| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 |