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
27struct device;
28
29/*
30 * buffer device info
31 */
32struct snd_dma_device {
33 int type; /* SNDRV_DMA_TYPE_XXX */
34 struct device *dev; /* generic device */
35};
36
37#define snd_dma_pci_data(pci) (&(pci)->dev)
38#define snd_dma_isa_data() NULL
39#define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
40
41
42/*
43 * buffer types
44 */
45#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
46#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
47#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
48#ifdef CONFIG_SND_DMA_SGBUF
49#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
50#else
51#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
52#endif
53#ifdef CONFIG_GENERIC_ALLOCATOR
54#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
55#else
56#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
57#endif
58
59/*
60 * info for buffer allocation
61 */
62struct snd_dma_buffer {
63 struct snd_dma_device dev; /* device type */
64 unsigned char *area; /* virtual pointer */
65 dma_addr_t addr; /* physical address */
66 size_t bytes; /* buffer size in bytes */
67 void *private_data; /* private for allocator; don't touch */
68};
69
70#ifdef CONFIG_SND_DMA_SGBUF
71/*
72 * Scatter-Gather generic device pages
73 */
74void *snd_malloc_sgbuf_pages(struct device *device,
75 size_t size, struct snd_dma_buffer *dmab,
76 size_t *res_size);
77int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
78
79struct snd_sg_page {
80 void *buf;
81 dma_addr_t addr;
82};
83
84struct snd_sg_buf {
85 int size; /* allocated byte size */
86 int pages; /* allocated pages */
87 int tblsize; /* allocated table size */
88 struct snd_sg_page *table; /* address table */
89 struct page **page_table; /* page table (for vmap/vunmap) */
90 struct device *dev;
91};
92
93/*
94 * return the pages matching with the given byte size
95 */
96static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
97{
98 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
99}
100
101/*
102 * return the physical address at the corresponding offset
103 */
104static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
105 size_t offset)
106{
107 struct snd_sg_buf *sgbuf = dmab->private_data;
108 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
109 addr &= ~((dma_addr_t)PAGE_SIZE - 1);
110 return addr + offset % PAGE_SIZE;
111}
112
113/*
114 * return the virtual address at the corresponding offset
115 */
116static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
117 size_t offset)
118{
119 struct snd_sg_buf *sgbuf = dmab->private_data;
120 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
121}
122
123unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
124 unsigned int ofs, unsigned int size);
125#else
126/* non-SG versions */
127static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
128 size_t offset)
129{
130 return dmab->addr + offset;
131}
132
133static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
134 size_t offset)
135{
136 return dmab->area + offset;
137}
138
139#define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
140
141#endif /* CONFIG_SND_DMA_SGBUF */
142
143/* allocate/release a buffer */
144int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
145 struct snd_dma_buffer *dmab);
146int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
147 struct snd_dma_buffer *dmab);
148void snd_dma_free_pages(struct snd_dma_buffer *dmab);
149
150/* basic memory allocation functions */
151void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
152void snd_free_pages(void *ptr, size_t size);
153
154#endif /* __SOUND_MEMALLOC_H */
155