Merge tag 'drm-rust-next-2025-11-18' of https://gitlab.freedesktop.org/drm/rust/kernel into drm-next

Cross-subsystem Changes:

Rust
  - Make slice::as_flattened usable on all supported versions of rustc.
  - Add FromBytes::from_bytes_prefix() method.

Core Changes:

  - Update Tyr in MAINTAINERS file.
  - Remove redundant device ptr from Rust GEM object.
  - Change how AlwaysRefCounted is implemented for GEM objects.
  - Add deferred vm_bo cleanup to GPUVM and use it in Panthor.

Driver Changes:

Nova Core
  - Introduction of bitfield! macro, with support for different storage sizes
    and custom visibility.
  - Introduction of safe converters between integer types for which the
    conversion is lossless.
  - GSP initialized up to fully booted state on Ampere.
  - Use more future-proof register for GPU identification.
  - Various simplifications and optimizations.

Nova
  - Select NOVA_CORE.
  - Depend on CONFIG_64BIT.

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/aRxtJC0D1pQUepF4@google.com

1 files changed, 16 insertions, 0 deletions

diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
index 476990e761f8..fdfc575b2603 100644
--- a/include/drm/drm_gpuvm.h
+++ b/include/drm/drm_gpuvm.h
@@ -27,6 +27,7 @@
 
 #include <linux/dma-resv.h>
 #include <linux/list.h>
+#include <linux/llist.h>
 #include <linux/rbtree.h>
 #include <linux/types.h>
 
@@ -152,6 +153,7 @@ void drm_gpuva_remove(struct drm_gpuva *va);
 
 void drm_gpuva_link(struct drm_gpuva *va, struct drm_gpuvm_bo *vm_bo);
 void drm_gpuva_unlink(struct drm_gpuva *va);
+void drm_gpuva_unlink_defer(struct drm_gpuva *va);
 
 struct drm_gpuva *drm_gpuva_find(struct drm_gpuvm *gpuvm,
 				 u64 addr, u64 range);
@@ -331,6 +333,11 @@ struct drm_gpuvm {
 		 */
 		spinlock_t lock;
 	} evict;
+
+	/**
+	 * @bo_defer: structure holding vm_bos that need to be destroyed
+	 */
+	struct llist_head bo_defer;
 };
 
 void drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name,
@@ -714,6 +721,12 @@ struct drm_gpuvm_bo {
 			 * &drm_gpuvms evict list.
 			 */
 			struct list_head evict;
+
+			/**
+			 * @list.entry.bo_defer: List entry to attach to
+			 * the &drm_gpuvms bo_defer list.
+			 */
+			struct llist_node bo_defer;
 		} entry;
 	} list;
 };
@@ -746,6 +759,9 @@ drm_gpuvm_bo_get(struct drm_gpuvm_bo *vm_bo)
 
 bool drm_gpuvm_bo_put(struct drm_gpuvm_bo *vm_bo);
 
+bool drm_gpuvm_bo_put_deferred(struct drm_gpuvm_bo *vm_bo);
+void drm_gpuvm_bo_deferred_cleanup(struct drm_gpuvm *gpuvm);
+
 struct drm_gpuvm_bo *
 drm_gpuvm_bo_find(struct drm_gpuvm *gpuvm,
 		  struct drm_gem_object *obj);