linux-kernel - [PATCH v3 01/14] gpu: nova-core: falcon: Move waiting until halted to a helper

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Message-Id: <20251106231153.2925637-2-joelagnelf@nvidia.com>
Date: Thu,  6 Nov 2025 18:11:40 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org,
	rust-for-linux@...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,
	Daniel Almeida <daniel.almeida@...labora.com>,
	nouveau@...ts.freedesktop.org,
	Lyude Paul <lyude@...hat.com>
Subject: [PATCH v3 01/14] gpu: nova-core: falcon: Move waiting until halted to a helper

Move the "waiting until halted" functionality into a helper so that we
can use it in the sequencer, which is a separate sequencer operation.

Reviewed-by: Lyude Paul <lyude@...hat.com>
Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
---
 drivers/gpu/nova-core/falcon.rs | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
index dc8c2179935e..dc883ce5f28b 100644
--- a/drivers/gpu/nova-core/falcon.rs
+++ b/drivers/gpu/nova-core/falcon.rs
@@ -540,6 +540,19 @@ pub(crate) fn dma_load<F: FalconFirmware<Target = E>>(&self, bar: &Bar0, fw: &F)
         Ok(())
     }
 
+    /// Wait until the falcon CPU is halted.
+    pub(crate) fn wait_till_halted(&self, bar: &Bar0) -> Result<()> {
+        // TIMEOUT: arbitrarily large value, firmwares should complete in less than 2 seconds.
+        read_poll_timeout(
+            || Ok(regs::NV_PFALCON_FALCON_CPUCTL::read(bar, &E::ID)),
+            |r| r.halted(),
+            Delta::ZERO,
+            Delta::from_secs(2),
+        )?;
+
+        Ok(())
+    }
+
     /// Runs the loaded firmware and waits for its completion.
     ///
     /// `mbox0` and `mbox1` are optional parameters to write into the `MBOX0` and `MBOX1` registers
@@ -574,13 +587,7 @@ pub(crate) fn boot(
                 .write(bar, &E::ID),
         }
 
-        // TIMEOUT: arbitrarily large value, firmwares should complete in less than 2 seconds.
-        read_poll_timeout(
-            || Ok(regs::NV_PFALCON_FALCON_CPUCTL::read(bar, &E::ID)),
-            |r| r.halted(),
-            Delta::ZERO,
-            Delta::from_secs(2),
-        )?;
+        self.wait_till_halted(bar)?;
 
         let (mbox0, mbox1) = (
             regs::NV_PFALCON_FALCON_MAILBOX0::read(bar, &E::ID).value(),
-- 
2.34.1