Re: [PATCH v2 06/10] gpu: nova-core: gsp: Create rmargs

[Lyude Paul <lyude@redhat.com>]

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

On Mon, 2025-09-22 at 21:30 +1000, Alistair Popple wrote:
> Initialise the GSP resource manager arguments (rmargs) which provide
> initialisation parameters to the GSP firmware during boot. The rmargs
> structure contains arguments to configure the GSP message/command queue
> location.
> 
> These are mapped for coherent DMA and added to the libos data structure
> for access when booting GSP.
> 
> Signed-off-by: Alistair Popple <apopple@nvidia.com>
> 
> ---
> 
> Changes for v2:
>  - Rebased on Alex's latest series
> ---
>  drivers/gpu/nova-core/gsp.rs                  | 29 +++++++++++++++-
>  drivers/gpu/nova-core/gsp/cmdq.rs             | 14 ++++++--
>  drivers/gpu/nova-core/gsp/fw.rs               | 19 +++++++++++
>  .../gpu/nova-core/gsp/fw/r570_144/bindings.rs | 33 +++++++++++++++++++
>  4 files changed, 91 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/nova-core/gsp.rs b/drivers/gpu/nova-core/gsp.rs
> index 3d4028d67d2e..bb08bd537ec4 100644
> --- a/drivers/gpu/nova-core/gsp.rs
> +++ b/drivers/gpu/nova-core/gsp.rs
> @@ -17,7 +17,10 @@
>  use crate::fb::FbLayout;
>  use crate::gsp::cmdq::GspCmdq;
>  
> -use fw::LibosMemoryRegionInitArgument;
> +use fw::{
> +    LibosMemoryRegionInitArgument, GSP_ARGUMENTS_CACHED, GSP_SR_INIT_ARGUMENTS,
> +    MESSAGE_QUEUE_INIT_ARGUMENTS,
> +};
>  
>  pub(crate) mod cmdq;
>  
> @@ -33,6 +36,7 @@ pub(crate) struct Gsp {
>      pub logintr: CoherentAllocation<u8>,
>      pub logrm: CoherentAllocation<u8>,
>      pub cmdq: GspCmdq,
> +    rmargs: CoherentAllocation<GSP_ARGUMENTS_CACHED>,
>  }
>  
>  /// Creates a self-mapping page table for `obj` at its beginning.
> @@ -90,12 +94,35 @@ pub(crate) fn new(pdev: &pci::Device<device::Bound>) -> Result<impl PinInit<Self
>  
>          // Creates its own PTE array
>          let cmdq = GspCmdq::new(dev)?;
> +        let rmargs =
> +            create_coherent_dma_object::<GSP_ARGUMENTS_CACHED>(dev, "RMARGS", 1, &mut libos, 3)?;
> +        let (shared_mem_phys_addr, cmd_queue_offset, stat_queue_offset) = cmdq.get_cmdq_offsets();
> +
> +        dma_write!(
> +            rmargs[0].messageQueueInitArguments = MESSAGE_QUEUE_INIT_ARGUMENTS {
> +                sharedMemPhysAddr: shared_mem_phys_addr,
> +                pageTableEntryCount: cmdq.nr_ptes,
> +                cmdQueueOffset: cmd_queue_offset,
> +                statQueueOffset: stat_queue_offset,
> +                ..Default::default()
> +            }
> +        )?;
> +        dma_write!(
> +            rmargs[0].srInitArguments = GSP_SR_INIT_ARGUMENTS {
> +                oldLevel: 0,
> +                flags: 0,
> +                bInPMTransition: 0,
> +                ..Default::default()
> +            }
> +        )?;
> +        dma_write!(rmargs[0].bDmemStack = 1)?;
>  
>          Ok(try_pin_init!(Self {
>              libos,
>              loginit,
>              logintr,
>              logrm,
> +            rmargs,
>              cmdq,
>          }))
>      }
> diff --git a/drivers/gpu/nova-core/gsp/cmdq.rs b/drivers/gpu/nova-core/gsp/cmdq.rs
> index a9ba1a4c73d8..9170ccf4a064 100644
> --- a/drivers/gpu/nova-core/gsp/cmdq.rs
> +++ b/drivers/gpu/nova-core/gsp/cmdq.rs
> @@ -99,7 +99,6 @@ fn new(dev: &device::Device<device::Bound>) -> Result<Self> {
>          Ok(Self(gsp_mem))
>      }
>  
> -    #[expect(unused)]
>      fn dma_handle(&self) -> DmaAddress {
>          self.0.dma_handle()
>      }
> @@ -218,7 +217,7 @@ pub(crate) struct GspCmdq {
>      dev: ARef<device::Device>,
>      seq: u32,
>      gsp_mem: DmaGspMem,
> -    pub _nr_ptes: u32,
> +    pub nr_ptes: u32,
>  }
>  
>  impl GspCmdq {
> @@ -231,7 +230,7 @@ pub(crate) fn new(dev: &device::Device<device::Bound>) -> Result<GspCmdq> {
>              dev: dev.into(),
>              seq: 0,
>              gsp_mem,
> -            _nr_ptes: nr_ptes as u32,
> +            nr_ptes: nr_ptes as u32,
>          })
>      }
>  
> @@ -382,6 +381,15 @@ pub(crate) fn receive_msg_from_gsp<M: GspMessageFromGsp, R>(
>              .advance_cpu_read_ptr(msg_header.rpc.length.div_ceil(GSP_PAGE_SIZE as u32));
>          result
>      }
> +
> +    pub(crate) fn get_cmdq_offsets(&self) -> (u64, u64, u64) {
> +        (
> +            self.gsp_mem.dma_handle(),
> +            core::mem::offset_of!(Msgq, msgq) as u64,
> +            (core::mem::offset_of!(GspMem, gspq) - core::mem::offset_of!(GspMem, cpuq)
> +                + core::mem::offset_of!(Msgq, msgq)) as u64,
> +        )
> +    }
>  }
>  
>  fn decode_gsp_function(function: u32) -> &'static str {
> diff --git a/drivers/gpu/nova-core/gsp/fw.rs b/drivers/gpu/nova-core/gsp/fw.rs
> index 2e4255301e58..06841b103328 100644
> --- a/drivers/gpu/nova-core/gsp/fw.rs
> +++ b/drivers/gpu/nova-core/gsp/fw.rs
> @@ -158,9 +158,15 @@ pub(crate) fn new(gsp_firmware: &GspFirmware, fb_layout: &FbLayout) -> Self {
>  }
>  
>  pub(crate) use r570_144::{
> +    GSP_ARGUMENTS_CACHED,
> +
>      // GSP firmware constants
>      GSP_FW_WPR_META_MAGIC,
>      GSP_FW_WPR_META_REVISION,
> +    GSP_SR_INIT_ARGUMENTS,
> +
> +    // RM message queue parameters
> +    MESSAGE_QUEUE_INIT_ARGUMENTS,
>  
>      // GSP events
>      NV_VGPU_MSG_EVENT_GSP_INIT_DONE,
> @@ -313,3 +319,16 @@ pub(crate) fn new(sequence: u32, cmd_size: usize, function: u32) -> Self {
>          }
>      }
>  }
> +
> +// SAFETY: Padding is explicit and will not contain uninitialized data.
> +unsafe impl AsBytes for GSP_ARGUMENTS_CACHED {}
> +
> +// SAFETY: This struct only contains integer types for which all bit patterns
> +// are valid.
> +unsafe impl FromBytes for GSP_ARGUMENTS_CACHED {}
> +
> +// SAFETY: Padding is explicit and will not contain uninitialized data.
> +unsafe impl AsBytes for MESSAGE_QUEUE_INIT_ARGUMENTS {}
> +
> +// SAFETY: Padding is explicit and will not contain uninitialized data.
> +unsafe impl AsBytes for GSP_SR_INIT_ARGUMENTS {}
> 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 3d96d91e5b12..b87c4e6cb857 100644
> --- a/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
> +++ b/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
> @@ -319,6 +319,39 @@ fn fmt(&self, fmt: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
>  pub const NV_VGPU_MSG_EVENT_NUM_EVENTS: _bindgen_ty_3 = 4131;
>  pub type _bindgen_ty_3 = ffi::c_uint;
>  #[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct MESSAGE_QUEUE_INIT_ARGUMENTS {
> +    pub sharedMemPhysAddr: u64_,
> +    pub pageTableEntryCount: u32_,
> +    pub __bindgen_padding_0: [u8; 4usize],
> +    pub cmdQueueOffset: u64_,
> +    pub statQueueOffset: u64_,
> +}
> +#[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct GSP_SR_INIT_ARGUMENTS {
> +    pub oldLevel: u32_,
> +    pub flags: u32_,
> +    pub bInPMTransition: u8_,
> +    pub __bindgen_padding_0: [u8; 3usize],
> +}
> +#[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct GSP_ARGUMENTS_CACHED {
> +    pub messageQueueInitArguments: MESSAGE_QUEUE_INIT_ARGUMENTS,
> +    pub srInitArguments: GSP_SR_INIT_ARGUMENTS,
> +    pub gpuInstance: u32_,
> +    pub bDmemStack: u8_,
> +    pub __bindgen_padding_0: [u8; 7usize],
> +    pub profilerArgs: GSP_ARGUMENTS_CACHED__bindgen_ty_1,
> +}
> +#[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct GSP_ARGUMENTS_CACHED__bindgen_ty_1 {
> +    pub pa: u64_,
> +    pub size: u64_,
> +}
> +#[repr(C)]
>  #[derive(Copy, Clone)]
>  pub union rpc_message_rpc_union_field_v03_00 {
>      pub spare: u32_,

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

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