linux-kernel - Re: [PATCH 24/33] arm_mpam: Probe and reset the rest of the features

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Message-ID: <9c744ab8-d555-4202-905f-015a13c377da@redhat.com>
Date: Mon, 10 Nov 2025 09:01:12 +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,
 scott@...amperecomputing.com, sdonthineni@...dia.com, sudeep.holla@....com,
 tan.shaopeng@...itsu.com, will@...nel.org, xhao@...ux.alibaba.com,
 Zeng Heng <zengheng4@...wei.com>, Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH 24/33] arm_mpam: Probe and reset the rest of the features

On 11/7/25 10:34 PM, Ben Horgan wrote:
> From: James Morse <james.morse@....com>
> 
> MPAM supports more features than are going to be exposed to resctrl.
> For partid other than 0, the reset values of these controls isn't
> known.
> 
> Discover the rest of the features so they can be reset to avoid any
> side effects when resctrl is in use.
> 
> PARTID narrowing allows MSC/RIS to support less configuration space than
> is usable. If this feature is found on a class of device we are likely
> to use, then reduce the partid_max to make it usable. This allows us
> to map a PARTID to itself.
> 
> CC: Rohit Mathew <Rohit.Mathew@....com>
> CC: Zeng Heng <zengheng4@...wei.com>
> CC: Dave Martin <Dave.Martin@....com>
> Signed-off-by: James Morse <james.morse@....com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> Tested-by: Fenghua Yu <fenghuay@...dia.com>
> Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
> Tested-by: Peter Newman <peternewman@...gle.com>
> Signed-off-by: Ben Horgan <ben.horgan@....com>
> ---
> Changes since v3:
> enum order and commas
> ---
>   drivers/resctrl/mpam_devices.c  | 188 ++++++++++++++++++++++++++++++++
>   drivers/resctrl/mpam_internal.h |  18 +++
>   2 files changed, 206 insertions(+)
> 
Reviewed-by: Gavin Shan <gshan@...hat.com>