> On 1 Sep 2026, at 13:09, Ke Sun via B4 Relay
> <[email protected]> wrote:
>
> From: Alvin Sun <[email protected]>
>
> SZ_4G is used by the Tyr driver when splitting the GPU VA range into
> user and kernel regions.
>
> Signed-off-by: Alvin Sun <[email protected]>
> ---
> rust/bindings/bindings_helper.h | 1 +
> rust/kernel/sizes.rs | 12 ++++++++++++
> 2 files changed, 13 insertions(+)
>
> diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
> index 1124785e210b3..3c37993991b1e 100644
> --- a/rust/bindings/bindings_helper.h
> +++ b/rust/bindings/bindings_helper.h
> @@ -110,6 +110,7 @@
> const size_t RUST_CONST_HELPER_ARCH_SLAB_MINALIGN = ARCH_SLAB_MINALIGN;
> const size_t RUST_CONST_HELPER_ARCH_KMALLOC_MINALIGN = ARCH_KMALLOC_MINALIGN;
> const size_t RUST_CONST_HELPER_PAGE_SIZE = PAGE_SIZE;
> +const unsigned long long RUST_CONST_HELPER_SZ_4G = SZ_4G;
> const gfp_t RUST_CONST_HELPER_GFP_ATOMIC = GFP_ATOMIC;
> const gfp_t RUST_CONST_HELPER_GFP_KERNEL = GFP_KERNEL;
> const gfp_t RUST_CONST_HELPER_GFP_KERNEL_ACCOUNT = GFP_KERNEL_ACCOUNT;
> diff --git a/rust/kernel/sizes.rs b/rust/kernel/sizes.rs
> index 521b2b38bfe77..b236573f0792e 100644
> --- a/rust/kernel/sizes.rs
> +++ b/rust/kernel/sizes.rs
> @@ -132,3 +132,15 @@ impl SizeConstants for $first {
> }
>
> define_sizes!(u32, u64, usize);
> +
> +/// Large size constants (≥ 4 GiB).
> +///
> +/// Only implemented for `u64`.
> +pub trait LargeSizeConstants {
> + /// `0x1_0000_0000`.
> + const SZ_4G: Self;
> +}
> +
> +impl LargeSizeConstants for u64 {
> + const SZ_4G: Self = bindings::SZ_4G;
> +}
>
> --
> 2.43.0
>
>
Reviewed-by: Daniel Almeida <[email protected]>
