Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / include / linux / iommu-helper.h
blobcb9a9248c8c0c52656b8976293d0689349fee8c0
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_IOMMU_HELPER_H
3 #define _LINUX_IOMMU_HELPER_H
5 #include <linux/kernel.h>
7 static inline unsigned long iommu_device_max_index(unsigned long size,
8 unsigned long offset,
9 u64 dma_mask)
11 if (size + offset > dma_mask)
12 return dma_mask - offset + 1;
13 else
14 return size;
17 extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
18 unsigned long shift,
19 unsigned long boundary_size);
20 extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
21 unsigned long start, unsigned int nr,
22 unsigned long shift,
23 unsigned long boundary_size,
24 unsigned long align_mask);
26 static inline unsigned long iommu_num_pages(unsigned long addr,
27 unsigned long len,
28 unsigned long io_page_size)
30 unsigned long size = (addr & (io_page_size - 1)) + len;
32 return DIV_ROUND_UP(size, io_page_size);
35 #endif