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Tue, 01 Sep 2026 05:39:53 -0700 (PDT) X-Received: by 2002:a05:620a:f10:b0:939:216c:59dd with SMTP id af79cd13be357-939287b1e3bmr1525530885a.4.1788266393064; Tue, 01 Sep 2026 05:39:53 -0700 (PDT) Received: from [192.168.202.12] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6a66d052d81sm760433a12.23.2026.09.01.05.39.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Sep 2026 05:39:52 -0700 (PDT) Message-ID: <74c0fc35-a56d-4297-9fcb-23e2df8646c3@oss.qualcomm.com> Date: Tue, 1 Sep 2026 14:39:49 +0200 Precedence: bulk X-Mailing-List: linux-kernel@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: Manivannan Sadhasivam , Manivannan Sadhasivam , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , Qiang Yu , Xilin Wu 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> <178826612782.58092.15490835074765422013.b4-ty@b4> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <178826612782.58092.15490835074765422013.b4-ty@b4> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: _WnhmkuXP8Zl6y5bR_jg9qpc2BH_8abH X-Proofpoint-Spam-Info: AW1haW4tMjYwOTAxMDExMiBTYWx0ZWRfXwEhs/J+ZfJ4E +BiH6t+mjNGvtlB7ns8LQkKJEVnRlLYHxblcVtbzJswDg/uPEcZO1lqQkfU/KcwKOuo/l5mhlIW i8BYDPmeKFANMuyIbpk+b+jQIqLt1i4= X-Proofpoint-ORIG-GUID: _WnhmkuXP8Zl6y5bR_jg9qpc2BH_8abH X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTAxMDExMiBTYWx0ZWRfXxbqatoHQ1q2W ffv7HyJRog/wFPq+8qgqhGk8I21d7iVCYw44lv3PeK0aiX+GQCwWpyIdooYPOZ+/vE5kVoyXqww aZ7AxBpxwjm8L5G63K/arssKViKc1ZnNWavz94vttA4sLcWaH/CtUNGYtevbd3ZdFNl12HYkdf1 VV8N2aXCR0lNl7HiXrb79c0PnzMHIfWztsTrhDIPWl/aUlM+fCIGWbt75zWDjLWRnIZmSFbaZ6f 21gas0tVuPJhv9XB0fYn5/uba9VFVnM/4iOi1VM9MlN53BoA48iC8MsbdcsRxp4On+I33pc2yEb gHwS/4EQI4iJhK0tnCAc/5bcHm4Sx2VdEKlA96ixCEKdDiX/GOduT2iD0E2om9mVJzULjc73XNJ DnlBLvq2zm5i7TkZzHKo9WnvTVnSNEEY6GTUJvCSshGZ3TypudtfNwKg32JucnVk+XHrxWKvqCU IUvvJlDyU0UbYH20mVQ== X-Authority-Analysis: v=2.4 cv=BPWDalQG c=1 sm=1 tr=0 ts=6a96c79a cx=c_pps a=wEM5vcRIz55oU/E2lInRtA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=AFY7VbZHp1LxXVr_yegA:9 a=QEXdDO2ut3YA:10 a=OIgjcC2v60KrkQgK7BGD:22 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=2026-09-01_03,2026-08-31_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 phishscore=0 adultscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609010112 On 9/1/26 2:35 PM, Manivannan Sadhasivam wrote: > > On Wed, 19 Aug 2026 23:36:54 -0700, 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. >> >> Use the controller's ECAM blocker to drop these accesses to the PCIe >> address space as soon as the link-down interrupt fires, so that Completion >> Timeout AERs are reduced. The blocked range covers the entire address >> space (base 0x0, all-ones limit), since the Root Port's own DBI/iATU >> register space remains accessible regardless. >> >> [...] > > Applied, thanks! > > [1/1] PCI: qcom: Block accesses to downstream devices on link down > commit: 86624b718f94517b26f96c1d7beb7632e5562afd Could this be a fix for https://lore.kernel.org/linux-arm-msm/b461c125-947b-4e06-b502-abb354e0cba6@oss.qualcomm.com/ ? (+Xilin) Konrad