Re: [PATCH v3 06/12] fs/resctrl: Initialize the global kernel-mode policy at subsystem init

[Babu Moger <babu.moger@amd.com>]

Hi Reinette,

On 6/22/26 11:21, Reinette Chatre wrote:
> Hi Babu,
> 
> On 6/18/26 10:14 AM, Babu Moger wrote:
>> On 6/16/26 18:36, Reinette Chatre wrote:
>>> On 4/30/26 4:24 PM, Babu Moger wrote:
>   
>>>
>>>>     - calls resctrl_arch_get_kmode_support() so each architecture ORs
>>>>       BIT(<mode>) into kmode for the policies its hardware supports
>>>>       (on x86, AMD PLZA contributes the two global-assign modes).
>>>>
>>>> resctrl_kmode_init() runs from resctrl_init() once the default group
>>>
>>> resctrl_kmode_init() can be dropped after changes described in response
>>> to previous patch. Apart from no longer being necessary I also find that
>>> having the kernel mode fully initialized *before* the hotplug handlers run
>>> to be simpler.
>>
>> That means resctrl_set_kmode_support() will be called from the architecture layer, likely from core.c within get_rdt_alloc_resources().
>>
>> The resctrl_set_kmode_support() handler would need to initialize both the default mode and all supported modes.
> 
> I see this differently. Since resctrl_set_kmode_support() is optional for an architecture
> resctrl fs can just statically initialize the defaults. resctrl_set_kmode_support() would
> expand the defaults to also accommodate what the architecture supports.
>
Yes. We can do that.

thanks
Babu