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 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
30
31
32 /*
33 * buffer types
34 */
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_SND_DMA_SGBUF
40 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
41 #define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */
42 #else
43 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
44 #define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC
45 #endif
46 #ifdef CONFIG_GENERIC_ALLOCATOR
47 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
48 #else
49 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
50 #endif
51 #define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
52 #define SNDRV_DMA_TYPE_NONCONTIG 8 /* non-coherent SG buffer */
53 #define SNDRV_DMA_TYPE_NONCOHERENT 9 /* non-coherent buffer */
54
55 /*
56 * info for buffer allocation
57 */
58 struct snd_dma_buffer {
59 struct snd_dma_device dev; /* device type */
60 unsigned char *area; /* virtual pointer */
61 dma_addr_t addr; /* physical address */
62 size_t bytes; /* buffer size in bytes */
63 void *private_data; /* private for allocator; don't touch */
64 };
65
66 /*
67 * return the pages matching with the given byte size
68 */
snd_sgbuf_aligned_pages(size_t size)69 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
70 {
71 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
72 }
73
74 /* allocate/release a buffer */
75 int snd_dma_alloc_dir_pages(int type, struct device *dev,
76 enum dma_data_direction dir, size_t size,
77 struct snd_dma_buffer *dmab);
78
snd_dma_alloc_pages(int type,struct device * dev,size_t size,struct snd_dma_buffer * dmab)79 static inline int snd_dma_alloc_pages(int type, struct device *dev,
80 size_t size, struct snd_dma_buffer *dmab)
81 {
82 return snd_dma_alloc_dir_pages(type, dev, DMA_BIDIRECTIONAL, size, dmab);
83 }
84
85 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
86 struct snd_dma_buffer *dmab);
87 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
88 int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
89 struct vm_area_struct *area);
90
91 enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE };
92 #ifdef CONFIG_HAS_DMA
93 void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
94 enum snd_dma_sync_mode mode);
95 #else
snd_dma_buffer_sync(struct snd_dma_buffer * dmab,enum snd_dma_sync_mode mode)96 static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
97 enum snd_dma_sync_mode mode) {}
98 #endif
99
100 dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);
101 struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);
102 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
103 unsigned int ofs, unsigned int size);
104
105 /* device-managed memory allocator */
106 struct snd_dma_buffer *snd_devm_alloc_dir_pages(struct device *dev, int type,
107 enum dma_data_direction dir,
108 size_t size);
109
110 static inline struct snd_dma_buffer *
snd_devm_alloc_pages(struct device * dev,int type,size_t size)111 snd_devm_alloc_pages(struct device *dev, int type, size_t size)
112 {
113 return snd_devm_alloc_dir_pages(dev, type, DMA_BIDIRECTIONAL, size);
114 }
115
116 static inline struct sg_table *
snd_dma_noncontig_sg_table(struct snd_dma_buffer * dmab)117 snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab)
118 {
119 return dmab->private_data;
120 }
121
122 #endif /* __SOUND_MEMALLOC_H */
123
124