1#ifndef _ASM_ARM_XEN_PAGE_COHERENT_H
2#define _ASM_ARM_XEN_PAGE_COHERENT_H
3
4#include <asm/page.h>
5#include <linux/dma-attrs.h>
6#include <linux/dma-mapping.h>
7
8void __xen_dma_map_page(struct device *hwdev, struct page *page,
9	     dma_addr_t dev_addr, unsigned long offset, size_t size,
10	     enum dma_data_direction dir, struct dma_attrs *attrs);
11void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
12		size_t size, enum dma_data_direction dir,
13		struct dma_attrs *attrs);
14void __xen_dma_sync_single_for_cpu(struct device *hwdev,
15		dma_addr_t handle, size_t size, enum dma_data_direction dir);
16
17void __xen_dma_sync_single_for_device(struct device *hwdev,
18		dma_addr_t handle, size_t size, enum dma_data_direction dir);
19
20static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
21		dma_addr_t *dma_handle, gfp_t flags,
22		struct dma_attrs *attrs)
23{
24	return __generic_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs);
25}
26
27static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
28		void *cpu_addr, dma_addr_t dma_handle,
29		struct dma_attrs *attrs)
30{
31	__generic_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
32}
33
34static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
35	     dma_addr_t dev_addr, unsigned long offset, size_t size,
36	     enum dma_data_direction dir, struct dma_attrs *attrs)
37{
38	bool local = PFN_DOWN(dev_addr) == page_to_pfn(page);
39	/* Dom0 is mapped 1:1, so if pfn == mfn the page is local otherwise
40	 * is a foreign page grant-mapped in dom0. If the page is local we
41	 * can safely call the native dma_ops function, otherwise we call
42	 * the xen specific function. */
43	if (local)
44		__generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
45	else
46		__xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
47}
48
49static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
50		size_t size, enum dma_data_direction dir,
51		struct dma_attrs *attrs)
52{
53	unsigned long pfn = PFN_DOWN(handle);
54	/* Dom0 is mapped 1:1, so calling pfn_valid on a foreign mfn will
55	 * always return false. If the page is local we can safely call the
56	 * native dma_ops function, otherwise we call the xen specific
57	 * function. */
58	if (pfn_valid(pfn)) {
59		if (__generic_dma_ops(hwdev)->unmap_page)
60			__generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
61	} else
62		__xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
63}
64
65static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
66		dma_addr_t handle, size_t size, enum dma_data_direction dir)
67{
68	unsigned long pfn = PFN_DOWN(handle);
69	if (pfn_valid(pfn)) {
70		if (__generic_dma_ops(hwdev)->sync_single_for_cpu)
71			__generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
72	} else
73		__xen_dma_sync_single_for_cpu(hwdev, handle, size, dir);
74}
75
76static inline void xen_dma_sync_single_for_device(struct device *hwdev,
77		dma_addr_t handle, size_t size, enum dma_data_direction dir)
78{
79	unsigned long pfn = PFN_DOWN(handle);
80	if (pfn_valid(pfn)) {
81		if (__generic_dma_ops(hwdev)->sync_single_for_device)
82			__generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
83	} else
84		__xen_dma_sync_single_for_device(hwdev, handle, size, dir);
85}
86
87#endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */
88