[RFC 1/2] dma-mapping: Export arm_iommu_{alloc, free}_iova() functions
From: Hiroshi DOYU <hidden>
Date: 2012-05-18 06:10:59
Also in:
linux-iommu, linux-mm, linux-tegra, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Export __{alloc,free}_iova() as arm_iommu_{alloc,free}_iova().
There are some cases that IOVA allocation and mapping have to be done
seperately, especially for perf optimization reasons. This patch
allows client modules to {alloc,free} IOVA space by themselves without
backing up actual pages for that area.
Signed-off-by: Hiroshi DOYU <redacted>
---
arch/arm/include/asm/dma-iommu.h | 4 ++++
arch/arm/mm/dma-mapping.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h
index 799b094..2595928 100644
--- a/arch/arm/include/asm/dma-iommu.h
+++ b/arch/arm/include/asm/dma-iommu.h@@ -30,5 +30,9 @@ void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping); int arm_iommu_attach_device(struct device *dev, struct dma_iommu_mapping *mapping); +dma_addr_t arm_iommu_alloc_iova(struct device *dev, size_t size); + +void arm_iommu_free_iova(struct device *dev, dma_addr_t addr, size_t size); + #endif /* __KERNEL__ */ #endif
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index afb5e7a..bca1715 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c@@ -1041,6 +1041,21 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, return mapping->base + (start << (mapping->order + PAGE_SHIFT)); } +/** + * arm_iommu_alloc_iova + * @dev: valid struct device pointer + * @size: size of buffer to allocate + * + * Allocate IOVA address range + */ +dma_addr_t arm_iommu_alloc_iova(struct device *dev, size_t size) +{ + struct dma_iommu_mapping *mapping = dev->archdata.mapping; + + return __alloc_iova(mapping, size); +} +EXPORT_SYMBOL_GPL(arm_iommu_alloc_iova); + static inline void __free_iova(struct dma_iommu_mapping *mapping, dma_addr_t addr, size_t size) {
@@ -1055,6 +1070,22 @@ static inline void __free_iova(struct dma_iommu_mapping *mapping, spin_unlock_irqrestore(&mapping->lock, flags); } +/** + * arm_iommu_free_iova + * @dev: valid struct device pointer + * @iova: iova address being free'ed + * @size: size of buffer to allocate + * + * Free IOVA address range + */ +void arm_iommu_free_iova(struct device *dev, dma_addr_t addr, size_t size) +{ + struct dma_iommu_mapping *mapping = dev->archdata.mapping; + + __free_iova(mapping, addr, size); +} +EXPORT_SYMBOL_GPL(arm_iommu_free_iova); + static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, gfp_t gfp) { struct page **pages;
--
1.7.5.4