memalloc.h 3.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118
  1. /*
  2. * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
  3. * Takashi Iwai <tiwai@suse.de>
  4. *
  5. * Generic memory allocators
  6. *
  7. *
  8. * This program is free software; you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License as published by
  10. * the Free Software Foundation; either version 2 of the License, or
  11. * (at your option) any later version.
  12. *
  13. * This program is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program; if not, write to the Free Software
  20. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21. *
  22. */
  23. #ifndef __SOUND_MEMALLOC_H
  24. #define __SOUND_MEMALLOC_H
  25. struct device;
  26. /*
  27. * buffer device info
  28. */
  29. struct snd_dma_device {
  30. int type; /* SNDRV_DMA_TYPE_XXX */
  31. struct device *dev; /* generic device */
  32. };
  33. #ifndef snd_dma_pci_data
  34. #define snd_dma_pci_data(pci) (&(pci)->dev)
  35. #define snd_dma_isa_data() NULL
  36. #define snd_dma_sbus_data(sbus) ((struct device *)(sbus))
  37. #define snd_dma_continuous_data(x) ((struct device *)(unsigned long)(x))
  38. #endif
  39. /*
  40. * buffer types
  41. */
  42. #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
  43. #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
  44. #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
  45. #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
  46. #define SNDRV_DMA_TYPE_SBUS 4 /* SBUS continuous */
  47. /*
  48. * info for buffer allocation
  49. */
  50. struct snd_dma_buffer {
  51. struct snd_dma_device dev; /* device type */
  52. unsigned char *area; /* virtual pointer */
  53. dma_addr_t addr; /* physical address */
  54. size_t bytes; /* buffer size in bytes */
  55. void *private_data; /* private for allocator; don't touch */
  56. };
  57. /*
  58. * Scatter-Gather generic device pages
  59. */
  60. struct snd_sg_page {
  61. void *buf;
  62. dma_addr_t addr;
  63. };
  64. struct snd_sg_buf {
  65. int size; /* allocated byte size */
  66. int pages; /* allocated pages */
  67. int tblsize; /* allocated table size */
  68. struct snd_sg_page *table; /* address table */
  69. struct page **page_table; /* page table (for vmap/vunmap) */
  70. struct device *dev;
  71. };
  72. /*
  73. * return the pages matching with the given byte size
  74. */
  75. static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
  76. {
  77. return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
  78. }
  79. /*
  80. * return the physical address at the corresponding offset
  81. */
  82. static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
  83. {
  84. return sgbuf->table[offset >> PAGE_SHIFT].addr + offset % PAGE_SIZE;
  85. }
  86. /* allocate/release a buffer */
  87. int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
  88. struct snd_dma_buffer *dmab);
  89. int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
  90. struct snd_dma_buffer *dmab);
  91. void snd_dma_free_pages(struct snd_dma_buffer *dmab);
  92. /* buffer-preservation managements */
  93. #define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
  94. size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
  95. int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
  96. /* basic memory allocation functions */
  97. void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
  98. void snd_free_pages(void *ptr, size_t size);
  99. #endif /* __SOUND_MEMALLOC_H */