gpu: nova-core: gsp: make `Cmdq` a pinned type

Make `Cmdq` a pinned type. This is needed to use Mutex, which is needed
to add locking to `Cmdq`.

Reviewed-by: Zhi Wang <zhiw@nvidia.com>
Tested-by: Zhi Wang <zhiw@nvidia.com>
Signed-off-by: Eliot Courtney <ecourtney@nvidia.com>
Link: https://patch.msgid.link/20260318-cmdq-locking-v5-4-18b37e3f9069@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

2 files changed, 7 insertions, 7 deletions

diff --git a/drivers/gpu/nova-core/gsp.rs b/drivers/gpu/nova-core/gsp.rs
index c69adaa92bbe..72f173726f87 100644
--- a/drivers/gpu/nova-core/gsp.rs
+++ b/drivers/gpu/nova-core/gsp.rs
@@ -114,6 +114,7 @@ pub(crate) struct Gsp {
     /// RM log buffer.
     logrm: LogBuffer,
     /// Command queue.
+    #[pin]
     pub(crate) cmdq: Cmdq,
     /// RM arguments.
     rmargs: CoherentAllocation<GspArgumentsPadded>,
@@ -134,7 +135,7 @@ impl Gsp {
                 loginit: LogBuffer::new(dev)?,
                 logintr: LogBuffer::new(dev)?,
                 logrm: LogBuffer::new(dev)?,
-                cmdq: Cmdq::new(dev)?,
+                cmdq <- Cmdq::new(dev),
                 rmargs: CoherentAllocation::<GspArgumentsPadded>::alloc_coherent(
                     dev,
                     1,
@@ -151,7 +152,7 @@ impl Gsp {
                         libos, [1]?, LibosMemoryRegionInitArgument::new("LOGINTR", &logintr.0)
                     );
                     dma_write!(libos, [2]?, LibosMemoryRegionInitArgument::new("LOGRM", &logrm.0));
-                    dma_write!(rmargs, [0]?.inner, fw::GspArgumentsCached::new(cmdq));
+                    dma_write!(rmargs, [0]?.inner, fw::GspArgumentsCached::new(&cmdq));
                     dma_write!(libos, [3]?, LibosMemoryRegionInitArgument::new("RMARGS", rmargs));
                 },
             }))
diff --git a/drivers/gpu/nova-core/gsp/cmdq.rs b/drivers/gpu/nova-core/gsp/cmdq.rs
index 4fc14689d38e..86ff9a3d1732 100644
--- a/drivers/gpu/nova-core/gsp/cmdq.rs
+++ b/drivers/gpu/nova-core/gsp/cmdq.rs
@@ -446,6 +446,7 @@ struct GspMessage<'a> {
 ///
 /// Provides the ability to send commands and receive messages from the GSP using a shared memory
 /// area.
+#[pin_data]
 pub(crate) struct Cmdq {
     /// Device this command queue belongs to.
     dev: ARef<device::Device>,
@@ -479,13 +480,11 @@ impl Cmdq {
     pub(super) const RECEIVE_TIMEOUT: Delta = Delta::from_secs(5);
 
     /// Creates a new command queue for `dev`.
-    pub(crate) fn new(dev: &device::Device<device::Bound>) -> Result<Cmdq> {
-        let gsp_mem = DmaGspMem::new(dev)?;
-
-        Ok(Cmdq {
+    pub(crate) fn new(dev: &device::Device<device::Bound>) -> impl PinInit<Self, Error> + '_ {
+        try_pin_init!(Self {
+            gsp_mem: DmaGspMem::new(dev)?,
             dev: dev.into(),
             seq: 0,
-            gsp_mem,
         })
     }