| 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 |