1 #ifndef _LINUX_IOMMU_HELPER_H 2 #define _LINUX_IOMMU_HELPER_H 3 4 #include <linux/kernel.h> 5 6 static 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 16 extern int iommu_is_span_boundary(unsigned int index, unsigned int nr, 17 unsigned long shift, 18 unsigned long boundary_size); 19 extern 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 25 static 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