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_pci_data(pci) (&(pci)->dev) 25 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x)) 26 27 28 /* 29 * buffer types 30 */ 31 #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */ 32 #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */ 33 #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */ 34 #define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */ 35 #ifdef CONFIG_SND_DMA_SGBUF 36 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ 37 #define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */ 38 #else 39 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ 40 #define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC 41 #endif 42 #ifdef CONFIG_GENERIC_ALLOCATOR 43 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ 44 #else 45 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV 46 #endif 47 #define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */ 48 49 /* 50 * info for buffer allocation 51 */ 52 struct snd_dma_buffer { 53 struct snd_dma_device dev; /* device type */ 54 unsigned char *area; /* virtual pointer */ 55 dma_addr_t addr; /* physical address */ 56 size_t bytes; /* buffer size in bytes */ 57 void *private_data; /* private for allocator; don't touch */ 58 }; 59 60 /* 61 * return the pages matching with the given byte size 62 */ 63 static inline unsigned int snd_sgbuf_aligned_pages(size_t size) 64 { 65 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 66 } 67 68 #ifdef CONFIG_SND_DMA_SGBUF 69 /* 70 * Scatter-Gather generic device pages 71 */ 72 void *snd_malloc_sgbuf_pages(struct device *device, 73 size_t size, struct snd_dma_buffer *dmab, 74 size_t *res_size); 75 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); 76 77 struct snd_sg_page { 78 void *buf; 79 dma_addr_t addr; 80 }; 81 82 struct snd_sg_buf { 83 int size; /* allocated byte size */ 84 int pages; /* allocated pages */ 85 int tblsize; /* allocated table size */ 86 struct snd_sg_page *table; /* address table */ 87 struct page **page_table; /* page table (for vmap/vunmap) */ 88 struct device *dev; 89 }; 90 91 /* 92 * return the physical address at the corresponding offset 93 */ 94 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 95 size_t offset) 96 { 97 struct snd_sg_buf *sgbuf = dmab->private_data; 98 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; 99 addr &= ~((dma_addr_t)PAGE_SIZE - 1); 100 return addr + offset % PAGE_SIZE; 101 } 102 103 /* 104 * return the virtual address at the corresponding offset 105 */ 106 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 107 size_t offset) 108 { 109 struct snd_sg_buf *sgbuf = dmab->private_data; 110 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; 111 } 112 113 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 114 unsigned int ofs, unsigned int size); 115 #else 116 /* non-SG versions */ 117 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 118 size_t offset) 119 { 120 return dmab->addr + offset; 121 } 122 123 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 124 size_t offset) 125 { 126 return dmab->area + offset; 127 } 128 129 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size) 130 131 #endif /* CONFIG_SND_DMA_SGBUF */ 132 133 /* allocate/release a buffer */ 134 int snd_dma_alloc_pages(int type, struct device *dev, size_t size, 135 struct snd_dma_buffer *dmab); 136 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 137 struct snd_dma_buffer *dmab); 138 void snd_dma_free_pages(struct snd_dma_buffer *dmab); 139 140 #endif /* __SOUND_MEMALLOC_H */ 141 142