Re: [PATCH v4 1/7] arm64: add support for the AMU extension v1

[Valentin Schneider]

Ionela Voinescu writes:

> The activity monitors extension is an optional extension introduced
> by the ARMv8.4 CPU architecture. This implements basic support for
> version 1 of the activity monitors architecture, AMUv1.
>
> This support includes:
> - Extension detection on each CPU (boot, secondary, hotplugged)
> - Register interface for AMU aarch64 registers
> - amu=[0/1/on/off/y/n] kernel parameter to disable detection and
>   counter access at runtime
>
> Signed-off-by: Ionela Voinescu <ionela.voinescu@xxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> Cc: Marc Zyngier <maz@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>

Reviewed-by: Valentin Schneider <valentin.schneider@xxxxxxx>