1 /*
2 * Copyright(c) 2016 Intel Corporation.
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 *
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 *
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
48 #include <linux/slab.h>
49 #include "pd.h"
50
51 /**
52 * rvt_alloc_pd - allocate a protection domain
53 * @ibpd: PD
54 * @udata: optional user data
55 *
56 * Allocate and keep track of a PD.
57 *
58 * Return: 0 on success
59 */
60 int rvt_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
61 {
62 struct ib_device *ibdev = ibpd->device;
63 struct rvt_dev_info *dev = ib_to_rvt(ibdev);
64 struct rvt_pd *pd = ibpd_to_rvtpd(ibpd);
65 int ret = 0;
66
67 /*
68 * While we could continue allocating protecetion domains, being
69 * constrained only by system resources. The IBTA spec defines that
70 * there is a max_pd limit that can be set and we need to check for
71 * that.
72 */
73
74 spin_lock(&dev->n_pds_lock);
75 if (dev->n_pds_allocated == dev->dparms.props.max_pd) {
76 spin_unlock(&dev->n_pds_lock);
77 ret = -ENOMEM;
78 goto bail;
79 }
80
81 dev->n_pds_allocated++;
82 spin_unlock(&dev->n_pds_lock);
83
84 /* ib_alloc_pd() will initialize pd->ibpd. */
85 pd->user = !!udata;
86
87 bail:
88 return ret;
89 }
90
91 /**
92 * rvt_dealloc_pd - Free PD
93 * @ibpd: Free up PD
94 * @udata: Valid user data or NULL for kernel object
95 *
96 * Return: always 0
97 */
98 void rvt_dealloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
99 {
100 struct rvt_dev_info *dev = ib_to_rvt(ibpd->device);
101
102 spin_lock(&dev->n_pds_lock);
103 dev->n_pds_allocated--;
104 spin_unlock(&dev->n_pds_lock);
105 }