->iova>_get_free_total() returns the sum of available free areas. ->iova>_get_free_max() returns the largest available free area size.
Signed-off-by: Hiroshi Doyu hdoyu@nvidia.com --- arch/arm/include/asm/dma-mapping.h | 16 ++++++++++ arch/arm/mm/dma-mapping.c | 54 ++++++++++++++++++++++++++++++++++++ include/linux/dma-mapping.h | 3 ++ 3 files changed, 73 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 2300484..1cbd279 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -170,6 +170,22 @@ static inline void dma_free_attrs(struct device *dev, size_t size, ops->free(dev, size, cpu_addr, dma_handle, attrs); }
+static inline size_t dma_iova_get_free_total(struct device *dev) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + BUG_ON(!ops); + + return ops->iova_get_free_total(dev); +} + +static inline size_t dma_iova_get_free_max(struct device *dev) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + BUG_ON(!ops); + + return ops->iova_get_free_max(dev); +} + /** * arm_dma_mmap - map a coherent DMA allocation into user space * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index e4746b7..db17338 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -1001,6 +1001,57 @@ fs_initcall(dma_debug_do_init);
/* IOMMU */
+static size_t arm_iommu_iova_get_free_total(struct device *dev) +{ + struct dma_iommu_mapping *mapping = dev->archdata.mapping; + unsigned long flags; + size_t size = 0; + unsigned long start = 0; + + BUG_ON(!dev); + BUG_ON(!mapping); + + spin_lock_irqsave(&mapping->lock, flags); + while (1) { + unsigned long end; + + start = bitmap_find_next_zero_area(mapping->bitmap, + mapping->bits, start, 1, 0); + if (start > mapping->bits) + break; + + end = find_next_bit(mapping->bitmap, mapping->bits, start); + size += end - start; + start = end; + } + spin_unlock_irqrestore(&mapping->lock, flags); + return size << (mapping->order + PAGE_SHIFT); +} + +static size_t arm_iommu_iova_get_free_max(struct device *dev) +{ + struct dma_iommu_mapping *mapping = dev->archdata.mapping; + unsigned long flags; + size_t max_free = 0; + unsigned long start = 0; + + spin_lock_irqsave(&mapping->lock, flags); + while (1) { + unsigned long end; + + start = bitmap_find_next_zero_area(mapping->bitmap, + mapping->bits, start, 1, 0); + if (start > mapping->bits) + break; + + end = find_next_bit(mapping->bitmap, mapping->bits, start); + max_free = max_t(size_t, max_free, end - start); + start = end; + } + spin_unlock_irqrestore(&mapping->lock, flags); + return max_free << (mapping->order + PAGE_SHIFT); +} + static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, size_t size) { @@ -1721,6 +1772,9 @@ struct dma_map_ops iommu_ops = { .unmap_sg = arm_iommu_unmap_sg, .sync_sg_for_cpu = arm_iommu_sync_sg_for_cpu, .sync_sg_for_device = arm_iommu_sync_sg_for_device, + + .iova_get_free_total = arm_iommu_iova_get_free_total, + .iova_get_free_max = arm_iommu_iova_get_free_max, };
struct dma_map_ops iommu_coherent_ops = { diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 94af418..0337182 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -53,6 +53,9 @@ struct dma_map_ops { #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK u64 (*get_required_mask)(struct device *dev); #endif + size_t (*iova_get_free_total)(struct device *dev); + size_t (*iova_get_free_max)(struct device *dev); + int is_phys; };