linux-kernel - Re: [PATCH v1 17/31] x86/resctrl: Move mbm_cfg_mask to struct rdt

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Date: Mon, 8 Apr 2024 20:21:24 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: James Morse <james.morse@....com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>
CC: Fenghua Yu <fenghua.yu@...el.com>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, H Peter Anvin
	<hpa@...or.com>, Babu Moger <Babu.Moger@....com>,
	<shameerali.kolothum.thodi@...wei.com>, D Scott Phillips OS
	<scott@...amperecomputing.com>, <carl@...amperecomputing.com>,
	<lcherian@...vell.com>, <bobo.shaobowang@...wei.com>,
	<tan.shaopeng@...itsu.com>, <baolin.wang@...ux.alibaba.com>, Jamie Iles
	<quic_jiles@...cinc.com>, Xin Hao <xhao@...ux.alibaba.com>,
	<peternewman@...gle.com>, <dfustini@...libre.com>, <amitsinght@...vell.com>,
	David Hildenbrand <david@...hat.com>, Rex Nie <rex.nie@...uarmicro.com>, Dave
 Martin <dave.martin@....com>
Subject: Re: [PATCH v1 17/31] x86/resctrl: Move mbm_cfg_mask to struct
 rdt_resource

Hi James,

On 3/21/2024 9:50 AM, James Morse wrote:
> The mbm_cfg_mask field lists the bits that user-space can set when
> configuring an event. This value is output via the last_cmd_status
> file.
> 
> Once the filesystem parts of resctrl are moved to live in /fs/, the
> struct rdt_hw_resource is inaccessible to the filesystem code. Because
> this value is output to user-space, it has to be accessible to the
> filesystem code.
> 
> Move it to struct rdt_resource.
> 
> Signed-off-by: James Morse <james.morse@....com>

..

> diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
> index 975b80102fbe..8a7367d1ce45 100644
> --- a/include/linux/resctrl.h
> +++ b/include/linux/resctrl.h
> @@ -140,6 +140,8 @@ struct resctrl_membw {
>   * @format_str:		Per resource format string to show domain value
>   * @evt_list:		List of monitoring events
>   * @fflags:		flags to choose base and info files
> + * @mbm_cfg_mask:	Bandwidth sources that can be tracked when Bandwidth
> + *			Monitoring Event Configuration (BMEC) is supported.

BMEC is an AMD term. If MPAM is planning to use this member then this comment
should be made generic.

>   * @cdp_capable:	Is the CDP feature available on this resource
>   */
>  struct rdt_resource {
> @@ -157,6 +159,7 @@ struct rdt_resource {
>  	const char		*format_str;
>  	struct list_head	evt_list;
>  	unsigned long		fflags;
> +	unsigned int		mbm_cfg_mask;
>  	bool			cdp_capable;
>  };
>  

Reinette