linux-kernel - [PATCH v3 09/14] gpu: nova-core: sequencer: Add delay opcode support

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Message-Id: <20251106231153.2925637-10-joelagnelf@nvidia.com>
Date: Thu,  6 Nov 2025 18:11:48 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	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
Subject: [PATCH v3 09/14] 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/sequencer.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/nova-core/gsp/sequencer.rs b/drivers/gpu/nova-core/gsp/sequencer.rs
index 32a0446b8c75..17118967a8d4 100644
--- a/drivers/gpu/nova-core/gsp/sequencer.rs
+++ b/drivers/gpu/nova-core/gsp/sequencer.rs
@@ -4,6 +4,7 @@
 
 use core::mem::size_of;
 use kernel::alloc::flags::GFP_KERNEL;
+use kernel::bindings;
 use kernel::device;
 use kernel::io::poll::read_poll_timeout;
 use kernel::prelude::*;
@@ -46,6 +47,7 @@ pub(crate) enum GspSeqCmd {
     RegWrite(fw::GSP_SEQ_BUF_PAYLOAD_REG_WRITE),
     RegModify(fw::GSP_SEQ_BUF_PAYLOAD_REG_MODIFY),
     RegPoll(fw::GSP_SEQ_BUF_PAYLOAD_REG_POLL),
+    DelayUs(fw::GSP_SEQ_BUF_PAYLOAD_DELAY_US),
     RegStore(fw::GSP_SEQ_BUF_PAYLOAD_REG_STORE),
 }
 
@@ -65,6 +67,10 @@ pub(crate) fn from_fw_cmd(cmd: &fw::GSP_SEQUENCER_BUFFER_CMD) -> Result<Self> {
                 // SAFETY: We're using the union field that corresponds to the opCode.
                 Ok(GspSeqCmd::RegPoll(unsafe { cmd.payload.regPoll }))
             }
+            fw::GSP_SEQ_BUF_OPCODE_GSP_SEQ_BUF_OPCODE_DELAY_US => {
+                // SAFETY: We're using the union field that corresponds to the opCode.
+                Ok(GspSeqCmd::DelayUs(unsafe { cmd.payload.delayUs }))
+            }
             fw::GSP_SEQ_BUF_OPCODE_GSP_SEQ_BUF_OPCODE_REG_STORE => {
                 // SAFETY: We're using the union field that corresponds to the opCode.
                 Ok(GspSeqCmd::RegStore(unsafe { cmd.payload.regStore }))
@@ -96,6 +102,7 @@ pub(crate) fn size_bytes(&self) -> usize {
                 opcode_size + size_of::<fw::GSP_SEQ_BUF_PAYLOAD_REG_MODIFY>()
             }
             GspSeqCmd::RegPoll(_) => opcode_size + size_of::<fw::GSP_SEQ_BUF_PAYLOAD_REG_POLL>(),
+            GspSeqCmd::DelayUs(_) => opcode_size + size_of::<fw::GSP_SEQ_BUF_PAYLOAD_DELAY_US>(),
             GspSeqCmd::RegStore(_) => opcode_size + size_of::<fw::GSP_SEQ_BUF_PAYLOAD_REG_STORE>(),
         }
     }
@@ -159,6 +166,21 @@ fn run(&self, sequencer: &GspSequencer<'_>) -> Result {
     }
 }
 
+impl GspSeqCmdRunner for fw::GSP_SEQ_BUF_PAYLOAD_DELAY_US {
+    fn run(&self, sequencer: &GspSequencer<'_>) -> Result {
+        dev_dbg!(sequencer.dev, "DelayUs: val=0x{:x}\n", self.val);
+        // SAFETY: `usleep_range_state` is safe to call with any parameter.
+        unsafe {
+            bindings::usleep_range_state(
+                self.val as usize,
+                self.val as usize,
+                bindings::TASK_UNINTERRUPTIBLE,
+            )
+        };
+        Ok(())
+    }
+}
+
 impl GspSeqCmdRunner for fw::GSP_SEQ_BUF_PAYLOAD_REG_STORE {
     fn run(&self, sequencer: &GspSequencer<'_>) -> Result {
         let addr = self.addr as usize;
@@ -176,6 +198,7 @@ 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