linux-kernel - Re: [PATCH 31/33] arm_mpam: Add helper to reset saved mbwu state

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Message-ID: <20251110173442.000053fe@huawei.com>
Date: Mon, 10 Nov 2025 17:34:42 +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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Subject: Re: [PATCH 31/33] arm_mpam: Add helper to reset saved mbwu state

On Fri, 7 Nov 2025 12:34:48 +0000
Ben Horgan <ben.horgan@....com> wrote:

> From: James Morse <james.morse@....com>
> 
> resctrl expects to reset the bandwidth counters when the filesystem
> is mounted.
> 
> To allow this, add a helper that clears the saved mbwu state. Instead
> of cross calling to each CPU that can access the component MSC to
> write to the counter, set a flag that causes it to be zero'd on the
> the next read. This is easily done by forcing a configuration update.
> 
> Signed-off-by: James Morse <james.morse@....com>
> Reviewed-by: Fenghua Yu <fenghuay@...ia.com>
> Tested-by: Fenghua Yu <fenghuay@...dia.com>
> Cc: Peter Newman <peternewman@...gle.com>
> Signed-off-by: Ben Horgan <ben.horgan@....com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>