Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752164AbdFTPPR (ORCPT ); Tue, 20 Jun 2017 11:15:17 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:56564 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751962AbdFTPPO (ORCPT ); Tue, 20 Jun 2017 11:15:14 -0400 To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: Nathan Fontenot , Michael Bringmann , ltc-virtual-io@lists.linux.ibm.com From: Michael Bringmann Subject: [PATCH V6 0/2] powerpc/dlpar: Correct display of hot-add/hot-remove CPUs and memory Organization: IBM Linux Technology Center Date: Tue, 20 Jun 2017 10:14:23 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 17062015-0024-0000-0000-00000298BC3D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007261; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000214; SDB=6.00877489; UDB=6.00437129; IPR=6.00657627; BA=6.00005432; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00015900; XFM=3.00000015; UTC=2017-06-20 15:14:26 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17062015-0025-0000-0000-00004474EAF7 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-06-20_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1706200269 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1663 Lines: 34 On Power systems with shared configurations of CPUs and memory, there are some issues with association of additional CPUs and memory to nodes when hot-adding resources. These patches address some of those problems. powerpc/hotplug: On systems like PowerPC which allow 'hot-add' of CPU or memory resources, it may occur that the new resources are to be inserted into nodes that were not used for these resources at bootup. In the kernel, any node that is used must be defined and initialized at boot. In order to meet both needs, this patch adds a new kernel command line option (numnodes=) for use by the PowerPC architecture-specific code that defines the maximum number of nodes that the kernel will ever need in its current hardware environment. The boot code that initializes nodes for PowerPC will read this value and use it to ensure that all of the desired nodes are setup in the 'node_possible_map', and elsewhere. powerpc/numa: Correct the currently broken capability to set the topology for shared CPUs in LPARs. At boot time for shared CPU lpars, the topology for each shared CPU is set to node zero, however, this is now updated correctly using the Virtual Processor Home Node (VPHN) capabilities information provided by the pHyp. The VPHN handling in Linux is disabled, if PRRN handling is present. Signed-off-by: Michael Bringmann Michael Bringmann (2): powerpc/hotplug: Add option to define max nodes allowing dynamic growth of resources. powerpc/numa: Update CPU topology when VPHN enabled --- Changes in V6: -- Reorder some code to better eliminate unused functions in conditional builds.