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1/*
2 * drivers/base/dma-mapping.c - arch-independent dma-mapping routines
3 *
4 * Copyright (c) 2006 SUSE Linux Products GmbH
5 * Copyright (c) 2006 Tejun Heo <teheo@suse.de>
6 *
7 * This file is released under the GPLv2.
8 */
9
10#include <linux/dma-mapping.h>
11#include <linux/export.h>
12#include <linux/gfp.h>
13#include <asm-generic/dma-coherent.h>
14
15/*
16 * Managed DMA API
17 */
18struct dma_devres {
19 size_t size;
20 void *vaddr;
21 dma_addr_t dma_handle;
22};
23
24static void dmam_coherent_release(struct device *dev, void *res)
25{
26 struct dma_devres *this = res;
27
28 dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle);
29}
30
31static void dmam_noncoherent_release(struct device *dev, void *res)
32{
33 struct dma_devres *this = res;
34
35 dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle);
36}
37
38static int dmam_match(struct device *dev, void *res, void *match_data)
39{
40 struct dma_devres *this = res, *match = match_data;
41
42 if (this->vaddr == match->vaddr) {
43 WARN_ON(this->size != match->size ||
44 this->dma_handle != match->dma_handle);
45 return 1;
46 }
47 return 0;
48}
49
50/**
51 * dmam_alloc_coherent - Managed dma_alloc_coherent()
52 * @dev: Device to allocate coherent memory for
53 * @size: Size of allocation
54 * @dma_handle: Out argument for allocated DMA handle
55 * @gfp: Allocation flags
56 *
57 * Managed dma_alloc_coherent(). Memory allocated using this function
58 * will be automatically released on driver detach.
59 *
60 * RETURNS:
61 * Pointer to allocated memory on success, NULL on failure.
62 */
63void * dmam_alloc_coherent(struct device *dev, size_t size,
64 dma_addr_t *dma_handle, gfp_t gfp)
65{
66 struct dma_devres *dr;
67 void *vaddr;
68
69 dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp);
70 if (!dr)
71 return NULL;
72
73 vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp);
74 if (!vaddr) {
75 devres_free(dr);
76 return NULL;
77 }
78
79 dr->vaddr = vaddr;
80 dr->dma_handle = *dma_handle;
81 dr->size = size;
82
83 devres_add(dev, dr);
84
85 return vaddr;
86}
87EXPORT_SYMBOL(dmam_alloc_coherent);
88
89/**
90 * dmam_free_coherent - Managed dma_free_coherent()
91 * @dev: Device to free coherent memory for
92 * @size: Size of allocation
93 * @vaddr: Virtual address of the memory to free
94 * @dma_handle: DMA handle of the memory to free
95 *
96 * Managed dma_free_coherent().
97 */
98void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
99 dma_addr_t dma_handle)
100{
101 struct dma_devres match_data = { size, vaddr, dma_handle };
102
103 dma_free_coherent(dev, size, vaddr, dma_handle);
104 WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match,
105 &match_data));
106}
107EXPORT_SYMBOL(dmam_free_coherent);
108
109/**
110 * dmam_alloc_non_coherent - Managed dma_alloc_non_coherent()
111 * @dev: Device to allocate non_coherent memory for
112 * @size: Size of allocation
113 * @dma_handle: Out argument for allocated DMA handle
114 * @gfp: Allocation flags
115 *
116 * Managed dma_alloc_non_coherent(). Memory allocated using this
117 * function will be automatically released on driver detach.
118 *
119 * RETURNS:
120 * Pointer to allocated memory on success, NULL on failure.
121 */
122void *dmam_alloc_noncoherent(struct device *dev, size_t size,
123 dma_addr_t *dma_handle, gfp_t gfp)
124{
125 struct dma_devres *dr;
126 void *vaddr;
127
128 dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp);
129 if (!dr)
130 return NULL;
131
132 vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
133 if (!vaddr) {
134 devres_free(dr);
135 return NULL;
136 }
137
138 dr->vaddr = vaddr;
139 dr->dma_handle = *dma_handle;
140 dr->size = size;
141
142 devres_add(dev, dr);
143
144 return vaddr;
145}
146EXPORT_SYMBOL(dmam_alloc_noncoherent);
147
148/**
149 * dmam_free_coherent - Managed dma_free_noncoherent()
150 * @dev: Device to free noncoherent memory for
151 * @size: Size of allocation
152 * @vaddr: Virtual address of the memory to free
153 * @dma_handle: DMA handle of the memory to free
154 *
155 * Managed dma_free_noncoherent().
156 */
157void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
158 dma_addr_t dma_handle)
159{
160 struct dma_devres match_data = { size, vaddr, dma_handle };
161
162 dma_free_noncoherent(dev, size, vaddr, dma_handle);
163 WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match,
164 &match_data));
165}
166EXPORT_SYMBOL(dmam_free_noncoherent);
167
168#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
169
170static void dmam_coherent_decl_release(struct device *dev, void *res)
171{
172 dma_release_declared_memory(dev);
173}
174
175/**
176 * dmam_declare_coherent_memory - Managed dma_declare_coherent_memory()
177 * @dev: Device to declare coherent memory for
178 * @bus_addr: Bus address of coherent memory to be declared
179 * @device_addr: Device address of coherent memory to be declared
180 * @size: Size of coherent memory to be declared
181 * @flags: Flags
182 *
183 * Managed dma_declare_coherent_memory().
184 *
185 * RETURNS:
186 * 0 on success, -errno on failure.
187 */
188int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
189 dma_addr_t device_addr, size_t size, int flags)
190{
191 void *res;
192 int rc;
193
194 res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL);
195 if (!res)
196 return -ENOMEM;
197
198 rc = dma_declare_coherent_memory(dev, bus_addr, device_addr, size,
199 flags);
200 if (rc == 0)
201 devres_add(dev, res);
202 else
203 devres_free(res);
204
205 return rc;
206}
207EXPORT_SYMBOL(dmam_declare_coherent_memory);
208
209/**
210 * dmam_release_declared_memory - Managed dma_release_declared_memory().
211 * @dev: Device to release declared coherent memory for
212 *
213 * Managed dmam_release_declared_memory().
214 */
215void dmam_release_declared_memory(struct device *dev)
216{
217 WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL));
218}
219EXPORT_SYMBOL(dmam_release_declared_memory);
220
221#endif
222
223/*
224 * Create scatter-list for the already allocated DMA buffer.
225 */
226int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
227 void *cpu_addr, dma_addr_t handle, size_t size)
228{
229 struct page *page = virt_to_page(cpu_addr);
230 int ret;
231
232 ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
233 if (unlikely(ret))
234 return ret;
235
236 sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
237 return 0;
238}
239EXPORT_SYMBOL(dma_common_get_sgtable);
240
241/*
242 * Create userspace mapping for the DMA-coherent memory.
243 */
244int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
245 void *cpu_addr, dma_addr_t dma_addr, size_t size)
246{
247 int ret = -ENXIO;
248#ifdef CONFIG_MMU
249 unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
250 unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
251 unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr));
252 unsigned long off = vma->vm_pgoff;
253
254 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
255
256 if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
257 return ret;
258
259 if (off < count && user_count <= (count - off)) {
260 ret = remap_pfn_range(vma, vma->vm_start,
261 pfn + off,
262 user_count << PAGE_SHIFT,
263 vma->vm_page_prot);
264 }
265#endif /* CONFIG_MMU */
266
267 return ret;
268}
269EXPORT_SYMBOL(dma_common_mmap);
1/*
2 * drivers/base/dma-mapping.c - arch-independent dma-mapping routines
3 *
4 * Copyright (c) 2006 SUSE Linux Products GmbH
5 * Copyright (c) 2006 Tejun Heo <teheo@suse.de>
6 *
7 * This file is released under the GPLv2.
8 */
9
10#include <linux/dma-mapping.h>
11#include <linux/gfp.h>
12
13/*
14 * Managed DMA API
15 */
16struct dma_devres {
17 size_t size;
18 void *vaddr;
19 dma_addr_t dma_handle;
20};
21
22static void dmam_coherent_release(struct device *dev, void *res)
23{
24 struct dma_devres *this = res;
25
26 dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle);
27}
28
29static void dmam_noncoherent_release(struct device *dev, void *res)
30{
31 struct dma_devres *this = res;
32
33 dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle);
34}
35
36static int dmam_match(struct device *dev, void *res, void *match_data)
37{
38 struct dma_devres *this = res, *match = match_data;
39
40 if (this->vaddr == match->vaddr) {
41 WARN_ON(this->size != match->size ||
42 this->dma_handle != match->dma_handle);
43 return 1;
44 }
45 return 0;
46}
47
48/**
49 * dmam_alloc_coherent - Managed dma_alloc_coherent()
50 * @dev: Device to allocate coherent memory for
51 * @size: Size of allocation
52 * @dma_handle: Out argument for allocated DMA handle
53 * @gfp: Allocation flags
54 *
55 * Managed dma_alloc_coherent(). Memory allocated using this function
56 * will be automatically released on driver detach.
57 *
58 * RETURNS:
59 * Pointer to allocated memory on success, NULL on failure.
60 */
61void * dmam_alloc_coherent(struct device *dev, size_t size,
62 dma_addr_t *dma_handle, gfp_t gfp)
63{
64 struct dma_devres *dr;
65 void *vaddr;
66
67 dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp);
68 if (!dr)
69 return NULL;
70
71 vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp);
72 if (!vaddr) {
73 devres_free(dr);
74 return NULL;
75 }
76
77 dr->vaddr = vaddr;
78 dr->dma_handle = *dma_handle;
79 dr->size = size;
80
81 devres_add(dev, dr);
82
83 return vaddr;
84}
85EXPORT_SYMBOL(dmam_alloc_coherent);
86
87/**
88 * dmam_free_coherent - Managed dma_free_coherent()
89 * @dev: Device to free coherent memory for
90 * @size: Size of allocation
91 * @vaddr: Virtual address of the memory to free
92 * @dma_handle: DMA handle of the memory to free
93 *
94 * Managed dma_free_coherent().
95 */
96void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
97 dma_addr_t dma_handle)
98{
99 struct dma_devres match_data = { size, vaddr, dma_handle };
100
101 dma_free_coherent(dev, size, vaddr, dma_handle);
102 WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match,
103 &match_data));
104}
105EXPORT_SYMBOL(dmam_free_coherent);
106
107/**
108 * dmam_alloc_non_coherent - Managed dma_alloc_non_coherent()
109 * @dev: Device to allocate non_coherent memory for
110 * @size: Size of allocation
111 * @dma_handle: Out argument for allocated DMA handle
112 * @gfp: Allocation flags
113 *
114 * Managed dma_alloc_non_coherent(). Memory allocated using this
115 * function will be automatically released on driver detach.
116 *
117 * RETURNS:
118 * Pointer to allocated memory on success, NULL on failure.
119 */
120void *dmam_alloc_noncoherent(struct device *dev, size_t size,
121 dma_addr_t *dma_handle, gfp_t gfp)
122{
123 struct dma_devres *dr;
124 void *vaddr;
125
126 dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp);
127 if (!dr)
128 return NULL;
129
130 vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
131 if (!vaddr) {
132 devres_free(dr);
133 return NULL;
134 }
135
136 dr->vaddr = vaddr;
137 dr->dma_handle = *dma_handle;
138 dr->size = size;
139
140 devres_add(dev, dr);
141
142 return vaddr;
143}
144EXPORT_SYMBOL(dmam_alloc_noncoherent);
145
146/**
147 * dmam_free_coherent - Managed dma_free_noncoherent()
148 * @dev: Device to free noncoherent memory for
149 * @size: Size of allocation
150 * @vaddr: Virtual address of the memory to free
151 * @dma_handle: DMA handle of the memory to free
152 *
153 * Managed dma_free_noncoherent().
154 */
155void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
156 dma_addr_t dma_handle)
157{
158 struct dma_devres match_data = { size, vaddr, dma_handle };
159
160 dma_free_noncoherent(dev, size, vaddr, dma_handle);
161 WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match,
162 &match_data));
163}
164EXPORT_SYMBOL(dmam_free_noncoherent);
165
166#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
167
168static void dmam_coherent_decl_release(struct device *dev, void *res)
169{
170 dma_release_declared_memory(dev);
171}
172
173/**
174 * dmam_declare_coherent_memory - Managed dma_declare_coherent_memory()
175 * @dev: Device to declare coherent memory for
176 * @bus_addr: Bus address of coherent memory to be declared
177 * @device_addr: Device address of coherent memory to be declared
178 * @size: Size of coherent memory to be declared
179 * @flags: Flags
180 *
181 * Managed dma_declare_coherent_memory().
182 *
183 * RETURNS:
184 * 0 on success, -errno on failure.
185 */
186int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
187 dma_addr_t device_addr, size_t size, int flags)
188{
189 void *res;
190 int rc;
191
192 res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL);
193 if (!res)
194 return -ENOMEM;
195
196 rc = dma_declare_coherent_memory(dev, bus_addr, device_addr, size,
197 flags);
198 if (rc == 0)
199 devres_add(dev, res);
200 else
201 devres_free(res);
202
203 return rc;
204}
205EXPORT_SYMBOL(dmam_declare_coherent_memory);
206
207/**
208 * dmam_release_declared_memory - Managed dma_release_declared_memory().
209 * @dev: Device to release declared coherent memory for
210 *
211 * Managed dmam_release_declared_memory().
212 */
213void dmam_release_declared_memory(struct device *dev)
214{
215 WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL));
216}
217EXPORT_SYMBOL(dmam_release_declared_memory);
218
219#endif