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/* 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 3 /* S/G pages */
#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
/*
* 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 */
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