[dpdk-dev] [PATCH 3/4] eal/ppc64: implement arch-specific TSC freq query

[Thomas Monjalon <thomas@monjalon.net>]

From: Jerin Jacob <jerin.jacob@caviumnetworks.com>

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>
---
 lib/librte_eal/common/arch/ppc_64/rte_cycles.c | 47 +++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/arch/ppc_64/rte_cycles.c b/lib/librte_eal/common/arch/ppc_64/rte_cycles.c
index 851fd0255..69a9f7475 100644
--- a/lib/librte_eal/common/arch/ppc_64/rte_cycles.c
+++ b/lib/librte_eal/common/arch/ppc_64/rte_cycles.c
@@ -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;
 }
-- 
2.14.1