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/* $Id: timesup.cpp $ */
/** @file
* IPRT - Time using SUPLib.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* 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, PRTITMENANOTSEXTRA pExtra);
static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalRediscover(PRTTIMENANOTSDATA pData, PRTITMENANOTSEXTRA pExtra);
static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalBadCpuIndex(PRTTIMENANOTSDATA pData, PRTITMENANOTSEXTRA pExtra,
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, PRTITMENANOTSEXTRA pExtra,
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));
if (pExtra)
pExtra->uTSCValue = ASMReadTSC();
return RTTimeSystemNanoTS();
# else
RTAssertReleasePanic();
return 0;
# endif
}
/**
* Fallback function.
*/
static DECLCALLBACK(uint64_t) rtTimeNanoTSInternalFallback(PRTTIMENANOTSDATA pData, PRTITMENANOTSEXTRA pExtra)
{
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, pExtra);
NOREF(pData);
# ifndef IN_RC
if (pExtra)
pExtra->uTSCValue = ASMReadTSC();
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, PRTITMENANOTSEXTRA pExtra)
{
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)
{
if ( pGip->fGetGipCpu & SUPGIPGETCPU_IDTR_LIMIT_MASK_MAX_SET_CPUS)
pfnWorker = RTTimeNanoTSLFenceAsyncUseIdtrLim;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_MASK_MAX_SET_CPUS)
pfnWorker = RTTimeNanoTSLFenceAsyncUseRdtscp;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_GROUP_IN_CH_NUMBER_IN_CL)
pfnWorker = RTTimeNanoTSLFenceAsyncUseRdtscpGroupChNumCl;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID_EXT_0B)
pfnWorker = RTTimeNanoTSLFenceAsyncUseApicIdExt0B;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID_EXT_8000001E)
pfnWorker = RTTimeNanoTSLFenceAsyncUseApicIdExt8000001E;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID)
pfnWorker = RTTimeNanoTSLFenceAsyncUseApicId;
else
pfnWorker = rtTimeNanoTSInternalFallback;
}
else
{
if (pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_PRACTICALLY_ZERO)
pfnWorker = RTTimeNanoTSLFenceSyncInvarNoDelta;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_IDTR_LIMIT_MASK_MAX_SET_CPUS)
pfnWorker = RTTimeNanoTSLFenceSyncInvarWithDeltaUseIdtrLim;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_MASK_MAX_SET_CPUS)
pfnWorker = RTTimeNanoTSLFenceSyncInvarWithDeltaUseRdtscp;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID_EXT_0B)
pfnWorker = RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicIdExt0B;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID_EXT_8000001E)
pfnWorker = RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicIdExt8000001E;
else if (pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID)
pfnWorker = RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicId;
else
pfnWorker = 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_EXT_0B
? RTTimeNanoTSLegacyAsyncUseApicIdExt0B
: pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID_EXT_8000001E
? RTTimeNanoTSLegacyAsyncUseApicIdExt8000001E
: 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_EXT_0B
? pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_ROUGHLY_ZERO
? RTTimeNanoTSLegacySyncInvarNoDelta
: RTTimeNanoTSLegacySyncInvarWithDeltaUseApicIdExt0B
: pGip->fGetGipCpu & SUPGIPGETCPU_APIC_ID_EXT_8000001E
? pGip->enmUseTscDelta <= SUPGIPUSETSCDELTA_ROUGHLY_ZERO
? RTTimeNanoTSLegacySyncInvarNoDelta
: RTTimeNanoTSLegacySyncInvarWithDeltaUseApicIdExt8000001E
: 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, pExtra);
# else
ASMAtomicWritePtr((void * volatile *)&g_pfnWorker, (void *)(uintptr_t)pfnWorker);
return pfnWorker(pData, pExtra);
# endif
}
# if defined(IN_RING3) || defined(IN_RING0)
RTDECL(const char *) RTTimeNanoTSWorkerName(void)
{
static const struct { PFNTIMENANOTSINTERNAL pfnWorker; const char *pszName; } s_aWorkersAndNames[] =
{
# define ENTRY(a_fn) { a_fn, #a_fn }
ENTRY(RTTimeNanoTSLegacySyncInvarNoDelta),
ENTRY(RTTimeNanoTSLFenceSyncInvarNoDelta),
# ifdef IN_RING3
ENTRY(RTTimeNanoTSLegacyAsyncUseApicId),
ENTRY(RTTimeNanoTSLegacyAsyncUseApicIdExt0B),
ENTRY(RTTimeNanoTSLegacyAsyncUseApicIdExt8000001E),
ENTRY(RTTimeNanoTSLegacyAsyncUseRdtscp),
ENTRY(RTTimeNanoTSLegacyAsyncUseRdtscpGroupChNumCl),
ENTRY(RTTimeNanoTSLegacyAsyncUseIdtrLim),
ENTRY(RTTimeNanoTSLegacySyncInvarWithDeltaUseApicId),
ENTRY(RTTimeNanoTSLegacySyncInvarWithDeltaUseApicIdExt0B),
ENTRY(RTTimeNanoTSLegacySyncInvarWithDeltaUseApicIdExt8000001E),
ENTRY(RTTimeNanoTSLegacySyncInvarWithDeltaUseRdtscp),
ENTRY(RTTimeNanoTSLegacySyncInvarWithDeltaUseIdtrLim),
ENTRY(RTTimeNanoTSLFenceAsyncUseApicId),
ENTRY(RTTimeNanoTSLFenceAsyncUseApicIdExt0B),
ENTRY(RTTimeNanoTSLFenceAsyncUseApicIdExt8000001E),
ENTRY(RTTimeNanoTSLFenceAsyncUseRdtscp),
ENTRY(RTTimeNanoTSLFenceAsyncUseRdtscpGroupChNumCl),
ENTRY(RTTimeNanoTSLFenceAsyncUseIdtrLim),
ENTRY(RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicId),
ENTRY(RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicIdExt0B),
ENTRY(RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicIdExt8000001E),
ENTRY(RTTimeNanoTSLFenceSyncInvarWithDeltaUseRdtscp),
ENTRY(RTTimeNanoTSLFenceSyncInvarWithDeltaUseIdtrLim),
# else
ENTRY(RTTimeNanoTSLegacyAsync),
ENTRY(RTTimeNanoTSLegacySyncInvarWithDelta),
ENTRY(RTTimeNanoTSLFenceAsync),
ENTRY(RTTimeNanoTSLFenceSyncInvarWithDelta),
# endif
ENTRY(rtTimeNanoTSInternalFallback),
# undef ENTRY
};
PFNTIMENANOTSINTERNAL pfnWorker = g_pfnWorker;
if (pfnWorker == rtTimeNanoTSInternalRediscover)
{
RTTimeNanoTS();
pfnWorker = g_pfnWorker;
}
for (unsigned i = 0; i < RT_ELEMENTS(s_aWorkersAndNames); i++)
if (s_aWorkersAndNames[i].pfnWorker == pfnWorker)
return s_aWorkersAndNames[i].pszName;
AssertFailed();
return NULL;
}
# endif /* IN_RING3 || IN_RING0 */
#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, NULL /*pExtra*/);
# else
return g_pfnWorker(&g_TimeNanoTSData, NULL /*pExtra*/);
# 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 */
|
