projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 1e19b16a TG |
2 | #ifndef _LINUX_IOMMU_HELPER_H |
| 3 | #define _LINUX_IOMMU_HELPER_H | |
| 4 | ||
| 79c1879e | 5 | #include <linux/bug.h> |
| aa6159ab AS |
6 | #include <linux/log2.h> |
| 7 | #include <linux/math.h> | |
| 8 | #include <linux/types.h> | |
| e269b085 | 9 | |
| eecfffc1 FT |
10 | static inline unsigned long iommu_device_max_index(unsigned long size, |
| 11 | unsigned long offset, | |
| 12 | u64 dma_mask) | |
| 13 | { | |
| 14 | if (size + offset > dma_mask) | |
| 15 | return dma_mask - offset + 1; | |
| 16 | else | |
| 17 | return size; | |
| 18 | } | |
| 19 | ||
| 79c1879e CH |
20 | static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr, |
| 21 | unsigned long shift, unsigned long boundary_size) | |
| 22 | { | |
| 23 | BUG_ON(!is_power_of_2(boundary_size)); | |
| 24 | ||
| 25 | shift = (shift + index) & (boundary_size - 1); | |
| 26 | return shift + nr > boundary_size; | |
| 27 | } | |
| 28 | ||
| 0291df8c FT |
29 | extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, |
| 30 | unsigned long start, unsigned int nr, | |
| 31 | unsigned long shift, | |
| 32 | unsigned long boundary_size, | |
| 33 | unsigned long align_mask); | |
| 1e19b16a | 34 | |
| e269b085 AB |
35 | static inline unsigned long iommu_num_pages(unsigned long addr, |
| 36 | unsigned long len, | |
| 37 | unsigned long io_page_size) | |
| 38 | { | |
| 39 | unsigned long size = (addr & (io_page_size - 1)) + len; | |
| 40 | ||
| 41 | return DIV_ROUND_UP(size, io_page_size); | |
| 42 | } | |
| 56d93660 | 43 | |
| 1e19b16a | 44 | #endif |