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/string.h>
5#include <linux/device.h>
6#include <linux/err.h>
7#include <linux/dma-attrs.h>
8#include <linux/dma-direction.h>
9#include <linux/scatterlist.h>
10
11struct dma_map_ops {
12 void* (*alloc)(struct device *dev, size_t size,
13 dma_addr_t *dma_handle, gfp_t gfp,
14 struct dma_attrs *attrs);
15 void (*free)(struct device *dev, size_t size,
16 void *vaddr, dma_addr_t dma_handle,
17 struct dma_attrs *attrs);
18 int (*mmap)(struct device *, struct vm_area_struct *,
19 void *, dma_addr_t, size_t, struct dma_attrs *attrs);
20
21 dma_addr_t (*map_page)(struct device *dev, struct page *page,
22 unsigned long offset, size_t size,
23 enum dma_data_direction dir,
24 struct dma_attrs *attrs);
25 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
26 size_t size, enum dma_data_direction dir,
27 struct dma_attrs *attrs);
28 int (*map_sg)(struct device *dev, struct scatterlist *sg,
29 int nents, enum dma_data_direction dir,
30 struct dma_attrs *attrs);
31 void (*unmap_sg)(struct device *dev,
32 struct scatterlist *sg, int nents,
33 enum dma_data_direction dir,
34 struct dma_attrs *attrs);
35 void (*sync_single_for_cpu)(struct device *dev,
36 dma_addr_t dma_handle, size_t size,
37 enum dma_data_direction dir);
38 void (*sync_single_for_device)(struct device *dev,
39 dma_addr_t dma_handle, size_t size,
40 enum dma_data_direction dir);
41 void (*sync_sg_for_cpu)(struct device *dev,
42 struct scatterlist *sg, int nents,
43 enum dma_data_direction dir);
44 void (*sync_sg_for_device)(struct device *dev,
45 struct scatterlist *sg, int nents,
46 enum dma_data_direction dir);
47 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
48 int (*dma_supported)(struct device *dev, u64 mask);
49 int (*set_dma_mask)(struct device *dev, u64 mask);
50#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
51 u64 (*get_required_mask)(struct device *dev);
52#endif
53 int is_phys;
54};
55
56#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
57
58#define DMA_MASK_NONE 0x0ULL
59
60static inline int valid_dma_direction(int dma_direction)
61{
62 return ((dma_direction == DMA_BIDIRECTIONAL) ||
63 (dma_direction == DMA_TO_DEVICE) ||
64 (dma_direction == DMA_FROM_DEVICE));
65}
66
67static inline int is_device_dma_capable(struct device *dev)
68{
69 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
70}
71
72#ifdef CONFIG_HAS_DMA
73#include <asm/dma-mapping.h>
74#else
75#include <asm-generic/dma-mapping-broken.h>
76#endif
77
78static inline u64 dma_get_mask(struct device *dev)
79{
80 if (dev && dev->dma_mask && *dev->dma_mask)
81 return *dev->dma_mask;
82 return DMA_BIT_MASK(32);
83}
84
85#ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
86int dma_set_coherent_mask(struct device *dev, u64 mask);
87#else
88static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
89{
90 if (!dma_supported(dev, mask))
91 return -EIO;
92 dev->coherent_dma_mask = mask;
93 return 0;
94}
95#endif
96
97extern u64 dma_get_required_mask(struct device *dev);
98
99static inline unsigned int dma_get_max_seg_size(struct device *dev)
100{
101 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
102}
103
104static inline unsigned int dma_set_max_seg_size(struct device *dev,
105 unsigned int size)
106{
107 if (dev->dma_parms) {
108 dev->dma_parms->max_segment_size = size;
109 return 0;
110 } else
111 return -EIO;
112}
113
114static inline unsigned long dma_get_seg_boundary(struct device *dev)
115{
116 return dev->dma_parms ?
117 dev->dma_parms->segment_boundary_mask : 0xffffffff;
118}
119
120static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
121{
122 if (dev->dma_parms) {
123 dev->dma_parms->segment_boundary_mask = mask;
124 return 0;
125 } else
126 return -EIO;
127}
128
129static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
130 dma_addr_t *dma_handle, gfp_t flag)
131{
132 void *ret = dma_alloc_coherent(dev, size, dma_handle, flag);
133 if (ret)
134 memset(ret, 0, size);
135 return ret;
136}
137
138#ifdef CONFIG_HAS_DMA
139static inline int dma_get_cache_alignment(void)
140{
141#ifdef ARCH_DMA_MINALIGN
142 return ARCH_DMA_MINALIGN;
143#endif
144 return 1;
145}
146#endif
147
148/* flags for the coherent memory api */
149#define DMA_MEMORY_MAP 0x01
150#define DMA_MEMORY_IO 0x02
151#define DMA_MEMORY_INCLUDES_CHILDREN 0x04
152#define DMA_MEMORY_EXCLUSIVE 0x08
153
154#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
155static inline int
156dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
157 dma_addr_t device_addr, size_t size, int flags)
158{
159 return 0;
160}
161
162static inline void
163dma_release_declared_memory(struct device *dev)
164{
165}
166
167static inline void *
168dma_mark_declared_memory_occupied(struct device *dev,
169 dma_addr_t device_addr, size_t size)
170{
171 return ERR_PTR(-EBUSY);
172}
173#endif
174
175/*
176 * Managed DMA API
177 */
178extern void *dmam_alloc_coherent(struct device *dev, size_t size,
179 dma_addr_t *dma_handle, gfp_t gfp);
180extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
181 dma_addr_t dma_handle);
182extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
183 dma_addr_t *dma_handle, gfp_t gfp);
184extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
185 dma_addr_t dma_handle);
186#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
187extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
188 dma_addr_t device_addr, size_t size,
189 int flags);
190extern void dmam_release_declared_memory(struct device *dev);
191#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
192static inline int dmam_declare_coherent_memory(struct device *dev,
193 dma_addr_t bus_addr, dma_addr_t device_addr,
194 size_t size, gfp_t gfp)
195{
196 return 0;
197}
198
199static inline void dmam_release_declared_memory(struct device *dev)
200{
201}
202#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
203
204#ifndef CONFIG_HAVE_DMA_ATTRS
205struct dma_attrs;
206
207#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
208 dma_map_single(dev, cpu_addr, size, dir)
209
210#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
211 dma_unmap_single(dev, dma_addr, size, dir)
212
213#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
214 dma_map_sg(dev, sgl, nents, dir)
215
216#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
217 dma_unmap_sg(dev, sgl, nents, dir)
218
219#endif /* CONFIG_HAVE_DMA_ATTRS */
220
221#ifdef CONFIG_NEED_DMA_MAP_STATE
222#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
223#define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
224#define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
225#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
226#define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
227#define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
228#else
229#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
230#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
231#define dma_unmap_addr(PTR, ADDR_NAME) (0)
232#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
233#define dma_unmap_len(PTR, LEN_NAME) (0)
234#define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
235#endif
236
237#endif