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Thu, 20 Aug 2026 04:29:35 -0700 (PDT) X-Received: by 2002:ac8:5d08:0:b0:51b:f40b:2faf with SMTP id d75a77b69052e-52dd5cf7f84mr81389421cf.4.1787225374978; Thu, 20 Aug 2026 04:29:34 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6a3feec9e2esm1942826a12.5.2026.08.20.04.29.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Aug 2026 04:29:33 -0700 (PDT) Message-ID: Date: Thu, 20 Aug 2026 13:29:30 +0200 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] PCI: qcom: Block accesses to downstream devices on link down To: Qiang Yu , Manivannan Sadhasivam , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260819-ecam_blocker-v2-1-e7a8fdc1c5cb@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260819-ecam_blocker-v2-1-e7a8fdc1c5cb@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwODIwMDA4NSBTYWx0ZWRfX5GaCxs0OJsAM O6QOdpSxWzADGd6/L7VFETJE2yRxC6xmoXl13R7McvojRaluCbnmyCRBefJqb3SL78HkJTWesoO yqQV7U8G6d/eY80pIO9xMpkkXN0dhWU= X-Authority-Analysis: v=2.4 cv=YP+vDxGx c=1 sm=1 tr=0 ts=6a86e520 cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=J8a1EZ1zYi-ZQbc0NmkA:9 a=QEXdDO2ut3YA:10 a=zZCYzV9kfG8A:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-ORIG-GUID: 0xgGa50sLGjOsa5FbnLG0308wkoK43fl X-Proofpoint-GUID: 0xgGa50sLGjOsa5FbnLG0308wkoK43fl X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODIwMDA4NSBTYWx0ZWRfX5nVdiitEleux wAFLOqN8aspf+eEMa54AssAvNbluUqGGqXqMiee5pyZMsBB7I/VLxtpSe/6jhyBX85ux66FWQgu RRMETIZApnV4hlNp7YB5qS1dOyOsq4T+glgUq/gJ/mdGB+Q3TN6wlnSVOkfQ/UsWzwb2eUKN23M yd8wssoQBDg3/SXqg8AwHAKhlC6twOHwGh/HHyKBdh56pl+izvOrORvR8GN2CEzj+0n/wAZ2Srd GkuotdMBKnlwIXmI6AyXpbt7Fudj+Z7g82G8d7HLRDe6dQWtInOMpo7mM9izDmbbqfrocqSonWh hMw1Bwe+rTRdfLxQRUxCUnzclYdxuSN8uZxubLIFB87PyE4+7J3oGuFbcrgM2LhiVWrBSIyc3XS aef2QmI+tgwEwvN83nDysxbjDzRtyL64hjMRDeTWp5iSNoqaFZAF34bbW03285GCwW7TyXgiEN4 J0f2GeVOiKigF32ZabQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-19_06,2026-08-19_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 bulkscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 clxscore=1015 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608200085 On 8/20/26 8:36 AM, Qiang Yu wrote: > After a PCIe link goes down, software may still access the BAR (MMIO) > space or configuration space of devices behind that link before recovery > has run. As the link is down, these accesses never complete, resulting in > a storm of Completion Timeout AERs. [...] > static int qcom_pcie_host_init(struct dw_pcie_rp *pp) > { > struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > @@ -1775,13 +1832,15 @@ static int qcom_pcie_reset_root_port(struct pci_host_bridge *bridge, > u32 val; > int ret; > > + mutex_lock(&pcie->hw_lock); guard(mutex)(&pcie->hw_lock) This decreases the number of AERs I see while de-authorizing the PCIe link on a TBT3 connection to an ASUS PA27AC monitor from "a whole lot" to just 1 on X1E80100 CRD Tested-by: Konrad Dybcio # X1E80100 CRD + ASUS PA27AC Konrad