gpu: nova-core: gsp: Create wpr metadata

The GSP requires some pieces of metadata to boot. These are passed in a
struct which the GSP transfers via DMA. Create this struct and get a
handle to it for future use when booting the GSP.

Signed-off-by: Alistair Popple <[e-mail]>
Co-developed-by: Alexandre Courbot <[e-mail]>
Signed-off-by: Alexandre Courbot <[e-mail]>
Message-ID: <[e-mail]>

drivers/gpu/nova-core/fb.rs

···
 ///
 /// Contains ranges of GPU memory reserved for a given purpose during the GSP boot process.
 #[derive(Debug)]
-#[expect(dead_code)]
 pub(crate) struct FbLayout {
     /// Range of the framebuffer. Starts at `0`.
     pub(crate) fb: Range<u64>,

drivers/gpu/nova-core/firmware/gsp.rs

···
     /// Size in bytes of the firmware contained in [`Self::fw`].
     pub(crate) size: usize,
     /// Device-mapped GSP signatures matching the GPU's [`Chipset`].
-    signatures: DmaObject,
+    pub(crate) signatures: DmaObject,
     /// GSP bootloader, verifies the GSP firmware before loading and running it.
     pub(crate) bootloader: RiscvFirmware,
 }
···
         }))
     }
 
-    #[expect(unused)]
     /// Returns the DMA handle of the radix3 level 0 page table.
     pub(crate) fn radix3_dma_handle(&self) -> DmaAddress {
         self.level0.dma_handle()

drivers/gpu/nova-core/firmware/riscv.rs

···
 #[expect(unused)]
 pub(crate) struct RiscvFirmware {
     /// Offset at which the code starts in the firmware image.
-    code_offset: u32,
+    pub(crate) code_offset: u32,
     /// Offset at which the data starts in the firmware image.
-    data_offset: u32,
+    pub(crate) data_offset: u32,
     /// Offset at which the manifest starts in the firmware image.
-    manifest_offset: u32,
+    pub(crate) manifest_offset: u32,
     /// Application version.
     app_version: u32,
     /// Device-mapped firmware image.

drivers/gpu/nova-core/gsp/boot.rs

···
 
 use kernel::{
     device,
+    dma::CoherentAllocation,
+    dma_write,
     pci,
     prelude::*, //
 };
···
         FIRMWARE_VERSION, //
     },
     gpu::Chipset,
+    gsp::GspFwWprMeta,
     regs,
     vbios::Vbios,
 };
···
             sec2_falcon,
             bar,
         )?;
+
+        let wpr_meta =
+            CoherentAllocation::<GspFwWprMeta>::alloc_coherent(dev, 1, GFP_KERNEL | __GFP_ZERO)?;
+        dma_write!(wpr_meta[0] = GspFwWprMeta::new(&gsp_fw, &fb_layout))?;
 
         Ok(())
     }

drivers/gpu/nova-core/gsp/fw.rs

···
         Alignable,
         Alignment, //
     },
-    sizes::SZ_1M,
+    sizes::{
+        SZ_128K,
+        SZ_1M, //
+    },
     transmute::{
         AsBytes,
         FromBytes, //
···
 };
 
 use crate::{
+    fb::FbLayout,
+    firmware::gsp::GspFirmware,
     gpu::Chipset,
     num::{
         self,
···
 /// addresses of the GSP bootloader and firmware.
 #[repr(transparent)]
 pub(crate) struct GspFwWprMeta(bindings::GspFwWprMeta);
+
+// SAFETY: Padding is explicit and does not contain uninitialized data.
+unsafe impl AsBytes for GspFwWprMeta {}
+
+// SAFETY: This struct only contains integer types for which all bit patterns
+// are valid.
+unsafe impl FromBytes for GspFwWprMeta {}
+
+type GspFwWprMetaBootResumeInfo = r570_144::GspFwWprMeta__bindgen_ty_1;
+type GspFwWprMetaBootInfo = r570_144::GspFwWprMeta__bindgen_ty_1__bindgen_ty_1;
+
+impl GspFwWprMeta {
+    /// Fill in and return a `GspFwWprMeta` suitable for booting `gsp_firmware` using the
+    /// `fb_layout` layout.
+    pub(crate) fn new(gsp_firmware: &GspFirmware, fb_layout: &FbLayout) -> Self {
+        Self(bindings::GspFwWprMeta {
+            // CAST: we want to store the bits of `GSP_FW_WPR_META_MAGIC` unmodified.
+            magic: r570_144::GSP_FW_WPR_META_MAGIC as u64,
+            revision: u64::from(r570_144::GSP_FW_WPR_META_REVISION),
+            sysmemAddrOfRadix3Elf: gsp_firmware.radix3_dma_handle(),
+            sizeOfRadix3Elf: u64::from_safe_cast(gsp_firmware.size),
+            sysmemAddrOfBootloader: gsp_firmware.bootloader.ucode.dma_handle(),
+            sizeOfBootloader: u64::from_safe_cast(gsp_firmware.bootloader.ucode.size()),
+            bootloaderCodeOffset: u64::from(gsp_firmware.bootloader.code_offset),
+            bootloaderDataOffset: u64::from(gsp_firmware.bootloader.data_offset),
+            bootloaderManifestOffset: u64::from(gsp_firmware.bootloader.manifest_offset),
+            __bindgen_anon_1: GspFwWprMetaBootResumeInfo {
+                __bindgen_anon_1: GspFwWprMetaBootInfo {
+                    sysmemAddrOfSignature: gsp_firmware.signatures.dma_handle(),
+                    sizeOfSignature: u64::from_safe_cast(gsp_firmware.signatures.size()),
+                },
+            },
+            gspFwRsvdStart: fb_layout.heap.start,
+            nonWprHeapOffset: fb_layout.heap.start,
+            nonWprHeapSize: fb_layout.heap.end - fb_layout.heap.start,
+            gspFwWprStart: fb_layout.wpr2.start,
+            gspFwHeapOffset: fb_layout.wpr2_heap.start,
+            gspFwHeapSize: fb_layout.wpr2_heap.end - fb_layout.wpr2_heap.start,
+            gspFwOffset: fb_layout.elf.start,
+            bootBinOffset: fb_layout.boot.start,
+            frtsOffset: fb_layout.frts.start,
+            frtsSize: fb_layout.frts.end - fb_layout.frts.start,
+            gspFwWprEnd: fb_layout
+                .vga_workspace
+                .start
+                .align_down(Alignment::new::<SZ_128K>()),
+            gspFwHeapVfPartitionCount: fb_layout.vf_partition_count,
+            fbSize: fb_layout.fb.end - fb_layout.fb.start,
+            vgaWorkspaceOffset: fb_layout.vga_workspace.start,
+            vgaWorkspaceSize: fb_layout.vga_workspace.end - fb_layout.vga_workspace.start,
+            ..Default::default()
+        })
+    }
+}
 
 /// Struct containing the arguments required to pass a memory buffer to the GSP
 /// for use during initialisation.

drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs

···
 pub const GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS2_MAX_MB: u32 = 256;
 pub const GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS3_BAREMETAL_MIN_MB: u32 = 88;
 pub const GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS3_BAREMETAL_MAX_MB: u32 = 280;
+pub const GSP_FW_WPR_META_REVISION: u32 = 1;
+pub const GSP_FW_WPR_META_MAGIC: i64 = -2577556379034558285;
 pub type __u8 = ffi::c_uchar;
 pub type __u16 = ffi::c_ushort;
 pub type __u32 = ffi::c_uint;