From patchwork Fri Feb 23 15:59:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanislaw Gruszka X-Patchwork-Id: 775676 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) (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 0082183A13 for ; Fri, 23 Feb 2024 15:59:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.17 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708703992; cv=none; b=sPssSE0EKaWJ3HnQW9jQXY3K2OTbdCfLGIyobPA1wmU67q5ViJKIThbTBl9q6jYOUg5QxF4mxIEBjlq2PR972tSNCsP1BiofnNm3oCtMnRO+qL2izq31gFhPO+Y1fzhcWa2ZuUupwmu/KpgBkFK0uBURKfwJ52h0dLaPKw1iiwI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708703992; c=relaxed/simple; bh=nbncvWSmtcdEGM3duaASMr9ciLvNC7n2wGSaxs2VByw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=q+62UT8V9N6aaJRZrEniihWynz8kE/rfsaHkxcHJrFYhVSHgCMu+sjN41OAZz5NtBclcQY8HVbktjaGkRADIUxSoJJ9gHbtjB9FzlxOrKFIRhQO536ICW3Hwp5ye6DOfGrs0lrWPJQ7bnyyr4nPImJhF5kTtwhyYdQTZr2zfhSA= 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=Ar7CECH+; arc=none smtp.client-ip=198.175.65.17 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="Ar7CECH+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1708703991; x=1740239991; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=nbncvWSmtcdEGM3duaASMr9ciLvNC7n2wGSaxs2VByw=; b=Ar7CECH+bkJkWV8Zxueyj1tMhSScSaE/InXCyVavkiwxg46dXpvW2UZc GKbpS9tPl0xyJZHV8CQ1lNBeK/WagC2uTZVE2XPimYEc6TDZJoW0xXiat 05yY3FWJhro67C8c9nrie9tQRKwgtH2A/nKO7TEC3KLhA0RrLl5IrTvO2 GBuapgpSuFLYz3VMnpAJZF4UjSnrOALyP1PJkanEZkHgGdtlbW8awhezT heTkZgPiIHKOKiwYESe4Qrj6qy1yx9MK3xDr4gnUkDaiycP3O20l38V/B Iee/5wNHBWo4+cASBXepPAcofIEMCPhIwPrxTFT67xNjRsOjjoYSduhoI g==; X-IronPort-AV: E=McAfee;i="6600,9927,10993"; a="3179309" X-IronPort-AV: E=Sophos;i="6.06,180,1705392000"; d="scan'208";a="3179309" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Feb 2024 07:59:51 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,180,1705392000"; d="scan'208";a="36956508" Received: from sgruszka-mobl.ger.corp.intel.com (HELO localhost) ([10.252.47.110]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Feb 2024 07:59:49 -0800 From: Stanislaw Gruszka To: linux-pm@vger.kernel.org Cc: "Rafael J. Wysocki" , Srinivas Pandruvada , Ricardo Neri , Daniel Lezcano Subject: [PATCH v5 1/3] thermal: netlink: Add genetlink bind/unbind notifications Date: Fri, 23 Feb 2024 16:59:40 +0100 Message-Id: <20240223155942.60813-2-stanislaw.gruszka@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240223155942.60813-1-stanislaw.gruszka@linux.intel.com> References: <20240223155942.60813-1-stanislaw.gruszka@linux.intel.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Introduce a new feature to the thermal netlink framework, enabling the registration of sub drivers to receive events via a notifier mechanism. Specifically, implement genetlink family bind and unbind callbacks to send BIND and UNBIND events. The primary purpose of this enhancement is to facilitate the tracking of user-space consumers by the Intel HFI driver. By leveraging these notifications, the driver can determine when consumers are present or absent. Suggested-by: Jakub Kicinski Signed-off-by: Stanislaw Gruszka --- drivers/thermal/thermal_netlink.c | 40 +++++++++++++++++++++++++++---- drivers/thermal/thermal_netlink.h | 26 ++++++++++++++++++++ 2 files changed, 61 insertions(+), 5 deletions(-) diff --git a/drivers/thermal/thermal_netlink.c b/drivers/thermal/thermal_netlink.c index 76a231a29654..d407130563e5 100644 --- a/drivers/thermal/thermal_netlink.c +++ b/drivers/thermal/thermal_netlink.c @@ -7,17 +7,13 @@ * Generic netlink for thermal management framework */ #include +#include #include #include #include #include "thermal_core.h" -enum thermal_genl_multicast_groups { - THERMAL_GENL_SAMPLING_GROUP = 0, - THERMAL_GENL_EVENT_GROUP = 1, -}; - static const struct genl_multicast_group thermal_genl_mcgrps[] = { [THERMAL_GENL_SAMPLING_GROUP] = { .name = THERMAL_GENL_SAMPLING_GROUP_NAME, }, [THERMAL_GENL_EVENT_GROUP] = { .name = THERMAL_GENL_EVENT_GROUP_NAME, }, @@ -75,6 +71,7 @@ struct param { typedef int (*cb_t)(struct param *); static struct genl_family thermal_gnl_family; +static BLOCKING_NOTIFIER_HEAD(thermal_genl_chain); static int thermal_group_has_listeners(enum thermal_genl_multicast_groups group) { @@ -645,6 +642,27 @@ static int thermal_genl_cmd_doit(struct sk_buff *skb, return ret; } +static int thermal_genl_bind(int mcgrp) +{ + struct thermal_genl_notify n = { .mcgrp = mcgrp }; + + if (WARN_ON_ONCE(mcgrp > THERMAL_GENL_MAX_GROUP)) + return -EINVAL; + + blocking_notifier_call_chain(&thermal_genl_chain, THERMAL_NOTIFY_BIND, &n); + return 0; +} + +static void thermal_genl_unbind(int mcgrp) +{ + struct thermal_genl_notify n = { .mcgrp = mcgrp }; + + if (WARN_ON_ONCE(mcgrp > THERMAL_GENL_MAX_GROUP)) + return; + + blocking_notifier_call_chain(&thermal_genl_chain, THERMAL_NOTIFY_UNBIND, &n); +} + static const struct genl_small_ops thermal_genl_ops[] = { { .cmd = THERMAL_GENL_CMD_TZ_GET_ID, @@ -679,6 +697,8 @@ static struct genl_family thermal_gnl_family __ro_after_init = { .version = THERMAL_GENL_VERSION, .maxattr = THERMAL_GENL_ATTR_MAX, .policy = thermal_genl_policy, + .bind = thermal_genl_bind, + .unbind = thermal_genl_unbind, .small_ops = thermal_genl_ops, .n_small_ops = ARRAY_SIZE(thermal_genl_ops), .resv_start_op = THERMAL_GENL_CMD_CDEV_GET + 1, @@ -686,6 +706,16 @@ static struct genl_family thermal_gnl_family __ro_after_init = { .n_mcgrps = ARRAY_SIZE(thermal_genl_mcgrps), }; +int thermal_genl_register_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&thermal_genl_chain, nb); +} + +int thermal_genl_unregister_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&thermal_genl_chain, nb); +} + int __init thermal_netlink_init(void) { return genl_register_family(&thermal_gnl_family); diff --git a/drivers/thermal/thermal_netlink.h b/drivers/thermal/thermal_netlink.h index 93a927e144d5..e01221e8816b 100644 --- a/drivers/thermal/thermal_netlink.h +++ b/drivers/thermal/thermal_netlink.h @@ -10,6 +10,19 @@ struct thermal_genl_cpu_caps { int efficiency; }; +enum thermal_genl_multicast_groups { + THERMAL_GENL_SAMPLING_GROUP = 0, + THERMAL_GENL_EVENT_GROUP = 1, + THERMAL_GENL_MAX_GROUP = THERMAL_GENL_EVENT_GROUP, +}; + +#define THERMAL_NOTIFY_BIND 0 +#define THERMAL_NOTIFY_UNBIND 1 + +struct thermal_genl_notify { + int mcgrp; +}; + struct thermal_zone_device; struct thermal_trip; struct thermal_cooling_device; @@ -18,6 +31,9 @@ struct thermal_cooling_device; #ifdef CONFIG_THERMAL_NETLINK int __init thermal_netlink_init(void); void __init thermal_netlink_exit(void); +int thermal_genl_register_notifier(struct notifier_block *nb); +int thermal_genl_unregister_notifier(struct notifier_block *nb); + int thermal_notify_tz_create(const struct thermal_zone_device *tz); int thermal_notify_tz_delete(const struct thermal_zone_device *tz); int thermal_notify_tz_enable(const struct thermal_zone_device *tz); @@ -48,6 +64,16 @@ static inline int thermal_notify_tz_create(const struct thermal_zone_device *tz) return 0; } +static inline int thermal_genl_register_notifier(struct notifier_block *nb) +{ + return 0; +} + +static inline int thermal_genl_unregister_notifier(struct notifier_block *nb) +{ + return 0; +} + static inline int thermal_notify_tz_delete(const struct thermal_zone_device *tz) { return 0;