Root/include/sound/memalloc.h

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 *)(__force 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#ifdef CONFIG_GENERIC_ALLOCATOR
56#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
57#else
58#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
59#endif
60
61/*
62 * info for buffer allocation
63 */
64struct snd_dma_buffer {
65    struct snd_dma_device dev; /* device type */
66    unsigned char *area; /* virtual pointer */
67    dma_addr_t addr; /* physical address */
68    size_t bytes; /* buffer size in bytes */
69    void *private_data; /* private for allocator; don't touch */
70};
71
72#ifdef CONFIG_SND_DMA_SGBUF
73/*
74 * Scatter-Gather generic device pages
75 */
76void *snd_malloc_sgbuf_pages(struct device *device,
77                 size_t size, struct snd_dma_buffer *dmab,
78                 size_t *res_size);
79int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
80
81struct snd_sg_page {
82    void *buf;
83    dma_addr_t addr;
84};
85
86struct snd_sg_buf {
87    int size; /* allocated byte size */
88    int pages; /* allocated pages */
89    int tblsize; /* allocated table size */
90    struct snd_sg_page *table; /* address table */
91    struct page **page_table; /* page table (for vmap/vunmap) */
92    struct device *dev;
93};
94
95/*
96 * return the pages matching with the given byte size
97 */
98static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
99{
100    return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
101}
102
103/*
104 * return the physical address at the corresponding offset
105 */
106static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
107                       size_t offset)
108{
109    struct snd_sg_buf *sgbuf = dmab->private_data;
110    dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
111    addr &= ~((dma_addr_t)PAGE_SIZE - 1);
112    return addr + offset % PAGE_SIZE;
113}
114
115/*
116 * return the virtual address at the corresponding offset
117 */
118static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
119                     size_t offset)
120{
121    struct snd_sg_buf *sgbuf = dmab->private_data;
122    return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
123}
124
125unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
126                      unsigned int ofs, unsigned int size);
127#else
128/* non-SG versions */
129static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
130                        size_t offset)
131{
132    return dmab->addr + offset;
133}
134
135static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
136                      size_t offset)
137{
138    return dmab->area + offset;
139}
140
141#define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
142
143#endif /* CONFIG_SND_DMA_SGBUF */
144
145/* allocate/release a buffer */
146int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
147            struct snd_dma_buffer *dmab);
148int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
149                                 struct snd_dma_buffer *dmab);
150void snd_dma_free_pages(struct snd_dma_buffer *dmab);
151
152/* buffer-preservation managements */
153
154#define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
155
156size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
157int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
158
159/* basic memory allocation functions */
160void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
161void snd_free_pages(void *ptr, size_t size);
162
163#endif /* __SOUND_MEMALLOC_H */
164
165

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