Re: [PATCH v10 09/28] gpu: nova-core: Hopper/Blackwell: new location for PCI config mirror

["Alexandre Courbot" <acourbot@nvidia.com>]

On Sat Apr 11, 2026 at 11:49 AM JST, John Hubbard wrote:
> Hopper and Blackwell GPUs use a different PCI config space mirror
> address (0x092000) compared to older architectures (0x088000). Update
> SetSystemInfo to accept a chipset parameter and select the correct
> address based on architecture.
>
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>
> ---
>  drivers/gpu/nova-core/gsp/boot.rs        |  2 +-
>  drivers/gpu/nova-core/gsp/commands.rs    |  8 +++++---
>  drivers/gpu/nova-core/gsp/fw/commands.rs | 22 +++++++++++++++++++---
>  3 files changed, 25 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/nova-core/gsp/boot.rs b/drivers/gpu/nova-core/gsp/boot.rs
> index 18f356c9178e..1aa869693b75 100644
> --- a/drivers/gpu/nova-core/gsp/boot.rs
> +++ b/drivers/gpu/nova-core/gsp/boot.rs
> @@ -169,7 +169,7 @@ pub(crate) fn boot(
>          let wpr_meta = Coherent::init(dev, GFP_KERNEL, GspFwWprMeta::new(&gsp_fw, &fb_layout))?;
>  
>          self.cmdq
> -            .send_command_no_wait(bar, commands::SetSystemInfo::new(pdev))?;
> +            .send_command_no_wait(bar, commands::SetSystemInfo::new(pdev, chipset))?;
>          self.cmdq
>              .send_command_no_wait(bar, commands::SetRegistry::new())?;
>  
> diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/gsp/commands.rs
> index c89c7b57a751..9551a789433c 100644
> --- a/drivers/gpu/nova-core/gsp/commands.rs
> +++ b/drivers/gpu/nova-core/gsp/commands.rs
> @@ -19,6 +19,7 @@
>  
>  use crate::{
>      driver::Bar0,
> +    gpu::Chipset,
>      gsp::{
>          cmdq::{
>              Cmdq,
> @@ -37,12 +38,13 @@
>  /// The `GspSetSystemInfo` command.
>  pub(crate) struct SetSystemInfo<'a> {
>      pdev: &'a pci::Device<device::Bound>,
> +    chipset: Chipset,
>  }
>  
>  impl<'a> SetSystemInfo<'a> {
>      /// Creates a new `GspSetSystemInfo` command using the parameters of `pdev`.
> -    pub(crate) fn new(pdev: &'a pci::Device<device::Bound>) -> Self {
> -        Self { pdev }
> +    pub(crate) fn new(pdev: &'a pci::Device<device::Bound>, chipset: Chipset) -> Self {
> +        Self { pdev, chipset }
>      }
>  }
>  
> @@ -53,7 +55,7 @@ impl<'a> CommandToGsp for SetSystemInfo<'a> {
>      type InitError = Error;
>  
>      fn init(&self) -> impl Init<Self::Command, Self::InitError> {
> -        GspSetSystemInfo::init(self.pdev)
> +        GspSetSystemInfo::init(self.pdev, self.chipset)
>      }
>  }
>  
> diff --git a/drivers/gpu/nova-core/gsp/fw/commands.rs b/drivers/gpu/nova-core/gsp/fw/commands.rs
> index db46276430be..c16acbb0237f 100644
> --- a/drivers/gpu/nova-core/gsp/fw/commands.rs
> +++ b/drivers/gpu/nova-core/gsp/fw/commands.rs
> @@ -10,7 +10,13 @@
>      }, //
>  };
>  
> -use crate::gsp::GSP_PAGE_SIZE;
> +use crate::{
> +    gpu::{
> +        Architecture,
> +        Chipset, //
> +    },
> +    gsp::GSP_PAGE_SIZE, //
> +};
>  
>  use super::bindings;
>  
> @@ -24,7 +30,10 @@ pub(crate) struct GspSetSystemInfo {
>  impl GspSetSystemInfo {
>      /// Returns an in-place initializer for the `GspSetSystemInfo` command.
>      #[allow(non_snake_case)]
> -    pub(crate) fn init<'a>(dev: &'a pci::Device<device::Bound>) -> impl Init<Self, Error> + 'a {
> +    pub(crate) fn init<'a>(
> +        dev: &'a pci::Device<device::Bound>,
> +        chipset: Chipset,
> +    ) -> impl Init<Self, Error> + 'a {
>          type InnerGspSystemInfo = bindings::GspSystemInfo;
>          let init_inner = try_init!(InnerGspSystemInfo {
>              gpuPhysAddr: dev.resource_start(0)?,
> @@ -35,7 +44,14 @@ pub(crate) fn init<'a>(dev: &'a pci::Device<device::Bound>) -> impl Init<Self, E
>              // Using TASK_SIZE in r535_gsp_rpc_set_system_info() seems wrong because
>              // TASK_SIZE is per-task. That's probably a design issue in GSP-RM though.
>              maxUserVa: (1 << 47) - 4096,
> -            pciConfigMirrorBase: 0x088000,
> +            // Hopper, Blackwell, and later moved the PCI config mirror window to 0x092000.
> +            // Older architectures continue to use the legacy window at 0x088000.
> +            pciConfigMirrorBase: match chipset.arch() {
> +                Architecture::Turing | Architecture::Ampere | Architecture::Ada => 0x088000,
> +                Architecture::Hopper
> +                | Architecture::BlackwellGB10x
> +                | Architecture::BlackwellGB20x => 0x092000,
> +            },

Mmm, similarly to the previous patch, I would prefer to have this behind
a HAL, but I am not quite sure which one would fit. Any idea?