From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from CY7PR03CU001.outbound.protection.outlook.com (mail-westcentralusazon11010026.outbound.protection.outlook.com [40.93.198.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 838E8282F21 for ; Mon, 14 Sep 2026 07:51:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.93.198.26 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789372274; cv=fail; b=Z7AAo3yZpBOtU4O+0O4ZWgNa7IMKstwNsrBt0L6qG+TbKwAKv2MZZ4c8mn2C2W6Lky4uxGQ3h4DFmpxbIxmLxhJXarQtgDMVGE18UtRkJ91c5GdNpsz2vwIAXb1pbeDi7MV9OFzhT/HgrvQiliHPNoENQlcZldyozygYkqft0us= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789372274; c=relaxed/simple; bh=BEnZ9y2kwDoQKvqE0EFF+q89bU6AkZjud4BrNh3PC4w=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=n7PH9fGKefd7tlpl1hBfybA56ugaxIQDqBaaipbQB9yNAqPcw/Ja+EXK4slUiOiJzaJYvY/CouPrbUpOS+yWbPqCeGXQwkTSSTWPcd/ob1HRuEH8UCNshrQvGnWo9CojMctvo01kXKl5HGgscUrZf0YRdXROQhiEenJ4x9lFIfg= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=Cti2SgqE; arc=fail smtp.client-ip=40.93.198.26 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="Cti2SgqE" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=y1WCX5IBrNZVEqtEHOS2c84I3UO9nxI8u93eAPHWCCFu+Bz9/IPGqNbDGpUR3gw7qg5c+ZdVZyt3MflWYyr0XGXVIW2N/2DW1FoRXuBYLaohTtf89AVzOBS8yOLUnzP1y8tV4G1uZNOLMS7xndZgizEUS0YCIFu8TBF4vV+kECHyvpTK9YENSoLtr2QvaEYS3wPJaXk7m/YyMl11Pqkj7P1H9srY1R1ZQfdvaq0tVqKOjUChZ3GQPgq4GAqXYZFa5ktd269cbxDJk3JUwoU8GMOsTsRyBH8fl8v1uFf2ZzMcArWt3NokhdEFji0iCYwAqLgSYg5RsMuqm0qlzLx1Iw== 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=KmSTn4DBLqZVF2JzDeHUohqPQ8Q1VmArWPB8Y1avywk=; b=Kzn9r5AZ7gInZGz99VOUlt4y7EuVde1cJxqLFBKB76bP+y32ahShkvYxLO7P2JX9pgDj5cjOVbUpXrHqrdoqbAPGZ82eh4DTMlQsUlO0Eu6QjYWAOkx2OgeCxSLZ/sOyPKd23k7LU86CLUNa3KXjLeSO575YQJsQUACxmHS0l2ZXWdQIOL7ESHA+rMAHNLGp3cCa1J4WTkXNkJMXdtFOQeRKYXkASjtMKcwxZtN8SyMFuXU3glCcNH+i9TaFBL25zHrVgx05bHiEeLHrUEAIxRkzVcYbty/lyGMSmR6s2MHtghWw8KonRGm9u05WfDF4+sbLYQrSQX+mGWXGR1OK8g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.161) smtp.rcpttodomain=kernel.org smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) 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=KmSTn4DBLqZVF2JzDeHUohqPQ8Q1VmArWPB8Y1avywk=; b=Cti2SgqESpUzFZUO18uXwjLzj0NZhpPl42ZjCWJIjkmhV7w8r/6TAX3faWlZ4WenNfHvgoGG7plu1tl4UuQxdu2a/5hRK2a3vjw1we6pNBqI7UDWCIiJKNAQsG1PlgytquBdNnpIHAQPF/DzVcTuXEAXB6JNJMK8FkvngeZHdXrc+cu8kHRJ1N8Dm2P72+2jt9/rxEg4Qnd9EWSAlje3cz8T9wYwUM38E0DG2/9k4dIdRJnfMHkNku54u2jt5q4IsORQrrRwQ03XDdJlQ625uIP9CyW8hJr5hZle4d8JjPGWr0yZCLHhSkV2wG4FUI4djwPSVGpj1O2Rp2pn03MEKQ== Received: from BN9PR03CA0374.namprd03.prod.outlook.com (2603:10b6:408:f7::19) by SJ2PR12MB7919.namprd12.prod.outlook.com (2603:10b6:a03:4cc::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.406.10; Mon, 14 Sep 2026 07:51:07 +0000 Received: from BN1PEPF0001854B.namprd05.prod.outlook.com (2603:10b6:408:f7:cafe::5e) by BN9PR03CA0374.outlook.office365.com (2603:10b6:408:f7::19) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.21.406.12 via Frontend Transport; Mon, 14 Sep 2026 07:51:07 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.161) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.161 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.161; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.161) by BN1PEPF0001854B.mail.protection.outlook.com (10.167.248.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.428.7 via Frontend Transport; Mon, 14 Sep 2026 07:51:07 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.46; Mon, 14 Sep 2026 00:50:53 -0700 Received: from rnnvmail204.nvidia.com (10.129.68.6) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.46; Mon, 14 Sep 2026 00:50:53 -0700 Received: from inno-dell.home (10.127.8.11) by mail.nvidia.com (10.129.68.6) with Microsoft SMTP Server id 15.2.2562.46 via Frontend Transport; Mon, 14 Sep 2026 00:50:44 -0700 From: Zhi Wang To: , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Zhi Wang , Alistair Popple Subject: [PATCH v2 11/32] gpu: nova-core: mm: add VramRegion Date: Mon, 14 Sep 2026 10:48:46 +0300 Message-ID: <20260914074907.1399629-12-zhiw@nvidia.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260914074907.1399629-1-zhiw@nvidia.com> References: <20260914074907.1399629-1-zhiw@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF0001854B:EE_|SJ2PR12MB7919:EE_ X-MS-Office365-Filtering-Correlation-Id: e3118039-f2bf-4b1e-f118-08df1234ef90 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|82310400026|23010399003|36860700016|11063799006|56012099006|10067099003|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(7416014)(1800799024)(82310400026)(23010399003)(36860700016)(11063799006)(56012099006)(10067099003)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Z+UbeTa50VV2EyC5d7eQO7dFyvC8MdlAUuWBCIQjiIh+E5IKFLSlki10T4gKcqtOeXPb0euqLn67Jz5hHivFK/GBA6zVBLK35ox1y5X+fjaGtZPT6B+8RtNMaWafzvi3QgcHIl79NMOhqUrwkFozv8KWR/QVhoKIr/Le+lxRaUpaKDEApuFy20oT3FAIaLG+4A1aQETqdtYoZNDmKC0oTTiBpyOx6hYf0nS1aecIxLCbuvZNQk6tsxml+CtdCGBjG+UdAOR/JlYG1zJxCVmhdQ3M0XqSlsrWdVy2urcdRmf15X9bQQF+Sryz3ABboYvHuPbUrdar6Okl1wY9JnmLjTnlfRiRMXQ/t6UZoQTjx6YY5RpK90tZ4h/WHR8/wNqzzlsjnG2D3YjsYro5zUZ9Glx7nAz5wfiRP487YxrfrrkGqoHZbBQzHppK1/qki3aF X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Sep 2026 07:51:07.4843 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e3118039-f2bf-4b1e-f118-08df1234ef90 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF0001854B.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB7919 BAR mappings do not necessarily cover an entire VRAM block. A region layer lets a mapping select a byte range while keeping the underlying allocation alive. For vGPU, communication buffers occupy only part of the management heap and need a BAR mapping of that range. Add VramRegion to describe ranges within a shared VramBlock and support bounds-checked subregions. Cc: Alistair Popple Signed-off-by: Zhi Wang --- drivers/gpu/nova-core/mm/vram.rs | 62 ++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/drivers/gpu/nova-core/mm/vram.rs b/drivers/gpu/nova-core/mm/vram.rs index 743a2a163318..2c7183f08027 100644 --- a/drivers/gpu/nova-core/mm/vram.rs +++ b/drivers/gpu/nova-core/mm/vram.rs @@ -34,6 +34,68 @@ impl VramBlock { pub(crate) const fn address(&self) -> u64 { self.address } + + /// Creates a byte range relative to this allocation, retaining its backing storage. + pub(crate) fn region(self: &Arc, range: Range) -> Result { + VramRegion::new(self.clone(), range) + } +} + +/// A byte range that keeps its VRAM allocation alive. +#[derive(Clone)] +pub(crate) struct VramRegion { + backing: Arc, + address: u64, + size: u64, +} + +impl VramRegion { + fn new(backing: Arc, range: Range) -> Result { + let size = range + .end + .checked_sub(range.start) + .filter(|size| *size != 0) + .ok_or(EINVAL)?; + if range.end > backing.size { + return Err(EINVAL); + } + let address = backing.address.checked_add(range.start).ok_or(EOVERFLOW)?; + backing.address.checked_add(range.end).ok_or(EOVERFLOW)?; + + Ok(Self { + backing, + address, + size, + }) + } + + pub(crate) const fn address(&self) -> u64 { + self.address + } + + pub(crate) const fn size(&self) -> u64 { + self.size + } + + /// Creates a nonempty subregion relative to this view's start. + pub(crate) fn subregion(&self, range: Range) -> Result { + let size = range + .end + .checked_sub(range.start) + .filter(|size| *size != 0) + .ok_or(EINVAL)?; + if range.end > self.size { + return Err(EINVAL); + } + let address = self.address.checked_add(range.start).ok_or(EOVERFLOW)?; + address.checked_add(size).ok_or(EOVERFLOW)?; + + Ok(Self { + backing: self.backing.clone(), + address, + size, + }) + } } impl GpuMm<'_> {