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 * @ibdev: ib device 54 * @context: optional user context 55 * @udata: optional user data 56 * 57 * Allocate and keep track of a PD. 58 * 59 * Return: 0 on success 60 */ 61 struct ib_pd *rvt_alloc_pd(struct ib_device *ibdev, 62 struct ib_ucontext *context, 63 struct ib_udata *udata) 64 { 65 struct rvt_dev_info *dev = ib_to_rvt(ibdev); 66 struct rvt_pd *pd; 67 struct ib_pd *ret; 68 69 pd = kmalloc(sizeof(*pd), GFP_KERNEL); 70 if (!pd) { 71 ret = ERR_PTR(-ENOMEM); 72 goto bail; 73 } 74 /* 75 * While we could continue allocating protecetion domains, being 76 * constrained only by system resources. The IBTA spec defines that 77 * there is a max_pd limit that can be set and we need to check for 78 * that. 79 */ 80 81 spin_lock(&dev->n_pds_lock); 82 if (dev->n_pds_allocated == dev->dparms.props.max_pd) { 83 spin_unlock(&dev->n_pds_lock); 84 kfree(pd); 85 ret = ERR_PTR(-ENOMEM); 86 goto bail; 87 } 88 89 dev->n_pds_allocated++; 90 spin_unlock(&dev->n_pds_lock); 91 92 /* ib_alloc_pd() will initialize pd->ibpd. */ 93 pd->user = !!udata; 94 95 ret = &pd->ibpd; 96 97 bail: 98 return ret; 99 } 100 101 /** 102 * rvt_dealloc_pd - Free PD 103 * @ibpd: Free up PD 104 * 105 * Return: always 0 106 */ 107 int rvt_dealloc_pd(struct ib_pd *ibpd) 108 { 109 struct rvt_pd *pd = ibpd_to_rvtpd(ibpd); 110 struct rvt_dev_info *dev = ib_to_rvt(ibpd->device); 111 112 spin_lock(&dev->n_pds_lock); 113 dev->n_pds_allocated--; 114 spin_unlock(&dev->n_pds_lock); 115 116 kfree(pd); 117 118 return 0; 119 } 120