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

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Message-ID:
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Date: Fri, 14 Nov 2025 07:04:09 +0000
From: "Shaopeng Tan (Fujitsu)" <tan.shaopeng@...itsu.com>
To: 'Ben Horgan' <ben.horgan@....com>, "james.morse@....com"
	<james.morse@....com>
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Subject: RE: [PATCH 24/33] arm_mpam: Probe and reset the rest of the features

> 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>

Reviewed-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>