aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-x86/dma-mapping.h
blob: a1a4dc7fe6ece75087cc33e33d3c60e2477cd586 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
#ifndef _ASM_DMA_MAPPING_H_
#define _ASM_DMA_MAPPING_H_

/*
 * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
 * documentation.
 */

#include <linux/scatterlist.h>
#include <asm/io.h>
#include <asm/swiotlb.h>

extern dma_addr_t bad_dma_address;
extern int iommu_merge;
extern struct device fallback_dev;
extern int panic_on_overflow;
extern int forbid_dac;
extern int force_iommu;

struct dma_mapping_ops {
	int             (*mapping_error)(dma_addr_t dma_addr);
	void*           (*alloc_coherent)(struct device *dev, size_t size,
				dma_addr_t *dma_handle, gfp_t gfp);
	void            (*free_coherent)(struct device *dev, size_t size,
				void *vaddr, dma_addr_t dma_handle);
	dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
				size_t size, int direction);
	/* like map_single, but doesn't check the device mask */
	dma_addr_t      (*map_simple)(struct device *hwdev, phys_addr_t ptr,
				size_t size, int direction);
	void            (*unmap_single)(struct device *dev, dma_addr_t addr,
				size_t size, int direction);
	void            (*sync_single_for_cpu)(struct device *hwdev,
				dma_addr_t dma_handle, size_t size,
				int direction);
	void            (*sync_single_for_device)(struct device *hwdev,
				dma_addr_t dma_handle, size_t size,
				int direction);
	void            (*sync_single_range_for_cpu)(struct device *hwdev,
				dma_addr_t dma_handle, unsigned long offset,
				size_t size, int direction);
	void            (*sync_single_range_for_device)(struct device *hwdev,
				dma_addr_t dma_handle, unsigned long offset,
				size_t size, int direction);
	void            (*sync_sg_for_cpu)(struct device *hwdev,
				struct scatterlist *sg, int nelems,
				int direction);
	void            (*sync_sg_for_device)(struct device *hwdev,
				struct scatterlist *sg, int nelems,
				int direction);
	int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
				int nents, int direction);
	void            (*unmap_sg)(struct device *hwdev,
				struct scatterlist *sg, int nents,
				int direction);
	int             (*dma_supported)(struct device *hwdev, u64 mask);
	int		is_phys;
};

extern const struct dma_mapping_ops *dma_ops;

static inline int dma_mapping_error(dma_addr_t dma_addr)
{
	if (dma_ops->mapping_error)
		return dma_ops->mapping_error(dma_addr);

	return (dma_addr == bad_dma_address);
}

#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)

void *dma_alloc_coherent(struct device *dev, size_t size,
			   dma_addr_t *dma_handle, gfp_t flag);

void dma_free_coherent(struct device *dev, size_t size,
			 void *vaddr, dma_addr_t dma_handle);


extern int dma_supported(struct device *hwdev, u64 mask);
extern int dma_set_mask(struct device *dev, u64 mask);

static inline dma_addr_t
dma_map_single(struct device *hwdev, void *ptr, size_t size,
	       int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
}

static inline void
dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
		 int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	if (dma_ops->unmap_single)
		dma_ops->unmap_single(dev, addr, size, direction);
}

static inline int
dma_map_sg(struct device *hwdev, struct scatterlist *sg,
	   int nents, int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	return dma_ops->map_sg(hwdev, sg, nents, direction);
}

static inline void
dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
	     int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	if (dma_ops->unmap_sg)
		dma_ops->unmap_sg(hwdev, sg, nents, direction);
}

static inline void
dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
			size_t size, int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	if (dma_ops->sync_single_for_cpu)
		dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
					     direction);
	flush_write_buffers();
}

static inline void
dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
			   size_t size, int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	if (dma_ops->sync_single_for_device)
		dma_ops->sync_single_for_device(hwdev, dma_handle, size,
						direction);
	flush_write_buffers();
}

static inline void
dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
			      unsigned long offset, size_t size, int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	if (dma_ops->sync_single_range_for_cpu)
		dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
						   size, direction);

	flush_write_buffers();
}

static inline void
dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
				 unsigned long offset, size_t size,
				 int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	if (dma_ops->sync_single_range_for_device)
		dma_ops->sync_single_range_for_device(hwdev, dma_handle,
						      offset, size, direction);

	flush_write_buffers();
}

static inline void
dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
		    int nelems, int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	if (dma_ops->sync_sg_for_cpu)
		dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
	flush_write_buffers();
}

static inline void
dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
		       int nelems, int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	if (dma_ops->sync_sg_for_device)
		dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);

	flush_write_buffers();
}

static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
				      size_t offset, size_t size,
				      int direction)
{
	BUG_ON(!valid_dma_direction(direction));
	return dma_ops->map_single(dev, page_to_phys(page)+offset,
				   size, direction);
}

static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
				  size_t size, int direction)
{
	dma_unmap_single(dev, addr, size, direction);
}

static inline void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
	enum dma_data_direction dir)
{
	flush_write_buffers();
}

static inline int dma_get_cache_alignment(void)
{
	/* no easy way to get cache size on all x86, so return the
	 * maximum possible, to be safe */
	return boot_cpu_data.x86_clflush_size;
}

#define dma_is_consistent(d, h)	(1)

#ifdef CONFIG_X86_32
#  define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
struct dma_coherent_mem {
	void		*virt_base;
	u32		device_base;
	int		size;
	int		flags;
	unsigned long	*bitmap;
};

extern int
dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
			    dma_addr_t device_addr, size_t size, int flags);

extern void
dma_release_declared_memory(struct device *dev);

extern void *
dma_mark_declared_memory_occupied(struct device *dev,
				  dma_addr_t device_addr, size_t size);
#endif /* CONFIG_X86_32 */
#endif