linux-kernel - [PATCH for 6.19 0/4] Revise the EM YNL spec to be clearer

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Message-ID: <20251225040104.982704-1-changwoo@igalia.com>
Date: Thu, 25 Dec 2025 13:01:00 +0900
From: Changwoo Min <changwoo@...lia.com>
To: lukasz.luba@....com,
	rafael@...nel.org,
	donald.hunter@...il.com,
	kuba@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	horms@...nel.org,
	lenb@...nel.org,
	pavel@...nel.org,
	changwoo@...lia.com
Cc: kernel-dev@...lia.com,
	linux-pm@...r.kernel.org,
	netdev@...r.kernel.org,
	sched-ext@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH for 6.19 0/4] Revise the EM YNL spec to be clearer

This patch set addresses all the concerns raised at [1] to make the EM YNL spec
clearer. It includes the following changes:

- Fix the lint errors (1/4). 
- Rename em.yaml to dev-energymodel.yaml (2/4).  “dev-energymodel” was used
  instead of “device-energy-model”, which was originally proposed [2], because
  the netlink protocol name cannot exceed GENL_NAMSIZ(16). In addition, docs
  strings and flags attributes were added.
- Change cpus' type from string to u64 array of CPU ids (3/4).
- Add dump to get-perf-domains in the EM YNL spec (4/4). A user can fetch
  either information about a specific performance domain with do or information
  about all performance domains with dump. 

This can be tested using the tool, tools/net/ynl/pyynl/cli.py, for example,
with the following commands:

  $> tools/net/ynl/pyynl/cli.py \
     --spec Documentation/netlink/specs/dev-energymodel.yaml \
     --dump get-perf-domains
  $> tools/net/ynl/pyynl/cli.py \
     --spec Documentation/netlink/specs/dev-energymodel.yaml \
     --do get-perf-domains --json '{"perf-domain-id": 0}'
  $> tools/net/ynl/pyynl/cli.py \
     --spec Documentation/netlink/specs/dev-energymodel.yaml \
     --do get-perf-table --json '{"perf-domain-id": 0}'
  $> tools/net/ynl/pyynl/cli.py \
     --spec Documentation/netlink/specs/dev-energymodel.yaml \
     --subscribe event  --sleep 10

[1] https://lore.kernel.org/lkml/CAD4GDZy-aeWsiY=-ATr+Y4PzhMX71DFd_mmdMk4rxn3YG8U5GA@mail.gmail.com/
[2] https://lore.kernel.org/lkml/CAJZ5v0gpYQwC=1piaX-PNoyeoYJ7uw=DtAGdTVEXAsi4bnSdbA@mail.gmail.com/

Changwoo Min (4):
  PM: EM: Fix yamllint warnings in the EM YNL spec
  PM: EM: Rename em.yaml to dev-energymodel.yaml
  PM: EM: Change cpus' type from string to u64 array in the EM YNL spec
  PM: EM: Add dump to get-perf-domains in the EM YNL spec

 .../netlink/specs/dev-energymodel.yaml        | 188 ++++++++++++++++
 Documentation/netlink/specs/em.yaml           | 113 ----------
 MAINTAINERS                                   |   8 +-
 include/uapi/linux/dev_energymodel.h          |  90 ++++++++
 include/uapi/linux/energy_model.h             |  63 ------
 kernel/power/em_netlink.c                     | 207 ++++++++++++------
 kernel/power/em_netlink_autogen.c             |  58 +++--
 kernel/power/em_netlink_autogen.h             |  22 +-
 8 files changed, 472 insertions(+), 277 deletions(-)
 create mode 100644 Documentation/netlink/specs/dev-energymodel.yaml
 delete mode 100644 Documentation/netlink/specs/em.yaml
 create mode 100644 include/uapi/linux/dev_energymodel.h
 delete mode 100644 include/uapi/linux/energy_model.h

-- 
2.52.0