drm/xe: Only set VM->asid for platforms that support a ASID

This will help with TLB invalidation as the ASID in TLB invalidate
should be zero for platforms that do not support a ASID.
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>

drivers/gpu/drm/xe/xe_vm.c

@@ -1429,11 +1429,13 @@ static void vm_destroy_work_func(struct work_struct *w)
 		xe_device_mem_access_put(xe);
 		xe_pm_runtime_put(xe);
 
+		if (xe->info.supports_usm) {
 			mutex_lock(&xe->usm.lock);
 			lookup = xa_erase(&xe->usm.asid_to_vm, vm->usm.asid);
 			XE_WARN_ON(lookup != vm);
 			mutex_unlock(&xe->usm.lock);
 		}
+	}
 
 	/*
 	 * XXX: We delay destroying the PT root until the VM if freed as PT root
@@ -1917,6 +1919,7 @@ int xe_vm_create_ioctl(struct drm_device *dev, void *data,
 		return err;
 	}
 
+	if (xe->info.supports_usm) {
 		mutex_lock(&xe->usm.lock);
 		err = xa_alloc_cyclic(&xe->usm.asid_to_vm, &asid, vm,
 				      XA_LIMIT(0, XE_MAX_ASID - 1),
@@ -1927,6 +1930,7 @@ int xe_vm_create_ioctl(struct drm_device *dev, void *data,
 			return err;
 		}
 		vm->usm.asid = asid;
+	}
 
 	args->vm_id = id;