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>
13 #include <linux/vmalloc.h>
15 #include <asm/set_memory.h>
17 #include <sound/memalloc.h>
21 * Bus-specific memory allocators
26 /* allocate the coherent DMA pages */
27 static void snd_malloc_dev_pages(struct snd_dma_buffer *dmab, size_t size)
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,
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);
44 /* free the coherent DMA pages */
45 static void snd_free_dev_pages(struct snd_dma_buffer *dmab)
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);
52 dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
55 #ifdef CONFIG_GENERIC_ALLOCATOR
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
61 * This function requires iram phandle provided via of_node
63 static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
65 struct device *dev = dmab->dev.dev;
66 struct gen_pool *pool = NULL;
72 pool = of_gen_pool_get(dev->of_node, "iram", 0);
77 /* Assign the pool into private_data field */
78 dmab->private_data = pool;
80 dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
84 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
85 * @dmab: buffer allocation record to store the allocated data
87 static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
89 struct gen_pool *pool = dmab->private_data;
91 if (pool && dmab->area)
92 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
94 #endif /* CONFIG_GENERIC_ALLOCATOR */
95 #endif /* CONFIG_HAS_DMA */
99 * ALSA generic memory management
103 static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev,
109 return (__force gfp_t)(unsigned long)dev;
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
119 * Calls the memory-allocator function for the corresponding
122 * Return: Zero if the buffer with the given size is allocated successfully,
123 * otherwise a negative value on error.
125 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
126 struct snd_dma_buffer *dmab)
135 dmab->dev.type = type;
136 dmab->dev.dev = device;
140 dmab->private_data = NULL;
142 case SNDRV_DMA_TYPE_CONTINUOUS:
143 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL);
144 dmab->area = alloc_pages_exact(size, gfp);
146 case SNDRV_DMA_TYPE_VMALLOC:
147 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL | __GFP_HIGHMEM);
148 dmab->area = __vmalloc(size, gfp);
150 #ifdef CONFIG_HAS_DMA
151 #ifdef CONFIG_GENERIC_ALLOCATOR
152 case SNDRV_DMA_TYPE_DEV_IRAM:
153 snd_malloc_dev_iram(dmab, size);
156 /* Internal memory might have limited size and no enough space,
157 * so if we fail to malloc, try to fetch memory traditionally.
159 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
160 #endif /* CONFIG_GENERIC_ALLOCATOR */
162 case SNDRV_DMA_TYPE_DEV:
163 case SNDRV_DMA_TYPE_DEV_UC:
164 snd_malloc_dev_pages(dmab, size);
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);
174 pr_err("snd-malloc: invalid device type %d\n", type);
182 EXPORT_SYMBOL(snd_dma_alloc_pages);
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
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
196 * Return: Zero if the buffer with the given size is allocated successfully,
197 * otherwise a negative value on error.
199 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
200 struct snd_dma_buffer *dmab)
204 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
207 if (size <= PAGE_SIZE)
210 size = PAGE_SIZE << get_order(size);
216 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
220 * snd_dma_free_pages - release the allocated buffer
221 * @dmab: the buffer allocation record to release
223 * Releases the allocated buffer via snd_dma_alloc_pages().
225 void snd_dma_free_pages(struct snd_dma_buffer *dmab)
227 switch (dmab->dev.type) {
228 case SNDRV_DMA_TYPE_CONTINUOUS:
229 free_pages_exact(dmab->area, dmab->bytes);
231 case SNDRV_DMA_TYPE_VMALLOC:
234 #ifdef CONFIG_HAS_DMA
235 #ifdef CONFIG_GENERIC_ALLOCATOR
236 case SNDRV_DMA_TYPE_DEV_IRAM:
237 snd_free_dev_iram(dmab);
239 #endif /* CONFIG_GENERIC_ALLOCATOR */
240 case SNDRV_DMA_TYPE_DEV:
241 case SNDRV_DMA_TYPE_DEV_UC:
242 snd_free_dev_pages(dmab);
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);
252 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
255 EXPORT_SYMBOL(snd_dma_free_pages);