From nobody Tue Apr 7 14:03:43 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D714C4332F for ; Mon, 17 Oct 2022 12:46:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230397AbiJQMq2 (ORCPT ); Mon, 17 Oct 2022 08:46:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48416 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230301AbiJQMqV (ORCPT ); Mon, 17 Oct 2022 08:46:21 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5AEC4F181; Mon, 17 Oct 2022 05:46:19 -0700 (PDT) Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 29HC57pw020059; Mon, 17 Oct 2022 12:46:07 GMT 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 : mime-version : content-transfer-encoding; s=pp1; bh=NDfNIs/V5yOsnPnb7a+DInix+OEPhJc88G9erUaDEOU=; b=UwPJ5Qa9PFSwYmVbHGvvZ7y2Cm2rHAK/wj3/onW4uw+9ndlVwebdw2aB44FrKCyAfb2K XZzGVAWoT8fvkTY8V10dgzxpX1iLpifdu24BFRxNQU3wdeJgmjK4Eqto2kZ4fjOJjhQZ yUrDZmZfWDi01huNDDCs51El/35zjODh8haHTEU+IDZp4NYds+HLACTjtBVhYUN4Zcdq k4tFx5HENi8mBM+vIoHT4q+iGYNjgoZ2TTawfQpzmLHCtgXHicm51Ud7/+Q1nEOxD0LK 3PGXsZQd/pzFIeXm/AUOH9XzX0Jkt1bSny20BK88hhyHod4hIuK+1HCow19dD7Ka8CCd 2w== Received: from ppma04ams.nl.ibm.com (63.31.33a9.ip4.static.sl-reverse.com [169.51.49.99]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3k944bp15q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Oct 2022 12:46:06 +0000 Received: from pps.filterd (ppma04ams.nl.ibm.com [127.0.0.1]) by ppma04ams.nl.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 29HCZIVA023377; Mon, 17 Oct 2022 12:46:03 GMT Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by ppma04ams.nl.ibm.com with ESMTP id 3k7mg92yrv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Oct 2022 12:46:03 +0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 29HCk0lV262832 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 17 Oct 2022 12:46:00 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6F18F11C05C; Mon, 17 Oct 2022 12:46:00 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F197E11C050; Mon, 17 Oct 2022 12:45:59 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 17 Oct 2022 12:45:59 +0000 (GMT) From: Niklas Schnelle To: iommu@lists.linux.dev, Joerg Roedel , Will Deacon , Robin Murphy , Jason Gunthorpe Cc: Matthew Rosato , Gerd Bayer , Pierre Morel , linux-s390@vger.kernel.org, borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, linux-kernel@vger.kernel.org Subject: [PATCH v7 2/6] iommu/s390: Get rid of s390_domain_device Date: Mon, 17 Oct 2022 14:45:54 +0200 Message-Id: <20221017124558.1386337-3-schnelle@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221017124558.1386337-1-schnelle@linux.ibm.com> References: <20221017124558.1386337-1-schnelle@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Z50lVSmMMxT5wGbXnOMrGlKvmqtpRcTI X-Proofpoint-ORIG-GUID: Z50lVSmMMxT5wGbXnOMrGlKvmqtpRcTI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-17_09,2022-10-17_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 mlxlogscore=999 spamscore=0 mlxscore=0 clxscore=1015 adultscore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210170072 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The struct s390_domain_device serves the sole purpose as list entry for the devices list of a struct s390_domain. As it contains no additional information besides a list_head and a pointer to the struct zpci_dev we can simplify things and just thread the device list through struct zpci_dev directly. This removes the need to allocate during domain attach and gets rid of one level of indirection during mapping operations. Reviewed-by: Matthew Rosato Signed-off-by: Niklas Schnelle Reviewed-by: Jason Gunthorpe --- v5->v6: - On attach failure make sure the IOAT is not registered and zdev->dma_table =3D=3D NULL - Dropped Jason's R-b arch/s390/include/asm/pci.h | 1 + drivers/iommu/s390-iommu.c | 37 +++++++------------------------------ 2 files changed, 8 insertions(+), 30 deletions(-) diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index 108e732d7b14..15f8714ca9b7 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -117,6 +117,7 @@ struct zpci_bus { struct zpci_dev { struct zpci_bus *zbus; struct list_head entry; /* list of all zpci_devices, needed for hotplug,= etc. */ + struct list_head iommu_list; struct kref kref; struct hotplug_slot hotplug_slot; =20 diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c index c2e5e81d609e..af83ccde16a4 100644 --- a/drivers/iommu/s390-iommu.c +++ b/drivers/iommu/s390-iommu.c @@ -29,11 +29,6 @@ struct s390_domain { spinlock_t list_lock; }; =20 -struct s390_domain_device { - struct list_head list; - struct zpci_dev *zdev; -}; - static struct s390_domain *to_s390_domain(struct iommu_domain *dom) { return container_of(dom, struct s390_domain, domain); @@ -87,21 +82,13 @@ static void s390_domain_free(struct iommu_domain *domai= n) static void __s390_iommu_detach_device(struct zpci_dev *zdev) { struct s390_domain *s390_domain =3D zdev->s390_domain; - struct s390_domain_device *domain_device, *tmp; unsigned long flags; =20 if (!s390_domain) return; =20 spin_lock_irqsave(&s390_domain->list_lock, flags); - list_for_each_entry_safe(domain_device, tmp, &s390_domain->devices, - list) { - if (domain_device->zdev =3D=3D zdev) { - list_del(&domain_device->list); - kfree(domain_device); - break; - } - } + list_del_init(&zdev->iommu_list); spin_unlock_irqrestore(&s390_domain->list_lock, flags); =20 zpci_unregister_ioat(zdev, 0); @@ -114,17 +101,12 @@ static int s390_iommu_attach_device(struct iommu_doma= in *domain, { struct s390_domain *s390_domain =3D to_s390_domain(domain); struct zpci_dev *zdev =3D to_zpci_dev(dev); - struct s390_domain_device *domain_device; unsigned long flags; int cc, rc =3D 0; =20 if (!zdev) return -ENODEV; =20 - domain_device =3D kzalloc(sizeof(*domain_device), GFP_KERNEL); - if (!domain_device) - return -ENOMEM; - if (zdev->s390_domain) __s390_iommu_detach_device(zdev); else if (zdev->dma_table) @@ -132,10 +114,8 @@ static int s390_iommu_attach_device(struct iommu_domai= n *domain, =20 cc =3D zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, virt_to_phys(s390_domain->dma_table)); - if (cc) { - rc =3D -EIO; - goto out_free; - } + if (cc) + return -EIO; zdev->dma_table =3D s390_domain->dma_table; =20 spin_lock_irqsave(&s390_domain->list_lock, flags); @@ -151,9 +131,8 @@ static int s390_iommu_attach_device(struct iommu_domain= *domain, rc =3D -EINVAL; goto out_unregister; } - domain_device->zdev =3D zdev; zdev->s390_domain =3D s390_domain; - list_add(&domain_device->list, &s390_domain->devices); + list_add(&zdev->iommu_list, &s390_domain->devices); spin_unlock_irqrestore(&s390_domain->list_lock, flags); =20 return 0; @@ -161,8 +140,6 @@ static int s390_iommu_attach_device(struct iommu_domain= *domain, out_unregister: zpci_unregister_ioat(zdev, 0); zdev->dma_table =3D NULL; -out_free: - kfree(domain_device); =20 return rc; } @@ -206,10 +183,10 @@ static int s390_iommu_update_trans(struct s390_domain= *s390_domain, phys_addr_t pa, dma_addr_t dma_addr, size_t size, int flags) { - struct s390_domain_device *domain_device; phys_addr_t page_addr =3D pa & PAGE_MASK; dma_addr_t start_dma_addr =3D dma_addr; unsigned long irq_flags, nr_pages, i; + struct zpci_dev *zdev; unsigned long *entry; int rc =3D 0; =20 @@ -234,8 +211,8 @@ static int s390_iommu_update_trans(struct s390_domain *= s390_domain, } =20 spin_lock(&s390_domain->list_lock); - list_for_each_entry(domain_device, &s390_domain->devices, list) { - rc =3D zpci_refresh_trans((u64) domain_device->zdev->fh << 32, + list_for_each_entry(zdev, &s390_domain->devices, iommu_list) { + rc =3D zpci_refresh_trans((u64)zdev->fh << 32, start_dma_addr, nr_pages * PAGE_SIZE); if (rc) break; --=20 2.34.1