a718743a5c
Newer x86 processors have a core invariant tsc. On these systems it is safe to use the rtdtsc instruction as a monotonic timer. This commit adds a new function to the opal timer code to check if the timer backend is monotonic. On x86 it checks the appropriate bit and on other architectures it parrots back the OPAL_TIMER_MONOTONIC value. Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>
131 строка
4.0 KiB
C
131 строка
4.0 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2014 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 2016 Broadcom Limited. All rights reserved.
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* Copyright (c) 2016 Los Alamos National Security, LLC. All rights
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* reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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/** @file
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*
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* Cycle counter reading instructions. Do not use directly - see the
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* timer interface instead
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*/
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#ifndef OPAL_SYS_TIMER_H
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#define OPAL_SYS_TIMER_H 1
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#include "opal_config.h"
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#include "opal/sys/architecture.h"
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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/* do some quick #define cleanup in cases where we are doing
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testing... */
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#ifdef OPAL_DISABLE_INLINE_ASM
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#undef OPAL_C_GCC_INLINE_ASSEMBLY
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#define OPAL_C_GCC_INLINE_ASSEMBLY 0
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#undef OPAL_CXX_GCC_INLINE_ASSEMBLY
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#define OPAL_CXX_GCC_INLINE_ASSEMBLY 0
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#undef OPAL_C_DEC_INLINE_ASSEMBLY
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#define OPAL_C_DEC_INLINE_ASSEMBLY 0
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#undef OPAL_CXX_DEC_INLINE_ASSEMBLY
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#define OPAL_CXX_DEC_INLINE_ASSEMBLY 0
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#undef OPAL_C_XLC_INLINE_ASSEMBLY
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#define OPAL_C_XLC_INLINE_ASSEMBLY 0
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#undef OPAL_CXX_XLC_INLINE_ASSEMBLY
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#define OPAL_CXX_XLC_INLINE_ASSEMBLY 0
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#endif
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/* define OPAL_{GCC,DEC,XLC}_INLINE_ASSEMBLY based on the
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OPAL_{C,CXX}_{GCC,DEC,XLC}_INLINE_ASSEMBLY defines and whether we
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are in C or C++ */
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#if defined(c_plusplus) || defined(__cplusplus)
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#define OPAL_GCC_INLINE_ASSEMBLY OPAL_CXX_GCC_INLINE_ASSEMBLY
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#define OPAL_DEC_INLINE_ASSEMBLY OPAL_CXX_DEC_INLINE_ASSEMBLY
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#define OPAL_XLC_INLINE_ASSEMBLY OPAL_CXX_XLC_INLINE_ASSEMBLY
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#else
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#define OPAL_GCC_INLINE_ASSEMBLY OPAL_C_GCC_INLINE_ASSEMBLY
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#define OPAL_DEC_INLINE_ASSEMBLY OPAL_C_DEC_INLINE_ASSEMBLY
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#define OPAL_XLC_INLINE_ASSEMBLY OPAL_C_XLC_INLINE_ASSEMBLY
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#endif
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/**********************************************************************
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*
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* Load the appropriate architecture files and set some reasonable
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* default values for our support
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*
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*********************************************************************/
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/* By default we suppose all timers are monotonic per node. */
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#define OPAL_TIMER_MONOTONIC 1
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BEGIN_C_DECLS
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/* If you update this list, you probably also want to update
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opal/mca/timer/linux/configure.m4. Or not. */
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#if defined(DOXYGEN)
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/* don't include system-level gorp when generating doxygen files */
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#elif OPAL_ASSEMBLY_ARCH == OPAL_AMD64
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#include "opal/sys/amd64/timer.h"
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#elif OPAL_ASSEMBLY_ARCH == OPAL_ARM
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#include "opal/sys/arm/timer.h"
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#elif OPAL_ASSEMBLY_ARCH == OPAL_ARM64
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#include "opal/sys/arm64/timer.h"
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#elif OPAL_ASSEMBLY_ARCH == OPAL_IA32
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#include "opal/sys/ia32/timer.h"
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#elif OPAL_ASSEMBLY_ARCH == OPAL_IA64
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#include "opal/sys/ia64/timer.h"
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#elif OPAL_ASSEMBLY_ARCH == OPAL_POWERPC32
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#include "opal/sys/powerpc/timer.h"
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#elif OPAL_ASSEMBLY_ARCH == OPAL_POWERPC64
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#include "opal/sys/powerpc/timer.h"
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#elif OPAL_ASSEMBLY_ARCH == OPAL_SPARCV9_32
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#include "opal/sys/sparcv9/timer.h"
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#elif OPAL_ASSEMBLY_ARCH == OPAL_SPARCV9_64
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#include "opal/sys/sparcv9/timer.h"
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#elif OPAL_ASSEMBLY_ARCH == OPAL_MIPS
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#include "opal/sys/mips/timer.h"
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#endif
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#ifndef DOXYGEN
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#ifndef OPAL_HAVE_SYS_TIMER_GET_CYCLES
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#define OPAL_HAVE_SYS_TIMER_GET_CYCLES 0
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typedef long opal_timer_t;
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#endif
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#endif
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#ifndef OPAL_HAVE_SYS_TIMER_IS_MONOTONIC
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#define OPAL_HAVE_SYS_TIMER_IS_MONOTONIC 1
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static inline bool opal_sys_timer_is_monotonic (void)
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{
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return OPAL_TIMER_MONOTONIC;
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}
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#endif
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END_C_DECLS
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#endif /* OPAL_SYS_TIMER_H */
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