linux-kernel - Re: [PATCH v1 30/31] x86/resctrl: Move the filesystem bits to headers visible to fs/resctrl

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Date: Mon, 8 Apr 2024 20:42:00 -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 30/31] x86/resctrl: Move the filesystem bits to headers
 visible to fs/resctrl

Hi James,

On 3/21/2024 9:51 AM, James Morse wrote:
..
> diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
> index 4788bd95dac6..fe0b10b589c0 100644
> --- a/include/linux/resctrl_types.h
> +++ b/include/linux/resctrl_types.h
> @@ -7,6 +7,36 @@
>  #ifndef __LINUX_RESCTRL_TYPES_H
>  #define __LINUX_RESCTRL_TYPES_H
>  
> +#define CQM_LIMBOCHECK_INTERVAL	1000
> +
> +#define MBM_CNTR_WIDTH_BASE		24
> +#define MBM_OVERFLOW_INTERVAL		1000
> +#define MAX_MBA_BW			100u
> +#define MBA_IS_LINEAR			0x4
> +
> +/* rdtgroup.flags */
> +#define	RDT_DELETED		1
> +
> +/* rftype.flags */
> +#define RFTYPE_FLAGS_CPUS_LIST	1
> +
> +/*
> + * Define the file type flags for base and info directories.
> + */
> +#define RFTYPE_INFO			BIT(0)
> +#define RFTYPE_BASE			BIT(1)
> +#define RFTYPE_CTRL			BIT(4)
> +#define RFTYPE_MON			BIT(5)
> +#define RFTYPE_TOP			BIT(6)
> +#define RFTYPE_RES_CACHE		BIT(8)
> +#define RFTYPE_RES_MB			BIT(9)
> +#define RFTYPE_DEBUG			BIT(10)
> +#define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)
> +#define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)
> +#define RFTYPE_TOP_INFO			(RFTYPE_INFO | RFTYPE_TOP)
> +#define RFTYPE_CTRL_BASE		(RFTYPE_BASE | RFTYPE_CTRL)
> +#define RFTYPE_MON_BASE			(RFTYPE_BASE | RFTYPE_MON)
> +
>  /* Reads to Local DRAM Memory */
>  #define READS_TO_LOCAL_MEM		BIT(0)
>  

Not all these new seem to belong in this file. Could you please confirm?

For example:
Earlier in series it was mentioned that struct rdtgroup is private to the
fs so having RDT_DELETED is unexpected as it implies access to struct rdtgroup.

CQM_LIMBOCHECK_INTERVAL seems private to the fs code, so too
RFTYPE_FLAGS_CPUS_LIST.

Reinette