/* 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 <asm/page.h> struct device; /* * buffer device info */struct snd_dma_device {	int type;			/* SNDRV_DMA_TYPE_XXX */	struct device *dev;		/* generic device */}; #define snd_dma_continuous_data(x)	((struct device *)(__force unsigned long)(x))  /* * 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_UC		5	/* continuous non-cahced */#ifdef CONFIG_SND_DMA_SGBUF#define SNDRV_DMA_TYPE_DEV_SG		3	/* generic device SG-buffer */#define SNDRV_DMA_TYPE_DEV_UC_SG	6	/* SG non-cached */#else#define SNDRV_DMA_TYPE_DEV_SG	SNDRV_DMA_TYPE_DEV /* no SG-buf support */#define SNDRV_DMA_TYPE_DEV_UC_SG	SNDRV_DMA_TYPE_DEV_UC#endif#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 */ /* * 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;} #ifdef CONFIG_SND_DMA_SGBUF/* * 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 physical address at the corresponding offset */static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,					   size_t offset){	struct snd_sg_buf *sgbuf = dmab->private_data;	dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;	addr &= ~((dma_addr_t)PAGE_SIZE - 1);	return addr + offset % PAGE_SIZE;} /* * return the virtual address at the corresponding offset */static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,				     size_t offset){	struct snd_sg_buf *sgbuf = dmab->private_data;	return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;} unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,				      unsigned int ofs, unsigned int size);#else/* non-SG versions */static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,					    size_t offset){	return dmab->addr + offset;} static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,				      size_t offset){	return dmab->area + offset;} #define snd_sgbuf_get_chunk_size(dmab, ofs, size)	(size) #endif /* CONFIG_SND_DMA_SGBUF */ /* 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); #endif /* __SOUND_MEMALLOC_H */