1 /* 2 * Copyright (c) by Jaroslav Kysela <perex@perex.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 24 #ifndef __SOUND_MEMALLOC_H 25 #define __SOUND_MEMALLOC_H 26 27 struct device; 28 29 /* 30 * buffer device info 31 */ 32 struct snd_dma_device { 33 int type; /* SNDRV_DMA_TYPE_XXX */ 34 struct device *dev; /* generic device */ 35 }; 36 37 #ifndef snd_dma_pci_data 38 #define snd_dma_pci_data(pci) (&(pci)->dev) 39 #define snd_dma_isa_data() NULL 40 #define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x)) 41 #endif 42 43 44 /* 45 * buffer types 46 */ 47 #define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */ 48 #define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */ 49 #define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */ 50 #ifdef CONFIG_SND_DMA_SGBUF 51 #define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ 52 #else 53 #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ 54 #endif 55 #define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ 56 57 /* 58 * info for buffer allocation 59 */ 60 struct snd_dma_buffer { 61 struct snd_dma_device dev; /* device type */ 62 unsigned char *area; /* virtual pointer */ 63 dma_addr_t addr; /* physical address */ 64 size_t bytes; /* buffer size in bytes */ 65 void *private_data; /* private for allocator; don't touch */ 66 }; 67 68 #ifdef CONFIG_SND_DMA_SGBUF 69 /* 70 * Scatter-Gather generic device pages 71 */ 72 void *snd_malloc_sgbuf_pages(struct device *device, 73 size_t size, struct snd_dma_buffer *dmab, 74 size_t *res_size); 75 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); 76 77 struct snd_sg_page { 78 void *buf; 79 dma_addr_t addr; 80 }; 81 82 struct snd_sg_buf { 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) */ 88 struct device *dev; 89 }; 90 91 /* 92 * return the pages matching with the given byte size 93 */ 94 static inline unsigned int snd_sgbuf_aligned_pages(size_t size) 95 { 96 return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 97 } 98 99 /* 100 * return the physical address at the corresponding offset 101 */ 102 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 103 size_t offset) 104 { 105 struct snd_sg_buf *sgbuf = dmab->private_data; 106 dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; 107 addr &= PAGE_MASK; 108 return addr + offset % PAGE_SIZE; 109 } 110 111 /* 112 * return the virtual address at the corresponding offset 113 */ 114 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 115 size_t offset) 116 { 117 struct snd_sg_buf *sgbuf = dmab->private_data; 118 return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; 119 } 120 121 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, 122 unsigned int ofs, unsigned int size); 123 #else 124 /* non-SG versions */ 125 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, 126 size_t offset) 127 { 128 return dmab->addr + offset; 129 } 130 131 static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, 132 size_t offset) 133 { 134 return dmab->area + offset; 135 } 136 137 #define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size) 138 139 #endif /* CONFIG_SND_DMA_SGBUF */ 140 141 /* allocate/release a buffer */ 142 int snd_dma_alloc_pages(int type, struct device *dev, size_t size, 143 struct snd_dma_buffer *dmab); 144 int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, 145 struct snd_dma_buffer *dmab); 146 void snd_dma_free_pages(struct snd_dma_buffer *dmab); 147 148 /* buffer-preservation managements */ 149 150 #define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device) 151 152 size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id); 153 int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id); 154 155 /* basic memory allocation functions */ 156 void *snd_malloc_pages(size_t size, gfp_t gfp_flags); 157 void snd_free_pages(void *ptr, size_t size); 158 159 #endif /* __SOUND_MEMALLOC_H */ 160 161