linux-kernel - Re: [PATCH 05/33] ACPI / PPTT: Add a helper to fill a cpumask from a cache

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Message-ID: <74c37bd9-bf73-42ff-a9e9-dc55cc192c50@redhat.com>
Date: Sat, 8 Nov 2025 15:10:57 +1000
From: Gavin Shan <gshan@...hat.com>
To: Ben Horgan <ben.horgan@....com>, james.morse@....com
Cc: amitsinght@...vell.com, baisheng.gao@...soc.com,
 baolin.wang@...ux.alibaba.com, bobo.shaobowang@...wei.com,
 carl@...amperecomputing.com, catalin.marinas@....com, dakr@...nel.org,
 dave.martin@....com, david@...hat.com, dfustini@...libre.com,
 fenghuay@...dia.com, gregkh@...uxfoundation.org, guohanjun@...wei.com,
 jeremy.linton@....com, jonathan.cameron@...wei.com, kobak@...dia.com,
 lcherian@...vell.com, lenb@...nel.org, linux-acpi@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 lpieralisi@...nel.org, peternewman@...gle.com, quic_jiles@...cinc.com,
 rafael@...nel.org, robh@...nel.org, rohit.mathew@....com,
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 tan.shaopeng@...itsu.com, will@...nel.org, xhao@...ux.alibaba.com
Subject: Re: [PATCH 05/33] ACPI / PPTT: Add a helper to fill a cpumask from a
 cache_id

On 11/7/25 10:34 PM, Ben Horgan wrote:
> From: James Morse <james.morse@....com>
> 
> MPAM identifies CPUs by the cache_id in the PPTT cache structure.
> 
> The driver needs to know which CPUs are associated with the cache.
> The CPUs may not all be online, so cacheinfo does not have the
> information.
> 
> Add a helper to pull this information out of the PPTT.
> 
> CC: Rohit Mathew <Rohit.Mathew@....com>
> Signed-off-by: James Morse <james.morse@....com>
> Signed-off-by: Ben Horgan <ben.horgan@....com>
> ---
> Changes since v3:
> Equivalent changes to the previous patch:
>   Tags dropped due to rework
>   Fallout/simplification from adding acpi_pptt_cache_v1_full
>   Look for each cache type before incrementing level
> ---
>   drivers/acpi/pptt.c  | 62 ++++++++++++++++++++++++++++++++++++++++++++
>   include/linux/acpi.h |  6 +++++
>   2 files changed, 68 insertions(+)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>