drm/xe/display: Clarify XE_IOCTL_DBG message

This should make it easier to understand from userspace why importing BO
fails.

Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250117115305.53113-1-dev@lankhorst.se
Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>

Author: Maarten Lankhorst

drivers/gpu/drm/xe/display/intel_fb_bo.c

@@ -50,10 +50,10 @@ int intel_fb_bo_framebuffer_init(struct intel_framebuffer *intel_fb,
 		/*
 		 * XE_BO_FLAG_SCANOUT should ideally be set at creation, or is
 		 * automatically set when creating FB. We cannot change caching
-		 * mode when the boect is VM_BINDed, so we can only set
+		 * mode when the bo is VM_BINDed, so we can only set
 		 * coherency with display when unbound.
 		 */
-		if (XE_IOCTL_DBG(xe, !list_empty(&bo->ttm.base.gpuva.list))) {
+		if (XE_IOCTL_DBG(xe, xe_bo_is_vm_bound(bo))) {
 			ttm_bo_unreserve(&bo->ttm);
 			ret = -EINVAL;
 			goto err;

drivers/gpu/drm/xe/xe_bo.c

@@ -128,6 +128,22 @@ bool xe_bo_is_stolen_devmem(struct xe_bo *bo)
 		GRAPHICS_VERx100(xe_bo_device(bo)) >= 1270;
 }
 
+/**
+ * xe_bo_is_vm_bound - check if BO has any mappings through VM_BIND
+ * @bo: The BO
+ *
+ * Check if a given bo is bound through VM_BIND. This requires the
+ * reservation lock for the BO to be held.
+ *
+ * Returns: boolean
+ */
+bool xe_bo_is_vm_bound(struct xe_bo *bo)
+{
+	xe_bo_assert_held(bo);
+
+	return !list_empty(&bo->ttm.base.gpuva.list);
+}
+
 static bool xe_bo_is_user(struct xe_bo *bo)
 {
 	return bo->flags & XE_BO_FLAG_USER;

drivers/gpu/drm/xe/xe_bo.h

@@ -241,6 +241,7 @@ bool mem_type_is_vram(u32 mem_type);
 bool xe_bo_is_vram(struct xe_bo *bo);
 bool xe_bo_is_stolen(struct xe_bo *bo);
 bool xe_bo_is_stolen_devmem(struct xe_bo *bo);
+bool xe_bo_is_vm_bound(struct xe_bo *bo);
 bool xe_bo_has_single_placement(struct xe_bo *bo);
 uint64_t vram_region_gpu_offset(struct ttm_resource *res);