include/sound/memalloc.h

   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 <asm/page.h>
  13
  14 struct device;
  15 struct vm_area_struct;
  16
  17 /*
  18  * buffer device info
  19  */
  20 struct snd_dma_device {
  21         int type;                       /* SNDRV_DMA_TYPE_XXX */
  22         struct device *dev;             /* generic device */
  23 };
  24
  25 #define snd_dma_continuous_data(x)      ((struct device *)(__force unsigned long)(x))
  26
  27
  28 /*
  29  * buffer types
  30  */
  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_WC           5       /* continuous write-combined */
  35 #ifdef CONFIG_SND_DMA_SGBUF
  36 #define SNDRV_DMA_TYPE_DEV_SG           3       /* generic device SG-buffer */
  37 #define SNDRV_DMA_TYPE_DEV_WC_SG        6       /* SG write-combined */
  38 #else
  39 #define SNDRV_DMA_TYPE_DEV_SG   SNDRV_DMA_TYPE_DEV /* no SG-buf support */
  40 #define SNDRV_DMA_TYPE_DEV_WC_SG        SNDRV_DMA_TYPE_DEV_WC
  41 #endif
  42 #ifdef CONFIG_GENERIC_ALLOCATOR
  43 #define SNDRV_DMA_TYPE_DEV_IRAM         4       /* generic device iram-buffer */
  44 #else
  45 #define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
  46 #endif
  47 #define SNDRV_DMA_TYPE_VMALLOC          7       /* vmalloc'ed buffer */
  48
  49 /*
  50  * info for buffer allocation
  51  */
  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 */
  58 };
  59
  60 /*
  61  * return the pages matching with the given byte size
  62  */
  63 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
  64 {
  65         return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
  66 }
  67
  68 /* allocate/release a buffer */
  69 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
  70                         struct snd_dma_buffer *dmab);
  71 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
  72                                  struct snd_dma_buffer *dmab);
  73 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
  74 int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
  75                         struct vm_area_struct *area);
  76
  77 dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);
  78 struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);
  79 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
  80                                       unsigned int ofs, unsigned int size);
  81
  82 /* device-managed memory allocator */
  83 struct snd_dma_buffer *snd_devm_alloc_pages(struct device *dev, int type,
  84                                             size_t size);
  85
  86 #endif /* __SOUND_MEMALLOC_H */
  87