2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Takashi Iwai <tiwai@suse.de>
5 * Generic memory allocators
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.
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.
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
24 #include <linux/slab.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/genalloc.h>
28 #include <sound/memalloc.h>
32 * Generic memory allocators
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
41 * Allocates the physically contiguous pages with the given size.
43 * Return: The pointer of the buffer, or %NULL if no enough memory.
45 void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
51 if (WARN_ON(!gfp_flags))
53 gfp_flags |= __GFP_COMP; /* compound page lets parts be mapped */
55 return (void *) __get_free_pages(gfp_flags, pg);
57 EXPORT_SYMBOL(snd_malloc_pages);
60 * snd_free_pages - release the pages
61 * @ptr: the buffer pointer to release
62 * @size: the allocated buffer size
64 * Releases the buffer allocated via snd_malloc_pages().
66 void snd_free_pages(void *ptr, size_t size)
73 free_pages((unsigned long) ptr, pg);
75 EXPORT_SYMBOL(snd_free_pages);
79 * Bus-specific memory allocators
84 /* allocate the coherent DMA pages */
85 static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
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);
100 /* free the coherent DMA pages */
101 static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
108 pg = get_order(size);
109 dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
112 #ifdef CONFIG_GENERIC_ALLOCATOR
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
118 * This function requires iram phandle provided via of_node
120 static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
122 struct device *dev = dmab->dev.dev;
123 struct gen_pool *pool = NULL;
129 pool = of_gen_pool_get(dev->of_node, "iram", 0);
134 /* Assign the pool into private_data field */
135 dmab->private_data = pool;
137 dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
141 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
142 * @dmab: buffer allocation record to store the allocated data
144 static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
146 struct gen_pool *pool = dmab->private_data;
148 if (pool && dmab->area)
149 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
151 #endif /* CONFIG_GENERIC_ALLOCATOR */
152 #endif /* CONFIG_HAS_DMA */
156 * ALSA generic memory management
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
168 * Calls the memory-allocator function for the corresponding
171 * Return: Zero if the buffer with the given size is allocated successfully,
172 * otherwise a negative value on error.
174 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
175 struct snd_dma_buffer *dmab)
182 dmab->dev.type = type;
183 dmab->dev.dev = device;
186 case SNDRV_DMA_TYPE_CONTINUOUS:
187 dmab->area = snd_malloc_pages(size,
188 (__force gfp_t)(unsigned long)device);
191 #ifdef CONFIG_HAS_DMA
192 #ifdef CONFIG_GENERIC_ALLOCATOR
193 case SNDRV_DMA_TYPE_DEV_IRAM:
194 snd_malloc_dev_iram(dmab, size);
197 /* Internal memory might have limited size and no enough space,
198 * so if we fail to malloc, try to fetch memory traditionally.
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);
206 #ifdef CONFIG_SND_DMA_SGBUF
207 case SNDRV_DMA_TYPE_DEV_SG:
208 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
212 pr_err("snd-malloc: invalid device type %d\n", type);
222 EXPORT_SYMBOL(snd_dma_alloc_pages);
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
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
236 * Return: Zero if the buffer with the given size is allocated successfully,
237 * otherwise a negative value on error.
239 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
240 struct snd_dma_buffer *dmab)
244 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
248 if (size <= PAGE_SIZE)
250 aligned_size = PAGE_SIZE << get_order(size);
251 if (size != aligned_size)
260 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
264 * snd_dma_free_pages - release the allocated buffer
265 * @dmab: the buffer allocation record to release
267 * Releases the allocated buffer via snd_dma_alloc_pages().
269 void snd_dma_free_pages(struct snd_dma_buffer *dmab)
271 switch (dmab->dev.type) {
272 case SNDRV_DMA_TYPE_CONTINUOUS:
273 snd_free_pages(dmab->area, dmab->bytes);
275 #ifdef CONFIG_HAS_DMA
276 #ifdef CONFIG_GENERIC_ALLOCATOR
277 case SNDRV_DMA_TYPE_DEV_IRAM:
278 snd_free_dev_iram(dmab);
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);
285 #ifdef CONFIG_SND_DMA_SGBUF
286 case SNDRV_DMA_TYPE_DEV_SG:
287 snd_free_sgbuf_pages(dmab);
291 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
294 EXPORT_SYMBOL(snd_dma_free_pages);