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 /* 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 3 /* S/G pages */ 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 52 /* 53 * info for buffer allocation 54 */ 55 struct 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 size 65 */ 66 static 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 */ 72 int 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 76 static 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 82 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 83 struct snd_dma_buffer *dmab); 84 void snd_dma_free_pages(struct snd_dma_buffer *dmab); 85 int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab, 86 struct vm_area_struct *area); 87 88 enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE }; 89 #ifdef CONFIG_HAS_DMA 90 void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, 91 enum snd_dma_sync_mode mode); 92 #else 93 static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, 94 enum snd_dma_sync_mode mode) {} 95 #endif 96 97 dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset); 98 struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset); 99 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 100 unsigned int ofs, unsigned int size); 101 102 /* device-managed memory allocator */ 103 struct snd_dma_buffer *snd_devm_alloc_dir_pages(struct device *dev, int type, 104 enum dma_data_direction dir, 105 size_t size); 106 107 static inline struct snd_dma_buffer * 108 snd_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 } 112 113 static inline struct sg_table * 114 snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab) 115 { 116 return dmab->private_data; 117 } 118 119 #endif /* __SOUND_MEMALLOC_H */ 120 121