126 строки
3.8 KiB
C
126 строки
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
|
|
* Takashi Iwai <tiwai@suse.de>
|
|
*
|
|
* Generic memory allocators
|
|
*/
|
|
|
|
#ifndef __SOUND_MEMALLOC_H
|
|
#define __SOUND_MEMALLOC_H
|
|
|
|
#include <linux/dma-direction.h>
|
|
#include <asm/page.h>
|
|
|
|
struct device;
|
|
struct vm_area_struct;
|
|
struct sg_table;
|
|
|
|
/*
|
|
* buffer device info
|
|
*/
|
|
struct snd_dma_device {
|
|
int type; /* SNDRV_DMA_TYPE_XXX */
|
|
enum dma_data_direction dir; /* DMA direction */
|
|
bool need_sync; /* explicit sync needed? */
|
|
struct device *dev; /* generic device */
|
|
};
|
|
|
|
/*
|
|
* 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_WC 5 /* continuous write-combined */
|
|
#ifdef CONFIG_GENERIC_ALLOCATOR
|
|
#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
|
|
#else
|
|
#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
|
|
#endif
|
|
#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
|
|
#define SNDRV_DMA_TYPE_NONCONTIG 8 /* non-coherent SG buffer */
|
|
#define SNDRV_DMA_TYPE_NONCOHERENT 9 /* non-coherent buffer */
|
|
#ifdef CONFIG_SND_DMA_SGBUF
|
|
#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_NONCONTIG
|
|
#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */
|
|
#else
|
|
#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
|
|
#define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC
|
|
#endif
|
|
/* fallback types, don't use those directly */
|
|
#ifdef CONFIG_SND_DMA_SGBUF
|
|
#define SNDRV_DMA_TYPE_DEV_SG_FALLBACK 10
|
|
#define SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK 11
|
|
#endif
|
|
|
|
/*
|
|
* 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 */
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/* allocate/release a buffer */
|
|
int snd_dma_alloc_dir_pages(int type, struct device *dev,
|
|
enum dma_data_direction dir, size_t size,
|
|
struct snd_dma_buffer *dmab);
|
|
|
|
static inline int snd_dma_alloc_pages(int type, struct device *dev,
|
|
size_t size, struct snd_dma_buffer *dmab)
|
|
{
|
|
return snd_dma_alloc_dir_pages(type, dev, DMA_BIDIRECTIONAL, size, 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);
|
|
int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
|
|
struct vm_area_struct *area);
|
|
|
|
enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE };
|
|
#ifdef CONFIG_HAS_DMA
|
|
void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
|
|
enum snd_dma_sync_mode mode);
|
|
#else
|
|
static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
|
|
enum snd_dma_sync_mode mode) {}
|
|
#endif
|
|
|
|
dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);
|
|
struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);
|
|
unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
|
|
unsigned int ofs, unsigned int size);
|
|
|
|
/* device-managed memory allocator */
|
|
struct snd_dma_buffer *snd_devm_alloc_dir_pages(struct device *dev, int type,
|
|
enum dma_data_direction dir,
|
|
size_t size);
|
|
|
|
static inline struct snd_dma_buffer *
|
|
snd_devm_alloc_pages(struct device *dev, int type, size_t size)
|
|
{
|
|
return snd_devm_alloc_dir_pages(dev, type, DMA_BIDIRECTIONAL, size);
|
|
}
|
|
|
|
static inline struct sg_table *
|
|
snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab)
|
|
{
|
|
return dmab->private_data;
|
|
}
|
|
|
|
#endif /* __SOUND_MEMALLOC_H */
|
|
|