drivers/infiniband/sw/rdmavt/pd.c

   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 }