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1 | #ifndef _LINUX_IOMMU_HELPER_H | |
2 | #define _LINUX_IOMMU_HELPER_H | |
3 | ||
4 | #include <linux/kernel.h> | |
5 | ||
6 | static inline unsigned long iommu_device_max_index(unsigned long size, | |
7 | unsigned long offset, | |
8 | u64 dma_mask) | |
9 | { | |
10 | if (size + offset > dma_mask) | |
11 | return dma_mask - offset + 1; | |
12 | else | |
13 | return size; | |
14 | } | |
15 | ||
16 | extern int iommu_is_span_boundary(unsigned int index, unsigned int nr, | |
17 | unsigned long shift, | |
18 | unsigned long boundary_size); | |
19 | extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, | |
20 | unsigned long start, unsigned int nr, | |
21 | unsigned long shift, | |
22 | unsigned long boundary_size, | |
23 | unsigned long align_mask); | |
24 | ||
25 | static inline unsigned long iommu_num_pages(unsigned long addr, | |
26 | unsigned long len, | |
27 | unsigned long io_page_size) | |
28 | { | |
29 | unsigned long size = (addr & (io_page_size - 1)) + len; | |
30 | ||
31 | return DIV_ROUND_UP(size, io_page_size); | |
32 | } | |
33 | ||
34 | #endif |