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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_IOMMU_HELPER_H
3 #define _LINUX_IOMMU_HELPER_H
6 #include <linux/kernel.h>
8 static inline unsigned long iommu_device_max_index(unsigned long size
,
12 if (size
+ offset
> dma_mask
)
13 return dma_mask
- offset
+ 1;
18 static inline int iommu_is_span_boundary(unsigned int index
, unsigned int nr
,
19 unsigned long shift
, unsigned long boundary_size
)
21 BUG_ON(!is_power_of_2(boundary_size
));
23 shift
= (shift
+ index
) & (boundary_size
- 1);
24 return shift
+ nr
> boundary_size
;
27 extern unsigned long iommu_area_alloc(unsigned long *map
, unsigned long size
,
28 unsigned long start
, unsigned int nr
,
30 unsigned long boundary_size
,
31 unsigned long align_mask
);
33 static inline unsigned long iommu_num_pages(unsigned long addr
,
35 unsigned long io_page_size
)
37 unsigned long size
= (addr
& (io_page_size
- 1)) + len
;
39 return DIV_ROUND_UP(size
, io_page_size
);