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Commit 63585739 authored by Liam Mark's avatar Liam Mark
Browse files

dma-coherent: Expose device base address and size 



Allow clients to be able to determine the device base address and
size of a dma coherent memory region.

This is required for clients that want to explicitly manage that memory.

Change-Id: I3e5b721d9d318526422ec26995cc1af7b7f04077
Signed-off-by: default avatarLiam Mark <lmark@codeaurora.org>
parent 871eac76

drivers/base/dma-coherent.c

+9 −2
Original line number Diff line number Diff line
@@ -29,7 +29,7 @@ static inline struct dma_coherent_mem *dev_get_coherent_memory(struct device *de 
	return NULL;

}



static inline dma_addr_t dma_get_device_base(struct device *dev,

dma_addr_t dma_get_device_base(struct device *dev,

			       struct dma_coherent_mem *mem)

{

	if (mem->use_dev_dma_pfn_offset)
@@ -37,6 +37,13 @@ static inline dma_addr_t dma_get_device_base(struct device *dev, 
	else

		return mem->device_base;

}

EXPORT_SYMBOL(dma_get_device_base);



unsigned long dma_get_size(struct dma_coherent_mem *mem)

{

	return mem->size << PAGE_SHIFT;

}

EXPORT_SYMBOL(dma_get_size);



static int dma_init_coherent_memory(

	phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags,

include/linux/dma-mapping.h

+15 −0
Original line number Diff line number Diff line
@@ -799,6 +799,10 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, 
void dma_release_declared_memory(struct device *dev);

void *dma_mark_declared_memory_occupied(struct device *dev,

					dma_addr_t device_addr, size_t size);

dma_addr_t dma_get_device_base(struct device *dev,

			       struct dma_coherent_mem *mem);

unsigned long dma_get_size(struct dma_coherent_mem *mem);



#else

static inline int

dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
@@ -818,6 +822,17 @@ dma_mark_declared_memory_occupied(struct device *dev, 
{

	return ERR_PTR(-EBUSY);

}

static inline dma_addr_t

dma_get_device_base(struct device *dev, struct dma_coherent_mem *mem)

{

	return 0;

}



static inline unsigned long dma_get_size(struct dma_coherent_mem *mem)

{

	return 0;

}



#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */



#ifdef CONFIG_HAS_DMA