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77241056 | 1 | /* |
05d6ac1d | 2 | * Copyright(c) 2015, 2016 Intel Corporation. |
77241056 MM |
3 | * |
4 | * This file is provided under a dual BSD/GPLv2 license. When using or | |
5 | * redistributing this file, you may do so under either license. | |
6 | * | |
7 | * GPL LICENSE SUMMARY | |
8 | * | |
77241056 MM |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of version 2 of the GNU General Public License as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * BSD LICENSE | |
19 | * | |
77241056 MM |
20 | * Redistribution and use in source and binary forms, with or without |
21 | * modification, are permitted provided that the following conditions | |
22 | * are met: | |
23 | * | |
24 | * - Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * - Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in | |
28 | * the documentation and/or other materials provided with the | |
29 | * distribution. | |
30 | * - Neither the name of Intel Corporation nor the names of its | |
31 | * contributors may be used to endorse or promote products derived | |
32 | * from this software without specific prior written permission. | |
33 | * | |
34 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
35 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
36 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
37 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
38 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
39 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
40 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
41 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
42 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
43 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
44 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
45 | * | |
46 | */ | |
47 | #include <linux/types.h> | |
48 | #include <linux/scatterlist.h> | |
49 | ||
50 | #include "verbs.h" | |
51 | ||
50e5dcbe | 52 | #define BAD_DMA_ADDRESS ((u64)0) |
77241056 MM |
53 | |
54 | /* | |
55 | * The following functions implement driver specific replacements | |
56 | * for the ib_dma_*() functions. | |
57 | * | |
58 | * These functions return kernel virtual addresses instead of | |
59 | * device bus addresses since the driver uses the CPU to copy | |
60 | * data instead of using hardware DMA. | |
61 | */ | |
62 | ||
63 | static int hfi1_mapping_error(struct ib_device *dev, u64 dma_addr) | |
64 | { | |
65 | return dma_addr == BAD_DMA_ADDRESS; | |
66 | } | |
67 | ||
68 | static u64 hfi1_dma_map_single(struct ib_device *dev, void *cpu_addr, | |
69 | size_t size, enum dma_data_direction direction) | |
70 | { | |
71 | if (WARN_ON(!valid_dma_direction(direction))) | |
72 | return BAD_DMA_ADDRESS; | |
73 | ||
50e5dcbe | 74 | return (u64)cpu_addr; |
77241056 MM |
75 | } |
76 | ||
77 | static void hfi1_dma_unmap_single(struct ib_device *dev, u64 addr, size_t size, | |
78 | enum dma_data_direction direction) | |
79 | { | |
80 | /* This is a stub, nothing to be done here */ | |
81 | } | |
82 | ||
83 | static u64 hfi1_dma_map_page(struct ib_device *dev, struct page *page, | |
84 | unsigned long offset, size_t size, | |
85 | enum dma_data_direction direction) | |
86 | { | |
87 | u64 addr; | |
88 | ||
89 | if (WARN_ON(!valid_dma_direction(direction))) | |
90 | return BAD_DMA_ADDRESS; | |
91 | ||
92 | if (offset + size > PAGE_SIZE) | |
93 | return BAD_DMA_ADDRESS; | |
94 | ||
50e5dcbe | 95 | addr = (u64)page_address(page); |
77241056 MM |
96 | if (addr) |
97 | addr += offset; | |
98 | ||
99 | return addr; | |
100 | } | |
101 | ||
102 | static void hfi1_dma_unmap_page(struct ib_device *dev, u64 addr, size_t size, | |
103 | enum dma_data_direction direction) | |
104 | { | |
105 | /* This is a stub, nothing to be done here */ | |
106 | } | |
107 | ||
108 | static int hfi1_map_sg(struct ib_device *dev, struct scatterlist *sgl, | |
109 | int nents, enum dma_data_direction direction) | |
110 | { | |
111 | struct scatterlist *sg; | |
112 | u64 addr; | |
113 | int i; | |
114 | int ret = nents; | |
115 | ||
116 | if (WARN_ON(!valid_dma_direction(direction))) | |
117 | return BAD_DMA_ADDRESS; | |
118 | ||
119 | for_each_sg(sgl, sg, nents, i) { | |
50e5dcbe | 120 | addr = (u64)page_address(sg_page(sg)); |
77241056 MM |
121 | if (!addr) { |
122 | ret = 0; | |
123 | break; | |
124 | } | |
125 | sg->dma_address = addr + sg->offset; | |
126 | #ifdef CONFIG_NEED_SG_DMA_LENGTH | |
127 | sg->dma_length = sg->length; | |
128 | #endif | |
129 | } | |
130 | return ret; | |
131 | } | |
132 | ||
133 | static void hfi1_unmap_sg(struct ib_device *dev, | |
134 | struct scatterlist *sg, int nents, | |
135 | enum dma_data_direction direction) | |
136 | { | |
137 | /* This is a stub, nothing to be done here */ | |
138 | } | |
139 | ||
140 | static void hfi1_sync_single_for_cpu(struct ib_device *dev, u64 addr, | |
141 | size_t size, enum dma_data_direction dir) | |
142 | { | |
143 | } | |
144 | ||
145 | static void hfi1_sync_single_for_device(struct ib_device *dev, u64 addr, | |
146 | size_t size, | |
147 | enum dma_data_direction dir) | |
148 | { | |
149 | } | |
150 | ||
151 | static void *hfi1_dma_alloc_coherent(struct ib_device *dev, size_t size, | |
152 | u64 *dma_handle, gfp_t flag) | |
153 | { | |
154 | struct page *p; | |
155 | void *addr = NULL; | |
156 | ||
157 | p = alloc_pages(flag, get_order(size)); | |
158 | if (p) | |
159 | addr = page_address(p); | |
160 | if (dma_handle) | |
50e5dcbe | 161 | *dma_handle = (u64)addr; |
77241056 MM |
162 | return addr; |
163 | } | |
164 | ||
165 | static void hfi1_dma_free_coherent(struct ib_device *dev, size_t size, | |
166 | void *cpu_addr, u64 dma_handle) | |
167 | { | |
50e5dcbe | 168 | free_pages((unsigned long)cpu_addr, get_order(size)); |
77241056 MM |
169 | } |
170 | ||
171 | struct ib_dma_mapping_ops hfi1_dma_mapping_ops = { | |
172 | .mapping_error = hfi1_mapping_error, | |
173 | .map_single = hfi1_dma_map_single, | |
174 | .unmap_single = hfi1_dma_unmap_single, | |
175 | .map_page = hfi1_dma_map_page, | |
176 | .unmap_page = hfi1_dma_unmap_page, | |
177 | .map_sg = hfi1_map_sg, | |
178 | .unmap_sg = hfi1_unmap_sg, | |
179 | .sync_single_for_cpu = hfi1_sync_single_for_cpu, | |
180 | .sync_single_for_device = hfi1_sync_single_for_device, | |
181 | .alloc_coherent = hfi1_dma_alloc_coherent, | |
182 | .free_coherent = hfi1_dma_free_coherent | |
183 | }; |