linux-kernel - Re: [PATCH 0/6] cacheinfo: CPU affinity and Devicetree 'id' support

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Date:   Tue, 21 Dec 2021 10:31:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Rob Herring <robh@...nel.org>
Cc:     James Morse <james.morse@....com>,
        Jeremy Linton <jeremy.linton@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sudeep Holla <sudeep.holla@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, devicetree@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH 0/6] cacheinfo: CPU affinity and Devicetree 'id' support

On Thu, Dec 16, 2021 at 05:31:19PM -0600, Rob Herring wrote:
> For upcoming Arm MPAM support in resctrl, it is necessary to have the
> cacheinfo 'id' for MPAM enabled caches. The 'id' is part of the resctrl
> ABI. While this support already exists for ACPI based systems, it is
> missing for DT. This series adds the support.
> 
> The 'id' value used is the smallest CPU h/w id value associated with a
> cache. This requires walking the cache hierarchy from every CPU node to
> get all CPUs associated with a cache. As MPAM also needs to know this,
> the CPU affinity is also saved to avoid reimplementing and walking the
> firmware tables again.
> 
> Patches 1 and 2 are v2 from the prior series[1]. The rest are new.
> 
> Tested on arm64 with DT. ACPI changes are untested. I don't have a
> system with an appropriate PPTT nor do I know how to modify ACPI tables.
> 
> Rob
> 
> [1] https://lore.kernel.org/all/20211006164332.1981454-1-robh@kernel.org/
> 
> Rob Herring (6):
>   cacheinfo: Allow for >32-bit cache 'id'
>   cacheinfo: Set cache 'id' based on DT data
>   cacheinfo: Add cpu_affinity_map to store affinity for all CPUs
>   ACPI / PPTT: Populate the cacheinfo.cpu_affinity_map
>   cacheinfo: Use cpu_affinity_map for populating shared_cpu_map
>   cacheinfo: Add cacheinfo_get_cache_affinity() function
> 
>  drivers/acpi/pptt.c       | 29 +++++++++++++++--
>  drivers/base/cacheinfo.c  | 65 ++++++++++++++++++++++++++-------------
>  include/linux/cacheinfo.h | 29 +++++++++++++++--
>  3 files changed, 97 insertions(+), 26 deletions(-)
> 
> -- 
> 2.32.0
> 

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>