memalloc.h (3962B)
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#define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x)) 30 31 32/* 33 * buffer types 34 */ 35#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */ 36#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */ 37#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */ 38#define SNDRV_DMA_TYPE_DEV_WC 5 /* continuous write-combined */ 39#ifdef CONFIG_GENERIC_ALLOCATOR 40#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ 41#else 42#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV 43#endif 44#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */ 45#define SNDRV_DMA_TYPE_NONCONTIG 8 /* non-coherent SG buffer */ 46#define SNDRV_DMA_TYPE_NONCOHERENT 9 /* non-coherent buffer */ 47#ifdef CONFIG_SND_DMA_SGBUF 48#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_NONCONTIG 49#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */ 50#else 51#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ 52#define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC 53#endif 54/* fallback types, don't use those directly */ 55#ifdef CONFIG_SND_DMA_SGBUF 56#define SNDRV_DMA_TYPE_DEV_SG_FALLBACK 10 57#define SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK 11 58#endif 59 60/* 61 * info for buffer allocation 62 */ 63struct snd_dma_buffer { 64 struct snd_dma_device dev; /* device type */ 65 unsigned char *area; /* virtual pointer */ 66 dma_addr_t addr; /* physical address */ 67 size_t bytes; /* buffer size in bytes */ 68 void *private_data; /* private for allocator; don't touch */ 69}; 70 71/* 72 * return the pages matching with the given byte size 73 */ 74static inline unsigned int snd_sgbuf_aligned_pages(size_t size) 75{ 76 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 77} 78 79/* allocate/release a buffer */ 80int snd_dma_alloc_dir_pages(int type, struct device *dev, 81 enum dma_data_direction dir, size_t size, 82 struct snd_dma_buffer *dmab); 83 84static inline int snd_dma_alloc_pages(int type, struct device *dev, 85 size_t size, struct snd_dma_buffer *dmab) 86{ 87 return snd_dma_alloc_dir_pages(type, dev, DMA_BIDIRECTIONAL, size, dmab); 88} 89 90int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 91 struct snd_dma_buffer *dmab); 92void snd_dma_free_pages(struct snd_dma_buffer *dmab); 93int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab, 94 struct vm_area_struct *area); 95 96enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE }; 97#ifdef CONFIG_HAS_DMA 98void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, 99 enum snd_dma_sync_mode mode); 100#else 101static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, 102 enum snd_dma_sync_mode mode) {} 103#endif 104 105dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset); 106struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset); 107unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 108 unsigned int ofs, unsigned int size); 109 110/* device-managed memory allocator */ 111struct snd_dma_buffer *snd_devm_alloc_dir_pages(struct device *dev, int type, 112 enum dma_data_direction dir, 113 size_t size); 114 115static inline struct snd_dma_buffer * 116snd_devm_alloc_pages(struct device *dev, int type, size_t size) 117{ 118 return snd_devm_alloc_dir_pages(dev, type, DMA_BIDIRECTIONAL, size); 119} 120 121static inline struct sg_table * 122snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab) 123{ 124 return dmab->private_data; 125} 126 127#endif /* __SOUND_MEMALLOC_H */ 128