Re: [kvm-unit-tests PATCH v2 4/9] arm: pmu: Check Required Event Support

[Peter Maydell <peter.maydell@linaro.org>]

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
> +        * 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);

As with satisfy_prerequisites(), printing this with "0x%x"
would probably be more helpful to most users.

thanks
-- PMM
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