[RFC v4 06/14] dma-reserved-iommu: iommu_unmap_reserved
From: Eric Auger <hidden>
Date: 2016-02-26 17:39:48
Also in:
kvm, kvmarm, linux-iommu, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
Introduce a new function whose role is to unmap all allocated reserved IOVAs and free the reserved iova domain Signed-off-by: Eric Auger <redacted> --- 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