| 1 | /* $Id: RTMpOnPair-generic.cpp 63509 2016-08-15 22:54:50Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - RTMpOnPair, generic implementation using RTMpOnAll.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2015-2016 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * The contents of this file may alternatively be used under the terms
|
|---|
| 18 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | *
|
|---|
| 23 | * You may elect to license modified versions of this file under the
|
|---|
| 24 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | */
|
|---|
| 26 |
|
|---|
| 27 |
|
|---|
| 28 | /*********************************************************************************************************************************
|
|---|
| 29 | * Header Files *
|
|---|
| 30 | *********************************************************************************************************************************/
|
|---|
| 31 | #include "internal/iprt.h"
|
|---|
| 32 | #include <iprt/mp.h>
|
|---|
| 33 |
|
|---|
| 34 | #include <iprt/asm.h>
|
|---|
| 35 | #include <iprt/assert.h>
|
|---|
| 36 | #include <iprt/err.h>
|
|---|
| 37 |
|
|---|
| 38 |
|
|---|
| 39 | /*********************************************************************************************************************************
|
|---|
| 40 | * Structures and Typedefs *
|
|---|
| 41 | *********************************************************************************************************************************/
|
|---|
| 42 | /**
|
|---|
| 43 | * Argument package for the generic RTMpOnPair implemenetation.
|
|---|
| 44 | */
|
|---|
| 45 | typedef struct RTMPONPAIRGENERIC
|
|---|
| 46 | {
|
|---|
| 47 | RTCPUID idCpu1;
|
|---|
| 48 | RTCPUID idCpu2;
|
|---|
| 49 | PFNRTMPWORKER pfnWorker;
|
|---|
| 50 | void *pvUser1;
|
|---|
| 51 | void *pvUser2;
|
|---|
| 52 | /** Count of how many CPUs actually showed up. */
|
|---|
| 53 | uint32_t volatile cPresent;
|
|---|
| 54 | } RTMPONPAIRGENERIC;
|
|---|
| 55 | /** Pointer to the an argument package for the generic RTMpOnPair
|
|---|
| 56 | * implemenation. */
|
|---|
| 57 | typedef RTMPONPAIRGENERIC *PRTMPONPAIRGENERIC;
|
|---|
| 58 |
|
|---|
| 59 |
|
|---|
| 60 | /**
|
|---|
| 61 | * @callback_method_impl{FNRTMPWORKER,
|
|---|
| 62 | * Used by RTMpOnPair to call the worker on the two specified CPUs.}
|
|---|
| 63 | */
|
|---|
| 64 | static DECLCALLBACK(void) rtMpOnPairGenericWorker(RTCPUID idCpu, void *pvUser1, void *pvUser2)
|
|---|
| 65 | {
|
|---|
| 66 | RT_NOREF(pvUser2);
|
|---|
| 67 | PRTMPONPAIRGENERIC pArgs = (PRTMPONPAIRGENERIC)pvUser1;
|
|---|
| 68 |
|
|---|
| 69 | /*
|
|---|
| 70 | * Only the two choosen CPUs should call the worker function, count how
|
|---|
| 71 | * many of them that showed up.
|
|---|
| 72 | */
|
|---|
| 73 | if ( idCpu == pArgs->idCpu1
|
|---|
| 74 | || idCpu == pArgs->idCpu2)
|
|---|
| 75 | {
|
|---|
| 76 | ASMAtomicIncU32(&pArgs->cPresent);
|
|---|
| 77 | pArgs->pfnWorker(idCpu, pArgs->pvUser1, pArgs->pvUser2);
|
|---|
| 78 | }
|
|---|
| 79 | }
|
|---|
| 80 |
|
|---|
| 81 |
|
|---|
| 82 | RTDECL(int) RTMpOnPair(RTCPUID idCpu1, RTCPUID idCpu2, uint32_t fFlags, PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
|
|---|
| 83 | {
|
|---|
| 84 | int rc;
|
|---|
| 85 | AssertReturn(idCpu1 != idCpu2, VERR_INVALID_PARAMETER);
|
|---|
| 86 | AssertReturn(!(fFlags & RTMPON_F_VALID_MASK), VERR_INVALID_FLAGS);
|
|---|
| 87 | if ((fFlags & RTMPON_F_CONCURRENT_EXEC) && !RTMpOnAllIsConcurrentSafe())
|
|---|
| 88 | return VERR_NOT_SUPPORTED;
|
|---|
| 89 |
|
|---|
| 90 | /*
|
|---|
| 91 | * Check that both CPUs are online before doing the broadcast call.
|
|---|
| 92 | */
|
|---|
| 93 | if ( RTMpIsCpuOnline(idCpu1)
|
|---|
| 94 | && RTMpIsCpuOnline(idCpu2))
|
|---|
| 95 | {
|
|---|
| 96 | RTMPONPAIRGENERIC Args;
|
|---|
| 97 | Args.idCpu1 = idCpu1;
|
|---|
| 98 | Args.idCpu2 = idCpu2;
|
|---|
| 99 | Args.pfnWorker = pfnWorker;
|
|---|
| 100 | Args.pvUser1 = pvUser1;
|
|---|
| 101 | Args.pvUser2 = pvUser2;
|
|---|
| 102 | Args.cPresent = 0;
|
|---|
| 103 | rc = RTMpOnAll(rtMpOnPairGenericWorker, &Args, pvUser2);
|
|---|
| 104 | if (RT_SUCCESS(rc))
|
|---|
| 105 | {
|
|---|
| 106 | /*
|
|---|
| 107 | * Let's see if both of the CPUs showed up.
|
|---|
| 108 | */
|
|---|
| 109 | if (RT_LIKELY(Args.cPresent == 2))
|
|---|
| 110 | { /* likely */ }
|
|---|
| 111 | else if (Args.cPresent == 0)
|
|---|
| 112 | rc = VERR_CPU_OFFLINE;
|
|---|
| 113 | else if (Args.cPresent == 1)
|
|---|
| 114 | rc = VERR_NOT_ALL_CPUS_SHOWED;
|
|---|
| 115 | else
|
|---|
| 116 | {
|
|---|
| 117 | rc = VERR_CPU_IPE_1;
|
|---|
| 118 | AssertMsgFailed(("cPresent=%#x\n", Args.cPresent));
|
|---|
| 119 | }
|
|---|
| 120 | }
|
|---|
| 121 | }
|
|---|
| 122 | /*
|
|---|
| 123 | * A CPU must be present to be considered just offline.
|
|---|
| 124 | */
|
|---|
| 125 | else if ( RTMpIsCpuPresent(idCpu1)
|
|---|
| 126 | && RTMpIsCpuPresent(idCpu2))
|
|---|
| 127 | rc = VERR_CPU_OFFLINE;
|
|---|
| 128 | else
|
|---|
| 129 | rc = VERR_CPU_NOT_FOUND;
|
|---|
| 130 | return rc;
|
|---|
| 131 | }
|
|---|
| 132 |
|
|---|
| 133 |
|
|---|
| 134 | RTDECL(bool) RTMpOnPairIsConcurrentExecSupported(void)
|
|---|
| 135 | {
|
|---|
| 136 | return RTMpOnAllIsConcurrentSafe();
|
|---|
| 137 | }
|
|---|
| 138 |
|
|---|
