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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exp_rcv.c (1807B)

      1// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
      2/*
      3 * Copyright(c) 2017 Intel Corporation.
      4 */
      5
      6#include "exp_rcv.h"
      7#include "trace.h"
      8
      9/**
     10 * hfi1_exp_tid_set_init - initialize exp_tid_set
     11 * @set: the set
     12 */
     13static void hfi1_exp_tid_set_init(struct exp_tid_set *set)
     14{
     15	INIT_LIST_HEAD(&set->list);
     16	set->count = 0;
     17}
     18
     19/**
     20 * hfi1_exp_tid_group_init - initialize rcd expected receive
     21 * @rcd: the rcd
     22 */
     23void hfi1_exp_tid_group_init(struct hfi1_ctxtdata *rcd)
     24{
     25	hfi1_exp_tid_set_init(&rcd->tid_group_list);
     26	hfi1_exp_tid_set_init(&rcd->tid_used_list);
     27	hfi1_exp_tid_set_init(&rcd->tid_full_list);
     28}
     29
     30/**
     31 * hfi1_alloc_ctxt_rcv_groups - initialize expected receive groups
     32 * @rcd: the context to add the groupings to
     33 */
     34int hfi1_alloc_ctxt_rcv_groups(struct hfi1_ctxtdata *rcd)
     35{
     36	struct hfi1_devdata *dd = rcd->dd;
     37	u32 tidbase;
     38	struct tid_group *grp;
     39	int i;
     40	u32 ngroups;
     41
     42	ngroups = rcd->expected_count / dd->rcv_entries.group_size;
     43	rcd->groups =
     44		kcalloc_node(ngroups, sizeof(*rcd->groups),
     45			     GFP_KERNEL, rcd->numa_id);
     46	if (!rcd->groups)
     47		return -ENOMEM;
     48	tidbase = rcd->expected_base;
     49	for (i = 0; i < ngroups; i++) {
     50		grp = &rcd->groups[i];
     51		grp->size = dd->rcv_entries.group_size;
     52		grp->base = tidbase;
     53		tid_group_add_tail(grp, &rcd->tid_group_list);
     54		tidbase += dd->rcv_entries.group_size;
     55	}
     56
     57	return 0;
     58}
     59
     60/**
     61 * hfi1_free_ctxt_rcv_groups - free  expected receive groups
     62 * @rcd: the context to free
     63 *
     64 * The routine dismantles the expect receive linked
     65 * list and clears any tids associated with the receive
     66 * context.
     67 *
     68 * This should only be called for kernel contexts and the
     69 * a base user context.
     70 */
     71void hfi1_free_ctxt_rcv_groups(struct hfi1_ctxtdata *rcd)
     72{
     73	kfree(rcd->groups);
     74	rcd->groups = NULL;
     75	hfi1_exp_tid_group_init(rcd);
     76
     77	hfi1_clear_tids(rcd);
     78}