Hi,
On 11/12/19 2:26 PM, Alexandru Elisei wrote:
> 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@xxxxxxx>
>> ---
>> 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);
This one looks at the result of the last iteration (on timeout).
In case of noirqs I think we should be able to return a failure as soon
as an irq is detected where we do not expect it, without waiting for the
full delay?
Thanks
Eric
>
> 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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