linux-kernel - Re: [PATCH v16 16/34] x86,fs/resctrl: Implement resctrl_arch_config

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Message-ID: <642ff1fc-3a79-4aff-b226-599d1a089516@intel.com>
Date: Wed, 30 Jul 2025 12:50:28 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<james.morse@....com>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <Dave.Martin@....com>, <x86@...nel.org>, <hpa@...or.com>,
	<akpm@...ux-foundation.org>, <paulmck@...nel.org>, <rostedt@...dmis.org>,
	<Neeraj.Upadhyay@....com>, <david@...hat.com>, <arnd@...db.de>,
	<fvdl@...gle.com>, <seanjc@...gle.com>, <jpoimboe@...nel.org>,
	<pawan.kumar.gupta@...ux.intel.com>, <xin@...or.com>,
	<manali.shukla@....com>, <tao1.su@...ux.intel.com>, <sohil.mehta@...el.com>,
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	<gautham.shenoy@....com>, <chang.seok.bae@...el.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>, <eranian@...gle.com>
Subject: Re: [PATCH v16 16/34] x86,fs/resctrl: Implement
 resctrl_arch_config_cntr() to assign a counter with ABMC

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@....com>
> ---

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

Reinette