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Wysocki" , Srinivas Pandruvada , Ricardo Neri , Daniel Lezcano Subject: [PATCH v4 0/3] thermal/netlink/intel_hfi: Enable HFI feature only when required Date: Fri, 23 Feb 2024 16:59:39 +0100 Message-Id: <20240223155942.60813-1-stanislaw.gruszka@linux.intel.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The patchset is based on https://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux.git for-thermal-genetlink-family-bind-unbind-callbacks and implement genetlink family bind/unbind callbacks in thermal-netlink and add notifications to thermal subdrivers. Those willh 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 thermal genl 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. Changes v4 -> v5: - Fix hif vs. hfi in the changelog - Rename thermal_gnl_chain - Add new patch with rename of thermal_gnl_family - Fix syscore concurrency comment - Remove unneeded hfi_instance variable - Rename hfi_do_enable/disable - Avoid multiple enabling - Add comment about registering for events before they can be generated - Rename hfi_thermal_clients_num since later there will be KVM clients Changes v3 -> v4: - Add 'static inline' in patch2 Changes v2 -> v3: - Fix unused variable compilation warning - Add missed Suggested by tag to patch2 Changes v1 -> v2: - Rewrite using netlink_bind/netlink_unbind callbacks. - Minor changelog tweaks. - Add missing check in intel hfi syscore resume (had it on my testing, but somehow missed in post). - Do not use netlink_has_listeners() any longer, use custom counter instead. To keep using netlink_has_listners() would be required to rearrange netlink_setsockopt() and possibly netlink_bind() functions, to call nlk->netlink_bind() after listeners are updated. So I decided to custom counter. This have potential issue as thermal netlink registers before intel_hif, so theoretically intel_hif can miss events. But since both are required to be kernel build-in (if CONFIG_INTEL_HFI_THERMAL is configured), they start before any user-space. v1: https://lore.kernel.org/linux-pm/20240131120535.933424-1-stanislaw.gruszka@linux.intel.com// v2: https://lore.kernel.org/linux-pm/20240206133605.1518373-1-stanislaw.gruszka@linux.intel.com/ v3: https://lore.kernel.org/linux-pm/20240209120625.1775017-1-stanislaw.gruszka@linux.intel.com/ v4: https://lore.kernel.org/linux-pm/20240212161615.161935-1-stanislaw.gruszka@linux.intel.com/ *** BLURB HERE *** Stanislaw Gruszka (3): thermal: netlink: Add genetlink bind/unbind notifications thermal: netlink: Rename thermal_gnl_family thermal: intel: hfi: Enable interface only when required drivers/thermal/intel/intel_hfi.c | 97 ++++++++++++++++++++++++++++--- drivers/thermal/thermal_netlink.c | 62 +++++++++++++++----- drivers/thermal/thermal_netlink.h | 26 +++++++++ 3 files changed, 161 insertions(+), 24 deletions(-)