linux-kernel - Re: [PATCH v5 2/9] ACPI/PPTT: Add Processor Properties Topology Table parsing

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Date:   Tue, 12 Dec 2017 02:10:15 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Jeremy Linton <jeremy.linton@....com>, sudeep.holla@....com,
        hanjun.guo@...aro.org, lorenzo.pieralisi@....com
Cc:     linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        will.deacon@....com, catalin.marinas@....com,
        gregkh@...uxfoundation.org, viresh.kumar@...aro.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, jhugo@...eaurora.org,
        wangxiongfeng2@...wei.com, Jonathan.Zhang@...ium.com,
        ahs3@...hat.com, Jayachandran.Nair@...ium.com,
        austinwc@...eaurora.org, lenb@...nel.org
Subject: Re: [PATCH v5 2/9] ACPI/PPTT: Add Processor Properties Topology Table parsing

On Friday, December 1, 2017 11:23:23 PM CET Jeremy Linton wrote:
> ACPI 6.2 adds a new table, which describes how processing units
> are related to each other in tree like fashion. Caches are
> also sprinkled throughout the tree and describe the properties
> of the caches in relation to other caches and processing units.
> 
> Add the code to parse the cache hierarchy and report the total
> number of levels of cache for a given core using
> acpi_find_last_cache_level() as well as fill out the individual
> cores cache information with cache_setup_acpi() once the
> cpu_cacheinfo structure has been populated by the arch specific
> code.
> 
> An additional patch later in the set adds the ability to report
> peers in the topology using find_acpi_cpu_topology()
> to report a unique ID for each processing unit at a given level
> in the tree. These unique id's can then be used to match related
> processing units which exist as threads, COD (clusters
> on die), within a given package, etc.
> 
> Signed-off-by: Jeremy Linton <jeremy.linton@....com>

This is only going to be used by ARM64 for the time being, so I need
someone from that camp to review this.

Sudeep, Hanjun, Lorenzo?

Thanks,
Rafael