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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qib_wc_ppc64.c (2156B)

      1/*
      2 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
      3 *
      4 * This software is available to you under a choice of one of two
      5 * licenses.  You may choose to be licensed under the terms of the GNU
      6 * General Public License (GPL) Version 2, available from the file
      7 * COPYING in the main directory of this source tree, or the
      8 * OpenIB.org BSD license below:
      9 *
     10 *     Redistribution and use in source and binary forms, with or
     11 *     without modification, are permitted provided that the following
     12 *     conditions are met:
     13 *
     14 *      - Redistributions of source code must retain the above
     15 *        copyright notice, this list of conditions and the following
     16 *        disclaimer.
     17 *
     18 *      - Redistributions in binary form must reproduce the above
     19 *        copyright notice, this list of conditions and the following
     20 *        disclaimer in the documentation and/or other materials
     21 *        provided with the distribution.
     22 *
     23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     30 * SOFTWARE.
     31 */
     32
     33/*
     34 * This file is conditionally built on PowerPC only.  Otherwise weak symbol
     35 * versions of the functions exported from here are used.
     36 */
     37
     38#include "qib.h"
     39
     40/**
     41 * qib_enable_wc - enable write combining for MMIO writes to the device
     42 * @dd: qlogic_ib device
     43 *
     44 * Nothing to do on PowerPC, so just return without error.
     45 */
     46int qib_enable_wc(struct qib_devdata *dd)
     47{
     48	return 0;
     49}
     50
     51/**
     52 * qib_unordered_wc - indicate whether write combining is unordered
     53 *
     54 * Because our performance depends on our ability to do write
     55 * combining mmio writes in the most efficient way, we need to
     56 * know if we are on a processor that may reorder stores when
     57 * write combining.
     58 */
     59int qib_unordered_wc(void)
     60{
     61	return 1;
     62}