linux-kernel - Re: [PATCH v15 17/32] x86,fs/resctrl: Fill in details of events for guid 0x26696143 and 0x26557651

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Message-ID: <ac238824-c7ae-44e8-864f-502a43178a5b@intel.com>
Date: Tue, 9 Dec 2025 11:41:23 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghuay@...dia.com>, "Maciej
 Wieczor-Retman" <maciej.wieczor-retman@...el.com>, Peter Newman
	<peternewman@...gle.com>, James Morse <james.morse@....com>, Babu Moger
	<babu.moger@....com>, Drew Fustini <dfustini@...libre.com>, Dave Martin
	<Dave.Martin@....com>, Chen Yu <yu.c.chen@...el.com>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v15 17/32] x86,fs/resctrl: Fill in details of events for
 guid 0x26696143 and 0x26557651

Hi Tony,

On 12/4/25 12:53 PM, Tony Luck wrote:
> The telemetry event aggregators of the Intel Clearwater Forest CPU support
> two RMID-based feature types: "energy" with guid 0x26696143 [1], and "perf"
> with guid 0x26557651 [2].
> 
> The event counter offsets in an aggregator's MMIO space are arranged in
> groups for each RMID.
> 
> E.g the "energy" counters for guid 0x26696143 are arranged like this:
> 
>         MMIO offset:0x0000 Counter for RMID 0 PMT_EVENT_ENERGY
>         MMIO offset:0x0008 Counter for RMID 0 PMT_EVENT_ACTIVITY
>         MMIO offset:0x0010 Counter for RMID 1 PMT_EVENT_ENERGY
>         MMIO offset:0x0018 Counter for RMID 1 PMT_EVENT_ACTIVITY
>         ...
>         MMIO offset:0x23F0 Counter for RMID 575 PMT_EVENT_ENERGY
>         MMIO offset:0x23F8 Counter for RMID 575 PMT_EVENT_ACTIVITY
> 
> After all counters there are three status registers that provide indications
> of how many times an aggregator was unable to process event counts, the time
> stamp for the most recent loss of data, and the time stamp of the most recent
> successful update.
> 
> 	MMIO offset:0x2400 AGG_DATA_LOSS_COUNT
> 	MMIO offset:0x2408 AGG_DATA_LOSS_TIMESTAMP
> 	MMIO offset:0x2410 LAST_UPDATE_TIMESTAMP
> 
> Define event_group structures for both of these aggregator types and define the
> events tracked by the aggregators in the file system code.
> 
> PMT_EVENT_ENERGY and PMT_EVENT_ACTIVITY are produced in fixed point
> format. File system code must output as floating point values.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> Link: https://github.com/intel/Intel-PMT/blob/main/xml/CWF/OOBMSM/RMID-ENERGY/cwf_aggregator.xml # [1]
> Link: https://github.com/intel/Intel-PMT/blob/main/xml/CWF/OOBMSM/RMID-PERF/cwf_aggregator.xml # [2]
> ---

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

Reinette