Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1e19b16a TG |
2 | #ifndef _LINUX_IOMMU_HELPER_H |
3 | #define _LINUX_IOMMU_HELPER_H | |
4 | ||
79c1879e | 5 | #include <linux/bug.h> |
e269b085 AB |
6 | #include <linux/kernel.h> |
7 | ||
eecfffc1 FT |
8 | static inline unsigned long iommu_device_max_index(unsigned long size, |
9 | unsigned long offset, | |
10 | u64 dma_mask) | |
11 | { | |
12 | if (size + offset > dma_mask) | |
13 | return dma_mask - offset + 1; | |
14 | else | |
15 | return size; | |
16 | } | |
17 | ||
79c1879e CH |
18 | static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr, |
19 | unsigned long shift, unsigned long boundary_size) | |
20 | { | |
21 | BUG_ON(!is_power_of_2(boundary_size)); | |
22 | ||
23 | shift = (shift + index) & (boundary_size - 1); | |
24 | return shift + nr > boundary_size; | |
25 | } | |
26 | ||
0291df8c FT |
27 | extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, |
28 | unsigned long start, unsigned int nr, | |
29 | unsigned long shift, | |
30 | unsigned long boundary_size, | |
31 | unsigned long align_mask); | |
1e19b16a | 32 | |
e269b085 AB |
33 | static inline unsigned long iommu_num_pages(unsigned long addr, |
34 | unsigned long len, | |
35 | unsigned long io_page_size) | |
36 | { | |
37 | unsigned long size = (addr & (io_page_size - 1)) + len; | |
38 | ||
39 | return DIV_ROUND_UP(size, io_page_size); | |
40 | } | |
56d93660 | 41 | |
1e19b16a | 42 | #endif |