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xen-swiotlb: implement ->mapping_error 

DMA_ERROR_CODE is going to go away, so don't rely on it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Christoph Hellwig 2017-05-21 13:23:27 +02:00
parent dceb1a6819
commit 4d048dbc05
1 changed files with 10 additions and 2 deletions
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12
drivers/xen/swiotlb-xen.c
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@ -67,6 +67,8 @@ static unsigned long dma_alloc_coherent_mask(struct device *dev,
}
#endif
#define XEN_SWIOTLB_ERROR_CODE (~(dma_addr_t)0x0)
static char *xen_io_tlb_start, *xen_io_tlb_end;
static unsigned long xen_io_tlb_nslabs;
/*
@ -410,7 +412,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir,
attrs);
if (map == SWIOTLB_MAP_ERROR)
return DMA_ERROR_CODE;
return XEN_SWIOTLB_ERROR_CODE;
dev_addr = xen_phys_to_bus(map);
xen_dma_map_page(dev, pfn_to_page(map >> PAGE_SHIFT),
@ -425,7 +427,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
attrs |= DMA_ATTR_SKIP_CPU_SYNC;
swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);
return DMA_ERROR_CODE;
return XEN_SWIOTLB_ERROR_CODE;
}
/*
@ -715,6 +717,11 @@ xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
return dma_common_get_sgtable(dev, sgt, cpu_addr, handle, size);
}
static int xen_swiotlb_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return dma_addr == XEN_SWIOTLB_ERROR_CODE;
}
const struct dma_map_ops xen_swiotlb_dma_ops = {
.alloc = xen_swiotlb_alloc_coherent,
.free = xen_swiotlb_free_coherent,
@ -730,4 +737,5 @@ const struct dma_map_ops xen_swiotlb_dma_ops = {
.set_dma_mask = xen_swiotlb_set_dma_mask,
.mmap = xen_swiotlb_dma_mmap,
.get_sgtable = xen_swiotlb_get_sgtable,
.mapping_error = xen_swiotlb_mapping_error,
};