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f2cbb660 RC |
1 | /* |
2 | * Copyright (c) 2006 QLogic, Corporation. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | */ | |
32 | ||
53d412fc | 33 | #include <linux/scatterlist.h> |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
f2cbb660 RC |
35 | #include <rdma/ib_verbs.h> |
36 | ||
37 | #include "ipath_verbs.h" | |
38 | ||
39 | #define BAD_DMA_ADDRESS ((u64) 0) | |
40 | ||
41 | /* | |
42 | * The following functions implement driver specific replacements | |
43 | * for the ib_dma_*() functions. | |
44 | * | |
45 | * These functions return kernel virtual addresses instead of | |
46 | * device bus addresses since the driver uses the CPU to copy | |
47 | * data instead of using hardware DMA. | |
48 | */ | |
49 | ||
50 | static int ipath_mapping_error(struct ib_device *dev, u64 dma_addr) | |
51 | { | |
52 | return dma_addr == BAD_DMA_ADDRESS; | |
53 | } | |
54 | ||
55 | static u64 ipath_dma_map_single(struct ib_device *dev, | |
56 | void *cpu_addr, size_t size, | |
57 | enum dma_data_direction direction) | |
58 | { | |
59 | BUG_ON(!valid_dma_direction(direction)); | |
60 | return (u64) cpu_addr; | |
61 | } | |
62 | ||
63 | static void ipath_dma_unmap_single(struct ib_device *dev, | |
64 | u64 addr, size_t size, | |
65 | enum dma_data_direction direction) | |
66 | { | |
67 | BUG_ON(!valid_dma_direction(direction)); | |
68 | } | |
69 | ||
70 | static u64 ipath_dma_map_page(struct ib_device *dev, | |
71 | struct page *page, | |
72 | unsigned long offset, | |
73 | size_t size, | |
74 | enum dma_data_direction direction) | |
75 | { | |
76 | u64 addr; | |
77 | ||
78 | BUG_ON(!valid_dma_direction(direction)); | |
79 | ||
80 | if (offset + size > PAGE_SIZE) { | |
81 | addr = BAD_DMA_ADDRESS; | |
82 | goto done; | |
83 | } | |
84 | ||
85 | addr = (u64) page_address(page); | |
86 | if (addr) | |
87 | addr += offset; | |
88 | /* TODO: handle highmem pages */ | |
89 | ||
90 | done: | |
91 | return addr; | |
92 | } | |
93 | ||
94 | static void ipath_dma_unmap_page(struct ib_device *dev, | |
95 | u64 addr, size_t size, | |
96 | enum dma_data_direction direction) | |
97 | { | |
98 | BUG_ON(!valid_dma_direction(direction)); | |
99 | } | |
100 | ||
53d412fc JA |
101 | static int ipath_map_sg(struct ib_device *dev, struct scatterlist *sgl, |
102 | int nents, enum dma_data_direction direction) | |
f2cbb660 | 103 | { |
53d412fc | 104 | struct scatterlist *sg; |
f2cbb660 RC |
105 | u64 addr; |
106 | int i; | |
107 | int ret = nents; | |
108 | ||
109 | BUG_ON(!valid_dma_direction(direction)); | |
110 | ||
53d412fc | 111 | for_each_sg(sgl, sg, nents, i) { |
45711f1a | 112 | addr = (u64) page_address(sg_page(sg)); |
f2cbb660 RC |
113 | /* TODO: handle highmem pages */ |
114 | if (!addr) { | |
115 | ret = 0; | |
116 | break; | |
117 | } | |
118 | } | |
119 | return ret; | |
120 | } | |
121 | ||
122 | static void ipath_unmap_sg(struct ib_device *dev, | |
123 | struct scatterlist *sg, int nents, | |
124 | enum dma_data_direction direction) | |
125 | { | |
126 | BUG_ON(!valid_dma_direction(direction)); | |
127 | } | |
128 | ||
129 | static u64 ipath_sg_dma_address(struct ib_device *dev, struct scatterlist *sg) | |
130 | { | |
45711f1a | 131 | u64 addr = (u64) page_address(sg_page(sg)); |
f2cbb660 RC |
132 | |
133 | if (addr) | |
134 | addr += sg->offset; | |
135 | return addr; | |
136 | } | |
137 | ||
138 | static unsigned int ipath_sg_dma_len(struct ib_device *dev, | |
139 | struct scatterlist *sg) | |
140 | { | |
141 | return sg->length; | |
142 | } | |
143 | ||
144 | static void ipath_sync_single_for_cpu(struct ib_device *dev, | |
145 | u64 addr, | |
146 | size_t size, | |
147 | enum dma_data_direction dir) | |
148 | { | |
149 | } | |
150 | ||
151 | static void ipath_sync_single_for_device(struct ib_device *dev, | |
152 | u64 addr, | |
153 | size_t size, | |
154 | enum dma_data_direction dir) | |
155 | { | |
156 | } | |
157 | ||
158 | static void *ipath_dma_alloc_coherent(struct ib_device *dev, size_t size, | |
159 | u64 *dma_handle, gfp_t flag) | |
160 | { | |
161 | struct page *p; | |
162 | void *addr = NULL; | |
163 | ||
164 | p = alloc_pages(flag, get_order(size)); | |
165 | if (p) | |
166 | addr = page_address(p); | |
167 | if (dma_handle) | |
168 | *dma_handle = (u64) addr; | |
169 | return addr; | |
170 | } | |
171 | ||
172 | static void ipath_dma_free_coherent(struct ib_device *dev, size_t size, | |
62577fa3 | 173 | void *cpu_addr, u64 dma_handle) |
f2cbb660 RC |
174 | { |
175 | free_pages((unsigned long) cpu_addr, get_order(size)); | |
176 | } | |
177 | ||
178 | struct ib_dma_mapping_ops ipath_dma_mapping_ops = { | |
179 | ipath_mapping_error, | |
180 | ipath_dma_map_single, | |
181 | ipath_dma_unmap_single, | |
182 | ipath_dma_map_page, | |
183 | ipath_dma_unmap_page, | |
184 | ipath_map_sg, | |
185 | ipath_unmap_sg, | |
186 | ipath_sg_dma_address, | |
187 | ipath_sg_dma_len, | |
188 | ipath_sync_single_for_cpu, | |
189 | ipath_sync_single_for_device, | |
190 | ipath_dma_alloc_coherent, | |
191 | ipath_dma_free_coherent | |
192 | }; |