linux-kernel - Re: [PATCH v2 1/4] gpu: nova-core: bindings: Add missing explicit padding

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Message-ID: <d428795c51caaba194685e8da40fa532b72e8088.camel@redhat.com>
Date: Tue, 25 Nov 2025 15:54:25 -0500
From: Lyude Paul <lyude@...hat.com>
To: Alexandre Courbot <acourbot@...dia.com>, Danilo Krummrich
 <dakr@...nel.org>,  Alice Ryhl <aliceryhl@...gle.com>, David Airlie
 <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,  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>,
 Trevor Gross <tmgross@...ch.edu>,  John Hubbard <jhubbard@...dia.com>,
 Alistair Popple <apopple@...dia.com>, Joel Fernandes	
 <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>, Edwin Peer	
 <epeer@...dia.com>
Cc: nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2 1/4] gpu: nova-core: bindings: Add missing explicit
 padding

Reviewed-by: Lyude Paul <lyude@...hat.com>

On Sun, 2025-11-23 at 14:12 +0900, Alexandre Courbot wrote:
> Explicit padding is needed in order to avoid uninitialized bytes and
> safely implement `AsBytes`. The `--explicit-padding` of bindgen was
> omitted by mistake when these bindings were generated.
> 
> Fixes: 13f85988d4fa ("gpu: nova-core: gsp: Retrieve GSP static info to gather GPU information")
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
>  drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs b/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
> index 5bcfbcd1ad22..5f0569dcc4a0 100644
> --- a/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
> +++ b/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
> @@ -325,6 +325,7 @@ pub struct NV0080_CTRL_GPU_GET_SRIOV_CAPS_PARAMS {
>      pub totalVFs: u32_,
>      pub firstVfOffset: u32_,
>      pub vfFeatureMask: u32_,
> +    pub __bindgen_padding_0: [u8; 4usize],
>      pub FirstVFBar0Address: u64_,
>      pub FirstVFBar1Address: u64_,
>      pub FirstVFBar2Address: u64_,
> @@ -340,6 +341,7 @@ pub struct NV0080_CTRL_GPU_GET_SRIOV_CAPS_PARAMS {
>      pub bClientRmAllocatedCtxBuffer: u8_,
>      pub bNonPowerOf2ChannelCountSupported: u8_,
>      pub bVfResizableBAR1Supported: u8_,
> +    pub __bindgen_padding_1: [u8; 7usize],
>  }
>  #[repr(C)]
>  #[derive(Debug, Default, Copy, Clone)]
> @@ -347,11 +349,13 @@ pub struct NV2080_CTRL_BIOS_GET_SKU_INFO_PARAMS {
>      pub BoardID: u32_,
>      pub chipSKU: [ffi::c_char; 9usize],
>      pub chipSKUMod: [ffi::c_char; 5usize],
> +    pub __bindgen_padding_0: [u8; 2usize],
>      pub skuConfigVersion: u32_,
>      pub project: [ffi::c_char; 5usize],
>      pub projectSKU: [ffi::c_char; 5usize],
>      pub CDP: [ffi::c_char; 6usize],
>      pub projectSKUMod: [ffi::c_char; 2usize],
> +    pub __bindgen_padding_1: [u8; 2usize],
>      pub businessCycle: u32_,
>  }
>  pub type NV2080_CTRL_CMD_FB_GET_FB_REGION_SURFACE_MEM_TYPE_FLAG = [u8_; 17usize];
> @@ -371,6 +375,7 @@ pub struct NV2080_CTRL_CMD_FB_GET_FB_REGION_FB_REGION_INFO {
>  #[derive(Debug, Default, Copy, Clone)]
>  pub struct NV2080_CTRL_CMD_FB_GET_FB_REGION_INFO_PARAMS {
>      pub numFBRegions: u32_,
> +    pub __bindgen_padding_0: [u8; 4usize],
>      pub fbRegion: [NV2080_CTRL_CMD_FB_GET_FB_REGION_FB_REGION_INFO; 16usize],
>  }
>  #[repr(C)]
> @@ -495,13 +500,16 @@ pub struct FW_WPR_LAYOUT_OFFSET {
>  #[derive(Debug, Copy, Clone)]
>  pub struct GspStaticConfigInfo_t {
>      pub grCapsBits: [u8_; 23usize],
> +    pub __bindgen_padding_0: u8,
>      pub gidInfo: NV2080_CTRL_GPU_GET_GID_INFO_PARAMS,
>      pub SKUInfo: NV2080_CTRL_BIOS_GET_SKU_INFO_PARAMS,
> +    pub __bindgen_padding_1: [u8; 4usize],
>      pub fbRegionInfoParams: NV2080_CTRL_CMD_FB_GET_FB_REGION_INFO_PARAMS,
>      pub sriovCaps: NV0080_CTRL_GPU_GET_SRIOV_CAPS_PARAMS,
>      pub sriovMaxGfid: u32_,
>      pub engineCaps: [u32_; 3usize],
>      pub poisonFuseEnabled: u8_,
> +    pub __bindgen_padding_2: [u8; 7usize],
>      pub fb_length: u64_,
>      pub fbio_mask: u64_,
>      pub fb_bus_width: u32_,
> @@ -527,16 +535,20 @@ pub struct GspStaticConfigInfo_t {
>      pub bIsMigSupported: u8_,
>      pub RTD3GC6TotalBoardPower: u16_,
>      pub RTD3GC6PerstDelay: u16_,
> +    pub __bindgen_padding_3: [u8; 2usize],
>      pub bar1PdeBase: u64_,
>      pub bar2PdeBase: u64_,
>      pub bVbiosValid: u8_,
> +    pub __bindgen_padding_4: [u8; 3usize],
>      pub vbiosSubVendor: u32_,
>      pub vbiosSubDevice: u32_,
>      pub bPageRetirementSupported: u8_,
>      pub bSplitVasBetweenServerClientRm: u8_,
>      pub bClRootportNeedsNosnoopWAR: u8_,
> +    pub __bindgen_padding_5: u8,
>      pub displaylessMaxHeads: VIRTUAL_DISPLAY_GET_NUM_HEADS_PARAMS,
>      pub displaylessMaxResolution: VIRTUAL_DISPLAY_GET_MAX_RESOLUTION_PARAMS,
> +    pub __bindgen_padding_6: [u8; 4usize],
>      pub displaylessMaxPixels: u64_,
>      pub hInternalClient: u32_,
>      pub hInternalDevice: u32_,

-- 
Cheers,
 Lyude Paul (she/her)
 Senior Software Engineer at Red Hat

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