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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#ifdef CONFIG_X86
14#include <asm/set_memory.h>
15#endif
16#include <sound/memalloc.h>
17
18/*
19 *
20 * Bus-specific memory allocators
21 *
22 */
23
24#ifdef CONFIG_HAS_DMA
25/* allocate the coherent DMA pages */
26static void snd_malloc_dev_pages(struct snd_dma_buffer *dmab, size_t size)
27{
28 gfp_t gfp_flags;
29
30 gfp_flags = GFP_KERNEL
31 | __GFP_COMP /* compound page lets parts be mapped */
32 | __GFP_NORETRY /* don't trigger OOM-killer */
33 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
34 dmab->area = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr,
35 gfp_flags);
36#ifdef CONFIG_X86
37 if (dmab->area && dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
38 set_memory_wc((unsigned long)dmab->area,
39 PAGE_ALIGN(size) >> PAGE_SHIFT);
40#endif
41}
42
43/* free the coherent DMA pages */
44static void snd_free_dev_pages(struct snd_dma_buffer *dmab)
45{
46#ifdef CONFIG_X86
47 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
48 set_memory_wb((unsigned long)dmab->area,
49 PAGE_ALIGN(dmab->bytes) >> PAGE_SHIFT);
50#endif
51 dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
52}
53
54#ifdef CONFIG_GENERIC_ALLOCATOR
55/**
56 * snd_malloc_dev_iram - allocate memory from on-chip internal ram
57 * @dmab: buffer allocation record to store the allocated data
58 * @size: number of bytes to allocate from the iram
59 *
60 * This function requires iram phandle provided via of_node
61 */
62static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
63{
64 struct device *dev = dmab->dev.dev;
65 struct gen_pool *pool = NULL;
66
67 dmab->area = NULL;
68 dmab->addr = 0;
69
70 if (dev->of_node)
71 pool = of_gen_pool_get(dev->of_node, "iram", 0);
72
73 if (!pool)
74 return;
75
76 /* Assign the pool into private_data field */
77 dmab->private_data = pool;
78
79 dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
80}
81
82/**
83 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
84 * @dmab: buffer allocation record to store the allocated data
85 */
86static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
87{
88 struct gen_pool *pool = dmab->private_data;
89
90 if (pool && dmab->area)
91 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
92}
93#endif /* CONFIG_GENERIC_ALLOCATOR */
94#endif /* CONFIG_HAS_DMA */
95
96/*
97 *
98 * ALSA generic memory management
99 *
100 */
101
102
103/**
104 * snd_dma_alloc_pages - allocate the buffer area according to the given type
105 * @type: the DMA buffer type
106 * @device: the device pointer
107 * @size: the buffer size to allocate
108 * @dmab: buffer allocation record to store the allocated data
109 *
110 * Calls the memory-allocator function for the corresponding
111 * buffer type.
112 *
113 * Return: Zero if the buffer with the given size is allocated successfully,
114 * otherwise a negative value on error.
115 */
116int snd_dma_alloc_pages(int type, struct device *device, size_t size,
117 struct snd_dma_buffer *dmab)
118{
119 if (WARN_ON(!size))
120 return -ENXIO;
121 if (WARN_ON(!dmab))
122 return -ENXIO;
123 if (WARN_ON(!device))
124 return -EINVAL;
125
126 dmab->dev.type = type;
127 dmab->dev.dev = device;
128 dmab->bytes = 0;
129 switch (type) {
130 case SNDRV_DMA_TYPE_CONTINUOUS:
131 dmab->area = alloc_pages_exact(size,
132 (__force gfp_t)(unsigned long)device);
133 dmab->addr = 0;
134 break;
135#ifdef CONFIG_HAS_DMA
136#ifdef CONFIG_GENERIC_ALLOCATOR
137 case SNDRV_DMA_TYPE_DEV_IRAM:
138 snd_malloc_dev_iram(dmab, size);
139 if (dmab->area)
140 break;
141 /* Internal memory might have limited size and no enough space,
142 * so if we fail to malloc, try to fetch memory traditionally.
143 */
144 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
145#endif /* CONFIG_GENERIC_ALLOCATOR */
146 /* fall through */
147 case SNDRV_DMA_TYPE_DEV:
148 case SNDRV_DMA_TYPE_DEV_UC:
149 snd_malloc_dev_pages(dmab, size);
150 break;
151#endif
152#ifdef CONFIG_SND_DMA_SGBUF
153 case SNDRV_DMA_TYPE_DEV_SG:
154 case SNDRV_DMA_TYPE_DEV_UC_SG:
155 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
156 break;
157#endif
158 default:
159 pr_err("snd-malloc: invalid device type %d\n", type);
160 dmab->area = NULL;
161 dmab->addr = 0;
162 return -ENXIO;
163 }
164 if (! dmab->area)
165 return -ENOMEM;
166 dmab->bytes = size;
167 return 0;
168}
169EXPORT_SYMBOL(snd_dma_alloc_pages);
170
171/**
172 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
173 * @type: the DMA buffer type
174 * @device: the device pointer
175 * @size: the buffer size to allocate
176 * @dmab: buffer allocation record to store the allocated data
177 *
178 * Calls the memory-allocator function for the corresponding
179 * buffer type. When no space is left, this function reduces the size and
180 * tries to allocate again. The size actually allocated is stored in
181 * res_size argument.
182 *
183 * Return: Zero if the buffer with the given size is allocated successfully,
184 * otherwise a negative value on error.
185 */
186int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
187 struct snd_dma_buffer *dmab)
188{
189 int err;
190
191 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
192 if (err != -ENOMEM)
193 return err;
194 if (size <= PAGE_SIZE)
195 return -ENOMEM;
196 size >>= 1;
197 size = PAGE_SIZE << get_order(size);
198 }
199 if (! dmab->area)
200 return -ENOMEM;
201 return 0;
202}
203EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
204
205
206/**
207 * snd_dma_free_pages - release the allocated buffer
208 * @dmab: the buffer allocation record to release
209 *
210 * Releases the allocated buffer via snd_dma_alloc_pages().
211 */
212void snd_dma_free_pages(struct snd_dma_buffer *dmab)
213{
214 switch (dmab->dev.type) {
215 case SNDRV_DMA_TYPE_CONTINUOUS:
216 free_pages_exact(dmab->area, dmab->bytes);
217 break;
218#ifdef CONFIG_HAS_DMA
219#ifdef CONFIG_GENERIC_ALLOCATOR
220 case SNDRV_DMA_TYPE_DEV_IRAM:
221 snd_free_dev_iram(dmab);
222 break;
223#endif /* CONFIG_GENERIC_ALLOCATOR */
224 case SNDRV_DMA_TYPE_DEV:
225 case SNDRV_DMA_TYPE_DEV_UC:
226 snd_free_dev_pages(dmab);
227 break;
228#endif
229#ifdef CONFIG_SND_DMA_SGBUF
230 case SNDRV_DMA_TYPE_DEV_SG:
231 case SNDRV_DMA_TYPE_DEV_UC_SG:
232 snd_free_sgbuf_pages(dmab);
233 break;
234#endif
235 default:
236 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
237 }
238}
239EXPORT_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}
57EXPORT_SYMBOL(snd_malloc_pages);
58
59/**
60 * snd_free_pages - release the pages
61 * @ptr: the buffer pointer to release
62 * @size: the allocated buffer size
63 *
64 * Releases the buffer allocated via snd_malloc_pages().
65 */
66void snd_free_pages(void *ptr, size_t size)
67{
68 int pg;
69
70 if (ptr == NULL)
71 return;
72 pg = get_order(size);
73 free_pages((unsigned long) ptr, pg);
74}
75EXPORT_SYMBOL(snd_free_pages);
76
77/*
78 *
79 * Bus-specific memory allocators
80 *
81 */
82
83#ifdef CONFIG_HAS_DMA
84/* allocate the coherent DMA pages */
85static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
86{
87 int pg;
88 gfp_t gfp_flags;
89
90 if (WARN_ON(!dma))
91 return NULL;
92 pg = get_order(size);
93 gfp_flags = GFP_KERNEL
94 | __GFP_COMP /* compound page lets parts be mapped */
95 | __GFP_NORETRY /* don't trigger OOM-killer */
96 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
97 return dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
98}
99
100/* free the coherent DMA pages */
101static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
102 dma_addr_t dma)
103{
104 int pg;
105
106 if (ptr == NULL)
107 return;
108 pg = get_order(size);
109 dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
110}
111
112#ifdef CONFIG_GENERIC_ALLOCATOR
113/**
114 * snd_malloc_dev_iram - allocate memory from on-chip internal ram
115 * @dmab: buffer allocation record to store the allocated data
116 * @size: number of bytes to allocate from the iram
117 *
118 * This function requires iram phandle provided via of_node
119 */
120static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
121{
122 struct device *dev = dmab->dev.dev;
123 struct gen_pool *pool = NULL;
124
125 dmab->area = NULL;
126 dmab->addr = 0;
127
128 if (dev->of_node)
129 pool = of_gen_pool_get(dev->of_node, "iram", 0);
130
131 if (!pool)
132 return;
133
134 /* Assign the pool into private_data field */
135 dmab->private_data = pool;
136
137 dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
138}
139
140/**
141 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
142 * @dmab: buffer allocation record to store the allocated data
143 */
144static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
145{
146 struct gen_pool *pool = dmab->private_data;
147
148 if (pool && dmab->area)
149 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
150}
151#endif /* CONFIG_GENERIC_ALLOCATOR */
152#endif /* CONFIG_HAS_DMA */
153
154/*
155 *
156 * ALSA generic memory management
157 *
158 */
159
160
161/**
162 * snd_dma_alloc_pages - allocate the buffer area according to the given type
163 * @type: the DMA buffer type
164 * @device: the device pointer
165 * @size: the buffer size to allocate
166 * @dmab: buffer allocation record to store the allocated data
167 *
168 * Calls the memory-allocator function for the corresponding
169 * buffer type.
170 *
171 * Return: Zero if the buffer with the given size is allocated successfully,
172 * otherwise a negative value on error.
173 */
174int snd_dma_alloc_pages(int type, struct device *device, size_t size,
175 struct snd_dma_buffer *dmab)
176{
177 if (WARN_ON(!size))
178 return -ENXIO;
179 if (WARN_ON(!dmab))
180 return -ENXIO;
181
182 dmab->dev.type = type;
183 dmab->dev.dev = device;
184 dmab->bytes = 0;
185 switch (type) {
186 case SNDRV_DMA_TYPE_CONTINUOUS:
187 dmab->area = snd_malloc_pages(size,
188 (__force gfp_t)(unsigned long)device);
189 dmab->addr = 0;
190 break;
191#ifdef CONFIG_HAS_DMA
192#ifdef CONFIG_GENERIC_ALLOCATOR
193 case SNDRV_DMA_TYPE_DEV_IRAM:
194 snd_malloc_dev_iram(dmab, size);
195 if (dmab->area)
196 break;
197 /* Internal memory might have limited size and no enough space,
198 * so if we fail to malloc, try to fetch memory traditionally.
199 */
200 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
201#endif /* CONFIG_GENERIC_ALLOCATOR */
202 case SNDRV_DMA_TYPE_DEV:
203 dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
204 break;
205#endif
206#ifdef CONFIG_SND_DMA_SGBUF
207 case SNDRV_DMA_TYPE_DEV_SG:
208 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
209 break;
210#endif
211 default:
212 pr_err("snd-malloc: invalid device type %d\n", type);
213 dmab->area = NULL;
214 dmab->addr = 0;
215 return -ENXIO;
216 }
217 if (! dmab->area)
218 return -ENOMEM;
219 dmab->bytes = size;
220 return 0;
221}
222EXPORT_SYMBOL(snd_dma_alloc_pages);
223
224/**
225 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
226 * @type: the DMA buffer type
227 * @device: the device pointer
228 * @size: the buffer size to allocate
229 * @dmab: buffer allocation record to store the allocated data
230 *
231 * Calls the memory-allocator function for the corresponding
232 * buffer type. When no space is left, this function reduces the size and
233 * tries to allocate again. The size actually allocated is stored in
234 * res_size argument.
235 *
236 * Return: Zero if the buffer with the given size is allocated successfully,
237 * otherwise a negative value on error.
238 */
239int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
240 struct snd_dma_buffer *dmab)
241{
242 int err;
243
244 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
245 size_t aligned_size;
246 if (err != -ENOMEM)
247 return err;
248 if (size <= PAGE_SIZE)
249 return -ENOMEM;
250 aligned_size = PAGE_SIZE << get_order(size);
251 if (size != aligned_size)
252 size = aligned_size;
253 else
254 size >>= 1;
255 }
256 if (! dmab->area)
257 return -ENOMEM;
258 return 0;
259}
260EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
261
262
263/**
264 * snd_dma_free_pages - release the allocated buffer
265 * @dmab: the buffer allocation record to release
266 *
267 * Releases the allocated buffer via snd_dma_alloc_pages().
268 */
269void snd_dma_free_pages(struct snd_dma_buffer *dmab)
270{
271 switch (dmab->dev.type) {
272 case SNDRV_DMA_TYPE_CONTINUOUS:
273 snd_free_pages(dmab->area, dmab->bytes);
274 break;
275#ifdef CONFIG_HAS_DMA
276#ifdef CONFIG_GENERIC_ALLOCATOR
277 case SNDRV_DMA_TYPE_DEV_IRAM:
278 snd_free_dev_iram(dmab);
279 break;
280#endif /* CONFIG_GENERIC_ALLOCATOR */
281 case SNDRV_DMA_TYPE_DEV:
282 snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
283 break;
284#endif
285#ifdef CONFIG_SND_DMA_SGBUF
286 case SNDRV_DMA_TYPE_DEV_SG:
287 snd_free_sgbuf_pages(dmab);
288 break;
289#endif
290 default:
291 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
292 }
293}
294EXPORT_SYMBOL(snd_dma_free_pages);