Re: [PATCH] ACPI/PPTT: Handle architecturally unknown cache types

[Jeremy Linton]

Hi,


On 09/12/2018 09:41 AM, Jeffrey Hugo wrote:
> The HW designers have indicated that there is no sane way to provide 
> sets/ways information to software, even on an informational basis (ie 
> not for cache maintenance, but for performance optimizations). Therefore 
> the firmware will not provide this information because it will be wrong.
>
> So, therefore, we should still be able to tell the user that a cache 
> exists at the relevant level, and what size it is. On the concerned 
> system, we cannot do that currently.

Ok, so set the fields to zero in firmware node, and mark them valid.

That logically says that there isn't any set/way information for the 
cache (which implies direct mapped).