Messages in this thread Patch in this message | | | From | Eric Auger <> | Subject | [RFC v5 07/17] dma-reserved-iommu: iommu_unmap_reserved | Date | Tue, 1 Mar 2016 18:27:47 +0000 |
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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.auger@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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