1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Takashi Iwai <tiwai@suse.de>
6 * Generic memory allocators
9 #ifndef __SOUND_MEMALLOC_H
10 #define __SOUND_MEMALLOC_H
12 #include <linux/dma-direction.h>
16 struct vm_area_struct;
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 */
29 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
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 */
42 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
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 */
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
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
61 * info for buffer allocation
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 */
72 * return the pages matching with the given byte size
74 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
76 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
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);
84 static inline int snd_dma_alloc_pages(int type, struct device *dev,
85 size_t size, struct snd_dma_buffer *dmab)
87 return snd_dma_alloc_dir_pages(type, dev, DMA_BIDIRECTIONAL, size, dmab);
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);
96 enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE };
98 void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
99 enum snd_dma_sync_mode mode);
101 static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
102 enum snd_dma_sync_mode mode) {}
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);
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,
115 static inline struct snd_dma_buffer *
116 snd_devm_alloc_pages(struct device *dev, int type, size_t size)
118 return snd_devm_alloc_dir_pages(dev, type, DMA_BIDIRECTIONAL, size);
121 static inline struct sg_table *
122 snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab)
124 return dmab->private_data;
127 #endif /* __SOUND_MEMALLOC_H */