From patchwork Tue May 23 11:13:01 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 9742349 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 EF0636032C for ; Tue, 23 May 2017 11:43:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DA076287BF for ; Tue, 23 May 2017 11:43:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CEC14287CD; Tue, 23 May 2017 11:43:33 +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 lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4C533287BF for ; Tue, 23 May 2017 11:43:33 +0000 (UTC) Received: from localhost ([::1]:47892 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dD8Ds-0007vd-F5 for patchwork-qemu-devel@patchwork.kernel.org; Tue, 23 May 2017 07:43:32 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43947) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dD7kv-0007fJ-Ho for qemu-devel@nongnu.org; Tue, 23 May 2017 07:13:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dD7kt-00030f-Ol for qemu-devel@nongnu.org; Tue, 23 May 2017 07:13:37 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:57852) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dD7kt-00030H-FO for qemu-devel@nongnu.org; Tue, 23 May 2017 07:13:35 -0400 Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v4NB4NaQ119207 for ; Tue, 23 May 2017 07:13:34 -0400 Received: from e06smtp10.uk.ibm.com (e06smtp10.uk.ibm.com [195.75.94.106]) by mx0a-001b2d01.pphosted.com with ESMTP id 2ama0sg0yh-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 23 May 2017 07:13:34 -0400 Received: from localhost by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 23 May 2017 12:13:29 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v4NBDTY034144294; Tue, 23 May 2017 11:13:29 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 47B74A404D; Tue, 23 May 2017 12:11:54 +0100 (BST) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0F9B0A4057; Tue, 23 May 2017 12:11:54 +0100 (BST) Received: from gondolin.boeblingen.de.ibm.com (unknown [9.152.224.119]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Tue, 23 May 2017 12:11:54 +0100 (BST) From: Cornelia Huck To: peter.maydell@linaro.org, stefanha@redhat.com Date: Tue, 23 May 2017 13:13:01 +0200 X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170523111306.25493-1-cornelia.huck@de.ibm.com> References: <20170523111306.25493-1-cornelia.huck@de.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17052311-0040-0000-0000-00000394A28C X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17052311-0041-0000-0000-0000257D5297 Message-Id: <20170523111306.25493-17-cornelia.huck@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-05-23_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=8.0.1-1703280000 definitions=main-1705230058 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PULL 16/21] vfio/ccw: get irqs info and set the eventfd fd X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Cornelia Huck , borntraeger@de.ibm.com, Dong Jia Shi , agraf@suse.de, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Dong Jia Shi 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. Reviewed-by: Eric Auger Acked-by: Alex Williamson Signed-off-by: Dong Jia Shi Message-Id: <20170517004813.58227-10-bjsdjshi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck --- hw/vfio/ccw.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c index 7ddcfd7767..689a7724b6 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 +56,97 @@ 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_errno(errp, errno, "vfio: Error getting irq info"); + goto out_free_info; + } + + if (event_notifier_init(&vcdev->io_notifier, 0)) { + error_setg_errno(errp, errno, + "vfio: Unable to init event notifier for IO"); + goto out_free_info; + } + + 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); + } + + g_free(irq_set); + +out_free_info: + 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: %m"); + } + + 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; @@ -173,8 +266,15 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp) goto out_region_err; } + vfio_ccw_register_io_notifier(vcdev, &err); + if (err) { + goto out_notifier_err; + } + return; +out_notifier_err: + vfio_ccw_put_region(vcdev); out_region_err: vfio_put_device(vcdev); out_device_err: @@ -195,6 +295,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp) S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev); VFIOGroup *group = vcdev->vdev.group; + vfio_ccw_unregister_io_notifier(vcdev); vfio_ccw_put_region(vcdev); vfio_put_device(vcdev); vfio_put_group(group);