| 1 | /* $Id: timesup.cpp 54215 2015-02-16 12:33:36Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Time using SUPLib.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2015 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.215389.xyz. 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 | #define LOG_GROUP RTLOGGROUP_TIME
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| 32 | #include <iprt/time.h>
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| 33 | #include "internal/iprt.h"
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| 34 |
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| 35 | #include <iprt/assert.h>
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| 36 | #include <iprt/err.h>
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| 37 | #include <iprt/log.h>
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| 38 | #if !defined(IN_GUEST) && !defined(RT_NO_GIP)
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| 39 | # include <iprt/asm.h>
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| 40 | # include <iprt/asm-amd64-x86.h>
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| 41 | # include <iprt/x86.h>
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| 42 | # include <VBox/sup.h>
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| 43 | #endif
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| 44 | #include "internal/time.h"
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| 45 |
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| 46 |
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| 47 | /*******************************************************************************
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| 48 | * Internal Functions *
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| 49 | *******************************************************************************/
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| 50 | #if !defined(IN_GUEST) && !defined(RT_NO_GIP)
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| 51 | static DECLCALLBACK(void) rtTimeNanoTSInternalBitch(PRTTIMENANOTSDATA pData, uint64_t u64NanoTS, uint64_t u64DeltaPrev, uint64_t u64PrevNanoTS);
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| 52 | static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalFallback(PRTTIMENANOTSDATA pData);
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| 53 | static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalRediscover(PRTTIMENANOTSDATA pData);
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| 54 | #endif
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| 55 |
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| 56 |
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| 57 | /*******************************************************************************
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| 58 | * Global Variables *
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| 59 | *******************************************************************************/
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| 60 | #if !defined(IN_GUEST) && !defined(RT_NO_GIP)
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| 61 | /** The previous timestamp value returned by RTTimeNanoTS. */
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| 62 | static uint64_t g_TimeNanoTSPrev = 0;
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| 63 |
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| 64 | /** The RTTimeNanoTS data structure that's passed down to the worker functions. */
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| 65 | static RTTIMENANOTSDATA g_TimeNanoTSData =
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| 66 | {
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| 67 | /* .pu64Prev = */ &g_TimeNanoTSPrev,
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| 68 | /* .pfnBad = */ rtTimeNanoTSInternalBitch,
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| 69 | /* .pfnRediscover = */ rtTimeNanoTSInternalRediscover,
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| 70 | /* .pvDummy = */ NULL,
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| 71 | /* .c1nsSteps = */ 0,
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| 72 | /* .cExpired = */ 0,
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| 73 | /* .cBadPrev = */ 0,
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| 74 | /* .cUpdateRaces = */ 0
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| 75 | };
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| 76 |
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| 77 | /** The index into g_apfnWorkers for the function to use.
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| 78 | * This cannot be a pointer because that'll break down in GC due to code relocation. */
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| 79 | static uint32_t g_iWorker = 0;
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| 80 | /** Array of rtTimeNanoTSInternal worker functions.
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| 81 | * This array is indexed by g_iWorker. */
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| 82 | static const PFNTIMENANOTSINTERNAL g_apfnWorkers[] =
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| 83 | {
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| 84 | # define RTTIMENANO_WORKER_DETECT 0
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| 85 | rtTimeNanoTSInternalRediscover,
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| 86 |
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| 87 | # define RTTIMENANO_WORKER_LEGACY_SYNC_NO_DELTA 1
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| 88 | RTTimeNanoTSLegacySyncNoDelta,
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| 89 | # define RTTIMENANO_WORKER_LEGACY_SYNC_WITH_DELTA 2
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| 90 | RTTimeNanoTSLegacySyncWithDelta,
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| 91 | # define RTTIMENANO_WORKER_LEGACY_ASYNC 3
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| 92 | RTTimeNanoTSLegacyAsync,
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| 93 | # define RTTIMENANO_WORKER_LEGACY_INVAR_NO_DELTA 4
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| 94 | RTTimeNanoTSLFenceInvariantNoDelta,
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| 95 | # define RTTIMENANO_WORKER_LEGACY_INVAR_WITH_DELTA 5
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| 96 | RTTimeNanoTSLFenceInvariantWithDelta,
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| 97 |
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| 98 | # define RTTIMENANO_WORKER_LFENCE_SYNC_NO_DELTA 6
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| 99 | RTTimeNanoTSLFenceSyncNoDelta,
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| 100 | # define RTTIMENANO_WORKER_LFENCE_SYNC_WITH_DELTA 7
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| 101 | RTTimeNanoTSLFenceSyncWithDelta,
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| 102 | # define RTTIMENANO_WORKER_LFENCE_ASYNC 8
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| 103 | RTTimeNanoTSLFenceAsync,
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| 104 | # define RTTIMENANO_WORKER_LFENCE_INVAR_NO_DELTA 9
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| 105 | RTTimeNanoTSLFenceInvariantNoDelta,
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| 106 | # define RTTIMENANO_WORKER_LFENCE_INVAR_WITH_DELTA 10
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| 107 | RTTimeNanoTSLFenceInvariantWithDelta,
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| 108 |
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| 109 | # define RTTIMENANO_WORKER_FALLBACK 11
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| 110 | rtTimeNanoTSInternalFallback,
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| 111 | };
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| 112 |
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| 113 |
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| 114 | /**
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| 115 | * Helper function that's used by the assembly routines when something goes bust.
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| 116 | *
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| 117 | * @param pData Pointer to the data structure.
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| 118 | * @param u64NanoTS The calculated nano ts.
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| 119 | * @param u64DeltaPrev The delta relative to the previously returned timestamp.
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| 120 | * @param u64PrevNanoTS The previously returned timestamp (as it was read it).
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| 121 | */
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| 122 | static DECLCALLBACK(void) rtTimeNanoTSInternalBitch(PRTTIMENANOTSDATA pData, uint64_t u64NanoTS, uint64_t u64DeltaPrev, uint64_t u64PrevNanoTS)
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| 123 | {
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| 124 | pData->cBadPrev++;
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| 125 | if ((int64_t)u64DeltaPrev < 0)
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| 126 | LogRel(("TM: u64DeltaPrev=%RI64 u64PrevNanoTS=0x%016RX64 u64NanoTS=0x%016RX64\n",
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| 127 | u64DeltaPrev, u64PrevNanoTS, u64NanoTS));
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| 128 | else
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| 129 | Log(("TM: u64DeltaPrev=%RI64 u64PrevNanoTS=0x%016RX64 u64NanoTS=0x%016RX64 (debugging?)\n",
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| 130 | u64DeltaPrev, u64PrevNanoTS, u64NanoTS));
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| 131 | }
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| 132 |
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| 133 | /**
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| 134 | * Fallback function.
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| 135 | */
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| 136 | static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalFallback(PRTTIMENANOTSDATA pData)
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| 137 | {
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| 138 | PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage;
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| 139 | if ( pGip
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| 140 | && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC
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| 141 | && ( pGip->u32Mode == SUPGIPMODE_INVARIANT_TSC
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| 142 | || pGip->u32Mode == SUPGIPMODE_SYNC_TSC
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| 143 | || pGip->u32Mode == SUPGIPMODE_ASYNC_TSC))
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| 144 | return rtTimeNanoTSInternalRediscover(pData);
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| 145 | NOREF(pData);
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| 146 | # ifndef IN_RC
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| 147 | return RTTimeSystemNanoTS();
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| 148 | # else
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| 149 | return 0;
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| 150 | # endif
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| 151 | }
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| 152 |
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| 153 |
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| 154 | /**
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| 155 | * Checks if we really need to apply the delta values.
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| 156 | *
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| 157 | * Getting the delta for a CPU is _very_ expensive, it more than doubles the
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| 158 | * execution time for RTTimeNanoTS.
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| 159 | *
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| 160 | * @returns true if deltas needs to be applied, false if not.
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| 161 | * @param pGip The GIP.
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| 162 | *
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| 163 | * @remarks If you change this, make sure to also change tmR3ReallyNeedDeltas().
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| 164 | */
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| 165 | static bool rtTimeNanoTsInternalReallyNeedDeltas(PSUPGLOBALINFOPAGE pGip)
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| 166 | {
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| 167 | return !pGip->fOsTscDeltasInSync && !pGip->fTscDeltasRoughlyInSync;
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| 168 | #if 0
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| 169 | if (!pGip->fOsTscDeltasInSync)
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| 170 | {
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| 171 | uint32_t i = pGip->cCpus;
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| 172 | while (i-- > 0)
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| 173 | if ( pGip->aCPUs[i].enmState == SUPGIPCPUSTATE_ONLINE
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| 174 | && ( pGip->aCPUs[i].i64TSCDelta > 384
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| 175 | || pGip->aCPUs[i].i64TSCDelta < -384) )
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| 176 | return true;
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| 177 | }
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| 178 | return false;
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| 179 | #endif
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| 180 | }
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| 181 |
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| 182 |
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| 183 | /**
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| 184 | * Called the first time somebody asks for the time or when the GIP
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| 185 | * is mapped/unmapped.
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| 186 | */
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| 187 | static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalRediscover(PRTTIMENANOTSDATA pData)
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| 188 | {
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| 189 | uint32_t iWorker;
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| 190 | PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage;
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| 191 | if ( pGip
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| 192 | && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC
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| 193 | && ( pGip->u32Mode == SUPGIPMODE_INVARIANT_TSC
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| 194 | || pGip->u32Mode == SUPGIPMODE_SYNC_TSC
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| 195 | || pGip->u32Mode == SUPGIPMODE_ASYNC_TSC))
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| 196 | {
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| 197 | if (ASMCpuId_EDX(1) & X86_CPUID_FEATURE_EDX_SSE2)
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| 198 | iWorker = pGip->u32Mode == SUPGIPMODE_INVARIANT_TSC
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| 199 | ? rtTimeNanoTsInternalReallyNeedDeltas(pGip)
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| 200 | ? RTTIMENANO_WORKER_LFENCE_INVAR_WITH_DELTA : RTTIMENANO_WORKER_LFENCE_INVAR_NO_DELTA
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| 201 | : pGip->u32Mode == SUPGIPMODE_SYNC_TSC
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| 202 | ? false /** @todo !rtTimeNanoTsInternalReallyNeedDeltas(pGip) */
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| 203 | ? RTTIMENANO_WORKER_LFENCE_SYNC_WITH_DELTA : RTTIMENANO_WORKER_LFENCE_SYNC_NO_DELTA
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| 204 | : RTTIMENANO_WORKER_LFENCE_ASYNC;
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| 205 | else
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| 206 | iWorker = pGip->u32Mode == SUPGIPMODE_INVARIANT_TSC
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| 207 | ? rtTimeNanoTsInternalReallyNeedDeltas(pGip)
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| 208 | ? RTTIMENANO_WORKER_LEGACY_INVAR_WITH_DELTA : RTTIMENANO_WORKER_LEGACY_INVAR_NO_DELTA
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| 209 | : pGip->u32Mode == SUPGIPMODE_SYNC_TSC
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| 210 | ? false /** @todo rtTimeNanoTsInternalReallyNeedDeltas(pGip) */
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| 211 | ? RTTIMENANO_WORKER_LEGACY_SYNC_WITH_DELTA : RTTIMENANO_WORKER_LEGACY_SYNC_NO_DELTA
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| 212 | : RTTIMENANO_WORKER_LEGACY_ASYNC;
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| 213 | }
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| 214 | else
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| 215 | iWorker = RTTIMENANO_WORKER_FALLBACK;
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| 216 |
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| 217 | ASMAtomicWriteU32((uint32_t volatile *)&g_iWorker, iWorker);
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| 218 | return g_apfnWorkers[iWorker](pData);
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| 219 | }
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| 220 |
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| 221 | #endif /* !IN_GUEST && !RT_NO_GIP */
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| 222 |
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| 223 |
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| 224 | /**
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| 225 | * Internal worker for getting the current nanosecond timestamp.
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| 226 | */
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| 227 | DECLINLINE(uint64_t) rtTimeNanoTSInternal(void)
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| 228 | {
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| 229 | #if !defined(IN_GUEST) && !defined(RT_NO_GIP)
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| 230 | return g_apfnWorkers[g_iWorker](&g_TimeNanoTSData);
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| 231 | #else
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| 232 | return RTTimeSystemNanoTS();
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| 233 | #endif
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| 234 | }
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| 235 |
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| 236 |
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| 237 | /**
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| 238 | * Gets the current nanosecond timestamp.
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| 239 | *
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| 240 | * @returns nanosecond timestamp.
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| 241 | */
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| 242 | RTDECL(uint64_t) RTTimeNanoTS(void)
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| 243 | {
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| 244 | return rtTimeNanoTSInternal();
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| 245 | }
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| 246 | RT_EXPORT_SYMBOL(RTTimeNanoTS);
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| 247 |
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| 248 |
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| 249 | /**
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| 250 | * Gets the current millisecond timestamp.
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| 251 | *
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| 252 | * @returns millisecond timestamp.
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| 253 | */
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| 254 | RTDECL(uint64_t) RTTimeMilliTS(void)
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| 255 | {
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| 256 | return rtTimeNanoTSInternal() / 1000000;
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| 257 | }
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| 258 | RT_EXPORT_SYMBOL(RTTimeMilliTS);
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| 259 |
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| 260 |
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| 261 | #if !defined(IN_GUEST) && !defined(RT_NO_GIP)
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| 262 | /**
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| 263 | * Debugging the time api.
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| 264 | *
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| 265 | * @returns the number of 1ns steps which has been applied by RTTimeNanoTS().
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| 266 | */
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| 267 | RTDECL(uint32_t) RTTimeDbgSteps(void)
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| 268 | {
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| 269 | return g_TimeNanoTSData.c1nsSteps;
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| 270 | }
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| 271 | RT_EXPORT_SYMBOL(RTTimeDbgSteps);
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| 272 |
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| 273 |
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| 274 | /**
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| 275 | * Debugging the time api.
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| 276 | *
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| 277 | * @returns the number of times the TSC interval expired RTTimeNanoTS().
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| 278 | */
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| 279 | RTDECL(uint32_t) RTTimeDbgExpired(void)
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| 280 | {
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| 281 | return g_TimeNanoTSData.cExpired;
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| 282 | }
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| 283 | RT_EXPORT_SYMBOL(RTTimeDbgExpired);
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| 284 |
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| 285 |
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| 286 | /**
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| 287 | * Debugging the time api.
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| 288 | *
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| 289 | * @returns the number of bad previous values encountered by RTTimeNanoTS().
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| 290 | */
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| 291 | RTDECL(uint32_t) RTTimeDbgBad(void)
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| 292 | {
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| 293 | return g_TimeNanoTSData.cBadPrev;
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| 294 | }
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| 295 | RT_EXPORT_SYMBOL(RTTimeDbgBad);
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| 296 |
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| 297 |
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| 298 | /**
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| 299 | * Debugging the time api.
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| 300 | *
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| 301 | * @returns the number of update races in RTTimeNanoTS().
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| 302 | */
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| 303 | RTDECL(uint32_t) RTTimeDbgRaces(void)
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| 304 | {
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| 305 | return g_TimeNanoTSData.cUpdateRaces;
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| 306 | }
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| 307 | RT_EXPORT_SYMBOL(RTTimeDbgRaces);
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| 308 | #endif /* !IN_GUEST && !RT_NO_GIP */
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| 309 |
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