1#ifndef ASMARM_DMA_IOMMU_H
 2#define ASMARM_DMA_IOMMU_H
 3
 4#ifdef __KERNEL__
 5
 6#include <linux/mm_types.h>
 7#include <linux/scatterlist.h>
 8#include <linux/dma-debug.h>
 9#include <linux/kmemcheck.h>
10#include <linux/kref.h>
11
12struct dma_iommu_mapping {
13	/* iommu specific data */
14	struct iommu_domain	*domain;
15
16	unsigned long		**bitmaps;	/* array of bitmaps */
17	unsigned int		nr_bitmaps;	/* nr of elements in array */
18	unsigned int		extensions;
19	size_t			bitmap_size;	/* size of a single bitmap */
20	size_t			bits;		/* per bitmap */
21	unsigned int		size;		/* per bitmap */
22	dma_addr_t		base;
23
24	spinlock_t		lock;
25	struct kref		kref;
26};
27
28struct dma_iommu_mapping *
29arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size);
30
31void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
32
33int arm_iommu_attach_device(struct device *dev,
34					struct dma_iommu_mapping *mapping);
35void arm_iommu_detach_device(struct device *dev);
36
37#endif /* __KERNEL__ */
38#endif

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef ASMARM_DMA_IOMMU_H
 3#define ASMARM_DMA_IOMMU_H
 4
 5#ifdef __KERNEL__
 6
 7#include <linux/mm_types.h>
 8#include <linux/scatterlist.h>
 
 
 9#include <linux/kref.h>
10
11struct dma_iommu_mapping {
12	/* iommu specific data */
13	struct iommu_domain	*domain;
14
15	unsigned long		**bitmaps;	/* array of bitmaps */
16	unsigned int		nr_bitmaps;	/* nr of elements in array */
17	unsigned int		extensions;
18	size_t			bitmap_size;	/* size of a single bitmap */
19	size_t			bits;		/* per bitmap */
 
20	dma_addr_t		base;
21
22	spinlock_t		lock;
23	struct kref		kref;
24};
25
26struct dma_iommu_mapping *
27arm_iommu_create_mapping(const struct bus_type *bus, dma_addr_t base, u64 size);
28
29void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
30
31int arm_iommu_attach_device(struct device *dev,
32					struct dma_iommu_mapping *mapping);
33void arm_iommu_detach_device(struct device *dev);
34
35#endif /* __KERNEL__ */
36#endif