1 #ifndef _ASM_ARM_XEN_PAGE_COHERENT_H
2 #define _ASM_ARM_XEN_PAGE_COHERENT_H
5 #include <linux/dma-mapping.h>
7 void __xen_dma_map_page(struct device *hwdev, struct page *page,
8 dma_addr_t dev_addr, unsigned long offset, size_t size,
9 enum dma_data_direction dir, unsigned long attrs);
10 void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
11 size_t size, enum dma_data_direction dir,
13 void __xen_dma_sync_single_for_cpu(struct device *hwdev,
14 dma_addr_t handle, size_t size, enum dma_data_direction dir);
16 void __xen_dma_sync_single_for_device(struct device *hwdev,
17 dma_addr_t handle, size_t size, enum dma_data_direction dir);
19 static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
20 dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
22 return __generic_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs);
25 static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
26 void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
28 __generic_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
31 static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
32 dma_addr_t dev_addr, unsigned long offset, size_t size,
33 enum dma_data_direction dir, unsigned long attrs)
35 unsigned long page_pfn = page_to_xen_pfn(page);
36 unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
37 unsigned long compound_pages =
38 (1<<compound_order(page)) * XEN_PFN_PER_PAGE;
39 bool local = (page_pfn <= dev_pfn) &&
40 (dev_pfn - page_pfn < compound_pages);
43 * Dom0 is mapped 1:1, while the Linux page can span across
44 * multiple Xen pages, it's not possible for it to contain a
45 * mix of local and foreign Xen pages. So if the first xen_pfn
46 * == mfn the page is local otherwise it's a foreign page
47 * grant-mapped in dom0. If the page is local we can safely
48 * call the native dma_ops function, otherwise we call the xen
52 __generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
54 __xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
57 static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
58 size_t size, enum dma_data_direction dir, unsigned long attrs)
60 unsigned long pfn = PFN_DOWN(handle);
62 * Dom0 is mapped 1:1, while the Linux page can be spanned accross
63 * multiple Xen page, it's not possible to have a mix of local and
64 * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
65 * foreign mfn will always return false. If the page is local we can
66 * safely call the native dma_ops function, otherwise we call the xen
70 if (__generic_dma_ops(hwdev)->unmap_page)
71 __generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
73 __xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
76 static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
77 dma_addr_t handle, size_t size, enum dma_data_direction dir)
79 unsigned long pfn = PFN_DOWN(handle);
81 if (__generic_dma_ops(hwdev)->sync_single_for_cpu)
82 __generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
84 __xen_dma_sync_single_for_cpu(hwdev, handle, size, dir);
87 static inline void xen_dma_sync_single_for_device(struct device *hwdev,
88 dma_addr_t handle, size_t size, enum dma_data_direction dir)
90 unsigned long pfn = PFN_DOWN(handle);
92 if (__generic_dma_ops(hwdev)->sync_single_for_device)
93 __generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
95 __xen_dma_sync_single_for_device(hwdev, handle, size, dir);
98 #endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */