| 1 | /* $Id: mp-linux.cpp 100194 2023-06-16 08:19:12Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Multiprocessor, Linux.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #define LOG_GROUP RTLOGGROUP_SYSTEM
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| 42 | #include <stdio.h>
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| 43 | #include <errno.h>
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| 44 |
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| 45 | #include <iprt/mp.h>
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| 46 | #include "internal/iprt.h"
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| 47 |
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| 48 | #include <iprt/alloca.h>
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| 49 | #include <iprt/cpuset.h>
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| 50 | #include <iprt/assert.h>
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| 51 | #include <iprt/string.h>
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| 52 | #include <iprt/linux/sysfs.h>
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| 53 |
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| 54 |
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| 55 | #if defined(RT_ARCH_ARM64) || defined(RT_ARCH_ARM32)
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| 56 | # include <sched.h>
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| 57 |
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| 58 | RTDECL(RTCPUID) RTMpCpuId(void)
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| 59 | {
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| 60 | int rc = sched_getcpu();
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| 61 | if (rc >= 0)
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| 62 | return (RTCPUID)rc;
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| 63 |
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| 64 | return NIL_RTCPUID;
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| 65 | }
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| 66 | #endif
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| 67 |
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| 68 | /**
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| 69 | * Internal worker that determines the max possible CPU count.
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| 70 | *
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| 71 | * @returns Max cpus.
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| 72 | */
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| 73 | static RTCPUID rtMpLinuxMaxCpus(void)
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| 74 | {
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| 75 | #if 0 /* this doesn't do the right thing :-/ */
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| 76 | int cMax = sysconf(_SC_NPROCESSORS_CONF);
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| 77 | Assert(cMax >= 1);
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| 78 | return cMax;
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| 79 | #else
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| 80 | static uint32_t s_cMax = 0;
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| 81 | if (!s_cMax)
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| 82 | {
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| 83 | int cMax = 1;
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| 84 | for (unsigned iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
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| 85 | if (RTLinuxSysFsExists("devices/system/cpu/cpu%d", iCpu))
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| 86 | cMax = iCpu + 1;
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| 87 | ASMAtomicUoWriteU32((uint32_t volatile *)&s_cMax, cMax);
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| 88 | return cMax;
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| 89 | }
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| 90 | return s_cMax;
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| 91 | #endif
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| 92 | }
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| 93 |
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| 94 | /**
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| 95 | * Internal worker that picks the processor speed in MHz from /proc/cpuinfo.
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| 96 | *
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| 97 | * @returns CPU frequency.
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| 98 | */
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| 99 | static uint32_t rtMpLinuxGetFrequency(RTCPUID idCpu)
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| 100 | {
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| 101 | FILE *pFile = fopen("/proc/cpuinfo", "r");
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| 102 | if (!pFile)
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| 103 | return 0;
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| 104 |
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| 105 | char sz[256];
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| 106 | RTCPUID idCpuFound = NIL_RTCPUID;
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| 107 | uint32_t Frequency = 0;
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| 108 | while (fgets(sz, sizeof(sz), pFile))
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| 109 | {
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| 110 | char *psz;
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| 111 | if ( !strncmp(sz, RT_STR_TUPLE("processor"))
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| 112 | && (sz[10] == ' ' || sz[10] == '\t' || sz[10] == ':')
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| 113 | && (psz = strchr(sz, ':')))
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| 114 | {
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| 115 | psz += 2;
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| 116 | int64_t iCpu;
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| 117 | int rc = RTStrToInt64Ex(psz, NULL, 0, &iCpu);
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| 118 | if (RT_SUCCESS(rc))
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| 119 | idCpuFound = iCpu;
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| 120 | }
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| 121 | else if ( idCpu == idCpuFound
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| 122 | && !strncmp(sz, RT_STR_TUPLE("cpu MHz"))
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| 123 | && (sz[10] == ' ' || sz[10] == '\t' || sz[10] == ':')
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| 124 | && (psz = strchr(sz, ':')))
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| 125 | {
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| 126 | psz += 2;
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| 127 | int64_t v;
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| 128 | int rc = RTStrToInt64Ex(psz, &psz, 0, &v);
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| 129 | if (RT_SUCCESS(rc))
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| 130 | {
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| 131 | Frequency = v;
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| 132 | break;
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| 133 | }
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| 134 | }
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| 135 | }
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| 136 | fclose(pFile);
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| 137 | return Frequency;
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| 138 | }
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| 139 |
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| 140 |
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| 141 | /** @todo RTmpCpuId(). */
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| 142 |
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| 143 | RTDECL(int) RTMpCpuIdToSetIndex(RTCPUID idCpu)
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| 144 | {
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| 145 | return idCpu < rtMpLinuxMaxCpus() ? (int)idCpu : -1;
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| 146 | }
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| 147 |
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| 148 |
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| 149 | RTDECL(RTCPUID) RTMpCpuIdFromSetIndex(int iCpu)
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| 150 | {
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| 151 | return (unsigned)iCpu < rtMpLinuxMaxCpus() ? iCpu : NIL_RTCPUID;
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| 152 | }
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| 153 |
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| 154 |
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| 155 | RTDECL(RTCPUID) RTMpGetMaxCpuId(void)
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| 156 | {
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| 157 | return rtMpLinuxMaxCpus() - 1;
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| 158 | }
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| 159 |
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| 160 |
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| 161 | RTDECL(bool) RTMpIsCpuOnline(RTCPUID idCpu)
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| 162 | {
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| 163 | /** @todo check if there is a simpler interface than this... */
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| 164 | int64_t i = 0;
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| 165 | int rc = RTLinuxSysFsReadIntFile(0, &i, "devices/system/cpu/cpu%d/online", (int)idCpu);
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| 166 | if ( RT_FAILURE(rc)
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| 167 | && RTLinuxSysFsExists("devices/system/cpu/cpu%d", (int)idCpu))
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| 168 | {
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| 169 | /** @todo Assert(!RTLinuxSysFsExists("devices/system/cpu/cpu%d/online",
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| 170 | * (int)idCpu));
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| 171 | * Unfortunately, the online file wasn't always world readable (centos
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| 172 | * 2.6.18-164). */
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| 173 | i = 1;
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| 174 | rc = VINF_SUCCESS;
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| 175 | }
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| 176 |
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| 177 | AssertMsg(i == 0 || i == -1 || i == 1, ("i=%d\n", i));
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| 178 | return RT_SUCCESS(rc) && i != 0;
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| 179 | }
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| 180 |
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| 181 |
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| 182 | RTDECL(bool) RTMpIsCpuPossible(RTCPUID idCpu)
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| 183 | {
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| 184 | /** @todo check this up with hotplugging! */
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| 185 | return RTLinuxSysFsExists("devices/system/cpu/cpu%d", (int)idCpu);
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| 186 | }
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| 187 |
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| 188 |
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| 189 | RTDECL(PRTCPUSET) RTMpGetSet(PRTCPUSET pSet)
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| 190 | {
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| 191 | RTCpuSetEmpty(pSet);
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| 192 | RTCPUID cMax = rtMpLinuxMaxCpus();
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| 193 | for (RTCPUID idCpu = 0; idCpu < cMax; idCpu++)
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| 194 | if (RTMpIsCpuPossible(idCpu))
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| 195 | RTCpuSetAdd(pSet, idCpu);
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| 196 | return pSet;
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| 197 | }
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| 198 |
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| 199 |
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| 200 | RTDECL(RTCPUID) RTMpGetCount(void)
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| 201 | {
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| 202 | RTCPUSET Set;
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| 203 | RTMpGetSet(&Set);
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| 204 | return RTCpuSetCount(&Set);
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| 205 | }
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| 206 |
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| 207 |
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| 208 | RTDECL(RTCPUID) RTMpGetCoreCount(void)
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| 209 | {
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| 210 | RTCPUID cMax = rtMpLinuxMaxCpus();
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| 211 | uint32_t *paidCores = (uint32_t *)alloca(sizeof(paidCores[0]) * (cMax + 1));
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| 212 | uint32_t *paidPckgs = (uint32_t *)alloca(sizeof(paidPckgs[0]) * (cMax + 1));
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| 213 | uint32_t cCores = 0;
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| 214 | for (RTCPUID idCpu = 0; idCpu < cMax; idCpu++)
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| 215 | {
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| 216 | if (RTMpIsCpuPossible(idCpu))
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| 217 | {
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| 218 | int64_t idCore = 0;
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| 219 | int64_t idPckg = 0;
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| 220 |
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| 221 | int rc = RTLinuxSysFsReadIntFile(0, &idCore, "devices/system/cpu/cpu%d/topology/core_id", (int)idCpu);
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| 222 | if (RT_SUCCESS(rc))
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| 223 | rc = RTLinuxSysFsReadIntFile(0, &idPckg, "devices/system/cpu/cpu%d/topology/physical_package_id", (int)idCpu);
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| 224 |
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| 225 | if (RT_SUCCESS(rc))
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| 226 | {
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| 227 | uint32_t i;
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| 228 |
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| 229 | for (i = 0; i < cCores; i++)
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| 230 | if ( paidCores[i] == (uint32_t)idCore
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| 231 | && paidPckgs[i] == (uint32_t)idPckg)
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| 232 | break;
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| 233 | if (i >= cCores)
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| 234 | {
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| 235 | paidCores[cCores] = (uint32_t)idCore;
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| 236 | paidPckgs[cCores] = (uint32_t)idPckg;
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| 237 | cCores++;
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| 238 | }
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| 239 | }
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| 240 | }
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| 241 | }
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| 242 | Assert(cCores > 0);
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| 243 | return cCores;
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| 244 | }
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| 245 |
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| 246 |
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| 247 | RTDECL(PRTCPUSET) RTMpGetOnlineSet(PRTCPUSET pSet)
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| 248 | {
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| 249 | RTCpuSetEmpty(pSet);
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| 250 | RTCPUID cMax = rtMpLinuxMaxCpus();
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| 251 | for (RTCPUID idCpu = 0; idCpu < cMax; idCpu++)
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| 252 | if (RTMpIsCpuOnline(idCpu))
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| 253 | RTCpuSetAdd(pSet, idCpu);
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| 254 | return pSet;
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| 255 | }
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| 256 |
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| 257 |
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| 258 | RTDECL(RTCPUID) RTMpGetOnlineCount(void)
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| 259 | {
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| 260 | RTCPUSET Set;
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| 261 | RTMpGetOnlineSet(&Set);
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| 262 | return RTCpuSetCount(&Set);
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| 263 | }
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| 264 |
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| 265 |
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| 266 | RTDECL(RTCPUID) RTMpGetOnlineCoreCount(void)
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| 267 | {
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| 268 | RTCPUID cMax = rtMpLinuxMaxCpus();
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| 269 | uint32_t *paidCores = (uint32_t *)alloca(sizeof(paidCores[0]) * (cMax + 1));
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| 270 | uint32_t *paidPckgs = (uint32_t *)alloca(sizeof(paidPckgs[0]) * (cMax + 1));
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| 271 | uint32_t cCores = 0;
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| 272 | for (RTCPUID idCpu = 0; idCpu < cMax; idCpu++)
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| 273 | {
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| 274 | if (RTMpIsCpuOnline(idCpu))
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| 275 | {
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| 276 | int64_t idCore = 0;
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| 277 | int64_t idPckg = 0;
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| 278 |
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| 279 | int rc = RTLinuxSysFsReadIntFile(0, &idCore, "devices/system/cpu/cpu%d/topology/core_id", (int)idCpu);
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| 280 | if (RT_SUCCESS(rc))
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| 281 | rc = RTLinuxSysFsReadIntFile(0, &idPckg, "devices/system/cpu/cpu%d/topology/physical_package_id", (int)idCpu);
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| 282 |
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| 283 | if (RT_SUCCESS(rc))
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| 284 | {
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| 285 | uint32_t i;
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| 286 |
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| 287 | for (i = 0; i < cCores; i++)
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| 288 | if ( paidCores[i] == idCore
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| 289 | && paidPckgs[i] == idPckg)
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| 290 | break;
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| 291 | if (i >= cCores)
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| 292 | {
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| 293 | paidCores[cCores] = idCore;
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| 294 | paidPckgs[cCores] = idPckg;
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| 295 | cCores++;
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| 296 | }
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| 297 | }
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| 298 | }
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| 299 | }
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| 300 | Assert(cCores > 0);
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| 301 | return cCores;
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| 302 | }
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| 303 |
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| 304 |
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| 305 |
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| 306 | RTDECL(uint32_t) RTMpGetCurFrequency(RTCPUID idCpu)
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| 307 | {
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| 308 | int64_t kHz = 0;
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| 309 | int rc = RTLinuxSysFsReadIntFile(0, &kHz, "devices/system/cpu/cpu%d/cpufreq/cpuinfo_cur_freq", (int)idCpu);
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| 310 | if (RT_FAILURE(rc))
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| 311 | {
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| 312 | /*
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| 313 | * The file may be just unreadable - in that case use plan B, i.e.
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| 314 | * /proc/cpuinfo to get the data we want. The assumption is that if
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| 315 | * cpuinfo_cur_freq doesn't exist then the speed won't change, and
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| 316 | * thus cur == max. If it does exist then cpuinfo contains the
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| 317 | * current frequency.
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| 318 | */
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| 319 | kHz = rtMpLinuxGetFrequency(idCpu) * 1000;
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| 320 | }
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| 321 | return (kHz + 999) / 1000;
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| 322 | }
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| 323 |
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| 324 |
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| 325 | RTDECL(uint32_t) RTMpGetMaxFrequency(RTCPUID idCpu)
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| 326 | {
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| 327 | int64_t kHz = 0;
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| 328 | int rc = RTLinuxSysFsReadIntFile(0, &kHz, "devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", (int)idCpu);
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| 329 | if (RT_FAILURE(rc))
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| 330 | {
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| 331 | /*
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| 332 | * Check if the file isn't there - if it is there, then /proc/cpuinfo
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| 333 | * would provide current frequency information, which is wrong.
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| 334 | */
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| 335 | if (!RTLinuxSysFsExists("devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", (int)idCpu))
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| 336 | kHz = rtMpLinuxGetFrequency(idCpu) * 1000;
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| 337 | else
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| 338 | kHz = 0;
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| 339 | }
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| 340 | return (kHz + 999) / 1000;
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| 341 | }
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