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 15 struct device; 16 struct vm_area_struct; 17 struct sg_table; 18 19 /* 20 * buffer device info 21 */ 22 struct 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 */ 63 struct 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 */ 74 static 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 */ 80 int 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 84 static 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 90 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 91 struct snd_dma_buffer *dmab); 92 void snd_dma_free_pages(struct snd_dma_buffer *dmab); 93 int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab, 94 struct vm_area_struct *area); 95 96 enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE }; 97 #ifdef CONFIG_HAS_DMA 98 void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, 99 enum snd_dma_sync_mode mode); 100 #else 101 static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, 102 enum snd_dma_sync_mode mode) {} 103 #endif 104 105 dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset); 106 struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset); 107 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 108 unsigned int ofs, unsigned int size); 109 110 /* device-managed memory allocator */ 111 struct snd_dma_buffer *snd_devm_alloc_dir_pages(struct device *dev, int type, 112 enum dma_data_direction dir, 113 size_t size); 114 115 static inline struct snd_dma_buffer * 116 snd_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 } 120 121 static inline struct sg_table * 122 snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab) 123 { 124 return dmab->private_data; 125 } 126 127 #endif /* __SOUND_MEMALLOC_H */ 128 129