linux-kernel - [PATCH v2 3/4] gpu: nova-core: use Alignment for alignment-related operations

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Message-Id: <20250804-num-v2-3-a96b9ca6eb02@nvidia.com>
Date: Mon, 04 Aug 2025 20:45:26 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
 Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
 Danilo Krummrich <dakr@...nel.org>
Cc: linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
 nouveau@...ts.freedesktop.org, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH v2 3/4] gpu: nova-core: use Alignment for alignment-related
 operations

Make use of the newly-available `Alignment` type and remove the
corresponding TODO item.

Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 Documentation/gpu/nova/core/todo.rst    |  1 -
 drivers/gpu/nova-core/fb.rs             |  6 +++---
 drivers/gpu/nova-core/firmware/fwsec.rs | 11 +++++------
 drivers/gpu/nova-core/vbios.rs          |  4 ++--
 4 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/Documentation/gpu/nova/core/todo.rst b/Documentation/gpu/nova/core/todo.rst
index 894a1e9c3741a43ad4eb76d24a9486862999874e..8fdb5bced3460a3971699df79ffa2c69f84b2735 100644
--- a/Documentation/gpu/nova/core/todo.rst
+++ b/Documentation/gpu/nova/core/todo.rst
@@ -147,7 +147,6 @@ Numerical operations [NUMM]
 Nova uses integer operations that are not part of the standard library (or not
 implemented in an optimized way for the kernel). These include:
 
-- Aligning up and down to a power of two,
 - The "Find Last Set Bit" (`fls` function of the C part of the kernel)
   operation.
 
diff --git a/drivers/gpu/nova-core/fb.rs b/drivers/gpu/nova-core/fb.rs
index 4a702525fff4f394b75fcf54145ba78e34a1a539..ebeffc1b1feccc5c4dc08135d8447ec185a3068a 100644
--- a/drivers/gpu/nova-core/fb.rs
+++ b/drivers/gpu/nova-core/fb.rs
@@ -3,6 +3,7 @@
 use core::ops::Range;
 
 use kernel::prelude::*;
+use kernel::ptr::Alignment;
 use kernel::sizes::*;
 use kernel::types::ARef;
 use kernel::{dev_warn, device};
@@ -130,10 +131,9 @@ pub(crate) fn new(chipset: Chipset, bar: &Bar0) -> Result<Self> {
         };
 
         let frts = {
-            const FRTS_DOWN_ALIGN: u64 = SZ_128K as u64;
+            const FRTS_DOWN_ALIGN: Alignment = Alignment::new(SZ_128K);
             const FRTS_SIZE: u64 = SZ_1M as u64;
-            // TODO[NUMM]: replace with `align_down` once it lands.
-            let frts_base = (vga_workspace.start & !(FRTS_DOWN_ALIGN - 1)) - FRTS_SIZE;
+            let frts_base = FRTS_DOWN_ALIGN.align_down(vga_workspace.start) - FRTS_SIZE;
 
             frts_base..frts_base + FRTS_SIZE
         };
diff --git a/drivers/gpu/nova-core/firmware/fwsec.rs b/drivers/gpu/nova-core/firmware/fwsec.rs
index 0dff3cfa90afee0cd4c3348023c8bfd7edccdb29..add8cea7bbecc98238d418d0fe6f235c6b850d58 100644
--- a/drivers/gpu/nova-core/firmware/fwsec.rs
+++ b/drivers/gpu/nova-core/firmware/fwsec.rs
@@ -16,6 +16,7 @@
 
 use kernel::device::{self, Device};
 use kernel::prelude::*;
+use kernel::ptr::Alignment;
 use kernel::transmute::FromBytes;
 
 use crate::dma::DmaObject;
@@ -203,7 +204,7 @@ pub(crate) struct FwsecFirmware {
 }
 
 // We need to load full DMEM pages.
-const DMEM_LOAD_SIZE_ALIGN: u32 = 256;
+const DMEM_LOAD_SIZE_ALIGN: usize = 256;
 
 impl FalconLoadParams for FwsecFirmware {
     fn imem_load_params(&self) -> FalconLoadTarget {
@@ -218,11 +219,9 @@ fn dmem_load_params(&self) -> FalconLoadTarget {
         FalconLoadTarget {
             src_start: self.desc.imem_load_size,
             dst_start: self.desc.dmem_phys_base,
-            // TODO[NUMM]: replace with `align_up` once it lands.
-            len: self
-                .desc
-                .dmem_load_size
-                .next_multiple_of(DMEM_LOAD_SIZE_ALIGN),
+            len: Alignment::new(DMEM_LOAD_SIZE_ALIGN)
+                .align_up(self.desc.dmem_load_size)
+                .unwrap_or(u32::MAX),
         }
     }
 
diff --git a/drivers/gpu/nova-core/vbios.rs b/drivers/gpu/nova-core/vbios.rs
index 5b5d9f38cbb3a6b1c374c1e0eee2509eb8d5660c..3bc24ce26b9d4d1948313f808986211facb0e8d0 100644
--- a/drivers/gpu/nova-core/vbios.rs
+++ b/drivers/gpu/nova-core/vbios.rs
@@ -10,6 +10,7 @@
 use kernel::error::Result;
 use kernel::pci;
 use kernel::prelude::*;
+use kernel::ptr::Alignment;
 
 /// The offset of the VBIOS ROM in the BAR0 space.
 const ROM_OFFSET: usize = 0x300000;
@@ -177,8 +178,7 @@ fn next(&mut self) -> Option<Self::Item> {
 
         // Advance to next image (aligned to 512 bytes).
         self.current_offset += image_size;
-        // TODO[NUMM]: replace with `align_up` once it lands.
-        self.current_offset = self.current_offset.next_multiple_of(512);
+        self.current_offset = Alignment::new(512).align_up(self.current_offset)?;
 
         Some(Ok(full_image))
     }

-- 
2.50.1