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|
/* $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 */
|
