1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_IOMMU_HELPER_H 3 #define _LINUX_IOMMU_HELPER_H 4 5 #include <linux/bug.h> 6 #include <linux/kernel.h> 7 8 static inline unsigned long iommu_device_max_index(unsigned long size, 9 unsigned long offset, 10 u64 dma_mask) 11 { 12 if (size + offset > dma_mask) 13 return dma_mask - offset + 1; 14 else 15 return size; 16 } 17 18 static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr, 19 unsigned long shift, unsigned long boundary_size) 20 { 21 BUG_ON(!is_power_of_2(boundary_size)); 22 23 shift = (shift + index) & (boundary_size - 1); 24 return shift + nr > boundary_size; 25 } 26 27 extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, 28 unsigned long start, unsigned int nr, 29 unsigned long shift, 30 unsigned long boundary_size, 31 unsigned long align_mask); 32 33 static inline unsigned long iommu_num_pages(unsigned long addr, 34 unsigned long len, 35 unsigned long io_page_size) 36 { 37 unsigned long size = (addr & (io_page_size - 1)) + len; 38 39 return DIV_ROUND_UP(size, io_page_size); 40 } 41 42 #endif 43