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10#include <linux/dma-mapping.h>
11#include <linux/export.h>
12#include <linux/gfp.h>
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16
17struct dma_devres {
18 size_t size;
19 void *vaddr;
20 dma_addr_t dma_handle;
21};
22
23static void dmam_coherent_release(struct device *dev, void *res)
24{
25 struct dma_devres *this = res;
26
27 dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle);
28}
29
30static void dmam_noncoherent_release(struct device *dev, void *res)
31{
32 struct dma_devres *this = res;
33
34 dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle);
35}
36
37static int dmam_match(struct device *dev, void *res, void *match_data)
38{
39 struct dma_devres *this = res, *match = match_data;
40
41 if (this->vaddr == match->vaddr) {
42 WARN_ON(this->size != match->size ||
43 this->dma_handle != match->dma_handle);
44 return 1;
45 }
46 return 0;
47}
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62void * dmam_alloc_coherent(struct device *dev, size_t size,
63 dma_addr_t *dma_handle, gfp_t gfp)
64{
65 struct dma_devres *dr;
66 void *vaddr;
67
68 dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp);
69 if (!dr)
70 return NULL;
71
72 vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp);
73 if (!vaddr) {
74 devres_free(dr);
75 return NULL;
76 }
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78 dr->vaddr = vaddr;
79 dr->dma_handle = *dma_handle;
80 dr->size = size;
81
82 devres_add(dev, dr);
83
84 return vaddr;
85}
86EXPORT_SYMBOL(dmam_alloc_coherent);
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97void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
98 dma_addr_t dma_handle)
99{
100 struct dma_devres match_data = { size, vaddr, dma_handle };
101
102 dma_free_coherent(dev, size, vaddr, dma_handle);
103 WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match,
104 &match_data));
105}
106EXPORT_SYMBOL(dmam_free_coherent);
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121void *dmam_alloc_noncoherent(struct device *dev, size_t size,
122 dma_addr_t *dma_handle, gfp_t gfp)
123{
124 struct dma_devres *dr;
125 void *vaddr;
126
127 dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp);
128 if (!dr)
129 return NULL;
130
131 vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
132 if (!vaddr) {
133 devres_free(dr);
134 return NULL;
135 }
136
137 dr->vaddr = vaddr;
138 dr->dma_handle = *dma_handle;
139 dr->size = size;
140
141 devres_add(dev, dr);
142
143 return vaddr;
144}
145EXPORT_SYMBOL(dmam_alloc_noncoherent);
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156void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
157 dma_addr_t dma_handle)
158{
159 struct dma_devres match_data = { size, vaddr, dma_handle };
160
161 dma_free_noncoherent(dev, size, vaddr, dma_handle);
162 WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match,
163 &match_data));
164}
165EXPORT_SYMBOL(dmam_free_noncoherent);
166
167#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
168
169static void dmam_coherent_decl_release(struct device *dev, void *res)
170{
171 dma_release_declared_memory(dev);
172}
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187int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
188 dma_addr_t device_addr, size_t size, int flags)
189{
190 void *res;
191 int rc;
192
193 res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL);
194 if (!res)
195 return -ENOMEM;
196
197 rc = dma_declare_coherent_memory(dev, bus_addr, device_addr, size,
198 flags);
199 if (rc == 0)
200 devres_add(dev, res);
201 else
202 devres_free(res);
203
204 return rc;
205}
206EXPORT_SYMBOL(dmam_declare_coherent_memory);
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214void dmam_release_declared_memory(struct device *dev)
215{
216 WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL));
217}
218EXPORT_SYMBOL(dmam_release_declared_memory);
219
220#endif
221