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 471CFC43387 for ; Tue, 15 Jan 2019 17:37:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1E90920656 for ; Tue, 15 Jan 2019 17:37:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388451AbfAORhm (ORCPT ); Tue, 15 Jan 2019 12:37:42 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:46766 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730674AbfAORhj (ORCPT ); Tue, 15 Jan 2019 12:37:39 -0500 Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id x0FHZQtQ094084 for ; Tue, 15 Jan 2019 12:37:38 -0500 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2q1hww8d45-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 15 Jan 2019 12:37:38 -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) Tue, 15 Jan 2019 17:37:33 -0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x0FHbW8x62849104 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 15 Jan 2019 17:37:32 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 08B3DAE04D; Tue, 15 Jan 2019 17:37:32 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B88F0AE045; Tue, 15 Jan 2019 17:37:31 +0000 (GMT) Received: from morel-ThinkPad-W530.boeblingen.de.ibm.com (unknown [9.152.224.140]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 15 Jan 2019 17:37:31 +0000 (GMT) From: Pierre Morel To: gerald.schaefer@de.ibm.com Cc: joro@8bytes.org, linux-s390@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, alex.williamson@redhat.com, shameerali.kolothum.thodi@huawei.com, walling@linux.ibm.com Subject: [PATCH v1] iommu/s390: Declare s390 iommu reserved regions Date: Tue, 15 Jan 2019 18:37:30 +0100 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1547573850-9459-1-git-send-email-pmorel@linux.ibm.com> References: <1547573850-9459-1-git-send-email-pmorel@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19011517-4275-0000-0000-000002FF9A96 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19011517-4276-0000-0000-0000380DB8FF Message-Id: <1547573850-9459-2-git-send-email-pmorel@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-01-15_05:,, 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=733 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901150145 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The s390 iommu can only allow DMA transactions between the zPCI device entries start_dma and end_dma. Let's declare the regions before start_dma and after end_dma as reserved regions using the appropriate callback in iommu_ops. Signed-off-by: Pierre Morel --- drivers/iommu/s390-iommu.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c index 22d4db3..5ca91a1 100644 --- a/drivers/iommu/s390-iommu.c +++ b/drivers/iommu/s390-iommu.c @@ -363,6 +363,33 @@ void zpci_destroy_iommu(struct zpci_dev *zdev) iommu_device_sysfs_remove(&zdev->iommu_dev); } +static void s390_get_resv_regions(struct device *dev, struct list_head *head) +{ + struct iommu_resv_region *region; + struct zpci_dev *zdev = to_pci_dev(dev)->sysdata; + + region = iommu_alloc_resv_region(0, zdev->start_dma, + 0, IOMMU_RESV_RESERVED); + if (!region) + return; + list_add_tail(®ion->list, head); + + region = iommu_alloc_resv_region(zdev->end_dma + 1, + ~0UL - zdev->end_dma, + 0, IOMMU_RESV_RESERVED); + if (!region) + return; + list_add_tail(®ion->list, head); +} + +static void s390_put_resv_regions(struct device *dev, struct list_head *head) +{ + struct iommu_resv_region *entry, *next; + + list_for_each_entry_safe(entry, next, head, list) + kfree(entry); +} + static const struct iommu_ops s390_iommu_ops = { .capable = s390_iommu_capable, .domain_alloc = s390_domain_alloc, @@ -376,6 +403,8 @@ static const struct iommu_ops s390_iommu_ops = { .remove_device = s390_iommu_remove_device, .device_group = generic_device_group, .pgsize_bitmap = S390_IOMMU_PGSIZES, + .get_resv_regions = s390_get_resv_regions, + .put_resv_regions = s390_put_resv_regions, }; static int __init s390_iommu_init(void) -- 2.7.4