[v3,0/9] SCMIv3.1 Powercap protocol and driver

Message

Cristian Marussi June 27, 2022, 12:30 p.m. UTC

Hi all,

this short series introduces the last missing bit of SCMIv3.1, Powercap
protocol. Along the series, there is a small refactoring around the SCMI
FastChannels handling routines so as to reuse as much as possible the
pre-existent (and tested) FastChannel code from the Perf protocol.

New SCMI FC tracing support is added too along the way.

As a last step in the series an ARM SCMI based powercap driver is added,
which takes care to expose via the Powercap framework all the SCMI Powercap
zones that have been discovered asking the SCMI platform firmware.

Basic testing has been performed against an emulated SCMI platform
supporting SCMIv3.1 Powercap protocol using powercap-utils, with the
exclusion of the FCs bits whose generalization has been only tested for
regression on a JUNO platform sporting a regular SCP/SCMI v2.10 fw.

The series is based on sudeep/for-next/scmi [1] on top of:

commit 754f04cac362 ("firmware: arm_scmi: Relax CLOCK_DESCRIBE_RATES out-of-spec checks")

Thanks,
Cristian

v2 --> v3:
- added and used some SCMI Fastchannel tracing support
- reverted logic of Kconfig to configure usage of SCMI FC
- using strscpy with new SHORT_NAME_SZ in Powercap protocol
- added devm_protocol_acquire helper

v1 --> v2:
- fixed measurements thresholds updates to trigger notification
  enable update commands
- added a bit more comments
- usig bitfield.h macros
- fixed sparse complaint about missing static on global

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git/log/?h=for-next/scmi
----



Cristian Marussi (9):
  dt-bindings: firmware: arm,scmi: Add powercap protocol
  firmware: arm_scmi: Add SCMIv3.1 Powercap protocol basic support
  firmware: arm_scmi: Generalize FastChannel support
  firmware: arm_scmi: Add SCMIv3.1 Powercap FastChannels support
  firmware: arm_scmi: Make use of FastChannels configurable
  include: trace: Add SCMI FastChannel tracing
  firmware: arm_scmi: Use FastChannel tracing
  firmware: arm_scmi: Add scmi_driver optional setup/teardown callbacks
  powercap: arm_scmi: Add SCMI Powercap based driver

 .../bindings/firmware/arm,scmi.yaml           |  10 +
 drivers/firmware/arm_scmi/Kconfig             |  13 +
 drivers/firmware/arm_scmi/Makefile            |   2 +-
 drivers/firmware/arm_scmi/bus.c               |  15 +-
 drivers/firmware/arm_scmi/driver.c            | 173 ++++
 drivers/firmware/arm_scmi/perf.c              | 225 ++---
 drivers/firmware/arm_scmi/powercap.c          | 866 ++++++++++++++++++
 drivers/firmware/arm_scmi/protocols.h         |  23 +
 drivers/powercap/Kconfig                      |  13 +
 drivers/powercap/Makefile                     |   1 +
 drivers/powercap/arm_scmi_powercap.c          | 537 +++++++++++
 include/linux/scmi_protocol.h                 | 129 +++
 include/trace/events/scmi.h                   |  25 +
 13 files changed, 1858 insertions(+), 174 deletions(-)
 create mode 100644 drivers/firmware/arm_scmi/powercap.c
 create mode 100644 drivers/powercap/arm_scmi_powercap.c