/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2016 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2015-2017 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2015-2017 Cisco Systems, Inc. All rights reserved
* Copyright (c) 2016 Broadcom Limited. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include <string.h>
#include "opal/mca/timer/timer.h"
#include "opal/mca/timer/base/base.h"
#include "opal/mca/timer/linux/timer_linux.h"
#include "opal/constants.h"
#include "opal/util/show_help.h"
static opal_timer_t opal_timer_linux_get_cycles_sys_timer(void);
static opal_timer_t opal_timer_linux_get_usec_sys_timer(void);
/**
* Define some sane defaults until we call the _init function.
*/
#if OPAL_HAVE_CLOCK_GETTIME
static opal_timer_t opal_timer_linux_get_cycles_clock_gettime(void);
static opal_timer_t opal_timer_linux_get_usec_clock_gettime(void);
opal_timer_t (*opal_timer_base_get_cycles)(void) =
opal_timer_linux_get_cycles_clock_gettime;
opal_timer_t (*opal_timer_base_get_usec)(void) =
opal_timer_linux_get_usec_clock_gettime;
#else
opal_timer_t (*opal_timer_base_get_cycles)(void) =
opal_timer_linux_get_cycles_sys_timer;
opal_timer_t (*opal_timer_base_get_usec)(void) =
opal_timer_linux_get_usec_sys_timer;
#endif /* OPAL_HAVE_CLOCK_GETTIME */
static opal_timer_t opal_timer_linux_freq = {0};
static int opal_timer_linux_open(void);
const opal_timer_base_component_2_0_0_t mca_timer_linux_component = {
/* First, the mca_component_t struct containing meta information
about the component itself */
.timerc_version = {
OPAL_TIMER_BASE_VERSION_2_0_0,
/* Component name and version */
.mca_component_name = "linux",
MCA_BASE_MAKE_VERSION(component, OPAL_MAJOR_VERSION, OPAL_MINOR_VERSION,
OPAL_RELEASE_VERSION),
/* Component open and close functions */
.mca_open_component = opal_timer_linux_open,
},
.timerc_data = {
/* The component is checkpoint ready */
MCA_BASE_METADATA_PARAM_CHECKPOINT
},
};
static char *
find_info(FILE* fp, char *str, char *buf, size_t buflen)
{
char *tmp;
rewind(fp);
while (NULL != fgets(buf, buflen, fp)) {
if (strncmp(buf, str, strlen(str)) == 0) {
/* we found the line. Now eat everything up to,
including, and one past the : */
for (tmp = buf ; (*tmp != '\0') && (*tmp != ':') ; ++tmp) ;
if (*tmp == '\0') {
continue;
}
for ( ++tmp ; *tmp == ' ' ; ++tmp);
if ('\0' != *tmp) {
return tmp;
}
}
}
return NULL;
}
static int opal_timer_linux_find_freq(void)
{
FILE *fp;
char *loc;
float cpu_f;
int ret;
char buf[1024];
fp = fopen("/proc/cpuinfo", "r");
if (NULL == fp) {
return OPAL_ERR_IN_ERRNO;
}
opal_timer_linux_freq = 0;
#if OPAL_ASSEMBLY_ARCH == OPAL_ARM64
opal_timer_linux_freq = opal_sys_timer_freq();
#endif
if (0 == opal_timer_linux_freq) {
/* first, look for a timebase field. probably only on PPC,
but one never knows */
loc = find_info(fp, "timebase", buf, 1024);
if (NULL != loc) {
int freq;
ret = sscanf(loc, "%d", &freq);
if (1 == ret) {
opal_timer_linux_freq = freq;
}
}
}
#if ((OPAL_ASSEMBLY_ARCH == OPAL_IA32) || (OPAL_ASSEMBLY_ARCH == OPAL_X86_64))
if (0 == opal_timer_linux_freq && opal_sys_timer_is_monotonic()) {
/* tsc is exposed through bogomips ~> loops_per_jiffy ~> tsc_khz */
loc = find_info(fp, "bogomips", buf, 1024);
if (NULL != loc) {
ret = sscanf(loc, "%f", &cpu_f);
if (1 == ret) {
/* number is in MHz * 2 and has 2 decimal digits
convert to Hz and make an integer */
opal_timer_linux_freq = (opal_timer_t) (cpu_f * 100.0f) * 5000;
}
}
}
#endif
if (0 == opal_timer_linux_freq) {
/* find the CPU speed - most timers are 1:1 with CPU speed */
loc = find_info(fp, "cpu MHz", buf, 1024);
if (NULL != loc) {
ret = sscanf(loc, "%f", &cpu_f);
if (1 == ret) {
/* numer is in MHz - convert to Hz and make an integer */
opal_timer_linux_freq = (opal_timer_t) (cpu_f * 1000000);
}
}
}
if (0 == opal_timer_linux_freq) {
/* look for the sparc way of getting cpu frequency */
loc = find_info(fp, "Cpu0ClkTck", buf, 1024);
if (NULL != loc) {
unsigned int freq;
ret = sscanf(loc, "%x", &freq);
if (1 == ret) {
opal_timer_linux_freq = freq;
}
}
}
fclose(fp);
/* convert the timer frequency to MHz to avoid an extra operation when
* converting from cycles to usec */
opal_timer_linux_freq /= 1000000;
return OPAL_SUCCESS;
}
int opal_timer_linux_open(void)
{
int ret = OPAL_SUCCESS;
if (mca_timer_base_monotonic && !opal_sys_timer_is_monotonic ()) {
#if OPAL_HAVE_CLOCK_GETTIME && (0 == OPAL_TIMER_MONOTONIC)
struct timespec res;
if( 0 == clock_getres(CLOCK_MONOTONIC, &res)) {
opal_timer_linux_freq = 1.e3;
opal_timer_base_get_cycles = opal_timer_linux_get_cycles_clock_gettime;
opal_timer_base_get_usec = opal_timer_linux_get_usec_clock_gettime;
return ret;
}
#else
/* Monotonic time requested but cannot be found. Complain! */
opal_show_help("help-opal-timer-linux.txt", "monotonic not supported", true);
#endif /* OPAL_HAVE_CLOCK_GETTIME && (0 == OPAL_TIMER_MONOTONIC) */
}
ret = opal_timer_linux_find_freq();
opal_timer_base_get_cycles = opal_timer_linux_get_cycles_sys_timer;
opal_timer_base_get_usec = opal_timer_linux_get_usec_sys_timer;
return ret;
}
#if OPAL_HAVE_CLOCK_GETTIME
opal_timer_t opal_timer_linux_get_usec_clock_gettime(void)
{
struct timespec tp = {.tv_sec = 0, .tv_nsec = 0};
(void) clock_gettime (CLOCK_MONOTONIC, &tp);
return (tp.tv_sec * 1e6 + tp.tv_nsec/1000);
}
opal_timer_t opal_timer_linux_get_cycles_clock_gettime(void)
{
struct timespec tp = {.tv_sec = 0, .tv_nsec = 0};
(void) clock_gettime(CLOCK_MONOTONIC, &tp);
return (tp.tv_sec * 1e9 + tp.tv_nsec);
}
#endif /* OPAL_HAVE_CLOCK_GETTIME */
opal_timer_t opal_timer_linux_get_cycles_sys_timer(void)
{
#if OPAL_HAVE_SYS_TIMER_GET_CYCLES
return opal_sys_timer_get_cycles();
#else
return 0;
#endif
}
opal_timer_t opal_timer_linux_get_usec_sys_timer(void)
{
#if OPAL_HAVE_SYS_TIMER_GET_CYCLES
/* freq is in MHz, so this gives usec */
return opal_sys_timer_get_cycles() / opal_timer_linux_freq;
#else
return 0;
#endif
}
opal_timer_t opal_timer_base_get_freq(void)
{
return opal_timer_linux_freq * 1000000;
}