1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_IOMMU_HELPER_H 3 #define _LINUX_IOMMU_HELPER_H 4 5 #include <linux/kernel.h> 6 7 static inline unsigned long iommu_device_max_index(unsigned long size, 8 unsigned long offset, 9 u64 dma_mask) 10 { 11 if (size + offset > dma_mask) 12 return dma_mask - offset + 1; 13 else 14 return size; 15 } 16 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); 25 26 static inline unsigned long iommu_num_pages(unsigned long addr, 27 unsigned long len, 28 unsigned long io_page_size) 29 { 30 unsigned long size = (addr & (io_page_size - 1)) + len; 31 32 return DIV_ROUND_UP(size, io_page_size); 33 } 34 35 #endif 36