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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Takashi Iwai <tiwai@suse.de>
5 *
6 * Generic memory allocators
7 */
8
9#include <linux/slab.h>
10#include <linux/mm.h>
11#include <linux/dma-mapping.h>
12#include <linux/genalloc.h>
13#include <linux/vmalloc.h>
14#ifdef CONFIG_X86
15#include <asm/set_memory.h>
16#endif
17#include <sound/memalloc.h>
18
19/*
20 *
21 * Bus-specific memory allocators
22 *
23 */
24
25#ifdef CONFIG_HAS_DMA
26/* allocate the coherent DMA pages */
27static void snd_malloc_dev_pages(struct snd_dma_buffer *dmab, size_t size)
28{
29 gfp_t gfp_flags;
30
31 gfp_flags = GFP_KERNEL
32 | __GFP_COMP /* compound page lets parts be mapped */
33 | __GFP_NORETRY /* don't trigger OOM-killer */
34 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
35 dmab->area = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr,
36 gfp_flags);
37#ifdef CONFIG_X86
38 if (dmab->area && dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
39 set_memory_wc((unsigned long)dmab->area,
40 PAGE_ALIGN(size) >> PAGE_SHIFT);
41#endif
42}
43
44/* free the coherent DMA pages */
45static void snd_free_dev_pages(struct snd_dma_buffer *dmab)
46{
47#ifdef CONFIG_X86
48 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
49 set_memory_wb((unsigned long)dmab->area,
50 PAGE_ALIGN(dmab->bytes) >> PAGE_SHIFT);
51#endif
52 dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
53}
54
55#ifdef CONFIG_GENERIC_ALLOCATOR
56/**
57 * snd_malloc_dev_iram - allocate memory from on-chip internal ram
58 * @dmab: buffer allocation record to store the allocated data
59 * @size: number of bytes to allocate from the iram
60 *
61 * This function requires iram phandle provided via of_node
62 */
63static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
64{
65 struct device *dev = dmab->dev.dev;
66 struct gen_pool *pool = NULL;
67
68 dmab->area = NULL;
69 dmab->addr = 0;
70
71 if (dev->of_node)
72 pool = of_gen_pool_get(dev->of_node, "iram", 0);
73
74 if (!pool)
75 return;
76
77 /* Assign the pool into private_data field */
78 dmab->private_data = pool;
79
80 dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
81}
82
83/**
84 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
85 * @dmab: buffer allocation record to store the allocated data
86 */
87static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
88{
89 struct gen_pool *pool = dmab->private_data;
90
91 if (pool && dmab->area)
92 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
93}
94#endif /* CONFIG_GENERIC_ALLOCATOR */
95#endif /* CONFIG_HAS_DMA */
96
97/*
98 *
99 * ALSA generic memory management
100 *
101 */
102
103static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev,
104 gfp_t default_gfp)
105{
106 if (!dev)
107 return default_gfp;
108 else
109 return (__force gfp_t)(unsigned long)dev;
110}
111
112/**
113 * snd_dma_alloc_pages - allocate the buffer area according to the given type
114 * @type: the DMA buffer type
115 * @device: the device pointer
116 * @size: the buffer size to allocate
117 * @dmab: buffer allocation record to store the allocated data
118 *
119 * Calls the memory-allocator function for the corresponding
120 * buffer type.
121 *
122 * Return: Zero if the buffer with the given size is allocated successfully,
123 * otherwise a negative value on error.
124 */
125int snd_dma_alloc_pages(int type, struct device *device, size_t size,
126 struct snd_dma_buffer *dmab)
127{
128 gfp_t gfp;
129
130 if (WARN_ON(!size))
131 return -ENXIO;
132 if (WARN_ON(!dmab))
133 return -ENXIO;
134
135 dmab->dev.type = type;
136 dmab->dev.dev = device;
137 dmab->bytes = 0;
138 dmab->area = NULL;
139 dmab->addr = 0;
140 dmab->private_data = NULL;
141 switch (type) {
142 case SNDRV_DMA_TYPE_CONTINUOUS:
143 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL);
144 dmab->area = alloc_pages_exact(size, gfp);
145 break;
146 case SNDRV_DMA_TYPE_VMALLOC:
147 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL | __GFP_HIGHMEM);
148 dmab->area = __vmalloc(size, gfp);
149 break;
150#ifdef CONFIG_HAS_DMA
151#ifdef CONFIG_GENERIC_ALLOCATOR
152 case SNDRV_DMA_TYPE_DEV_IRAM:
153 snd_malloc_dev_iram(dmab, size);
154 if (dmab->area)
155 break;
156 /* Internal memory might have limited size and no enough space,
157 * so if we fail to malloc, try to fetch memory traditionally.
158 */
159 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
160#endif /* CONFIG_GENERIC_ALLOCATOR */
161 fallthrough;
162 case SNDRV_DMA_TYPE_DEV:
163 case SNDRV_DMA_TYPE_DEV_UC:
164 snd_malloc_dev_pages(dmab, size);
165 break;
166#endif
167#ifdef CONFIG_SND_DMA_SGBUF
168 case SNDRV_DMA_TYPE_DEV_SG:
169 case SNDRV_DMA_TYPE_DEV_UC_SG:
170 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
171 break;
172#endif
173 default:
174 pr_err("snd-malloc: invalid device type %d\n", type);
175 return -ENXIO;
176 }
177 if (! dmab->area)
178 return -ENOMEM;
179 dmab->bytes = size;
180 return 0;
181}
182EXPORT_SYMBOL(snd_dma_alloc_pages);
183
184/**
185 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
186 * @type: the DMA buffer type
187 * @device: the device pointer
188 * @size: the buffer size to allocate
189 * @dmab: buffer allocation record to store the allocated data
190 *
191 * Calls the memory-allocator function for the corresponding
192 * buffer type. When no space is left, this function reduces the size and
193 * tries to allocate again. The size actually allocated is stored in
194 * res_size argument.
195 *
196 * Return: Zero if the buffer with the given size is allocated successfully,
197 * otherwise a negative value on error.
198 */
199int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
200 struct snd_dma_buffer *dmab)
201{
202 int err;
203
204 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
205 if (err != -ENOMEM)
206 return err;
207 if (size <= PAGE_SIZE)
208 return -ENOMEM;
209 size >>= 1;
210 size = PAGE_SIZE << get_order(size);
211 }
212 if (! dmab->area)
213 return -ENOMEM;
214 return 0;
215}
216EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
217
218
219/**
220 * snd_dma_free_pages - release the allocated buffer
221 * @dmab: the buffer allocation record to release
222 *
223 * Releases the allocated buffer via snd_dma_alloc_pages().
224 */
225void snd_dma_free_pages(struct snd_dma_buffer *dmab)
226{
227 switch (dmab->dev.type) {
228 case SNDRV_DMA_TYPE_CONTINUOUS:
229 free_pages_exact(dmab->area, dmab->bytes);
230 break;
231 case SNDRV_DMA_TYPE_VMALLOC:
232 vfree(dmab->area);
233 break;
234#ifdef CONFIG_HAS_DMA
235#ifdef CONFIG_GENERIC_ALLOCATOR
236 case SNDRV_DMA_TYPE_DEV_IRAM:
237 snd_free_dev_iram(dmab);
238 break;
239#endif /* CONFIG_GENERIC_ALLOCATOR */
240 case SNDRV_DMA_TYPE_DEV:
241 case SNDRV_DMA_TYPE_DEV_UC:
242 snd_free_dev_pages(dmab);
243 break;
244#endif
245#ifdef CONFIG_SND_DMA_SGBUF
246 case SNDRV_DMA_TYPE_DEV_SG:
247 case SNDRV_DMA_TYPE_DEV_UC_SG:
248 snd_free_sgbuf_pages(dmab);
249 break;
250#endif
251 default:
252 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
253 }
254}
255EXPORT_SYMBOL(snd_dma_free_pages);
1/*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Takashi Iwai <tiwai@suse.de>
4 *
5 * Generic memory allocators
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24#include <linux/slab.h>
25#include <linux/mm.h>
26#include <linux/dma-mapping.h>
27#include <linux/genalloc.h>
28#include <sound/memalloc.h>
29
30/*
31 *
32 * Generic memory allocators
33 *
34 */
35
36/**
37 * snd_malloc_pages - allocate pages with the given size
38 * @size: the size to allocate in bytes
39 * @gfp_flags: the allocation conditions, GFP_XXX
40 *
41 * Allocates the physically contiguous pages with the given size.
42 *
43 * Return: The pointer of the buffer, or %NULL if no enough memory.
44 */
45void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
46{
47 int pg;
48
49 if (WARN_ON(!size))
50 return NULL;
51 if (WARN_ON(!gfp_flags))
52 return NULL;
53 gfp_flags |= __GFP_COMP; /* compound page lets parts be mapped */
54 pg = get_order(size);
55 return (void *) __get_free_pages(gfp_flags, pg);
56}
57
58/**
59 * snd_free_pages - release the pages
60 * @ptr: the buffer pointer to release
61 * @size: the allocated buffer size
62 *
63 * Releases the buffer allocated via snd_malloc_pages().
64 */
65void snd_free_pages(void *ptr, size_t size)
66{
67 int pg;
68
69 if (ptr == NULL)
70 return;
71 pg = get_order(size);
72 free_pages((unsigned long) ptr, pg);
73}
74
75/*
76 *
77 * Bus-specific memory allocators
78 *
79 */
80
81#ifdef CONFIG_HAS_DMA
82/* allocate the coherent DMA pages */
83static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
84{
85 int pg;
86 gfp_t gfp_flags;
87
88 if (WARN_ON(!dma))
89 return NULL;
90 pg = get_order(size);
91 gfp_flags = GFP_KERNEL
92 | __GFP_COMP /* compound page lets parts be mapped */
93 | __GFP_NORETRY /* don't trigger OOM-killer */
94 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
95 return dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
96}
97
98/* free the coherent DMA pages */
99static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
100 dma_addr_t dma)
101{
102 int pg;
103
104 if (ptr == NULL)
105 return;
106 pg = get_order(size);
107 dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
108}
109
110#ifdef CONFIG_GENERIC_ALLOCATOR
111/**
112 * snd_malloc_dev_iram - allocate memory from on-chip internal ram
113 * @dmab: buffer allocation record to store the allocated data
114 * @size: number of bytes to allocate from the iram
115 *
116 * This function requires iram phandle provided via of_node
117 */
118static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
119{
120 struct device *dev = dmab->dev.dev;
121 struct gen_pool *pool = NULL;
122
123 dmab->area = NULL;
124 dmab->addr = 0;
125
126 if (dev->of_node)
127 pool = of_get_named_gen_pool(dev->of_node, "iram", 0);
128
129 if (!pool)
130 return;
131
132 /* Assign the pool into private_data field */
133 dmab->private_data = pool;
134
135 dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
136}
137
138/**
139 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
140 * @dmab: buffer allocation record to store the allocated data
141 */
142static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
143{
144 struct gen_pool *pool = dmab->private_data;
145
146 if (pool && dmab->area)
147 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
148}
149#endif /* CONFIG_GENERIC_ALLOCATOR */
150#endif /* CONFIG_HAS_DMA */
151
152/*
153 *
154 * ALSA generic memory management
155 *
156 */
157
158
159/**
160 * snd_dma_alloc_pages - allocate the buffer area according to the given type
161 * @type: the DMA buffer type
162 * @device: the device pointer
163 * @size: the buffer size to allocate
164 * @dmab: buffer allocation record to store the allocated data
165 *
166 * Calls the memory-allocator function for the corresponding
167 * buffer type.
168 *
169 * Return: Zero if the buffer with the given size is allocated successfully,
170 * otherwise a negative value on error.
171 */
172int snd_dma_alloc_pages(int type, struct device *device, size_t size,
173 struct snd_dma_buffer *dmab)
174{
175 if (WARN_ON(!size))
176 return -ENXIO;
177 if (WARN_ON(!dmab))
178 return -ENXIO;
179
180 dmab->dev.type = type;
181 dmab->dev.dev = device;
182 dmab->bytes = 0;
183 switch (type) {
184 case SNDRV_DMA_TYPE_CONTINUOUS:
185 dmab->area = snd_malloc_pages(size,
186 (__force gfp_t)(unsigned long)device);
187 dmab->addr = 0;
188 break;
189#ifdef CONFIG_HAS_DMA
190#ifdef CONFIG_GENERIC_ALLOCATOR
191 case SNDRV_DMA_TYPE_DEV_IRAM:
192 snd_malloc_dev_iram(dmab, size);
193 if (dmab->area)
194 break;
195 /* Internal memory might have limited size and no enough space,
196 * so if we fail to malloc, try to fetch memory traditionally.
197 */
198 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
199#endif /* CONFIG_GENERIC_ALLOCATOR */
200 case SNDRV_DMA_TYPE_DEV:
201 dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
202 break;
203#endif
204#ifdef CONFIG_SND_DMA_SGBUF
205 case SNDRV_DMA_TYPE_DEV_SG:
206 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
207 break;
208#endif
209 default:
210 pr_err("snd-malloc: invalid device type %d\n", type);
211 dmab->area = NULL;
212 dmab->addr = 0;
213 return -ENXIO;
214 }
215 if (! dmab->area)
216 return -ENOMEM;
217 dmab->bytes = size;
218 return 0;
219}
220
221/**
222 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
223 * @type: the DMA buffer type
224 * @device: the device pointer
225 * @size: the buffer size to allocate
226 * @dmab: buffer allocation record to store the allocated data
227 *
228 * Calls the memory-allocator function for the corresponding
229 * buffer type. When no space is left, this function reduces the size and
230 * tries to allocate again. The size actually allocated is stored in
231 * res_size argument.
232 *
233 * Return: Zero if the buffer with the given size is allocated successfully,
234 * otherwise a negative value on error.
235 */
236int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
237 struct snd_dma_buffer *dmab)
238{
239 int err;
240
241 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
242 size_t aligned_size;
243 if (err != -ENOMEM)
244 return err;
245 if (size <= PAGE_SIZE)
246 return -ENOMEM;
247 aligned_size = PAGE_SIZE << get_order(size);
248 if (size != aligned_size)
249 size = aligned_size;
250 else
251 size >>= 1;
252 }
253 if (! dmab->area)
254 return -ENOMEM;
255 return 0;
256}
257
258
259/**
260 * snd_dma_free_pages - release the allocated buffer
261 * @dmab: the buffer allocation record to release
262 *
263 * Releases the allocated buffer via snd_dma_alloc_pages().
264 */
265void snd_dma_free_pages(struct snd_dma_buffer *dmab)
266{
267 switch (dmab->dev.type) {
268 case SNDRV_DMA_TYPE_CONTINUOUS:
269 snd_free_pages(dmab->area, dmab->bytes);
270 break;
271#ifdef CONFIG_HAS_DMA
272#ifdef CONFIG_GENERIC_ALLOCATOR
273 case SNDRV_DMA_TYPE_DEV_IRAM:
274 snd_free_dev_iram(dmab);
275 break;
276#endif /* CONFIG_GENERIC_ALLOCATOR */
277 case SNDRV_DMA_TYPE_DEV:
278 snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
279 break;
280#endif
281#ifdef CONFIG_SND_DMA_SGBUF
282 case SNDRV_DMA_TYPE_DEV_SG:
283 snd_free_sgbuf_pages(dmab);
284 break;
285#endif
286 default:
287 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
288 }
289}
290
291/*
292 * exports
293 */
294EXPORT_SYMBOL(snd_dma_alloc_pages);
295EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
296EXPORT_SYMBOL(snd_dma_free_pages);
297
298EXPORT_SYMBOL(snd_malloc_pages);
299EXPORT_SYMBOL(snd_free_pages);