[linux-2.6-block.git] / include / sound / memalloc.h

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *                   Takashi Iwai <tiwai@suse.de>
 * 
 *  Generic memory allocators
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#ifndef __SOUND_MEMALLOC_H
#define __SOUND_MEMALLOC_H

struct device;

/*
 * buffer device info
 */
struct snd_dma_device {
	int type;			/* SNDRV_DMA_TYPE_XXX */
	struct device *dev;		/* generic device */
};

#ifndef snd_dma_pci_data
#define snd_dma_pci_data(pci)	(&(pci)->dev)
#define snd_dma_isa_data()	NULL
#define snd_dma_continuous_data(x)	((struct device *)(unsigned long)(x))
#endif


/*
 * buffer types
 */
#define SNDRV_DMA_TYPE_UNKNOWN		0	/* not defined */
#define SNDRV_DMA_TYPE_CONTINUOUS	1	/* continuous no-DMA memory */
#define SNDRV_DMA_TYPE_DEV		2	/* generic device continuous */
#define SNDRV_DMA_TYPE_DEV_SG		3	/* generic device SG-buffer */

/*
 * info for buffer allocation
 */
struct snd_dma_buffer {
	struct snd_dma_device dev;	/* device type */
	unsigned char *area;	/* virtual pointer */
	dma_addr_t addr;	/* physical address */
	size_t bytes;		/* buffer size in bytes */
	void *private_data;	/* private for allocator; don't touch */
};

/*
 * Scatter-Gather generic device pages
 */
void *snd_malloc_sgbuf_pages(struct device *device,
			     size_t size, struct snd_dma_buffer *dmab,
			     size_t *res_size);
int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);

struct snd_sg_page {
	void *buf;
	dma_addr_t addr;
};

struct snd_sg_buf {
	int size;	/* allocated byte size */
	int pages;	/* allocated pages */
	int tblsize;	/* allocated table size */
	struct snd_sg_page *table;	/* address table */
	struct page **page_table;	/* page table (for vmap/vunmap) */
	struct device *dev;
};

/*
 * return the pages matching with the given byte size
 */
static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
{
	return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
}

/*
 * return the physical address at the corresponding offset
 */
static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
{
	dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
	addr &= PAGE_MASK;
	return addr + offset % PAGE_SIZE;
}

/*
 * return the virtual address at the corresponding offset
 */
static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset)
{
	return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
}

/* allocate/release a buffer */
int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
			struct snd_dma_buffer *dmab);
int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
                                 struct snd_dma_buffer *dmab);
void snd_dma_free_pages(struct snd_dma_buffer *dmab);

/* buffer-preservation managements */

#define snd_dma_pci_buf_id(pci)	(((unsigned int)(pci)->vendor << 16) | (pci)->device)

size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);

/* basic memory allocation functions */
void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
void snd_free_pages(void *ptr, size_t size);

#endif /* __SOUND_MEMALLOC_H */
Commit	Line	Data
1da177e4	1	/*
c1017a4c	2	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	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
	27	struct device;
	28
	29	/*
	30	* buffer device info
	31	*/
	32	struct 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
1da177e4 LT	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 */
1da177e4 LT	51
	52	/*
	53	* info for buffer allocation
	54	*/
	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 */
	61	};
	62
	63	/*
	64	* Scatter-Gather generic device pages
	65	*/
77a23f26 TI	66	void snd_malloc_sgbuf_pages(struct device device,
	67	size_t size, struct snd_dma_buffer *dmab,
	68	size_t *res_size);
	69	int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
	70
1da177e4 LT	71	struct snd_sg_page {
	72	void *buf;
	73	dma_addr_t addr;
	74	};
	75
	76	struct 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	*/
	88	static 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	*/
	96	static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
	97	{
51e9f2e6 TI	98	dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
	99	addr &= PAGE_MASK;
	100	return addr + offset % PAGE_SIZE;
1da177e4 LT	101	}
1da177e4 LT	102
77a23f26 TI	103	/*
	104	* return the virtual address at the corresponding offset
	105	*/
	106	static 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	}
1da177e4 LT	110
	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);
	117
	118	/* buffer-preservation managements */
	119
	120	#define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) \| (pci)->device)
	121
	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);
	124
	125	/* basic memory allocation functions */
1ef64e67	126	void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
1da177e4 LT	127	void snd_free_pages(void *ptr, size_t size);
	128
	129	#endif /* __SOUND_MEMALLOC_H */
	130