From nobody Wed Dec 17 21:54:43 2025 Received: from fanzine2.igalia.com (fanzine2.igalia.com [213.97.179.56]) (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 0AC371EDA3C; Mon, 20 Oct 2025 22:10:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.97.179.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760998235; cv=none; b=ky+ls3l3W/78wYKI460N8NHGksytSZ6PsPCEwOpd0wp5LGFrDU06RPBAGdHa82QRrsOvVPMrXVXeWt5yIGz2v3L7SvevpUtpXbcw90i9BuKqk4jrSauZv9BWYMHlrm/30eJXnGGCS1DMsViUgqVIL4jWTfG7cOm9QuwkGR00suM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760998235; c=relaxed/simple; bh=F/n+yVOEQ6Eii4Ql/sofa4W9UBYJMVjSWOj1xvldWkk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hkTMTeZDpRZkpl4DHQZLgCbc9ZVOJHg60Ns295iDKOWR16vMcq4Mz1bCtEH8CRD0KZeTSmF4zx6ybtQTplKYUv1bXLZXrjXeFRcvHh5rHmHmTzu/sxFmRbVmnJahXfhEqlmT7nqZQPSN9PluZyZoo+Wu9zXgDqdsihNBIkv+w/0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com; spf=pass smtp.mailfrom=igalia.com; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b=UW7dmHMa; arc=none smtp.client-ip=213.97.179.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=igalia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b="UW7dmHMa" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=mA7SQiSKYqIaEOVWZl8iC3UkXTHU0IBOg1L46TE7JKI=; b=UW7dmHMapPAqZMA/jRDEcsjr88 XKbZKzJAtDYxSVkBtaKgwt3VG4tosJ6UaVjBaaYaeLZu9x9NrQCT2CIvkiBQ3aA5CLf8LexeIBnBn 73c2DxKLXz8TiRUV2FQtYcLVCblBnEbYCPwxzzaxk7NaUDDQmXreVKGIfgfRCXll7NUYocznBPiIm wUY72/q5QDMd4qz9pu4c4qP4OMj2nqkVxeQb7fq5md5sI9maFLGVKmCxqrVOFHbk0gROwE/H15s6q b2Iwravc51SHOQrimYnOXzDuBRdH6ry/nskq4GWtESvQNy0DDG6hJfeMmpRxYb78UcTQulN3P0dtN BtbS/LXQ==; Received: from [58.29.143.236] (helo=localhost) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1vAy5C-00CHaJ-VR; Tue, 21 Oct 2025 00:10:28 +0200 From: Changwoo Min To: lukasz.luba@arm.com, rafael@kernel.org, len.brown@intel.com, pavel@kernel.org Cc: christian.loehle@arm.com, tj@kernel.org, kernel-dev@igalia.com, linux-pm@vger.kernel.org, sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org, Changwoo Min Subject: [PATCH v6 08/10] PM: EM: Implement em_notify_pd_deleted() Date: Tue, 21 Oct 2025 07:09:12 +0900 Message-ID: <20251020220914.320832-9-changwoo@igalia.com> X-Mailer: git-send-email 2.51.1.dirty In-Reply-To: <20251020220914.320832-1-changwoo@igalia.com> References: <20251020220914.320832-1-changwoo@igalia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the event notification infrastructure and implement the event notification for when a performance domain is deleted (EM_CMD_PD_DELETED). The event contains the ID of the performance domain (EM_A_PD_TABLE_PD_ID) so the userspace can identify the changed performance domain for further processing. Signed-off-by: Changwoo Min --- kernel/power/em_netlink.c | 44 +++++++++++++++++++++++++++++++++++++++ kernel/power/em_netlink.h | 3 +++ 2 files changed, 47 insertions(+) diff --git a/kernel/power/em_netlink.c b/kernel/power/em_netlink.c index 2addc143401b..1595230bf9a0 100644 --- a/kernel/power/em_netlink.c +++ b/kernel/power/em_netlink.c @@ -213,6 +213,50 @@ int em_nl_get_pd_table_doit(struct sk_buff *skb, struc= t genl_info *info) return ret; } =20 + +/**************************** Event encoding *****************************= ****/ +static int __em_notify_pd_deleted_size(const struct em_perf_domain *pd) +{ + int id_sz =3D nla_total_size(sizeof(u32)); /* EM_A_PD_TABLE_PD_ID */ + + return nlmsg_total_size(genlmsg_msg_size(id_sz)); +} + +void em_notify_pd_deleted(const struct em_perf_domain *pd) +{ + struct sk_buff *msg; + void *hdr; + int msg_sz; + + if (!genl_has_listeners(&em_nl_family, &init_net, EM_NLGRP_EVENT)) + return; + + msg_sz =3D __em_notify_pd_deleted_size(pd); + + msg =3D genlmsg_new(msg_sz, GFP_KERNEL); + if (!msg) + return; + + hdr =3D genlmsg_put(msg, 0, 0, &em_nl_family, 0, EM_CMD_PD_DELETED); + if (!hdr) + goto out_free_msg; + + if (nla_put_u32(msg, EM_A_PD_TABLE_PD_ID, pd->id)) { + goto out_free_msg; + } + + genlmsg_end(msg, hdr); + + genlmsg_multicast(&em_nl_family, msg, 0, EM_NLGRP_EVENT, GFP_KERNEL); + + return; + +out_free_msg: + nlmsg_free(msg); + return; +} + +/**************************** Initialization *****************************= ****/ static int __init em_netlink_init(void) { return genl_register_family(&em_nl_family); diff --git a/kernel/power/em_netlink.h b/kernel/power/em_netlink.h index 8114b018c73b..d56e5865e1ed 100644 --- a/kernel/power/em_netlink.h +++ b/kernel/power/em_netlink.h @@ -13,6 +13,7 @@ int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *), void *data); struct em_perf_domain *em_perf_domain_get_by_id(int id); +void em_notify_pd_deleted(const struct em_perf_domain *pd); #else static inline int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *), @@ -25,6 +26,8 @@ struct em_perf_domain *em_perf_domain_get_by_id(int id) { return NULL; } + +static inline void em_notify_pd_deleted(const struct em_perf_domain *pd) {} #endif =20 #endif /* _EM_NETLINK_H */ --=20 2.51.1.dirty