[PATCH v10 16/28] gpu: nova-core: Hopper/Blackwell: add FMC firmware image, in support of FSP

[John Hubbard <jhubbard@nvidia.com>]

FSP is the Falcon that runs FMC firmware on Hopper and Blackwell.
Load the FMC ELF in two forms: the image section that FSP boots from,
and the full Firmware object for later signature extraction during
Chain of Trust verification.

Co-developed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 drivers/gpu/nova-core/firmware.rs     |  1 +
 drivers/gpu/nova-core/firmware/fsp.rs | 45 +++++++++++++++++++++++++++
 drivers/gpu/nova-core/gsp/boot.rs     |  3 ++
 3 files changed, 49 insertions(+)
 create mode 100644 drivers/gpu/nova-core/firmware/fsp.rs

diff --git a/drivers/gpu/nova-core/firmware.rs b/drivers/gpu/nova-core/firmware.rs
index bc217bfc225f..bc26807116e4 100644
--- a/drivers/gpu/nova-core/firmware.rs
+++ b/drivers/gpu/nova-core/firmware.rs
@@ -27,6 +27,7 @@
 };
 
 pub(crate) mod booter;
+pub(crate) mod fsp;
 pub(crate) mod fwsec;
 pub(crate) mod gsp;
 pub(crate) mod riscv;
diff --git a/drivers/gpu/nova-core/firmware/fsp.rs b/drivers/gpu/nova-core/firmware/fsp.rs
new file mode 100644
index 000000000000..3968bacb7e61
--- /dev/null
+++ b/drivers/gpu/nova-core/firmware/fsp.rs
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! FSP is a hardware unit that runs FMC firmware.
+
+use kernel::{
+    device,
+    dma::Coherent,
+    firmware::Firmware,
+    prelude::*, //
+};
+
+use crate::{
+    firmware::elf,
+    gpu::Chipset, //
+};
+
+#[expect(dead_code)]
+pub(crate) struct FspFirmware {
+    /// FMC firmware image data (only the "image" ELF section).
+    pub(crate) fmc_image: Coherent<[u8]>,
+    /// Full FMC ELF for signature extraction.
+    pub(crate) fmc_elf: Firmware,
+}
+
+impl FspFirmware {
+    pub(crate) fn new(
+        dev: &device::Device<device::Bound>,
+        chipset: Chipset,
+        ver: &str,
+    ) -> Result<Self> {
+        let fw = super::request_firmware(dev, chipset, "fmc", ver)?;
+
+        // FSP expects only the "image" section, not the entire ELF file.
+        let fmc_image_data = elf::elf_section(fw.data(), "image").ok_or_else(|| {
+            dev_err!(dev, "FMC ELF file missing 'image' section\n");
+            EINVAL
+        })?;
+        let fmc_image = Coherent::from_slice(dev, fmc_image_data, GFP_KERNEL)?;
+
+        Ok(Self {
+            fmc_image,
+            fmc_elf: fw,
+        })
+    }
+}
diff --git a/drivers/gpu/nova-core/gsp/boot.rs b/drivers/gpu/nova-core/gsp/boot.rs
index 84943beee9ca..1998bd230185 100644
--- a/drivers/gpu/nova-core/gsp/boot.rs
+++ b/drivers/gpu/nova-core/gsp/boot.rs
@@ -24,6 +24,7 @@
             BooterFirmware,
             BooterKind, //
         },
+        fsp::FspFirmware,
         fwsec::{
             bootloader::FwsecFirmwareWithBl,
             FwsecCommand,
@@ -206,6 +207,8 @@ fn boot_via_fsp(
     ) -> Result {
         let _fsp_falcon = Falcon::<FspEngine>::new(dev, chipset)?;
 
+        let _fsp_fw = FspFirmware::new(dev, chipset, FIRMWARE_VERSION)?;
+
         Err(ENOTSUPP)
     }
 
-- 
2.53.0