linux-kernel - Re: [PATCH v9 17/26] x86/resctrl: Implement resctrl_arch_config

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Message-ID: <5a7d8ff1-91c7-4e75-9730-3aa0703274a6@intel.com>
Date: Fri, 15 Nov 2024 16:44:20 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <corbet@....net>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>
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	<thuth@...hat.com>, <paulmck@...nel.org>, <rostedt@...dmis.org>,
	<akpm@...ux-foundation.org>, <xiongwei.song@...driver.com>,
	<pawan.kumar.gupta@...ux.intel.com>, <daniel.sneddon@...ux.intel.com>,
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	<maciej.wieczor-retman@...el.com>, <eranian@...gle.com>,
	<jpoimboe@...nel.org>, <thomas.lendacky@....com>
Subject: Re: [PATCH v9 17/26] x86/resctrl: Implement
 resctrl_arch_config_cntr() to assign a counter with ABMC

Hi Babu,

On 10/29/24 4:21 PM, Babu Moger wrote:
> The ABMC feature provides an option to the user to assign a hardware
> counter to an RMID, event pair and monitor the bandwidth as long as it is
> assigned. The assigned RMID will be tracked by the hardware until the user
> unassigns it manually.
> 
> Counters are configured by writing to L3_QOS_ABMC_CFG MSR and
> specifying the counter id, bandwidth source, and bandwidth types.

needs imperative tone

> 
> Provide the interface to assign the counter ids to RMID.
> 
> 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>

Reinette