From patchwork Mon Feb 12 16:16:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanislaw Gruszka X-Patchwork-Id: 13553436 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (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 15C613D0B6; Mon, 12 Feb 2024 16:16:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707754591; cv=none; b=UxrZbF8xdLcp/3efcZc9Hpyuoe/FBNH0AfoVMD2rAMl7bD+DRdusNABTFqDxL7uuEGRVD7jmbNUISb8T6oG98VRwdhvLDZyEThFIHHyHz+GrwUykS3Jl3LXDEZaLGwozmEeyFF8Ci7qTwIN9dv5LoVhKPG22xIkmMqIyvg+j2TA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707754591; c=relaxed/simple; bh=w8bJqm2zLHqXeQjNSSGkAO8dL3idyJusrSEDubesOA0=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=EzHUGVS6z7a/oaLYRKXSKuwmol/7fxBSKrATHla4z6/z1QmC6ncCosMK+O177JXKWgsgmWgrGN4NYT+P0WHJLowJ2ILwzeNhNskC0sf/shHXEL3EpjkdHJdsJUKCc4Yrp/Q1CUFAB/VSD20116OO0+TmhedihnKYIC+wg8gOKco= 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=YdyawAx8; arc=none smtp.client-ip=198.175.65.14 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="YdyawAx8" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1707754590; x=1739290590; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=w8bJqm2zLHqXeQjNSSGkAO8dL3idyJusrSEDubesOA0=; b=YdyawAx8wE/IlnWympBBgxIYEDTFnQPu9oL4DDacg+5dvMZm6w1d1ePX 3SsTa27um+w9ucFg4F85rV2L29olTEWL590zK6EDGKCv/pRVWFkFTFtkG cBReZzljgEanHjmn806mqexb5fMJSUjmW0ot8JOFyZAUOdlAEMAklmUMw oVCGEL8VdWgNfgpwdxdNY3p6cayv/Nd/rIYeVmakTPtPduF4wlpeh675J rdKLj/w1RZuiWjdcDiNyX3g2uv2g07QYqN1U8HDOJdlcaL1KYJGN53tlq /Z/zVnagWlJM+EwzG+oASLjwxxnEqkBFqLeYskF/miJlWa4FMB0RLug+i A==; X-IronPort-AV: E=McAfee;i="6600,9927,10982"; a="5551549" X-IronPort-AV: E=Sophos;i="6.06,264,1705392000"; d="scan'208";a="5551549" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2024 08:16:29 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,264,1705392000"; d="scan'208";a="33417890" Received: from sgruszka-mobl.ger.corp.intel.com (HELO localhost) ([10.252.44.2]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2024 08:16:25 -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 , Jiri Pirko , Johannes Berg , Florian Westphal , netdev@vger.kernel.org Subject: [PATCH v4 0/3] thermal/netlink/intel_hfi: Enable HFI feature only when required Date: Mon, 12 Feb 2024 17:16:12 +0100 Message-Id: <20240212161615.161935-1-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 new genetlink family bind/unbind callbacks and thermal/netlink notifications, which 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 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/ Stanislaw Gruszka (3): genetlink: Add per family bind/unbind callbacks thermal: netlink: Add genetlink bind/unbind notifications thermal: intel: hfi: Enable interface only when required drivers/thermal/intel/intel_hfi.c | 95 +++++++++++++++++++++++++++---- drivers/thermal/thermal_netlink.c | 40 +++++++++++-- drivers/thermal/thermal_netlink.h | 26 +++++++++ include/net/genetlink.h | 4 ++ net/netlink/genetlink.c | 30 ++++++++++ 5 files changed, 180 insertions(+), 15 deletions(-)