linux-kernel - [PATCH 05/17] nova-core: gsp: Add support for checking if GSP reloaded

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Message-Id: <20250829173254.2068763-6-joelagnelf@nvidia.com>
Date: Fri, 29 Aug 2025 13:32:42 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	dakr@...nel.org,
	acourbot@...dia.com
Cc: Alistair Popple <apopple@...dia.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	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>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	John Hubbard <jhubbard@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>,
	joel@...lfernandes.org,
	nouveau@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org
Subject: [PATCH 05/17] nova-core: gsp: Add support for checking if GSP reloaded

During the sequencer process, we need to check if GSP was successfully
reloaded. Add functionality to check for the same.

Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
---
 drivers/gpu/nova-core/falcon/gsp.rs | 17 +++++++++++++++++
 drivers/gpu/nova-core/regs.rs       |  6 ++++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/gpu/nova-core/falcon/gsp.rs b/drivers/gpu/nova-core/falcon/gsp.rs
index f17599cb49fa..58478ada6d3e 100644
--- a/drivers/gpu/nova-core/falcon/gsp.rs
+++ b/drivers/gpu/nova-core/falcon/gsp.rs
@@ -1,9 +1,13 @@
 // SPDX-License-Identifier: GPL-2.0
 
+use kernel::prelude::*;
+use kernel::time::Delta;
+
 use crate::{
     driver::Bar0,
     falcon::{Falcon, FalconEngine, PFalcon2Base, PFalconBase},
     regs::{self, macros::RegisterBase},
+    util::wait_on,
 };
 
 /// Type specifying the `Gsp` falcon engine. Cannot be instantiated.
@@ -29,4 +33,17 @@ pub(crate) fn clear_swgen0_intr(&self, bar: &Bar0) {
             .set_swgen0(true)
             .write(bar, &Gsp::ID);
     }
+
+    /// Function to check if GSP reload/resume has completed during the boot process.
+    #[expect(dead_code)]
+    pub(crate) fn check_reload_completed(&self, bar: &Bar0, timeout: Delta) -> Result<bool> {
+        wait_on(timeout, || {
+            let val = regs::NV_PGC6_BSI_SECURE_SCRATCH_14::read(bar);
+            if val.boot_stage_3_handoff() {
+                Some(true)
+            } else {
+                None
+            }
+        })
+    }
 }
diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs
index d9212fa50197..c214f8056d6e 100644
--- a/drivers/gpu/nova-core/regs.rs
+++ b/drivers/gpu/nova-core/regs.rs
@@ -123,6 +123,12 @@ pub(crate) fn higher_bound(self) -> u64 {
 // These scratch registers remain powered on even in a low-power state and have a designated group
 // number.
 
+// Boot Sequence Interface (BSI) register used to determine
+// if GSP reload/resume has completed during the boot process.
+register!(NV_PGC6_BSI_SECURE_SCRATCH_14 @ 0x001180f8 {
+    26:26   boot_stage_3_handoff as bool;
+});
+
 // Privilege level mask register. It dictates whether the host CPU has privilege to access the
 // `PGC6_AON_SECURE_SCRATCH_GROUP_05` register (which it needs to read GFW_BOOT).
 register!(NV_PGC6_AON_SECURE_SCRATCH_GROUP_05_PRIV_LEVEL_MASK @ 0x00118128,
-- 
2.34.1