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 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
63static 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
70static 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
81static 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
89int dma_set_coherent_mask(struct device *dev, u64 mask);
90#else
91static 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/*
101 * Set both the DMA mask and the coherent DMA mask to the same thing.
102 * Note that we don't check the return value from dma_set_coherent_mask()
103 * as the DMA API guarantees that the coherent DMA mask can be set to
104 * the same or smaller than the streaming DMA mask.
105 */
106static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
107{
108 int rc = dma_set_mask(dev, mask);
109 if (rc == 0)
110 dma_set_coherent_mask(dev, mask);
111 return rc;
112}
113
114/*
115 * Similar to the above, except it deals with the case where the device
116 * does not have dev->dma_mask appropriately setup.
117 */
118static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
119{
120 dev->dma_mask = &dev->coherent_dma_mask;
121 return dma_set_mask_and_coherent(dev, mask);
122}
123
124extern u64 dma_get_required_mask(struct device *dev);
125
126static inline unsigned int dma_get_max_seg_size(struct device *dev)
127{
128 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
129}
130
131static inline unsigned int dma_set_max_seg_size(struct device *dev,
132 unsigned int size)
133{
134 if (dev->dma_parms) {
135 dev->dma_parms->max_segment_size = size;
136 return 0;
137 } else
138 return -EIO;
139}
140
141static inline unsigned long dma_get_seg_boundary(struct device *dev)
142{
143 return dev->dma_parms ?
144 dev->dma_parms->segment_boundary_mask : 0xffffffff;
145}
146
147static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
148{
149 if (dev->dma_parms) {
150 dev->dma_parms->segment_boundary_mask = mask;
151 return 0;
152 } else
153 return -EIO;
154}
155
156#ifndef dma_max_pfn
157static inline unsigned long dma_max_pfn(struct device *dev)
158{
159 return *dev->dma_mask >> PAGE_SHIFT;
160}
161#endif
162
163static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
164 dma_addr_t *dma_handle, gfp_t flag)
165{
166 void *ret = dma_alloc_coherent(dev, size, dma_handle,
167 flag | __GFP_ZERO);
168 return ret;
169}
170
171#ifdef CONFIG_HAS_DMA
172static inline int dma_get_cache_alignment(void)
173{
174#ifdef ARCH_DMA_MINALIGN
175 return ARCH_DMA_MINALIGN;
176#endif
177 return 1;
178}
179#endif
180
181/* flags for the coherent memory api */
182#define DMA_MEMORY_MAP 0x01
183#define DMA_MEMORY_IO 0x02
184#define DMA_MEMORY_INCLUDES_CHILDREN 0x04
185#define DMA_MEMORY_EXCLUSIVE 0x08
186
187#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
188static inline int
189dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
190 dma_addr_t device_addr, size_t size, int flags)
191{
192 return 0;
193}
194
195static inline void
196dma_release_declared_memory(struct device *dev)
197{
198}
199
200static inline void *
201dma_mark_declared_memory_occupied(struct device *dev,
202 dma_addr_t device_addr, size_t size)
203{
204 return ERR_PTR(-EBUSY);
205}
206#endif
207
208/*
209 * Managed DMA API
210 */
211extern void *dmam_alloc_coherent(struct device *dev, size_t size,
212 dma_addr_t *dma_handle, gfp_t gfp);
213extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
214 dma_addr_t dma_handle);
215extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
216 dma_addr_t *dma_handle, gfp_t gfp);
217extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
218 dma_addr_t dma_handle);
219#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
220extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
221 dma_addr_t device_addr, size_t size,
222 int flags);
223extern void dmam_release_declared_memory(struct device *dev);
224#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
225static inline int dmam_declare_coherent_memory(struct device *dev,
226 dma_addr_t bus_addr, dma_addr_t device_addr,
227 size_t size, gfp_t gfp)
228{
229 return 0;
230}
231
232static inline void dmam_release_declared_memory(struct device *dev)
233{
234}
235#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
236
237#ifndef CONFIG_HAVE_DMA_ATTRS
238struct dma_attrs;
239
240#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
241 dma_map_single(dev, cpu_addr, size, dir)
242
243#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
244 dma_unmap_single(dev, dma_addr, size, dir)
245
246#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
247 dma_map_sg(dev, sgl, nents, dir)
248
249#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
250 dma_unmap_sg(dev, sgl, nents, dir)
251
252#endif /* CONFIG_HAVE_DMA_ATTRS */
253
254#ifdef CONFIG_NEED_DMA_MAP_STATE
255#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
256#define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
257#define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
258#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
259#define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
260#define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
261#else
262#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
263#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
264#define dma_unmap_addr(PTR, ADDR_NAME) (0)
265#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
266#define dma_unmap_len(PTR, LEN_NAME) (0)
267#define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
268#endif
269
270#endif