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_continuous_data(x) ((struct device *)(__force unsigned long)(x))
41
42
43/*
44 * buffer types
45 */
46#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
47#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
48#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
49#define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */
50#ifdef CONFIG_SND_DMA_SGBUF
51#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
52#define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */
53#else
54#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
55#define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC
56#endif
57#ifdef CONFIG_GENERIC_ALLOCATOR
58#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
59#else
60#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
61#endif
62
63/*
64 * info for buffer allocation
65 */
66struct snd_dma_buffer {
67 struct snd_dma_device dev; /* device type */
68 unsigned char *area; /* virtual pointer */
69 dma_addr_t addr; /* physical address */
70 size_t bytes; /* buffer size in bytes */
71 void *private_data; /* private for allocator; don't touch */
72};
73
74/*
75 * return the pages matching with the given byte size
76 */
77static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
78{
79 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
80}
81
82#ifdef CONFIG_SND_DMA_SGBUF
83/*
84 * Scatter-Gather generic device pages
85 */
86void *snd_malloc_sgbuf_pages(struct device *device,
87 size_t size, struct snd_dma_buffer *dmab,
88 size_t *res_size);
89int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
90
91struct snd_sg_page {
92 void *buf;
93 dma_addr_t addr;
94};
95
96struct snd_sg_buf {
97 int size; /* allocated byte size */
98 int pages; /* allocated pages */
99 int tblsize; /* allocated table size */
100 struct snd_sg_page *table; /* address table */
101 struct page **page_table; /* page table (for vmap/vunmap) */
102 struct device *dev;
103};
104
105/*
106 * return the physical address at the corresponding offset
107 */
108static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
109 size_t offset)
110{
111 struct snd_sg_buf *sgbuf = dmab->private_data;
112 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
113 addr &= ~((dma_addr_t)PAGE_SIZE - 1);
114 return addr + offset % PAGE_SIZE;
115}
116
117/*
118 * return the virtual address at the corresponding offset
119 */
120static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
121 size_t offset)
122{
123 struct snd_sg_buf *sgbuf = dmab->private_data;
124 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
125}
126
127unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
128 unsigned int ofs, unsigned int size);
129#else
130/* non-SG versions */
131static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
132 size_t offset)
133{
134 return dmab->addr + offset;
135}
136
137static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
138 size_t offset)
139{
140 return dmab->area + offset;
141}
142
143#define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
144
145#endif /* CONFIG_SND_DMA_SGBUF */
146
147/* allocate/release a buffer */
148int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
149 struct snd_dma_buffer *dmab);
150int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
151 struct snd_dma_buffer *dmab);
152void snd_dma_free_pages(struct snd_dma_buffer *dmab);
153
154/* basic memory allocation functions */
155void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
156void snd_free_pages(void *ptr, size_t size);
157
158#endif /* __SOUND_MEMALLOC_H */
159