linux-kernel - [PATCH v5 09/13] gpu: nova-core: sequencer: Add delay opcode support

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Message-Id: <20251114195552.739371-10-joelagnelf@nvidia.com>
Date: Fri, 14 Nov 2025 14:55:48 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	Danilo Krummrich <dakr@...nel.org>,
	Alexandre Courbot <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>,
	Timur Tabi <ttabi@...dia.com>,
	joel@...lfernandes.org,
	Daniel Almeida <daniel.almeida@...labora.com>,
	nouveau@...ts.freedesktop.org,
	Joel Fernandes <joelagnelf@...dia.com>
Subject: [PATCH v5 09/13] gpu: nova-core: sequencer: Add delay opcode support

Implement a sequencer opcode for delay operations.

Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
---
 drivers/gpu/nova-core/gsp/fw.rs        |  2 --
 drivers/gpu/nova-core/gsp/sequencer.rs | 15 +++++++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/nova-core/gsp/fw.rs b/drivers/gpu/nova-core/gsp/fw.rs
index 376c10cc8003..0cce54310c35 100644
--- a/drivers/gpu/nova-core/gsp/fw.rs
+++ b/drivers/gpu/nova-core/gsp/fw.rs
@@ -473,7 +473,6 @@ unsafe impl AsBytes for RegPollPayload {}
 #[derive(Copy, Clone)]
 pub(crate) struct DelayUsPayload(r570_144::GSP_SEQ_BUF_PAYLOAD_DELAY_US);
 
-#[expect(unused)]
 impl DelayUsPayload {
     /// Returns the delay value in microseconds.
     pub(crate) fn val(&self) -> u32 {
@@ -514,7 +513,6 @@ unsafe impl AsBytes for RegStorePayload {}
 #[repr(transparent)]
 pub(crate) struct SequencerBufferCmd(r570_144::GSP_SEQUENCER_BUFFER_CMD);
 
-#[expect(unused)]
 impl SequencerBufferCmd {
     /// Returns the opcode as a `SeqBufOpcode` enum, or error if invalid.
     pub(crate) fn opcode(&self) -> Result<SeqBufOpcode> {
diff --git a/drivers/gpu/nova-core/gsp/sequencer.rs b/drivers/gpu/nova-core/gsp/sequencer.rs
index b564523b64e7..19bde9b8bf1d 100644
--- a/drivers/gpu/nova-core/gsp/sequencer.rs
+++ b/drivers/gpu/nova-core/gsp/sequencer.rs
@@ -12,6 +12,7 @@
 use kernel::device;
 use kernel::io::poll::read_poll_timeout;
 use kernel::prelude::*;
+use kernel::time::delay::fsleep;
 use kernel::time::Delta;
 use kernel::transmute::FromBytes;
 use kernel::types::ARef;
@@ -65,6 +66,7 @@ pub(crate) enum GspSeqCmd {
     RegWrite(fw::RegWritePayload),
     RegModify(fw::RegModifyPayload),
     RegPoll(fw::RegPollPayload),
+    DelayUs(fw::DelayUsPayload),
     RegStore(fw::RegStorePayload),
 }
 
@@ -90,6 +92,11 @@ pub(crate) fn new(data: &[u8], dev: &device::Device) -> Result<(Self, usize)> {
                 let size = opcode_size + size_of_val(&payload);
                 (GspSeqCmd::RegPoll(payload), size)
             }
+            fw::SeqBufOpcode::DelayUs => {
+                let payload = fw_cmd.delay_us_payload()?;
+                let size = opcode_size + size_of_val(&payload);
+                (GspSeqCmd::DelayUs(payload), size)
+            }
             fw::SeqBufOpcode::RegStore => {
                 let payload = fw_cmd.reg_store_payload()?;
                 let size = opcode_size + size_of_val(&payload);
@@ -177,6 +184,13 @@ fn run(&self, sequencer: &GspSequencer<'_>) -> Result {
     }
 }
 
+impl GspSeqCmdRunner for fw::DelayUsPayload {
+    fn run(&self, _sequencer: &GspSequencer<'_>) -> Result {
+        fsleep(Delta::from_micros(i64::from(self.val())));
+        Ok(())
+    }
+}
+
 impl GspSeqCmdRunner for fw::RegStorePayload {
     fn run(&self, sequencer: &GspSequencer<'_>) -> Result {
         let addr = self.addr() as usize;
@@ -194,6 +208,7 @@ fn run(&self, seq: &GspSequencer<'_>) -> Result {
             GspSeqCmd::RegWrite(cmd) => cmd.run(seq),
             GspSeqCmd::RegModify(cmd) => cmd.run(seq),
             GspSeqCmd::RegPoll(cmd) => cmd.run(seq),
+            GspSeqCmd::DelayUs(cmd) => cmd.run(seq),
             GspSeqCmd::RegStore(cmd) => cmd.run(seq),
         }
     }
-- 
2.34.1