linux-kernel - Re: [PATCH v3 25/29] arm_mpam: Probe for long/lwd mbwu counters

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Message-ID: <20251024192451.00007ffb@huawei.com>
Date: Fri, 24 Oct 2025 19:24:51 +0100
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: James Morse <james.morse@....com>
CC: <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
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Subject: Re: [PATCH v3 25/29] arm_mpam: Probe for long/lwd mbwu counters

On Fri, 17 Oct 2025 18:56:41 +0000
James Morse <james.morse@....com> wrote:

> From: Rohit Mathew <rohit.mathew@....com>
> 
> mpam v0.1 and versions above v1.0 support optional long counter for
> memory bandwidth monitoring. The MPAMF_MBWUMON_IDR register has fields
> indicating support for long counters.
> 
> Probe these feature bits.
> 
> The mpam_feat_msmon_mbwu feature is used to indicate that bandwidth
> monitors are supported, instead of muddling this with which size of
> bandwidth monitors, add an explicit 31 bit counter feature.
> 
> Signed-off-by: Rohit Mathew <rohit.mathew@....com>
> [ morse: Added 31bit counter feature to simplify later logic ]
> Signed-off-by: James Morse <james.morse@....com>
> Reviewed-by: Ben Horgan <ben.horgan@....com>
> Tested-by: Fenghua Yu <fenghuay@...dia.com>
With or without the change Ben suggested.
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>