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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2014-11-21 14:04:39 +0300 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2014-12-04 15:41:51 +0300 |
| commit | a0f2dee0cd651efb5fac6a1d35b0a14460ebcdd4 (patch) | |
| tree | 744fe380abf1d0c9676cdec3e39e31e3863ef613 /arch/x86/include/asm/xen | |
| parent | 2e2a7817fdb6304f8c95c29dae0c93e2727240f4 (diff) | |
| download | linux-a0f2dee0cd651efb5fac6a1d35b0a14460ebcdd4.tar.xz | |
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 'arch/x86/include/asm/xen')
| -rw-r--r-- | arch/x86/include/asm/xen/page-coherent.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/xen/page-coherent.h b/arch/x86/include/asm/xen/page-coherent.h index 7f02fe4e2c7b..acd844c017d3 100644 --- a/arch/x86/include/asm/xen/page-coherent.h +++ b/arch/x86/include/asm/xen/page-coherent.h @@ -22,8 +22,8 @@ static inline void xen_free_coherent_pages(struct device *hwdev, size_t size, } static inline void xen_dma_map_page(struct device *hwdev, struct page *page, - unsigned long offset, size_t size, enum dma_data_direction dir, - struct dma_attrs *attrs) { } + dma_addr_t dev_addr, unsigned long offset, size_t size, + enum dma_data_direction dir, struct dma_attrs *attrs) { } static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir, |