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
|
/*
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_DMA_MAPPING_H
#define __ASM_DMA_MAPPING_H
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/vmalloc.h>
#include <asm-generic/dma-coherent.h>
#include <xen/xen.h>
#include <asm/xen/hypervisor.h>
#define DMA_ERROR_CODE (~(dma_addr_t)0)
extern struct dma_map_ops *dma_ops;
extern struct dma_map_ops coherent_swiotlb_dma_ops;
extern struct dma_map_ops noncoherent_swiotlb_dma_ops;
static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
{
if (unlikely(!dev) || !dev->archdata.dma_ops)
return dma_ops;
else
return dev->archdata.dma_ops;
}
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
if (xen_initial_domain())
return xen_dma_ops;
else
return __generic_dma_ops(dev);
}
static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
{
dev->archdata.dma_ops = ops;
}
static inline int set_arch_dma_coherent_ops(struct device *dev)
{
dev->archdata.dma_coherent = true;
set_dma_ops(dev, &coherent_swiotlb_dma_ops);
return 0;
}
#define set_arch_dma_coherent_ops set_arch_dma_coherent_ops
/* do not use this function in a driver */
static inline bool is_device_dma_coherent(struct device *dev)
{
return dev->archdata.dma_coherent;
}
#include <asm-generic/dma-mapping-common.h>
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
return (dma_addr_t)paddr;
}
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
{
return (phys_addr_t)dev_addr;
}
static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
{
struct dma_map_ops *ops = get_dma_ops(dev);
debug_dma_mapping_error(dev, dev_addr);
return ops->mapping_error(dev, dev_addr);
}
static inline int dma_supported(struct device *dev, u64 mask)
{
struct dma_map_ops *ops = get_dma_ops(dev);
return ops->dma_supported(dev, mask);
}
static inline int dma_set_mask(struct device *dev, u64 mask)
{
if (!dev->dma_mask || !dma_supported(dev, mask))
return -EIO;
*dev->dma_mask = mask;
return 0;
}
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
if (!dev->dma_mask)
return 0;
return addr + size - 1 <= *dev->dma_mask;
}
static inline void dma_mark_clean(void *addr, size_t size)
{
}
#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
#define dma_free_coherent(d, s, h, f) dma_free_attrs(d, s, h, f, NULL)
static inline void *dma_alloc_attrs(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
struct dma_attrs *attrs)
{
struct dma_map_ops *ops = get_dma_ops(dev);
void *vaddr;
if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
return vaddr;
vaddr = ops->alloc(dev, size, dma_handle, flags, attrs);
debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
return vaddr;
}
static inline void dma_free_attrs(struct device *dev, size_t size,
void *vaddr, dma_addr_t dev_addr,
struct dma_attrs *attrs)
{
struct dma_map_ops *ops = get_dma_ops(dev);
if (dma_release_from_coherent(dev, get_order(size), vaddr))
return;
debug_dma_free_coherent(dev, size, vaddr, dev_addr);
ops->free(dev, size, vaddr, dev_addr, attrs);
}
/*
* There is no dma_cache_sync() implementation, so just return NULL here.
*/
static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t flags)
{
return NULL;
}
static inline void dma_free_noncoherent(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t handle)
{
}
#endif /* __KERNEL__ */
#endif /* __ASM_DMA_MAPPING_H */
|
