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
14 struct vm_area_struct;
19 struct snd_dma_device {
20 int type; /* SNDRV_DMA_TYPE_XXX */
21 struct device *dev; /* generic device */
24 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
30 #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
31 #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
32 #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
33 #define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */
34 #ifdef CONFIG_SND_DMA_SGBUF
35 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
36 #define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */
38 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
39 #define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC
41 #ifdef CONFIG_GENERIC_ALLOCATOR
42 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
44 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
46 #define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
49 * info for buffer allocation
51 struct snd_dma_buffer {
52 struct snd_dma_device dev; /* device type */
53 unsigned char *area; /* virtual pointer */
54 dma_addr_t addr; /* physical address */
55 size_t bytes; /* buffer size in bytes */
56 void *private_data; /* private for allocator; don't touch */
60 * return the pages matching with the given byte size
62 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
64 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
67 /* allocate/release a buffer */
68 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
69 struct snd_dma_buffer *dmab);
70 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
71 struct snd_dma_buffer *dmab);
72 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
73 int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
74 struct vm_area_struct *area);
76 dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);
77 struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);
78 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
79 unsigned int ofs, unsigned int size);
81 #endif /* __SOUND_MEMALLOC_H */