From patchwork Wed Jan 31 12:05:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanislaw Gruszka X-Patchwork-Id: 13539434 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.93]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C989E7D403; Wed, 31 Jan 2024 13:09:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.55.52.93 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706706582; cv=none; b=oVvrn/x00GZ2+akyNgzQioytkN8NVcSCJt2dkmm9W62GdipdoT9D38fM0qoFuMT9+H5odQ0JIO0Ct1tF+lXIrMRmWVoembXN6h6rEohS0r8s8l+4Rmts1vjjj/2DE/mq278NRGAp/uU+YdI1GR4Ykr4vOECVRslQ8GWJlRLNXXs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706706582; c=relaxed/simple; bh=AtaaNaDVSVp1qgefliVmsQbCeAhN8VRIRGY8S25G6hQ=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=Vppx93kype4PSUXoMuvt7HGymUtHBb1WHQjac6JJXAevuG5GBHwrpoXd1MO7+/f/dLQlYvtvOlPMdsWshcUgUOHEPlrEacc8dGugrjLsYQ/yHdkUC3gFpf7hQ5tqfzT5w8PjJPC+8dEEjVcMc0e6/o7+z2y5RfY7ZTM+2Rd61ag= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=gvDlT928; arc=none smtp.client-ip=192.55.52.93 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="gvDlT928" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1706706580; x=1738242580; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=AtaaNaDVSVp1qgefliVmsQbCeAhN8VRIRGY8S25G6hQ=; b=gvDlT928BgdxntfCyN8F+5vMX0XUYDkG67+biYeQ5p+RJizh7fNtn/Le xHwwe3mbNojMFNDwaM/vuw7jyPf59Ajy29+i0B6y8B+15RMYSbTeAX8Iw wSwPrj2B4rSjz6KvTeZl0TwZHiys+5pP0KioW1isWSSvj1KFwzHSGxtS9 VAs++g6RJBMSyTw7Tax3o5DkbF+F2QHhHe4Ci7+C6TsKatYcIjWJI02ah skFqbaSSnp5s46U6V6TX98nvbtNjXaJCDmb4p0doN3Xch9RGuVHS5uouu 5wzlj8hGZiOICqOia5QER+uU44yl6IKs6XgBa6gGNemZbtPMSuwJSB8aH A==; X-IronPort-AV: E=McAfee;i="6600,9927,10969"; a="400734628" X-IronPort-AV: E=Sophos;i="6.05,231,1701158400"; d="scan'208";a="400734628" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jan 2024 05:09:39 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10969"; a="911783179" X-IronPort-AV: E=Sophos;i="6.05,231,1701158400"; d="scan'208";a="911783179" Received: from sgruszka-mobl.ger.corp.intel.com (HELO localhost) ([10.252.43.19]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jan 2024 05:09:36 -0800 From: Stanislaw Gruszka To: linux-pm@vger.kernel.org Cc: "Rafael J. Wysocki" , Srinivas Pandruvada , Ricardo Neri , Daniel Lezcano , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org Subject: [PATCH 0/3] thermal/netlink/intel_hfi: Enable HFI feature only when required Date: Wed, 31 Jan 2024 13:05:32 +0100 Message-Id: <20240131120535.933424-1-stanislaw.gruszka@linux.intel.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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(-)