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/* $Id: mpnotification-r0drv-solaris.c $ */
/** @file
* IPRT - Multiprocessor Event Notifications, Ring-0 Driver, Solaris.
*/
/*
* Copyright (C) 2008-2012 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include "the-solaris-kernel.h"
#include "internal/iprt.h"
#include <iprt/err.h>
#include <iprt/mp.h>
#include <iprt/cpuset.h>
#include <iprt/string.h>
#include <iprt/thread.h>
#include "r0drv/mp-r0drv.h"
/*******************************************************************************
* Global Variables *
*******************************************************************************/
/** Whether CPUs are being watched or not. */
static volatile bool g_fSolCpuWatch = false;
/** Set of online cpus that is maintained by the MP callback.
* This avoids locking issues querying the set from the kernel as well as
* eliminating any uncertainty regarding the online status during the
* callback. */
RTCPUSET g_rtMpSolCpuSet;
/**
* Internal solaris representation for watching CPUs.
*/
typedef struct RTMPSOLWATCHCPUS
{
/** Function pointer to Mp worker. */
PFNRTMPWORKER pfnWorker;
/** Argument to pass to the Mp worker. */
void *pvArg;
} RTMPSOLWATCHCPUS;
typedef RTMPSOLWATCHCPUS *PRTMPSOLWATCHCPUS;
/**
* PFNRTMPWORKER worker for executing Mp events on the target CPU.
*
* @param idCpu The current CPU Id.
* @param pvArg Opaque pointer to event type (online/offline).
* @param pvIgnored1 Ignored.
*/
static void rtMpNotificationSolOnCurrentCpu(RTCPUID idCpu, void *pvArg, void *pvIgnored1)
{
NOREF(pvIgnored1);
NOREF(idCpu);
PRTMPARGS pArgs = (PRTMPARGS)pvArg;
AssertRelease(pArgs && pArgs->idCpu == RTMpCpuId());
Assert(pArgs->pvUser1);
Assert(!RTThreadPreemptIsEnabled(NIL_RTTHREAD));
RTMPEVENT enmMpEvent = *(RTMPEVENT *)pArgs->pvUser1;
rtMpNotificationDoCallbacks(enmMpEvent, pArgs->idCpu);
}
/**
* Solaris callback function for Mp event notification.
*
* @param CpuState The current event/state of the CPU.
* @param iCpu Which CPU is this event fore.
* @param pvArg Ignored.
*
* @remarks This function assumes index == RTCPUID.
* @returns Solaris error code.
*/
static int rtMpNotificationCpuEvent(cpu_setup_t CpuState, int iCpu, void *pvArg)
{
RTMPEVENT enmMpEvent;
RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
RTThreadPreemptDisable(&PreemptState);
/*
* Update our CPU set structures first regardless of whether we've been
* scheduled on the right CPU or not, this is just atomic accounting.
*/
if (CpuState == CPU_ON)
{
enmMpEvent = RTMPEVENT_ONLINE;
RTCpuSetAdd(&g_rtMpSolCpuSet, iCpu);
}
else if (CpuState == CPU_OFF)
{
enmMpEvent = RTMPEVENT_OFFLINE;
RTCpuSetDel(&g_rtMpSolCpuSet, iCpu);
}
else
return 0;
/*
* Since we don't absolutely need to do CPU bound code in any of the CPU offline
* notification hooks, run it on the current CPU. Scheduling a callback to execute
* on the CPU going offline at this point is too late and will not work reliably.
*/
bool fRunningOnTargetCpu = iCpu == RTMpCpuId();
if ( fRunningOnTargetCpu == true
|| enmMpEvent == RTMPEVENT_OFFLINE)
{
rtMpNotificationDoCallbacks(enmMpEvent, iCpu);
}
else
{
/*
* We're not on the target CPU, schedule (synchronous) the event notification callback
* to run on the target CPU i.e. the CPU that was online'd.
*/
RTMPARGS Args;
RT_ZERO(Args);
Args.pvUser1 = &enmMpEvent;
Args.pvUser2 = NULL;
Args.idCpu = iCpu;
RTMpOnSpecific(iCpu, rtMpNotificationSolOnCurrentCpu, &Args, NULL /* pvIgnored1 */);
}
RTThreadPreemptRestore(&PreemptState);
NOREF(pvArg);
return 0;
}
DECLHIDDEN(int) rtR0MpNotificationNativeInit(void)
{
if (ASMAtomicReadBool(&g_fSolCpuWatch) == true)
return VERR_WRONG_ORDER;
/*
* Register the callback building the online cpu set as we do so.
*/
RTCpuSetEmpty(&g_rtMpSolCpuSet);
mutex_enter(&cpu_lock);
register_cpu_setup_func(rtMpNotificationCpuEvent, NULL /* pvArg */);
for (int i = 0; i < (int)RTMpGetCount(); ++i)
if (cpu_is_online(cpu[i]))
rtMpNotificationCpuEvent(CPU_ON, i, NULL /* pvArg */);
ASMAtomicWriteBool(&g_fSolCpuWatch, true);
mutex_exit(&cpu_lock);
return VINF_SUCCESS;
}
DECLHIDDEN(void) rtR0MpNotificationNativeTerm(void)
{
if (ASMAtomicReadBool(&g_fSolCpuWatch) == true)
{
mutex_enter(&cpu_lock);
unregister_cpu_setup_func(rtMpNotificationCpuEvent, NULL /* pvArg */);
ASMAtomicWriteBool(&g_fSolCpuWatch, false);
mutex_exit(&cpu_lock);
}
}
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