linux-kernel - Re: [PATCH v5 23/34] arm_mpam: Allow configuration to be applied and restored during cpu online

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Message-ID: <20251118153928.00000a2f@huawei.com>
Date: Tue, 18 Nov 2025 15:39:28 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Ben Horgan <ben.horgan@....com>
CC: <james.morse@....com>, <amitsinght@...vell.com>,
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	<tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v5 23/34] arm_mpam: Allow configuration to be applied
 and restored during cpu online

On Mon, 17 Nov 2025 17:00:02 +0000
Ben Horgan <ben.horgan@....com> wrote:

> From: James Morse <james.morse@....com>
> 
> When CPUs come online the MSC's original configuration should be restored.
> 
> Add struct mpam_config to hold the configuration. For each component, this
> has a bitmap of features that have been changed from the reset values. The
> mpam_config is also used on RIS reset where all bits are set to ensure all
> features are reset.
> 
> Once the maximum partid is known, allocate a configuration array for each
> component, and reprogram each RIS configuration from this.
> 
> CC: Dave Martin <Dave.Martin@....com>
> Signed-off-by: James Morse <james.morse@....com>
> Cc: Shaopeng Tan (Fujitsu) tan.shaopeng@...itsu.com
> Cc: Peter Newman peternewman@...gle.com
> Reviewed-by: Gavin Shan <gshan@...hat.com>
> Tested-by: Carl Worth <carl@...amperecomputing.com>
> Tested-by: Gavin Shan <gshan@...hat.com>
> Tested-by: Zeng Heng <zengheng4@...wei.com>
> Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
> Signed-off-by: Ben Horgan <ben.horgan@....com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>