netdev - [PATCH 0/3] thermal/netlink/intel_hfi: Enable HFI feature only when required

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Message-Id: <20240131120535.933424-1-stanislaw.gruszka@linux.intel.com>
Date: Wed, 31 Jan 2024 13:05:32 +0100
From: Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>
To: linux-pm@...r.kernel.org
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Subject: [PATCH 0/3] thermal/netlink/intel_hfi: Enable HFI feature only when required

The patchset introduces a netlink notification, which together with
netlink_has_listners() check, allow drivers to send netlink multicast
events based on the presence of actual user-space consumers.
This functionality optimizes resource usage by allowing disabling
of features when not needed.

Then implement the notification mechanism in the intel_hif driver,
it is utilized to disable the Hardware Feedback Interface (HFI)
dynamically. By implementing a netlink notify callback, the driver
can now enable or disable the HFI based on actual demand, particularly
when user-space applications like intel-speed-select or Intel Low Power
daemon utilize events related to performance and energy efficiency
capabilities.

On machines where Intel HFI is present, but there are no user-space
components installed, we can save tons of CPU cycles.

Stanislaw Gruszka (3):
  netlink: Add notifier when changing netlink socket membership
  thermal: netlink: Export thermal_group_has_listeners()
  thermal: intel: hfi: Enable interface only when required

 drivers/thermal/intel/intel_hfi.c | 82 +++++++++++++++++++++++++++----
 drivers/thermal/thermal_netlink.c |  7 +--
 drivers/thermal/thermal_netlink.h | 11 +++++
 include/linux/notifier.h          |  1 +
 net/netlink/af_netlink.c          |  6 +++
 5 files changed, 92 insertions(+), 15 deletions(-)

-- 
2.34.1