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

Jonathan Cameron
2025-11-10T17:34:47Z

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

> From: James Morse <james.morse@arm.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@arm.com>
> Reviewed-by: Fenghua Yu <fenghuay@nvdia.com>
> Tested-by: Fenghua Yu <fenghuay@nvidia.com>
> Cc: Peter Newman <peternewman@google.com>
> Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>