linux-kernel - Re: [PATCH v5 04/40] x86/resctrl: Use schema type to determine how to parse schema values

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Message-ID: <7f7db029-2e94-4cba-9019-70810ad43b48@intel.com>
Date: Wed, 23 Oct 2024 14:14:11 -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>, Shaopeng Tan
	<tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v5 04/40] x86/resctrl: Use schema type to determine how to
 parse schema values

Hi James,

On 10/4/24 11:03 AM, James Morse wrote:
> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> index 2abe17574407..11153271cbdc 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -2201,7 +2201,7 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
>  	}
>  
>  	for_each_mon_capable_rdt_resource(r) {
> -		fflags =  fflags_from_resource(r) | RFTYPE_MON_INFO;
> +		fflags = fflags_from_resource(r) | RFTYPE_MON_INFO;
>  		sprintf(name, "%s_MON", r->name);
>  		ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
>  		if (ret)

Stray hunk.

> diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
> index 496ddcaa4ecf..54ec87339038 100644
> --- a/include/linux/resctrl.h
> +++ b/include/linux/resctrl.h
> @@ -183,7 +183,6 @@ struct resctrl_membw {
>  	u32				*mb_map;
>  };
>  
> -struct rdt_parse_data;
>  struct resctrl_schema;
>  
>  enum resctrl_scope {
> @@ -192,6 +191,17 @@ enum resctrl_scope {
>  	RESCTRL_L3_NODE,
>  };
>  
> +/**
> + * enum resctrl_schema_fmt - The format user-space provides for a schema.
> + * @RESCTRL_SCHEMA_BITMAP:	The schema is a bitmap in hex.
> + * @RESCTRL_SCHEMA_RANGE:	The schema is a number, either a percentage
> + *				or a MBps value.

The description of RESCTRL_SCHEMA_RANGE appears to aim to be specific. Considering this
it should also include the "multiples of one eighth GB/s" input option used on
AMD systems.
The software controller is the only user of actual bandwidth and for its
use it should be "MiBps".


> + */
> +enum resctrl_schema_fmt {
> +	RESCTRL_SCHEMA_BITMAP,
> +	RESCTRL_SCHEMA_RANGE,
> +};
> +
>  /**
>   * struct rdt_resource - attributes of a resctrl resource
>   * @rid:		The index of the resource
> @@ -208,7 +218,7 @@ enum resctrl_scope {
>   * @data_width:		Character width of data when displaying
>   * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
>   * @format_str:		Per resource format string to show domain value
> - * @parse_ctrlval:	Per resource function pointer to parse control values
> + * @schema_fmt:	Which format string and parser is used for this schema.

Please fix alignment.

>   * @evt_list:		List of monitoring events
>   * @cdp_capable:	Is the CDP feature available on this resource
>   */
> @@ -227,9 +237,7 @@ struct rdt_resource {
>  	int			data_width;
>  	u32			default_ctrl;
>  	const char		*format_str;
> -	int			(*parse_ctrlval)(struct rdt_parse_data *data,
> -						 struct resctrl_schema *s,
> -						 struct rdt_ctrl_domain *d);
> +	enum resctrl_schema_fmt	schema_fmt;
>  	struct list_head	evt_list;
>  	bool			cdp_capable;
>  };

Reinette