tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2014-2015 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16#ifndef __DMA_IOMMU_H
17#define __DMA_IOMMU_H
18
19#ifdef __KERNEL__
20#include <asm/errno.h>
21
22#ifdef CONFIG_IOMMU_DMA
23#include <linux/iommu.h>
24#include <linux/msi.h>
25
26int iommu_dma_init(void);
27
28/* Domain management interface for IOMMU drivers */
29int iommu_get_dma_cookie(struct iommu_domain *domain);
30int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
31void iommu_put_dma_cookie(struct iommu_domain *domain);
32
33/* Setup call for arch DMA mapping code */
34int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
35 u64 size, struct device *dev);
36
37/* General helpers for DMA-API <-> IOMMU-API interaction */
38int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
39 unsigned long attrs);
40
41/*
42 * These implement the bulk of the relevant DMA mapping callbacks, but require
43 * the arch code to take care of attributes and cache maintenance
44 */
45struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
46 unsigned long attrs, int prot, dma_addr_t *handle,
47 void (*flush_page)(struct device *, const void *, phys_addr_t));
48void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
49 dma_addr_t *handle);
50
51int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma);
52
53dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
54 unsigned long offset, size_t size, int prot);
55int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
56 int nents, int prot);
57
58/*
59 * Arch code with no special attribute handling may use these
60 * directly as DMA mapping callbacks for simplicity
61 */
62void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
63 enum dma_data_direction dir, unsigned long attrs);
64void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
65 enum dma_data_direction dir, unsigned long attrs);
66dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
67 size_t size, enum dma_data_direction dir, unsigned long attrs);
68void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
69 size_t size, enum dma_data_direction dir, unsigned long attrs);
70int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
71
72/* The DMA API isn't _quite_ the whole story, though... */
73void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg);
74
75#else
76
77struct iommu_domain;
78struct msi_msg;
79
80static inline int iommu_dma_init(void)
81{
82 return 0;
83}
84
85static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
86{
87 return -ENODEV;
88}
89
90static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
91{
92 return -ENODEV;
93}
94
95static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
96{
97}
98
99static inline void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg)
100{
101}
102
103#endif /* CONFIG_IOMMU_DMA */
104#endif /* __KERNEL__ */
105#endif /* __DMA_IOMMU_H */