linux-kernel - Re: [PATCH v8 21/32] x86,fs/resctrl: Add architectural event pointer

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Message-ID: <c3a1f8e4-d226-4ab5-91c9-d018d43c77e9@intel.com>
Date: Thu, 14 Aug 2025 14:43:19 -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 21/32] x86,fs/resctrl: Add architectural event pointer

Hi Tony,

On 8/11/25 11:16 AM, Tony Luck wrote:
> The resctrl file system layer passes the domain, RMID, and event id to
> resctrl_arch_rmid_read() to fetch an event counter.
> 
> For some resources this is not enough information to efficiently access
> the counter. Fetching a telemetry event counter requires additional

The vague first sentence can now be dropped.

> information that is private to the architecture, for example, the offset
> into MMIO space from where counter should be read.
> 
> Add mon_evt::arch_priv void pointer. Architecture code can initialize
> this when marking each event enabled.
> 
> File system code passes this pointer to resctrl_arch_rmid_read().
> 
> Suggested-by: Reinette Chatre <reinette.chatre@...el.com>
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---
Reinette