linux-kernel - Re: [PATCH v4 2/2] x86/resctrl: Read supported bandwidth sources using CPUID command

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Message-ID: <f75232ea-9e3e-1b21-4369-9a5798afbd6b@amd.com>
Date: Fri, 12 Jan 2024 15:54:06 -0600
From: "Moger, Babu" <bmoger@....com>
To: Reinette Chatre <reinette.chatre@...el.com>, babu.moger@....com,
 corbet@....net, fenghua.yu@...el.com, tglx@...utronix.de, mingo@...hat.com,
 bp@...en8.de, dave.hansen@...ux.intel.com
Cc: x86@...nel.org, hpa@...or.com, paulmck@...nel.org, rdunlap@...radead.org,
 tj@...nel.org, peterz@...radead.org, seanjc@...gle.com,
 kim.phillips@....com, jmattson@...gle.com, ilpo.jarvinen@...ux.intel.com,
 jithu.joseph@...el.com, kan.liang@...ux.intel.com, nikunj@....com,
 daniel.sneddon@...ux.intel.com, pbonzini@...hat.com,
 rick.p.edgecombe@...el.com, rppt@...nel.org,
 maciej.wieczor-retman@...el.com, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, eranian@...gle.com, peternewman@...gle.com,
 dhagiani@....com
Subject: Re: [PATCH v4 2/2] x86/resctrl: Read supported bandwidth sources
 using CPUID command

Hi Reinette,

On 1/12/2024 3:24 PM, Reinette Chatre wrote:
> Hi Babu,
>
> On 1/12/2024 12:38 PM, Moger, Babu wrote:
>> Hi  Reinette,
>>
>> On 1/12/2024 1:02 PM, Reinette Chatre wrote:
>>> Hi Babu,
>>>
>>> On 1/11/2024 1:36 PM, Babu Moger wrote:
>>>
>>>> @@ -1686,6 +1681,13 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
>>>>            return -EINVAL;
>>>>        }
>>>>    +    /* mon_config cannot be more than the supported set of events */
>>> copy&paste error? There is no mon_config in this function.
>> Yea. it should be mbm_cfg_mask.  Will fix it.
> I do not think it is correct to replace mon_config with mbm_cfg_mask. Is this comment
> not referring to the user provided value (that is checked against mbm_cfg_mask)? So
> perhaps something like:
>
> 	 /* Check value from user against supported events. */
> 	or
> 	 /* Value from user cannot be more than the supported set of events. */

This looks good. Thanks

Babu