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
19 struct snd_dma_device {
20 int type; /* SNDRV_DMA_TYPE_XXX */
21 struct device *dev; /* generic device */
24 #define snd_dma_pci_data(pci) (&(pci)->dev)
25 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
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_UC 5 /* continuous non-cahced */
35 #ifdef CONFIG_SND_DMA_SGBUF
36 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
37 #define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */
39 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
40 #define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC
42 #ifdef CONFIG_GENERIC_ALLOCATOR
43 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
45 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
47 #define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
50 * info for buffer allocation
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 */
61 * return the pages matching with the given byte size
63 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
65 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
68 #ifdef CONFIG_SND_DMA_SGBUF
70 * Scatter-Gather generic device pages
72 void *snd_malloc_sgbuf_pages(struct device *device,
73 size_t size, struct snd_dma_buffer *dmab,
75 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
83 int size; /* allocated byte size */
84 int pages; /* allocated pages */
85 int tblsize; /* allocated table size */
86 struct snd_sg_page *table; /* address table */
87 struct page **page_table; /* page table (for vmap/vunmap) */
92 * return the physical address at the corresponding offset
94 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
97 struct snd_sg_buf *sgbuf = dmab->private_data;
98 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
99 addr &= ~((dma_addr_t)PAGE_SIZE - 1);
100 return addr + offset % PAGE_SIZE;
104 * return the virtual address at the corresponding offset
106 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
109 struct snd_sg_buf *sgbuf = dmab->private_data;
110 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
113 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
114 unsigned int ofs, unsigned int size);
116 /* non-SG versions */
117 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
120 return dmab->addr + offset;
123 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
126 return dmab->area + offset;
129 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size)
131 #endif /* CONFIG_SND_DMA_SGBUF */
133 /* allocate/release a buffer */
134 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
135 struct snd_dma_buffer *dmab);
136 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
137 struct snd_dma_buffer *dmab);
138 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
140 #endif /* __SOUND_MEMALLOC_H */