linux-kernel - Re: [PATCH v11 19/30] x86/resctrl: Move pseudo lock prototypes to include/linux/resctrl.h

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Message-ID: <8ca4bf27-b90d-448f-8d9b-56a1069a134c@nvidia.com>
Date: Wed, 14 May 2025 18:05:00 -0700
From: Fenghua Yu <fenghuay@...dia.com>
To: James Morse <james.morse@....com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Cc: Reinette Chatre <reinette.chatre@...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>, Koba Ko <kobak@...dia.com>,
 Shanker Donthineni <sdonthineni@...dia.com>,
 Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v11 19/30] x86/resctrl: Move pseudo lock prototypes to
 include/linux/resctrl.h


On 5/13/25 10:15, James Morse wrote:
> The resctrl pseudo-lock feature allows an architecture to allocate data
> into particular cache portions, which are then treated as reserved to
> avoid that data ever being evicted. Setting this up is deeply architecture
> specific as it involves disabling prefetchers etc. It is not possible
> to support this kind of feature on arm64. Risc-V is assumed to be the
> same.
>
> The prototypes for the architecture code were added to x86's asm/resctrl.h,
> with other architectures able to provide stubs for their architecture. This
> forces other architectures to provide identical stubs.
>
> Move the prototypes and stubs to linux/resctrl.h, and switch between them
> using the existing Kconfig symbol.
>
> Signed-off-by: James Morse <james.morse@....com>
> Tested-by: Babu Moger <babu.moger@....com>
> Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reviewed-by: Fenghua Yu <fenghuay@...dia.com>

Thanks.

-Fenghua