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Tue, 20 Jan 2026 20:44:13 +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 20:44:13 +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 13/26] nova-core: mm: Add unified page table entry wrapper enums Date: Tue, 20 Jan 2026 15:42:50 -0500 Message-Id: <20260120204303.3229303-14-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: MN2PR01CA0064.prod.exchangelabs.com (2603:10b6:208:23f::33) To DS0PR12MB6486.namprd12.prod.outlook.com (2603:10b6:8:c5::21) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR12MB6486:EE_|PH7PR12MB6809:EE_ X-MS-Office365-Filtering-Correlation-Id: e0d5d854-ca0b-4d37-5201-08de5864ab8f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|7416014|1800799024; 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These enums allow the page table walker and VMM to work with both MMU versions. Each unified type: - Takes MmuVersion parameter in constructors - Wraps both ver2 and ver3 variants - Delegates method calls to the appropriate variant This enables version-agnostic page table operations while keeping version-specific implementation details encapsulated in the ver2 and ver3 modules. Signed-off-by: Joel Fernandes --- drivers/gpu/nova-core/mm/pagetable/mod.rs | 194 ++++++++++++++++++++++ 1 file changed, 194 insertions(+) diff --git a/drivers/gpu/nova-core/mm/pagetable/mod.rs b/drivers/gpu/nova-core/mm/pagetable/mod.rs index 3b1324add844..72bc7cda8df6 100644 --- a/drivers/gpu/nova-core/mm/pagetable/mod.rs +++ b/drivers/gpu/nova-core/mm/pagetable/mod.rs @@ -10,6 +10,10 @@ pub(crate) mod ver2; pub(crate) mod ver3; +use super::{ + Pfn, + VramAddress, // +}; use crate::gpu::Architecture; /// MMU version enumeration. @@ -168,3 +172,193 @@ fn from(val: AperturePde) -> Self { val as u8 } } + +/// Unified Page Table Entry wrapper for both MMU v2 and v3 `PTE` +/// types, allowing the walker to work with either format. +#[derive(Debug, Clone, Copy)] +pub(crate) enum Pte { + /// MMU v2 `PTE` (Turing/Ampere/Ada). + V2(ver2::Pte), + /// MMU v3 `PTE` (Hopper+). + V3(ver3::Pte), +} + +impl Pte { + /// Create a `PTE` from a raw `u64` value for the given MMU version. + pub(crate) fn new(version: MmuVersion, val: u64) -> Self { + match version { + MmuVersion::V2 => Self::V2(ver2::Pte::new(val)), + MmuVersion::V3 => Self::V3(ver3::Pte::new(val)), + } + } + + /// Create an invalid `PTE` for the given MMU version. + pub(crate) fn invalid(version: MmuVersion) -> Self { + match version { + MmuVersion::V2 => Self::V2(ver2::Pte::invalid()), + MmuVersion::V3 => Self::V3(ver3::Pte::invalid()), + } + } + + /// Create a valid `PTE` for video memory. + pub(crate) fn new_vram(version: MmuVersion, pfn: Pfn, writable: bool) -> Self { + match version { + MmuVersion::V2 => Self::V2(ver2::Pte::new_vram(pfn, writable)), + MmuVersion::V3 => Self::V3(ver3::Pte::new_vram(pfn, writable)), + } + } + + /// Check if this `PTE` is valid. + pub(crate) fn is_valid(&self) -> bool { + match self { + Self::V2(p) => p.valid(), + Self::V3(p) => p.valid(), + } + } + + /// Get the physical frame number. + pub(crate) fn frame_number(&self) -> Pfn { + match self { + Self::V2(p) => p.frame_number(), + Self::V3(p) => p.frame_number(), + } + } + + /// Get the raw `u64` value. + pub(crate) fn raw_u64(&self) -> u64 { + match self { + Self::V2(p) => p.raw_u64(), + Self::V3(p) => p.raw_u64(), + } + } +} + +impl Default for Pte { + fn default() -> Self { + Self::V2(ver2::Pte::default()) + } +} + +/// Unified Page Directory Entry wrapper for both MMU v2 and v3 `PDE`. +#[derive(Debug, Clone, Copy)] +pub(crate) enum Pde { + /// MMU v2 `PDE` (Turing/Ampere/Ada). + V2(ver2::Pde), + /// MMU v3 `PDE` (Hopper+). + V3(ver3::Pde), +} + +impl Pde { + /// Create a `PDE` from a raw `u64` value for the given MMU version. + pub(crate) fn new(version: MmuVersion, val: u64) -> Self { + match version { + MmuVersion::V2 => Self::V2(ver2::Pde::new(val)), + MmuVersion::V3 => Self::V3(ver3::Pde::new(val)), + } + } + + /// Create a valid `PDE` pointing to a page table in video memory. + pub(crate) fn new_vram(version: MmuVersion, table_pfn: Pfn) -> Self { + match version { + MmuVersion::V2 => Self::V2(ver2::Pde::new_vram(table_pfn)), + MmuVersion::V3 => Self::V3(ver3::Pde::new_vram(table_pfn)), + } + } + + /// Create an invalid `PDE` for the given MMU version. + pub(crate) fn invalid(version: MmuVersion) -> Self { + match version { + MmuVersion::V2 => Self::V2(ver2::Pde::invalid()), + MmuVersion::V3 => Self::V3(ver3::Pde::invalid()), + } + } + + /// Check if this `PDE` is valid. + pub(crate) fn is_valid(&self) -> bool { + match self { + Self::V2(p) => p.is_valid(), + Self::V3(p) => p.is_valid(), + } + } + + /// Get the VRAM address of the page table. + pub(crate) fn table_vram_address(&self) -> VramAddress { + match self { + Self::V2(p) => p.table_vram_address(), + Self::V3(p) => p.table_vram_address(), + } + } + + /// Get the raw `u64` value. + pub(crate) fn raw_u64(&self) -> u64 { + match self { + Self::V2(p) => p.raw_u64(), + Self::V3(p) => p.raw_u64(), + } + } +} + +impl Default for Pde { + fn default() -> Self { + Self::V2(ver2::Pde::default()) + } +} + +/// Unified Dual Page Directory Entry wrapper for both MMU v2 and v3 [`DualPde`]. +#[derive(Debug, Clone, Copy)] +pub(crate) enum DualPde { + /// MMU v2 [`DualPde`] (Turing/Ampere/Ada). + V2(ver2::DualPde), + /// MMU v3 [`DualPde`] (Hopper+). + V3(ver3::DualPde), +} + +impl DualPde { + /// Create a [`DualPde`] from raw 128-bit value (two `u64`s) for the given MMU version. + pub(crate) fn new(version: MmuVersion, big: u64, small: u64) -> Self { + match version { + MmuVersion::V2 => Self::V2(ver2::DualPde::new(big, small)), + MmuVersion::V3 => Self::V3(ver3::DualPde::new(big, small)), + } + } + + /// Create a [`DualPde`] with only the small page table pointer set. + pub(crate) fn new_small(version: MmuVersion, table_pfn: Pfn) -> Self { + match version { + MmuVersion::V2 => Self::V2(ver2::DualPde::new_small(table_pfn)), + MmuVersion::V3 => Self::V3(ver3::DualPde::new_small(table_pfn)), + } + } + + /// Check if the small page table pointer is valid. + pub(crate) fn has_small(&self) -> bool { + match self { + Self::V2(d) => d.has_small(), + Self::V3(d) => d.has_small(), + } + } + + /// Get the small page table VRAM address. + pub(crate) fn small_vram_address(&self) -> VramAddress { + match self { + Self::V2(d) => d.small.table_vram_address(), + Self::V3(d) => d.small.table_vram_address(), + } + } + + /// Get the raw `u64` value of the big PDE. + pub(crate) fn big_raw_u64(&self) -> u64 { + match self { + Self::V2(d) => d.big.raw_u64(), + Self::V3(d) => d.big.raw_u64(), + } + } + + /// Get the raw `u64` value of the small PDE. + pub(crate) fn small_raw_u64(&self) -> u64 { + match self { + Self::V2(d) => d.small.raw_u64(), + Self::V3(d) => d.small.raw_u64(), + } + } +} -- 2.34.1