cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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verbs_txreq.c (2337B)

      1// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
      2/*
      3 * Copyright(c) 2016 - 2018 Intel Corporation.
      4 */
      5
      6#include "hfi.h"
      7#include "verbs_txreq.h"
      8#include "qp.h"
      9#include "trace.h"
     10
     11#define TXREQ_LEN 24
     12
     13void hfi1_put_txreq(struct verbs_txreq *tx)
     14{
     15	struct hfi1_ibdev *dev;
     16	struct rvt_qp *qp;
     17	unsigned long flags;
     18	unsigned int seq;
     19	struct hfi1_qp_priv *priv;
     20
     21	qp = tx->qp;
     22	dev = to_idev(qp->ibqp.device);
     23
     24	if (tx->mr)
     25		rvt_put_mr(tx->mr);
     26
     27	sdma_txclean(dd_from_dev(dev), &tx->txreq);
     28
     29	/* Free verbs_txreq and return to slab cache */
     30	kmem_cache_free(dev->verbs_txreq_cache, tx);
     31
     32	do {
     33		seq = read_seqbegin(&dev->txwait_lock);
     34		if (!list_empty(&dev->txwait)) {
     35			struct iowait *wait;
     36
     37			write_seqlock_irqsave(&dev->txwait_lock, flags);
     38			wait = list_first_entry(&dev->txwait, struct iowait,
     39						list);
     40			qp = iowait_to_qp(wait);
     41			priv = qp->priv;
     42			list_del_init(&priv->s_iowait.list);
     43			/* refcount held until actual wake up */
     44			write_sequnlock_irqrestore(&dev->txwait_lock, flags);
     45			hfi1_qp_wakeup(qp, RVT_S_WAIT_TX);
     46			break;
     47		}
     48	} while (read_seqretry(&dev->txwait_lock, seq));
     49}
     50
     51struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
     52				struct rvt_qp *qp)
     53	__must_hold(&qp->s_lock)
     54{
     55	struct verbs_txreq *tx = NULL;
     56
     57	write_seqlock(&dev->txwait_lock);
     58	if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
     59		struct hfi1_qp_priv *priv;
     60
     61		tx = kmem_cache_alloc(dev->verbs_txreq_cache, VERBS_TXREQ_GFP);
     62		if (tx)
     63			goto out;
     64		priv = qp->priv;
     65		if (list_empty(&priv->s_iowait.list)) {
     66			dev->n_txwait++;
     67			qp->s_flags |= RVT_S_WAIT_TX;
     68			list_add_tail(&priv->s_iowait.list, &dev->txwait);
     69			priv->s_iowait.lock = &dev->txwait_lock;
     70			trace_hfi1_qpsleep(qp, RVT_S_WAIT_TX);
     71			rvt_get_qp(qp);
     72		}
     73		qp->s_flags &= ~RVT_S_BUSY;
     74	}
     75out:
     76	write_sequnlock(&dev->txwait_lock);
     77	return tx;
     78}
     79
     80int verbs_txreq_init(struct hfi1_ibdev *dev)
     81{
     82	char buf[TXREQ_LEN];
     83	struct hfi1_devdata *dd = dd_from_dev(dev);
     84
     85	snprintf(buf, sizeof(buf), "hfi1_%u_vtxreq_cache", dd->unit);
     86	dev->verbs_txreq_cache = kmem_cache_create(buf,
     87						   sizeof(struct verbs_txreq),
     88						   0, SLAB_HWCACHE_ALIGN,
     89						   NULL);
     90	if (!dev->verbs_txreq_cache)
     91		return -ENOMEM;
     92	return 0;
     93}
     94
     95void verbs_txreq_exit(struct hfi1_ibdev *dev)
     96{
     97	kmem_cache_destroy(dev->verbs_txreq_cache);
     98	dev->verbs_txreq_cache = NULL;
     99}