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 int 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 return 0; 106 } 107