linux-kernel - [PATCH v2 08/30] gpu: nova-core: Hopper/Blackwell: skip GFW boot waiting

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Message-ID: <20260131005604.454172-9-jhubbard@nvidia.com>
Date: Fri, 30 Jan 2026 16:55:42 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Eliot Courtney <ecourtney@...dia.com>,
	Zhi Wang <zhiw@...dia.com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	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>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	nouveau@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	John Hubbard <jhubbard@...dia.com>
Subject: [PATCH v2 08/30] gpu: nova-core: Hopper/Blackwell: skip GFW boot waiting

Hopper and Blackwell GPUs use FSP-based secure boot and do not require
waiting for GFW_BOOT completion. Skip this step for these architectures.

Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 drivers/gpu/nova-core/gpu.rs | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs
index 2e7b90b80877..2ed0f6d8d19d 100644
--- a/drivers/gpu/nova-core/gpu.rs
+++ b/drivers/gpu/nova-core/gpu.rs
@@ -304,10 +304,19 @@ pub(crate) fn new<'a>(
         let chipset = spec.chipset();
 
         try_pin_init!(Self {
-            // We must wait for GFW_BOOT completion before doing any significant setup on the GPU.
+            // Turing, Ampere, Ada: we must wait for GFW_BOOT completion before doing any
+            // significant setup on the GPU.
+            //
+            // Hopper/Blackwell: skip GFW_BOOT completion waiting entirely, and use the simpler FSP
+            // Chain of Trust boot path (elsewhere) instead.
             _: {
-                gfw::wait_gfw_boot_completion(bar)
-                    .inspect_err(|_| dev_err!(pdev.as_ref(), "GFW boot did not complete\n"))?;
+                if matches!(
+                    chipset.arch(),
+                    Architecture::Turing | Architecture::Ampere | Architecture::Ada
+                ) {
+                    gfw::wait_gfw_boot_completion(bar)
+                        .inspect_err(|_| dev_err!(pdev.as_ref(), "GFW boot did not complete\n"))?;
+                }
             },
 
             sysmem_flush: SysmemFlush::register(pdev.as_ref(), bar, chipset)?,
-- 
2.52.0