Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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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#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#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
51
52/*
53 * info for buffer allocation
54 */
55struct snd_dma_buffer {
56 struct snd_dma_device dev; /* device type */
57 unsigned char *area; /* virtual pointer */
58 dma_addr_t addr; /* physical address */
59 size_t bytes; /* buffer size in bytes */
60 void *private_data; /* private for allocator; don't touch */
61};
62
63/*
64 * Scatter-Gather generic device pages
65 */
66void *snd_malloc_sgbuf_pages(struct device *device,
67 size_t size, struct snd_dma_buffer *dmab,
68 size_t *res_size);
69int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
70
71struct snd_sg_page {
72 void *buf;
73 dma_addr_t addr;
74};
75
76struct snd_sg_buf {
77 int size; /* allocated byte size */
78 int pages; /* allocated pages */
79 int tblsize; /* allocated table size */
80 struct snd_sg_page *table; /* address table */
81 struct page **page_table; /* page table (for vmap/vunmap) */
82 struct device *dev;
83};
84
85/*
86 * return the pages matching with the given byte size
87 */
88static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
89{
90 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
91}
92
93/*
94 * return the physical address at the corresponding offset
95 */
96static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
97{
98 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
99 addr &= PAGE_MASK;
100 return addr + offset % PAGE_SIZE;
101}
102
103/*
104 * return the virtual address at the corresponding offset
105 */
106static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset)
107{
108 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
109}
110
111/* allocate/release a buffer */
112int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
113 struct snd_dma_buffer *dmab);
114int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
115 struct snd_dma_buffer *dmab);
116void snd_dma_free_pages(struct snd_dma_buffer *dmab);
117
118/* buffer-preservation managements */
119
120#define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
121
122size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
123int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
124
125/* basic memory allocation functions */
126void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
127void snd_free_pages(void *ptr, size_t size);
128
129#endif /* __SOUND_MEMALLOC_H */
130