[PATCH v13 5/9] gpu: nova-core: Hopper/Blackwell: select FSP Chain of Trust version

[Alexandre Courbot]

From: John Hubbard <jhubbard@xxxxxxxxxx>

The FSP Chain of Trust handshake is versioned: Hopper speaks version 1
and Blackwell speaks version 2. Provide the version through the FSP HAL
so the boot message carries the value FSP expects, and so chipsets that
do not use FSP need not express a version at all.

Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: Eliot Courtney <ecourtney@xxxxxxxxxx>
Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
---
 drivers/gpu/nova-core/fsp/hal.rs       |  8 +++++++-
 drivers/gpu/nova-core/fsp/hal/gb100.rs | 23 +++++++++++++++++++++++
 drivers/gpu/nova-core/fsp/hal/gb202.rs |  4 ++++
 drivers/gpu/nova-core/fsp/hal/gh100.rs | 15 ++++++++++++---
 4 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/nova-core/fsp/hal.rs b/drivers/gpu/nova-core/fsp/hal.rs
index fc5ebb749c59..8aebe1800a64 100644
--- a/drivers/gpu/nova-core/fsp/hal.rs
+++ b/drivers/gpu/nova-core/fsp/hal.rs
@@ -9,19 +9,25 @@
     },
 };
 
+mod gb100;
 mod gb202;
 mod gh100;
 
 pub(super) trait FspHal {
     /// Returns the secure boot status from the architecture-specific `NV_THERM_I2CS_SCRATCH` register.
     fn fsp_boot_status(&self, bar: &Bar0) -> u32;
+
+    /// Returns the FSP Chain of Trust protocol version this chipset advertises.
+    #[expect(dead_code)]
+    fn cot_version(&self) -> u16;
 }
 
 /// Returns the FSP HAL, or `None` if the architecture doesn't support FSP.
 pub(super) fn fsp_hal(chipset: Chipset) -> Option<&'static dyn FspHal> {
     match chipset.arch() {
         Architecture::Turing | Architecture::Ampere | Architecture::Ada => None,
-        Architecture::Hopper | Architecture::BlackwellGB10x => Some(gh100::GH100_HAL),
+        Architecture::Hopper => Some(gh100::GH100_HAL),
+        Architecture::BlackwellGB10x => Some(gb100::GB100_HAL),
         Architecture::BlackwellGB20x => Some(gb202::GB202_HAL),
     }
 }
diff --git a/drivers/gpu/nova-core/fsp/hal/gb100.rs b/drivers/gpu/nova-core/fsp/hal/gb100.rs
new file mode 100644
index 000000000000..d50aaba0a84f
--- /dev/null
+++ b/drivers/gpu/nova-core/fsp/hal/gb100.rs
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+// SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+use crate::{
+    driver::Bar0,
+    fsp::hal::FspHal, //
+};
+
+struct Gb100;
+
+impl FspHal for Gb100 {
+    fn fsp_boot_status(&self, bar: &Bar0) -> u32 {
+        // GB10x shares Hopper's FSP secure boot status register.
+        super::gh100::fsp_boot_status_gh100(bar)
+    }
+
+    fn cot_version(&self) -> u16 {
+        2
+    }
+}
+
+const GB100: Gb100 = Gb100;
+pub(super) const GB100_HAL: &dyn FspHal = &GB100;
diff --git a/drivers/gpu/nova-core/fsp/hal/gb202.rs b/drivers/gpu/nova-core/fsp/hal/gb202.rs
index 2f08b6c9f308..2bca76c8fd64 100644
--- a/drivers/gpu/nova-core/fsp/hal/gb202.rs
+++ b/drivers/gpu/nova-core/fsp/hal/gb202.rs
@@ -17,6 +17,10 @@ fn fsp_boot_status(&self, bar: &Bar0) -> u32 {
             .fsp_boot_complete()
             .into()
     }
+
+    fn cot_version(&self) -> u16 {
+        2
+    }
 }
 
 const GB202: Gb202 = Gb202;
diff --git a/drivers/gpu/nova-core/fsp/hal/gh100.rs b/drivers/gpu/nova-core/fsp/hal/gh100.rs
index 290fb55a81da..c38a7e96eb60 100644
--- a/drivers/gpu/nova-core/fsp/hal/gh100.rs
+++ b/drivers/gpu/nova-core/fsp/hal/gh100.rs
@@ -11,11 +11,20 @@
 
 struct Gh100;
 
+/// Reads the FSP secure boot status from the Hopper/GB10x thermal scratch register.
+pub(super) fn fsp_boot_status_gh100(bar: &Bar0) -> u32 {
+    bar.read(regs::gh100::NV_THERM_I2CS_SCRATCH_FSP_BOOT_COMPLETE)
+        .fsp_boot_complete()
+        .into()
+}
+
 impl FspHal for Gh100 {
     fn fsp_boot_status(&self, bar: &Bar0) -> u32 {
-        bar.read(regs::gh100::NV_THERM_I2CS_SCRATCH_FSP_BOOT_COMPLETE)
-            .fsp_boot_complete()
-            .into()
+        fsp_boot_status_gh100(bar)
+    }
+
+    fn cot_version(&self) -> u16 {
+        1
     }
 }
 

-- 
2.54.0