root/include/sound/memalloc.h

INCLUDED FROM

DEFINITIONS

1. snd_sgbuf_aligned_pages
2. snd_sgbuf_get_addr
3. snd_sgbuf_get_ptr
4. snd_sgbuf_get_addr
5. snd_sgbuf_get_ptr

   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 
  16 /*
  17  * buffer device info
  18  */
  19 struct snd_dma_device {
  20         int type;                       /* SNDRV_DMA_TYPE_XXX */
  21         struct device *dev;             /* generic device */
  22 };
  23 
  24 #define snd_dma_pci_data(pci)   (&(pci)->dev)
  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_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 */
  38 #else
  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
  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 
  48 /*
  49  * info for buffer allocation
  50  */
  51 struct 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 
  59 /*
  60  * return the pages matching with the given byte size
  61  */
  62 static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
  63 {
  64         return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
  65 }
  66 
  67 #ifdef CONFIG_SND_DMA_SGBUF
  68 /*
  69  * Scatter-Gather generic device pages
  70  */
  71 void *snd_malloc_sgbuf_pages(struct device *device,
  72                              size_t size, struct snd_dma_buffer *dmab,
  73                              size_t *res_size);
  74 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
  75 
  76 struct snd_sg_page {
  77         void *buf;
  78         dma_addr_t addr;
  79 };
  80 
  81 struct 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 /*
  91  * return the physical address at the corresponding offset
  92  */
  93 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
  94                                            size_t offset)
  95 {
  96         struct snd_sg_buf *sgbuf = dmab->private_data;
  97         dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
  98         addr &= ~((dma_addr_t)PAGE_SIZE - 1);
  99         return addr + offset % PAGE_SIZE;
 100 }
 101 
 102 /*
 103  * return the virtual address at the corresponding offset
 104  */
 105 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
 106                                      size_t offset)
 107 {
 108         struct snd_sg_buf *sgbuf = dmab->private_data;
 109         return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
 110 }
 111 
 112 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
 113                                       unsigned int ofs, unsigned int size);
 114 #else
 115 /* non-SG versions */
 116 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
 117                                             size_t offset)
 118 {
 119         return dmab->addr + offset;
 120 }
 121 
 122 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
 123                                       size_t offset)
 124 {
 125         return dmab->area + offset;
 126 }
 127 
 128 #define snd_sgbuf_get_chunk_size(dmab, ofs, size)       (size)
 129 
 130 #endif /* CONFIG_SND_DMA_SGBUF */
 131 
 132 /* allocate/release a buffer */
 133 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
 134                         struct snd_dma_buffer *dmab);
 135 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
 136                                  struct snd_dma_buffer *dmab);
 137 void snd_dma_free_pages(struct snd_dma_buffer *dmab);
 138 
 139 #endif /* __SOUND_MEMALLOC_H */
 140