Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
dma-mapping.h
Go to the documentation of this file.
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 
11 struct 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  int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
22  dma_addr_t, size_t, struct dma_attrs *attrs);
23 
24  dma_addr_t (*map_page)(struct device *dev, struct page *page,
25  unsigned long offset, size_t size,
26  enum dma_data_direction dir,
27  struct dma_attrs *attrs);
28  void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
29  size_t size, enum dma_data_direction dir,
30  struct dma_attrs *attrs);
31  int (*map_sg)(struct device *dev, struct scatterlist *sg,
32  int nents, enum dma_data_direction dir,
33  struct dma_attrs *attrs);
34  void (*unmap_sg)(struct device *dev,
35  struct scatterlist *sg, int nents,
36  enum dma_data_direction dir,
37  struct dma_attrs *attrs);
38  void (*sync_single_for_cpu)(struct device *dev,
39  dma_addr_t dma_handle, size_t size,
40  enum dma_data_direction dir);
41  void (*sync_single_for_device)(struct device *dev,
42  dma_addr_t dma_handle, size_t size,
43  enum dma_data_direction dir);
44  void (*sync_sg_for_cpu)(struct device *dev,
45  struct scatterlist *sg, int nents,
46  enum dma_data_direction dir);
47  void (*sync_sg_for_device)(struct device *dev,
48  struct scatterlist *sg, int nents,
49  enum dma_data_direction dir);
50  int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
51  int (*dma_supported)(struct device *dev, u64 mask);
52  int (*set_dma_mask)(struct device *dev, u64 mask);
53 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
54  u64 (*get_required_mask)(struct device *dev);
55 #endif
56  int is_phys;
57 };
58 
59 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
60 
61 #define DMA_MASK_NONE 0x0ULL
62 
63 static inline int valid_dma_direction(int dma_direction)
64 {
65  return ((dma_direction == DMA_BIDIRECTIONAL) ||
66  (dma_direction == DMA_TO_DEVICE) ||
67  (dma_direction == DMA_FROM_DEVICE));
68 }
69 
70 static inline int is_device_dma_capable(struct device *dev)
71 {
72  return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
73 }
74 
75 #ifdef CONFIG_HAS_DMA
76 #include <asm/dma-mapping.h>
77 #else
78 #include <asm-generic/dma-mapping-broken.h>
79 #endif
80 
81 static inline u64 dma_get_mask(struct device *dev)
82 {
83  if (dev && dev->dma_mask && *dev->dma_mask)
84  return *dev->dma_mask;
85  return DMA_BIT_MASK(32);
86 }
87 
88 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
89 int dma_set_coherent_mask(struct device *dev, u64 mask);
90 #else
91 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
92 {
93  if (!dma_supported(dev, mask))
94  return -EIO;
95  dev->coherent_dma_mask = mask;
96  return 0;
97 }
98 #endif
99 
100 extern u64 dma_get_required_mask(struct device *dev);
101 
102 static inline unsigned int dma_get_max_seg_size(struct device *dev)
103 {
104  return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
105 }
106 
107 static inline unsigned int dma_set_max_seg_size(struct device *dev,
108  unsigned int size)
109 {
110  if (dev->dma_parms) {
111  dev->dma_parms->max_segment_size = size;
112  return 0;
113  } else
114  return -EIO;
115 }
116 
117 static inline unsigned long dma_get_seg_boundary(struct device *dev)
118 {
119  return dev->dma_parms ?
120  dev->dma_parms->segment_boundary_mask : 0xffffffff;
121 }
122 
123 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
124 {
125  if (dev->dma_parms) {
126  dev->dma_parms->segment_boundary_mask = mask;
127  return 0;
128  } else
129  return -EIO;
130 }
131 
132 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
133  dma_addr_t *dma_handle, gfp_t flag)
134 {
135  void *ret = dma_alloc_coherent(dev, size, dma_handle, flag);
136  if (ret)
137  memset(ret, 0, size);
138  return ret;
139 }
140 
141 #ifdef CONFIG_HAS_DMA
142 static inline int dma_get_cache_alignment(void)
143 {
144 #ifdef ARCH_DMA_MINALIGN
145  return ARCH_DMA_MINALIGN;
146 #endif
147  return 1;
148 }
149 #endif
150 
151 /* flags for the coherent memory api */
152 #define DMA_MEMORY_MAP 0x01
153 #define DMA_MEMORY_IO 0x02
154 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
155 #define DMA_MEMORY_EXCLUSIVE 0x08
156 
157 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
158 static inline int
159 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
160  dma_addr_t device_addr, size_t size, int flags)
161 {
162  return 0;
163 }
164 
165 static inline void
166 dma_release_declared_memory(struct device *dev)
167 {
168 }
169 
170 static inline void *
171 dma_mark_declared_memory_occupied(struct device *dev,
172  dma_addr_t device_addr, size_t size)
173 {
174  return ERR_PTR(-EBUSY);
175 }
176 #endif
177 
178 /*
179  * Managed DMA API
180  */
181 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
182  dma_addr_t *dma_handle, gfp_t gfp);
183 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
184  dma_addr_t dma_handle);
185 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
186  dma_addr_t *dma_handle, gfp_t gfp);
187 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
188  dma_addr_t dma_handle);
189 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
190 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
191  dma_addr_t device_addr, size_t size,
192  int flags);
193 extern void dmam_release_declared_memory(struct device *dev);
194 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
195 static inline int dmam_declare_coherent_memory(struct device *dev,
196  dma_addr_t bus_addr, dma_addr_t device_addr,
197  size_t size, gfp_t gfp)
198 {
199  return 0;
200 }
201 
202 static inline void dmam_release_declared_memory(struct device *dev)
203 {
204 }
205 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
206 
207 #ifndef CONFIG_HAVE_DMA_ATTRS
208 struct dma_attrs;
209 
210 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
211  dma_map_single(dev, cpu_addr, size, dir)
212 
213 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
214  dma_unmap_single(dev, dma_addr, size, dir)
215 
216 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
217  dma_map_sg(dev, sgl, nents, dir)
218 
219 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
220  dma_unmap_sg(dev, sgl, nents, dir)
221 
222 #endif /* CONFIG_HAVE_DMA_ATTRS */
223 
224 #ifdef CONFIG_NEED_DMA_MAP_STATE
225 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
226 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
227 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
228 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
229 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
230 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
231 #else
232 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
233 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
234 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
235 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
236 #define dma_unmap_len(PTR, LEN_NAME) (0)
237 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
238 #endif
239 
240 #endif
Generated on Thu Jan 10 2013 12:49:28 for Linux Kernel by   doxygen 1.8.2