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 #ifndef __SOUND_MEMALLOC_H
10 #define __SOUND_MEMALLOC_H
15 struct vm_area_struct;
20 struct snd_dma_device {
21 int type; /* SNDRV_DMA_TYPE_XXX */
22 struct device *dev; /* generic device */
25 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
31 #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
32 #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
33 #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
34 #define SNDRV_DMA_TYPE_DEV_WC 5 /* continuous write-combined */
35 #ifdef CONFIG_SND_DMA_SGBUF
36 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
37 #define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */
39 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
40 #define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC
42 #ifdef CONFIG_GENERIC_ALLOCATOR
43 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
45 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
47 #define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
50 * info for buffer allocation
52 struct snd_dma_buffer {
53 struct snd_dma_device dev; /* device type */
54 unsigned char *area; /* virtual pointer */
55 dma_addr_t addr; /* physical address */
56 size_t bytes; /* buffer size in bytes */
57 void *private_data; /* private for allocator; don't touch */
61 * return the pages matching with the given byte size
63 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
65 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
68 /* allocate/release a buffer */
69 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
70 struct snd_dma_buffer *dmab);
71 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
72 struct snd_dma_buffer *dmab);
73 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
74 int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
75 struct vm_area_struct *area);
77 dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);
78 struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);
79 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
80 unsigned int ofs, unsigned int size);
82 /* device-managed memory allocator */
83 struct snd_dma_buffer *snd_devm_alloc_pages(struct device *dev, int type,
86 #endif /* __SOUND_MEMALLOC_H */