1#ifndef _LINUX_IOMMU_HELPER_H 2#define _LINUX_IOMMU_HELPER_H 3 4#include <linux/kernel.h> 5 6static inline unsigned long iommu_device_max_index(unsigned long size, 7 unsigned long offset, 8 u64 dma_mask) 9{ 10 if (size + offset > dma_mask) 11 return dma_mask - offset + 1; 12 else 13 return size; 14} 15 16extern int iommu_is_span_boundary(unsigned int index, unsigned int nr, 17 unsigned long shift, 18 unsigned long boundary_size); 19extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, 20 unsigned long start, unsigned int nr, 21 unsigned long shift, 22 unsigned long boundary_size, 23 unsigned long align_mask); 24 25static inline unsigned long iommu_num_pages(unsigned long addr, 26 unsigned long len, 27 unsigned long io_page_size) 28{ 29 unsigned long size = (addr & (io_page_size - 1)) + len; 30 31 return DIV_ROUND_UP(size, io_page_size); 32} 33 34#endif 35