDl9VaTIxk5f/9nG+T1KAqRTSLrBYl2oDycts0Hm7s3XJ0nC?= =?iso-8859-1?Q?m44dqEcXRj4GMvLSHlKLoxrl+tx6SZ3v9FSr+nHlPJizxcycywz0OzTDov?= =?iso-8859-1?Q?VdwgzJaje3DeVcIzDGFbpIjk7isAlFfEcaYn8NBj/wmHVQatZbtQ/NZwPh?= =?iso-8859-1?Q?+nYVhVLGGAeWxhcfnveJlqhvSAEepxBdsmtejamRfOk67tVzzIWOyw1igM?= =?iso-8859-1?Q?7DckaqkeHdh6n/OEr2QcGrpHHtpSGvjTP/pgxuEtGgQoOzwj1voq6t/3YL?= =?iso-8859-1?Q?yQu93RpjdcDfm+E0KtGOY9BnQXwBAHdheD/wp7tw+aCxlmxkjllN8AwQer?= =?iso-8859-1?Q?s2Oldi057K/UEuRd+cTGVBe63pQ1UgRTyvMohGcrLH9df4MyVkUcnkWsnv?= =?iso-8859-1?Q?WuDRaOuKfJtwk80AWaYIEDqjBkQJx4iKiO664uIdQAwCVqFtZhOjAl8NLj?= =?iso-8859-1?Q?9sbaEFoEuA8mWobhW6eFUP54b1meom318awcdQXwpNsvwSPXeMBB7jyHgy?= =?iso-8859-1?Q?SwkGoT+Bz8eSM+vcZjeJvozhQSFSRrKSOQUkwr2+hrT7mBhpsEacsncdyV?= =?iso-8859-1?Q?OtjojXScotfcOQFIpVojLeYQ9OylmLrZOQi0jLMkBGlFRr054TrPtv4Mew?= =?iso-8859-1?Q?+vPIirXy3K9yh6UiNYtj72OxXmREPHzHQ9zVq+qy8F9bKBEA+3sFJ9fR0x?= =?iso-8859-1?Q?68UDVM5eviCNKS91BMs/NQOd8XsRPXBE+MHGF2WDJpSJrouyExPezlRk5l?= =?iso-8859-1?Q?OohW2cX9rOqXGW2IpgVZT2PlGvz5CXPY70Imx6OmSGbjyLIx1v4paQ2VYM?= =?iso-8859-1?Q?rCSGKrlrkhyjFX1Px6NxxYRhS/hLsHWcdycdE2ccfQtAbgZuqffu3UZBMe?= =?iso-8859-1?Q?84Xa/xBHW4NoX+NTbaMqd8UdbUPuuzzYWexqFCzutIrM1tdx/6ZAdSUpjB?= =?iso-8859-1?Q?RfzouuSZLQVyVur8JY6IEctCwYQbevVHJ0mRcxSwlewQy6QvnEpjt0KgV6?= =?iso-8859-1?Q?wakGRkhzFc5k3A7+nShEYyG9D5nUoVr+C2e98k7NX5q4Jj8VMbyr5FR52G?= =?iso-8859-1?Q?0aY4ZyEof4LHEZj3uIKEqdg9uaEFfJq3DTE1clx5JFDnsNQjYYcq//NUG/?= =?iso-8859-1?Q?pFjUkeIhFyi0iAKr5kobqfSbQ45r82mnw5sXJ4QGgYLn6w3RC96EUqwnCw?= =?iso-8859-1?Q?eycsuTJaxHANNZ1IZXRF63ZlrVag5V9DcCeNItaQA2sIsHVRiJfjkNoAEm?= =?iso-8859-1?Q?jUX6vb8+lCIpg4XEA53v61TMexOTdgYcijHYLmWIz4UquUO83uOuYbpinJ?= =?iso-8859-1?Q?lX61S4OptRDlTXlaESQ0b7ZBt2Tbg6Pw3ycvAvAKzTmOtktTrj+gZfy3ib?= =?iso-8859-1?Q?ZnPynUgrEmt3w0HlmZNmhBWOBmmBFbjN6E?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: a6ab3c41-a2ed-43e1-8d08-08de2cfef273 X-MS-Exchange-CrossTenant-AuthSource: SN7PR12MB8059.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Nov 2025 15:17:43.5724 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: FhIKFgoCzSHJXM0Okdr3oDVxh/NhNk2qO9++hjARWoTe7qerNHVWLuwMDz3p3pMoMR/CdsGOjfRvfPWTp6qzhQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6481 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Wed, Nov 26, 2025 at 09:44:12AM +0200, Zhi Wang wrote: > On Wed, 26 Nov 2025 06:17:25 +1000 > Dave Airlie wrote: > > > On Tue, 25 Nov 2025 at 19:15, Christian König > > wrote: > > > > > > On 11/25/25 10:08, Dave Airlie wrote: > > snip > > > So far I haven't heard anything about needing dma-buf interactions at > > that level, and maybe Zhi has more insight into the future there. > > > > For VFIO parts, the vendor VFIO driver relies on the core driver's support > to export the VM's framebuffer to the userspace either as type a) > VFIO_GFX_PLANE_TYPE_REGION, framebuffer as a region or b) > VFIO_GFX_PLANE_TYPE_DMABUF, framebuffer as a dmabuf, which is usually > backed by a GEM object. > > NVIDIA vGPU uses VFIO_GFX_PLANE_TYPE_REGION, so dma-buf interactions > are not required. Good to know. Also looking at Nouveau, the "core" part of that driver (nvkm) does not use dmabuf, it is only the DRM parts. It is unlikely nova-core will have to deal with dmabufs or gem objects AFAICS. That's a DRM thing. thanks, - Joel