Commit 7e91c7df authored by Stefano Stabellini's avatar Stefano Stabellini Committed by Konrad Rzeszutek Wilk

swiotlb-xen: implement xen_swiotlb_dma_mmap callback

This function creates userspace mapping for the DMA-coherent memory.
Signed-off-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: default avatarOleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
Signed-off-by: default avatarAndrii Anisov <andrii_anisov@epam.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad@kernel.org>
parent 602d9858
......@@ -198,6 +198,7 @@ static struct dma_map_ops xen_swiotlb_dma_ops = {
.unmap_page = xen_swiotlb_unmap_page,
.dma_supported = xen_swiotlb_dma_supported,
.set_dma_mask = xen_swiotlb_set_dma_mask,
.mmap = xen_swiotlb_dma_mmap,
};
int __init xen_mm_init(void)
......
......@@ -680,3 +680,22 @@ xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask)
return 0;
}
EXPORT_SYMBOL_GPL(xen_swiotlb_set_dma_mask);
/*
* Create userspace mapping for the DMA-coherent memory.
* This function should be called with the pages from the current domain only,
* passing pages mapped from other domains would lead to memory corruption.
*/
int
xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
if (__generic_dma_ops(dev)->mmap)
return __generic_dma_ops(dev)->mmap(dev, vma, cpu_addr,
dma_addr, size, attrs);
#endif
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
}
EXPORT_SYMBOL_GPL(xen_swiotlb_dma_mmap);
......@@ -55,4 +55,9 @@ xen_swiotlb_dma_supported(struct device *hwdev, u64 mask);
extern int
xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask);
extern int
xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);
#endif /* __LINUX_SWIOTLB_XEN_H */
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