From: Thomas Monjalon <thomas@monjalon.net>
To: gowrishankar.m@linux.vnet.ibm.com,
jerin.jacob@caviumnetworks.com, jianbo.liu@linaro.org,
sergio.gonzalez.monroy@intel.com, bruce.richardson@intel.com
Cc: dev@dpdk.org
Subject: [dpdk-dev] [PATCH 2/4] eal/armv8: implement arch-specific TSC freq query
Date: Fri, 13 Oct 2017 02:02:45 +0200 [thread overview]
Message-ID: <20171013000247.4158-3-thomas@monjalon.net> (raw)
In-Reply-To: <20171013000247.4158-1-thomas@monjalon.net>
From: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Use cntvct_el0 system register to get the system counter frequency.
If the system is configured with RTE_ARM_EAL_RDTSC_USE_PMU then
return 0(let the common code calibrate the tsc frequency).
Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: Jianbo Liu <jianbo.liu@linaro.org>
---
lib/librte_eal/common/arch/arm/rte_cycles.c | 38 +++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/lib/librte_eal/common/arch/arm/rte_cycles.c b/lib/librte_eal/common/arch/arm/rte_cycles.c
index 851fd0255..3e31e5be1 100644
--- a/lib/librte_eal/common/arch/arm/rte_cycles.c
+++ b/lib/librte_eal/common/arch/arm/rte_cycles.c
@@ -1,7 +1,45 @@
+/*
+ * BSD LICENSE
+ *
+ * Copyright (C) Cavium, Inc. 2015.
+ *
+ * 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 Cavium, Inc 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 "eal_private.h"
uint64_t
get_tsc_freq_arch(void)
{
+#if defined RTE_ARCH_ARM64 && !defined RTE_ARM_EAL_RDTSC_USE_PMU
+ uint64_t freq;
+ asm volatile("mrs %0, cntfrq_el0" : "=r" (freq));
+ return freq;
+#else
return 0;
+#endif
}
--
2.14.1
next prev parent reply other threads:[~2017-10-13 0:02 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-22 8:25 [dpdk-dev] [PATCH v2 0/5] improve tsc frequency calibration Gowrishankar
2017-09-22 8:25 ` [dpdk-dev] [PATCH v2 1/5] eal/x86: define architecture specific rdtsc hz Gowrishankar
2017-09-22 8:25 ` [dpdk-dev] [PATCH v2 2/5] eal/ppc64: " Gowrishankar
2017-10-12 22:20 ` Thomas Monjalon
2017-09-22 8:25 ` [dpdk-dev] [PATCH v2 3/5] eal/armv7: " Gowrishankar
2017-09-22 8:25 ` [dpdk-dev] [PATCH v2 4/5] eal/armv8: " Gowrishankar
2017-09-22 8:25 ` [dpdk-dev] [PATCH v2 5/5] eal/timer: honor architecture specific rdtsc hz function Gowrishankar
2017-10-11 17:36 ` Thomas Monjalon
2017-10-11 18:57 ` Jerin Jacob
2017-10-11 19:25 ` Thomas Monjalon
2017-10-12 8:48 ` Bruce Richardson
2017-10-12 10:12 ` Thomas Monjalon
2017-10-12 10:25 ` Bruce Richardson
2017-10-12 10:16 ` Jerin Jacob
2017-10-13 0:02 ` [dpdk-dev] [PATCH 0/4] improve tsc frequency calibration Thomas Monjalon
2017-10-13 0:02 ` [dpdk-dev] [PATCH 1/4] timer: honor arch-specific TSC frequency query Thomas Monjalon
2017-10-13 0:02 ` Thomas Monjalon [this message]
2017-10-13 0:02 ` [dpdk-dev] [PATCH 3/4] eal/ppc64: implement arch-specific TSC freq query Thomas Monjalon
2017-10-13 0:02 ` [dpdk-dev] [PATCH 4/4] eal/x86: " Thomas Monjalon
2017-10-13 3:47 ` Stephen Hemminger
2017-10-13 7:30 ` Thomas Monjalon
2017-10-13 15:13 ` Stephen Hemminger
2017-10-13 15:17 ` Bruce Richardson
2017-10-13 3:21 ` [dpdk-dev] [PATCH 0/4] improve tsc frequency calibration Jerin Jacob
2017-10-13 11:08 ` Thomas Monjalon
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171013000247.4158-3-thomas@monjalon.net \
--to=thomas@monjalon.net \
--cc=bruce.richardson@intel.com \
--cc=dev@dpdk.org \
--cc=gowrishankar.m@linux.vnet.ibm.com \
--cc=jerin.jacob@caviumnetworks.com \
--cc=jianbo.liu@linaro.org \
--cc=sergio.gonzalez.monroy@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).