tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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/dma-debug.h>
10#include <linux/kref.h>
11
12#define ARM_MAPPING_ERROR (~(dma_addr_t)0x0)
13
14struct dma_iommu_mapping {
15 /* iommu specific data */
16 struct iommu_domain *domain;
17
18 unsigned long **bitmaps; /* array of bitmaps */
19 unsigned int nr_bitmaps; /* nr of elements in array */
20 unsigned int extensions;
21 size_t bitmap_size; /* size of a single bitmap */
22 size_t bits; /* per bitmap */
23 dma_addr_t base;
24
25 spinlock_t lock;
26 struct kref kref;
27};
28
29struct dma_iommu_mapping *
30arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size);
31
32void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
33
34int arm_iommu_attach_device(struct device *dev,
35 struct dma_iommu_mapping *mapping);
36void arm_iommu_detach_device(struct device *dev);
37
38int arm_dma_supported(struct device *dev, u64 mask);
39
40#endif /* __KERNEL__ */
41#endif