From patchwork Fri Jun 13 09:44:24 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Changwoo Min X-Patchwork-Id: 896138 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 654D82C326F; Fri, 13 Jun 2025 09:45:18 +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=1749807921; cv=none; b=tIHiI/WxjwfLOg4IkpS/+BmdaGp8IntEjF71OonlzbvUaAP4MFgCgSn20VivUYJxJksHOyDu2NTZq8BkGi4xjhgAoUBnASV/liEnw/bKOsyIU9XXflSG1TuSRWUBq6+0OvSrMtaRcQyX0Imkg6Hdgk5hk54nljdHdZkFZfXCjXo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749807921; c=relaxed/simple; bh=0fUfb/7iQy2Ry46AdKwsF4sPmPnlkBPoezWnsyQxiSc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=V+yCsGi5zCtO0bUU3vR33tu1qxxThzmcLGVX1azdF+CJ+5WRj1WKJ20l0Bs4/z/aSmRo7lED++X/oGvtIzmydLxhDm+yCeloP3/uryNVnYM/syCPpNoOfVznwqxYaAqtJkYd249vHrN11f5A/TBt+p+fxkfQZWY/l3bkac2u1AI= 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=DQVvNel+; 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="DQVvNel+" 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=HBAsjye6xKGx0gbxJhmeJRLorGD10JK1fEjIpuq7QUk=; b=DQVvNel+ozZqdr9iLHKzjr1UjS 7n/ylPfMO5Y6HWyqS2ILF8XI2iTDbIurLhfRjDWbB2RPM2HKMaF/BSS088dNkYBaLToWDc5tePQUV bRFEGTU7hN8RnPPhaYq3x8PYgAchdWXh3FNL+P2Iq/5rGK2pt9+hE3Sp0lBH8UkDkq+KqsGk9RyhR EMegmkzQpKi6K1c2jE4tvr9fSPNo2hnmwnpu/5GLnDIpDX/2+an0sd7OtPg64Rr8VcSXDD+ZxFQcX eoVmfiInL49bdFfWLMk63wsu/ZSthKGDA0fQvcLTj6kXXLtuhRk8BCyd3+Lo9mXwuXm4nKfRCwVcU NHKP3qAA==; 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 1uQ0yD-002xeQ-NN; Fri, 13 Jun 2025 11:45:10 +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 v2 06/10] PM: EM: Implement em_nl_get_pds_doit(). Date: Fri, 13 Jun 2025 18:44:24 +0900 Message-ID: <20250613094428.267791-7-changwoo@igalia.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250613094428.267791-1-changwoo@igalia.com> References: <20250613094428.267791-1-changwoo@igalia.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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" +#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 = data; + int msg_sz, cpus_sz; + + cpus_sz = snprintf(cpus_buf, sizeof(cpus_buf), "%*pb", + cpumask_pr_args(to_cpumask(pd->cpus))); + + msg_sz = 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 += 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 = data; + struct nlattr *entry; + + entry = 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 = info->genlhdr->cmd; + int ret = -EMSGSIZE, msg_sz = 0; + + for_each_em_perf_domain(__em_nl_get_pd_size, &msg_sz); + + msg = genlmsg_new(msg_sz, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + hdr = genlmsg_put_reply(msg, info, &em_nl_family, 0, cmd); + if (!hdr) + goto out_free_msg; + + ret = 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; } int em_nl_get_pd_table_doit(struct sk_buff *skb, struct genl_info *info)