linux-kernel - Re: [PATCH v8 20/32] x86,fs/resctrl: Fill in details of events for guid 0x26696143 and 0x26557651

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Message-ID: <a13f26db-3c0c-4784-b1c5-0a9b3117e5c1@intel.com>
Date: Thu, 14 Aug 2025 14:42:56 -0700
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 v8 20/32] x86,fs/resctrl: Fill in details of events for
 guid 0x26696143 and 0x26557651

Hi Tony,

On 8/11/25 11:16 AM, Tony Luck wrote:
> These two guids describe the events supported on Clearwater Forest.

Please let changelog stand on its own and not be a continuation of the
subject.

> 
> The offsets in 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
> 
> Define these events in the file system code and add the events
> to the event_group structures.

Please add a note/link where these values are obtained from.

> 
> 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>
> ---

Reinette