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f931551b RC |
1 | /* |
2 | * Copyright (c) 2006, 2009, 2010 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 | #include <linux/types.h> | |
33 | #include <linux/scatterlist.h> | |
34 | ||
35 | #include "qib_verbs.h" | |
36 | ||
37 | #define BAD_DMA_ADDRESS ((u64) 0) | |
38 | ||
39 | /* | |
40 | * The following functions implement driver specific replacements | |
41 | * for the ib_dma_*() functions. | |
42 | * | |
43 | * These functions return kernel virtual addresses instead of | |
44 | * device bus addresses since the driver uses the CPU to copy | |
45 | * data instead of using hardware DMA. | |
46 | */ | |
47 | ||
48 | static int qib_mapping_error(struct ib_device *dev, u64 dma_addr) | |
49 | { | |
50 | return dma_addr == BAD_DMA_ADDRESS; | |
51 | } | |
52 | ||
53 | static u64 qib_dma_map_single(struct ib_device *dev, void *cpu_addr, | |
54 | size_t size, enum dma_data_direction direction) | |
55 | { | |
56 | BUG_ON(!valid_dma_direction(direction)); | |
57 | return (u64) cpu_addr; | |
58 | } | |
59 | ||
60 | static void qib_dma_unmap_single(struct ib_device *dev, u64 addr, size_t size, | |
61 | enum dma_data_direction direction) | |
62 | { | |
63 | BUG_ON(!valid_dma_direction(direction)); | |
64 | } | |
65 | ||
66 | static u64 qib_dma_map_page(struct ib_device *dev, struct page *page, | |
67 | unsigned long offset, size_t size, | |
68 | enum dma_data_direction direction) | |
69 | { | |
70 | u64 addr; | |
71 | ||
72 | BUG_ON(!valid_dma_direction(direction)); | |
73 | ||
74 | if (offset + size > PAGE_SIZE) { | |
75 | addr = BAD_DMA_ADDRESS; | |
76 | goto done; | |
77 | } | |
78 | ||
79 | addr = (u64) page_address(page); | |
80 | if (addr) | |
81 | addr += offset; | |
82 | /* TODO: handle highmem pages */ | |
83 | ||
84 | done: | |
85 | return addr; | |
86 | } | |
87 | ||
88 | static void qib_dma_unmap_page(struct ib_device *dev, u64 addr, size_t size, | |
89 | enum dma_data_direction direction) | |
90 | { | |
91 | BUG_ON(!valid_dma_direction(direction)); | |
92 | } | |
93 | ||
94 | static int qib_map_sg(struct ib_device *dev, struct scatterlist *sgl, | |
95 | int nents, enum dma_data_direction direction) | |
96 | { | |
97 | struct scatterlist *sg; | |
98 | u64 addr; | |
99 | int i; | |
100 | int ret = nents; | |
101 | ||
102 | BUG_ON(!valid_dma_direction(direction)); | |
103 | ||
104 | for_each_sg(sgl, sg, nents, i) { | |
105 | addr = (u64) page_address(sg_page(sg)); | |
106 | /* TODO: handle highmem pages */ | |
107 | if (!addr) { | |
108 | ret = 0; | |
109 | break; | |
110 | } | |
111 | } | |
112 | return ret; | |
113 | } | |
114 | ||
115 | static void qib_unmap_sg(struct ib_device *dev, | |
116 | struct scatterlist *sg, int nents, | |
117 | enum dma_data_direction direction) | |
118 | { | |
119 | BUG_ON(!valid_dma_direction(direction)); | |
120 | } | |
121 | ||
122 | static u64 qib_sg_dma_address(struct ib_device *dev, struct scatterlist *sg) | |
123 | { | |
124 | u64 addr = (u64) page_address(sg_page(sg)); | |
125 | ||
126 | if (addr) | |
127 | addr += sg->offset; | |
128 | return addr; | |
129 | } | |
130 | ||
131 | static unsigned int qib_sg_dma_len(struct ib_device *dev, | |
132 | struct scatterlist *sg) | |
133 | { | |
134 | return sg->length; | |
135 | } | |
136 | ||
137 | static void qib_sync_single_for_cpu(struct ib_device *dev, u64 addr, | |
138 | size_t size, enum dma_data_direction dir) | |
139 | { | |
140 | } | |
141 | ||
142 | static void qib_sync_single_for_device(struct ib_device *dev, u64 addr, | |
143 | size_t size, | |
144 | enum dma_data_direction dir) | |
145 | { | |
146 | } | |
147 | ||
148 | static void *qib_dma_alloc_coherent(struct ib_device *dev, size_t size, | |
149 | u64 *dma_handle, gfp_t flag) | |
150 | { | |
151 | struct page *p; | |
152 | void *addr = NULL; | |
153 | ||
154 | p = alloc_pages(flag, get_order(size)); | |
155 | if (p) | |
156 | addr = page_address(p); | |
157 | if (dma_handle) | |
158 | *dma_handle = (u64) addr; | |
159 | return addr; | |
160 | } | |
161 | ||
162 | static void qib_dma_free_coherent(struct ib_device *dev, size_t size, | |
163 | void *cpu_addr, u64 dma_handle) | |
164 | { | |
165 | free_pages((unsigned long) cpu_addr, get_order(size)); | |
166 | } | |
167 | ||
168 | struct ib_dma_mapping_ops qib_dma_mapping_ops = { | |
169 | .mapping_error = qib_mapping_error, | |
170 | .map_single = qib_dma_map_single, | |
171 | .unmap_single = qib_dma_unmap_single, | |
172 | .map_page = qib_dma_map_page, | |
173 | .unmap_page = qib_dma_unmap_page, | |
174 | .map_sg = qib_map_sg, | |
175 | .unmap_sg = qib_unmap_sg, | |
176 | .dma_address = qib_sg_dma_address, | |
177 | .dma_len = qib_sg_dma_len, | |
178 | .sync_single_for_cpu = qib_sync_single_for_cpu, | |
179 | .sync_single_for_device = qib_sync_single_for_device, | |
180 | .alloc_coherent = qib_dma_alloc_coherent, | |
181 | .free_coherent = qib_dma_free_coherent | |
182 | }; |