| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Thomas Gleixner | 1e19b16 | 2008-10-06 14:15:24 +0200 | [diff] [blame] | 2 | #ifndef _LINUX_IOMMU_HELPER_H |
| 3 | #define _LINUX_IOMMU_HELPER_H |
| 4 | |
| Anton Blanchard | e269b08 | 2010-08-09 17:20:23 -0700 | [diff] [blame] | 5 | #include <linux/kernel.h> |
| 6 | |
| FUJITA Tomonori | eecfffc | 2008-09-12 19:42:33 +0900 | [diff] [blame] | 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 | |
| FUJITA Tomonori | 3715863 | 2008-03-04 14:29:27 -0800 | [diff] [blame] | 17 | extern int iommu_is_span_boundary(unsigned int index, unsigned int nr, |
| 18 | unsigned long shift, |
| 19 | unsigned long boundary_size); |
| FUJITA Tomonori | 0291df8 | 2008-02-04 22:28:07 -0800 | [diff] [blame] | 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); |
| Thomas Gleixner | 1e19b16 | 2008-10-06 14:15:24 +0200 | [diff] [blame] | 25 | |
| Anton Blanchard | e269b08 | 2010-08-09 17:20:23 -0700 | [diff] [blame] | 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 | } |
| Joerg Roedel | 56d9366 | 2008-10-15 22:02:10 -0700 | [diff] [blame] | 34 | |
| Thomas Gleixner | 1e19b16 | 2008-10-06 14:15:24 +0200 | [diff] [blame] | 35 | #endif |