1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_IOMMU_HELPER_H
3 #define _LINUX_IOMMU_HELPER_H
6 #include <linux/kernel.h>
8 static inline unsigned long iommu_device_max_index(unsigned long size,
12 if (size + offset > dma_mask)
13 return dma_mask - offset + 1;
18 static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr,
19 unsigned long shift, unsigned long boundary_size)
21 BUG_ON(!is_power_of_2(boundary_size));
23 shift = (shift + index) & (boundary_size - 1);
24 return shift + nr > boundary_size;
27 extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
28 unsigned long start, unsigned int nr,
30 unsigned long boundary_size,
31 unsigned long align_mask);
33 static inline unsigned long iommu_num_pages(unsigned long addr,
35 unsigned long io_page_size)
37 unsigned long size = (addr & (io_page_size - 1)) + len;
39 return DIV_ROUND_UP(size, io_page_size);