Received: by 2002:a05:6359:c8b:b0:c7:702f:21d4 with SMTP id go11csp686732rwb; Fri, 7 Oct 2022 02:51:50 -0700 (PDT) X-Google-Smtp-Source: AMsMyM5O02hru1KN/lxdyTfNXTsHA41wmfgXuN7tDAa+kTs3zMnr0MykAIJKoOtXa1yT08BQCCxd X-Received: by 2002:a63:64b:0:b0:456:f61d:7041 with SMTP id 72-20020a63064b000000b00456f61d7041mr3830136pgg.445.1665136310080; Fri, 07 Oct 2022 02:51:50 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1665136310; cv=none; d=google.com; s=arc-20160816; b=cYvOPAsZusMagVpApPPJ/mZ4JFaKZEda1agPgH1RwzYq8GM6qKG6DXOzHUPx1nTJvr bTrtgl2l1vl0bV5+pmkLBskbHddUqob8f16/KaBxLTdhz1Ru2wHV0gSdD3vjjypnZDeH GaCEfb6qw6uAaTOq06ahFMoEFg+psN9KGQnddfVVtqJLsFTF0RNyKx2Q1Z6b7hTIM2o3 3A3CLD1HDRrBUeYjKJdkiNseph8Noew9Vcpp8NAh/BqFuyPMwkL/cFrC5oqKjkLhq0G5 YOs8NiLsLAILzXsLBKkefqSID2IVWvN4DTXiDSGzXIsq+9lJS9ec631stBtfsxhL7XPR 5dmQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=eiv4fa9LQYx/DHFqzsQokv7TRRJkGniPK07zniwRYrU=; b=qQxtFzIMNQpRlM51izWVaFLZEhFRs20Tau4QvK1v5DigxFb9pQok9rPSVr4rO5Jgh4 +hOD9qxV5X7fmn3uR8QQWt2p/bdEifKwVttBHfquoOC9aX6yAKgmbg1B/0WR0x4iR9Y4 ohnLwSdd8yDEWgWSbNts8NYu0SxOkcraKR7N1bMI7Nyd5gxokcdvxayuSKVhRVfvlx+y XvFLwSU0omztShDRsLdbOm0s2QaELLxRU0Lo4Ta2ezSxy12qHS7LfASdTiFJt/AVLSdb XzqdbHAqa3f5QczjfoMzL1H3dslfRJsfYDelHE7v3EEhpJv3FGHQSRllWSeiq23S/6st 84ug== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ibm.com header.s=pp1 header.b="W2/T7OW2"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id i3-20020a17090adc0300b0020b020b98a1si1853461pjv.36.2022.10.07.02.51.36; Fri, 07 Oct 2022 02:51:50 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@ibm.com header.s=pp1 header.b="W2/T7OW2"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229652AbiJGJub (ORCPT + 99 others); Fri, 7 Oct 2022 05:50:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46624 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229479AbiJGJu0 (ORCPT ); Fri, 7 Oct 2022 05:50:26 -0400 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 805B99082D; Fri, 7 Oct 2022 02:50:24 -0700 (PDT) Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 2979nodW039002; Fri, 7 Oct 2022 09:50:13 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=eiv4fa9LQYx/DHFqzsQokv7TRRJkGniPK07zniwRYrU=; b=W2/T7OW2S92uGX/WyiLm/3dULAY38BX5+F8ncJNChD8LXUiQ+9lklqy4HZWuPlvMg2GD c/yJtDYEBgm5QEj3Z6S8OQnihzqP/FcYB9qFxr9DesNS5CNyLQ51xeYPnTnKERDAShYB YUcU+aCq6CE5h21GzphX2EHWY+09lD3NnSsP9jNb7emdaPOoh3oCpG3lbIkxwy9PG/1I VgCNQbR1woEiblGhDLt4zXVMVRZ8MQVzr+Vb0D+0ZDumcEP/dks15w50hXrUmrMNIyPs WTju04mN3LpRd3J8CbwgLEPT7eRrymZmiITdYrHtHWuRUcJxFlgqXkdF4+ZtUcHjSq0P 3A== 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 3k2hty80bj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 07 Oct 2022 09:50:12 +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 2979aUof006710; Fri, 7 Oct 2022 09:50:11 GMT Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by ppma04ams.nl.ibm.com with ESMTP id 3jxd698dqn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 07 Oct 2022 09:50:10 +0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 2979o71p918132 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 7 Oct 2022 09:50:07 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 53D99A4040; Fri, 7 Oct 2022 09:50:07 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D83ECA4051; Fri, 7 Oct 2022 09:50:06 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 7 Oct 2022 09:50:06 +0000 (GMT) From: Niklas Schnelle To: Matthew Rosato , Pierre Morel , iommu@lists.linux.dev Cc: 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, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, jgg@nvidia.com, linux-kernel@vger.kernel.org Subject: [PATCH v6 2/6] iommu/s390: Get rid of s390_domain_device Date: Fri, 7 Oct 2022 11:50:01 +0200 Message-Id: <20221007095005.2017126-3-schnelle@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221007095005.2017126-1-schnelle@linux.ibm.com> References: <20221007095005.2017126-1-schnelle@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: O1AxhZpoAGfNlHVOh7MDM_Dntdoht2AA X-Proofpoint-ORIG-GUID: O1AxhZpoAGfNlHVOh7MDM_Dntdoht2AA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-10-06_05,2022-10-06_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 bulkscore=0 suspectscore=0 clxscore=1015 spamscore=0 impostorscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 mlxlogscore=999 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210070058 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- v5->v6: - Drop Jason's R-b as he didn't explicitly extend it for the rollback change 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; diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c index 96173cfee324..399c31b97f65 100644 --- a/drivers/iommu/s390-iommu.c +++ b/drivers/iommu/s390-iommu.c @@ -29,11 +29,6 @@ struct s390_domain { spinlock_t list_lock; }; -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 *domain) static void __s390_iommu_detach_device(struct zpci_dev *zdev) { struct s390_domain *s390_domain = zdev->s390_domain; - struct s390_domain_device *domain_device, *tmp; unsigned long flags; if (!s390_domain) return; spin_lock_irqsave(&s390_domain->list_lock, flags); - list_for_each_entry_safe(domain_device, tmp, &s390_domain->devices, - list) { - if (domain_device->zdev == zdev) { - list_del(&domain_device->list); - kfree(domain_device); - break; - } - } + list_del_init(&zdev->iommu_list); spin_unlock_irqrestore(&s390_domain->list_lock, flags); zpci_unregister_ioat(zdev, 0); @@ -114,17 +101,12 @@ static int s390_iommu_attach_device(struct iommu_domain *domain, { struct s390_domain *s390_domain = to_s390_domain(domain); struct zpci_dev *zdev = to_zpci_dev(dev); - struct s390_domain_device *domain_device; unsigned long flags; int cc, rc = 0; if (!zdev) return -ENODEV; - domain_device = 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_domain *domain, cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, virt_to_phys(s390_domain->dma_table)); - if (cc) { - rc = -EIO; - goto out_free; - } + if (cc) + return -EIO; zdev->dma_table = s390_domain->dma_table; spin_lock_irqsave(&s390_domain->list_lock, flags); @@ -151,9 +131,8 @@ static int s390_iommu_attach_device(struct iommu_domain *domain, rc = -EINVAL; goto out_unregister; } - domain_device->zdev = zdev; zdev->s390_domain = 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); 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 = NULL; -out_free: - kfree(domain_device); return rc; } @@ -201,10 +178,10 @@ 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 = pa & PAGE_MASK; dma_addr_t start_dma_addr = dma_addr; unsigned long irq_flags, nr_pages, i; + struct zpci_dev *zdev; unsigned long *entry; int rc = 0; @@ -229,8 +206,8 @@ static int s390_iommu_update_trans(struct s390_domain *s390_domain, } spin_lock(&s390_domain->list_lock); - list_for_each_entry(domain_device, &s390_domain->devices, list) { - rc = zpci_refresh_trans((u64) domain_device->zdev->fh << 32, + list_for_each_entry(zdev, &s390_domain->devices, iommu_list) { + rc = zpci_refresh_trans((u64)zdev->fh << 32, start_dma_addr, nr_pages * PAGE_SIZE); if (rc) break; -- 2.34.1