diff --git a/sys/x86/x86/busdma_machdep.c b/sys/x86/x86/busdma_machdep.c
index c96b26d579f..aa9e36d3e97 100644
--- a/sys/x86/x86/busdma_machdep.c
+++ b/sys/x86/x86/busdma_machdep.c
@@ -197,6 +197,8 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
 	struct bus_dma_tag_common *tc;
 	int error;
 
+	WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "%s", __func__);
+
 	if (parent == NULL) {
 		error = bus_dma_bounce_impl.tag_create(parent, alignment,
 		    boundary, lowaddr, highaddr, filter, filterarg, maxsize,
@@ -228,6 +230,8 @@ bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
 {
 	struct bus_dma_tag_common *tc;
 
+	WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "%s", __func__);
+
 	tc = (struct bus_dma_tag_common *)dmat;
 	return (tc->impl->map_create(dmat, flags, mapp));
 }
@@ -257,6 +261,8 @@ bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
 {
 	struct bus_dma_tag_common *tc;
 
+	WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "%s", __func__);
+
 	tc = (struct bus_dma_tag_common *)dmat;
 	return (tc->impl->mem_alloc(dmat, vaddr, flags, mapp));
 }