| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_IOMMU_HELPER_H |
| #define _LINUX_IOMMU_HELPER_H |
| |
| #include <linux/bug.h> |
| #include <linux/log2.h> |
| #include <linux/math.h> |
| #include <linux/types.h> |
| |
| static inline unsigned long iommu_device_max_index(unsigned long size, |
| unsigned long offset, |
| u64 dma_mask) |
| { |
| if (size + offset > dma_mask) |
| return dma_mask - offset + 1; |
| else |
| return size; |
| } |
| |
| static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr, |
| unsigned long shift, unsigned long boundary_size) |
| { |
| BUG_ON(!is_power_of_2(boundary_size)); |
| |
| shift = (shift + index) & (boundary_size - 1); |
| return shift + nr > boundary_size; |
| } |
| |
| extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, |
| unsigned long start, unsigned int nr, |
| unsigned long shift, |
| unsigned long boundary_size, |
| unsigned long align_mask); |
| |
| static inline unsigned long iommu_num_pages(unsigned long addr, |
| unsigned long len, |
| unsigned long io_page_size) |
| { |
| unsigned long size = (addr & (io_page_size - 1)) + len; |
| |
| return DIV_ROUND_UP(size, io_page_size); |
| } |
| |
| #endif |
