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docs: driver-api/thermal/intel_dptf: Add new workload type hint 

Add documentation for longer term classification of workload type for
power or performance.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20251118223620.554798-1-srinivas.pandruvada@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Srinivas Pandruvada 2025-11-18 14:36:19 -08:00 committed by Rafael J. Wysocki
parent 3402bc010d
commit 8538e7ee09
1 changed files with 23 additions and 0 deletions
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Documentation/driver-api/thermal/intel_dptf.rst
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@ -409,3 +409,26 @@ based on the processor generation.
Limit 1 from being exhausted. Limit 1 from being exhausted.
4 – Unknown: Can't classify. 4 – Unknown: Can't classify.
On processors starting from Panther Lake additional hints are provided.
The hardware analyzes workload residencies over an extended period to
determine whether the workload classification tends toward idle/battery
life states or sustained/performance states. Based on this long-term
analysis, it classifies:
Power Classification: If the workload exhibits more idle or battery life
residencies, it is classified as "power".
Performance Classification: If the workload exhibits more sustained or
performance residencies, it is classified as "performance".
This approach enables applications to ignore short-term workload
fluctuations and instead respond to longer-term power vs. performance
trends.
Residency thresholds for this classification are CPU generation-specific.
Classification is reported via bit 4 of the workload_type_index:
Bit 4 = 1: Power classification
Bit 4 = 0: Performance classification