Introduce a new function whose role is to unmap all allocated
reserved IOVAs and free the reserved iova domain
Signed-off-by: Eric Auger <eric.au...@linaro.org>
---
v3 -> v4:
- previously "iommu/arm-smmu: relinquish reserved resources on
domain deletion"
---
drivers/iommu/dma-reserved-iommu.c | 27 ++++++++++++++++++++++++---
include/linux/dma-reserved-iommu.h | 7 +++++++
2 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/dma-reserved-iommu.c
b/drivers/iommu/dma-reserved-iommu.c
index 537c83e..7217bb7 100644
--- a/drivers/iommu/dma-reserved-iommu.c
+++ b/drivers/iommu/dma-reserved-iommu.c
@@ -116,7 +116,7 @@ unlock:
}
EXPORT_SYMBOL_GPL(iommu_alloc_reserved_iova_domain);
-void iommu_free_reserved_iova_domain(struct iommu_domain *domain)
+void __iommu_free_reserved_iova_domain(struct iommu_domain *domain)
{
struct iova_domain *iovad =
(struct iova_domain *)domain->reserved_iova_cookie;
@@ -124,11 +124,14 @@ void iommu_free_reserved_iova_domain(struct iommu_domain
*domain)
if (!iovad)
return;
- mutex_lock(&domain->reserved_mutex);
-
put_iova_domain(iovad);
kfree(iovad);
+}
+void iommu_free_reserved_iova_domain(struct iommu_domain *domain)
+{
+ mutex_lock(&domain->reserved_mutex);
+ __iommu_free_reserved_iova_domain(domain);
mutex_unlock(&domain->reserved_mutex);
}
EXPORT_SYMBOL_GPL(iommu_free_reserved_iova_domain);
@@ -245,5 +248,23 @@ unlock:
}
EXPORT_SYMBOL_GPL(iommu_put_single_reserved);
+void iommu_unmap_reserved(struct iommu_domain *domain)
+{
+ struct rb_node *node;
+
+ mutex_lock(&domain->reserved_mutex);
+ while ((node = rb_first(&domain->reserved_binding_list))) {
+ struct iommu_reserved_binding *b =
+ rb_entry(node, struct iommu_reserved_binding, node);
+
+ while (!kref_put(&b->kref, reserved_binding_release))
+ ;
+ }
+ domain->reserved_binding_list = RB_ROOT;
+ __iommu_free_reserved_iova_domain(domain);
+ mutex_unlock(&domain->reserved_mutex);
+}
+EXPORT_SYMBOL_GPL(iommu_unmap_reserved);
+
diff --git a/include/linux/dma-reserved-iommu.h
b/include/linux/dma-reserved-iommu.h
index 71ec800..766c58c 100644
--- a/include/linux/dma-reserved-iommu.h
+++ b/include/linux/dma-reserved-iommu.h
@@ -66,6 +66,13 @@ int iommu_get_single_reserved(struct iommu_domain *domain,
*/
void iommu_put_single_reserved(struct iommu_domain *domain, dma_addr_t iova);
+/**
+ * iommu_unmap_reserved: unmap & destroy the reserved iova bindings
+ *
+ * @domain: iommu domain handle
+ */
+void iommu_unmap_reserved(struct iommu_domain *domain);
+
#endif /* CONFIG_IOMMU_DMA_RESERVED */
#endif /* __KERNEL__ */
#endif /* __DMA_RESERVED_IOMMU_H */
--
1.9.1
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