Re: [PATCH v16 16/34] x86,fs/resctrl: Implement resctrl_arch_config_cntr() to assign a counter with ABMC

[Reinette Chatre]

Hi Babu,

On 7/25/25 11:29 AM, Babu Moger wrote:
> The ABMC feature allows users to assign a hardware counter to an RMID,
> event pair and monitor bandwidth usage as long as it is assigned. The
> hardware continues to track the assigned counter until it is explicitly
> unassigned by the user.
> 
> Implement an x86 architecture-specific handler to configure a counter. This
> architecture specific handler is called by resctrl fs when a counter is
> assigned or unassigned as well as when an already assigned counter's
> configuration should be updated. Configure counters by writing to the
> L3_QOS_ABMC_CFG MSR, specifying the counter ID, bandwidth source (RMID),
> and event configuration.
> 
> The feature details are documented in the APM listed below [1].
> [1] AMD64 Architecture Programmer's Manual Volume 2: System Programming
>     Publication # 24593 Revision 3.41 section 19.3.3.3 Assignable Bandwidth
>     Monitoring (ABMC).
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
> Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
> ---

Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>

Reinette