dma-mapping.h revision 345907
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: stable/11/sys/compat/linuxkpi/common/include/linux/dma-mapping.h 345907 2019-04-05 11:05:55Z 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 51enum dma_data_direction { 52 DMA_BIDIRECTIONAL = 0, 53 DMA_TO_DEVICE = 1, 54 DMA_FROM_DEVICE = 2, 55 DMA_NONE = 3, 56}; 57 58struct 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 93static inline int 94dma_supported(struct device *dev, u64 mask) 95{ 96 97 /* XXX busdma takes care of this elsewhere. */ 98 return (1); 99} 100 101static inline int 102dma_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 112static inline int 113dma_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 122static inline int 123dma_set_mask_and_coherent(struct device *dev, u64 mask) 124{ 125 int r; 126 127 r = dma_set_mask(dev, mask); 128 if (r == 0) 129 dma_set_coherent_mask(dev, mask); 130 return (r); 131} 132 133static inline void * 134dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 135 gfp_t flag) 136{ 137 vm_paddr_t high; 138 size_t align; 139 void *mem; 140 141 if (dev != NULL && dev->dma_mask) 142 high = *dev->dma_mask; 143 else if (flag & GFP_DMA32) 144 high = BUS_SPACE_MAXADDR_32BIT; 145 else 146 high = BUS_SPACE_MAXADDR; 147 align = PAGE_SIZE << get_order(size); 148 mem = (void *)kmem_alloc_contig(kmem_arena, size, flag, 0, high, align, 149 0, VM_MEMATTR_DEFAULT); 150 if (mem) 151 *dma_handle = vtophys(mem); 152 else 153 *dma_handle = 0; 154 return (mem); 155} 156 157static inline void * 158dma_zalloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 159 gfp_t flag) 160{ 161 162 return (dma_alloc_coherent(dev, size, dma_handle, flag | __GFP_ZERO)); 163} 164 165static inline void 166dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, 167 dma_addr_t dma_handle) 168{ 169 170 kmem_free(kmem_arena, (vm_offset_t)cpu_addr, size); 171} 172 173/* XXX This only works with no iommu. */ 174static inline dma_addr_t 175dma_map_single_attrs(struct device *dev, void *ptr, size_t size, 176 enum dma_data_direction dir, struct dma_attrs *attrs) 177{ 178 179 return vtophys(ptr); 180} 181 182static inline void 183dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, size_t size, 184 enum dma_data_direction dir, struct dma_attrs *attrs) 185{ 186} 187 188static inline int 189dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nents, 190 enum dma_data_direction dir, struct dma_attrs *attrs) 191{ 192 struct scatterlist *sg; 193 int i; 194 195 for_each_sg(sgl, sg, nents, i) 196 sg_dma_address(sg) = sg_phys(sg); 197 198 return (nents); 199} 200 201static inline void 202dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, 203 enum dma_data_direction dir, struct dma_attrs *attrs) 204{ 205} 206 207static inline dma_addr_t 208dma_map_page(struct device *dev, struct page *page, 209 unsigned long offset, size_t size, enum dma_data_direction direction) 210{ 211 212 return VM_PAGE_TO_PHYS(page) + offset; 213} 214 215static inline void 216dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, 217 enum dma_data_direction direction) 218{ 219} 220 221static inline void 222dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, 223 enum dma_data_direction direction) 224{ 225} 226 227static inline void 228dma_sync_single(struct device *dev, dma_addr_t addr, size_t size, 229 enum dma_data_direction dir) 230{ 231 dma_sync_single_for_cpu(dev, addr, size, dir); 232} 233 234static inline void 235dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, 236 size_t size, enum dma_data_direction direction) 237{ 238} 239 240static inline void 241dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, 242 enum dma_data_direction direction) 243{ 244} 245 246static inline void 247dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, 248 enum dma_data_direction direction) 249{ 250} 251 252static inline void 253dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, 254 unsigned long offset, size_t size, int direction) 255{ 256} 257 258static inline void 259dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, 260 unsigned long offset, size_t size, int direction) 261{ 262} 263 264static inline int 265dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 266{ 267 268 return (0); 269} 270 271static inline unsigned int dma_set_max_seg_size(struct device *dev, 272 unsigned int size) 273{ 274 return (0); 275} 276 277 278#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL) 279#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL) 280#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL) 281#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL) 282 283#define DEFINE_DMA_UNMAP_ADDR(name) dma_addr_t name 284#define DEFINE_DMA_UNMAP_LEN(name) __u32 name 285#define dma_unmap_addr(p, name) ((p)->name) 286#define dma_unmap_addr_set(p, name, v) (((p)->name) = (v)) 287#define dma_unmap_len(p, name) ((p)->name) 288#define dma_unmap_len_set(p, name, v) (((p)->name) = (v)) 289 290extern int uma_align_cache; 291#define dma_get_cache_alignment() uma_align_cache 292 293#endif /* _LINUX_DMA_MAPPING_H_ */ 294