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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/*3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>4 * Takashi Iwai <tiwai@suse.de>5 * 6 * Generic memory allocators7 */8 9#ifndef __SOUND_MEMALLOC_H10#define __SOUND_MEMALLOC_H11 12#include <linux/dma-direction.h>13#include <asm/page.h>14 15struct device;16struct vm_area_struct;17struct sg_table;18 19/*20 * buffer device info21 */22struct snd_dma_device {23 int type; /* SNDRV_DMA_TYPE_XXX */24 enum dma_data_direction dir; /* DMA direction */25 bool need_sync; /* explicit sync needed? */26 struct device *dev; /* generic device */27};28 29/*30 * buffer types31 */32#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */33#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */34#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */35#define SNDRV_DMA_TYPE_DEV_WC 5 /* continuous write-combined */36#ifdef CONFIG_GENERIC_ALLOCATOR37#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */38#else39#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV40#endif41#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */42#define SNDRV_DMA_TYPE_NONCONTIG 8 /* non-coherent SG buffer */43#define SNDRV_DMA_TYPE_NONCOHERENT 9 /* non-coherent buffer */44#ifdef CONFIG_SND_DMA_SGBUF45#define SNDRV_DMA_TYPE_DEV_SG 3 /* S/G pages */46#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */47#else48#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */49#define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC50#endif51 52/*53 * info for buffer allocation54 */55struct 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 * return the pages matching with the given byte size65 */66static inline unsigned int snd_sgbuf_aligned_pages(size_t size)67{68 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;69}70 71/* allocate/release a buffer */72int snd_dma_alloc_dir_pages(int type, struct device *dev,73 enum dma_data_direction dir, size_t size,74 struct snd_dma_buffer *dmab);75 76static inline int snd_dma_alloc_pages(int type, struct device *dev,77 size_t size, struct snd_dma_buffer *dmab)78{79 return snd_dma_alloc_dir_pages(type, dev, DMA_BIDIRECTIONAL, size, dmab);80}81 82int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,83 struct snd_dma_buffer *dmab);84void snd_dma_free_pages(struct snd_dma_buffer *dmab);85int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,86 struct vm_area_struct *area);87 88enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE };89#ifdef CONFIG_HAS_DMA90void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,91 enum snd_dma_sync_mode mode);92#else93static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,94 enum snd_dma_sync_mode mode) {}95#endif96 97dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);98struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);99unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,100 unsigned int ofs, unsigned int size);101 102/* device-managed memory allocator */103struct snd_dma_buffer *snd_devm_alloc_dir_pages(struct device *dev, int type,104 enum dma_data_direction dir,105 size_t size);106 107static inline struct snd_dma_buffer *108snd_devm_alloc_pages(struct device *dev, int type, size_t size)109{110 return snd_devm_alloc_dir_pages(dev, type, DMA_BIDIRECTIONAL, size);111}112 113static inline struct sg_table *114snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab)115{116 return dmab->private_data;117}118 119#endif /* __SOUND_MEMALLOC_H */120 121