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 <asm/page.h> 13 14 struct device; 15 16 /* 17 * buffer device info 18 */ 19 struct snd_dma_device { 20 int type; /* SNDRV_DMA_TYPE_XXX */ 21 struct device *dev; /* generic device */ 22 }; 23 24 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x)) 25 26 27 /* 28 * buffer types 29 */ 30 #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */ 31 #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */ 32 #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */ 33 #define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */ 34 #ifdef CONFIG_SND_DMA_SGBUF 35 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ 36 #define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */ 37 #else 38 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ 39 #define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC 40 #endif 41 #ifdef CONFIG_GENERIC_ALLOCATOR 42 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ 43 #else 44 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV 45 #endif 46 #define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */ 47 48 /* 49 * info for buffer allocation 50 */ 51 struct snd_dma_buffer { 52 struct snd_dma_device dev; /* device type */ 53 unsigned char *area; /* virtual pointer */ 54 dma_addr_t addr; /* physical address */ 55 size_t bytes; /* buffer size in bytes */ 56 void *private_data; /* private for allocator; don't touch */ 57 }; 58 59 /* 60 * return the pages matching with the given byte size 61 */ 62 static inline unsigned int snd_sgbuf_aligned_pages(size_t size) 63 { 64 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 65 } 66 67 #ifdef CONFIG_SND_DMA_SGBUF 68 /* 69 * Scatter-Gather generic device pages 70 */ 71 void *snd_malloc_sgbuf_pages(struct device *device, 72 size_t size, struct snd_dma_buffer *dmab, 73 size_t *res_size); 74 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); 75 76 struct snd_sg_page { 77 void *buf; 78 dma_addr_t addr; 79 }; 80 81 struct snd_sg_buf { 82 int size; /* allocated byte size */ 83 int pages; /* allocated pages */ 84 int tblsize; /* allocated table size */ 85 struct snd_sg_page *table; /* address table */ 86 struct page **page_table; /* page table (for vmap/vunmap) */ 87 struct device *dev; 88 }; 89 90 /* 91 * return the physical address at the corresponding offset 92 */ 93 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 94 size_t offset) 95 { 96 struct snd_sg_buf *sgbuf = dmab->private_data; 97 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; 98 addr &= ~((dma_addr_t)PAGE_SIZE - 1); 99 return addr + offset % PAGE_SIZE; 100 } 101 102 /* 103 * return the virtual address at the corresponding offset 104 */ 105 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 106 size_t offset) 107 { 108 struct snd_sg_buf *sgbuf = dmab->private_data; 109 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; 110 } 111 112 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 113 unsigned int ofs, unsigned int size); 114 #else 115 /* non-SG versions */ 116 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 117 size_t offset) 118 { 119 return dmab->addr + offset; 120 } 121 122 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 123 size_t offset) 124 { 125 return dmab->area + offset; 126 } 127 128 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size) 129 130 #endif /* CONFIG_SND_DMA_SGBUF */ 131 132 /* allocate/release a buffer */ 133 int snd_dma_alloc_pages(int type, struct device *dev, size_t size, 134 struct snd_dma_buffer *dmab); 135 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 136 struct snd_dma_buffer *dmab); 137 void snd_dma_free_pages(struct snd_dma_buffer *dmab); 138 139 #endif /* __SOUND_MEMALLOC_H */ 140 141