linux-kernel - Re: [PATCH v9 08/10] fs/resctrl: Modify rdt_parse

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Message-ID: <876f1d86-d83a-4e13-ab82-b61b50d6a3b7@amd.com>
Date: Fri, 19 Sep 2025 14:49:52 -0500
From: "Moger, Babu" <bmoger@....com>
To: Reinette Chatre <reinette.chatre@...el.com>,
 Babu Moger <babu.moger@....com>, corbet@....net, tony.luck@...el.com,
 Dave.Martin@....com, james.morse@....com, tglx@...utronix.de,
 mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com
Cc: x86@...nel.org, hpa@...or.com, kas@...nel.org,
 rick.p.edgecombe@...el.com, akpm@...ux-foundation.org, paulmck@...nel.org,
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Subject: Re: [PATCH v9 08/10] fs/resctrl: Modify rdt_parse_data to pass mode
 and CLOSID

Hi Reinette,

On 9/18/2025 12:44 AM, Reinette Chatre wrote:
> Hi Babu,
> 
> nit:
> Subject: fs/resctrl: Modify struct rdt_parse_data to pass mode and CLOSID

sure.

> 
> On 9/2/25 3:41 PM, Babu Moger wrote:
>> parse_cbm() require resource group mode and CLOSID to validate the Capacity
>> Bit Mask (CBM). It is passed via struct rdtgroup in struct rdt_parse_data.
>>
>> The io_alloc feature also uses CBMs to indicate which portions of cache are
>> allocated for I/O traffic. The CBMs are provided by user space and need to
>> be validated the same as CBMs provided for general (CPU) cache allocation.
>> parse_cbm() cannot be used as-is since io_alloc does not have rdtgroup
>> context.
>>
>> Pass the resource group mode and CLOSID directly to parse_cbm() via struct
>> rdt_parse_data, instead of through the rdtgroup struct, to facilitate
>> calling parse_cbm() to verify the CBM of the io_alloc feature.
>>
>> Signed-off-by: Babu Moger <babu.moger@....com>
>> ---
> 
> With Subject change:
> 
> | Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
> 

Thanks
Babu