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/* $Id: mp-freebsd.cpp $ */
/** @file
* IPRT - Multiprocessor, FreeBSD.
*/
/*
* Copyright (C) 2008-2020 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 *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_SYSTEM
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <sys/sysctl.h>
#include <iprt/mp.h>
#include <iprt/cpuset.h>
#include <iprt/assert.h>
#include <iprt/string.h>
#include <iprt/alloc.h>
#include <iprt/log.h>
#include <iprt/once.h>
#include <iprt/critsect.h>
/**
* Internal worker that determines the max possible CPU count.
*
* @returns Max cpus.
*/
static RTCPUID rtMpFreeBsdMaxCpus(void)
{
int aiMib[2];
aiMib[0] = CTL_HW;
aiMib[1] = HW_NCPU;
int cCpus = -1;
size_t cb = sizeof(cCpus);
int rc = sysctl(aiMib, RT_ELEMENTS(aiMib), &cCpus, &cb, NULL, 0);
if (rc != -1 && cCpus >= 1)
return cCpus;
AssertFailed();
return 1;
}
RTDECL(int) RTMpCpuIdToSetIndex(RTCPUID idCpu)
{
return idCpu < RTCPUSET_MAX_CPUS && idCpu < rtMpFreeBsdMaxCpus() ? idCpu : -1;
}
RTDECL(RTCPUID) RTMpCpuIdFromSetIndex(int iCpu)
{
return (unsigned)iCpu < rtMpFreeBsdMaxCpus() ? iCpu : NIL_RTCPUID;
}
RTDECL(RTCPUID) RTMpGetMaxCpuId(void)
{
return rtMpFreeBsdMaxCpus() - 1;
}
RTDECL(bool) RTMpIsCpuOnline(RTCPUID idCpu)
{
/*
* FreeBSD doesn't support CPU hotplugging so every CPU which appears
* in the tree is also online.
*/
char szName[40];
RTStrPrintf(szName, sizeof(szName), "dev.cpu.%d.%%driver", (int)idCpu);
char szDriver[10];
size_t cbDriver = sizeof(szDriver);
RT_ZERO(szDriver); /* this shouldn't be necessary. */
int rcBsd = sysctlbyname(szName, szDriver, &cbDriver, NULL, 0);
if (rcBsd == 0)
return true;
return false;
}
RTDECL(bool) RTMpIsCpuPossible(RTCPUID idCpu)
{
return idCpu != NIL_RTCPUID
&& idCpu < rtMpFreeBsdMaxCpus();
}
RTDECL(PRTCPUSET) RTMpGetSet(PRTCPUSET pSet)
{
RTCpuSetEmpty(pSet);
RTCPUID cMax = rtMpFreeBsdMaxCpus();
for (RTCPUID idCpu = 0; idCpu < cMax; idCpu++)
if (RTMpIsCpuPossible(idCpu))
RTCpuSetAdd(pSet, idCpu);
return pSet;
}
RTDECL(RTCPUID) RTMpGetCount(void)
{
return rtMpFreeBsdMaxCpus();
}
RTDECL(PRTCPUSET) RTMpGetOnlineSet(PRTCPUSET pSet)
{
RTCpuSetEmpty(pSet);
RTCPUID cMax = rtMpFreeBsdMaxCpus();
for (RTCPUID idCpu = 0; idCpu < cMax; idCpu++)
if (RTMpIsCpuOnline(idCpu))
RTCpuSetAdd(pSet, idCpu);
return pSet;
}
RTDECL(RTCPUID) RTMpGetOnlineCount(void)
{
/*
* FreeBSD has sysconf.
*/
return sysconf(_SC_NPROCESSORS_ONLN);
}
RTDECL(uint32_t) RTMpGetCurFrequency(RTCPUID idCpu)
{
int uFreqCurr = 0;
size_t cbParameter = sizeof(uFreqCurr);
if (!RTMpIsCpuOnline(idCpu))
return 0;
/* CPU's have a common frequency. */
int rc = sysctlbyname("dev.cpu.0.freq", &uFreqCurr, &cbParameter, NULL, 0);
if (rc)
return 0;
return (uint32_t)uFreqCurr;
}
RTDECL(uint32_t) RTMpGetMaxFrequency(RTCPUID idCpu)
{
char szFreqLevels[20]; /* Should be enough to get the highest level which is always the first. */
size_t cbFreqLevels = sizeof(szFreqLevels);
if (!RTMpIsCpuOnline(idCpu))
return 0;
memset(szFreqLevels, 0, sizeof(szFreqLevels));
/*
* CPU 0 has the freq levels entry. ENOMEM is ok as we don't need all supported
* levels but only the first one.
*/
int rc = sysctlbyname("dev.cpu.0.freq_levels", szFreqLevels, &cbFreqLevels, NULL, 0);
if ( (rc && (errno != ENOMEM))
|| (cbFreqLevels == 0))
return 0;
/* Clear everything starting from the '/' */
unsigned i = 0;
do
{
if (szFreqLevels[i] == '/')
{
memset(&szFreqLevels[i], 0, sizeof(szFreqLevels) - i);
break;
}
i++;
} while (i < sizeof(szFreqLevels));
/* Returns 0 on failure. */
return RTStrToUInt32(szFreqLevels);
}
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