[+cc Borislav, Alan, Marcel, Johan, linux-usb, LKML] On Tue, Apr 02, 2019 at 08:09:25AM -0500, Bjorn Helgaas wrote: > On Thu, Mar 28, 2019 at 09:22:03PM -0400, Ron Murray wrote: > > I have an ASRock 970A-G/3.1 motherboard, which, with current Linux > > kernels, occasionally "finds" an extra PCI device on the initial > > scan. > > Hmmm, I don't have any good ideas. You mention "current" kernels. Is > this a regression? If there is an earlier kernel that never finds > this extra device, it's possible we could find the problem by > bisecting. It's a little harder with intermittent problems like this, > though. > > Is there any rhyme or reason to when the problem occurs? Do you dual > boot with Windows? Does it happen after an unusual shutdown (crash, > oops, etc)? Is there anything connected to that port? > > Can you collect the output of "sudo lspci -vvv" and the dmesg logs for > successful and failing boots? Maybe attach them to a > bugzilla.kernel.org entry. The bugzilla entry is https://bugzilla.kernel.org/show_bug.cgi?id=203157 Thanks, Ron! I unpacked the tar file and attached the individual files. I think they might be labeled backwards, though. Compared to lspci-vvv.good, lspci-vvv.bad contains two extra devices: 00:09.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890/RD9x0/RX980 PCI to PCI bridge (PCI Express GPP Port 4) 02:00.0 USB controller: ASMedia Technology Inc. ASM1143 USB 3.1 Host Controller The 00:09.0 bridge leads to bus 02, i.e., to the XHCI USB device. Obviously if we don't find the bridge, we won't find the USB device either. Is there anything you can relate to the USB device? I assume it's not something like "the USB controller appears only when there's a USB device connected to it"? No flaky USB device connected (low battery or something)? Looking at USB, I see this weirdness: $ grep "BCM\|000272C95496" dmesg.* dmesg.bad:usb 4-2: Product: BCM20702A0 dmesg.bad:usb 4-2: SerialNumber: 000272C95496 dmesg.bad:Bluetooth: hci0: BCM: chip id 63 dmesg.bad:Bluetooth: hci0: BCM: features 0x07 dmesg.bad:Bluetooth: hci0: BCM20702A dmesg.bad:Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000 dmesg.bad:Bluetooth: hci0: BCM20702A1 (001.002.014) build 1338 dmesg.good:usb 4-2: Product: BCM920702 Bluetooth 4.0 dmesg.good:usb 4-2: SerialNumber: 000272C95496 dmesg.good:Bluetooth: hci0: BCM: chip id 63 dmesg.good:Bluetooth: hci0: BCM: features 0x07 dmesg.good:Bluetooth: hci0: BCM20702A1 (001.002.014) build 1338 dmesg.good:Bluetooth: hci0: BCM20702A1 (001.002.014) build 1338 Looks like the same device, but for some reason it identifies differently. Added some Bluetooth guys in case they have an idea; I sure don't. > > I wouldn't mind, but it finds it early in the piece, and that > > changes the PCI allocation of my Ethernet board from 02:06.0 to > > 03:06.0, and, with systemd, Linux comes up with no network > > connection. A reboot fixes it, mostly. > > > > Here's the first few lines of 'lspci' when Linux doesn't find the > > extra device > > > > > 00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD9x0/RX980 Host Bridge (rev 02) > > > 00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD/ATI] RD890S/RD990 I/O Memory Management Unit (IOMMU) > > > 00:02.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890/RD9x0/RX980 PCI to PCI bridge (PCI Express GFX port 0) > > > 00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode] (rev 40) > > > > and here's the same thing when it does: > > > > > 00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD9x0/RX980 Host Bridge (rev 02) > > > 00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD/ATI] RD890S/RD990 I/O Memory Management Unit (IOMMU) > > > 00:02.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890/RD9x0/RX980 PCI to PCI bridge (PCI Express GFX port 0) > > > 00:09.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890/RD9x0/RX980 PCI to PCI bridge (PCI Express GPP Port 4) > > > 00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode] (rev 40) > > > 00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller > > > > The 00:09.0 device is the extra one. Anything else I can provide to assist?
