linux-kernel - [PATCH 0/8] Add support for SCMIv4.0 Powercap Extensions

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Message-ID: <20250813114609.1305571-1-cristian.marussi@arm.com>
Date: Wed, 13 Aug 2025 12:46:01 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	arm-scmi@...r.kernel.org,
	linux-pm@...r.kernel.org
Cc: sudeep.holla@....com,
	james.quinlan@...adcom.com,
	f.fainelli@...il.com,
	vincent.guittot@...aro.org,
	etienne.carriere@...com,
	peng.fan@....nxp.com,
	michal.simek@....com,
	quic_sibis@...cinc.com,
	dan.carpenter@...aro.org,
	d-gole@...com,
	souvik.chakravarty@....com,
	Cristian Marussi <cristian.marussi@....com>
Subject: [PATCH 0/8] Add support for SCMIv4.0 Powercap Extensions

Hi all,

SCMIv4.0 [1] introduces some new features and commands into the Powercap
protocol. In a nutshell, such protocol changes add support for:

 - setting multiple powercap limit/interval constraints for each SCMI
   powercap domain which supports multiple Concurrent Power Limit
 - enabling more Powercap commands to use Fastchannels mechanism
 - adding multiple constraints support to the existing notifications

After a bit of needed updates in the SCMI core this series adds:

- support for the idea of optional multiple Concurrent Power Limit (CPLs)
- support for the new FCs
- support for extended notifications
- enable usage of such multiple constraint in the ARM SCMI Powercap driver

Note that the public SCMIv4.0 spec at [1] is currently still ALPHA0, so
this series could anyway need some minor rework along the way and
definitely will need to wait for a final public release before being
possibly merged.

Tested in a mocked setup implementing the new protocol extensions.
Based on v6.17-rc1.

Thanks,
Cristian

[1]: https://developer.arm.com/documentation/den0056/f/?lang=en


Cristian Marussi (8):
  firmware: arm_scmi: Add an optional custom parameter to fastchannel
    helpers
  firmware: arm_scmi: Add bound iterators support
  firmware: arm_scmi: Refactor powercap domain layout
  firmware: arm_scmi: Add SCMIv4.0 Powercap basic support
  firmware: arm_scmi: Add SCMIv4.0 Powercap FCs support
  firmware: arm_scmi: Add SCMIV4.0 Powercap notifications support
  include: trace: Add new parameter to trace_scmi_fc_call
  powercap: arm_scmi: Enable multiple constraints support

 drivers/firmware/arm_scmi/driver.c    |  33 +-
 drivers/firmware/arm_scmi/perf.c      |  16 +-
 drivers/firmware/arm_scmi/powercap.c  | 843 ++++++++++++++++++++------
 drivers/firmware/arm_scmi/protocols.h |   8 +-
 drivers/powercap/arm_scmi_powercap.c  |  54 +-
 include/linux/scmi_protocol.h         |  78 ++-
 include/trace/events/scmi.h           |  10 +-
 7 files changed, 777 insertions(+), 265 deletions(-)

-- 
2.47.0