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From: Alexandru Elisei <alexandru.elisei@arm.com>
To: Andre Przywara <andre.przywara@arm.com>,
	Andrew Jones <drjones@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Cc: Marc Zyngier <maz@kernel.org>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Subject: Re: [kvm-unit-tests PATCH 04/17] arm: gic: Support no IRQs test case
Date: Tue, 12 Nov 2019 13:26:17 +0000
Message-ID: <db89b983-425c-8b45-3f26-1a33b9817836@arm.com> (raw)
In-Reply-To: <20191108144240.204202-5-andre.przywara@arm.com>

Hi,

On 11/8/19 2:42 PM, Andre Przywara wrote:
> For some tests it would be important to check that an IRQ was *not*
> triggered, for instance to test certain masking operations.
>
> Extend the check_added() function to recognise an empty cpumask to
> detect this situation. The timeout duration is reduced, and the "no IRQs

Why is the timeout duration reduced?

> triggered" case is actually reported as a success in this case.
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
>  arm/gic.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/arm/gic.c b/arm/gic.c
> index a114009..eca9188 100644
> --- a/arm/gic.c
> +++ b/arm/gic.c
> @@ -66,9 +66,10 @@ static void check_acked(const char *testname, cpumask_t *mask)
>  	int missing = 0, extra = 0, unexpected = 0;
>  	int nr_pass, cpu, i;
>  	bool bad = false;
> +	bool noirqs = cpumask_empty(mask);
>  
>  	/* Wait up to 5s for all interrupts to be delivered */

This comment needs updating.

> -	for (i = 0; i < 50; ++i) {
> +	for (i = 0; i < (noirqs ? 15 : 50); ++i) {
>  		mdelay(100);
>  		nr_pass = 0;
>  		for_each_present_cpu(cpu) {
> @@ -88,7 +89,7 @@ static void check_acked(const char *testname, cpumask_t *mask)
>  				bad = true;
>  			}
>  		}
> -		if (nr_pass == nr_cpus) {
> +		if (!noirqs && nr_pass == nr_cpus) {

This condition is pretty hard to read - what you are doing here is making sure
that when check_acked tests that no irqs have been received, you do the entire for
loop and wait the entire timeout duration. Did I get that right?

How about this (compile tested only):

+               if (noirqs)
+                       /* Wait for the entire timeout duration. */
+                       continue;
+
                if (nr_pass == nr_cpus) {
                        report("%s", !bad, testname);
                        if (i)

>  			report("%s", !bad, testname);
>  			if (i)
>  				report_info("took more than %d ms", i * 100);
> @@ -96,6 +97,11 @@ static void check_acked(const char *testname, cpumask_t *mask)
>  		}
>  	}
>  
> +	if (noirqs && nr_pass == nr_cpus) {
> +		report("%s", !bad, testname);

bad is true only when bad_sender[cpu] != -1 or bad_irq[cpu] != -1, which only get
set in the irq or ipi handlesr, meaning when you do get an interrupt. If nr_pass
== nr_cpus and noirqs, then you shouldn't have gotten an interrupt. I think it's
safe to write it as report("%s", true, testname). I think a short comment above
explaining why we do this check (timeout expired and we haven't gotten any
interrupts) would also improve readability of the code, but that's up to you.

Thanks,
Alex
> +		return;
> +	}
> +
>  	for_each_present_cpu(cpu) {
>  		if (cpumask_test_cpu(cpu, mask)) {
>  			if (!acked[cpu])
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Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 14:42 [kvm-unit-tests PATCH 00/17] arm: gic: Test SPIs and interrupt groups Andre Przywara
2019-11-08 14:42 ` [kvm-unit-tests PATCH 01/17] arm: gic: Enable GIC MMIO tests for GICv3 as well Andre Przywara
2019-11-08 17:28   ` Alexandru Elisei
2019-11-12 12:49   ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 02/17] arm: gic: Generalise function names Andre Przywara
2019-11-12 11:11   ` Alexandru Elisei
2019-11-12 12:49   ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 03/17] arm: gic: Provide per-IRQ helper functions Andre Przywara
2019-11-12 12:51   ` Alexandru Elisei
2019-11-12 15:53     ` Auger Eric
2019-11-12 16:53       ` Alexandru Elisei
2019-11-12 13:49   ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 04/17] arm: gic: Support no IRQs test case Andre Przywara
2019-11-12 13:26   ` Alexandru Elisei [this message]
2019-11-12 21:14     ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 05/17] arm: gic: Prepare IRQ handler for handling SPIs Andre Przywara
2019-11-12 13:36   ` Alexandru Elisei
2019-11-12 20:56   ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 06/17] arm: gic: Add simple shared IRQ test Andre Przywara
2019-11-12 13:54   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 07/17] arm: gic: Extend check_acked() to allow silent call Andre Przywara
2019-11-12 15:23   ` Alexandru Elisei
2019-11-14 12:32     ` Andrew Jones
2019-11-15 11:32       ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 08/17] arm: gic: Add simple SPI MP test Andre Przywara
2019-11-12 15:41   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 09/17] arm: gic: Add test for flipping GICD_CTLR.DS Andre Przywara
2019-11-12 16:42   ` Alexandru Elisei
2019-11-14 13:39     ` Vladimir Murzin
2019-11-14 14:17       ` Andre Przywara
2019-11-14 14:50         ` Vladimir Murzin
2019-11-14 15:21           ` Alexandru Elisei
2019-11-14 15:27             ` Peter Maydell
2019-11-14 15:47               ` Alexandru Elisei
2019-11-14 15:56                 ` Peter Maydell
2019-11-08 14:42 ` [kvm-unit-tests PATCH 10/17] arm: gic: Check for writable IGROUPR registers Andre Przywara
2019-11-12 16:51   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 11/17] arm: gic: Check for validity of both group enable bits Andre Przywara
2019-11-12 16:58   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 12/17] arm: gic: Change gic_read_iar() to take group parameter Andre Przywara
2019-11-12 17:19   ` Alexandru Elisei
2019-11-14 12:50     ` Andrew Jones
2019-11-08 14:42 ` [kvm-unit-tests PATCH 13/17] arm: gic: Change write_eoir() " Andre Przywara
2019-11-08 14:42 ` [kvm-unit-tests PATCH 14/17] arm: gic: Prepare for receiving GIC group 0 interrupts via FIQs Andre Przywara
2019-11-12 17:30   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 15/17] arm: gic: Provide FIQ handler Andre Przywara
2019-11-13 10:14   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 16/17] arm: gic: Prepare interrupt statistics for both groups Andre Przywara
2019-11-13 10:44   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 17/17] arm: gic: Test Group0 SPIs Andre Przywara
2019-11-13 11:26   ` Alexandru Elisei

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