253 строки
7.7 KiB
C
253 строки
7.7 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2004-2007 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) 2004-2016 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) 2015 Research Organization for Information Science
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* and Technology (RIST). All rights reserved.
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* Copyright (c) 2015-2017 Los Alamos National Security, LLC. All rights
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* reserved.
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* Copyright (c) 2015-2017 Cisco Systems, Inc. All rights reserved
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* Copyright (c) 2016 Broadcom Limited. All rights 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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#include "opal_config.h"
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#include <string.h>
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#include "opal/mca/timer/timer.h"
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#include "opal/mca/timer/base/base.h"
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#include "opal/mca/timer/linux/timer_linux.h"
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#include "opal/constants.h"
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#include "opal/util/show_help.h"
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static opal_timer_t opal_timer_linux_get_cycles_sys_timer(void);
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static opal_timer_t opal_timer_linux_get_usec_sys_timer(void);
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/**
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* Define some sane defaults until we call the _init function.
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*/
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#if OPAL_HAVE_CLOCK_GETTIME
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static opal_timer_t opal_timer_linux_get_cycles_clock_gettime(void);
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static opal_timer_t opal_timer_linux_get_usec_clock_gettime(void);
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opal_timer_t (*opal_timer_base_get_cycles)(void) =
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opal_timer_linux_get_cycles_clock_gettime;
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opal_timer_t (*opal_timer_base_get_usec)(void) =
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opal_timer_linux_get_usec_clock_gettime;
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#else
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opal_timer_t (*opal_timer_base_get_cycles)(void) =
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opal_timer_linux_get_cycles_sys_timer;
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opal_timer_t (*opal_timer_base_get_usec)(void) =
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opal_timer_linux_get_usec_sys_timer;
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#endif /* OPAL_HAVE_CLOCK_GETTIME */
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static opal_timer_t opal_timer_linux_freq = {0};
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static int opal_timer_linux_open(void);
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const opal_timer_base_component_2_0_0_t mca_timer_linux_component = {
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/* First, the mca_component_t struct containing meta information
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about the component itself */
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.timerc_version = {
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OPAL_TIMER_BASE_VERSION_2_0_0,
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/* Component name and version */
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.mca_component_name = "linux",
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MCA_BASE_MAKE_VERSION(component, OPAL_MAJOR_VERSION, OPAL_MINOR_VERSION,
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OPAL_RELEASE_VERSION),
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/* Component open and close functions */
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.mca_open_component = opal_timer_linux_open,
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},
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.timerc_data = {
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/* The component is checkpoint ready */
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MCA_BASE_METADATA_PARAM_CHECKPOINT
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},
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};
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static char *
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find_info(FILE* fp, char *str, char *buf, size_t buflen)
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{
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char *tmp;
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rewind(fp);
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while (NULL != fgets(buf, buflen, fp)) {
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if (strncmp(buf, str, strlen(str)) == 0) {
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/* we found the line. Now eat everything up to,
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including, and one past the : */
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for (tmp = buf ; (*tmp != '\0') && (*tmp != ':') ; ++tmp) ;
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if (*tmp == '\0') {
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continue;
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}
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for ( ++tmp ; *tmp == ' ' ; ++tmp);
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if ('\0' != *tmp) {
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return tmp;
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}
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}
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}
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return NULL;
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}
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static int opal_timer_linux_find_freq(void)
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{
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FILE *fp;
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char *loc;
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float cpu_f;
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int ret;
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char buf[1024];
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fp = fopen("/proc/cpuinfo", "r");
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if (NULL == fp) {
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return OPAL_ERR_IN_ERRNO;
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}
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opal_timer_linux_freq = 0;
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#if OPAL_ASSEMBLY_ARCH == OPAL_ARM64
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opal_timer_linux_freq = opal_sys_timer_freq();
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#endif
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if (0 == opal_timer_linux_freq) {
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/* first, look for a timebase field. probably only on PPC,
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but one never knows */
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loc = find_info(fp, "timebase", buf, 1024);
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if (NULL != loc) {
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int freq;
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ret = sscanf(loc, "%d", &freq);
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if (1 == ret) {
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opal_timer_linux_freq = freq;
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}
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}
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}
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#if ((OPAL_ASSEMBLY_ARCH == OPAL_IA32) || (OPAL_ASSEMBLY_ARCH == OPAL_X86_64))
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if (0 == opal_timer_linux_freq && opal_sys_timer_is_monotonic()) {
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/* tsc is exposed through bogomips ~> loops_per_jiffy ~> tsc_khz */
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loc = find_info(fp, "bogomips", buf, 1024);
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if (NULL != loc) {
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ret = sscanf(loc, "%f", &cpu_f);
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if (1 == ret) {
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/* number is in MHz * 2 and has 2 decimal digits
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convert to Hz and make an integer */
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opal_timer_linux_freq = (opal_timer_t) (cpu_f * 100.0f) * 5000;
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}
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}
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}
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#endif
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if (0 == opal_timer_linux_freq) {
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/* find the CPU speed - most timers are 1:1 with CPU speed */
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loc = find_info(fp, "cpu MHz", buf, 1024);
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if (NULL != loc) {
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ret = sscanf(loc, "%f", &cpu_f);
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if (1 == ret) {
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/* numer is in MHz - convert to Hz and make an integer */
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opal_timer_linux_freq = (opal_timer_t) (cpu_f * 1000000);
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}
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}
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}
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if (0 == opal_timer_linux_freq) {
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/* look for the sparc way of getting cpu frequency */
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loc = find_info(fp, "Cpu0ClkTck", buf, 1024);
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if (NULL != loc) {
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unsigned int freq;
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ret = sscanf(loc, "%x", &freq);
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if (1 == ret) {
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opal_timer_linux_freq = freq;
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}
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}
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}
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fclose(fp);
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/* convert the timer frequency to MHz to avoid an extra operation when
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* converting from cycles to usec */
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opal_timer_linux_freq /= 1000000;
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return OPAL_SUCCESS;
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}
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int opal_timer_linux_open(void)
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{
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int ret = OPAL_SUCCESS;
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if (mca_timer_base_monotonic && !opal_sys_timer_is_monotonic ()) {
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#if OPAL_HAVE_CLOCK_GETTIME && (0 == OPAL_TIMER_MONOTONIC)
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struct timespec res;
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if( 0 == clock_getres(CLOCK_MONOTONIC, &res)) {
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opal_timer_linux_freq = 1.e3;
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opal_timer_base_get_cycles = opal_timer_linux_get_cycles_clock_gettime;
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opal_timer_base_get_usec = opal_timer_linux_get_usec_clock_gettime;
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return ret;
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}
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#else
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/* Monotonic time requested but cannot be found. Complain! */
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opal_show_help("help-opal-timer-linux.txt", "monotonic not supported", true);
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#endif /* OPAL_HAVE_CLOCK_GETTIME && (0 == OPAL_TIMER_MONOTONIC) */
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}
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ret = opal_timer_linux_find_freq();
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opal_timer_base_get_cycles = opal_timer_linux_get_cycles_sys_timer;
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opal_timer_base_get_usec = opal_timer_linux_get_usec_sys_timer;
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return ret;
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}
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#if OPAL_HAVE_CLOCK_GETTIME
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opal_timer_t opal_timer_linux_get_usec_clock_gettime(void)
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{
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struct timespec tp = {.tv_sec = 0, .tv_nsec = 0};
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(void) clock_gettime (CLOCK_MONOTONIC, &tp);
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return (tp.tv_sec * 1e6 + tp.tv_nsec/1000);
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}
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opal_timer_t opal_timer_linux_get_cycles_clock_gettime(void)
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{
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struct timespec tp = {.tv_sec = 0, .tv_nsec = 0};
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(void) clock_gettime(CLOCK_MONOTONIC, &tp);
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return (tp.tv_sec * 1e9 + tp.tv_nsec);
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}
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#endif /* OPAL_HAVE_CLOCK_GETTIME */
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opal_timer_t opal_timer_linux_get_cycles_sys_timer(void)
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{
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#if OPAL_HAVE_SYS_TIMER_GET_CYCLES
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return opal_sys_timer_get_cycles();
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#else
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return 0;
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#endif
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}
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opal_timer_t opal_timer_linux_get_usec_sys_timer(void)
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{
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#if OPAL_HAVE_SYS_TIMER_GET_CYCLES
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/* freq is in MHz, so this gives usec */
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return opal_sys_timer_get_cycles() / opal_timer_linux_freq;
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#else
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return 0;
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#endif
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}
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opal_timer_t opal_timer_base_get_freq(void)
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{
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return opal_timer_linux_freq * 1000000;
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}
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