From nobody Thu Oct 2 07:48:36 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 8DC0123BCED; Sun, 21 Sep 2025 03:20:15 +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=1758424817; cv=none; b=fT/4rBDMeOMrQlMnJMRGF1SA01P1/C1cNgzyNy+Q7f6EYoTmnakW+5uQ8XjkwLmf+tVmXDt2m4d+9mDlZVgwapxKaFWnFeEHBlbTl1Y8ztUBpuvR6VyXVJ2jzXBe4Z36tTbE3WOGJWdpGM0oS19OqOs7vzUmiam26M+orWM8hyY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758424817; c=relaxed/simple; bh=h11SGtV5bb+zU+5RXvkBOpOEmZiHT6WNp4XydOTIj00=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oW2zj/BoAzDiorJLyUBBdn9XaE6z1Ys5khwpxpTfe8b1qfG0p1TI65obKoxOWQBEC9SpPKGYi1tzeC35gcUt5V0pHU05d1JzzYn2bNvqHVG5TqExgN5CNCED+UxLyE1QXzFJDGaGCOTYmxD6kHI2kmBERSZFWNs1bEV6mvHXowY= 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=HTScwmjS; 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="HTScwmjS" 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=TIBfhTObXQDjnOaizlcq1EWJ8ASUl0ca19LxkyMR434=; b=HTScwmjScqf9kfqQ0a8/qVovZI aIgtVb/bD8noKgj4//ipaskxxItfKFibf3CF8S1cpMQaJtF54miWc8ii5EcO/QCUiI22DjUoiKM6M qfcGFFCNTMBhQlfZFH8CX9rQv5vLODiMjkchUTOaNjwG2xxM/iu5jYE3HNDyji0UueVELGVh6t4Ft 9OPH+qKG5MITNnEteXnqFLcgv2goFsWrW3X6zLBuZu5iEfrpQ42A8SsfPu0I8mj6aAikrzn8iBY7B Yek34GJ9EeMkp6NQWe1vCaV3Xep4EoiHS7G3gN4xxAphF4trwYSDnKLVtRhk9AEY2yUO8WjXbwZi3 kCQqDwew==; Received: from [58.29.143.236] (helo=localhost) by fanzine2.igalia.com with utf8esmtpsa (Cipher TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1v0AcR-00Eciq-Nj; Sun, 21 Sep 2025 05:20:08 +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 RESEND v4 06/10] PM: EM: Implement em_nl_get_pds_doit() Date: Sun, 21 Sep 2025 12:19:24 +0900 Message-ID: <20250921031928.205869-7-changwoo@igalia.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250921031928.205869-1-changwoo@igalia.com> References: <20250921031928.205869-1-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" When a userspace requests EM_CMD_GET_PDS, the kernel responds with information on all performance domains. The message format of the response is as follows: EM_A_PDS_PD (NLA_NESTED)* EM_A_PD_PD_ID (NLA_U32) EM_A_PD_FLAGS (NLA_U64) EM_A_PD_CPUS (NLA_STRING) where EM_A_PDS_PD can be repeated as many times as there are performance domains, and EM_A_PD_CPUS is a hexadecimal string representing a CPU bitmask. Signed-off-by: Changwoo Min --- kernel/power/em_netlink.c | 82 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 81 insertions(+), 1 deletion(-) diff --git a/kernel/power/em_netlink.c b/kernel/power/em_netlink.c index f3fbfeff29a4..31b27c6fe3c9 100644 --- a/kernel/power/em_netlink.c +++ b/kernel/power/em_netlink.c @@ -17,9 +17,89 @@ #include "em_netlink.h" #include "em_netlink_autogen.h" =20 +#define EM_A_PD_CPUS_LEN 256 + +/*************************** Command encoding ****************************= ****/ +static int __em_nl_get_pd_size(struct em_perf_domain *pd, void *data) +{ + char cpus_buf[EM_A_PD_CPUS_LEN]; + int *tot_msg_sz =3D data; + int msg_sz, cpus_sz; + + cpus_sz =3D snprintf(cpus_buf, sizeof(cpus_buf), "%*pb", + cpumask_pr_args(to_cpumask(pd->cpus))); + + msg_sz =3D nla_total_size(0) + /* EM_A_PDS_PD */ + nla_total_size(sizeof(u32)) + /* EM_A_PD_PD_ID */ + nla_total_size_64bit(sizeof(u64)) + /* EM_A_PD_FLAGS */ + nla_total_size(cpus_sz); /* EM_A_PD_CPUS */ + + *tot_msg_sz +=3D nlmsg_total_size(genlmsg_msg_size(msg_sz)); + return 0; +} + +static int __em_nl_get_pd(struct em_perf_domain *pd, void *data) +{ + char cpus_buf[EM_A_PD_CPUS_LEN]; + struct sk_buff *msg =3D data; + struct nlattr *entry; + + entry =3D nla_nest_start(msg, EM_A_PDS_PD); + if (!entry) + goto out_cancel_nest; + + if (nla_put_u32(msg, EM_A_PD_PD_ID, pd->id)) + goto out_cancel_nest; + + if (nla_put_u64_64bit(msg, EM_A_PD_FLAGS, pd->flags, EM_A_PD_PAD)) + goto out_cancel_nest; + + snprintf(cpus_buf, sizeof(cpus_buf), "%*pb", + cpumask_pr_args(to_cpumask(pd->cpus))); + if (nla_put_string(msg, EM_A_PD_CPUS, cpus_buf)) + goto out_cancel_nest; + + nla_nest_end(msg, entry); + + return 0; + +out_cancel_nest: + nla_nest_cancel(msg, entry); + + return -EMSGSIZE; +} + int em_nl_get_pds_doit(struct sk_buff *skb, struct genl_info *info) { - return -EOPNOTSUPP; + struct sk_buff *msg; + void *hdr; + int cmd =3D info->genlhdr->cmd; + int ret =3D -EMSGSIZE, msg_sz =3D 0; + + for_each_em_perf_domain(__em_nl_get_pd_size, &msg_sz); + + msg =3D genlmsg_new(msg_sz, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + hdr =3D genlmsg_put_reply(msg, info, &em_nl_family, 0, cmd); + if (!hdr) + goto out_free_msg; + + ret =3D for_each_em_perf_domain(__em_nl_get_pd, msg); + if (ret) + goto out_cancel_msg; + + genlmsg_end(msg, hdr); + + return genlmsg_reply(msg, info); + +out_cancel_msg: + genlmsg_cancel(msg, hdr); +out_free_msg: + nlmsg_free(msg); + + return ret; } =20 int em_nl_get_pd_table_doit(struct sk_buff *skb, struct genl_info *info) --=20 2.51.0