linux-kernel - Re: [PATCH v5 28/34] arm_mpam: Consider overflow in bandwidth counter state

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Message-ID: <552ffc50-70c0-46db-b2af-eec7b511ec82@nvidia.com>
Date: Tue, 18 Nov 2025 20:27:16 -0800
From: Fenghua Yu <fenghuay@...dia.com>
To: Ben Horgan <ben.horgan@....com>, james.morse@....com
Cc: amitsinght@...vell.com, baisheng.gao@...soc.com,
 baolin.wang@...ux.alibaba.com, bobo.shaobowang@...wei.com,
 carl@...amperecomputing.com, catalin.marinas@....com, dakr@...nel.org,
 dave.martin@....com, david@...hat.com, dfustini@...libre.com,
 gregkh@...uxfoundation.org, gshan@...hat.com, guohanjun@...wei.com,
 jeremy.linton@....com, jonathan.cameron@...wei.com, kobak@...dia.com,
 lcherian@...vell.com, lenb@...nel.org, linux-acpi@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 lpieralisi@...nel.org, peternewman@...gle.com, quic_jiles@...cinc.com,
 rafael@...nel.org, robh@...nel.org, rohit.mathew@....com,
 scott@...amperecomputing.com, sdonthineni@...dia.com, sudeep.holla@....com,
 tan.shaopeng@...itsu.com, will@...nel.org, xhao@...ux.alibaba.com,
 Zeng Heng <zengheng4@...wei.com>
Subject: Re: [PATCH v5 28/34] arm_mpam: Consider overflow in bandwidth counter
 state



On 11/17/25 09:00, Ben Horgan wrote:
> Use the overflow status bit to track overflow on each bandwidth counter
> read and add the counter size to the correction when overflow is detected.
> 
> This assumes that only a single overflow has occurred since the last read
> of the counter. Overflow interrupts, on hardware that supports them could
> be used to remove this limitation.
> 
> Cc: Zeng Heng <zengheng4@...wei.com>
> Reviewed-by: Gavin Shan <gshan@...hat.com>
> Reviewed-by: Zeng Heng <zengheng4@...wei.com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> Tested-by: Carl Worth <carl@...amperecomputing.com>
> Tested-by: Gavin Shan <gshan@...hat.com>
> Tested-by: Zeng Heng <zengheng4@...wei.com>
> Signed-off-by: Ben Horgan <ben.horgan@....com>

Reviewed-by: Fenghua Yu <fenghuay@...dia.com>

Thanks.

-Fenghua