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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2025-09-03 12:11:54 -0700 |
|---|---|---|
| committer | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2025-09-04 15:52:33 +0300 |
| commit | a191224186ec16a4cb1775b2a647ea91f5c139e1 (patch) | |
| tree | e4d9097e7ca396eef77663fa859ff7fd9d9803e4 /rust/helpers/helpers.c | |
| parent | a0d6959c345d89d811288a718e3f6b145dcadc8c (diff) | |
platform/x86/intel-uncore-freq: Present unique domain ID per package
In partitioned systems, the domain ID is unique in the partition and a
package can have multiple partitions.
Some user-space tools, such as turbostat, assume the domain ID is unique
per package. These tools map CPU power domains, which are unique to a
package. However, this approach does not work in partitioned systems.
There is no architectural definition of "partition" to present to user
space.
To support these tools, set the domain_id to be unique per package. For
compute die IDs, uniqueness can be achieved using the platform info
cdie_mask, mirroring the behavior observed in non-partitioned systems.
For IO dies, which lack a direct CPU relationship, any unique logical
ID can be assigned. Here domain IDs for IO dies are configured after all
compute domain IDs. During the probe, keep the index of the next IO
domain ID after the last IO domain ID of the current partition. Since
CPU packages are symmetric, partition information is same for all
packages.
The Intel Speed Select driver has already implemented a similar change
to make the domain ID unique, with compute dies listed first, followed
by I/O dies.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20250903191154.1081159-1-srinivas.pandruvada@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Diffstat (limited to 'rust/helpers/helpers.c')
0 files changed, 0 insertions, 0 deletions
