drm/xe: Allow freeing of a managed bo

If a bo is created via xe_managed_bo_create_pin_map() then it cannot be
freed by the driver using xe_bo_unpin_map_no_vm(), or indeed any other
existing function. The DRM layer will still have a pointer stashed
away for later freeing, causing a invalid memory access on driver
unload. So add a helper for releasing the DRM action as well.

v2: Drop 'xe' parameter (review feedbak from Michal W)

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://lore.kernel.org/r/20250910210237.603576-4-John.C.Harrison@Intel.com

Author: johnharr-intel

drivers/gpu/drm/xe/xe_bo.c

@@ -2629,6 +2629,11 @@ struct xe_bo *xe_managed_bo_create_pin_map(struct xe_device *xe, struct xe_tile
 	return bo;
 }
 
+void xe_managed_bo_unpin_map_no_vm(struct xe_bo *bo)
+{
+	devm_release_action(xe_bo_device(bo)->drm.dev, __xe_bo_unpin_map_no_vm, bo);
+}
+
 struct xe_bo *xe_managed_bo_create_from_data(struct xe_device *xe, struct xe_tile *tile,
 					     const void *data, size_t size, u32 flags)
 {

drivers/gpu/drm/xe/xe_bo.h

@@ -116,6 +116,7 @@ xe_bo_create_pin_map_at_novm(struct xe_device *xe, struct xe_tile *tile,
 			     u32 flags, u64 alignment, bool intr);
 struct xe_bo *xe_managed_bo_create_pin_map(struct xe_device *xe, struct xe_tile *tile,
 					   size_t size, u32 flags);
+void xe_managed_bo_unpin_map_no_vm(struct xe_bo *bo);
 struct xe_bo *xe_managed_bo_create_from_data(struct xe_device *xe, struct xe_tile *tile,
 					     const void *data, size_t size, u32 flags);
 int xe_managed_bo_reinit_in_vram(struct xe_device *xe, struct xe_tile *tile, struct xe_bo **src);