gpu: nova-core: falcon: add constant for memory block alignment

Falcon memory blocks are 256 bytes in size. This is a hard constant on
all models.

This value was hardcoded, so turn it into a documented constant. It will
also become useful with the PIO loading code.

Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patch.msgid.link/20260306-turing_prep-v11-2-8f0042c5d026@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
index 8d444cf9d55c15f2d47344265ab9903992afebd2..31217cd3a7957f11f149d5634f5ad00516a9bd56 100644 (file)
--- a/drivers/gpu/nova-core/falcon.rs
+++ b/drivers/gpu/nova-core/falcon.rs
@@ -25,6 +25,7 @@ use crate::{
     falcon::hal::LoadMethod,
     gpu::Chipset,
     num::{
+        self,
         FromSafeCast,
         IntoSafeCast, //
     },
@@ -36,6 +37,9 @@ pub(crate) mod gsp;
 mod hal;
 pub(crate) mod sec2;
 
+/// Alignment (in bytes) of falcon memory blocks.
+pub(crate) const MEM_BLOCK_ALIGNMENT: usize = 256;
+
 // TODO[FPRI]: Replace with `ToPrimitive`.
 macro_rules! impl_from_enum_to_u8 {
     ($enum_type:ty) => {
@@ -423,7 +427,7 @@ impl<E: FalconEngine + 'static> Falcon<E> {
         target_mem: FalconMem,
         load_offsets: FalconLoadTarget,
     ) -> Result {
-        const DMA_LEN: u32 = 256;
+        const DMA_LEN: u32 = num::usize_into_u32::<{ MEM_BLOCK_ALIGNMENT }>();
 
         // For IMEM, we want to use the start offset as a virtual address tag for each page, since
         // code addresses in the firmware (and the boot vector) are virtual.