Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Takashi Iwai <tiwai@suse.de>
5 *
6 * Generic memory allocators
7 */
8
9#ifndef __SOUND_MEMALLOC_H
10#define __SOUND_MEMALLOC_H
11
12#include <asm/page.h>
13
14struct device;
15struct vm_area_struct;
16
17/*
18 * buffer device info
19 */
20struct snd_dma_device {
21 int type; /* SNDRV_DMA_TYPE_XXX */
22 struct device *dev; /* generic device */
23};
24
25#define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
26
27
28/*
29 * buffer types
30 */
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 */
38#else
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
41#endif
42#ifdef CONFIG_GENERIC_ALLOCATOR
43#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
44#else
45#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
46#endif
47#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
48
49/*
50 * info for buffer allocation
51 */
52struct 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 */
58};
59
60/*
61 * return the pages matching with the given byte size
62 */
63static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
64{
65 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
66}
67
68/* allocate/release a buffer */
69int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
70 struct snd_dma_buffer *dmab);
71int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
72 struct snd_dma_buffer *dmab);
73void snd_dma_free_pages(struct snd_dma_buffer *dmab);
74int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
75 struct vm_area_struct *area);
76
77dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);
78struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);
79unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
80 unsigned int ofs, unsigned int size);
81
82/* device-managed memory allocator */
83struct snd_dma_buffer *snd_devm_alloc_pages(struct device *dev, int type,
84 size_t size);
85
86#endif /* __SOUND_MEMALLOC_H */
87