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From: Auger Eric <eric.auger@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: kvm-devel <kvm@vger.kernel.org>, Marc Zyngier <maz@kernel.org>,
	QEMU Developers <qemu-devel@nongnu.org>,
	qemu-arm <qemu-arm@nongnu.org>,
	Andre Przywara <andre.przywara@arm.com>,
	Andrew Murray <andrew.murray@arm.com>,
	kvmarm@lists.cs.columbia.edu,
	Eric Auger <eric.auger.pro@gmail.com>
Subject: Re: [kvm-unit-tests PATCH v2 4/9] arm: pmu: Check Required Event Support
Date: Tue, 11 Feb 2020 19:08:59 +0100
Message-ID: <45a29624-764f-acb2-dcc8-294bc591032e@redhat.com> (raw)
In-Reply-To: <CAFEAcA9rsncts+s4tVn4tY4zaMHKeqyJj1O4J=Ufx33fb=Nrcg@mail.gmail.com>

Hi Peter,

On 2/11/20 4:33 PM, Peter Maydell wrote:
> On Thu, 30 Jan 2020 at 11:25, Eric Auger <eric.auger@redhat.com> wrote:
>>
>> If event counters are implemented check the common events
>> required by the PMUv3 are implemented.
>>
>> Some are unconditionally required (SW_INCR, CPU_CYCLES,
>> either INST_RETIRED or INST_SPEC). Some others only are
>> required if the implementation implements some other features.
>>
>> Check those wich are unconditionally required.
>>
>> This test currently fails on TCG as neither INST_RETIRED
>> or INST_SPEC are supported.
>>
>> Signed-off-by: Eric Auger <eric.auger@redhat.com>
>>
>> ---
>>
> 
>> +static bool is_event_supported(uint32_t n, bool warn)
>> +{
>> +       uint64_t pmceid0 = read_sysreg(pmceid0_el0);
>> +       uint64_t pmceid1 = read_sysreg_s(PMCEID1_EL0);
>> +       bool supported;
>> +       uint64_t reg;
>> +
>> +       /*
>> +        * The low 32-bits of PMCEID0/1 respectly describe
> 
> "respectively"
> 
>> +        * event support for events 0-31/32-63. Their High
>> +        * 32-bits describe support for extended events
>> +        * starting at 0x4000, using the same split.
>> +        */
>> +       if (n >= 0x0  && n <= 0x3F)
>> +               reg = (pmceid0 & 0xFFFFFFFF) | ((pmceid1 & 0xFFFFFFFF) << 32);
>> +       else if  (n >= 0x4000 && n <= 0x403F)
>> +               reg = (pmceid0 >> 32) | ((pmceid1 >> 32) << 32);
>> +       else
>> +               abort();
>> +
>> +       supported =  reg & (1UL << (n & 0x3F));
>> +
>> +       if (!supported && warn)
>> +               report_info("event %d is not supported", n);
>> +       return supported;
>> +}
>> +
>> +static void test_event_introspection(void)
>> +{
>> +       bool required_events;
>> +
>> +       if (!pmu.nb_implemented_counters) {
>> +               report_skip("No event counter, skip ...");
>> +               return;
>> +       }
>> +
>> +       /* PMUv3 requires an implementation includes some common events */
>> +       required_events = is_event_supported(0x0, true) /* SW_INCR */ &&
>> +                         is_event_supported(0x11, true) /* CPU_CYCLES */ &&
>> +                         (is_event_supported(0x8, true) /* INST_RETIRED */ ||
>> +                          is_event_supported(0x1B, true) /* INST_PREC */);
>> +
>> +       if (pmu.version == 0x4) {
> 
> This condition will only test for v8.1-required events if the PMU
> is exactly 8.1, so you lose coverage if the implementation happens
> to support ARMv8.4-PMU. Hopefully you have already bailed out
> for "ID_AA64DFR0_EL1.PMUVer == 0xf" which means "non-standard IMPDEF
> PMU", in which case you can just check >= 0x4.
OK thanks

Eric
> 
>> +               /* ARMv8.1 PMU: STALL_FRONTEND and STALL_BACKEND are required */
>> +               required_events = required_events &&
>> +                                 is_event_supported(0x23, true) &&
>> +                                 is_event_supported(0x24, true);
>> +       }
>> +
>> +       report(required_events, "Check required events are implemented");
>> +}
>> +
>>  #endif
> 
> thanks
> -- PMM
> 

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Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-30 11:25 [kvm-unit-tests PATCH v2 0/9] KVM: arm64: PMUv3 Event Counter Tests Eric Auger
2020-01-30 11:25 ` [kvm-unit-tests PATCH v2 1/9] arm64: Provide read/write_sysreg_s Eric Auger
2020-01-30 11:25 ` [kvm-unit-tests PATCH v2 2/9] arm: pmu: Let pmu tests take a sub-test parameter Eric Auger
2020-03-04 18:01   ` Andre Przywara
2020-03-05  8:44   ` Andrew Jones
2020-01-30 11:25 ` [kvm-unit-tests PATCH v2 3/9] arm: pmu: Add a pmu struct Eric Auger
2020-03-04 18:02   ` Andre Przywara
2020-03-04 18:21     ` Auger Eric
2020-03-05  8:53   ` Andrew Jones
2020-01-30 11:25 ` [kvm-unit-tests PATCH v2 4/9] arm: pmu: Check Required Event Support Eric Auger
2020-02-11 15:33   ` Peter Maydell
2020-02-11 18:08     ` Auger Eric [this message]
2020-02-11 16:28   ` Peter Maydell
2020-02-11 18:32     ` Auger Eric
2020-03-04 18:02   ` Andre Przywara
2020-03-05  9:04   ` Andrew Jones
2020-01-30 11:25 ` [kvm-unit-tests PATCH v2 5/9] arm: pmu: Basic event counter Tests Eric Auger
2020-02-11 16:27   ` Peter Maydell
2020-02-11 18:31     ` Auger Eric
2020-03-04 18:03   ` Andre Przywara
2020-03-05  9:33   ` Andrew Jones
2020-03-12 11:19     ` Auger Eric
2020-03-05  9:42   ` Andrew Jones
2020-03-12 11:16     ` Auger Eric
2020-01-30 11:25 ` [kvm-unit-tests PATCH v2 6/9] arm: pmu: Test chained counter Eric Auger
2020-02-11 16:24   ` Peter Maydell
2020-02-11 18:30     ` Auger Eric
2020-03-05  9:37   ` Andrew Jones
2020-01-30 11:25 ` [kvm-unit-tests PATCH v2 7/9] arm: pmu: test 32-bit <-> 64-bit transitions Eric Auger
2020-03-05  9:50   ` Andrew Jones
2020-01-30 11:25 ` [kvm-unit-tests PATCH v2 8/9] arm: gic: Provide per-IRQ helper functions Eric Auger
2020-03-05  9:55   ` Andrew Jones
2020-03-05 11:10     ` Alexandru Elisei
2020-01-30 11:25 ` [kvm-unit-tests PATCH v2 9/9] arm: pmu: Test overflow interrupts Eric Auger
2020-03-05 10:17   ` Andrew Jones
2020-02-11 15:42 ` [kvm-unit-tests PATCH v2 0/9] KVM: arm64: PMUv3 Event Counter Tests Peter Maydell
2020-02-11 16:07   ` Andrew Jones
2020-02-11 18:23     ` Auger Eric

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