[PATCH v2 0/2] sched/cpufreq: fix schedutil's boost frequency handling

[Ananthu C V]

Schedutil's ability to reach boost frequencies depends on two values
being correct: policy max, which caps the resolved target frequency,
and the per-CPU capacity frequency reference, which anchors the
utilization-to-frequency mapping.

This series fixes a few gaps in how these values are maintained across
boost transitions:

The per-CPU capacity frequency reference is set once at policy
creation and never updated when boost is enabled afterwards, leaving
schedutil unable to target boost frequencies even at full utilization.
Track the max available (boost inclusive) frequency before policy
comes online and use it to seed the capacity_freq_ref value, allowing
schedutil to utilize the boost frequency values when boost is enabled
later.

The generic boost callback only raises cpuinfo max, never lowers it.
Once boost is enabled, disabling it leaves cpuinfo max pinned at the
boost ceiling, keeping policy max stuck there too. Also track the max
available non-boost frequency and use the newly tracked max values to
control boost frequencies when a frequency table is available, allowing
the frequency to drop back to non boost values on boost disable. In
the absense of a frequency table, the handling will fall back to using
cpuinfo->max_freq, preserving the current behaviour.

Logs below for clear context:
Intermediate values from the time_in_state output and logs from bench
runs are truncated for brevity.

Before fix
----------

boost  policy0  policy12  policy6

0

4454400

4723200

4723200

355200 36958
4454400 650
4588800 0
4723200 0

After fix
---------

boost  policy0  policy12  policy6

0

4454400

4723200

4454400

0

355200 40147
4454400 79
4588800 0
4723200 0

355200 44834
4454400 93
4588800 25
4723200 569

Signed-off-by: Ananthu C V <ananthu.cv@xxxxxxxxxxxxxxxx>
---
Ananthu C V (2):
      arch_topology: seed capacity_freq_ref with boost-aware max freq
      cpufreq: fix schedutil not returning to non-boost freq when boost is disabled

 drivers/base/arch_topology.c |  3 ++-
 drivers/cpufreq/cpufreq.c    | 14 +++++++++++++-
 drivers/cpufreq/freq_table.c | 11 +++++++++++
 include/linux/cpufreq.h      |  2 ++
 4 files changed, 28 insertions(+), 2 deletions(-)
---
base-commit: 32b6ef9a5d0eca44f9cd91f52f4faa89f145a0de
change-id: 20260804-schedutil-boost-frequency-handling-8e6bf2387a4a

Best regards,
-- 
Ananthu C V <ananthu.cv@xxxxxxxxxxxxxxxx>