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/kernel.h>
7
iommu_device_max_index(unsigned long size,unsigned long offset,u64 dma_mask)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
iommu_is_span_boundary(unsigned int index,unsigned int nr,unsigned long shift,unsigned long boundary_size)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
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);
32
iommu_num_pages(unsigned long addr,unsigned long len,unsigned long io_page_size)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 }
41
42 #endif
43
