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 allocators 7 */ 8 9#ifndef __SOUND_MEMALLOC_H 10#define __SOUND_MEMALLOC_H 11 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 info 21 */ 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 types 31 */ 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_ALLOCATOR 37#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ 38#else 39#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV 40#endif 41#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_SGBUF 45#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_NONCONTIG 46#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */ 47#else 48#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_WC 50#endif 51/* fallback types, don't use those directly */ 52#ifdef CONFIG_SND_DMA_SGBUF 53#define SNDRV_DMA_TYPE_DEV_SG_FALLBACK 10 54#define SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK 11 55#endif 56 57/* 58 * info for buffer allocation 59 */ 60struct snd_dma_buffer { 61 struct snd_dma_device dev; /* device type */ 62 unsigned char *area; /* virtual pointer */ 63 dma_addr_t addr; /* physical address */ 64 size_t bytes; /* buffer size in bytes */ 65 void *private_data; /* private for allocator; don't touch */ 66}; 67 68/* 69 * return the pages matching with the given byte size 70 */ 71static inline unsigned int snd_sgbuf_aligned_pages(size_t size) 72{ 73 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 74} 75 76/* allocate/release a buffer */ 77int snd_dma_alloc_dir_pages(int type, struct device *dev, 78 enum dma_data_direction dir, size_t size, 79 struct snd_dma_buffer *dmab); 80 81static inline int snd_dma_alloc_pages(int type, struct device *dev, 82 size_t size, struct snd_dma_buffer *dmab) 83{ 84 return snd_dma_alloc_dir_pages(type, dev, DMA_BIDIRECTIONAL, size, dmab); 85} 86 87int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 88 struct snd_dma_buffer *dmab); 89void snd_dma_free_pages(struct snd_dma_buffer *dmab); 90int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab, 91 struct vm_area_struct *area); 92 93enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE }; 94#ifdef CONFIG_HAS_DMA 95void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, 96 enum snd_dma_sync_mode mode); 97#else 98static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, 99 enum snd_dma_sync_mode mode) {} 100#endif 101 102dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset); 103struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset); 104unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 105 unsigned int ofs, unsigned int size); 106 107/* device-managed memory allocator */ 108struct snd_dma_buffer *snd_devm_alloc_dir_pages(struct device *dev, int type, 109 enum dma_data_direction dir, 110 size_t size); 111 112static inline struct snd_dma_buffer * 113snd_devm_alloc_pages(struct device *dev, int type, size_t size) 114{ 115 return snd_devm_alloc_dir_pages(dev, type, DMA_BIDIRECTIONAL, size); 116} 117 118static inline struct sg_table * 119snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab) 120{ 121 return dmab->private_data; 122} 123 124#endif /* __SOUND_MEMALLOC_H */ 125 126