drm/xe: Add debug messages for MMU notifier and VMA invalidate

Extra debug is useful when working on VM issues.
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240320194232.1910688-1-matthew.brost@intel.com

drivers/gpu/drm/xe/xe_vm.c

@@ -648,6 +648,10 @@ static bool vma_userptr_invalidate(struct mmu_interval_notifier *mni,
 	if (!mmu_notifier_range_blockable(range))
 		return false;
 
+	vm_dbg(&xe_vma_vm(vma)->xe->drm,
+	       "NOTIFIER: addr=0x%016llx, range=0x%016llx",
+		xe_vma_start(vma), xe_vma_size(vma));
+
 	down_write(&vm->userptr.notifier_lock);
 	mmu_interval_set_seq(mni, cur_seq);
 
@@ -3233,6 +3237,10 @@ int xe_vm_invalidate_vma(struct xe_vma *vma)
 	xe_assert(xe, !xe_vma_is_null(vma));
 	trace_xe_vma_invalidate(vma);
 
+	vm_dbg(&xe_vma_vm(vma)->xe->drm,
+	       "INVALIDATE: addr=0x%016llx, range=0x%016llx",
+		xe_vma_start(vma), xe_vma_size(vma));
+
 	/* Check that we don't race with page-table updates */
 	if (IS_ENABLED(CONFIG_PROVE_LOCKING)) {
 		if (xe_vma_is_userptr(vma)) {