gpu: nova-core: compute layout of more framebuffer regions required for GSP

Compute more of the required FB layout information to boot the GSP
firmware.

This information is dependent on the firmware itself, so first we need
to import and abstract the required firmware bindings in the `nvfw`
module.

Then, a new FB HAL method is introduced in `fb::hal` that uses these
bindings and hardware information to compute the correct layout
information.

This information is then used in `fb` and the result made visible in
`FbLayout`.

These 3 things are grouped into the same patch to avoid lots of unused
warnings that would be tedious to work around. As they happen in
different files, they should not be too difficult to track separately.

Acked-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Message-ID: <20251110-gsp_boot-v9-1-8ae4058e3c0e@nvidia.com>

1 files changed, 112 insertions, 1 deletions

diff --git a/drivers/gpu/nova-core/gsp/fw.rs b/drivers/gpu/nova-core/gsp/fw.rs
index 34226dd00982..436c00d07b16 100644
--- a/drivers/gpu/nova-core/gsp/fw.rs
+++ b/drivers/gpu/nova-core/gsp/fw.rs
@@ -3,5 +3,116 @@
 mod r570_144;
 
 // Alias to avoid repeating the version number with every use.
-#[expect(unused)]
 use r570_144 as bindings;
+
+use core::ops::Range;
+
+use kernel::{
+    ptr::{
+        Alignable,
+        Alignment, //
+    },
+    sizes::SZ_1M,
+};
+
+use crate::{
+    gpu::Chipset,
+    num::{
+        self,
+        FromSafeCast, //
+    },
+};
+
+/// Empty type to group methods related to heap parameters for running the GSP firmware.
+enum GspFwHeapParams {}
+
+/// Minimum required alignment for the GSP heap.
+const GSP_HEAP_ALIGNMENT: Alignment = Alignment::new::<{ 1 << 20 }>();
+
+impl GspFwHeapParams {
+    /// Returns the amount of GSP-RM heap memory used during GSP-RM boot and initialization (up to
+    /// and including the first client subdevice allocation).
+    fn base_rm_size(_chipset: Chipset) -> u64 {
+        // TODO: this needs to be updated to return the correct value for Hopper+ once support for
+        // them is added:
+        // u64::from(bindings::GSP_FW_HEAP_PARAM_BASE_RM_SIZE_GH100)
+        u64::from(bindings::GSP_FW_HEAP_PARAM_BASE_RM_SIZE_TU10X)
+    }
+
+    /// Returns the amount of heap memory required to support a single channel allocation.
+    fn client_alloc_size() -> u64 {
+        u64::from(bindings::GSP_FW_HEAP_PARAM_CLIENT_ALLOC_SIZE)
+            .align_up(GSP_HEAP_ALIGNMENT)
+            .unwrap_or(u64::MAX)
+    }
+
+    /// Returns the amount of memory to reserve for management purposes for a framebuffer of size
+    /// `fb_size`.
+    fn management_overhead(fb_size: u64) -> u64 {
+        let fb_size_gb = fb_size.div_ceil(u64::from_safe_cast(kernel::sizes::SZ_1G));
+
+        u64::from(bindings::GSP_FW_HEAP_PARAM_SIZE_PER_GB_FB)
+            .saturating_mul(fb_size_gb)
+            .align_up(GSP_HEAP_ALIGNMENT)
+            .unwrap_or(u64::MAX)
+    }
+}
+
+/// Heap memory requirements and constraints for a given version of the GSP LIBOS.
+pub(crate) struct LibosParams {
+    /// The base amount of heap required by the GSP operating system, in bytes.
+    carveout_size: u64,
+    /// The minimum and maximum sizes allowed for the GSP FW heap, in bytes.
+    allowed_heap_size: Range<u64>,
+}
+
+impl LibosParams {
+    /// Version 2 of the GSP LIBOS (Turing and GA100)
+    const LIBOS2: LibosParams = LibosParams {
+        carveout_size: num::u32_as_u64(bindings::GSP_FW_HEAP_PARAM_OS_SIZE_LIBOS2),
+        allowed_heap_size: num::u32_as_u64(bindings::GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS2_MIN_MB)
+            * num::usize_as_u64(SZ_1M)
+            ..num::u32_as_u64(bindings::GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS2_MAX_MB)
+                * num::usize_as_u64(SZ_1M),
+    };
+
+    /// Version 3 of the GSP LIBOS (GA102+)
+    const LIBOS3: LibosParams = LibosParams {
+        carveout_size: num::u32_as_u64(bindings::GSP_FW_HEAP_PARAM_OS_SIZE_LIBOS3_BAREMETAL),
+        allowed_heap_size: num::u32_as_u64(
+            bindings::GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS3_BAREMETAL_MIN_MB,
+        ) * num::usize_as_u64(SZ_1M)
+            ..num::u32_as_u64(bindings::GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS3_BAREMETAL_MAX_MB)
+                * num::usize_as_u64(SZ_1M),
+    };
+
+    /// Returns the libos parameters corresponding to `chipset`.
+    pub(crate) fn from_chipset(chipset: Chipset) -> &'static LibosParams {
+        if chipset < Chipset::GA102 {
+            &Self::LIBOS2
+        } else {
+            &Self::LIBOS3
+        }
+    }
+
+    /// Returns the amount of memory (in bytes) to allocate for the WPR heap for a framebuffer size
+    /// of `fb_size` (in bytes) for `chipset`.
+    pub(crate) fn wpr_heap_size(&self, chipset: Chipset, fb_size: u64) -> u64 {
+        // The WPR heap will contain the following:
+        // LIBOS carveout,
+        self.carveout_size
+            // RM boot working memory,
+            .saturating_add(GspFwHeapParams::base_rm_size(chipset))
+            // One RM client,
+            .saturating_add(GspFwHeapParams::client_alloc_size())
+            // Overhead for memory management.
+            .saturating_add(GspFwHeapParams::management_overhead(fb_size))
+            // Clamp to the supported heap sizes.
+            .clamp(self.allowed_heap_size.start, self.allowed_heap_size.end - 1)
+    }
+}
+
+/// Structure passed to the GSP bootloader, containing the framebuffer layout as well as the DMA
+/// addresses of the GSP bootloader and firmware.
+#[repr(transparent)]
+pub(crate) struct GspFwWprMeta(bindings::GspFwWprMeta);