1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_ARM_XEN_PAGE_COHERENT_H
3 #define _ASM_ARM_XEN_PAGE_COHERENT_H
5 #include <linux/dma-mapping.h>
7 #include <xen/arm/page-coherent.h>
9 static inline const struct dma_map_ops *xen_get_dma_ops(struct device *dev)
11 if (dev && dev->archdata.dev_dma_ops)
12 return dev->archdata.dev_dma_ops;
13 return get_arch_dma_ops(NULL);
16 static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
17 dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
19 return xen_get_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs);
22 static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
23 void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
25 xen_get_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
28 static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
29 dma_addr_t dev_addr, unsigned long offset, size_t size,
30 enum dma_data_direction dir, unsigned long attrs)
32 unsigned long page_pfn = page_to_xen_pfn(page);
33 unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
34 unsigned long compound_pages =
35 (1<<compound_order(page)) * XEN_PFN_PER_PAGE;
36 bool local = (page_pfn <= dev_pfn) &&
37 (dev_pfn - page_pfn < compound_pages);
40 * Dom0 is mapped 1:1, while the Linux page can span across
41 * multiple Xen pages, it's not possible for it to contain a
42 * mix of local and foreign Xen pages. So if the first xen_pfn
43 * == mfn the page is local otherwise it's a foreign page
44 * grant-mapped in dom0. If the page is local we can safely
45 * call the native dma_ops function, otherwise we call the xen
49 xen_get_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
51 __xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
54 static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
55 size_t size, enum dma_data_direction dir, unsigned long attrs)
57 unsigned long pfn = PFN_DOWN(handle);
59 * Dom0 is mapped 1:1, while the Linux page can be spanned accross
60 * multiple Xen page, it's not possible to have a mix of local and
61 * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
62 * foreign mfn will always return false. If the page is local we can
63 * safely call the native dma_ops function, otherwise we call the xen
67 if (xen_get_dma_ops(hwdev)->unmap_page)
68 xen_get_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
70 __xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
73 static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
74 dma_addr_t handle, size_t size, enum dma_data_direction dir)
76 unsigned long pfn = PFN_DOWN(handle);
78 if (xen_get_dma_ops(hwdev)->sync_single_for_cpu)
79 xen_get_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
81 __xen_dma_sync_single_for_cpu(hwdev, handle, size, dir);
84 static inline void xen_dma_sync_single_for_device(struct device *hwdev,
85 dma_addr_t handle, size_t size, enum dma_data_direction dir)
87 unsigned long pfn = PFN_DOWN(handle);
89 if (xen_get_dma_ops(hwdev)->sync_single_for_device)
90 xen_get_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
92 __xen_dma_sync_single_for_device(hwdev, handle, size, dir);
95 #endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */