From nobody Thu Feb 12 14:09:58 2026 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (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 995C04F1EE for ; Wed, 12 Jun 2024 18:52:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718218335; cv=none; b=Q61zAjAoxma+vbOZc0VT5JUi3wWhF9w/d82u1OTPHmLWioLK7SQhHerAiWOjhZusiu/4SrNZtk8LeiI5REHknVQHIv3C4L9A3IQOKES59ecJ5yRKhWD9Bl7/hz4VNkl7wrEbr3APjrtu0tCpd4iij+zTiMmh+Ay5SK0RV5oiv4E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718218335; c=relaxed/simple; bh=5JSXHJAUu46lj6snCC04DzSX38aU2k16Nzif4AapOqQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EAauuP3t2jY25f4JExHratajVBvd0CWUMe/2Kx714kTJlblojkL3cyBCM72B5AuRO/b2xnONUEG82AtJtaA/PHqOX7hdC3vIRUc+deSWcTC6O93OSLCLj5U4WIDwHHmMi4lFjAyCjRSTK47Conz4LHFD5KVaSiOs0ZzQie07Dyk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=Cd46wL97; arc=none smtp.client-ip=148.163.158.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="Cd46wL97" Received: from pps.filterd (m0353723.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45CHTeNc025730; Wed, 12 Jun 2024 18:52:00 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=pp1; bh=vW5lsyIFWSZkq 9+WtC/JLBFyEtR2dLFJCqUMsgFyCqs=; b=Cd46wL97RUwSHZ6G+DYdGbVmrMSLr oYJJS0VSN5T8LJ06QP88Ar4RquF+m4OkTeG8PTDeLVijJO3t2HoPrJaCgVUPN+EW /+VWLZrVHIPO5PjW1wuNiN+F27RKu4lryZAhcDvNA4eWkcLOE2YCCIVdDCrk05fj t3F/hsNzhE3j5ES3PDGfZXGaxCKaPwmWONPmlBMupATF1a2KyEW3rC/1ZHeLIvKz hrxJTnDG7ttIJYNWPeygWBLAOwjLcGvaGglX28fe42OWYGZUJv/ShG4bnBNmNB1c FEf0HjedacN5Dhzxg1eRLiaKAuq3eXVWoF+o+kNL+h59EAEwGjyJQN+NA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3yqg4dg771-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Jun 2024 18:51:59 +0000 (GMT) Received: from m0353723.ppops.net (m0353723.ppops.net [127.0.0.1]) by pps.reinject (8.18.0.8/8.18.0.8) with ESMTP id 45CIpxIO020141; Wed, 12 Jun 2024 18:51:59 GMT Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3yqg4dg76w-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Jun 2024 18:51:59 +0000 (GMT) Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 45CHk4Qm023609; Wed, 12 Jun 2024 18:51:58 GMT Received: from smtprelay04.fra02v.mail.ibm.com ([9.218.2.228]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 3yn3umrent-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Jun 2024 18:51:58 +0000 Received: from smtpav04.fra02v.mail.ibm.com (smtpav04.fra02v.mail.ibm.com [10.20.54.103]) by smtprelay04.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 45CIpqDG34603636 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 12 Jun 2024 18:51:55 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C7FAE20040; Wed, 12 Jun 2024 18:51:52 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CEB832004B; Wed, 12 Jun 2024 18:51:49 +0000 (GMT) Received: from li-80eaad4c-2afd-11b2-a85c-af8123d033e3.ibm.com (unknown [9.124.218.62]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 12 Jun 2024 18:51:49 +0000 (GMT) From: "Nysal Jan K.A." To: Michael Ellerman , Thomas Gleixner Cc: Tyrel Datwyler , Michal Suchanek , "Nysal Jan K.A" , Nicholas Piggin , Christophe Leroy , "Naveen N. Rao" , Peter Zijlstra , Laurent Dufour , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] powerpc/topology: Check if a core is online Date: Thu, 13 Jun 2024 00:20:38 +0530 Message-ID: <20240612185046.1826891-3-nysal@linux.ibm.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240612185046.1826891-1-nysal@linux.ibm.com> References: <20240612185046.1826891-1-nysal@linux.ibm.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 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: y0CmASwOnchMM_lNxM3pTCqYDpQRyUjC X-Proofpoint-ORIG-GUID: 7A2i1_wFaeyJnh6LWP4SYwqr0LtVLDaj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-12_09,2024-06-12_02,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 bulkscore=0 mlxlogscore=986 impostorscore=0 spamscore=0 malwarescore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406120131 Content-Type: text/plain; charset="utf-8" From: "Nysal Jan K.A" topology_is_core_online() checks if the core a CPU belongs to is online. The core is online if at least one of the sibling CPUs is online. The first CPU of an online core is also online in the common case, so this should be fairly quick. Signed-off-by: Nysal Jan K.A --- arch/powerpc/include/asm/topology.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm= /topology.h index f4e6f2dd04b7..16bacfe8c7a2 100644 --- a/arch/powerpc/include/asm/topology.h +++ b/arch/powerpc/include/asm/topology.h @@ -145,6 +145,7 @@ static inline int cpu_to_coregroup_id(int cpu) =20 #ifdef CONFIG_HOTPLUG_SMT #include +#include #include =20 static inline bool topology_is_primary_thread(unsigned int cpu) @@ -156,6 +157,18 @@ static inline bool topology_smt_thread_allowed(unsigne= d int cpu) { return cpu_thread_in_core(cpu) < cpu_smt_num_threads; } + +#define topology_is_core_online topology_is_core_online +static inline bool topology_is_core_online(unsigned int cpu) +{ + int i, first_cpu =3D cpu_first_thread_sibling(cpu); + + for (i =3D first_cpu; i < first_cpu + threads_per_core; ++i) { + if (cpu_online(i)) + return true; + } + return false; +} #endif =20 #endif /* __KERNEL__ */ --=20 2.35.3