[PATCH 2/6] gpu: nova-core: gsp: sequencer: do not store sequence into GspSequencer

[Alexandre Courbot <acourbot@nvidia.com>]

The sequence is currently stored in the `GspSequencer` even though its
lifetime is limited to `GspSequencer::run`. This object-oriented design
does not play well with the borrow-checker, as `GspSequencer::iter`
borrows a reference to the `GspSequencer`, which makes it difficult to
introduce mutable references in `GspBootContext`, as we want to do in
order to make the `Falcon` references mutable.

Thus, store the sequence locally in `GspSequencer::run`, and move
iterator creation to `GspSeqIter::new` so it no longer needs to borrow
the whole `GspSequencer`.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
 drivers/gpu/nova-core/gsp/sequencer.rs | 35 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/nova-core/gsp/sequencer.rs b/drivers/gpu/nova-core/gsp/sequencer.rs
index 0da3c3531886..b5e049f76c28 100644
--- a/drivers/gpu/nova-core/gsp/sequencer.rs
+++ b/drivers/gpu/nova-core/gsp/sequencer.rs
@@ -129,8 +129,6 @@ pub(crate) fn new(data: &[u8], dev: &device::Device) -> Result<(Self, usize)> {
 
 /// GSP Sequencer for executing firmware commands during boot.
 pub(crate) struct GspSequencer<'a> {
-    /// Sequencer information with command data.
-    seq_info: GspSequence,
     /// `Bar0` for register access.
     bar: Bar0<'a>,
     /// SEC2 falcon for core operations.
@@ -271,7 +269,7 @@ fn run(&self, seq: &GspSequencer<'_>) -> Result {
 }
 
 /// Iterator over GSP sequencer commands.
-pub(crate) struct GspSeqIter<'a> {
+struct GspSeqIter<'a> {
     /// Command data buffer.
     cmd_data: &'a [u8],
     /// Current position in the buffer.
@@ -284,6 +282,18 @@ pub(crate) struct GspSeqIter<'a> {
     dev: &'a device::Device,
 }
 
+impl<'a> GspSeqIter<'a> {
+    fn new(seq: &'a GspSequence, dev: &'a device::Device) -> Self {
+        Self {
+            cmd_data: &seq.cmd_data,
+            current_offset: 0,
+            total_cmds: seq.cmd_index,
+            cmds_processed: 0,
+            dev,
+        }
+    }
+}
+
 impl<'a> Iterator for GspSeqIter<'a> {
     type Item = Result<GspSeqCmd>;
 
@@ -325,20 +335,6 @@ fn next(&mut self) -> Option<Self::Item> {
     }
 }
 
-impl<'a> GspSequencer<'a> {
-    fn iter(&self) -> GspSeqIter<'_> {
-        let cmd_data = &self.seq_info.cmd_data[..];
-
-        GspSeqIter {
-            cmd_data,
-            current_offset: 0,
-            total_cmds: self.seq_info.cmd_index,
-            cmds_processed: 0,
-            dev: self.dev,
-        }
-    }
-}
-
 impl<'a> GspSequencer<'a> {
     pub(crate) fn run(
         cmdq: &Cmdq,
@@ -355,7 +351,6 @@ pub(crate) fn run(
         };
 
         let sequencer = GspSequencer {
-            seq_info,
             bar: ctx.bar,
             sec2_falcon: ctx.sec2_falcon,
             gsp_falcon: ctx.gsp_falcon,
@@ -366,14 +361,14 @@ pub(crate) fn run(
 
         dev_dbg!(sequencer.dev, "Running CPU Sequencer commands\n");
 
-        for cmd_result in sequencer.iter() {
+        for cmd_result in GspSeqIter::new(&seq_info, sequencer.dev) {
             match cmd_result {
                 Ok(cmd) => cmd.run(&sequencer)?,
                 Err(e) => {
                     dev_err!(
                         sequencer.dev,
                         "Error running command at index {}\n",
-                        sequencer.seq_info.cmd_index
+                        seq_info.cmd_index
                     );
                     return Err(e);
                 }

-- 
2.54.0