Re: [PATCH v3] cpuidle, ACPI: Evaluate LPI arch_flags for broadcast timer

[Marc Zyngier]

On 2023-08-29 21:11, Oza Pawandeep wrote:
> Arm® Functional Fixed Hardware Specification defines LPI states,
> which provide an architectural context loss flags field that can
> be used to describe the context that might be lost when an LPI
> state is entered.
>
> - Core context Lost
>         - General purpose registers.
>         - Floating point and SIMD registers.
>         - System registers, include the System register based
>         - generic timer for the core.
>         - Debug register in the core power domain.
>         - PMU registers in the core power domain.
>         - Trace register in the core power domain.
> - Trace context loss
> - GICR
> - GICD
>
> Qualcomm's custom CPUs preserves the architectural state,
> including keeping the power domain for local timers active.
> when core is power gated, the local timers are sufficient to
> wake the core up without needing broadcast timer.

Isn't that what should be exposed by GTDT when ACPI_GTDT_ALWAYS_ON
is set on the relevant interrupt and EL? The arch timer already
deals with that.

Why do we need anything else?

Thanks,

        M.
--
Jazz is not dead. It just smells funny...