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Tue, 24 Feb 2026 22:54:01 +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 15.20.9632.017; Tue, 24 Feb 2026 22:54:01 +0000 From: Joel Fernandes To: linux-kernel@vger.kernel.org Cc: Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Dave Airlie , Daniel Almeida , Koen Koning , dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, rust-for-linux@vger.kernel.org, Nikola Djukic , 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 , Alex Gaynor , Boqun Feng , John Hubbard , Alistair Popple , Timur Tabi , Edwin Peer , Alexandre Courbot , Andrea Righi , Andy Ritger , Zhi Wang , Balbir Singh , Philipp Stanner , Elle Rhumsaa , alexeyi@nvidia.com, Eliot Courtney , joel@joelfernandes.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 v8 17/25] gpu: nova-core: mm: Add Virtual Memory Manager Date: Tue, 24 Feb 2026 17:53:15 -0500 Message-Id: <20260224225323.3312204-18-joelagnelf@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260224225323.3312204-1-joelagnelf@nvidia.com> References: <20260224225323.3312204-1-joelagnelf@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MN2PR16CA0053.namprd16.prod.outlook.com (2603:10b6:208:234::22) To DS0PR12MB6486.namprd12.prod.outlook.com (2603:10b6:8:c5::21) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR12MB6486:EE_|SN7PR12MB6885:EE_ X-MS-Office365-Filtering-Correlation-Id: 539501ac-efdb-4bd2-f857-08de73f7986d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|366016|1800799024; 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Each Vmm instance manages a single address space identified by its Page Directory Base (PDB) address, used for Channel, BAR1 and BAR2 mappings. Mapping APIs and virtual address range tracking are added in later commits. Cc: Nikola Djukic Signed-off-by: Joel Fernandes --- drivers/gpu/nova-core/mm.rs | 1 + drivers/gpu/nova-core/mm/vmm.rs | 63 +++++++++++++++++++++++++++++++++ 2 files changed, 64 insertions(+) create mode 100644 drivers/gpu/nova-core/mm/vmm.rs diff --git a/drivers/gpu/nova-core/mm.rs b/drivers/gpu/nova-core/mm.rs index 7a76af313d53..594ac93497aa 100644 --- a/drivers/gpu/nova-core/mm.rs +++ b/drivers/gpu/nova-core/mm.rs @@ -7,6 +7,7 @@ pub(crate) mod pagetable; pub(crate) mod pramin; pub(crate) mod tlb; +pub(crate) mod vmm; use kernel::{ devres::Devres, diff --git a/drivers/gpu/nova-core/mm/vmm.rs b/drivers/gpu/nova-core/mm/vmm.rs new file mode 100644 index 000000000000..0e1b0d668c57 --- /dev/null +++ b/drivers/gpu/nova-core/mm/vmm.rs @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Virtual Memory Manager for NVIDIA GPU page table management. +//! +//! The [`Vmm`] provides high-level page mapping and unmapping operations for GPU +//! virtual address spaces (Channels, BAR1, BAR2). It wraps the page table walker +//! and handles TLB flushing after modifications. + +#![allow(dead_code)] + +use kernel::{ + gpu::buddy::AllocatedBlocks, + prelude::*, // +}; + +use crate::mm::{ + pagetable::{ + walk::{PtWalk, WalkResult}, + MmuVersion, // + }, + GpuMm, + Pfn, + Vfn, + VramAddress, // +}; + +/// Virtual Memory Manager for a GPU address space. +/// +/// Each [`Vmm`] instance manages a single address space identified by its Page +/// Directory Base (`PDB`) address. The [`Vmm`] is used for Channel, BAR1 and +/// BAR2 mappings. +pub(crate) struct Vmm { + pub(crate) pdb_addr: VramAddress, + pub(crate) mmu_version: MmuVersion, + /// Page table allocations required for mappings. + page_table_allocs: KVec>>, +} + +impl Vmm { + /// Create a new [`Vmm`] for the given Page Directory Base address. + pub(crate) fn new(pdb_addr: VramAddress, mmu_version: MmuVersion) -> Result { + // Only MMU v2 is supported for now. + if mmu_version != MmuVersion::V2 { + return Err(ENOTSUPP); + } + + Ok(Self { + pdb_addr, + mmu_version, + page_table_allocs: KVec::new(), + }) + } + + /// Read the [`Pfn`] for a mapped [`Vfn`] if one is mapped. + pub(crate) fn read_mapping(&self, mm: &GpuMm, vfn: Vfn) -> Result> { + let walker = PtWalk::new(self.pdb_addr, self.mmu_version); + + match walker.walk_to_pte_lookup(mm, vfn)? { + WalkResult::Mapped { pfn, .. } => Ok(Some(pfn)), + WalkResult::Unmapped { .. } | WalkResult::PageTableMissing => Ok(None), + } + } +} -- 2.34.1