linux-kernel - Re: [PATCH v8 8/8] x86/resctrl: Display hardware ids of resource groups

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Message-ID: <4019a73a-8478-f18b-7f34-b8d838dfc7fe@intel.com>
Date:   Tue, 29 Aug 2023 13:14:17 -0700
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 v8 8/8] x86/resctrl: Display hardware ids of resource
 groups

Hi Babu,

On 8/21/2023 4:30 PM, Babu Moger wrote:

...

> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 2fae6d9e24d3..3fa32c1c2677 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -296,9 +296,15 @@ struct rdtgroup {
>   *	--> RFTYPE_BASE (Files common for both MON and CTRL groups)
>   *	    Files: cpus, cpus_list, tasks
>   *
> + *		--> RFTYPE_DEBUG (Files to help resctrl debugging)
> + *		    File: mon_hw_id
> + *

This does not look right. I think mon_hw_id should have RFTYPE_MON
(more below).

>   *		--> RFTYPE_CTRL (Files only for CTRL group)
>   *		    Files: mode, schemata, size
>   *
> + *			--> RFTYPE_DEBUG (Files to help resctrl debugging)
> + *			    File: ctrl_hw_id
> + *
>   */
>  #define RFTYPE_INFO			BIT(0)
>  #define RFTYPE_BASE			BIT(1)
> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> index 94bd69f9964c..e0c2479acf49 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -776,6 +776,38 @@ static int rdtgroup_tasks_show(struct kernfs_open_file *of,
>  	return ret;
>  }
>  
> +static int rdtgroup_closid_show(struct kernfs_open_file *of,
> +				struct seq_file *s, void *v)
> +{
> +	struct rdtgroup *rdtgrp;
> +	int ret = 0;
> +
> +	rdtgrp = rdtgroup_kn_lock_live(of->kn);
> +	if (rdtgrp)
> +		seq_printf(s, "%u\n", rdtgrp->closid);
> +	else
> +		ret = -ENOENT;
> +	rdtgroup_kn_unlock(of->kn);
> +
> +	return ret;
> +}
> +
> +static int rdtgroup_rmid_show(struct kernfs_open_file *of,
> +			      struct seq_file *s, void *v)
> +{
> +	struct rdtgroup *rdtgrp;
> +	int ret = 0;
> +
> +	rdtgrp = rdtgroup_kn_lock_live(of->kn);
> +	if (rdtgrp)
> +		seq_printf(s, "%u\n", rdtgrp->mon.rmid);
> +	else
> +		ret = -ENOENT;
> +	rdtgroup_kn_unlock(of->kn);
> +
> +	return ret;
> +}
> +
>  #ifdef CONFIG_PROC_CPU_RESCTRL
>  
>  /*
> @@ -1837,6 +1869,13 @@ static struct rftype res_common_files[] = {
>  		.seq_show	= rdtgroup_tasks_show,
>  		.fflags		= RFTYPE_BASE,
>  	},
> +	{
> +		.name		= "mon_hw_id",
> +		.mode		= 0444,
> +		.kf_ops		= &rdtgroup_kf_single_ops,
> +		.seq_show	= rdtgroup_rmid_show,
> +		.fflags		= RFTYPE_BASE | RFTYPE_DEBUG,

I missed this earlier but I think this also needs a RFTYPE_MON.
Perhaps patch 3 can introduce a new RFTYPE_MON_BASE to not
have the flags of the two new files look too different?

> +	},
>  	{
>  		.name		= "schemata",
>  		.mode		= 0644,
> @@ -1860,6 +1899,13 @@ static struct rftype res_common_files[] = {
>  		.seq_show	= rdtgroup_size_show,
>  		.fflags		= RFTYPE_CTRL_BASE,
>  	},
> +	{
> +		.name		= "ctrl_hw_id",
> +		.mode		= 0444,
> +		.kf_ops		= &rdtgroup_kf_single_ops,
> +		.seq_show	= rdtgroup_closid_show,
> +		.fflags		= RFTYPE_CTRL_BASE | RFTYPE_DEBUG,
> +	},
>  
>  };
>  

Reinette