[RFC 3/5] ARM: dma-mapping: New dma_map_ops->iova_alloc*_at* function

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To allocate IOVA area at specified address

Signed-off-by: Hiroshi Doyu <hdoyu@xxxxxxxxxx>
 arch/arm/include/asm/dma-mapping.h |    9 +++++++++
 arch/arm/mm/dma-mapping.c          |   35 +++++++++++++++++++++++++++++++++++
 include/linux/dma-mapping.h        |    2 ++
 3 files changed, 46 insertions(+), 0 deletions(-)

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 5b86600..f04a533 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -187,6 +187,15 @@ static inline void dma_iova_free(struct device *dev, dma_addr_t addr,
 	ops->iova_free(dev, addr, size);
+static inline dma_addr_t dma_iova_alloc_at(struct device *dev, dma_addr_t addr,
+					   size_t size)
+	struct dma_map_ops *ops = get_dma_ops(dev);
+	BUG_ON(!ops);
+	return ops->iova_alloc_at(dev, addr, size);
 static inline size_t dma_iova_get_free_total(struct device *dev)
 	struct dma_map_ops *ops = get_dma_ops(dev);
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index c18522a..8ca2d1a 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1080,6 +1080,40 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,
 	return mapping->base + (start << (mapping->order + PAGE_SHIFT));
+static dma_addr_t __alloc_iova_at(struct dma_iommu_mapping *mapping,
+				  dma_addr_t iova, size_t size)
+	unsigned int count, start, orig;
+	unsigned long flags;
+	count = ((PAGE_ALIGN(size) >> PAGE_SHIFT) +
+		 (1 << mapping->order) - 1) >> mapping->order;
+	spin_lock_irqsave(&mapping->lock, flags);
+	orig = (iova - mapping->base) >> (mapping->order + PAGE_SHIFT);
+	start = bitmap_find_next_zero_area(mapping->bitmap, mapping->bits,
+					   orig, count, 0);
+	if ((start > mapping->bits) || (orig != start)) {
+		spin_unlock_irqrestore(&mapping->lock, flags);
+		return DMA_ERROR_CODE;
+	}
+	bitmap_set(mapping->bitmap, start, count);
+	spin_unlock_irqrestore(&mapping->lock, flags);
+	return mapping->base + (start << (mapping->order + PAGE_SHIFT));
+static dma_addr_t arm_iommu_iova_alloc_at(struct device *dev, dma_addr_t iova,
+				size_t size)
+	struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+	return __alloc_iova_at(mapping, iova, size);
 static dma_addr_t arm_iommu_iova_alloc(struct device *dev, size_t size)
 	struct dma_iommu_mapping *mapping = dev->archdata.mapping;
@@ -1789,6 +1823,7 @@ struct dma_map_ops iommu_ops = {
 	.sync_sg_for_device	= arm_iommu_sync_sg_for_device,
 	.iova_alloc		= arm_iommu_iova_alloc,
+	.iova_alloc_at		= arm_iommu_iova_alloc_at,
 	.iova_free		= arm_iommu_iova_free,
 	.iova_get_free_total	= arm_iommu_iova_get_free_total,
 	.iova_get_free_max	= arm_iommu_iova_get_free_max,
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index e85aa04..4cf4427 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -54,6 +54,8 @@ struct dma_map_ops {
 	u64 (*get_required_mask)(struct device *dev);
 	dma_addr_t (*iova_alloc)(struct device *dev, size_t size);
+	dma_addr_t (*iova_alloc_at)(struct device *dev, dma_addr_t dma_addr,
+				    size_t size);
 	void (*iova_free)(struct device *dev, dma_addr_t addr, size_t size);
 	size_t (*iova_get_free_total)(struct device *dev);
 	size_t (*iova_get_free_max)(struct device *dev);

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