1 files changed, 21 insertions, 0 deletions

diff --git a/sys/dev/iommu/busdma_iommu.c b/sys/dev/iommu/busdma_iommu.c
index a9db66ecc387..8e266f9f3eb1 100644
--- a/sys/dev/iommu/busdma_iommu.c
+++ b/sys/dev/iommu/busdma_iommu.c
@@ -1064,6 +1064,26 @@ bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map1,
 	return (error);
 }
 
+static void
+iommu_domain_unload_task(void *arg, int pending)
+{
+	struct iommu_domain *domain;
+	struct iommu_map_entries_tailq entries;
+
+	domain = arg;
+	TAILQ_INIT(&entries);
+
+	for (;;) {
+		IOMMU_DOMAIN_LOCK(domain);
+		TAILQ_SWAP(&domain->unload_entries, &entries,
+		    iommu_map_entry, dmamap_link);
+		IOMMU_DOMAIN_UNLOCK(domain);
+		if (TAILQ_EMPTY(&entries))
+			break;
+		iommu_domain_unload(domain, &entries, true);
+	}
+}
+
 void
 iommu_domain_init(struct iommu_unit *unit, struct iommu_domain *domain,
     const struct iommu_domain_map_ops *ops)
@@ -1072,6 +1092,7 @@ iommu_domain_init(struct iommu_unit *unit, struct iommu_domain *domain,
 	domain->ops = ops;
 	domain->iommu = unit;
 
+	TASK_INIT(&domain->unload_task, 0, iommu_domain_unload_task, domain);
 	RB_INIT(&domain->rb_root);
 	TAILQ_INIT(&domain->unload_entries);
 	mtx_init(&domain->lock, "iodom", NULL, MTX_DEF);