Hi Ben,

On 14/07/2025 12:42, Ben Horgan wrote:

On 7/11/25 19:36, James Morse wrote:

quoted

The MPAM table identifies caches by id. The MPAM driver also wants to know
the cache level to determine if the platform is of the shape that can be
managed via resctrl. Cacheinfo has this information, but only for CPUs that
are online.

Waiting for all CPUs to come online is a problem for platforms where
CPUs are brought online late by user-space.

Add a helper that walks every possible cache, until it finds the one
identified by cache-id, then return the level.

acpi_count_levels() expects its levels parameter to be initialised to
zero as it passes it to acpi_find_cache_level() as starting_level.
The existing callers do this. Document it.

This paragraph is stale. You dealt with this in the previous commit.

Fixed, thanks.

James