120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
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/*
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* Copyright(c) 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/slab.h>
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#include "pd.h"
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/**
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* rvt_alloc_pd - allocate a protection domain
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* @ibdev: ib device
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* @context: optional user context
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* @udata: optional user data
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*
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* Allocate and keep track of a PD.
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*
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* Return: 0 on success
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*/
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struct ib_pd *rvt_alloc_pd(struct ib_device *ibdev,
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struct ib_ucontext *context,
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struct ib_udata *udata)
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{
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struct rvt_dev_info *dev = ib_to_rvt(ibdev);
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struct rvt_pd *pd;
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struct ib_pd *ret;
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pd = kmalloc(sizeof(*pd), GFP_KERNEL);
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if (!pd) {
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ret = ERR_PTR(-ENOMEM);
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goto bail;
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}
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/*
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* While we could continue allocating protecetion domains, being
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* constrained only by system resources. The IBTA spec defines that
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* there is a max_pd limit that can be set and we need to check for
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* that.
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*/
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spin_lock(&dev->n_pds_lock);
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if (dev->n_pds_allocated == dev->dparms.props.max_pd) {
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spin_unlock(&dev->n_pds_lock);
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kfree(pd);
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ret = ERR_PTR(-ENOMEM);
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goto bail;
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}
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dev->n_pds_allocated++;
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spin_unlock(&dev->n_pds_lock);
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/* ib_alloc_pd() will initialize pd->ibpd. */
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pd->user = udata ? 1 : 0;
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ret = &pd->ibpd;
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bail:
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return ret;
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}
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/**
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* rvt_dealloc_pd - Free PD
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* @ibpd: Free up PD
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*
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* Return: always 0
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*/
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int rvt_dealloc_pd(struct ib_pd *ibpd)
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{
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struct rvt_pd *pd = ibpd_to_rvtpd(ibpd);
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struct rvt_dev_info *dev = ib_to_rvt(ibpd->device);
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spin_lock(&dev->n_pds_lock);
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dev->n_pds_allocated--;
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spin_unlock(&dev->n_pds_lock);
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kfree(pd);
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return 0;
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}
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