2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Takashi Iwai <tiwai@suse.de>
5 * Generic memory allocators
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.
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.
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
24 #ifndef __SOUND_MEMALLOC_H
25 #define __SOUND_MEMALLOC_H
32 struct snd_dma_device
{
33 int type
; /* SNDRV_DMA_TYPE_XXX */
34 struct device
*dev
; /* generic device */
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))
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 */
53 * info for buffer allocation
55 struct 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 */
64 * Scatter-Gather generic device pages
66 void *snd_malloc_sgbuf_pages(struct device
*device
,
67 size_t size
, struct snd_dma_buffer
*dmab
,
69 int snd_free_sgbuf_pages(struct snd_dma_buffer
*dmab
);
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) */
86 * return the pages matching with the given byte size
88 static inline unsigned int snd_sgbuf_aligned_pages(size_t size
)
90 return (size
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
94 * return the physical address at the corresponding offset
96 static inline dma_addr_t
snd_sgbuf_get_addr(struct snd_sg_buf
*sgbuf
, size_t offset
)
98 dma_addr_t addr
= sgbuf
->table
[offset
>> PAGE_SHIFT
].addr
;
100 return addr
+ offset
% PAGE_SIZE
;
104 * return the virtual address at the corresponding offset
106 static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf
*sgbuf
, size_t offset
)
108 return sgbuf
->table
[offset
>> PAGE_SHIFT
].buf
+ offset
% PAGE_SIZE
;
111 /* allocate/release a buffer */
112 int snd_dma_alloc_pages(int type
, struct device
*dev
, size_t size
,
113 struct snd_dma_buffer
*dmab
);
114 int snd_dma_alloc_pages_fallback(int type
, struct device
*dev
, size_t size
,
115 struct snd_dma_buffer
*dmab
);
116 void snd_dma_free_pages(struct snd_dma_buffer
*dmab
);
118 /* buffer-preservation managements */
120 #define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
122 size_t snd_dma_get_reserved_buf(struct snd_dma_buffer
*dmab
, unsigned int id
);
123 int snd_dma_reserve_buf(struct snd_dma_buffer
*dmab
, unsigned int id
);
125 /* basic memory allocation functions */
126 void *snd_malloc_pages(size_t size
, gfp_t gfp_flags
);
127 void snd_free_pages(void *ptr
, size_t size
);
129 #endif /* __SOUND_MEMALLOC_H */