[PATCH v6 18/40] arm_mpam: resctrl: Implement helpers to update configuration

[Gavin Shan]

On 3/14/26 12:45 AM, Ben Horgan wrote:
> From: James Morse <james.morse at arm.com>
> 
> resctrl has two helpers for updating the configuration.
> resctrl_arch_update_one() updates a single value, and is used by the
> software-controller to apply feedback to the bandwidth controls, it has to
> be called on one of the CPUs in the resctrl:domain.
> 
> resctrl_arch_update_domains() copies multiple staged configurations, it can
> be called from anywhere.
> 
> Both helpers should update any changes to the underlying hardware.
> 
> Implement resctrl_arch_update_domains() to use
> resctrl_arch_update_one(). Neither need to be called on a specific CPU as
> the mpam driver will send IPIs as needed.
> 
> Tested-by: Gavin Shan <gshan at redhat.com>
> Tested-by: Shaopeng Tan <tan.shaopeng at jp.fujitsu.com>
> Tested-by: Peter Newman <peternewman at google.com>
> Tested-by: Zeng Heng <zengheng4 at huawei.com>
> Tested-by: Punit Agrawal <punit.agrawal at oss.qualcomm.com>
> Reviewed-by: Zeng Heng <zengheng4 at huawei.com>
> Reviewed-by: Shaopeng Tan <tan.shaopeng at jp.fujitsu.com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron at huawei.com>
> Signed-off-by: James Morse <james.morse at arm.com>
> Signed-off-by: Ben Horgan <ben.horgan at arm.com>
> ---
> Changes since rfc:
> list_for_each_entry -> list_for_each_entry_rcu
> return 0
> Restrict scope of local variables
> 
> Changes since v2:
> whitespace fix
> ---
>   drivers/resctrl/mpam_resctrl.c | 70 ++++++++++++++++++++++++++++++++++
>   1 file changed, 70 insertions(+)
> 
Reviewed-by: Gavin Shan <gshan at redhat.com>