| 1 | /* $Id: RTMpOnPair-generic.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - RTMpOnPair, generic implementation using RTMpOnAll.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2015-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "internal/iprt.h"
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| 32 | #include <iprt/mp.h>
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| 33 |
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| 34 | #include <iprt/asm.h>
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| 35 | #include <iprt/assert.h>
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| 36 | #include <iprt/err.h>
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| 37 |
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| 38 |
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| 39 | /*********************************************************************************************************************************
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| 40 | * Structures and Typedefs *
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| 41 | *********************************************************************************************************************************/
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| 42 | /**
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| 43 | * Argument package for the generic RTMpOnPair implemenetation.
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| 44 | */
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| 45 | typedef struct RTMPONPAIRGENERIC
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| 46 | {
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| 47 | RTCPUID idCpu1;
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| 48 | RTCPUID idCpu2;
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| 49 | PFNRTMPWORKER pfnWorker;
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| 50 | void *pvUser1;
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| 51 | void *pvUser2;
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| 52 | /** Count of how many CPUs actually showed up. */
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| 53 | uint32_t volatile cPresent;
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| 54 | } RTMPONPAIRGENERIC;
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| 55 | /** Pointer to the an argument package for the generic RTMpOnPair
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| 56 | * implemenation. */
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| 57 | typedef RTMPONPAIRGENERIC *PRTMPONPAIRGENERIC;
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| 58 |
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| 59 |
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| 60 | /**
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| 61 | * @callback_method_impl{FNRTMPWORKER,
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| 62 | * Used by RTMpOnPair to call the worker on the two specified CPUs.}
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| 63 | */
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| 64 | static DECLCALLBACK(void) rtMpOnPairGenericWorker(RTCPUID idCpu, void *pvUser1, void *pvUser2)
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| 65 | {
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| 66 | RT_NOREF(pvUser2);
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| 67 | PRTMPONPAIRGENERIC pArgs = (PRTMPONPAIRGENERIC)pvUser1;
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| 68 |
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| 69 | /*
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| 70 | * Only the two choosen CPUs should call the worker function, count how
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| 71 | * many of them that showed up.
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| 72 | */
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| 73 | if ( idCpu == pArgs->idCpu1
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| 74 | || idCpu == pArgs->idCpu2)
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| 75 | {
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| 76 | ASMAtomicIncU32(&pArgs->cPresent);
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| 77 | pArgs->pfnWorker(idCpu, pArgs->pvUser1, pArgs->pvUser2);
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| 78 | }
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| 79 | }
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| 80 |
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| 81 |
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| 82 | RTDECL(int) RTMpOnPair(RTCPUID idCpu1, RTCPUID idCpu2, uint32_t fFlags, PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
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| 83 | {
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| 84 | int rc;
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| 85 | AssertReturn(idCpu1 != idCpu2, VERR_INVALID_PARAMETER);
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| 86 | AssertReturn(!(fFlags & RTMPON_F_VALID_MASK), VERR_INVALID_FLAGS);
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| 87 | if ((fFlags & RTMPON_F_CONCURRENT_EXEC) && !RTMpOnAllIsConcurrentSafe())
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| 88 | return VERR_NOT_SUPPORTED;
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| 89 |
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| 90 | /*
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| 91 | * Check that both CPUs are online before doing the broadcast call.
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| 92 | */
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| 93 | if ( RTMpIsCpuOnline(idCpu1)
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| 94 | && RTMpIsCpuOnline(idCpu2))
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| 95 | {
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| 96 | RTMPONPAIRGENERIC Args;
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| 97 | Args.idCpu1 = idCpu1;
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| 98 | Args.idCpu2 = idCpu2;
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| 99 | Args.pfnWorker = pfnWorker;
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| 100 | Args.pvUser1 = pvUser1;
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| 101 | Args.pvUser2 = pvUser2;
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| 102 | Args.cPresent = 0;
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| 103 | rc = RTMpOnAll(rtMpOnPairGenericWorker, &Args, pvUser2);
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| 104 | if (RT_SUCCESS(rc))
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| 105 | {
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| 106 | /*
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| 107 | * Let's see if both of the CPUs showed up.
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| 108 | */
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| 109 | if (RT_LIKELY(Args.cPresent == 2))
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| 110 | { /* likely */ }
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| 111 | else if (Args.cPresent == 0)
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| 112 | rc = VERR_CPU_OFFLINE;
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| 113 | else if (Args.cPresent == 1)
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| 114 | rc = VERR_NOT_ALL_CPUS_SHOWED;
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| 115 | else
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| 116 | {
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| 117 | rc = VERR_CPU_IPE_1;
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| 118 | AssertMsgFailed(("cPresent=%#x\n", Args.cPresent));
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| 119 | }
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| 120 | }
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| 121 | }
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| 122 | /*
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| 123 | * A CPU must be present to be considered just offline.
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| 124 | */
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| 125 | else if ( RTMpIsCpuPresent(idCpu1)
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| 126 | && RTMpIsCpuPresent(idCpu2))
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| 127 | rc = VERR_CPU_OFFLINE;
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| 128 | else
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| 129 | rc = VERR_CPU_NOT_FOUND;
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| 130 | return rc;
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| 131 | }
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| 132 |
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| 133 |
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| 134 | RTDECL(bool) RTMpOnPairIsConcurrentExecSupported(void)
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| 135 | {
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| 136 | return RTMpOnAllIsConcurrentSafe();
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| 137 | }
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| 138 |
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