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 #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 *dev, u64 mask); 95 void *linux_dma_alloc_coherent(struct device *dev, size_t size, 96 dma_addr_t *dma_handle, gfp_t flag); 97 dma_addr_t linux_dma_map_phys(struct device *dev, vm_paddr_t phys, size_t len); 98 void linux_dma_unmap(struct device *dev, dma_addr_t dma_addr, size_t size); 99 int linux_dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, 100 int nents, enum dma_data_direction dir __unused, 101 unsigned long attrs __unused); 102 void linux_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, 103 int nents __unused, enum dma_data_direction dir __unused, 104 unsigned long attrs __unused); 105 106 static inline int 107 dma_supported(struct device *dev, u64 mask) 108 { 109 110 /* XXX busdma takes care of this elsewhere. */ 111 return (1); 112 } 113 114 static inline int 115 dma_set_mask(struct device *dev, u64 dma_mask) 116 { 117 118 if (!dev->dma_priv || !dma_supported(dev, dma_mask)) 119 return -EIO; 120 121 return (linux_dma_tag_init(dev, dma_mask)); 122 } 123 124 static inline int 125 dma_set_coherent_mask(struct device *dev, u64 mask) 126 { 127 128 if (!dma_supported(dev, mask)) 129 return -EIO; 130 /* XXX Currently we don't support a separate coherent mask. */ 131 return 0; 132 } 133 134 static inline int 135 dma_set_mask_and_coherent(struct device *dev, u64 mask) 136 { 137 int r; 138 139 r = dma_set_mask(dev, mask); 140 if (r == 0) 141 dma_set_coherent_mask(dev, mask); 142 return (r); 143 } 144 145 static inline void * 146 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 147 gfp_t flag) 148 { 149 return (linux_dma_alloc_coherent(dev, size, dma_handle, flag)); 150 } 151 152 static inline void * 153 dma_zalloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 154 gfp_t flag) 155 { 156 157 return (dma_alloc_coherent(dev, size, dma_handle, flag | __GFP_ZERO)); 158 } 159 160 static inline void 161 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, 162 dma_addr_t dma_addr) 163 { 164 165 linux_dma_unmap(dev, dma_addr, size); 166 kmem_free((vm_offset_t)cpu_addr, size); 167 } 168 169 #define dma_map_single_attrs(dev, ptr, size, dir, attrs) \ 170 linux_dma_map_phys(dev, vtophys(ptr), size) 171 172 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \ 173 linux_dma_unmap(dev, dma_addr, size) 174 175 static inline dma_addr_t 176 dma_map_page_attrs(struct device *dev, struct page *page, size_t offset, 177 size_t size, enum dma_data_direction dir, unsigned long attrs) 178 { 179 180 return (linux_dma_map_phys(dev, VM_PAGE_TO_PHYS(page) + offset, size)); 181 } 182 183 /* linux_dma_(un)map_sg_attrs does not support attrs yet */ 184 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \ 185 linux_dma_map_sg_attrs(dev, sgl, nents, dir, 0) 186 187 #define dma_unmap_sg_attrs(dev, sg, nents, dir, attrs) \ 188 linux_dma_unmap_sg_attrs(dev, sg, nents, dir, 0) 189 190 static inline dma_addr_t 191 dma_map_page(struct device *dev, struct page *page, 192 unsigned long offset, size_t size, enum dma_data_direction direction) 193 { 194 195 return (linux_dma_map_phys(dev, VM_PAGE_TO_PHYS(page) + offset, size)); 196 } 197 198 static inline void 199 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, 200 enum dma_data_direction direction) 201 { 202 203 linux_dma_unmap(dev, dma_address, size); 204 } 205 206 static inline void 207 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, 208 enum dma_data_direction direction) 209 { 210 } 211 212 static inline void 213 dma_sync_single(struct device *dev, dma_addr_t addr, size_t size, 214 enum dma_data_direction dir) 215 { 216 dma_sync_single_for_cpu(dev, addr, size, dir); 217 } 218 219 static inline void 220 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, 221 size_t size, enum dma_data_direction direction) 222 { 223 } 224 225 static inline void 226 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, 227 enum dma_data_direction direction) 228 { 229 } 230 231 static inline void 232 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, 233 enum dma_data_direction direction) 234 { 235 } 236 237 static inline void 238 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, 239 unsigned long offset, size_t size, int direction) 240 { 241 } 242 243 static inline void 244 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, 245 unsigned long offset, size_t size, int direction) 246 { 247 } 248 249 static inline int 250 dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 251 { 252 253 return (dma_addr == 0); 254 } 255 256 static inline unsigned int dma_set_max_seg_size(struct device *dev, 257 unsigned int size) 258 { 259 return (0); 260 } 261 262 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0) 263 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0) 264 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0) 265 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0) 266 267 #define DEFINE_DMA_UNMAP_ADDR(name) dma_addr_t name 268 #define DEFINE_DMA_UNMAP_LEN(name) __u32 name 269 #define dma_unmap_addr(p, name) ((p)->name) 270 #define dma_unmap_addr_set(p, name, v) (((p)->name) = (v)) 271 #define dma_unmap_len(p, name) ((p)->name) 272 #define dma_unmap_len_set(p, name, v) (((p)->name) = (v)) 273 274 extern int uma_align_cache; 275 #define dma_get_cache_alignment() uma_align_cache 276 277 #endif /* _LINUX_DMA_MAPPING_H_ */ 278