linux-kernel - Re: [PATCH v4 01/24] x86/resctrl: Split struct rdt

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Date:   Tue, 15 Jun 2021 11:07:26 -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,
        Jamie Iles <jamie@...iainc.com>,
        D Scott Phillips OS <scott@...amperecomputing.com>,
        lcherian@...vell.com
Subject: Re: [PATCH v4 01/24] x86/resctrl: Split struct rdt_resource

Hi James,

On 6/14/2021 1:09 PM, James Morse wrote:
> resctrl is the defacto Linux ABI for SoC resource partitioning features.
> 
> To support it on another architecture, it needs to be abstracted from
> the features provided by Intel RDT and AMD PQoS, and moved to /fs/.
> struct rdt_resource contains a mix of architecture private details
> and properties of the filesystem interface user-space users.

"user-space users" -> "user-space uses" ?

...

> +struct rdt_parse_data;
> +
> +/**
> + * struct rdt_resource - attributes of a resctrl resource
> + * @rid:		The index of the resource
> + * @alloc_enabled:	Is allocation enabled on this machine
> + * @mon_enabled:	Is monitoring enabled for this feature
> + * @alloc_capable:	Is allocation available on this machine
> + * @mon_capable:	Is monitor feature available on this machine
> + * @num_rmid:		Number of RMIDs available.
> + * @cache_level:	Which cache level defines scope of this resource
> + * @cache:		If the component has cache controls, their properties.
> + * @membw:		If the component has bandwidth controls, their properties.
> + * @domains:		All domains for this resource
> + * @name:		Name to use in "schemata" file.
> + * @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
> + *

Unexpected space here.

> + * @evt_list:		List of monitoring events
> + * @fflags:		flags to choose base and info files
> + */
> +struct rdt_resource {
> +	int			rid;
> +	bool			alloc_enabled;
> +	bool			mon_enabled;
> +	bool			alloc_capable;
> +	bool			mon_capable;
> +	int			num_rmid;
> +	int			cache_level;
> +	struct resctrl_cache	cache;
> +	struct resctrl_membw	membw;
> +	struct list_head	domains;
> +	char			*name;
> +	int			data_width;
> +	u32			default_ctrl;
> +	const char		*format_str;
> +	int			(*parse_ctrlval)(struct rdt_parse_data *data,
> +						 struct rdt_resource *r,
> +						 struct rdt_domain *d);
> +	struct list_head	evt_list;
> +	unsigned long		fflags;
> +
> +};
> +
>   #endif /* _RESCTRL_H */
> 

Reinette