linux-kernel - Re: [PATCH v11 00/23] x86/resctrl : Support AMD Assignable Bandwidth Monitoring Counters (ABMC)

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Message-ID: <7e4a685f-47db-4425-bb8f-20340ae15a93@arm.com>
Date: Fri, 21 Feb 2025 18:07:59 +0000
From: James Morse <james.morse@....com>
To: Babu Moger <babu.moger@....com>, corbet@....net,
 reinette.chatre@...el.com, tglx@...utronix.de, mingo@...hat.com,
 bp@...en8.de, dave.hansen@...ux.intel.com, tony.luck@...el.com,
 peternewman@...gle.com
Cc: fenghua.yu@...el.com, x86@...nel.org, hpa@...or.com, paulmck@...nel.org,
 akpm@...ux-foundation.org, thuth@...hat.com, rostedt@...dmis.org,
 xiongwei.song@...driver.com, pawan.kumar.gupta@...ux.intel.com,
 daniel.sneddon@...ux.intel.com, jpoimboe@...nel.org, perry.yuan@....com,
 sandipan.das@....com, kai.huang@...el.com, xiaoyao.li@...el.com,
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 ebiggers@...gle.com, mario.limonciello@....com, tan.shaopeng@...itsu.com,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 maciej.wieczor-retman@...el.com, eranian@...gle.com
Subject: Re: [PATCH v11 00/23] x86/resctrl : Support AMD Assignable Bandwidth
 Monitoring Counters (ABMC)

Hi Babu,

On 22/01/2025 20:20, Babu Moger wrote:
> This series adds the support for Assignable Bandwidth Monitoring Counters
> (ABMC). It is also called QoS RMID Pinning feature
> 
> Series is written such that it is easier to support other assignable
> features supported from different vendors.
> 
> 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). The documentation is available at
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
> 
> The patches are based on top of commit
> d361b84d51bfe (tip/master) Merge branch into tip/master: 'x86/tdx'

I've rebased the MPAM tree on top of this v11, here:
https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/log/?h=mpam/abmc/v11
Hopefully this is sufficient evidence that this interface works for MPAM.

It would be convenient for MPAM platforms to not have to support a 'default' mode if they
are emulating ABMC - this was something that was never supported, and its not a problem
that can be solved. (comments on the relevant patches).


Thanks,

James