dma-mapping.h revision 219820
1/*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28#ifndef _LINUX_DMA_MAPPING_H_ 29#define _LINUX_DMA_MAPPING_H_ 30 31#include <linux/types.h> 32#include <linux/device.h> 33#include <linux/err.h> 34#include <linux/dma-attrs.h> 35#include <linux/scatterlist.h> 36#include <linux/mm.h> 37#include <linux/page.h> 38 39#include <sys/systm.h> 40#include <sys/malloc.h> 41 42#include <vm/vm.h> 43#include <vm/vm_page.h> 44#include <vm/pmap.h> 45 46#include <machine/bus.h> 47#include <machine/pmap.h> 48 49enum dma_data_direction { 50 DMA_BIDIRECTIONAL = 0, 51 DMA_TO_DEVICE = 1, 52 DMA_FROM_DEVICE = 2, 53 DMA_NONE = 3, 54}; 55 56struct dma_map_ops { 57 void* (*alloc_coherent)(struct device *dev, size_t size, 58 dma_addr_t *dma_handle, gfp_t gfp); 59 void (*free_coherent)(struct device *dev, size_t size, 60 void *vaddr, dma_addr_t dma_handle); 61 dma_addr_t (*map_page)(struct device *dev, struct page *page, 62 unsigned long offset, size_t size, enum dma_data_direction dir, 63 struct dma_attrs *attrs); 64 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, 65 size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); 66 int (*map_sg)(struct device *dev, struct scatterlist *sg, 67 int nents, enum dma_data_direction dir, struct dma_attrs *attrs); 68 void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, 69 enum dma_data_direction dir, struct dma_attrs *attrs); 70 void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle, 71 size_t size, enum dma_data_direction dir); 72 void (*sync_single_for_device)(struct device *dev, 73 dma_addr_t dma_handle, size_t size, enum dma_data_direction dir); 74 void (*sync_single_range_for_cpu)(struct device *dev, 75 dma_addr_t dma_handle, unsigned long offset, size_t size, 76 enum dma_data_direction dir); 77 void (*sync_single_range_for_device)(struct device *dev, 78 dma_addr_t dma_handle, unsigned long offset, size_t size, 79 enum dma_data_direction dir); 80 void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, 81 int nents, enum dma_data_direction dir); 82 void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg, 83 int nents, enum dma_data_direction dir); 84 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr); 85 int (*dma_supported)(struct device *dev, u64 mask); 86 int is_phys; 87}; 88 89#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL << (n)) - 1)) 90 91static inline int 92dma_supported(struct device *dev, u64 mask) 93{ 94 95 /* XXX busdma takes care of this elsewhere. */ 96 return (1); 97} 98 99static inline int 100dma_set_mask(struct device *dev, u64 dma_mask) 101{ 102 103 if (!dev->dma_mask || !dma_supported(dev, dma_mask)) 104 return -EIO; 105 106 *dev->dma_mask = dma_mask; 107 return (0); 108} 109 110static inline int 111dma_set_coherent_mask(struct device *dev, u64 mask) 112{ 113 114 if (!dma_supported(dev, mask)) 115 return -EIO; 116 /* XXX Currently we don't support a seperate coherent mask. */ 117 return 0; 118} 119 120static inline void * 121dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 122 gfp_t flag) 123{ 124 vm_paddr_t high; 125 size_t align; 126 void *mem; 127 128 if (dev->dma_mask) 129 high = *dev->dma_mask; 130 else 131 high = BUS_SPACE_MAXADDR_32BIT; 132 align = PAGE_SIZE << get_order(size); 133 mem = (void *)kmem_alloc_contig(kmem_map, size, flag, 0, high, align, 134 0, VM_MEMATTR_DEFAULT); 135 if (mem) 136 *dma_handle = vtophys(mem); 137 else 138 *dma_handle = 0; 139 return (mem); 140} 141 142static inline void 143dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, 144 dma_addr_t dma_handle) 145{ 146 147 kmem_free(kmem_map, (vm_offset_t)cpu_addr, size); 148} 149 150/* XXX This only works with no iommu. */ 151static inline dma_addr_t 152dma_map_single_attrs(struct device *dev, void *ptr, size_t size, 153 enum dma_data_direction dir, struct dma_attrs *attrs) 154{ 155 156 return vtophys(ptr); 157} 158 159static inline void 160dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, size_t size, 161 enum dma_data_direction dir, struct dma_attrs *attrs) 162{ 163} 164 165static inline int 166dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nents, 167 enum dma_data_direction dir, struct dma_attrs *attrs) 168{ 169 struct scatterlist *sg; 170 int i; 171 172 for_each_sg(sgl, sg, nents, i) 173 sg_dma_address(sg) = sg_phys(sg); 174 175 return (nents); 176} 177 178static inline void 179dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, 180 enum dma_data_direction dir, struct dma_attrs *attrs) 181{ 182} 183 184static inline dma_addr_t 185dma_map_page(struct device *dev, struct page *page, 186 unsigned long offset, size_t size, enum dma_data_direction direction) 187{ 188 189 return VM_PAGE_TO_PHYS(page) + offset; 190} 191 192static inline void 193dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, 194 enum dma_data_direction direction) 195{ 196} 197 198static inline void 199dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, 200 enum dma_data_direction direction) 201{ 202} 203 204static inline void 205dma_sync_single(struct device *dev, dma_addr_t addr, size_t size, 206 enum dma_data_direction dir) 207{ 208 dma_sync_single_for_cpu(dev, addr, size, dir); 209} 210 211static inline void 212dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, 213 size_t size, enum dma_data_direction direction) 214{ 215} 216 217static inline void 218dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, 219 enum dma_data_direction direction) 220{ 221} 222 223static inline void 224dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, 225 enum dma_data_direction direction) 226{ 227} 228 229static inline void 230dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, 231 unsigned long offset, size_t size, int direction) 232{ 233} 234 235static inline void 236dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, 237 unsigned long offset, size_t size, int direction) 238{ 239} 240 241static inline int 242dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 243{ 244 245 return (0); 246} 247 248#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL) 249#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL) 250#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL) 251#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL) 252 253#define DEFINE_DMA_UNMAP_ADDR(name) dma_addr_t name 254#define DEFINE_DMA_UNMAP_LEN(name) __u32 name 255#define dma_unmap_addr(p, name) ((p)->name) 256#define dma_unmap_addr_set(p, name, v) (((p)->name) = (v)) 257#define dma_unmap_len(p, name) ((p)->name) 258#define dma_unmap_len_set(p, name, v) (((p)->name) = (v)) 259 260extern int uma_align_cache; 261#define dma_get_cache_alignment() uma_align_cache 262 263#endif /* _LINUX_DMA_MAPPING_H_ */ 264