From patchwork Mon Jun 26 14:41:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Bringmann X-Patchwork-Id: 780746 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3wxBdC5lHRz9s7f for ; Tue, 27 Jun 2017 00:43:43 +1000 (AEST) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3wxBdC3H4KzDr2x for ; Tue, 27 Jun 2017 00:43:43 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3wxBbB3KcHzDr2w for ; Tue, 27 Jun 2017 00:41:58 +1000 (AEST) Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v5QEdHXv125342 for ; Mon, 26 Jun 2017 10:41:56 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0a-001b2d01.pphosted.com with ESMTP id 2bb2b2wtb4-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 26 Jun 2017 10:41:56 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 26 Jun 2017 10:41:51 -0400 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v5QEfo4S52428842; Mon, 26 Jun 2017 14:41:50 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 70286112056; Mon, 26 Jun 2017 10:41:53 -0400 (EDT) Received: from oc1554177480.ibm.com (unknown [9.53.92.228]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP id C7E77112047; Mon, 26 Jun 2017 10:41:52 -0400 (EDT) To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org From: Michael Bringmann Subject: [PATCH V7 1/2] powerpc/hotplug: Ensure enough nodes avail for operations Organization: IBM Linux Technology Center In-Reply-To: <92f2886f-e517-445e-3992-deddde9ac817@linux.vnet.ibm.com> Date: Mon, 26 Jun 2017 09:41:49 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 MIME-Version: 1.0 Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 17062614-0008-0000-0000-0000024D525F X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007280; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000214; SDB=6.00878984; UDB=6.00438038; IPR=6.00659137; BA=6.00005442; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00015954; XFM=3.00000015; UTC=2017-06-26 14:41:52 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17062614-0009-0000-0000-000035CE3B70 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-06-26_11:, , 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-1706260246 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michael Bringmann , Tyrel Datwyler , Nathan Fontenot , John Allen Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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. Signed-off-by: Michael Bringmann --- --- arch/powerpc/mm/numa.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index e6f742d..0746d93 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -60,10 +60,27 @@ static int n_mem_addr_cells, n_mem_size_cells; static int form1_affinity; +#define TOPOLOGY_DEF_NUM_NODES 0 #define MAX_DISTANCE_REF_POINTS 4 static int distance_ref_points_depth; static const __be32 *distance_ref_points; static int distance_lookup_table[MAX_NUMNODES][MAX_DISTANCE_REF_POINTS]; +static int topology_num_nodes = TOPOLOGY_DEF_NUM_NODES; + +/* + * Topology-related early parameters + */ +static int __init early_num_nodes(char *p) +{ + if (!p) + return 1; + + topology_num_nodes = memparse(p, &p); + dbg("topology num nodes = 0x%d\n", topology_num_nodes); + + return 0; +} +early_param("numnodes", early_num_nodes); /* * Allocate node_to_cpumask_map based on number of available nodes @@ -892,6 +909,18 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) NODE_DATA(nid)->node_spanned_pages = spanned_pages; } +static void __init setup_min_nodes(void) +{ + int i, l = topology_num_nodes; + + for (i = 0; i < l; i++) { + if (!node_possible(i)) { + setup_node_data(i, 0, 0); + node_set(i, node_possible_map); + } + } +} + void __init initmem_init(void) { int nid, cpu; @@ -911,6 +940,8 @@ void __init initmem_init(void) */ nodes_and(node_possible_map, node_possible_map, node_online_map); + setup_min_nodes(); + for_each_online_node(nid) { unsigned long start_pfn, end_pfn;