From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C7D2EC43381 for ; Thu, 14 Feb 2019 13:51:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9EA03222B6 for ; Thu, 14 Feb 2019 13:51:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2407135AbfBNNv0 (ORCPT ); Thu, 14 Feb 2019 08:51:26 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:59844 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2407048AbfBNNvZ (ORCPT ); Thu, 14 Feb 2019 08:51:25 -0500 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x1EDiISB107121 for ; Thu, 14 Feb 2019 08:51:23 -0500 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0b-001b2d01.pphosted.com with ESMTP id 2qn8hf50t2-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 14 Feb 2019 08:51:23 -0500 Received: from localhost by e06smtp01.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 14 Feb 2019 13:51:18 -0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x1EDpGDu42270880 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 14 Feb 2019 13:51:16 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 60EA94204C; Thu, 14 Feb 2019 13:51:16 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DA93842045; Thu, 14 Feb 2019 13:51:15 +0000 (GMT) Received: from morel-ThinkPad-W530.boeblingen.de.ibm.com (unknown [9.152.224.140]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 14 Feb 2019 13:51:15 +0000 (GMT) From: Pierre Morel To: borntraeger@de.ibm.com Cc: alex.williamson@redhat.com, cohuck@redhat.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, frankja@linux.ibm.com, akrowiak@linux.ibm.com, pasic@linux.ibm.com, david@redhat.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, freude@linux.ibm.com, mimu@linux.ibm.com Subject: [PATCH v3 4/9] s390: ap: tools to find a queue with a specific APQN Date: Thu, 14 Feb 2019 14:51:04 +0100 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1550152269-6317-1-git-send-email-pmorel@linux.ibm.com> References: <1550152269-6317-1-git-send-email-pmorel@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19021413-4275-0000-0000-0000030F7928 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19021413-4276-0000-0000-0000381D9526 Message-Id: <1550152269-6317-5-git-send-email-pmorel@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-02-14_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=884 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902140098 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We need to find the queue with a specific APQN during the handling of the interception of the PQAP/AQIC instruction. To handle the AP associated device reference count we keep track of it in the vfio_ap_queue until we put the device. Signed-off-by: Pierre Morel --- drivers/s390/crypto/vfio_ap_ops.c | 54 +++++++++++++++++++++++++++++++++++ drivers/s390/crypto/vfio_ap_private.h | 1 + 2 files changed, 55 insertions(+) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 900b9cf..2a52c9b 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -24,6 +24,60 @@ #define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough" #define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device" +/** + * vfio_ap_check_apqn: check if a ap_queue is of a given APQN + * + * Returns 1 if we have a match. + * Otherwise returns 0. + */ +static int vfio_ap_check_apqn(struct device *dev, void *data) +{ + struct vfio_ap_queue *q = dev_get_drvdata(dev); + + return (q->apqn == *(int *)data); +} + +/** + * vfio_ap_get_queue: Retrieve a queue with a specific APQN + * @apqn: The queue APQN + * + * Retrieve a queue with a specific APQN from the list of the + * devices associated to the vfio_ap_driver. + * + * The vfio_ap_queue has been already associated with the device + * during the probe. + * Store the associated device for reference counting + * + * Returns the pointer to the associated vfio_ap_queue + */ +static __attribute__((unused)) + struct vfio_ap_queue *vfio_ap_get_queue(int apqn) +{ + struct device *dev; + struct vfio_ap_queue *q; + + dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL, &apqn, + vfio_ap_check_apqn); + if (!dev) + return NULL; + q = dev_get_drvdata(dev); + q->dev = dev; + return q; +} + +/** + * vfio_ap_put_queue: lower device reference count for a queue + * @q: The queue + * + * put the associated device + * + */ +static __attribute__((unused)) void vfio_ap_put_queue(struct vfio_ap_queue *q) +{ + put_device(q->dev); + q->dev = NULL; +} + static void vfio_ap_matrix_init(struct ap_config_info *info, struct ap_matrix *matrix) { diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h index 8836f01..081f0d7 100644 --- a/drivers/s390/crypto/vfio_ap_private.h +++ b/drivers/s390/crypto/vfio_ap_private.h @@ -87,6 +87,7 @@ extern int vfio_ap_mdev_register(void); extern void vfio_ap_mdev_unregister(void); struct vfio_ap_queue { + struct device *dev; int apqn; }; #endif /* _VFIO_AP_PRIVATE_H_ */ -- 2.7.4