mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Dennis Dalessandro](/assets/img/avatar_default.png)
Add, remove, and otherwise clean up existing comments that are leftover from the initial code postings of rdmavt. Many of the comments were added to provide an idea on the direction we were thinking of going. Now that the design is solidified make a pass over and clean everything up. Also add details where lacking. Ensure all non static functions have nano comments. Reviewed-by: Jubin John <jubin.john@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
/*
|
|
* Copyright(c) 2016 Intel Corporation.
|
|
*
|
|
* This file is provided under a dual BSD/GPLv2 license. When using or
|
|
* redistributing this file, you may do so under either license.
|
|
*
|
|
* GPL LICENSE SUMMARY
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of version 2 of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* BSD LICENSE
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* - Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* - Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* - Neither the name of Intel Corporation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include "pd.h"
|
|
|
|
/**
|
|
* rvt_alloc_pd - allocate a protection domain
|
|
* @ibdev: ib device
|
|
* @context: optional user context
|
|
* @udata: optional user data
|
|
*
|
|
* Allocate and keep track of a PD.
|
|
*
|
|
* Return: 0 on success
|
|
*/
|
|
struct ib_pd *rvt_alloc_pd(struct ib_device *ibdev,
|
|
struct ib_ucontext *context,
|
|
struct ib_udata *udata)
|
|
{
|
|
struct rvt_dev_info *dev = ib_to_rvt(ibdev);
|
|
struct rvt_pd *pd;
|
|
struct ib_pd *ret;
|
|
|
|
pd = kmalloc(sizeof(*pd), GFP_KERNEL);
|
|
if (!pd) {
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto bail;
|
|
}
|
|
/*
|
|
* While we could continue allocating protecetion domains, being
|
|
* constrained only by system resources. The IBTA spec defines that
|
|
* there is a max_pd limit that can be set and we need to check for
|
|
* that.
|
|
*/
|
|
|
|
spin_lock(&dev->n_pds_lock);
|
|
if (dev->n_pds_allocated == dev->dparms.props.max_pd) {
|
|
spin_unlock(&dev->n_pds_lock);
|
|
kfree(pd);
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto bail;
|
|
}
|
|
|
|
dev->n_pds_allocated++;
|
|
spin_unlock(&dev->n_pds_lock);
|
|
|
|
/* ib_alloc_pd() will initialize pd->ibpd. */
|
|
pd->user = udata ? 1 : 0;
|
|
|
|
ret = &pd->ibpd;
|
|
|
|
bail:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* rvt_dealloc_pd - Free PD
|
|
* @ibpd: Free up PD
|
|
*
|
|
* Return: always 0
|
|
*/
|
|
int rvt_dealloc_pd(struct ib_pd *ibpd)
|
|
{
|
|
struct rvt_pd *pd = ibpd_to_rvtpd(ibpd);
|
|
struct rvt_dev_info *dev = ib_to_rvt(ibpd->device);
|
|
|
|
spin_lock(&dev->n_pds_lock);
|
|
dev->n_pds_allocated--;
|
|
spin_unlock(&dev->n_pds_lock);
|
|
|
|
kfree(pd);
|
|
|
|
return 0;
|
|
}
|