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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2aee309d3e
A failure in the get_txreq() inline will result in a slow path retry using __get_txreq(). __get_txreq() attempts to procure the qp s_lock, which is already held in all callers. Fix by deleting the s_lock maintenance in __get_txreq() and add sparse syntax hooks to future proof the code. Cc: Stable <stable@vger.kernel.org> # 4.6+ Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
148 lines
4.5 KiB
C
148 lines
4.5 KiB
C
/*
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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 "hfi.h"
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#include "verbs_txreq.h"
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#include "qp.h"
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#include "trace.h"
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#define TXREQ_LEN 24
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void hfi1_put_txreq(struct verbs_txreq *tx)
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{
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struct hfi1_ibdev *dev;
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struct rvt_qp *qp;
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unsigned long flags;
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unsigned int seq;
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struct hfi1_qp_priv *priv;
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qp = tx->qp;
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dev = to_idev(qp->ibqp.device);
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if (tx->mr)
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rvt_put_mr(tx->mr);
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sdma_txclean(dd_from_dev(dev), &tx->txreq);
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/* Free verbs_txreq and return to slab cache */
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kmem_cache_free(dev->verbs_txreq_cache, tx);
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do {
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seq = read_seqbegin(&dev->iowait_lock);
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if (!list_empty(&dev->txwait)) {
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struct iowait *wait;
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write_seqlock_irqsave(&dev->iowait_lock, flags);
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wait = list_first_entry(&dev->txwait, struct iowait,
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list);
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qp = iowait_to_qp(wait);
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priv = qp->priv;
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list_del_init(&priv->s_iowait.list);
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/* refcount held until actual wake up */
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write_sequnlock_irqrestore(&dev->iowait_lock, flags);
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hfi1_qp_wakeup(qp, RVT_S_WAIT_TX);
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break;
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}
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} while (read_seqretry(&dev->iowait_lock, seq));
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}
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struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
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struct rvt_qp *qp)
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__must_hold(&qp->s_lock)
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{
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struct verbs_txreq *tx = ERR_PTR(-EBUSY);
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write_seqlock(&dev->iowait_lock);
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if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
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struct hfi1_qp_priv *priv;
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tx = kmem_cache_alloc(dev->verbs_txreq_cache, GFP_ATOMIC);
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if (tx)
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goto out;
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priv = qp->priv;
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if (list_empty(&priv->s_iowait.list)) {
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dev->n_txwait++;
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qp->s_flags |= RVT_S_WAIT_TX;
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list_add_tail(&priv->s_iowait.list, &dev->txwait);
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trace_hfi1_qpsleep(qp, RVT_S_WAIT_TX);
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atomic_inc(&qp->refcount);
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}
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qp->s_flags &= ~RVT_S_BUSY;
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}
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out:
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write_sequnlock(&dev->iowait_lock);
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return tx;
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}
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static void verbs_txreq_kmem_cache_ctor(void *obj)
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{
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struct verbs_txreq *tx = (struct verbs_txreq *)obj;
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memset(tx, 0, sizeof(*tx));
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}
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int verbs_txreq_init(struct hfi1_ibdev *dev)
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{
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char buf[TXREQ_LEN];
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struct hfi1_devdata *dd = dd_from_dev(dev);
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snprintf(buf, sizeof(buf), "hfi1_%u_vtxreq_cache", dd->unit);
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dev->verbs_txreq_cache = kmem_cache_create(buf,
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sizeof(struct verbs_txreq),
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0, SLAB_HWCACHE_ALIGN,
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verbs_txreq_kmem_cache_ctor);
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if (!dev->verbs_txreq_cache)
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return -ENOMEM;
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return 0;
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}
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void verbs_txreq_exit(struct hfi1_ibdev *dev)
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{
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kmem_cache_destroy(dev->verbs_txreq_cache);
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dev->verbs_txreq_cache = NULL;
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}
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