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diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -2534,6 +2534,7 @@
dev/nvme/nvme_sysctl.c optional nvme
dev/nvme/nvme_test.c optional nvme
dev/nvme/nvme_util.c optional nvme | scbus
+dev/nvme/nvmec_if.m optional nvme
dev/nvmem/nvmem.c optional nvmem fdt
dev/nvmem/nvmem_if.m optional nvmem
dev/nvmf/controller/ctl_frontend_nvmf.c optional nvmft
diff --git a/sys/dev/nvme/nvmec_if.m b/sys/dev/nvme/nvmec_if.m
new file mode 100644
--- /dev/null
+++ b/sys/dev/nvme/nvmec_if.m
@@ -0,0 +1,55 @@
+# Copyright (c) 2025 Netlix, Inc
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+
+# Interface from the NVME controller to its children to notify it of certain
+# interesting events.
+
+INTERFACE nvmec;
+
+HEADER {
+ #include "dev/nvme/nvme_private.h"
+};
+
+#
+# A new namespace is now available
+#
+METHOD int new_ns {
+ device_t dev; /* nvme device */
+ struct nvme_namespace *ns; /* information about the namespace */
+};
+
+#
+# A namespace has been removed
+#
+METHOD int rm_ns {
+ device_t dev; /* nvme device */
+ struct nvme_namespace *ns; /* information about the namespace */
+};
+
+#
+# A namespace has been changed somehow
+#
+METHOD int delta_ns {
+ device_t dev; /* nvme device */
+ struct nvme_namespace *ns; /* information about the namespace */
+};
+
+#
+# The controller has failed
+#
+METHOD int fail {
+ device_t dev; /* nvme device */
+};
+
+#
+# Async completion
+#
+METHOD int async {
+ device_t dev; /* nvme device */
+ const struct nvme_completion *cpl; /* Completion for this async event */
+ uint32_t pg_nr; /* Page number reported by async event */
+ void *page; /* Contents of the page */
+ uint32_t page_len; /* Length of the page */
+};

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