2 * Copyright (c) 2006 QLogic, Corporation. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
33 #include <rdma/ib_verbs.h>
35 #include "ipath_verbs.h"
37 #define BAD_DMA_ADDRESS ((u64) 0)
40 * The following functions implement driver specific replacements
41 * for the ib_dma_*() functions.
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.
48 static int ipath_mapping_error(struct ib_device
*dev
, u64 dma_addr
)
50 return dma_addr
== BAD_DMA_ADDRESS
;
53 static u64
ipath_dma_map_single(struct ib_device
*dev
,
54 void *cpu_addr
, size_t size
,
55 enum dma_data_direction direction
)
57 BUG_ON(!valid_dma_direction(direction
));
58 return (u64
) cpu_addr
;
61 static void ipath_dma_unmap_single(struct ib_device
*dev
,
62 u64 addr
, size_t size
,
63 enum dma_data_direction direction
)
65 BUG_ON(!valid_dma_direction(direction
));
68 static u64
ipath_dma_map_page(struct ib_device
*dev
,
72 enum dma_data_direction direction
)
76 BUG_ON(!valid_dma_direction(direction
));
78 if (offset
+ size
> PAGE_SIZE
) {
79 addr
= BAD_DMA_ADDRESS
;
83 addr
= (u64
) page_address(page
);
86 /* TODO: handle highmem pages */
92 static void ipath_dma_unmap_page(struct ib_device
*dev
,
93 u64 addr
, size_t size
,
94 enum dma_data_direction direction
)
96 BUG_ON(!valid_dma_direction(direction
));
99 static int ipath_map_sg(struct ib_device
*dev
, struct scatterlist
*sg
, int nents
,
100 enum dma_data_direction direction
)
106 BUG_ON(!valid_dma_direction(direction
));
108 for (i
= 0; i
< nents
; i
++) {
109 addr
= (u64
) page_address(sg
[i
].page
);
110 /* TODO: handle highmem pages */
119 static void ipath_unmap_sg(struct ib_device
*dev
,
120 struct scatterlist
*sg
, int nents
,
121 enum dma_data_direction direction
)
123 BUG_ON(!valid_dma_direction(direction
));
126 static u64
ipath_sg_dma_address(struct ib_device
*dev
, struct scatterlist
*sg
)
128 u64 addr
= (u64
) page_address(sg
->page
);
135 static unsigned int ipath_sg_dma_len(struct ib_device
*dev
,
136 struct scatterlist
*sg
)
141 static void ipath_sync_single_for_cpu(struct ib_device
*dev
,
144 enum dma_data_direction dir
)
148 static void ipath_sync_single_for_device(struct ib_device
*dev
,
151 enum dma_data_direction dir
)
155 static void *ipath_dma_alloc_coherent(struct ib_device
*dev
, size_t size
,
156 u64
*dma_handle
, gfp_t flag
)
161 p
= alloc_pages(flag
, get_order(size
));
163 addr
= page_address(p
);
165 *dma_handle
= (u64
) addr
;
169 static void ipath_dma_free_coherent(struct ib_device
*dev
, size_t size
,
170 void *cpu_addr
, u64 dma_handle
)
172 free_pages((unsigned long) cpu_addr
, get_order(size
));
175 struct ib_dma_mapping_ops ipath_dma_mapping_ops
= {
177 ipath_dma_map_single
,
178 ipath_dma_unmap_single
,
180 ipath_dma_unmap_page
,
183 ipath_sg_dma_address
,
185 ipath_sync_single_for_cpu
,
186 ipath_sync_single_for_device
,
187 ipath_dma_alloc_coherent
,
188 ipath_dma_free_coherent