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 struct vm_area_struct; 16 17 /* 18 * buffer device info 19 */ 20 struct snd_dma_device { 21 int type; /* SNDRV_DMA_TYPE_XXX */ 22 struct device *dev; /* generic device */ 23 }; 24 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_WC 5 /* continuous write-combined */ 35 #ifdef CONFIG_SND_DMA_SGBUF 36 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ 37 #define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */ 38 #else 39 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ 40 #define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC 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 /* allocate/release a buffer */ 69 int snd_dma_alloc_pages(int type, struct device *dev, size_t size, 70 struct snd_dma_buffer *dmab); 71 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 72 struct snd_dma_buffer *dmab); 73 void snd_dma_free_pages(struct snd_dma_buffer *dmab); 74 int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab, 75 struct vm_area_struct *area); 76 77 dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset); 78 struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset); 79 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 80 unsigned int ofs, unsigned int size); 81 82 /* device-managed memory allocator */ 83 struct snd_dma_buffer *snd_devm_alloc_pages(struct device *dev, int type, 84 size_t size); 85 86 #endif /* __SOUND_MEMALLOC_H */ 87 88