[PATCH v2 3/6] arm64/perf: Filter common events based on PMCEIDn_EL0

[Suzuki.Poulose@arm.com (Suzuki K. Poulose)]

On 24/03/16 12:52, Ashok Kumar wrote:
> The complete common architectural and micro-architectural
> event number structure is filtered based on PMCEIDn_EL0 and
> copied to a new structure which is exposed to /sys
>
> The function which derives event bitmap from PMCEIDn_EL0 is
> executed in the cpus, which has the pmu being initialized,
> for heterogeneous pmu support.
>
> Enforced armv8_pmuv3_event_attrs array for event number
> ordering as this is indexed with event number now.
>
> Signed-off-by: Ashok Kumar <ashoks@broadcom.com>
> ---
>   arch/arm64/kernel/perf_event.c | 281 ++++++++++++++++++++++++++++-------------
>   1 file changed, 195 insertions(+), 86 deletions(-)
>

> +static inline u32 armv8pmu_pmceidn_read(int reg)
> +{
> +	u32 val = 0;
> +
> +	if (reg == 0)
> +		asm volatile("mrs %0, pmceid0_el0" : "=r" (val));
> +	else if (reg == 1)
> +		asm volatile("mrs %0, pmceid1_el0" : "=r" (val));
> +
> +	return val;
> +}

> +	reg[0] = armv8pmu_pmceidn_read(0);
> +	reg[1] = armv8pmu_pmceidn_read(1);

Could we not add definitions for SYS_PMCEID0_EL0 and SYS_PMCEID1_EL0
in asm/sysreg.h and simply do

reg[0] = read_cpuid(SYS_PMCEID0_EL0);
reg[1] = read_cpuid(SYS_PMCEID1_EL0);

?

Thanks
Suzuki