diff options
Diffstat (limited to 'src/VBox/Runtime/common/time/timesup.cpp')
| -rw-r--r-- | src/VBox/Runtime/common/time/timesup.cpp | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/time/timesup.cpp b/src/VBox/Runtime/common/time/timesup.cpp new file mode 100644 index 00000000..1bcc3984 --- /dev/null +++ b/src/VBox/Runtime/common/time/timesup.cpp @@ -0,0 +1,375 @@ +/* $Id: timesup.cpp $ */ +/** @file + * IPRT - Time using SUPLib. + */ + +/* + * Copyright (C) 2006-2019 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_TIME +#include <iprt/time.h> +#include "internal/iprt.h" + +#include <iprt/assert.h> +#include <iprt/errcore.h> +#include <iprt/log.h> +#if !defined(IN_GUEST) && !defined(RT_NO_GIP) +# include <iprt/asm.h> +# include <iprt/asm-amd64-x86.h> +# include <iprt/x86.h> +# include <VBox/sup.h> +#endif +#include "internal/time.h" + + +/********************************************************************************************************************************* +* Internal Functions * +*********************************************************************************************************************************/ +#if !defined(IN_GUEST) && !defined(RT_NO_GIP) +static DECLCALLBACK(void) rtTimeNanoTSInternalBitch(PRTTIMENANOTSDATA pData, uint64_t u64NanoTS, uint64_t u64DeltaPrev, uint64_t u64PrevNanoTS); +static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalFallback(PRTTIMENANOTSDATA pData); +static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalRediscover(PRTTIMENANOTSDATA pData); +static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalBadCpuIndex(PRTTIMENANOTSDATA pData, uint16_t idApic, uint16_t iCpuSet, uint16_t iGipCpu); +#endif + + +/********************************************************************************************************************************* +* Global Variables * +*********************************************************************************************************************************/ +#if !defined(IN_GUEST) && !defined(RT_NO_GIP) +/** The previous timestamp value returned by RTTimeNanoTS. */ +static uint64_t g_TimeNanoTSPrev = 0; + +/** The RTTimeNanoTS data structure that's passed down to the worker functions. */ +static RTTIMENANOTSDATA g_TimeNanoTSData = +{ + /* .pu64Prev = */ &g_TimeNanoTSPrev, + /* .pfnBad = */ rtTimeNanoTSInternalBitch, + /* .pfnRediscover = */ rtTimeNanoTSInternalRediscover, + /* .pfnBadCpuIndex = */ rtTimeNanoTSInternalBadCpuIndex, + /* .c1nsSteps = */ 0, + /* .cExpired = */ 0, + /* .cBadPrev = */ 0, + /* .cUpdateRaces = */ 0 +}; + +# ifdef IN_RC +/** Array of rtTimeNanoTSInternal worker functions. + * This array is indexed by g_iWorker. */ +static const PFNTIMENANOTSINTERNAL g_apfnWorkers[] = +{ +# define RTTIMENANO_WORKER_DETECT 0 + rtTimeNanoTSInternalRediscover, + +# define RTTIMENANO_WORKER_LEGACY_SYNC_INVAR_NO_DELTA 1 + RTTimeNanoTSLegacySyncInvarNoDelta, +# define RTTIMENANO_WORKER_LEGACY_SYNC_INVAR_WITH_DELTA 2 + RTTimeNanoTSLegacySyncInvarWithDelta, +# define RTTIMENANO_WORKER_LEGACY_ASYNC 3 + RTTimeNanoTSLegacyAsync, + +# define RTTIMENANO_WORKER_LFENCE_SYNC_INVAR_NO_DELTA 4 + RTTimeNanoTSLFenceSyncInvarNoDelta, +# define RTTIMENANO_WORKER_LFENCE_SYNC_INVAR_WITH_DELTA 5 + RTTimeNanoTSLFenceSyncInvarWithDelta, +# define RTTIMENANO_WORKER_LFENCE_ASYNC 6 + RTTimeNanoTSLFenceAsync, + +# define RTTIMENANO_WORKER_FALLBACK 7 + rtTimeNanoTSInternalFallback, +}; +/** The index into g_apfnWorkers for the function to use. + * @remarks This cannot be a pointer because that'll break down in RC due to + * code relocation. */ +static uint32_t g_iWorker = RTTIMENANO_WORKER_DETECT; +# else +/** Pointer to the worker */ +static PFNTIMENANOTSINTERNAL g_pfnWorker = rtTimeNanoTSInternalRediscover; +# endif /* IN_RC */ + + +/** + * @interface_method_impl{RTTIMENANOTSDATA,pfnBad} + */ +static DECLCALLBACK(void) rtTimeNanoTSInternalBitch(PRTTIMENANOTSDATA pData, uint64_t u64NanoTS, uint64_t u64DeltaPrev, + uint64_t u64PrevNanoTS) +{ + pData->cBadPrev++; + if ((int64_t)u64DeltaPrev < 0) + LogRel(("TM: u64DeltaPrev=%RI64 u64PrevNanoTS=0x%016RX64 u64NanoTS=0x%016RX64\n", + u64DeltaPrev, u64PrevNanoTS, u64NanoTS)); + else + Log(("TM: u64DeltaPrev=%RI64 u64PrevNanoTS=0x%016RX64 u64NanoTS=0x%016RX64 (debugging?)\n", + u64DeltaPrev, u64PrevNanoTS, u64NanoTS)); +} + +/** + * @interface_method_impl{RTTIMENANOTSDATA,pfnBadCpuIndex} + */ +static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalBadCpuIndex(PRTTIMENANOTSDATA pData, uint16_t idApic, + uint16_t iCpuSet, uint16_t iGipCpu) +{ + RT_NOREF_PV(pData); RT_NOREF_PV(idApic); RT_NOREF_PV(iCpuSet); RT_NOREF_PV(iGipCpu); +# ifndef IN_RC + AssertMsgFailed(("idApic=%#x iCpuSet=%#x iGipCpu=%#x\n", idApic, iCpuSet, iGipCpu)); + return RTTimeSystemNanoTS(); +# else + RTAssertReleasePanic(); + return 0; +# endif +} + + +/** + * Fallback function. + */ +static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalFallback(PRTTIMENANOTSDATA pData) +{ + PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage; + if ( pGip + && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC + && ( pGip->u32Mode == SUPGIPMODE_INVARIANT_TSC + || pGip->u32Mode == SUPGIPMODE_SYNC_TSC + || pGip->u32Mode == SUPGIPMODE_ASYNC_TSC)) + return rtTimeNanoTSInternalRediscover(pData); + NOREF(pData); +# ifndef IN_RC + return RTTimeSystemNanoTS(); +# else + RTAssertReleasePanic(); + return 0; +# endif +} + + +/** + * Called the first time somebody asks for the time or when the GIP + * is mapped/unmapped. + */ +static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalRediscover(PRTTIMENANOTSDATA pData) +{ + PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage; +# ifdef IN_RC + uint32_t iWorker; +# else + PFNTIMENANOTSINTERNAL pfnWorker; +# endif + if ( pGip + && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC + && ( pGip->u32Mode == SUPGIPMODE_INVARIANT_TSC + || pGip->u32Mode == SUPGIPMODE_SYNC_TSC + || pGip->u32Mode == SUPGIPMODE_ASYNC_TSC)) + { + if (ASMCpuId_EDX(1) & X86_CPUID_FEATURE_EDX_SSE2) + { +# ifdef IN_RC + iWorker = pGip->u32Mode == SUPGIPMODE_ASYNC_TSC + ? RTTIMENANO_WORKER_LFENCE_ASYNC + : pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_ROUGHLY_ZERO + ? RTTIMENANO_WORKER_LFENCE_SYNC_INVAR_NO_DELTA + : RTTIMENANO_WORKER_LFENCE_SYNC_INVAR_WITH_DELTA; +# elif defined(IN_RING0) + pfnWorker = pGip->u32Mode == SUPGIPMODE_ASYNC_TSC + ? RTTimeNanoTSLFenceAsync + : pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_ROUGHLY_ZERO + ? RTTimeNanoTSLFenceSyncInvarNoDelta + : RTTimeNanoTSLFenceSyncInvarWithDelta; +# else + if (pGip->u32Mode == SUPGIPMODE_ASYNC_TSC) + pfnWorker = pGip->fGetGipCpu & SUPGIPGETCPU_IDTR_LIMIT_MASK_MAX_SET_CPUS + ? RTTimeNanoTSLFenceAsyncUseIdtrLim + : pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_MASK_MAX_SET_CPUS + ? RTTimeNanoTSLFenceAsyncUseRdtscp + : pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_GROUP_IN_CH_NUMBER_IN_CL + ? RTTimeNanoTSLFenceAsyncUseRdtscpGroupChNumCl + : pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID + ? RTTimeNanoTSLFenceAsyncUseApicId + : rtTimeNanoTSInternalFallback; + else + pfnWorker = pGip->fGetGipCpu & SUPGIPGETCPU_IDTR_LIMIT_MASK_MAX_SET_CPUS + ? pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_PRACTICALLY_ZERO + ? RTTimeNanoTSLFenceSyncInvarNoDelta + : RTTimeNanoTSLFenceSyncInvarWithDeltaUseIdtrLim + : pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_MASK_MAX_SET_CPUS + ? pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_PRACTICALLY_ZERO + ? RTTimeNanoTSLFenceSyncInvarNoDelta + : RTTimeNanoTSLFenceSyncInvarWithDeltaUseRdtscp + : pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID + ? pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_ROUGHLY_ZERO + ? RTTimeNanoTSLFenceSyncInvarNoDelta + : RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicId + : rtTimeNanoTSInternalFallback; +# endif + } + else + { +# ifdef IN_RC + iWorker = pGip->u32Mode == SUPGIPMODE_ASYNC_TSC + ? RTTIMENANO_WORKER_LEGACY_ASYNC + : pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_ROUGHLY_ZERO + ? RTTIMENANO_WORKER_LEGACY_SYNC_INVAR_NO_DELTA : RTTIMENANO_WORKER_LEGACY_SYNC_INVAR_WITH_DELTA; +# elif defined(IN_RING0) + pfnWorker = pGip->u32Mode == SUPGIPMODE_ASYNC_TSC + ? RTTimeNanoTSLegacyAsync + : pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_ROUGHLY_ZERO + ? RTTimeNanoTSLegacySyncInvarNoDelta + : RTTimeNanoTSLegacySyncInvarWithDelta; +# else + if (pGip->u32Mode == SUPGIPMODE_ASYNC_TSC) + pfnWorker = pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_MASK_MAX_SET_CPUS + ? RTTimeNanoTSLegacyAsyncUseRdtscp + : pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_GROUP_IN_CH_NUMBER_IN_CL + ? RTTimeNanoTSLegacyAsyncUseRdtscpGroupChNumCl + : pGip->fGetGipCpu & SUPGIPGETCPU_IDTR_LIMIT_MASK_MAX_SET_CPUS + ? RTTimeNanoTSLegacyAsyncUseIdtrLim + : pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID + ? RTTimeNanoTSLegacyAsyncUseApicId + : rtTimeNanoTSInternalFallback; + else + pfnWorker = pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_MASK_MAX_SET_CPUS + ? pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_PRACTICALLY_ZERO + ? RTTimeNanoTSLegacySyncInvarNoDelta + : RTTimeNanoTSLegacySyncInvarWithDeltaUseRdtscp + : pGip->fGetGipCpu & SUPGIPGETCPU_IDTR_LIMIT_MASK_MAX_SET_CPUS + ? pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_PRACTICALLY_ZERO + ? RTTimeNanoTSLegacySyncInvarNoDelta + : RTTimeNanoTSLegacySyncInvarWithDeltaUseIdtrLim + : pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID + ? pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_ROUGHLY_ZERO + ? RTTimeNanoTSLegacySyncInvarNoDelta + : RTTimeNanoTSLegacySyncInvarWithDeltaUseApicId + : rtTimeNanoTSInternalFallback; +# endif + } + } + else +# ifdef IN_RC + iWorker = RTTIMENANO_WORKER_FALLBACK; +# else + pfnWorker = rtTimeNanoTSInternalFallback; +# endif + +# ifdef IN_RC + ASMAtomicWriteU32((uint32_t volatile *)&g_iWorker, iWorker); + return g_apfnWorkers[iWorker](pData); +# else + ASMAtomicWritePtr((void * volatile *)&g_pfnWorker, (void *)(uintptr_t)pfnWorker); + return pfnWorker(pData); +# endif +} + +#endif /* !IN_GUEST && !RT_NO_GIP */ + + +/** + * Internal worker for getting the current nanosecond timestamp. + */ +DECLINLINE(uint64_t) rtTimeNanoTSInternal(void) +{ +#if !defined(IN_GUEST) && !defined(RT_NO_GIP) +# ifdef IN_RC + return g_apfnWorkers[g_iWorker](&g_TimeNanoTSData); +# else + return g_pfnWorker(&g_TimeNanoTSData); +# endif +#else + return RTTimeSystemNanoTS(); +#endif +} + + +/** + * Gets the current nanosecond timestamp. + * + * @returns nanosecond timestamp. + */ +RTDECL(uint64_t) RTTimeNanoTS(void) +{ + return rtTimeNanoTSInternal(); +} +RT_EXPORT_SYMBOL(RTTimeNanoTS); + + +/** + * Gets the current millisecond timestamp. + * + * @returns millisecond timestamp. + */ +RTDECL(uint64_t) RTTimeMilliTS(void) +{ + return rtTimeNanoTSInternal() / 1000000; +} +RT_EXPORT_SYMBOL(RTTimeMilliTS); + + +#if !defined(IN_GUEST) && !defined(RT_NO_GIP) +/** + * Debugging the time api. + * + * @returns the number of 1ns steps which has been applied by RTTimeNanoTS(). + */ +RTDECL(uint32_t) RTTimeDbgSteps(void) +{ + return g_TimeNanoTSData.c1nsSteps; +} +RT_EXPORT_SYMBOL(RTTimeDbgSteps); + + +/** + * Debugging the time api. + * + * @returns the number of times the TSC interval expired RTTimeNanoTS(). + */ +RTDECL(uint32_t) RTTimeDbgExpired(void) +{ + return g_TimeNanoTSData.cExpired; +} +RT_EXPORT_SYMBOL(RTTimeDbgExpired); + + +/** + * Debugging the time api. + * + * @returns the number of bad previous values encountered by RTTimeNanoTS(). + */ +RTDECL(uint32_t) RTTimeDbgBad(void) +{ + return g_TimeNanoTSData.cBadPrev; +} +RT_EXPORT_SYMBOL(RTTimeDbgBad); + + +/** + * Debugging the time api. + * + * @returns the number of update races in RTTimeNanoTS(). + */ +RTDECL(uint32_t) RTTimeDbgRaces(void) +{ + return g_TimeNanoTSData.cUpdateRaces; +} +RT_EXPORT_SYMBOL(RTTimeDbgRaces); +#endif /* !IN_GUEST && !RT_NO_GIP */ + |