linux-kernel - Re: [PATCH v9 07/13] x86/resctrl: Introduce data structure to support monitor configuration

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Message-ID: <20ea6828-8ca9-3106-7eac-00fd9cec5fed@intel.com>
Date:   Thu, 15 Dec 2022 09:19:09 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Babu Moger <babu.moger@....com>, <corbet@....net>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC:     <fenghua.yu@...el.com>, <dave.hansen@...ux.intel.com>,
        <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
        <akpm@...ux-foundation.org>, <quic_neeraju@...cinc.com>,
        <rdunlap@...radead.org>, <damien.lemoal@...nsource.wdc.com>,
        <songmuchun@...edance.com>, <peterz@...radead.org>,
        <jpoimboe@...nel.org>, <pbonzini@...hat.com>,
        <chang.seok.bae@...el.com>, <pawan.kumar.gupta@...ux.intel.com>,
        <jmattson@...gle.com>, <daniel.sneddon@...ux.intel.com>,
        <sandipan.das@....com>, <tony.luck@...el.com>,
        <james.morse@....com>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bagasdotme@...il.com>,
        <eranian@...gle.com>, <christophe.leroy@...roup.eu>,
        <jarkko@...nel.org>, <adrian.hunter@...el.com>,
        <quic_jiles@...cinc.com>, <peternewman@...gle.com>
Subject: Re: [PATCH v9 07/13] x86/resctrl: Introduce data structure to support
 monitor configuration

Hi Babu,

I do not see a new data structure introduced. Perhaps subject
could just be:
x86/resctrl: Support monitor configuration

On 12/1/2022 7:36 AM, Babu Moger wrote:
> Add a new field in mon_evt to support Bandwidth Monitoring Event

"mon_evt" -> "struct mon_evt"

> Configuration(BMEC) and also update the "mon_features" display.
> 
> The resctrl file "mon_features" will display the supported events
> and files that can be used to configure those events if monitor
> configuration is supported.
> 
> Before the change.
> 	$cat /sys/fs/resctrl/info/L3_MON/mon_features
> 	llc_occupancy
> 	mbm_total_bytes
> 	mbm_local_bytes
> 
> After the change when BMEC is supported.
> 	$cat /sys/fs/resctrl/info/L3_MON/mon_features
> 	llc_occupancy
> 	mbm_total_bytes
> 	mbm_total_bytes_config
> 	mbm_local_bytes
> 	mbm_local_bytes_config
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
>  arch/x86/kernel/cpu/resctrl/internal.h |    2 ++
>  arch/x86/kernel/cpu/resctrl/monitor.c  |    7 +++++++
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c |    5 ++++-
>  3 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 7bbfc10094b6..b36750334deb 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -52,11 +52,13 @@ DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);
>   * struct mon_evt - Entry in the event list of a resource
>   * @evtid:		event id
>   * @name:		name of the event
> + * @configurable:	true if the event is configurable
>   * @list:		entry in &rdt_resource->evt_list
>   */
>  struct mon_evt {
>  	enum resctrl_event_id	evtid;
>  	char			*name;
> +	bool			configurable;
>  	struct list_head	list;
>  };
>  
> diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
> index e33e8d8bd796..b39e0eca1879 100644
> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> @@ -783,6 +783,13 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
>  	if (ret)
>  		return ret;
>  
> +	if (rdt_cpu_has(X86_FEATURE_BMEC)) {
> +		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL))
> +			mbm_total_event.configurable = true;
> +		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
> +			mbm_local_event.configurable = true;
> +	}
> +
>  	l3_mon_evt_init(r);
>  
>  	r->mon_capable = true;
> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> index 8a3dafc0dbf7..8342feb54a7f 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -1001,8 +1001,11 @@ static int rdt_mon_features_show(struct kernfs_open_file *of,
>  	struct rdt_resource *r = of->kn->parent->priv;
>  	struct mon_evt *mevt;
>  
> -	list_for_each_entry(mevt, &r->evt_list, list)
> +	list_for_each_entry(mevt, &r->evt_list, list) {
>  		seq_printf(seq, "%s\n", mevt->name);
> +		if (mevt->configurable)
> +			seq_printf(seq, "%s_config\n", mevt->name);
> +	}
>  
>  	return 0;
>  }
> 
> 

With subject and changelog changes:

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

Reinette