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powerpc/dma: remove dma_nommu_dma_supported 

This function is largely identical to the generic version used
everywhere else.  Replace it with the generic version.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christoph Hellwig 2019-02-13 08:01:26 +01:00 committed by Michael Ellerman
parent 5a47910d76
commit 65a21b71f9
3 changed files with 2 additions and 26 deletions
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1
arch/powerpc/include/asm/dma-mapping.h
View File

@ -31,7 +31,6 @@ int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
dma_addr_t dma_nommu_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir, unsigned long attrs);
int dma_nommu_dma_supported(struct device *dev, u64 mask);
#ifdef CONFIG_NOT_COHERENT_CACHE
/*

2
arch/powerpc/kernel/dma-iommu.c
View File

@ -21,7 +21,7 @@
static inline bool dma_iommu_alloc_bypass(struct device *dev)
{
return dev->archdata.iommu_bypass && !iommu_fixed_is_weak &&
dma_nommu_dma_supported(dev, dev->coherent_dma_mask);
dma_direct_supported(dev, dev->coherent_dma_mask);
}
static inline bool dma_iommu_map_bypass(struct device *dev,

25
arch/powerpc/kernel/dma.c
View File

@ -39,29 +39,6 @@ static u64 __maybe_unused get_pfn_limit(struct device *dev)
return pfn;
}
int dma_nommu_dma_supported(struct device *dev, u64 mask)
{
#ifdef CONFIG_PPC64
u64 limit = phys_to_dma(dev, (memblock_end_of_DRAM() - 1));
/* Limit fits in the mask, we are good */
if (mask >= limit)
return 1;
#ifdef CONFIG_FSL_SOC
/*
* Freescale gets another chance via ZONE_DMA, however
* that will have to be refined if/when they support iommus
*/
return 1;
#endif
/* Sorry ... */
return 0;
#else
return 1;
#endif
}
#ifndef CONFIG_NOT_COHERENT_CACHE
void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag,
@ -190,7 +167,7 @@ const struct dma_map_ops dma_nommu_ops = {
.free = __dma_nommu_free_coherent,
.map_sg = dma_nommu_map_sg,
.unmap_sg = dma_nommu_unmap_sg,
.dma_supported = dma_nommu_dma_supported,
.dma_supported = dma_direct_supported,
.map_page = dma_nommu_map_page,
.unmap_page = dma_nommu_unmap_page,
.get_required_mask = dma_direct_get_required_mask,