linux-kernel - Re: [PATCH v2 09/29] arm_mpam: Add MPAM MSC register layout definitions

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Message-ID: <323c362f-9cdb-47f1-834a-b3ee4bb04c32@web.de>
Date: Fri, 12 Sep 2025 09:33:50 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: James Morse <james.morse@....com>, linux-acpi@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Cc: LKML <linux-kernel@...r.kernel.org>,
 Amit Singh Tomar <amitsinght@...vell.com>,
 Baisheng Gao <baisheng.gao@...soc.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Ben Horgan
 <ben.horgan@....com>, Carl Worth <carl@...amperecomputing.com>,
 Catalin Marinas <catalin.marinas@....com>,
 D Scott Phillips <scott@...amperecomputing.com>,
 Danilo Krummrich <dakr@...nel.org>, Dave Martin <Dave.Martin@....com>,
 David Hildenbrand <david@...hat.com>, Drew Fustini <dfustini@...libre.com>,
 Fenghua Yu <fenghuay@...dia.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Hanjun Guo <guohanjun@...wei.com>, Jamie Iles <quic_jiles@...cinc.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, Koba Ko <kobak@...dia.com>,
 Len Brown <lenb@...nel.org>, Linu Cherian <lcherian@...vell.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Peter Newman <peternewman@...gle.com>, "Rafael J. Wysocki"
 <rafael@...nel.org>, Rob Herring <robh@...nel.org>,
 Rohit Mathew <rohit.mathew@....com>,
 Shanker Donthineni <sdonthineni@...dia.com>,
 Shaopeng Tan <tan.shaopeng@...itsu.com>, Sudeep Holla
 <sudeep.holla@....com>, Wang ShaoBo <bobo.shaobowang@...wei.com>,
 Will Deacon <will@...nel.org>, Xin Hao <xhao@...ux.alibaba.com>
Subject: Re: [PATCH v2 09/29] arm_mpam: Add MPAM MSC register layout
 definitions

…
> +++ b/drivers/resctrl/mpam_internal.h
> @@ -152,4 +152,271 @@ extern struct list_head mpam_classes;
…
> +/* Error conditions in accessing memory mapped registers */
> +#define MPAM_ERRCODE_NONE			0
> +#define MPAM_ERRCODE_PARTID_SEL_RANGE		1
…
> +#define MPAM_ERRCODE_UNEXPECTED_INTERNAL	7
…

How do you think about to use an enumeration for such a value collection?
(Is there a need to extend implementation details in similar ways
at further source code places?)

Regards,
Markus