[PATCH 1/2] arm64: topology: Prefer PE0 on NVIDIA Olympus SMT cores

[Dietmar Eggemann]

On 09.09.26 08:26, Andrea Righi wrote:

[...]

> +void __init arm64_init_sched_topology(void)
> +{
> +	if (!IS_ENABLED(CONFIG_SCHED_SMT))
> +		return;
> +
> +	if ((read_cpuid_id() & MIDR_CPU_MODEL_MASK) != MIDR_NVIDIA_OLYMPUS)
> +		return;
> +
> +	if (!topology_core_has_smt(smp_processor_id()))
> +		return;
> +
> +	set_sched_topology(arm64_asym_smt_topology);
> +	pr_info("Enabling PE0 SMT preference for NVIDIA Olympus\n");

I'm not really a big fan of using this arm64 setup for NVIDIA Olympus
alone here.

> +}
> +
> +int arch_asym_cpu_priority(int cpu)
> +{
> +	return MPIDR_AFFINITY_LEVEL(cpu_logical_map(cpu), 0) == 0;
> +}
> +

This is done since it will only be called for NVIDIA Olympus since it's
the only CPU model enabling this. I think it will work but it's still
ugly :-)

[...]