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