gpu: nova-core: add initial driver stub

Add the initial nova-core driver stub.

nova-core is intended to serve as a common base for nova-drm (the
corresponding DRM driver) and the vGPU manager VFIO driver, serving as a
hard- and firmware abstraction layer for GSP-based NVIDIA GPUs.

The Nova project, including nova-core and nova-drm, in the long term,
is intended to serve as the successor of Nouveau for all GSP-based GPUs.

The motivation for both, starting a successor project for Nouveau and
doing so using the Rust programming language, is documented in detail
through a previous post on the mailing list [1], an LWN article [2] and a
talk from LPC '24.

In order to avoid the chicken and egg problem to require a user to
upstream Rust abstractions, but at the same time require the Rust
abstractions to implement the driver, nova-core kicks off as a driver
stub and is subsequently developed upstream.

Link: https://lore.kernel.org/dri-devel/Zfsj0_tb-0-tNrJy@cassiopeiae/T/#u [1]
Link: https://lwn.net/Articles/990736/ [2]
Link: https://youtu.be/3Igmx28B3BQ?si=sBdSEer4tAPKGpOs [3]
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://lore.kernel.org/r/20250306222336.23482-5-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/gpu/nova-core/firmware.rs b/drivers/gpu/nova-core/firmware.rs
new file mode 100644
index 000000000000..6e6361c59ca1
--- /dev/null
+++ b/drivers/gpu/nova-core/firmware.rs
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+
+use crate::gpu;
+use kernel::firmware;
+
+pub(crate) struct ModInfoBuilder<const N: usize>(firmware::ModInfoBuilder<N>);
+
+impl<const N: usize> ModInfoBuilder<N> {
+    const VERSION: &'static str = "535.113.01";
+
+    const fn make_entry_file(self, chipset: &str, fw: &str) -> Self {
+        ModInfoBuilder(
+            self.0
+                .new_entry()
+                .push("nvidia/")
+                .push(chipset)
+                .push("/gsp/")
+                .push(fw)
+                .push("-")
+                .push(Self::VERSION)
+                .push(".bin"),
+        )
+    }
+
+    const fn make_entry_chipset(self, chipset: &str) -> Self {
+        self.make_entry_file(chipset, "booter_load")
+            .make_entry_file(chipset, "booter_unload")
+            .make_entry_file(chipset, "bootloader")
+            .make_entry_file(chipset, "gsp")
+    }
+
+    pub(crate) const fn create(
+        module_name: &'static kernel::str::CStr,
+    ) -> firmware::ModInfoBuilder<N> {
+        let mut this = Self(firmware::ModInfoBuilder::new(module_name));
+        let mut i = 0;
+
+        while i < gpu::Chipset::NAMES.len() {
+            this = this.make_entry_chipset(gpu::Chipset::NAMES[i]);
+            i += 1;
+        }
+
+        this.0
+    }
+}