aboutsummaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/mlx4/mr.c
blob: 85ae906f1d12815d1f4d207db071f1c4432dc3f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "mlx4_ib.h"

static u32 convert_access(int acc)
{
	return (acc & IB_ACCESS_REMOTE_ATOMIC ? MLX4_PERM_ATOMIC       : 0) |
	       (acc & IB_ACCESS_REMOTE_WRITE  ? MLX4_PERM_REMOTE_WRITE : 0) |
	       (acc & IB_ACCESS_REMOTE_READ   ? MLX4_PERM_REMOTE_READ  : 0) |
	       (acc & IB_ACCESS_LOCAL_WRITE   ? MLX4_PERM_LOCAL_WRITE  : 0) |
	       MLX4_PERM_LOCAL_READ;
}

struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc)
{
	struct mlx4_ib_mr *mr;
	int err;

	mr = kmalloc(sizeof *mr, GFP_KERNEL);
	if (!mr)
		return ERR_PTR(-ENOMEM);

	err = mlx4_mr_alloc(to_mdev(pd->device)->dev, to_mpd(pd)->pdn, 0,
			    ~0ull, convert_access(acc), 0, 0, &mr->mmr);
	if (err)
		goto err_free;

	err = mlx4_mr_enable(to_mdev(pd->device)->dev, &mr->mmr);
	if (err)
		goto err_mr;

	mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
	mr->umem = NULL;

	return &mr->ibmr;

err_mr:
	mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);

err_free:
	kfree(mr);

	return ERR_PTR(err);
}

int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt,
			   struct ib_umem *umem)
{
	u64 *pages;
	struct ib_umem_chunk *chunk;
	int i, j, k;
	int n;
	int len;
	int err = 0;

	pages = (u64 *) __get_free_page(GFP_KERNEL);
	if (!pages)
		return -ENOMEM;

	i = n = 0;

	list_for_each_entry(chunk, &umem->chunk_list, list)
		for (j = 0; j < chunk->nmap; ++j) {
			len = sg_dma_len(&chunk->page_list[j]) >> mtt->page_shift;
			for (k = 0; k < len; ++k) {
				pages[i++] = sg_dma_address(&chunk->page_list[j]) +
					umem->page_size * k;
				/*
				 * Be friendly to WRITE_MTT firmware
				 * command, and pass it chunks of
				 * appropriate size.
				 */
				if (i == PAGE_SIZE / sizeof (u64) - 2) {
					err = mlx4_write_mtt(dev->dev, mtt, n,
							     i, pages);
					if (err)
						goto out;
					n += i;
					i = 0;
				}
			}
		}

	if (i)
		err = mlx4_write_mtt(dev->dev, mtt, n, i, pages);

out:
	free_page((unsigned long) pages);
	return err;
}

struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
				  u64 virt_addr, int access_flags,
				  struct ib_udata *udata)
{
	struct mlx4_ib_dev *dev = to_mdev(pd->device);
	struct mlx4_ib_mr *mr;
	int shift;
	int err;
	int n;

	mr = kmalloc(sizeof *mr, GFP_KERNEL);
	if (!mr)
		return ERR_PTR(-ENOMEM);

	mr->umem = ib_umem_get(pd->uobject->context, start, length, access_flags);
	if (IS_ERR(mr->umem)) {
		err = PTR_ERR(mr->umem);
		goto err_free;
	}

	n = ib_umem_page_count(mr->umem);
	shift = ilog2(mr->umem->page_size);

	err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length,
			    convert_access(access_flags), n, shift, &mr->mmr);
	if (err)
		goto err_umem;

	err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem);
	if (err)
		goto err_mr;

	err = mlx4_mr_enable(dev->dev, &mr->mmr);
	if (err)
		goto err_mr;

	mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;

	return &mr->ibmr;

err_mr:
	mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);

err_umem:
	ib_umem_release(mr->umem);

err_free:
	kfree(mr);

	return ERR_PTR(err);
}

int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
{
	struct mlx4_ib_mr *mr = to_mmr(ibmr);

	mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
	if (mr->umem)
		ib_umem_release(mr->umem);
	kfree(mr);

	return 0;
}