KVM Archive on lore.kernel.org
 help / color / Atom feed
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 08/10] arm64: microbench: Add vtimer latency test
Date: Fri, 31 Jul 2020 15:42:42 +0800
Message-ID: <20200731074244.20432-9-wangjingyi11@huawei.com> (raw)
In-Reply-To: <20200731074244.20432-1-wangjingyi11@huawei.com>

Trigger PPIs by setting up a 10msec timer and test the latency.

Signed-off-by: Jingyi Wang <wangjingyi11@huawei.com>
---
 arm/micro-bench.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/arm/micro-bench.c b/arm/micro-bench.c
index 09d9d53..1e1bde5 100644
--- a/arm/micro-bench.c
+++ b/arm/micro-bench.c
@@ -21,8 +21,10 @@
 #include <libcflat.h>
 #include <asm/gic.h>
 #include <asm/gic-v3-its.h>
+#include <asm/timer.h>
 
 #define NS_5_SECONDS (5 * 1000 * 1000 * 1000UL)
+
 static u32 cntfrq;
 
 static volatile bool irq_ready, irq_received;
@@ -33,9 +35,16 @@ static void (*write_eoir)(u32 irqstat);
 
 static void gic_irq_handler(struct pt_regs *regs)
 {
+	u32 irqstat = gic_read_iar();
 	irq_ready = false;
 	irq_received = true;
-	gic_write_eoir(gic_read_iar());
+	gic_write_eoir(irqstat);
+
+	if (irqstat == PPI(TIMER_VTIMER_IRQ)) {
+		write_sysreg((ARCH_TIMER_CTL_IMASK | ARCH_TIMER_CTL_ENABLE),
+			     cntv_ctl_el0);
+		isb();
+	}
 	irq_ready = true;
 }
 
@@ -198,6 +207,47 @@ static void lpi_exec(void)
 	assert_msg(irq_received, "failed to receive LPI in time, but received %d successfully\n", received);
 }
 
+static bool timer_prep(void)
+{
+	static void *gic_isenabler;
+
+	gic_enable_defaults();
+	install_irq_handler(EL1H_IRQ, gic_irq_handler);
+	local_irq_enable();
+
+	gic_isenabler = gicv3_sgi_base() + GICR_ISENABLER0;
+	writel(1 << PPI(TIMER_VTIMER_IRQ), gic_isenabler);
+	write_sysreg(ARCH_TIMER_CTL_ENABLE, cntv_ctl_el0);
+	isb();
+
+	gic_prep_common();
+	return true;
+}
+
+static void timer_exec(void)
+{
+	u64 before_timer;
+	u64 timer_10ms;
+	unsigned tries = 1 << 28;
+	static int received = 0;
+
+	irq_received = false;
+
+	before_timer = read_sysreg(cntvct_el0);
+	timer_10ms = cntfrq / 100;
+	write_sysreg(before_timer + timer_10ms, cntv_cval_el0);
+	write_sysreg(ARCH_TIMER_CTL_ENABLE, cntv_ctl_el0);
+	isb();
+
+	while (!irq_received && tries--)
+		cpu_relax();
+
+	if (irq_received)
+		++received;
+
+	assert_msg(irq_received, "failed to receive PPI in time, but received %d successfully\n", received);
+}
+
 static void hvc_exec(void)
 {
 	asm volatile("mov w0, #0x4b000000; hvc #0" ::: "w0");
@@ -245,6 +295,7 @@ static struct exit_test tests[] = {
 	{"ipi",			ipi_prep,	ipi_exec,		65536,		true},
 	{"ipi_hw",		ipi_hw_prep,	ipi_exec,		65536,		true},
 	{"lpi",			lpi_prep,	lpi_exec,		65536,		true},
+	{"timer_10ms",		timer_prep,	timer_exec,		256,		true},
 };
 
 struct ns_time {
-- 
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 " 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 ` Jingyi Wang [this message]
2020-08-01 16:22   ` [kvm-unit-tests PATCH v3 08/10] arm64: microbench: Add vtimer latency test 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 ` [kvm-unit-tests PATCH v3 10/10] arm64: microbench: Add timer_post() to get actual PPI latency Jingyi Wang
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

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=20200731074244.20432-9-wangjingyi11@huawei.com \
    --to=wangjingyi11@huawei.com \
    --cc=drjones@redhat.com \
    --cc=eric.auger@redhat.com \
    --cc=kvm@vger.kernel.org \
    --cc=kvmarm@lists.cs.columbia.edu \
    --cc=maz@kernel.org \
    --cc=prime.zeng@hisilicon.com \
    --cc=wanghaibin.wang@huawei.com \
    --cc=yuzenghui@huawei.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

KVM Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/kvm/0 kvm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 kvm kvm/ https://lore.kernel.org/kvm \
		kvm@vger.kernel.org
	public-inbox-index kvm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.kvm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git