From patchwork Thu Sep 17 14:20:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Rosato X-Patchwork-Id: 11783469 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D8B07159A for ; Thu, 17 Sep 2020 19:56:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2637208E4 for ; Thu, 17 Sep 2020 19:56:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="sBsphagV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726828AbgIQT4X (ORCPT ); Thu, 17 Sep 2020 15:56:23 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:61802 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727764AbgIQOqC (ORCPT ); Thu, 17 Sep 2020 10:46:02 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 08HE5WM1049524; Thu, 17 Sep 2020 10:21:12 -0400 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; s=pp1; bh=kspthwTVis4qtTnUOP3Qt5q4hBaR2PUDwTv3DnEx+Lg=; b=sBsphagVzSC1BLEoe9H7BI4gGS2IK1t0yLyUO5bSi+AiiwazIZo0wTpLuTUE3J9uWSxx Wdi0F8Wk9NtOITlt9WXKPMJZMtpx3/T32s0q87Nybj2id1QZHkcNhfHsYxEyniiyeSYg 5JSrd1KqE0qoB0L67HmKPmJayGi0DH8kYrDcyTXAFuzROCg3C88vfGMhn2zspgiAR5rE XSf+IViXD6PNkx56O4bdRgh6Pu6W8HsCwEPeiP3L0/Wvb3ax0QxObzUDn06naOLv8GBO UcseR8Ln8GWEHGH/6pQeUeyKYkgyDHM2GnzFhV3c8Q8MTPgF8voczwPLVDjbWqJGzcmw Lg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 33m92r8vcv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 17 Sep 2020 10:21:11 -0400 Received: from m0098409.ppops.net (m0098409.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 08HE6Wmd054838; Thu, 17 Sep 2020 10:21:11 -0400 Received: from ppma04dal.us.ibm.com (7a.29.35a9.ip4.static.sl-reverse.com [169.53.41.122]) by mx0a-001b2d01.pphosted.com with ESMTP id 33m92r8vbx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 17 Sep 2020 10:21:11 -0400 Received: from pps.filterd (ppma04dal.us.ibm.com [127.0.0.1]) by ppma04dal.us.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 08HEH6Xi010058; Thu, 17 Sep 2020 14:21:09 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma04dal.us.ibm.com with ESMTP id 33m7u9run7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 17 Sep 2020 14:21:09 +0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 08HEL81f46268818 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 17 Sep 2020 14:21:08 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8F0B8AC05F; Thu, 17 Sep 2020 14:21:08 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 04401AC059; Thu, 17 Sep 2020 14:21:06 +0000 (GMT) Received: from oc4221205838.ibm.com (unknown [9.163.85.51]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 17 Sep 2020 14:21:05 +0000 (GMT) From: Matthew Rosato To: alex.williamson@redhat.com, cohuck@redhat.com Cc: pmorel@linux.ibm.com, schnelle@linux.ibm.com, rth@twiddle.net, david@redhat.com, thuth@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, mst@redhat.com, pbonzini@redhat.com, philmd@redhat.com, qemu-s390x@nongnu.org, qemu-devel@nongnu.org, kvm@vger.kernel.org Subject: [PATCH v4 4/5] s390x/pci: Add routine to get the vfio dma available count Date: Thu, 17 Sep 2020 10:20:44 -0400 Message-Id: <1600352445-21110-5-git-send-email-mjrosato@linux.ibm.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1600352445-21110-1-git-send-email-mjrosato@linux.ibm.com> References: <1600352445-21110-1-git-send-email-mjrosato@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-09-17_09:2020-09-16,2020-09-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxscore=0 phishscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 impostorscore=0 clxscore=1015 suspectscore=0 adultscore=0 lowpriorityscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009170104 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Create new files for separating out vfio-specific work for s390 pci. Add the first such routine, which issues VFIO_IOMMU_GET_INFO ioctl to collect the current dma available count. Signed-off-by: Matthew Rosato Reviewed-by: Cornelia Huck --- hw/s390x/meson.build | 1 + hw/s390x/s390-pci-vfio.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++ hw/s390x/s390-pci-vfio.h | 17 +++++++++++++++ 3 files changed, 72 insertions(+) create mode 100644 hw/s390x/s390-pci-vfio.c create mode 100644 hw/s390x/s390-pci-vfio.h diff --git a/hw/s390x/meson.build b/hw/s390x/meson.build index b63782d..ed2f66b 100644 --- a/hw/s390x/meson.build +++ b/hw/s390x/meson.build @@ -10,6 +10,7 @@ s390x_ss.add(files( 's390-ccw.c', 's390-pci-bus.c', 's390-pci-inst.c', + 's390-pci-vfio.c', 's390-skeys.c', 's390-stattrib.c', 's390-virtio-hcall.c', diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c new file mode 100644 index 0000000..f86654d --- /dev/null +++ b/hw/s390x/s390-pci-vfio.c @@ -0,0 +1,54 @@ +/* + * s390 vfio-pci interfaces + * + * Copyright 2020 IBM Corp. + * Author(s): Matthew Rosato + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#include + +#include "qemu/osdep.h" +#include "s390-pci-vfio.h" +#include "hw/vfio/vfio-common.h" + +/* + * Get the current DMA available count from vfio. Returns true if vfio is + * limiting DMA requests, false otherwise. The current available count read + * from vfio is returned in avail. + */ +bool s390_pci_update_dma_avail(int fd, unsigned int *avail) +{ + g_autofree struct vfio_iommu_type1_info *info; + uint32_t argsz; + + assert(avail); + + argsz = sizeof(struct vfio_iommu_type1_info); + info = g_malloc0(argsz); + + /* + * If the specified argsz is not large enough to contain all capabilities + * it will be updated upon return from the ioctl. Retry until we have + * a big enough buffer to hold the entire capability chain. + */ +retry: + info->argsz = argsz; + + if (ioctl(fd, VFIO_IOMMU_GET_INFO, info)) { + return false; + } + + if (info->argsz > argsz) { + argsz = info->argsz; + info = g_realloc(info, argsz); + goto retry; + } + + /* If the capability exists, update with the current value */ + return vfio_get_info_dma_avail(info, avail); +} + diff --git a/hw/s390x/s390-pci-vfio.h b/hw/s390x/s390-pci-vfio.h new file mode 100644 index 0000000..2a5a261 --- /dev/null +++ b/hw/s390x/s390-pci-vfio.h @@ -0,0 +1,17 @@ +/* + * s390 vfio-pci interfaces + * + * Copyright 2020 IBM Corp. + * Author(s): Matthew Rosato + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#ifndef HW_S390_PCI_VFIO_H +#define HW_S390_PCI_VFIO_H + +bool s390_pci_update_dma_avail(int fd, unsigned int *avail); + +#endif