linux-kernel - [PATCH v7 13/14] nova-core: falcon: Add support to write firmware version

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Message-Id: <20251029-gsp_boot-v7-13-34227afad347@nvidia.com>
Date: Wed, 29 Oct 2025 17:16:40 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Benno Lossin <lossin@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
 Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
 Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>
Cc: John Hubbard <jhubbard@...dia.com>, 
 Alistair Popple <apopple@...dia.com>, 
 Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>, 
 Edwin Peer <epeer@...dia.com>, nouveau@...ts.freedesktop.org, 
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 rust-for-linux@...r.kernel.org, Alexandre Courbot <acourbot@...dia.com>, 
 Lyude Paul <lyude@...hat.com>
Subject: [PATCH v7 13/14] nova-core: falcon: Add support to write firmware
 version

From: Joel Fernandes <joelagnelf@...dia.com>

This will be needed by both the GSP boot code as well as GSP resume code
in the sequencer.

Reviewed-by: Lyude Paul <lyude@...hat.com>
Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 drivers/gpu/nova-core/falcon.rs | 8 ++++++++
 drivers/gpu/nova-core/regs.rs   | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
index 45650b66fdf4..f23356bf3a2e 100644
--- a/drivers/gpu/nova-core/falcon.rs
+++ b/drivers/gpu/nova-core/falcon.rs
@@ -610,4 +610,12 @@ pub(crate) fn is_riscv_active(&self, bar: &Bar0) -> bool {
         let cpuctl = regs::NV_PRISCV_RISCV_CPUCTL::read(bar, &E::ID);
         cpuctl.active_stat()
     }
+
+    /// Write the application version to the OS register.
+    #[expect(dead_code)]
+    pub(crate) fn write_os_version(&self, bar: &Bar0, app_version: u32) {
+        regs::NV_PFALCON_FALCON_OS::default()
+            .set_value(app_version)
+            .write(bar, &E::ID);
+    }
 }
diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs
index fd207920f721..c945adf63b9e 100644
--- a/drivers/gpu/nova-core/regs.rs
+++ b/drivers/gpu/nova-core/regs.rs
@@ -216,6 +216,12 @@ pub(crate) fn vga_workspace_addr(self) -> Option<u64> {
     31:0    value as u32;
 });
 
+// Used to store version information about the firmware running
+// on the Falcon processor.
+register!(NV_PFALCON_FALCON_OS @ PFalconBase[0x00000080] {
+    31:0    value as u32;
+});
+
 register!(NV_PFALCON_FALCON_RM @ PFalconBase[0x00000084] {
     31:0    value as u32;
 });

-- 
2.51.0