From patchwork Wed Apr 12 05:21:11 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dong Jia Shi X-Patchwork-Id: 9676507 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 29CE260382 for ; Wed, 12 Apr 2017 05:22:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1C7E728512 for ; Wed, 12 Apr 2017 05:22:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 115CB285A3; Wed, 12 Apr 2017 05:22:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9211D28512 for ; Wed, 12 Apr 2017 05:22:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752974AbdDLFWA (ORCPT ); Wed, 12 Apr 2017 01:22:00 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:49760 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752877AbdDLFVu (ORCPT ); Wed, 12 Apr 2017 01:21:50 -0400 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 v3C5Iekx122243 for ; Wed, 12 Apr 2017 01:21:50 -0400 Received: from e33.co.us.ibm.com (e33.co.us.ibm.com [32.97.110.151]) by mx0a-001b2d01.pphosted.com with ESMTP id 29sb7bwjxg-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 12 Apr 2017 01:21:49 -0400 Received: from localhost by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 11 Apr 2017 23:21:45 -0600 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v3C5Li5r10617132; Tue, 11 Apr 2017 22:21:44 -0700 Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2303AC6037; Tue, 11 Apr 2017 23:21:44 -0600 (MDT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP id 8C758C6042; Tue, 11 Apr 2017 23:21:42 -0600 (MDT) From: Dong Jia Shi To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, qemu-devel@nongnu.org Cc: bjsdjshi@linux.vnet.ibm.com, renxiaof@linux.vnet.ibm.com, cornelia.huck@de.ibm.com, borntraeger@de.ibm.com, agraf@suse.com, alex.williamson@redhat.com Subject: [PATCH v5 09/13] vfio/ccw: get irqs info and set the eventfd fd Date: Wed, 12 Apr 2017 07:21:11 +0200 X-Mailer: git-send-email 2.10.2 In-Reply-To: <20170412052115.101657-1-bjsdjshi@linux.vnet.ibm.com> References: <20170412052115.101657-1-bjsdjshi@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17041205-0008-0000-0000-000007990400 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006921; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000208; SDB=6.00846358; UDB=6.00417460; IPR=6.00624795; BA=6.00005284; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00015014; XFM=3.00000013; UTC=2017-04-12 05:21:47 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17041205-0009-0000-0000-000041698A3F Message-Id: <20170412052115.101657-10-bjsdjshi@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-04-12_04:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1704120046 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP vfio-ccw resorts to the eventfd mechanism to communicate with userspace. We fetch the irqs info via the ioctl VFIO_DEVICE_GET_IRQ_INFO, register a event notifier to get the eventfd fd which is sent to kernel via the ioctl VFIO_DEVICE_SET_IRQS, then we can implement read operation once kernel sends the signal. Signed-off-by: Dong Jia Shi --- hw/vfio/ccw.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c index 20a4d1a..5127c87 100644 --- a/hw/vfio/ccw.c +++ b/hw/vfio/ccw.c @@ -22,6 +22,7 @@ #include "hw/vfio/vfio-common.h" #include "hw/s390x/s390-ccw.h" #include "hw/s390x/ccw-device.h" +#include "qemu/error-report.h" #define TYPE_VFIO_CCW "vfio-ccw" typedef struct VFIOCCWDevice { @@ -30,6 +31,7 @@ typedef struct VFIOCCWDevice { uint64_t io_region_size; uint64_t io_region_offset; struct ccw_io_region *io_region; + EventNotifier io_notifier; } VFIOCCWDevice; static void vfio_ccw_compute_needs_reset(VFIODevice *vdev) @@ -54,6 +56,98 @@ static void vfio_ccw_reset(DeviceState *dev) ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET); } +static void vfio_ccw_io_notifier_handler(void *opaque) +{ + VFIOCCWDevice *vcdev = opaque; + + if (!event_notifier_test_and_clear(&vcdev->io_notifier)) { + return; + } +} + +static void vfio_ccw_register_io_notifier(VFIOCCWDevice *vcdev, Error **errp) +{ + VFIODevice *vdev = &vcdev->vdev; + struct vfio_irq_info *irq_info; + struct vfio_irq_set *irq_set; + size_t argsz; + int32_t *pfd; + + if (vdev->num_irqs < VFIO_CCW_IO_IRQ_INDEX + 1) { + error_setg(errp, "vfio: unexpected number of io irqs %u", + vdev->num_irqs); + return; + } + + argsz = sizeof(*irq_set); + irq_info = g_malloc0(argsz); + irq_info->index = VFIO_CCW_IO_IRQ_INDEX; + irq_info->argsz = argsz; + if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO, + irq_info) < 0 || irq_info->count < 1) { + error_setg(errp, "vfio: Error getting irq info"); + goto get_error; + } + + if (event_notifier_init(&vcdev->io_notifier, 0)) { + error_setg(errp, "vfio: Unable to init event notifier for IO"); + goto get_error; + } + + argsz = sizeof(*irq_set) + sizeof(*pfd); + irq_set = g_malloc0(argsz); + irq_set->argsz = argsz; + irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | + VFIO_IRQ_SET_ACTION_TRIGGER; + irq_set->index = VFIO_CCW_IO_IRQ_INDEX; + irq_set->start = 0; + irq_set->count = 1; + pfd = (int32_t *) &irq_set->data; + + *pfd = event_notifier_get_fd(&vcdev->io_notifier); + qemu_set_fd_handler(*pfd, vfio_ccw_io_notifier_handler, NULL, vcdev); + if (ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) { + error_setg(errp, "vfio: Failed to set up io notification"); + qemu_set_fd_handler(*pfd, NULL, NULL, vcdev); + event_notifier_cleanup(&vcdev->io_notifier); + goto set_error; + } + +set_error: + g_free(irq_set); + +get_error: + g_free(irq_info); +} + +static void vfio_ccw_unregister_io_notifier(VFIOCCWDevice *vcdev) +{ + struct vfio_irq_set *irq_set; + size_t argsz; + int32_t *pfd; + + argsz = sizeof(*irq_set) + sizeof(*pfd); + irq_set = g_malloc0(argsz); + irq_set->argsz = argsz; + irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | + VFIO_IRQ_SET_ACTION_TRIGGER; + irq_set->index = VFIO_CCW_IO_IRQ_INDEX; + irq_set->start = 0; + irq_set->count = 1; + pfd = (int32_t *) &irq_set->data; + *pfd = -1; + + if (ioctl(vcdev->vdev.fd, VFIO_DEVICE_SET_IRQS, irq_set)) { + error_report("vfio: Failed to de-assign device io fd"); + } + + qemu_set_fd_handler(event_notifier_get_fd(&vcdev->io_notifier), + NULL, NULL, vcdev); + event_notifier_cleanup(&vcdev->io_notifier); + + g_free(irq_set); +} + static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp) { VFIODevice *vdev = &vcdev->vdev; @@ -193,8 +287,15 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp) goto out_region_err; } + vfio_ccw_register_io_notifier(vcdev, errp); + if (*errp) { + goto out_notifier_err; + } + return; +out_notifier_err: + vfio_ccw_put_region(vcdev); out_region_err: vfio_put_device(vcdev); out_device_err: @@ -217,6 +318,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp) cdc->unrealize(cdev, errp); } + vfio_ccw_unregister_io_notifier(vcdev); vfio_ccw_put_region(vcdev); vfio_put_device(vcdev); vfio_put_group(group);