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Mon, 30 Mar 2026 13:10:02 +0000 (GMT) From: Gerd Bayer Date: Mon, 30 Mar 2026 15:09:44 +0200 Subject: [PATCH v7 1/3] PCI: AtomicOps: Do not enable requests by RCiEPs Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260330-fix_pciatops-v7-1-f601818417e8@linux.ibm.com> References: <20260330-fix_pciatops-v7-0-f601818417e8@linux.ibm.com> In-Reply-To: <20260330-fix_pciatops-v7-0-f601818417e8@linux.ibm.com> To: Bjorn Helgaas , Jay Cornwall , Felix Kuehling , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Christian Borntraeger , Niklas Schnelle Cc: Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sven Schnelle , Leon Romanovsky , Alexander Schmidt , linux-s390@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-rdma@vger.kernel.org, Gerd Bayer X-Mailer: b4 0.14.2 X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: nR_7MWUNmRcBNJwufyVy4G_yWkey58SG X-Authority-Analysis: v=2.4 cv=KslAGGWN c=1 sm=1 tr=0 ts=69ca762f cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=l8ywxVsZnL7a6Sv94yEA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzMwMDEwMCBTYWx0ZWRfX2sq8oqfMVQA+ YeBcz7oajtbLWPeE9dkM/BaFYthp6zT+ff9iEmmOX9AsLPLOf8TXoicBR8gPeDxDDsk5qyG5Frb VYL2l3eO0/k9pnW7LICm0O+TqhI9UXcWctZuOshqgoqipqfECUH8e830QOZRSBiZvo2UMm25Jhs YOc7AKGL0BPBIC8D2N7dkf7yqxl3iWX37t3KPrUu/u6G32QWM4bxrVimZ2AT17/IKoCR9LAvQoR ezfqlbZgXCLCew2how5IZUefljiZaXfdiiuMmrzrCqoE6oqsNvPIv2meOCOv1OsUV74F0zI4yKx cKOHkNypn0M+al4GxQEGlUVFA1t4D5Da7KUf4zjrIvG5VoAfUI1s11heAaFizpajFSSQB5cAB5i G+rb4kv2yrDtwr6ZXOn00uV/UnggzT6TAvEI3b3x1PKGsjfyrTYeZkv+nWXcUpYz/Y0VBFvBHqd Fm9OovqYqPLfnXxpTpw== X-Proofpoint-ORIG-GUID: P-slp7YBInZbi8orMA2p2Lc-oqwdirtq X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-29_05,2026-03-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 impostorscore=0 clxscore=1015 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603300100 Since root complex integrated end points (RCiEPs) attach to a bus that has no bridge device describing the root port, the capability to complete AtomicOps requests cannot be determined with PCIe methods. Change default of pci_enable_atomic_ops_to_root() to not enable AtomicOps requests on RCiEPs. Signed-off-by: Gerd Bayer --- drivers/pci/pci.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 8479c2e1f74f1044416281aba11bf071ea89488a..135e5b591df405e87e7f520a618= d7e2ccba55ce1 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3692,15 +3692,14 @@ int pci_enable_atomic_ops_to_root(struct pci_dev *d= ev, u32 cap_mask) =20 /* * Per PCIe r4.0, sec 6.15, endpoints and root ports may be - * AtomicOp requesters. For now, we only support endpoints as - * requesters and root ports as completers. No endpoints as + * AtomicOp requesters. For now, we only support (legacy) endpoints + * as requesters and root ports as completers. No endpoints as * completers, and no peer-to-peer. */ =20 switch (pci_pcie_type(dev)) { case PCI_EXP_TYPE_ENDPOINT: case PCI_EXP_TYPE_LEG_END: - case PCI_EXP_TYPE_RC_END: break; default: return -EINVAL; --=20 2.51.0