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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2014-11-21 11:04:39 +0000
committerDavid Vrabel <david.vrabel@citrix.com>2014-12-04 12:41:51 +0000
commita0f2dee0cd651efb5fac6a1d35b0a14460ebcdd4 (patch)
tree744fe380abf1d0c9676cdec3e39e31e3863ef613 /drivers/xen/swiotlb-xen.c
parent2e2a7817fdb6304f8c95c29dae0c93e2727240f4 (diff)
downloadop-kernel-dev-a0f2dee0cd651efb5fac6a1d35b0a14460ebcdd4.zip
op-kernel-dev-a0f2dee0cd651efb5fac6a1d35b0a14460ebcdd4.tar.gz
xen: add a dma_addr_t dev_addr argument to xen_dma_map_page
dev_addr is the machine address of the page. The new parameter can be used by the ARM and ARM64 implementations of xen_dma_map_page to find out if the page is a local page (pfn == mfn) or a foreign page (pfn != mfn). dev_addr could be retrieved again from the physical address, using pfn_to_mfn, but it requires accessing an rbtree. Since we already have the dev_addr in our hands at the call site there is no need to get the mfn twice. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/swiotlb-xen.c')
-rw-r--r--drivers/xen/swiotlb-xen.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index ebd8f21..ad2c5eb 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -403,7 +403,7 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
/* we are not interested in the dma_addr returned by
* xen_dma_map_page, only in the potential cache flushes executed
* by the function. */
- xen_dma_map_page(dev, page, offset, size, dir, attrs);
+ xen_dma_map_page(dev, page, dev_addr, offset, size, dir, attrs);
return dev_addr;
}
@@ -417,7 +417,7 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
return DMA_ERROR_CODE;
xen_dma_map_page(dev, pfn_to_page(map >> PAGE_SHIFT),
- map & ~PAGE_MASK, size, dir, attrs);
+ dev_addr, map & ~PAGE_MASK, size, dir, attrs);
dev_addr = xen_phys_to_bus(map);
/*
@@ -574,6 +574,7 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
return 0;
}
xen_dma_map_page(hwdev, pfn_to_page(map >> PAGE_SHIFT),
+ dev_addr,
map & ~PAGE_MASK,
sg->length,
dir,
@@ -584,6 +585,7 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
* xen_dma_map_page, only in the potential cache flushes executed
* by the function. */
xen_dma_map_page(hwdev, pfn_to_page(paddr >> PAGE_SHIFT),
+ dev_addr,
paddr & ~PAGE_MASK,
sg->length,
dir,
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