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{ "id": 2217743, "url": "http://patchwork.ozlabs.org/api/covers/2217743/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/cover/20260330-fix_pciatops-v7-0-f601818417e8@linux.ibm.com/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "name": "Linux PCI development", "link_name": "linux-pci", "list_id": "linux-pci.vger.kernel.org", "list_email": "linux-pci@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260330-fix_pciatops-v7-0-f601818417e8@linux.ibm.com>", "list_archive_url": null, "date": "2026-03-30T13:09:43", "name": "[v7,0/3] PCI: AtomicOps: Fix pci_enable_atomic_ops_to_root()", "submitter": { "id": 85804, "url": "http://patchwork.ozlabs.org/api/people/85804/?format=api", "name": "Gerd Bayer", "email": "gbayer@linux.ibm.com" }, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/cover/20260330-fix_pciatops-v7-0-f601818417e8@linux.ibm.com/mbox/", "series": [ { "id": 498027, "url": "http://patchwork.ozlabs.org/api/series/498027/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=498027", "date": "2026-03-30T13:09:44", "name": "PCI: AtomicOps: Fix pci_enable_atomic_ops_to_root()", "version": 7, "mbox": "http://patchwork.ozlabs.org/series/498027/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2217743/comments/", "headers": { "Return-Path": "\n <linux-pci+bounces-51451-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=A8dcuJU8;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.232.135.74; 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d=ibm.com; h=cc\n\t:content-transfer-encoding:content-type:date:from:message-id\n\t:mime-version:subject:to; s=pp1; bh=3I35eUYlAKW8mFUQ9C7xezobrVjM\n\tL+hOrP3NDrhy/V0=; b=A8dcuJU8+ltGZb7otEjoZwO3xhvhsT1+NnaC/bdUtqkx\n\tI8F4rp8ESWPSsTdNibL9AHGfeHPyUdA9SgQI5ddNL8flxOz/FPb8h75AZfjhYsQf\n\t7ElGOsV0w7fYEUEM6g9Yz0OtT/2bw7qEVl1Zx3XSgiglBMft64rrzQMDfeaaCpwU\n\tiyzUz2KL5EMRgZ0BEgUy8HqMa9BtYRAxM3wLELELVh6ioWyCPCn0F3skW9bUFVbr\n\tnnJg3aQxR0yjIHZtACjlzQpq2dzuaH9v5JR1fM+k2XGdKiB/yTPA0AljjrM3iE9k\n\tkUwFXdIadVmOUKGVRlBhZmIyzMfiF/behaXJWZPRGQ==", "From": "Gerd Bayer <gbayer@linux.ibm.com>", "Subject": "[PATCH v7 0/3] PCI: AtomicOps: Fix pci_enable_atomic_ops_to_root()", "Date": "Mon, 30 Mar 2026 15:09:43 +0200", "Message-Id": "<20260330-fix_pciatops-v7-0-f601818417e8@linux.ibm.com>", "Precedence": "bulk", "X-Mailing-List": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "X-B4-Tracking": "v=1; b=H4sIABd2ymkC/23P3WrDMAwF4Fcpvl6KZdV23Ku9xyjDP8pqWJMQt\n 6aj5N3nlI1lJpdH4nxID5ZoipTYcfdgE+WY4tCXoF92zJ9t/0FNDCUzwYUE4Krp4v199NFehzE\n 1mlrFW/LecWSlMk5U9k/u7VTyOabrMH099QzL9AcC/h/K0PCGgpetldopQa+fsb/d99Fd9n64s\n AXL4g8QUF2SRQECByTjNAnaBPAXUBzrVzIWwJgAwnnbOTBbwGEFAFbAYQHQec2tQoNyC5ArQNS\n ALEBng9UC0ZJttwC1BmQFqAIAdx2YoFUIUAPzPH8DARsnr/EBAAA=", "X-Change-ID": "20251106-fix_pciatops-7e8608eccb03", "To": "Bjorn Helgaas <bhelgaas@google.com>, Jay Cornwall <Jay.Cornwall@amd.com>,\n Felix Kuehling <Felix.Kuehling@amd.com>,\n =?utf-8?q?Ilpo_J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com>,\n Christian Borntraeger <borntraeger@linux.ibm.com>,\n Niklas Schnelle <schnelle@linux.ibm.com>", "Cc": "Gerald Schaefer <gerald.schaefer@linux.ibm.com>,\n Heiko Carstens <hca@linux.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>,\n Alexander Gordeev <agordeev@linux.ibm.com>,\n Sven Schnelle <svens@linux.ibm.com>,\n Leon Romanovsky <leon@kernel.org>,\n Alexander Schmidt <alexs@linux.ibm.com>, linux-s390@vger.kernel.org,\n linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,\n netdev@vger.kernel.org, linux-rdma@vger.kernel.org,\n Gerd Bayer <gbayer@linux.ibm.com>, stable@vger.kernel.org", "X-Mailer": "b4 0.14.2", "X-TM-AS-GCONF": "00", "X-Proofpoint-Reinject": "loops=2 maxloops=12", "X-Authority-Analysis": "v=2.4 cv=J6enLQnS c=1 sm=1 tr=0 ts=69ca762f cx=c_pps\n a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17\n a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VwQbUJbxAAAA:8\n a=VnNF1IyMAAAA:8 a=7zwmxoYQV6rCx-UIAC4A:9 a=QEXdDO2ut3YA:10", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMzMwMDEwMCBTYWx0ZWRfXxJEenwXwTeIx\n IOX1S2sBdyQms61MrmkjxMjuHsK+3wzYuTn5896QffYl1NT+ZuBc6/f21x7bA/Zbdn0igVRZ/vh\n DZi3V5UTaZI7BhmsMBoLCPK5CaqM1c33mdDgUcL+XYowE5zKH25zba9ljJBi3VcIXeBJsKXndFU\n zDNyF8t+CJ9p5IRF96ebwB1/3cqiOban3pFXSzy/MZsnP8+f0/4b6vs2G7oWg0h6lpL3RaFgJQ6\n e6Eht8vzv8YdQDe6GrWRl/OurBvQSfy5fiGWWpxiSCPja5VvKdgbPyBBU+Sn44VWh82CSI/9fxV\n 2iaj9fg5nBICM66VUheWvldeLqijVm99WjAaVL3sLzl2TsXTpg6t3m8aAxxpHI9IafofJSWp+Pa\n x9s21qZ2yu7WmPTixq/ZDyRaYwj5PWt9284Mu5ubvPiMX6qTk8tzRIu3VQgQsxY0yob10MKnda8\n g5YJHxCPedQG9WksPyQ==", "X-Proofpoint-GUID": "2jPg5nYGLv5jPOt00D2_nVxs-3Vtxl6M", "X-Proofpoint-ORIG-GUID": "hFI6YSonbms8A70CRRFvdbqptKdyt-B7", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-03-29_05,2026-03-28_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n suspectscore=0 clxscore=1015 adultscore=0 priorityscore=1501 bulkscore=0\n phishscore=0 malwarescore=0 lowpriorityscore=0 spamscore=0 impostorscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603300100" }, "content": "Hi Bjorn et al.\n\nOn s390, AtomicOp Requests are enabled on a PCI function that supports\nthem, despite the helper being ignorant about the root port's capability\nto supporting their completion.\n\nPatch 1: Do not enable AtomicOps Requests on RCiEPs\nPatch 2: Fix the logic in pci_enable_atomic_ops_to_root()\nPatch 3: Update references to PCIe spec in that function.\n\nI did test that the issue is fixed with these patches. Also, I verified\nthat on a Mellanox/Nvidia ConnectX-6 adapter plugged straight into the\nroot port of a x86 system still gets AtomicOp Requests enabled.\n\nDue to a lack of the required hardware, I did not test this with any PCIe\nswitches between root port and endpoint. So test exposure in other\nenvironments is highly appreciated.\n\nSigned-off-by: Gerd Bayer <gbayer@linux.ibm.com>\n---\nChanges in v7:\n- Prepend series with a patch to explicitly exclude RCiEPs from\n enablement of AtomicOps Requests\n- Limit the core patch 2 to enforce a full check of the entire\n PCIe hierarchy for support of AtomicOps capabilities.\n- Rebase to v7.0-rc6\n- Link to v6: https://lore.kernel.org/r/20260325-fix_pciatops-v6-0-10bf19d76dd1@linux.ibm.com\n\nChanges in v6:\n- Incorporate Ilpo's editorial comments.\n- Correct logic in pci_is_atomicops_capable_rp() (annotated by Sashiko)\n- Link to v5: https://lore.kernel.org/r/20260323-fix_pciatops-v5-0-fada7233aea8@linux.ibm.com\n\nChanges in v5:\n- Introduce new pcibios_connects_to_atomicops_capable_rc() so arch's can\n declare AtomicOps support outside of PCIe config space. Defaults to\n \"true\" - except s390.\n- rebase to 7.0-rc5\n- Link to v4: https://lore.kernel.org/r/20260313-fix_pciatops-v4-0-93bc70a63935@linux.ibm.com\n\nChanges in v4:\n- drop patch 1 - it will become the base of a new series\n- previous patch 2, now 1: reword commit message\n- add a new patch to update references to PCI spec within\n pci_enable_atomic_ops_to_root()\n- rebase to latest master\n- Link to v3: https://lore.kernel.org/r/20260306-fix_pciatops-v3-0-99d12bcafb19@linux.ibm.com\n\nChanges in v3:\n- rebase to 7.0-rc2\n- gentle ping\n- add netdev and rdma lists for awareness\n- Link to v2: https://lore.kernel.org/r/20251216-fix_pciatops-v2-0-d013e9b7e2ee@linux.ibm.com\n\nChanges in v2:\n- rebase to 6.19-rc1\n- otherwise unchanged to v1\n- Link to v1: https://lore.kernel.org/r/20251110-fix_pciatops-v1-0-edc58a57b62e@linux.ibm.com\n\n---\nGerd Bayer (3):\n PCI: AtomicOps: Do not enable requests by RCiEPs\n PCI: AtomicOps: Do not enable without support in root port\n PCI: AtomicOps: Update references to PCIe spec\n\n drivers/pci/pci.c | 48 ++++++++++++++++++++++++++----------------------\n 1 file changed, 26 insertions(+), 22 deletions(-)\n---\nbase-commit: 7aaa8047eafd0bd628065b15757d9b48c5f9c07d\nchange-id: 20251106-fix_pciatops-7e8608eccb03\n\nBest regards," }