linux-kernel - Re: [PATCH v13 20/32] x86/resctrl: Read telemetry events

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Message-ID: <a7c3bf62-2356-466d-a95f-8b17ea98e3b1@intel.com>
Date: Thu, 13 Nov 2025 14:47:41 -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 v13 20/32] x86/resctrl: Read telemetry events

Hi Tony,

On 10/29/25 9:21 AM, Tony Luck wrote:
> @@ -217,3 +221,51 @@ void __exit intel_aet_exit(void)
>  		}
>  	}
>  }
> +
> +#define DATA_VALID	BIT_ULL(63)
> +#define DATA_BITS	GENMASK_ULL(62, 0)
> +
> +/*
> + * Read counter for an event on a domain (summing all aggregators
> + * on the domain). If an aggregator hasn't received any data for a
> + * specific RMID, the MMIO read indicates that data is not valid.
> + * Return success if at least one aggregator has valid data.
> + */
> +int intel_aet_read_event(int domid, u32 rmid, enum resctrl_event_id eventid,
> +			 void *arch_priv, u64 *val)

Is eventid needed? It could perhaps be used as a sanity check of
pevt->id but if it is not used then it can be dropped.

Reinette