projects/linux·blob v3.3 · refs

136 lines · 3.9 KiB

1/*
2 * Copyright (c) by Jaroslav Kysela <[email protected]>
3 * Takashi Iwai <[email protected]>
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#ifndef snd_dma_pci_data
38#define snd_dma_pci_data(pci) (&(pci)->dev)
39#define snd_dma_isa_data() NULL
40#define snd_dma_continuous_data(x) ((struct device *)(unsigned long)(x))
41#endif
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#ifdef CONFIG_SND_DMA_SGBUF
51#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
52#else
53#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
54#endif
55
56/*
57 * info for buffer allocation
58 */
59struct snd_dma_buffer {
60 struct snd_dma_device dev; /* device type */
61 unsigned char *area; /* virtual pointer */
62 dma_addr_t addr; /* physical address */
63 size_t bytes; /* buffer size in bytes */
64 void *private_data; /* private for allocator; don't touch */
65};
66
67#ifdef CONFIG_SND_DMA_SGBUF
68/*
69 * Scatter-Gather generic device pages
70 */
71void *snd_malloc_sgbuf_pages(struct device *device,
72 size_t size, struct snd_dma_buffer *dmab,
73 size_t *res_size);
74int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
75
76struct snd_sg_page {
77 void *buf;
78 dma_addr_t addr;
79};
80
81struct snd_sg_buf {
82 int size; /* allocated byte size */
83 int pages; /* allocated pages */
84 int tblsize; /* allocated table size */
85 struct snd_sg_page *table; /* address table */
86 struct page **page_table; /* page table (for vmap/vunmap) */
87 struct device *dev;
88};
89
90/*
91 * return the pages matching with the given byte size
92 */
93static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
94{
95 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
96}
97
98/*
99 * return the physical address at the corresponding offset
100 */
101static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
102{
103 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
104 addr &= PAGE_MASK;
105 return addr + offset % PAGE_SIZE;
106}
107
108/*
109 * return the virtual address at the corresponding offset
110 */
111static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset)
112{
113 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
114}
115#endif /* CONFIG_SND_DMA_SGBUF */
116
117/* allocate/release a buffer */
118int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
119 struct snd_dma_buffer *dmab);
120int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
121 struct snd_dma_buffer *dmab);
122void snd_dma_free_pages(struct snd_dma_buffer *dmab);
123
124/* buffer-preservation managements */
125
126#define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
127
128size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
129int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
130
131/* basic memory allocation functions */
132void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
133void snd_free_pages(void *ptr, size_t size);
134
135#endif /* __SOUND_MEMALLOC_H */
136