1 | // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause |
---|---|
2 | /* |
3 | * Copyright(c) 2016 Intel Corporation. |
4 | */ |
5 | |
6 | #include <linux/slab.h> |
7 | #include "pd.h" |
8 | |
9 | /** |
10 | * rvt_alloc_pd - allocate a protection domain |
11 | * @ibpd: PD |
12 | * @udata: optional user data |
13 | * |
14 | * Allocate and keep track of a PD. |
15 | * |
16 | * Return: 0 on success |
17 | */ |
18 | int rvt_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata) |
19 | { |
20 | struct ib_device *ibdev = ibpd->device; |
21 | struct rvt_dev_info *dev = ib_to_rvt(ibdev); |
22 | struct rvt_pd *pd = ibpd_to_rvtpd(ibpd); |
23 | int ret = 0; |
24 | |
25 | /* |
26 | * While we could continue allocating protecetion domains, being |
27 | * constrained only by system resources. The IBTA spec defines that |
28 | * there is a max_pd limit that can be set and we need to check for |
29 | * that. |
30 | */ |
31 | |
32 | spin_lock(lock: &dev->n_pds_lock); |
33 | if (dev->n_pds_allocated == dev->dparms.props.max_pd) { |
34 | spin_unlock(lock: &dev->n_pds_lock); |
35 | ret = -ENOMEM; |
36 | goto bail; |
37 | } |
38 | |
39 | dev->n_pds_allocated++; |
40 | spin_unlock(lock: &dev->n_pds_lock); |
41 | |
42 | /* ib_alloc_pd() will initialize pd->ibpd. */ |
43 | pd->user = !!udata; |
44 | |
45 | bail: |
46 | return ret; |
47 | } |
48 | |
49 | /** |
50 | * rvt_dealloc_pd - Free PD |
51 | * @ibpd: Free up PD |
52 | * @udata: Valid user data or NULL for kernel object |
53 | * |
54 | * Return: always 0 |
55 | */ |
56 | int rvt_dealloc_pd(struct ib_pd *ibpd, struct ib_udata *udata) |
57 | { |
58 | struct rvt_dev_info *dev = ib_to_rvt(ibdev: ibpd->device); |
59 | |
60 | spin_lock(lock: &dev->n_pds_lock); |
61 | dev->n_pds_allocated--; |
62 | spin_unlock(lock: &dev->n_pds_lock); |
63 | return 0; |
64 | } |
65 |