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xen: introduce xen_dma_map/unmap_page and xen_dma_sync_single_for_cpu/device

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Introduce xen_dma_map_page, xen_dma_unmap_page,
xen_dma_sync_single_for_cpu and xen_dma_sync_single_for_device.
They have empty implementations on x86 and ia64 but they call the
corresponding platform dma_ops function on arm and arm64.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Changes in v9:
- xen_dma_map_page return void, avoid page_to_phys.
This commit is contained in:
Stefano Stabellini
2013-10-25 10:39:49 +00:00
parent 1b65c4e5a9
commit 7100b077ab
4 changed files with 81 additions and 0 deletions
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14
arch/x86/include/asm/xen/page-coherent.h
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@@ -21,4 +21,18 @@ static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
free_pages((unsigned long) cpu_addr, get_order(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) { }
static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs) { }
static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
static inline void xen_dma_sync_single_for_device(struct device *hwdev,
dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
#endif /* _ASM_X86_XEN_PAGE_COHERENT_H */