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Thomas Gleixner1a59d1b82019-05-27 08:55:05 +02001/* SPDX-License-Identifier: GPL-2.0-or-later */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * Takashi Iwai <tiwai@suse.de>
5 *
6 * Generic memory allocators
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 */
8
9#ifndef __SOUND_MEMALLOC_H
10#define __SOUND_MEMALLOC_H
11
Takashi Iwai345a9ca2018-07-30 08:46:40 +020012#include <asm/page.h>
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014struct device;
15
16/*
17 * buffer device info
18 */
19struct snd_dma_device {
20 int type; /* SNDRV_DMA_TYPE_XXX */
21 struct device *dev; /* generic device */
22};
23
Antonio Ospite019d80d2013-01-29 12:56:26 +010024#define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26
27/*
28 * buffer types
29 */
30#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
31#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
32#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
Takashi Iwai42e748a2018-08-08 17:01:00 +020033#define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */
Takashi Iwaicc6a8ac2008-06-17 16:39:06 +020034#ifdef CONFIG_SND_DMA_SGBUF
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
Takashi Iwai42e748a2018-08-08 17:01:00 +020036#define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */
Takashi Iwaicc6a8ac2008-06-17 16:39:06 +020037#else
38#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
Takashi Iwai42e748a2018-08-08 17:01:00 +020039#define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC
Takashi Iwaicc6a8ac2008-06-17 16:39:06 +020040#endif
Takashi Iwaia5606f82013-10-24 14:25:32 +020041#ifdef CONFIG_GENERIC_ALLOCATOR
Nicolin Chen05503212013-10-23 11:47:43 +080042#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
Takashi Iwaia5606f82013-10-24 14:25:32 +020043#else
44#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
45#endif
Takashi Iwai1fe7f392019-11-05 09:01:36 +010046#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48/*
49 * info for buffer allocation
50 */
51struct snd_dma_buffer {
52 struct snd_dma_device dev; /* device type */
53 unsigned char *area; /* virtual pointer */
54 dma_addr_t addr; /* physical address */
55 size_t bytes; /* buffer size in bytes */
56 void *private_data; /* private for allocator; don't touch */
57};
58
Pierre-Louis Bossart4cae99d2018-07-25 15:15:56 -050059/*
60 * return the pages matching with the given byte size
61 */
62static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
63{
64 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
65}
66
Takashi Iwaicc6a8ac2008-06-17 16:39:06 +020067#ifdef CONFIG_SND_DMA_SGBUF
Linus Torvalds1da177e2005-04-16 15:20:36 -070068/*
69 * Scatter-Gather generic device pages
70 */
Takashi Iwai77a23f22008-08-21 13:00:13 +020071void *snd_malloc_sgbuf_pages(struct device *device,
72 size_t size, struct snd_dma_buffer *dmab,
73 size_t *res_size);
74int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076struct snd_sg_page {
77 void *buf;
78 dma_addr_t addr;
79};
80
81struct snd_sg_buf {
82 int size; /* allocated byte size */
83 int pages; /* allocated pages */
84 int tblsize; /* allocated table size */
85 struct snd_sg_page *table; /* address table */
86 struct page **page_table; /* page table (for vmap/vunmap) */
87 struct device *dev;
88};
89
90/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 * return the physical address at the corresponding offset
92 */
Takashi Iwai9d069dc2012-09-20 20:29:12 -070093static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
94 size_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Takashi Iwai9d069dc2012-09-20 20:29:12 -070096 struct snd_sg_buf *sgbuf = dmab->private_data;
Takashi Iwai2a1f3362020-06-15 18:00:44 +020097 dma_addr_t addr;
98
99 if (!sgbuf)
100 return dmab->addr + offset;
101 addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
Stefano Panella932e9de2013-12-10 14:20:28 +0000102 addr &= ~((dma_addr_t)PAGE_SIZE - 1);
Takashi Iwai51e9f2e2008-07-30 15:13:33 +0200103 return addr + offset % PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
Takashi Iwai77a23f22008-08-21 13:00:13 +0200106/*
107 * return the virtual address at the corresponding offset
108 */
Takashi Iwai9d069dc2012-09-20 20:29:12 -0700109static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
110 size_t offset)
Takashi Iwai77a23f22008-08-21 13:00:13 +0200111{
Takashi Iwai9d069dc2012-09-20 20:29:12 -0700112 struct snd_sg_buf *sgbuf = dmab->private_data;
Takashi Iwai2a1f3362020-06-15 18:00:44 +0200113
114 if (!sgbuf)
115 return dmab->area + offset;
Takashi Iwai77a23f22008-08-21 13:00:13 +0200116 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
117}
Takashi Iwai9d069dc2012-09-20 20:29:12 -0700118
119unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
120 unsigned int ofs, unsigned int size);
121#else
122/* non-SG versions */
123static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
124 size_t offset)
125{
126 return dmab->addr + offset;
127}
128
129static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
130 size_t offset)
131{
132 return dmab->area + offset;
133}
134
135#define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
136
Takashi Iwaicc6a8ac2008-06-17 16:39:06 +0200137#endif /* CONFIG_SND_DMA_SGBUF */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139/* allocate/release a buffer */
140int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
141 struct snd_dma_buffer *dmab);
142int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
143 struct snd_dma_buffer *dmab);
144void snd_dma_free_pages(struct snd_dma_buffer *dmab);
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146#endif /* __SOUND_MEMALLOC_H */
147