linux-kernel - RE: [PATCH 14/33] arm_mpam: Probe hardware to find the supported partid/pmg values

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Date: Wed, 12 Nov 2025 07:57:45 +0000
From: "Shaopeng Tan (Fujitsu)" <tan.shaopeng@...itsu.com>
To: 'Ben Horgan' <ben.horgan@....com>, "james.morse@....com"
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Subject: RE: [PATCH 14/33] arm_mpam: Probe hardware to find the supported
 partid/pmg values

> From: James Morse <james.morse@....com>
> 
> CPUs can generate traffic with a range of PARTID and PMG values, but each
> MSC may also have its own maximum size for these fields.
> Before MPAM can be used, the driver needs to probe each RIS on each MSC, to
> find the system-wide smallest value that can be used.
> The limits from requestors (e.g. CPUs) also need taking into account.
> 
> While doing this, RIS entries that firmware didn't describe are created under
> MPAM_CLASS_UNKNOWN.
> 
> This adds the low level MSC write accessors.
> 
> While we're here, implement the mpam_register_requestor() call for the arch
> code to register the CPU limits. Future callers of this will tell us about the
> SMMU and ITS.
> 
> Signed-off-by: James Morse <james.morse@....com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> Reviewed-by: Ben Horgan <ben.horgan@....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>