1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_DMA_MAPPING_H_ 32 #define _LINUX_DMA_MAPPING_H_ 33 34 #include <linux/types.h> 35 #include <linux/device.h> 36 #include <linux/err.h> 37 #include <linux/dma-attrs.h> 38 #include <linux/scatterlist.h> 39 #include <linux/mm.h> 40 #include <linux/page.h> 41 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 45 #include <vm/vm.h> 46 #include <vm/vm_page.h> 47 #include <vm/pmap.h> 48 49 #include <machine/bus.h> 50 #include <machine/pmap.h> 51 52 enum dma_data_direction { 53 DMA_BIDIRECTIONAL = 0, 54 DMA_TO_DEVICE = 1, 55 DMA_FROM_DEVICE = 2, 56 DMA_NONE = 3, 57 }; 58 59 struct dma_map_ops { 60 void* (*alloc_coherent)(struct device *dev, size_t size, 61 dma_addr_t *dma_handle, gfp_t gfp); 62 void (*free_coherent)(struct device *dev, size_t size, 63 void *vaddr, dma_addr_t dma_handle); 64 dma_addr_t (*map_page)(struct device *dev, struct page *page, 65 unsigned long offset, size_t size, enum dma_data_direction dir, 66 struct dma_attrs *attrs); 67 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, 68 size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); 69 int (*map_sg)(struct device *dev, struct scatterlist *sg, 70 int nents, enum dma_data_direction dir, struct dma_attrs *attrs); 71 void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, 72 enum dma_data_direction dir, struct dma_attrs *attrs); 73 void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle, 74 size_t size, enum dma_data_direction dir); 75 void (*sync_single_for_device)(struct device *dev, 76 dma_addr_t dma_handle, size_t size, enum dma_data_direction dir); 77 void (*sync_single_range_for_cpu)(struct device *dev, 78 dma_addr_t dma_handle, unsigned long offset, size_t size, 79 enum dma_data_direction dir); 80 void (*sync_single_range_for_device)(struct device *dev, 81 dma_addr_t dma_handle, unsigned long offset, size_t size, 82 enum dma_data_direction dir); 83 void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, 84 int nents, enum dma_data_direction dir); 85 void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg, 86 int nents, enum dma_data_direction dir); 87 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr); 88 int (*dma_supported)(struct device *dev, u64 mask); 89 int is_phys; 90 }; 91 92 #define DMA_BIT_MASK(n) ((2ULL << ((n) - 1)) - 1ULL) 93 94 static inline int 95 dma_supported(struct device *dev, u64 mask) 96 { 97 98 /* XXX busdma takes care of this elsewhere. */ 99 return (1); 100 } 101 102 static inline int 103 dma_set_mask(struct device *dev, u64 dma_mask) 104 { 105 106 if (!dev->dma_mask || !dma_supported(dev, dma_mask)) 107 return -EIO; 108 109 *dev->dma_mask = dma_mask; 110 return (0); 111 } 112 113 static inline int 114 dma_set_coherent_mask(struct device *dev, u64 mask) 115 { 116 117 if (!dma_supported(dev, mask)) 118 return -EIO; 119 /* XXX Currently we don't support a seperate coherent mask. */ 120 return 0; 121 } 122 123 static inline void * 124 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 125 gfp_t flag) 126 { 127 vm_paddr_t high; 128 size_t align; 129 void *mem; 130 131 if (dev->dma_mask) 132 high = *dev->dma_mask; 133 else 134 high = BUS_SPACE_MAXADDR_32BIT; 135 align = PAGE_SIZE << get_order(size); 136 mem = (void *)kmem_alloc_contig(kmem_arena, size, flag, 0, high, align, 137 0, VM_MEMATTR_DEFAULT); 138 if (mem) 139 *dma_handle = vtophys(mem); 140 else 141 *dma_handle = 0; 142 return (mem); 143 } 144 145 static inline void * 146 dma_zalloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 147 gfp_t flag) 148 { 149 150 return (dma_alloc_coherent(dev, size, dma_handle, flag | __GFP_ZERO)); 151 } 152 153 static inline void 154 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, 155 dma_addr_t dma_handle) 156 { 157 158 kmem_free(kmem_arena, (vm_offset_t)cpu_addr, size); 159 } 160 161 /* XXX This only works with no iommu. */ 162 static inline dma_addr_t 163 dma_map_single_attrs(struct device *dev, void *ptr, size_t size, 164 enum dma_data_direction dir, struct dma_attrs *attrs) 165 { 166 167 return vtophys(ptr); 168 } 169 170 static inline void 171 dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, size_t size, 172 enum dma_data_direction dir, struct dma_attrs *attrs) 173 { 174 } 175 176 static inline int 177 dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nents, 178 enum dma_data_direction dir, struct dma_attrs *attrs) 179 { 180 struct scatterlist *sg; 181 int i; 182 183 for_each_sg(sgl, sg, nents, i) 184 sg_dma_address(sg) = sg_phys(sg); 185 186 return (nents); 187 } 188 189 static inline void 190 dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, 191 enum dma_data_direction dir, struct dma_attrs *attrs) 192 { 193 } 194 195 static inline dma_addr_t 196 dma_map_page(struct device *dev, struct page *page, 197 unsigned long offset, size_t size, enum dma_data_direction direction) 198 { 199 200 return VM_PAGE_TO_PHYS(page) + offset; 201 } 202 203 static inline void 204 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, 205 enum dma_data_direction direction) 206 { 207 } 208 209 static inline void 210 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, 211 enum dma_data_direction direction) 212 { 213 } 214 215 static inline void 216 dma_sync_single(struct device *dev, dma_addr_t addr, size_t size, 217 enum dma_data_direction dir) 218 { 219 dma_sync_single_for_cpu(dev, addr, size, dir); 220 } 221 222 static inline void 223 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, 224 size_t size, enum dma_data_direction direction) 225 { 226 } 227 228 static inline void 229 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, 230 enum dma_data_direction direction) 231 { 232 } 233 234 static inline void 235 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, 236 enum dma_data_direction direction) 237 { 238 } 239 240 static inline void 241 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, 242 unsigned long offset, size_t size, int direction) 243 { 244 } 245 246 static inline void 247 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, 248 unsigned long offset, size_t size, int direction) 249 { 250 } 251 252 static inline int 253 dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 254 { 255 256 return (0); 257 } 258 259 static inline unsigned int dma_set_max_seg_size(struct device *dev, 260 unsigned int size) 261 { 262 return (0); 263 } 264 265 266 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL) 267 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL) 268 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL) 269 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL) 270 271 #define DEFINE_DMA_UNMAP_ADDR(name) dma_addr_t name 272 #define DEFINE_DMA_UNMAP_LEN(name) __u32 name 273 #define dma_unmap_addr(p, name) ((p)->name) 274 #define dma_unmap_addr_set(p, name, v) (((p)->name) = (v)) 275 #define dma_unmap_len(p, name) ((p)->name) 276 #define dma_unmap_len_set(p, name, v) (((p)->name) = (v)) 277 278 extern int uma_align_cache; 279 #define dma_get_cache_alignment() uma_align_cache 280 281 #endif /* _LINUX_DMA_MAPPING_H_ */ 282