linux-kernel - Re: [PATCH v6 13/42] x86/resctrl: Move resctrl types to a separate header

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Message-ID: <60a1043d-014e-408c-a9a6-690f610ac609@arm.com>
Date: Fri, 28 Feb 2025 19:51:14 +0000
From: James Morse <james.morse@....com>
To: Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Cc: 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>, Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH v6 13/42] x86/resctrl: Move resctrl types to a separate
 header

Hi Reinette,

On 19/02/2025 23:29, Reinette Chatre wrote:
> On 2/7/25 10:17 AM, James Morse wrote:
>> When resctrl is fully factored into core and per-arch code, each arch
>> will need to use some resctrl common definitions in order to define its
>> own specializations and helpers.  Following conventional practice, it
>> would be desirable to put the dependent arch definitions in an
>> <asm/resctrl.h> header that is included by the common <linux/resctrl.h>
>> header.  However, this can make it awkward to avoid a circular
>> dependency between <linux/resctrl.h> and the arch header.
>>
>> To avoid such dependencies, move the affected common types and
>> constants into a new header that does not need to depend on
>> <linux/resctrl.h> or on the arch headers.
>>
>> The same logic applies to the monitor-configuration defines, move these
>> too.
>>
>> Some kind of enumeration for events is needed between the filesystem
>> and architecture code. Take the x86 definition as its convenient for
>> x86.
>>
>> The definition of enum resctrl_event_id is needed to allow the
>> architecture code to define resctrl_arch_mon_ctx_alloc() and
>> resctrl_arch_mon_ctx_free().
>>
>> The definition of enum resctrl_res_level is needed to allow the
>> architecture code to define resctrl_arch_set_cdp_enabled() and
>> resctrl_arch_get_cdp_enabled().
>>
>> The bits for mbm_local_bytes_config et al are ABI, and must be the same
>> on all architectures. These are documented in
>> Documentation/arch/x86/resctrl.rst
>>
>> The maintainers entry for these headers was missed when resctrl.h was
>> created. Add a wildcard entry to match both resctrl.h and
>> resctrl_types.h.

>> diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
>> new file mode 100644
>> index 000000000000..51c51a1aabfb
>> --- /dev/null
>> +++ b/include/linux/resctrl_types.h
>> @@ -0,0 +1,54 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Copyright (C) 2024 Arm Ltd.
> 
> Please note year.

I've changed it.


[...]

> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>


Thanks!

James