From patchwork Wed Apr 29 23:29:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Christensen X-Patchwork-Id: 69564 Return-Path: X-Original-To: patchwork@inbox.dpdk.org Delivered-To: patchwork@inbox.dpdk.org Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 49DF0A00C5; Thu, 30 Apr 2020 01:29:45 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 2955B1D94F; Thu, 30 Apr 2020 01:29:45 +0200 (CEST) Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by dpdk.org (Postfix) with ESMTP id 1BB121D53E for ; Thu, 30 Apr 2020 01:29:44 +0200 (CEST) Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 03TN4GhR189768 for ; Wed, 29 Apr 2020 19:29:43 -0400 Received: from ppma01dal.us.ibm.com (83.d6.3fa9.ip4.static.sl-reverse.com [169.63.214.131]) by mx0a-001b2d01.pphosted.com with ESMTP id 30q8034kxn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 29 Apr 2020 19:29:43 -0400 Received: from pps.filterd (ppma01dal.us.ibm.com [127.0.0.1]) by ppma01dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id 03TNTQ1g015943 for ; Wed, 29 Apr 2020 23:29:42 GMT Received: from b03cxnp08025.gho.boulder.ibm.com (b03cxnp08025.gho.boulder.ibm.com [9.17.130.17]) by ppma01dal.us.ibm.com with ESMTP id 30mcu7awnj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 29 Apr 2020 23:29:42 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 03TNTeis14156286 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 29 Apr 2020 23:29:40 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1CE51C605B; Wed, 29 Apr 2020 23:29:41 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D46B4C6055; Wed, 29 Apr 2020 23:29:39 +0000 (GMT) Received: from localhost.localdomain (unknown [9.114.224.51]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 29 Apr 2020 23:29:39 +0000 (GMT) From: David Christensen To: dev@dpdk.org Cc: David Christensen Date: Wed, 29 Apr 2020 16:29:29 -0700 Message-Id: <20200429232931.87233-1-drc@linux.vnet.ibm.com> X-Mailer: git-send-email 2.18.1 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.676 definitions=2020-04-29_11:2020-04-29, 2020-04-29 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 suspectscore=1 phishscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 spamscore=0 clxscore=1015 mlxlogscore=734 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004290164 Subject: [dpdk-dev] [PATCH 0/2] vfio: change spapr DMA window sizing operation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" The SPAPR v2 IOMMU used on bare-metal PowerNV systems requires that a DMA window be defined before mapping/unmapping memory. The current VFIO code dynamically resizes this DMA window every time a new memory request is made, which requires that all existing memory be unmapped/remapped. While this strategy worked in DPDK 17.11 and earlier where memory was statically allocated during startup, it is potentially dangerous in DPDK 18.11 and later where memory can be allocated during runtime, temporarily invalidating IOVA memory used by hardware. This new code statically sizes the DMA window at startup, based on the amount of memory installed in the system, avoiding the need to unmap memory during runtime. David Christensen (2): vfio: use ifdef's for ppc64 spapr code vfio: modify spapr iommu support to use static window sizing lib/librte_eal/linux/eal_vfio.c | 396 +++++++++++++++----------------- 1 file changed, 187 insertions(+), 209 deletions(-) --- 2.18.1