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 51 enum dma_data_direction { 52 DMA_BIDIRECTIONAL = 0, 53 DMA_TO_DEVICE = 1, 54 DMA_FROM_DEVICE = 2, 55 DMA_NONE = 3, 56 }; 57 58 struct dma_map_ops { 59 void* (*alloc_coherent)(struct device *dev, size_t size, 60 dma_addr_t *dma_handle, gfp_t gfp); 61 void (*free_coherent)(struct device *dev, size_t size, 62 void *vaddr, dma_addr_t dma_handle); 63 dma_addr_t (*map_page)(struct device *dev, struct page *page, 64 unsigned long offset, size_t size, enum dma_data_direction dir, 65 struct dma_attrs *attrs); 66 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, 67 size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); 68 int (*map_sg)(struct device *dev, struct scatterlist *sg, 69 int nents, enum dma_data_direction dir, struct dma_attrs *attrs); 70 void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, 71 enum dma_data_direction dir, struct dma_attrs *attrs); 72 void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle, 73 size_t size, enum dma_data_direction dir); 74 void (*sync_single_for_device)(struct device *dev, 75 dma_addr_t dma_handle, size_t size, enum dma_data_direction dir); 76 void (*sync_single_range_for_cpu)(struct device *dev, 77 dma_addr_t dma_handle, unsigned long offset, size_t size, 78 enum dma_data_direction dir); 79 void (*sync_single_range_for_device)(struct device *dev, 80 dma_addr_t dma_handle, unsigned long offset, size_t size, 81 enum dma_data_direction dir); 82 void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, 83 int nents, enum dma_data_direction dir); 84 void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg, 85 int nents, enum dma_data_direction dir); 86 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr); 87 int (*dma_supported)(struct device *dev, u64 mask); 88 int is_phys; 89 }; 90 91 #define DMA_BIT_MASK(n) ((2ULL << ((n) - 1)) - 1ULL) 92 93 static inline int 94 dma_supported(struct device *dev, u64 mask) 95 { 96 97 /* XXX busdma takes care of this elsewhere. */ 98 return (1); 99 } 100 101 static inline int 102 dma_set_mask(struct device *dev, u64 dma_mask) 103 { 104 105 if (!dev->dma_mask || !dma_supported(dev, dma_mask)) 106 return -EIO; 107 108 *dev->dma_mask = dma_mask; 109 return (0); 110 } 111 112 static inline int 113 dma_set_coherent_mask(struct device *dev, u64 mask) 114 { 115 116 if (!dma_supported(dev, mask)) 117 return -EIO; 118 /* XXX Currently we don't support a separate coherent mask. */ 119 return 0; 120 } 121 122 static inline void * 123 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 124 gfp_t flag) 125 { 126 vm_paddr_t high; 127 size_t align; 128 void *mem; 129 130 if (dev != NULL && dev->dma_mask) 131 high = *dev->dma_mask; 132 else if (flag & GFP_DMA32) 133 high = BUS_SPACE_MAXADDR_32BIT; 134 else 135 high = BUS_SPACE_MAXADDR; 136 align = PAGE_SIZE << get_order(size); 137 mem = (void *)kmem_alloc_contig(size, flag, 0, high, align, 0, 138 VM_MEMATTR_DEFAULT); 139 if (mem) 140 *dma_handle = vtophys(mem); 141 else 142 *dma_handle = 0; 143 return (mem); 144 } 145 146 static inline void * 147 dma_zalloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 148 gfp_t flag) 149 { 150 151 return (dma_alloc_coherent(dev, size, dma_handle, flag | __GFP_ZERO)); 152 } 153 154 static inline void 155 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, 156 dma_addr_t dma_handle) 157 { 158 159 kmem_free((vm_offset_t)cpu_addr, size); 160 } 161 162 /* XXX This only works with no iommu. */ 163 static inline dma_addr_t 164 dma_map_single_attrs(struct device *dev, void *ptr, size_t size, 165 enum dma_data_direction dir, struct dma_attrs *attrs) 166 { 167 168 return vtophys(ptr); 169 } 170 171 static inline void 172 dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, size_t size, 173 enum dma_data_direction dir, struct dma_attrs *attrs) 174 { 175 } 176 177 static inline int 178 dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nents, 179 enum dma_data_direction dir, struct dma_attrs *attrs) 180 { 181 struct scatterlist *sg; 182 int i; 183 184 for_each_sg(sgl, sg, nents, i) 185 sg_dma_address(sg) = sg_phys(sg); 186 187 return (nents); 188 } 189 190 static inline void 191 dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, 192 enum dma_data_direction dir, struct dma_attrs *attrs) 193 { 194 } 195 196 static inline dma_addr_t 197 dma_map_page(struct device *dev, struct page *page, 198 unsigned long offset, size_t size, enum dma_data_direction direction) 199 { 200 201 return VM_PAGE_TO_PHYS(page) + offset; 202 } 203 204 static inline void 205 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, 206 enum dma_data_direction direction) 207 { 208 } 209 210 static inline void 211 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, 212 enum dma_data_direction direction) 213 { 214 } 215 216 static inline void 217 dma_sync_single(struct device *dev, dma_addr_t addr, size_t size, 218 enum dma_data_direction dir) 219 { 220 dma_sync_single_for_cpu(dev, addr, size, dir); 221 } 222 223 static inline void 224 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, 225 size_t size, enum dma_data_direction direction) 226 { 227 } 228 229 static inline void 230 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, 231 enum dma_data_direction direction) 232 { 233 } 234 235 static inline void 236 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, 237 enum dma_data_direction direction) 238 { 239 } 240 241 static inline void 242 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, 243 unsigned long offset, size_t size, int direction) 244 { 245 } 246 247 static inline void 248 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, 249 unsigned long offset, size_t size, int direction) 250 { 251 } 252 253 static inline int 254 dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 255 { 256 257 return (0); 258 } 259 260 static inline unsigned int dma_set_max_seg_size(struct device *dev, 261 unsigned int size) 262 { 263 return (0); 264 } 265 266 267 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL) 268 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL) 269 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL) 270 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL) 271 272 #define DEFINE_DMA_UNMAP_ADDR(name) dma_addr_t name 273 #define DEFINE_DMA_UNMAP_LEN(name) __u32 name 274 #define dma_unmap_addr(p, name) ((p)->name) 275 #define dma_unmap_addr_set(p, name, v) (((p)->name) = (v)) 276 #define dma_unmap_len(p, name) ((p)->name) 277 #define dma_unmap_len_set(p, name, v) (((p)->name) = (v)) 278 279 extern int uma_align_cache; 280 #define dma_get_cache_alignment() uma_align_cache 281 282 #endif /* _LINUX_DMA_MAPPING_H_ */ 283