ARM: DMA-Mapping: add function for setting coherent pool size from platform code (6e5267aa) · Commits · 戴 / test

arch/arm/include/asm/dma-mapping.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -202,6 +202,13 @@ static inline void dma_free_writecombine(struct device *dev, size_t size,
		return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
		}

		/*
		* This can be called during early boot to increase the size of the atomic
		* coherent DMA pool above the default value of 256KiB. It must be called
		* before postcore_initcall.
		*/
		extern void __init init_dma_coherent_pool_size(unsigned long size);

		/*
		* This can be called during boot to increase the size of the consistent
		* DMA region above it's default value of 2MB. It must be called before the

+18 −1

Original line number	Diff line number	Diff line
		@@ -267,6 +267,8 @@ static void __dma_free_remap(void *cpu_addr, size_t size)
		vunmap(cpu_addr);
		}

		#define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K

		struct dma_pool {
		size_t size;
		spinlock_t lock;
		@@ -277,7 +279,7 @@ struct dma_pool {
		};

		static struct dma_pool atomic_pool = {
		.size = SZ_256K,
		.size = DEFAULT_DMA_COHERENT_POOL_SIZE,
		};

		static int __init early_coherent_pool(char *p)
		@@ -287,6 +289,21 @@ static int __init early_coherent_pool(char *p)
		}
		early_param("coherent_pool", early_coherent_pool);

		void __init init_dma_coherent_pool_size(unsigned long size)
		{
		/*
		* Catch any attempt to set the pool size too late.
		*/
		BUG_ON(atomic_pool.vaddr);

		/*
		* Set architecture specific coherent pool size only if
		* it has not been changed by kernel command line parameter.
		*/
		if (atomic_pool.size == DEFAULT_DMA_COHERENT_POOL_SIZE)
		atomic_pool.size = size;
		}

		/*
		* Initialise the coherent pool for atomic allocations.
		*/