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Tue, 20 Jan 2026 20:44:35 +0000 Received: from DS0PR12MB6486.namprd12.prod.outlook.com ([fe80::88a9:f314:c95f:8b33]) by DS0PR12MB6486.namprd12.prod.outlook.com ([fe80::88a9:f314:c95f:8b33%4]) with mapi id 15.20.9542.008; Tue, 20 Jan 2026 20:44:35 +0000 From: Joel Fernandes To: linux-kernel@vger.kernel.org Cc: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jonathan Corbet , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Huang Rui , Matthew Auld , Matthew Brost , Lucas De Marchi , =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , Helge Deller , Danilo Krummrich , Alice Ryhl , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Trevor Gross , John Hubbard , Alistair Popple , Timur Tabi , Edwin Peer , Alexandre Courbot , Andrea Righi , Andy Ritger , Zhi Wang , Alexey Ivanov , Balbir Singh , Philipp Stanner , Elle Rhumsaa , Daniel Almeida , joel@joelfernandes.org, 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, Joel Fernandes Subject: [PATCH RFC v6 26/26] nova-core: mm: Add BarUser to struct Gpu and create at boot Date: Tue, 20 Jan 2026 15:43:03 -0500 Message-Id: <20260120204303.3229303-27-joelagnelf@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260120204303.3229303-1-joelagnelf@nvidia.com> References: <20260120204303.3229303-1-joelagnelf@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MN2PR12CA0026.namprd12.prod.outlook.com (2603:10b6:208:a8::39) To DS0PR12MB6486.namprd12.prod.outlook.com (2603:10b6:8:c5::21) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR12MB6486:EE_|CY1PR12MB9651:EE_ X-MS-Office365-Filtering-Correlation-Id: f35792fe-f5ac-42ed-70ab-08de5864b8c7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014; 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The BarUser provides the BAR1 user interface for CPU access to GPU virtual memory through the GPU's MMU. The BarUser is initialized using BAR1 PDE base address from GSP static info, MMU version and BAR1 size obtained from platform device. Signed-off-by: Joel Fernandes --- drivers/gpu/nova-core/gpu.rs | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index dd05ad23f763..15d8d42ecfa8 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -26,7 +26,12 @@ commands::GetGspStaticInfoReply, Gsp, // }, - mm::GpuMm, + mm::{ + bar_user::BarUser, + pagetable::MmuVersion, + GpuMm, + VramAddress, // + }, regs, }; @@ -35,6 +40,7 @@ struct BootParams { usable_vram_start: u64, usable_vram_size: u64, + bar1_pde_base: u64, } macro_rules! define_chipset { @@ -271,6 +277,8 @@ pub(crate) struct Gpu { gsp: Gsp, /// Static GPU information from GSP. gsp_static_info: GetGspStaticInfoReply, + /// BAR1 user interface for CPU access to GPU virtual memory. + bar_user: BarUser, } impl Gpu { @@ -284,6 +292,7 @@ pub(crate) fn new<'a>( let boot_params: Cell = Cell::new(BootParams { usable_vram_start: 0, usable_vram_size: 0, + bar1_pde_base: 0, }); try_pin_init!(Self { @@ -328,6 +337,7 @@ pub(crate) fn new<'a>( boot_params.set(BootParams { usable_vram_start: usable_vram.start, usable_vram_size: usable_vram.end - usable_vram.start, + bar1_pde_base: info.bar1_pde_base(), }); info @@ -344,6 +354,16 @@ pub(crate) fn new<'a>( })? }, + // Create BAR1 user interface for CPU access to GPU virtual memory. + // Uses the BAR1 PDE base from GSP and full BAR1 size for VA space. + bar_user: { + let params = boot_params.get(); + let pdb_addr = VramAddress::new(params.bar1_pde_base); + let mmu_version = MmuVersion::from(spec.chipset.arch()); + let bar1_size = pdev.resource_len(1)?; + BarUser::new(pdb_addr, mmu_version, bar1_size)? + }, + bar: devres_bar, }) } -- 2.34.1