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eal/ppc64: implement arch-specific TSC freq query

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In ppc_64, rte_rdtsc() returns timebase register value which increments
at independent timebase frequency and hence not related to lcore cpu
frequency to derive TSC hz. Hence, we stick with master lcore frequency.

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Signed-off-by: Gowrishankar Muthukrishnan <gowrishankar.m@linux.vnet.ibm.com>
This commit is contained in:
Jerin Jacob 2017-09-22 13:55:34 +05:30 committed by Thomas Monjalon
parent 583152bc81
commit 15692396fd
1 changed files with 46 additions and 1 deletions
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47
lib/librte_eal/common/arch/ppc_64/rte_cycles.c
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@ -1,7 +1,52 @@
/*
* BSD LICENSE
*
* Copyright (C) IBM Corporation 2014.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of IBM Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <rte_lcore.h>
#include <rte_log.h>
#include "eal_filesystem.h"
#include "eal_private.h"
static const char sys_cpu_dir[] = "/sys/devices/system/cpu";
uint64_t
get_tsc_freq_arch(void)
{
return 0;
unsigned long cpu_hz;
char path[PATH_MAX];
snprintf(path, sizeof(path), "%s/cpu%d/cpufreq/cpuinfo_cur_freq",
sys_cpu_dir, rte_get_master_lcore());
if (eal_parse_sysfs_value(path, &cpu_hz) < 0)
RTE_LOG(WARNING, EAL, "Unable to parse %s\n", path);
return cpu_hz*1000;
}