https://bugzilla.kernel.org/show_bug.cgi?id=202055 --- Comment #19 from Dongli Zhang (dongli.zhang@xxxxxxxxxx) --- (In reply to Alex Williamson from comment #14) > Hi Dongli, you're getting an ACS violation, I wonder if it's related to an > issue your colleague resolved recently: > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ > ?id=aa667c6408d20a84c7637420bc3b7aa0abab59a2 > > Is there an IDT switch in your topology or is the NVMe drive connected > directly to the Intel root port? If the former, perhaps James' patch > doesn't account for the invalid source ID propagating upstream. If directly > connected to the Intel root port, perhaps IDT isn't the only downstream port > with the issue. > > You could try disabling Source Validation on the root port via setpci to see > if we're dealing with a similar issue: > > # setpci -s 1b.0 ECAP_ACS+6.w=0:1 > > However, you're using an Intel system with a non-standard (aka broken) ACS > capability, therefore the ACS capability and control registers are actually > dwords, so I think the correct command would be: > > # setpci -s 1b.0 ECAP_ACS+8.l=0:1 > > Also you won't be able to trust lspci for decoding of the ACS capability. Hi Alex, The kernel I use is the most recent upstream version including commit aa667c6408d20a84c7637420bc3b7aa0abab59a2. Is there a way to know if IDT switch is in the topology? The env is an dell desktop I use at home to debug program myself. # lspci 00:00.0 Host bridge: Intel Corporation Device 591f (rev 05) 00:02.0 VGA compatible controller: Intel Corporation Device 5912 (rev 04) 00:14.0 USB controller: Intel Corporation Device a2af 00:14.2 Signal processing controller: Intel Corporation Device a2b1 00:16.0 Communication controller: Intel Corporation Device a2ba 00:17.0 SATA controller: Intel Corporation Device a282 00:1b.0 PCI bridge: Intel Corporation Device a2e7 (rev f0) 00:1d.0 PCI bridge: Intel Corporation Device a298 (rev f0) 00:1f.0 ISA bridge: Intel Corporation Device a2c6 00:1f.2 Memory controller: Intel Corporation Device a2a1 00:1f.3 Audio device: Intel Corporation Device a2f0 00:1f.4 SMBus: Intel Corporation Device a2a3 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (5) I219-V 01:00.0 Non-Volatile memory controller: Intel Corporation Device f1a6 (rev 03) 02:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01) 02:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01) Dongli Zhang -- You are receiving this mail because: You are watching the assignee of the bug.
