From patchwork Thu Apr 28 08:07:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niklas Schnelle X-Patchwork-Id: 12830152 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 61FE6C433FE for ; Thu, 28 Apr 2022 08:07:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343877AbiD1ILF (ORCPT ); Thu, 28 Apr 2022 04:11:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233984AbiD1IKr (ORCPT ); Thu, 28 Apr 2022 04:10:47 -0400 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 25A245F8F2; Thu, 28 Apr 2022 01:07:29 -0700 (PDT) Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 23S7jBE9002377; Thu, 28 Apr 2022 08:07:24 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=pp1; bh=P5GSW7S1bGcTV0o4nVQux7Wo07UtirM3gAsmxixkw3o=; b=sHRv7KOIs8uZcsib4SMqQi8jz+8RcDagMGlbGb/d8PqjOlpd9ScIAhDsl12yjPB/UCI9 Hv3WU5HbNkRpYBEtf4xaNK4OgJTUwUfVD8oT9ZylTnfEuAKBVJscwj/vBaS0XC+aEnDh N4i4g+QgfrsccHR9L6kKHfGDl4cxzC0CVTTeho8O/NhtRggCj6/SJhS64uypy4zYGXck GOmI5BK9HFdB1BiIr0uN89mJlWgASvDEqZTERM49ZAiGxfQnhyipg+5HS2UQYC75DbpM ve9tECCXqQhE2ayCTrUsZ7ufA44daQ72QOPgfz4ft4zs7r2XLHKmWxWqrLKvYRJiYph/ /g== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3fqmk7u4y0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 28 Apr 2022 08:07:24 +0000 Received: from m0098421.ppops.net (m0098421.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 23S7ehAa028779; Thu, 28 Apr 2022 08:07:24 GMT Received: from ppma02fra.de.ibm.com (47.49.7a9f.ip4.static.sl-reverse.com [159.122.73.71]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3fqmk7u4x9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 28 Apr 2022 08:07:23 +0000 Received: from pps.filterd (ppma02fra.de.ibm.com [127.0.0.1]) by ppma02fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 23S7ueke006684; Thu, 28 Apr 2022 08:07:22 GMT Received: from b06cxnps4076.portsmouth.uk.ibm.com (d06relay13.portsmouth.uk.ibm.com [9.149.109.198]) by ppma02fra.de.ibm.com with ESMTP id 3fpuyg9k91-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 28 Apr 2022 08:07:22 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 23S87IDa49545654 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 28 Apr 2022 08:07:18 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CAC2C4C044; Thu, 28 Apr 2022 08:07:18 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 899C44C040; Thu, 28 Apr 2022 08:07:18 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 28 Apr 2022 08:07:18 +0000 (GMT) From: Niklas Schnelle To: Bjorn Helgaas , Jan Kiszka , Matthew Rosato , Pierre Morel Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-s390@vger.kernel.org, linux-pci@vger.kernel.org Subject: [PATCH v5 0/4] PCI: Rework pci_scan_slot() and isolated PCI functions Date: Thu, 28 Apr 2022 10:07:14 +0200 Message-Id: <20220428080718.3094464-1-schnelle@linux.ibm.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Amv0XS3eBV8LnTTqsNza-I_OCTb8tSZF X-Proofpoint-ORIG-GUID: OV4Ct2rHkptg9YL5dprTnuiiEJnWYj0M X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-04-27_04,2022-04-27_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 adultscore=0 mlxlogscore=762 phishscore=0 impostorscore=0 suspectscore=0 lowpriorityscore=0 spamscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2204280049 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Hi Bjorn, Hi Jan, In an earlier version[0], I sought to apply the existing jailhouse special case for isolated PCI functions to s390. As Bjorn noted in[1] there appears to be some potential for cleaning things up and removing duplication though. This series attempts to do this cleanup (Patches 1 and 2) followed by enabling isolated PCI functions for s390 (Patches 3 and 4). If need be I can of course split the cleanup off but for now I kept it as one as that's what I have been testing. Testing: - On s390 with SR-IOV and a ConnectX NIC with PF 1 but not PF 0 passed throug i.e. the isolated function case. Also of course with just VFs and an NVMe. - On x86_64 on a desktop system where ARI is disabled and with an SR-IOV NIC with non-contiguous VFs as well as the usual other PCI devices. Thanks, Niklas Changes v4 -> v5: - Remove unintended whitespace change in patch 1 Changes v3 -> v4: - Use a do {} while loop in pci_scan_slot() as it is simpler (Bjorn) - Explicitly check "fn == 0" as it is not a pointer or bool (Bjorn) - Keep the "!dev" check in the ARI branch of next_fn() (Bjorn) - Moved the "fn == 0 && !dev" condition out of next_fn() into pci_scan_slot(). This allows us to keep the "!dev" case in the ARI branch and means there are no new conditions in next_fn() making it easier to verify that its behavior is equivalent to the existing code. - Guard the assignment of dev->multifunction with "fn > 0" instead of "nr > 0". This matches the existing logic more closely and works for the jailhouse case which unconditionally sets dev->multifunction for "fn > 0". This also means fn == 0 is the single "first iteration" test. - Remove some unneeded whitespace in patch 2 Changes v2 -> v3: - Removed now unused nr_devs variable (kernel test robot) Niklas Schnelle (4): PCI: Clean up pci_scan_slot() PCI: Move jailhouse's isolated function handling to pci_scan_slot() PCI: Extend isolated function probing to s390 s390/pci: allow zPCI zbus without a function zero arch/s390/pci/pci_bus.c | 82 ++++++++++---------------------------- drivers/pci/probe.c | 64 +++++++++++++---------------- include/linux/hypervisor.h | 8 ++++ 3 files changed, 55 insertions(+), 99 deletions(-)