dma-mapping.h revision 289644
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: head/sys/ofed/include/linux/dma-mapping.h 289644 2015-10-20 19:08:26Z hselasky $ 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 52enum dma_data_direction { 53 DMA_BIDIRECTIONAL = 0, 54 DMA_TO_DEVICE = 1, 55 DMA_FROM_DEVICE = 2, 56 DMA_NONE = 3, 57}; 58 59struct 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 94static inline int 95dma_supported(struct device *dev, u64 mask) 96{ 97 98 /* XXX busdma takes care of this elsewhere. */ 99 return (1); 100} 101 102static inline int 103dma_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 113static inline int 114dma_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 123static inline void * 124dma_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 145static inline void * 146dma_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 153static inline void 154dma_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. */ 162static inline dma_addr_t 163dma_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 170static inline void 171dma_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 176static inline int 177dma_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 189static inline void 190dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, 191 enum dma_data_direction dir, struct dma_attrs *attrs) 192{ 193} 194 195static inline dma_addr_t 196dma_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 203static inline void 204dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, 205 enum dma_data_direction direction) 206{ 207} 208 209static inline void 210dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, 211 enum dma_data_direction direction) 212{ 213} 214 215static inline void 216dma_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 222static inline void 223dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, 224 size_t size, enum dma_data_direction direction) 225{ 226} 227 228static inline void 229dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, 230 enum dma_data_direction direction) 231{ 232} 233 234static inline void 235dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, 236 enum dma_data_direction direction) 237{ 238} 239 240static inline void 241dma_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 246static inline void 247dma_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 252static inline int 253dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 254{ 255 256 return (0); 257} 258 259static 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 278extern int uma_align_cache; 279#define dma_get_cache_alignment() uma_align_cache 280 281#endif /* _LINUX_DMA_MAPPING_H_ */ 282