gpu: nova-core: gsp: Create rmargs

Initialise the GSP resource manager arguments (rmargs) which provides
initialisation parameters to the GSP firmware during boot. The rmargs
structure contains arguments to configure the GSP message/command queue
location.

These are mapped for coherent DMA and added to the libos data structure
for access when booting GSP.

Signed-off-by: Alistair Popple <apopple@nvidia.com>
Co-developed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Message-ID: <20251110-gsp_boot-v9-10-8ae4058e3c0e@nvidia.com>

1 files changed, 16 insertions, 2 deletions

diff --git a/drivers/gpu/nova-core/gsp.rs b/drivers/gpu/nova-core/gsp.rs
index f9819a04bb40..609f8e5f2dcc 100644
--- a/drivers/gpu/nova-core/gsp.rs
+++ b/drivers/gpu/nova-core/gsp.rs
@@ -24,8 +24,11 @@ pub(crate) use fw::{
 
 use crate::{
     gsp::cmdq::Cmdq,
-    gsp::fw::LibosMemoryRegionInitArgument,
-    num, //
+    gsp::fw::{
+        GspArgumentsCached,
+        LibosMemoryRegionInitArgument, //
+    },
+    num,
 };
 
 pub(crate) const GSP_PAGE_SHIFT: usize = 12;
@@ -108,6 +111,8 @@ pub(crate) struct Gsp {
     logrm: LogBuffer,
     /// Command queue.
     pub(crate) cmdq: Cmdq,
+    /// RM arguments.
+    rmargs: CoherentAllocation<GspArgumentsCached>,
 }
 
 impl Gsp {
@@ -134,11 +139,20 @@ impl Gsp {
 
         let cmdq = Cmdq::new(dev)?;
 
+        let rmargs = CoherentAllocation::<GspArgumentsCached>::alloc_coherent(
+            dev,
+            1,
+            GFP_KERNEL | __GFP_ZERO,
+        )?;
+        dma_write!(rmargs[0] = fw::GspArgumentsCached::new(&cmdq))?;
+        dma_write!(libos[3] = LibosMemoryRegionInitArgument::new("RMARGS", &rmargs))?;
+
         Ok(try_pin_init!(Self {
             libos,
             loginit,
             logintr,
             logrm,
+            rmargs,
             cmdq,
         }))
     }