xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dma-mapping: move swiotlb arch helpers to a new header

Browse Source 
phys_to_dma, dma_to_phys and dma_capable are helpers published by
architecture code for use of swiotlb and xen-swiotlb only.  Drivers are
not supposed to use these directly, but use the DMA API instead.

Move these to a new asm/dma-direct.h helper, included by a
linux/dma-direct.h wrapper that provides the default linear mapping
unless the architecture wants to override it.

In the MIPS case the existing dma-coherent.h is reused for now as
untangling it will take a bit of work.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig
2018-01-10 16:21:13 +01:00
parent 10dac04c79
commit ea8c64ace8
34 changed files with 165 additions and 195 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
arch/arm/include/asm/dma-mapping.h
View File

@@ -109,37 +109,6 @@ static inline bool is_device_dma_coherent(struct device *dev)
return dev->archdata.dma_coherent;
}
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
unsigned int offset = paddr & ~PAGE_MASK;
return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
}
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
{
unsigned int offset = dev_addr & ~PAGE_MASK;
return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
}
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
u64 limit, mask;
if (!dev->dma_mask)
return 0;
mask = *dev->dma_mask;
limit = (mask + 1) & ~mask;
if (limit && size > limit)
return 0;
if ((addr | (addr + size - 1)) & ~mask)
return 0;
return 1;
}
static inline void dma_mark_clean(void *addr, size_t size) { }
/**