Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Takashi Iwai <tiwai@suse.de>
4 *
5 * Generic memory allocators
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24#ifndef __SOUND_MEMALLOC_H
25#define __SOUND_MEMALLOC_H
26
27#include <asm/page.h>
28
29struct device;
30
31/*
32 * buffer device info
33 */
34struct snd_dma_device {
35 int type; /* SNDRV_DMA_TYPE_XXX */
36 struct device *dev; /* generic device */
37};
38
39#define snd_dma_pci_data(pci) (&(pci)->dev)
40#define snd_dma_isa_data() NULL
41#define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
42
43
44/*
45 * buffer types
46 */
47#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
48#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
49#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
50#define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */
51#ifdef CONFIG_SND_DMA_SGBUF
52#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
53#define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */
54#else
55#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
56#define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC
57#endif
58#ifdef CONFIG_GENERIC_ALLOCATOR
59#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
60#else
61#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
62#endif
63
64/*
65 * info for buffer allocation
66 */
67struct snd_dma_buffer {
68 struct snd_dma_device dev; /* device type */
69 unsigned char *area; /* virtual pointer */
70 dma_addr_t addr; /* physical address */
71 size_t bytes; /* buffer size in bytes */
72 void *private_data; /* private for allocator; don't touch */
73};
74
75/*
76 * return the pages matching with the given byte size
77 */
78static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
79{
80 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
81}
82
83#ifdef CONFIG_SND_DMA_SGBUF
84/*
85 * Scatter-Gather generic device pages
86 */
87void *snd_malloc_sgbuf_pages(struct device *device,
88 size_t size, struct snd_dma_buffer *dmab,
89 size_t *res_size);
90int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
91
92struct snd_sg_page {
93 void *buf;
94 dma_addr_t addr;
95};
96
97struct snd_sg_buf {
98 int size; /* allocated byte size */
99 int pages; /* allocated pages */
100 int tblsize; /* allocated table size */
101 struct snd_sg_page *table; /* address table */
102 struct page **page_table; /* page table (for vmap/vunmap) */
103 struct device *dev;
104};
105
106/*
107 * return the physical address at the corresponding offset
108 */
109static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
110 size_t offset)
111{
112 struct snd_sg_buf *sgbuf = dmab->private_data;
113 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
114 addr &= ~((dma_addr_t)PAGE_SIZE - 1);
115 return addr + offset % PAGE_SIZE;
116}
117
118/*
119 * return the virtual address at the corresponding offset
120 */
121static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
122 size_t offset)
123{
124 struct snd_sg_buf *sgbuf = dmab->private_data;
125 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
126}
127
128unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
129 unsigned int ofs, unsigned int size);
130#else
131/* non-SG versions */
132static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
133 size_t offset)
134{
135 return dmab->addr + offset;
136}
137
138static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
139 size_t offset)
140{
141 return dmab->area + offset;
142}
143
144#define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
145
146#endif /* CONFIG_SND_DMA_SGBUF */
147
148/* allocate/release a buffer */
149int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
150 struct snd_dma_buffer *dmab);
151int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
152 struct snd_dma_buffer *dmab);
153void snd_dma_free_pages(struct snd_dma_buffer *dmab);
154
155/* basic memory allocation functions */
156void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
157void snd_free_pages(void *ptr, size_t size);
158
159#endif /* __SOUND_MEMALLOC_H */
160