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From: Jingyi Wang <wangjingyi11@huawei.com>
To: <drjones@redhat.com>, <kvm@vger.kernel.org>,
	<kvmarm@lists.cs.columbia.edu>
Cc: <maz@kernel.org>, <wanghaibin.wang@huawei.com>,
	<yuzenghui@huawei.com>, <eric.auger@redhat.com>,
	<wangjingyi11@huawei.com>, <prime.zeng@hisilicon.com>
Subject: [kvm-unit-tests PATCH v3 10/10] arm64: microbench: Add timer_post() to get actual PPI latency
Date: Fri, 31 Jul 2020 15:42:44 +0800
Message-ID: <20200731074244.20432-11-wangjingyi11@huawei.com> (raw)
In-Reply-To: <20200731074244.20432-1-wangjingyi11@huawei.com>

For we get the time duration of (10msec timer + injection latency)
in timer_exec(), we substract the value of 10msec in timer_post()
to get the actual latency.

Signed-off-by: Jingyi Wang <wangjingyi11@huawei.com>
---
 arm/micro-bench.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/arm/micro-bench.c b/arm/micro-bench.c
index 4680ba4..315fc7c 100644
--- a/arm/micro-bench.c
+++ b/arm/micro-bench.c
@@ -254,6 +254,18 @@ static void timer_exec(void)
 	assert_msg(irq_received, "failed to receive PPI in time, but received %d successfully\n", received);
 }
 
+static void timer_post(uint64_t total_ticks, uint64_t ntimes, struct ns_time *total_ns)
+{
+	/*
+	 * We use a 10msec timer to test the latency of PPI,
+	 * so we substract the ticks of 10msec to get the
+	 * actual latency
+	 */
+
+	total_ticks -= ntimes * (cntfrq / 100);
+	ticks_to_ns_time(total_ticks, total_ns);
+}
+
 static void hvc_exec(void)
 {
 	asm volatile("mov w0, #0x4b000000; hvc #0" ::: "w0");
@@ -302,7 +314,7 @@ static struct exit_test tests[] = {
 	{"ipi",			ipi_prep,	ipi_exec,		NULL,		65536,		true},
 	{"ipi_hw",		ipi_hw_prep,	ipi_exec,		NULL,		65536,		true},
 	{"lpi",			lpi_prep,	lpi_exec,		NULL,		65536,		true},
-	{"timer_10ms",		timer_prep,	timer_exec,		NULL,		256,		true},
+	{"timer_10ms",		timer_prep,	timer_exec,		timer_post,	256,		true},
 };
 
 #define PS_PER_SEC (1000 * 1000 * 1000 * 1000UL)
-- 
2.19.1



  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-31  7:42 [kvm-unit-tests PATCH v3 00/10] arm/arm64: Add IPI/LPI/vtimer latency test Jingyi Wang
2020-07-31  7:42 ` [kvm-unit-tests PATCH v3 01/10] arm64: microbench: get correct ipi received num Jingyi Wang
2020-07-31  7:42 ` [kvm-unit-tests PATCH v3 02/10] arm64: microbench: Generalize ipi test names Jingyi Wang
2020-07-31  7:42 ` [kvm-unit-tests PATCH v3 03/10] arm64: microbench: gic: Add ipi latency test for gicv4.1 support kvm Jingyi Wang
2020-07-31  7:42 ` [kvm-unit-tests PATCH v3 04/10] arm64: its: Handle its command queue wrapping Jingyi Wang
2020-07-31  7:42 ` [kvm-unit-tests PATCH v3 05/10] arm64: microbench: its: Add LPI latency test Jingyi Wang
2020-07-31  7:42 ` [kvm-unit-tests PATCH v3 06/10] arm64: microbench: Allow each test to specify its running times Jingyi Wang
2020-07-31  7:42 ` [kvm-unit-tests PATCH v3 07/10] arm64: microbench: Add time limit for each individual test Jingyi Wang
2020-08-01 16:13   ` Andrew Jones
2020-07-31  7:42 ` [kvm-unit-tests PATCH v3 08/10] arm64: microbench: Add vtimer latency test Jingyi Wang
2020-08-01 16:22   ` Andrew Jones
2020-07-31  7:42 ` [kvm-unit-tests PATCH v3 09/10] arm64: microbench: Add test->post() to further process test results Jingyi Wang
2020-08-01 17:03   ` Andrew Jones
2020-07-31  7:42 ` Jingyi Wang [this message]
2020-07-31 12:01 ` [kvm-unit-tests PATCH v3 00/10] arm/arm64: Add IPI/LPI/vtimer latency test Andrew Jones
2020-08-03  2:15   ` Jingyi Wang
2020-08-01 17:40 ` Andrew Jones
2020-08-05 11:54 ` Jingyi Wang
2020-08-05 12:13   ` Marc Zyngier
2020-08-11  1:48     ` Jingyi Wang
2020-08-11  7:49       ` Marc Zyngier
2020-08-17  1:46         ` Jingyi Wang
2020-08-17  8:26           ` Marc Zyngier

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