1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_IOMMU_HELPER_H |
3 | #define _LINUX_IOMMU_HELPER_H |
4 | |
5 | #include <linux/bug.h> |
6 | #include <linux/log2.h> |
7 | #include <linux/math.h> |
8 | #include <linux/types.h> |
9 | |
10 | static inline unsigned long iommu_device_max_index(unsigned long size, |
11 | unsigned long offset, |
12 | u64 dma_mask) |
13 | { |
14 | if (size + offset > dma_mask) |
15 | return dma_mask - offset + 1; |
16 | else |
17 | return size; |
18 | } |
19 | |
20 | static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr, |
21 | unsigned long shift, unsigned long boundary_size) |
22 | { |
23 | BUG_ON(!is_power_of_2(boundary_size)); |
24 | |
25 | shift = (shift + index) & (boundary_size - 1); |
26 | return shift + nr > boundary_size; |
27 | } |
28 | |
29 | extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, |
30 | unsigned long start, unsigned int nr, |
31 | unsigned long shift, |
32 | unsigned long boundary_size, |
33 | unsigned long align_mask); |
34 | |
35 | static inline unsigned long iommu_num_pages(unsigned long addr, |
36 | unsigned long len, |
37 | unsigned long io_page_size) |
38 | { |
39 | unsigned long size = (addr & (io_page_size - 1)) + len; |
40 | |
41 | return DIV_ROUND_UP(size, io_page_size); |
42 | } |
43 | |
44 | #endif |
45 | |