Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/dma-mapping.h
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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 _LINUXKPI_LINUX_DMA_MAPPING_H_ 32 #define _LINUXKPI_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 #include <linux/sizes.h> 42 43 #include <sys/systm.h> 44 #include <sys/malloc.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_page.h> 48 #include <vm/pmap.h> 49 50 #include <machine/bus.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 unsigned long attrs); 67 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, 68 size_t size, enum dma_data_direction dir, unsigned long attrs); 69 int (*map_sg)(struct device *dev, struct scatterlist *sg, 70 int nents, enum dma_data_direction dir, unsigned long attrs); 71 void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, 72 enum dma_data_direction dir, unsigned long 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 int linux_dma_tag_init(struct device *, u64); 95 int linux_dma_tag_init_coherent(struct device *, u64); 96 void *linux_dma_alloc_coherent(struct device *dev, size_t size, 97 dma_addr_t *dma_handle, gfp_t flag); 98 void *linuxkpi_dmam_alloc_coherent(struct device *dev, size_t size, 99 dma_addr_t *dma_handle, gfp_t flag); 100 dma_addr_t linux_dma_map_phys(struct device *dev, vm_paddr_t phys, size_t len); 101 void linux_dma_unmap(struct device *dev, dma_addr_t dma_addr, size_t size); 102 int linux_dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, 103 int nents, enum dma_data_direction dir __unused, 104 unsigned long attrs __unused); 105 void linux_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, 106 int nents __unused, enum dma_data_direction dir __unused, 107 unsigned long attrs __unused); 108 void linuxkpi_dma_sync(struct device *, dma_addr_t, size_t, bus_dmasync_op_t); 109 110 static inline int 111 dma_supported(struct device *dev, u64 dma_mask) 112 { 113 114 /* XXX busdma takes care of this elsewhere. */ 115 return (1); 116 } 117 118 static inline int 119 dma_set_mask(struct device *dev, u64 dma_mask) 120 { 121 122 if (!dev->dma_priv || !dma_supported(dev, dma_mask)) 123 return -EIO; 124 125 return (linux_dma_tag_init(dev, dma_mask)); 126 } 127 128 static inline int 129 dma_set_coherent_mask(struct device *dev, u64 dma_mask) 130 { 131 132 if (!dev->dma_priv || !dma_supported(dev, dma_mask)) 133 return -EIO; 134 135 return (linux_dma_tag_init_coherent(dev, dma_mask)); 136 } 137 138 static inline int 139 dma_set_mask_and_coherent(struct device *dev, u64 dma_mask) 140 { 141 int r; 142 143 r = dma_set_mask(dev, dma_mask); 144 if (r == 0) 145 dma_set_coherent_mask(dev, dma_mask); 146 return (r); 147 } 148 149 static inline void * 150 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 151 gfp_t flag) 152 { 153 return (linux_dma_alloc_coherent(dev, size, dma_handle, flag)); 154 } 155 156 static inline void * 157 dma_zalloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 158 gfp_t flag) 159 { 160 161 return (dma_alloc_coherent(dev, size, dma_handle, flag | __GFP_ZERO)); 162 } 163 164 static inline void * 165 dmam_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 166 gfp_t flag) 167 { 168 169 return (linuxkpi_dmam_alloc_coherent(dev, size, dma_handle, flag)); 170 } 171 172 static inline void 173 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, 174 dma_addr_t dma_addr) 175 { 176 177 linux_dma_unmap(dev, dma_addr, size); 178 kmem_free(cpu_addr, size); 179 } 180 181 static inline dma_addr_t 182 dma_map_page_attrs(struct device *dev, struct page *page, size_t offset, 183 size_t size, enum dma_data_direction dir, unsigned long attrs) 184 { 185 186 return (linux_dma_map_phys(dev, VM_PAGE_TO_PHYS(page) + offset, size)); 187 } 188 189 /* linux_dma_(un)map_sg_attrs does not support attrs yet */ 190 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \ 191 linux_dma_map_sg_attrs(dev, sgl, nents, dir, 0) 192 193 #define dma_unmap_sg_attrs(dev, sg, nents, dir, attrs) \ 194 linux_dma_unmap_sg_attrs(dev, sg, nents, dir, 0) 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 (linux_dma_map_phys(dev, VM_PAGE_TO_PHYS(page) + offset, size)); 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 linux_dma_unmap(dev, dma_address, size); 210 } 211 212 static inline void 213 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma, size_t size, 214 enum dma_data_direction direction) 215 { 216 bus_dmasync_op_t op; 217 218 switch (direction) { 219 case DMA_BIDIRECTIONAL: 220 op = BUS_DMASYNC_POSTREAD; 221 linuxkpi_dma_sync(dev, dma, size, op); 222 op = BUS_DMASYNC_PREREAD; 223 break; 224 case DMA_TO_DEVICE: 225 op = BUS_DMASYNC_POSTWRITE; 226 break; 227 case DMA_FROM_DEVICE: 228 op = BUS_DMASYNC_POSTREAD; 229 break; 230 default: 231 return; 232 } 233 234 linuxkpi_dma_sync(dev, dma, size, op); 235 } 236 237 static inline void 238 dma_sync_single(struct device *dev, dma_addr_t addr, size_t size, 239 enum dma_data_direction dir) 240 { 241 dma_sync_single_for_cpu(dev, addr, size, dir); 242 } 243 244 static inline void 245 dma_sync_single_for_device(struct device *dev, dma_addr_t dma, 246 size_t size, enum dma_data_direction direction) 247 { 248 bus_dmasync_op_t op; 249 250 switch (direction) { 251 case DMA_BIDIRECTIONAL: 252 op = BUS_DMASYNC_PREWRITE; 253 break; 254 case DMA_TO_DEVICE: 255 op = BUS_DMASYNC_PREREAD; 256 break; 257 case DMA_FROM_DEVICE: 258 op = BUS_DMASYNC_PREWRITE; 259 break; 260 default: 261 return; 262 } 263 264 linuxkpi_dma_sync(dev, dma, size, op); 265 } 266 267 static inline void 268 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, 269 enum dma_data_direction direction) 270 { 271 } 272 273 static inline void 274 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, 275 enum dma_data_direction direction) 276 { 277 } 278 279 static inline void 280 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, 281 unsigned long offset, size_t size, int direction) 282 { 283 } 284 285 static inline void 286 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, 287 unsigned long offset, size_t size, int direction) 288 { 289 } 290 291 #define DMA_MAPPING_ERROR (~(dma_addr_t)0) 292 293 static inline int 294 dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 295 { 296 297 if (dma_addr == 0 || dma_addr == DMA_MAPPING_ERROR) 298 return (-ENOMEM); 299 return (0); 300 } 301 302 static inline unsigned int dma_set_max_seg_size(struct device *dev, 303 unsigned int size) 304 { 305 return (0); 306 } 307 308 static inline dma_addr_t 309 _dma_map_single_attrs(struct device *dev, void *ptr, size_t size, 310 enum dma_data_direction direction, unsigned long attrs __unused) 311 { 312 dma_addr_t dma; 313 314 dma = linux_dma_map_phys(dev, vtophys(ptr), size); 315 if (!dma_mapping_error(dev, dma)) 316 dma_sync_single_for_device(dev, dma, size, direction); 317 318 return (dma); 319 } 320 321 static inline void 322 _dma_unmap_single_attrs(struct device *dev, dma_addr_t dma, size_t size, 323 enum dma_data_direction direction, unsigned long attrs __unused) 324 { 325 326 dma_sync_single_for_cpu(dev, dma, size, direction); 327 linux_dma_unmap(dev, dma, size); 328 } 329 330 static inline size_t 331 dma_max_mapping_size(struct device *dev) 332 { 333 334 return (SCATTERLIST_MAX_SEGMENT); 335 } 336 337 #define dma_map_single_attrs(dev, ptr, size, dir, attrs) \ 338 _dma_map_single_attrs(dev, ptr, size, dir, 0) 339 340 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \ 341 _dma_unmap_single_attrs(dev, dma_addr, size, dir, 0) 342 343 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0) 344 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0) 345 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0) 346 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0) 347 348 #define DEFINE_DMA_UNMAP_ADDR(name) dma_addr_t name 349 #define DEFINE_DMA_UNMAP_LEN(name) __u32 name 350 #define dma_unmap_addr(p, name) ((p)->name) 351 #define dma_unmap_addr_set(p, name, v) (((p)->name) = (v)) 352 #define dma_unmap_len(p, name) ((p)->name) 353 #define dma_unmap_len_set(p, name, v) (((p)->name) = (v)) 354 355 extern int uma_align_cache; 356 #define dma_get_cache_alignment() uma_align_cache 357 358 359 static inline int 360 dma_map_sgtable(struct device *dev, struct sg_table *sgt, 361 enum dma_data_direction dir, 362 unsigned long attrs) 363 { 364 int nents; 365 366 nents = dma_map_sg_attrs(dev, sgt->sgl, sgt->nents, dir, attrs); 367 if (nents < 0) 368 return (nents); 369 sgt->nents = nents; 370 return (0); 371 } 372 373 static inline void 374 dma_unmap_sgtable(struct device *dev, struct sg_table *sgt, 375 enum dma_data_direction dir, 376 unsigned long attrs) 377 { 378 379 dma_unmap_sg_attrs(dev, sgt->sgl, sgt->nents, dir, attrs); 380 } 381 382 383 #endif /* _LINUXKPI_LINUX_DMA_MAPPING_H_ */
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