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/scatterlist.h>
8
9/* These definitions mirror those in pci.h, so they can be used
10 * interchangeably with their PCI_ counterparts */
11enum dma_data_direction {
12 DMA_BIDIRECTIONAL = 0,
13 DMA_TO_DEVICE = 1,
14 DMA_FROM_DEVICE = 2,
15 DMA_NONE = 3,
16};
17
18struct dma_map_ops {
19 void* (*alloc_coherent)(struct device *dev, size_t size,
20 dma_addr_t *dma_handle, gfp_t gfp);
21 void (*free_coherent)(struct device *dev, size_t size,
22 void *vaddr, dma_addr_t dma_handle);
23 dma_addr_t (*map_page)(struct device *dev, struct page *page,
24 unsigned long offset, size_t size,
25 enum dma_data_direction dir,
26 struct dma_attrs *attrs);
27 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
28 size_t size, enum dma_data_direction dir,
29 struct dma_attrs *attrs);
30 int (*map_sg)(struct device *dev, struct scatterlist *sg,
31 int nents, enum dma_data_direction dir,
32 struct dma_attrs *attrs);
33 void (*unmap_sg)(struct device *dev,
34 struct scatterlist *sg, int nents,
35 enum dma_data_direction dir,
36 struct dma_attrs *attrs);
37 void (*sync_single_for_cpu)(struct device *dev,
38 dma_addr_t dma_handle, size_t size,
39 enum dma_data_direction dir);
40 void (*sync_single_for_device)(struct device *dev,
41 dma_addr_t dma_handle, size_t size,
42 enum dma_data_direction dir);
43 void (*sync_single_range_for_cpu)(struct device *dev,
44 dma_addr_t dma_handle,
45 unsigned long offset,
46 size_t size,
47 enum dma_data_direction dir);
48 void (*sync_single_range_for_device)(struct device *dev,
49 dma_addr_t dma_handle,
50 unsigned long offset,
51 size_t size,
52 enum dma_data_direction dir);
53 void (*sync_sg_for_cpu)(struct device *dev,
54 struct scatterlist *sg, int nents,
55 enum dma_data_direction dir);
56 void (*sync_sg_for_device)(struct device *dev,
57 struct scatterlist *sg, int nents,
58 enum dma_data_direction dir);
59 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
60 int (*dma_supported)(struct device *dev, u64 mask);
61 int is_phys;
62};
63
64#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
65
66/*
67 * NOTE: do not use the below macros in new code and do not add new definitions
68 * here.
69 *
70 * Instead, just open-code DMA_BIT_MASK(n) within your driver
71 */
72#define DMA_64BIT_MASK DMA_BIT_MASK(64)
73#define DMA_48BIT_MASK DMA_BIT_MASK(48)
74#define DMA_47BIT_MASK DMA_BIT_MASK(47)
75#define DMA_40BIT_MASK DMA_BIT_MASK(40)
76#define DMA_39BIT_MASK DMA_BIT_MASK(39)
77#define DMA_35BIT_MASK DMA_BIT_MASK(35)
78#define DMA_32BIT_MASK DMA_BIT_MASK(32)
79#define DMA_31BIT_MASK DMA_BIT_MASK(31)
80#define DMA_30BIT_MASK DMA_BIT_MASK(30)
81#define DMA_29BIT_MASK DMA_BIT_MASK(29)
82#define DMA_28BIT_MASK DMA_BIT_MASK(28)
83#define DMA_24BIT_MASK DMA_BIT_MASK(24)
84
85#define DMA_MASK_NONE 0x0ULL
86
87static inline int valid_dma_direction(int dma_direction)
88{
89 return ((dma_direction == DMA_BIDIRECTIONAL) ||
90 (dma_direction == DMA_TO_DEVICE) ||
91 (dma_direction == DMA_FROM_DEVICE));
92}
93
94static inline int is_device_dma_capable(struct device *dev)
95{
96 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
97}
98
99static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
100{
101 return addr + size <= mask;
102}
103
104#ifdef CONFIG_HAS_DMA
105#include <asm/dma-mapping.h>
106#else
107#include <asm-generic/dma-mapping-broken.h>
108#endif
109
110/* Backwards compat, remove in 2.7.x */
111#define dma_sync_single dma_sync_single_for_cpu
112#define dma_sync_sg dma_sync_sg_for_cpu
113
114static inline u64 dma_get_mask(struct device *dev)
115{
116 if (dev && dev->dma_mask && *dev->dma_mask)
117 return *dev->dma_mask;
118 return DMA_BIT_MASK(32);
119}
120
121extern u64 dma_get_required_mask(struct device *dev);
122
123static inline unsigned int dma_get_max_seg_size(struct device *dev)
124{
125 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
126}
127
128static inline unsigned int dma_set_max_seg_size(struct device *dev,
129 unsigned int size)
130{
131 if (dev->dma_parms) {
132 dev->dma_parms->max_segment_size = size;
133 return 0;
134 } else
135 return -EIO;
136}
137
138static inline unsigned long dma_get_seg_boundary(struct device *dev)
139{
140 return dev->dma_parms ?
141 dev->dma_parms->segment_boundary_mask : 0xffffffff;
142}
143
144static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
145{
146 if (dev->dma_parms) {
147 dev->dma_parms->segment_boundary_mask = mask;
148 return 0;
149 } else
150 return -EIO;
151}
152
153/* flags for the coherent memory api */
154#define DMA_MEMORY_MAP 0x01
155#define DMA_MEMORY_IO 0x02
156#define DMA_MEMORY_INCLUDES_CHILDREN 0x04
157#define DMA_MEMORY_EXCLUSIVE 0x08
158
159#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
160static inline int
161dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
162 dma_addr_t device_addr, size_t size, int flags)
163{
164 return 0;
165}
166
167static inline void
168dma_release_declared_memory(struct device *dev)
169{
170}
171
172static inline void *
173dma_mark_declared_memory_occupied(struct device *dev,
174 dma_addr_t device_addr, size_t size)
175{
176 return ERR_PTR(-EBUSY);
177}
178#endif
179
180/*
181 * Managed DMA API
182 */
183extern void *dmam_alloc_coherent(struct device *dev, size_t size,
184 dma_addr_t *dma_handle, gfp_t gfp);
185extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
186 dma_addr_t dma_handle);
187extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
188 dma_addr_t *dma_handle, gfp_t gfp);
189extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
190 dma_addr_t dma_handle);
191#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
192extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
193 dma_addr_t device_addr, size_t size,
194 int flags);
195extern void dmam_release_declared_memory(struct device *dev);
196#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
197static inline int dmam_declare_coherent_memory(struct device *dev,
198 dma_addr_t bus_addr, dma_addr_t device_addr,
199 size_t size, gfp_t gfp)
200{
201 return 0;
202}
203
204static inline void dmam_release_declared_memory(struct device *dev)
205{
206}
207#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
208
209#ifndef CONFIG_HAVE_DMA_ATTRS
210struct dma_attrs;
211
212#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
213 dma_map_single(dev, cpu_addr, size, dir)
214
215#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
216 dma_unmap_single(dev, dma_addr, size, dir)
217
218#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
219 dma_map_sg(dev, sgl, nents, dir)
220
221#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
222 dma_unmap_sg(dev, sgl, nents, dir)
223
224#endif /* CONFIG_HAVE_DMA_ATTRS */
225
226#endif