From 006f841db1e0da8801aedc6751b563b28f9a6319 Mon Sep 17 00:00:00 2001 From: Ritesh Harjani Date: Tue, 20 May 2014 10:02:59 +0530 Subject: arm: dma-iommu: Clean up redundant variable mapping->size can be derived from mapping->bits << PAGE_SHIFT which makes mapping->size as redundant. Clean this up. Signed-off-by: Ritesh Harjani Reported-by: Will Deacon Signed-off-by: Marek Szyprowski --- arch/arm/include/asm/dma-iommu.h | 1 - arch/arm/mm/dma-mapping.c | 11 ++++++----- 2 files changed, 6 insertions(+), 6 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h index eec0a12c5c1d..8e3fcb924db6 100644 --- a/arch/arm/include/asm/dma-iommu.h +++ b/arch/arm/include/asm/dma-iommu.h @@ -18,7 +18,6 @@ struct dma_iommu_mapping { unsigned int extensions; size_t bitmap_size; /* size of a single bitmap */ size_t bits; /* per bitmap */ - unsigned int size; /* per bitmap */ dma_addr_t base; spinlock_t lock; diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 6b00be1f971e..3d43c418e41b 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -1074,6 +1074,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, unsigned int order = get_order(size); unsigned int align = 0; unsigned int count, start; + size_t mapping_size = mapping->bits << PAGE_SHIFT; unsigned long flags; dma_addr_t iova; int i; @@ -1119,7 +1120,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, } spin_unlock_irqrestore(&mapping->lock, flags); - iova = mapping->base + (mapping->size * i); + iova = mapping->base + (mapping_size * i); iova += start << PAGE_SHIFT; return iova; @@ -1129,6 +1130,7 @@ static inline void __free_iova(struct dma_iommu_mapping *mapping, dma_addr_t addr, size_t size) { unsigned int start, count; + size_t mapping_size = mapping->bits << PAGE_SHIFT; unsigned long flags; dma_addr_t bitmap_base; u32 bitmap_index; @@ -1136,14 +1138,14 @@ static inline void __free_iova(struct dma_iommu_mapping *mapping, if (!size) return; - bitmap_index = (u32) (addr - mapping->base) / (u32) mapping->size; + bitmap_index = (u32) (addr - mapping->base) / (u32) mapping_size; BUG_ON(addr < mapping->base || bitmap_index > mapping->extensions); - bitmap_base = mapping->base + mapping->size * bitmap_index; + bitmap_base = mapping->base + mapping_size * bitmap_index; start = (addr - bitmap_base) >> PAGE_SHIFT; - if (addr + size > bitmap_base + mapping->size) { + if (addr + size > bitmap_base + mapping_size) { /* * The address range to be freed reaches into the iova * range of the next bitmap. This should not happen as @@ -1964,7 +1966,6 @@ arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size) mapping->extensions = extensions; mapping->base = base; mapping->bits = BITS_PER_BYTE * bitmap_size; - mapping->size = mapping->bits << PAGE_SHIFT; spin_lock_init(&mapping->lock); -- cgit v1.2.3 From e464ef16c4f080bb85ccf9085f92503b5b5b1e13 Mon Sep 17 00:00:00 2001 From: Gioh Kim Date: Thu, 22 May 2014 13:38:23 +0900 Subject: arm: dma-mapping: add checking cma area initialized If CMA is turned on and CMA size is set to zero, kernel should behave as if CMA was not enabled at compile time. Every dma allocation should check existence of cma area before requesting memory. Signed-off-by: Gioh Kim Signed-off-by: Joonsoo Kim Acked-by: Michal Nazarewicz [mszyprow: removed redundant empty line from the patch] Signed-off-by: --- arch/arm/mm/dma-mapping.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 3d43c418e41b..5bef858568e6 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -390,7 +390,7 @@ static int __init atomic_pool_init(void) if (!pages) goto no_pages; - if (IS_ENABLED(CONFIG_DMA_CMA)) + if (dev_get_cma_area(NULL)) ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page, atomic_pool_init); else @@ -701,7 +701,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, addr = __alloc_simple_buffer(dev, size, gfp, &page); else if (!(gfp & __GFP_WAIT)) addr = __alloc_from_pool(size, &page); - else if (!IS_ENABLED(CONFIG_DMA_CMA)) + else if (!dev_get_cma_area(dev)) addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller); else addr = __alloc_from_contiguous(dev, size, prot, &page, caller); @@ -790,7 +790,7 @@ static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr, __dma_free_buffer(page, size); } else if (__free_from_pool(cpu_addr, size)) { return; - } else if (!IS_ENABLED(CONFIG_DMA_CMA)) { + } else if (!dev_get_cma_area(dev)) { __dma_free_remap(cpu_addr, size); __dma_free_buffer(page, size); } else { -- cgit v1.2.3