1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Takashi Iwai <tiwai@suse.de>
6 * Generic memory allocators
9 #include <linux/slab.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/genalloc.h>
14 #include <asm/set_memory.h>
16 #include <sound/memalloc.h>
20 * Bus-specific memory allocators
25 /* allocate the coherent DMA pages */
26 static void snd_malloc_dev_pages(struct snd_dma_buffer *dmab, size_t size)
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,
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);
43 /* free the coherent DMA pages */
44 static void snd_free_dev_pages(struct snd_dma_buffer *dmab)
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);
51 dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
54 #ifdef CONFIG_GENERIC_ALLOCATOR
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
60 * This function requires iram phandle provided via of_node
62 static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
64 struct device *dev = dmab->dev.dev;
65 struct gen_pool *pool = NULL;
71 pool = of_gen_pool_get(dev->of_node, "iram", 0);
76 /* Assign the pool into private_data field */
77 dmab->private_data = pool;
79 dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
83 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
84 * @dmab: buffer allocation record to store the allocated data
86 static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
88 struct gen_pool *pool = dmab->private_data;
90 if (pool && dmab->area)
91 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
93 #endif /* CONFIG_GENERIC_ALLOCATOR */
94 #endif /* CONFIG_HAS_DMA */
98 * ALSA generic memory management
102 static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev)
107 return (__force gfp_t)(unsigned long)dev;
111 * snd_dma_alloc_pages - allocate the buffer area according to the given type
112 * @type: the DMA buffer type
113 * @device: the device pointer
114 * @size: the buffer size to allocate
115 * @dmab: buffer allocation record to store the allocated data
117 * Calls the memory-allocator function for the corresponding
120 * Return: Zero if the buffer with the given size is allocated successfully,
121 * otherwise a negative value on error.
123 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
124 struct snd_dma_buffer *dmab)
131 dmab->dev.type = type;
132 dmab->dev.dev = device;
135 case SNDRV_DMA_TYPE_CONTINUOUS:
136 dmab->area = alloc_pages_exact(size,
137 snd_mem_get_gfp_flags(device));
140 #ifdef CONFIG_HAS_DMA
141 #ifdef CONFIG_GENERIC_ALLOCATOR
142 case SNDRV_DMA_TYPE_DEV_IRAM:
143 snd_malloc_dev_iram(dmab, size);
146 /* Internal memory might have limited size and no enough space,
147 * so if we fail to malloc, try to fetch memory traditionally.
149 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
150 #endif /* CONFIG_GENERIC_ALLOCATOR */
152 case SNDRV_DMA_TYPE_DEV:
153 case SNDRV_DMA_TYPE_DEV_UC:
154 snd_malloc_dev_pages(dmab, size);
157 #ifdef CONFIG_SND_DMA_SGBUF
158 case SNDRV_DMA_TYPE_DEV_SG:
159 case SNDRV_DMA_TYPE_DEV_UC_SG:
160 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
164 pr_err("snd-malloc: invalid device type %d\n", type);
174 EXPORT_SYMBOL(snd_dma_alloc_pages);
177 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
178 * @type: the DMA buffer type
179 * @device: the device pointer
180 * @size: the buffer size to allocate
181 * @dmab: buffer allocation record to store the allocated data
183 * Calls the memory-allocator function for the corresponding
184 * buffer type. When no space is left, this function reduces the size and
185 * tries to allocate again. The size actually allocated is stored in
188 * Return: Zero if the buffer with the given size is allocated successfully,
189 * otherwise a negative value on error.
191 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
192 struct snd_dma_buffer *dmab)
196 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
199 if (size <= PAGE_SIZE)
202 size = PAGE_SIZE << get_order(size);
208 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
212 * snd_dma_free_pages - release the allocated buffer
213 * @dmab: the buffer allocation record to release
215 * Releases the allocated buffer via snd_dma_alloc_pages().
217 void snd_dma_free_pages(struct snd_dma_buffer *dmab)
219 switch (dmab->dev.type) {
220 case SNDRV_DMA_TYPE_CONTINUOUS:
221 free_pages_exact(dmab->area, dmab->bytes);
223 #ifdef CONFIG_HAS_DMA
224 #ifdef CONFIG_GENERIC_ALLOCATOR
225 case SNDRV_DMA_TYPE_DEV_IRAM:
226 snd_free_dev_iram(dmab);
228 #endif /* CONFIG_GENERIC_ALLOCATOR */
229 case SNDRV_DMA_TYPE_DEV:
230 case SNDRV_DMA_TYPE_DEV_UC:
231 snd_free_dev_pages(dmab);
234 #ifdef CONFIG_SND_DMA_SGBUF
235 case SNDRV_DMA_TYPE_DEV_SG:
236 case SNDRV_DMA_TYPE_DEV_UC_SG:
237 snd_free_sgbuf_pages(dmab);
241 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
244 EXPORT_SYMBOL(snd_dma_free_pages);