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swiotlb-xen: implement xen_swiotlb_get_sgtable callback

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Signed-off-by: Andrii Anisov <[email protected]>
Signed-off-by: Stefano Stabellini <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
This commit is contained in:
Andrii Anisov 2017-02-07 19:58:03 +02:00 • committed by Konrad Rzeszutek Wilk
commit 69369f52d2
3 changed files with 35 additions and 0 deletions
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28
drivers/xen/swiotlb-xen.c
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@ -699,3 +699,31 @@ xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
}
EXPORT_SYMBOL_GPL(xen_swiotlb_dma_mmap);
/*
* 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_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t handle, size_t size,
unsigned long attrs)
{
#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
if (__generic_dma_ops(dev)->get_sgtable) {
#if 0
/*
* This check verifies that the page belongs to the current domain and
* is not one mapped from another domain.
* This check is for debug only, and should not go to production build
*/
unsigned long bfn = PHYS_PFN(dma_to_phys(dev, handle));
BUG_ON (!page_is_ram(bfn));
#endif
return __generic_dma_ops(dev)->get_sgtable(dev, sgt, cpu_addr,
handle, size, attrs);
}
#endif
return dma_common_get_sgtable(dev, sgt, cpu_addr, handle, size);
}
EXPORT_SYMBOL_GPL(xen_swiotlb_get_sgtable);