Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _LINUX_DMA_MAPPING_H
2#define _LINUX_DMA_MAPPING_H
3
4#include <linux/device.h>
5#include <linux/err.h>
6#include <linux/dma-attrs.h>
7#include <linux/dma-direction.h>
8#include <linux/scatterlist.h>
9
10struct dma_map_ops {
11 void* (*alloc_coherent)(struct device *dev, size_t size,
12 dma_addr_t *dma_handle, gfp_t gfp);
13 void (*free_coherent)(struct device *dev, size_t size,
14 void *vaddr, dma_addr_t dma_handle);
15 dma_addr_t (*map_page)(struct device *dev, struct page *page,
16 unsigned long offset, size_t size,
17 enum dma_data_direction dir,
18 struct dma_attrs *attrs);
19 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
20 size_t size, enum dma_data_direction dir,
21 struct dma_attrs *attrs);
22 int (*map_sg)(struct device *dev, struct scatterlist *sg,
23 int nents, enum dma_data_direction dir,
24 struct dma_attrs *attrs);
25 void (*unmap_sg)(struct device *dev,
26 struct scatterlist *sg, int nents,
27 enum dma_data_direction dir,
28 struct dma_attrs *attrs);
29 void (*sync_single_for_cpu)(struct device *dev,
30 dma_addr_t dma_handle, size_t size,
31 enum dma_data_direction dir);
32 void (*sync_single_for_device)(struct device *dev,
33 dma_addr_t dma_handle, size_t size,
34 enum dma_data_direction dir);
35 void (*sync_sg_for_cpu)(struct device *dev,
36 struct scatterlist *sg, int nents,
37 enum dma_data_direction dir);
38 void (*sync_sg_for_device)(struct device *dev,
39 struct scatterlist *sg, int nents,
40 enum dma_data_direction dir);
41 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
42 int (*dma_supported)(struct device *dev, u64 mask);
43 int (*set_dma_mask)(struct device *dev, u64 mask);
44 int is_phys;
45};
46
47#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
48
49#define DMA_MASK_NONE 0x0ULL
50
51static inline int valid_dma_direction(int dma_direction)
52{
53 return ((dma_direction == DMA_BIDIRECTIONAL) ||
54 (dma_direction == DMA_TO_DEVICE) ||
55 (dma_direction == DMA_FROM_DEVICE));
56}
57
58static inline int is_device_dma_capable(struct device *dev)
59{
60 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
61}
62
63#ifdef CONFIG_HAS_DMA
64#include <asm/dma-mapping.h>
65#else
66#include <asm-generic/dma-mapping-broken.h>
67#endif
68
69static inline u64 dma_get_mask(struct device *dev)
70{
71 if (dev && dev->dma_mask && *dev->dma_mask)
72 return *dev->dma_mask;
73 return DMA_BIT_MASK(32);
74}
75
76#ifdef ARCH_HAS_DMA_SET_COHERENT_MASK
77int dma_set_coherent_mask(struct device *dev, u64 mask);
78#else
79static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
80{
81 if (!dma_supported(dev, mask))
82 return -EIO;
83 dev->coherent_dma_mask = mask;
84 return 0;
85}
86#endif
87
88extern u64 dma_get_required_mask(struct device *dev);
89
90static inline unsigned int dma_get_max_seg_size(struct device *dev)
91{
92 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
93}
94
95static inline unsigned int dma_set_max_seg_size(struct device *dev,
96 unsigned int size)
97{
98 if (dev->dma_parms) {
99 dev->dma_parms->max_segment_size = size;
100 return 0;
101 } else
102 return -EIO;
103}
104
105static inline unsigned long dma_get_seg_boundary(struct device *dev)
106{
107 return dev->dma_parms ?
108 dev->dma_parms->segment_boundary_mask : 0xffffffff;
109}
110
111static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
112{
113 if (dev->dma_parms) {
114 dev->dma_parms->segment_boundary_mask = mask;
115 return 0;
116 } else
117 return -EIO;
118}
119
120#ifdef CONFIG_HAS_DMA
121static inline int dma_get_cache_alignment(void)
122{
123#ifdef ARCH_DMA_MINALIGN
124 return ARCH_DMA_MINALIGN;
125#endif
126 return 1;
127}
128#endif
129
130/* flags for the coherent memory api */
131#define DMA_MEMORY_MAP 0x01
132#define DMA_MEMORY_IO 0x02
133#define DMA_MEMORY_INCLUDES_CHILDREN 0x04
134#define DMA_MEMORY_EXCLUSIVE 0x08
135
136#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
137static inline int
138dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
139 dma_addr_t device_addr, size_t size, int flags)
140{
141 return 0;
142}
143
144static inline void
145dma_release_declared_memory(struct device *dev)
146{
147}
148
149static inline void *
150dma_mark_declared_memory_occupied(struct device *dev,
151 dma_addr_t device_addr, size_t size)
152{
153 return ERR_PTR(-EBUSY);
154}
155#endif
156
157/*
158 * Managed DMA API
159 */
160extern void *dmam_alloc_coherent(struct device *dev, size_t size,
161 dma_addr_t *dma_handle, gfp_t gfp);
162extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
163 dma_addr_t dma_handle);
164extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
165 dma_addr_t *dma_handle, gfp_t gfp);
166extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
167 dma_addr_t dma_handle);
168#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
169extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
170 dma_addr_t device_addr, size_t size,
171 int flags);
172extern void dmam_release_declared_memory(struct device *dev);
173#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
174static inline int dmam_declare_coherent_memory(struct device *dev,
175 dma_addr_t bus_addr, dma_addr_t device_addr,
176 size_t size, gfp_t gfp)
177{
178 return 0;
179}
180
181static inline void dmam_release_declared_memory(struct device *dev)
182{
183}
184#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
185
186#ifndef CONFIG_HAVE_DMA_ATTRS
187struct dma_attrs;
188
189#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
190 dma_map_single(dev, cpu_addr, size, dir)
191
192#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
193 dma_unmap_single(dev, dma_addr, size, dir)
194
195#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
196 dma_map_sg(dev, sgl, nents, dir)
197
198#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
199 dma_unmap_sg(dev, sgl, nents, dir)
200
201#endif /* CONFIG_HAVE_DMA_ATTRS */
202
203#ifdef CONFIG_NEED_DMA_MAP_STATE
204#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
205#define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
206#define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
207#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
208#define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
209#define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
210#else
211#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
212#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
213#define dma_unmap_addr(PTR, ADDR_NAME) (0)
214#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
215#define dma_unmap_len(PTR, LEN_NAME) (0)
216#define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
217#endif
218
219#endif