linux-kernel - Re: [PATCH v7 15/24] x86/resctrl: Implement resctrl_arch_assign

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Message-ID: <710c3d2c-ef18-4534-982c-a62761a09f96@intel.com>
Date: Thu, 19 Sep 2024 10:13:16 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <corbet@....net>, <fenghua.yu@...el.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
	<rdunlap@...radead.org>, <tj@...nel.org>, <peterz@...radead.org>,
	<yanjiewtw@...il.com>, <kim.phillips@....com>, <lukas.bulwahn@...il.com>,
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	<jpoimboe@...nel.org>, <rick.p.edgecombe@...el.com>,
	<kirill.shutemov@...ux.intel.com>, <jithu.joseph@...el.com>,
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	<daniel.sneddon@...ux.intel.com>, <pbonzini@...hat.com>,
	<sandipan.das@....com>, <ilpo.jarvinen@...ux.intel.com>,
	<peternewman@...gle.com>, <maciej.wieczor-retman@...el.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<eranian@...gle.com>, <james.morse@....com>
Subject: Re: [PATCH v7 15/24] x86/resctrl: Implement resctrl_arch_assign_cntr
 to assign a counter with ABMC

Hi Babu,

In subject, please use "()" for a function.

On 9/4/24 3:21 PM, Babu Moger wrote:
> +/*
> + * Send an IPI to the domain to assign the counter to RMID, event pair.
> + */
> +int resctrl_arch_assign_cntr(struct rdt_resource *r, struct rdt_mon_domain *d,
> +			     enum resctrl_event_id evtid, u32 rmid, u32 closid,
> +			     u32 cntr_id, bool assign)

Looking ahead this is also called when config of existing assigned counter is
changed. Should this thus perhaps be resctrl_arch_config_cntr()? 

> +{
> +	struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
> +	union l3_qos_abmc_cfg abmc_cfg = { 0 };
> +	struct arch_mbm_state *arch_mbm;
> +
> +	abmc_cfg.split.cfg_en = 1;

Just to confirm ... a counter remains "configured" from the hardware side whether it
is assigned from resctrl perspective or not? It seems to me that once a counter is
"unassigned" from resctrl perspective it needs no more context about that
counter, yet it remains configured from hardware side?

Reinette