[Bug 215906] DMAR fault when connected usb hub (xhci_hcd)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215906

--- Comment #27 from Rolf Reintjes (lists.rolf@reintjes.nrw) ---
(In reply to Michał Pecio from comment #26)
> Honestly, I don't know what's the problem. Maybe as a last ditch effort try
> dynamic debug, if your kernel supports it:
> 
> echo 'func xhci_dbg_trace +p' >/proc/dynamic_debug/control
> rmmod xhci-pci
> modprobe xhci-pci
> echo 'func xhci_dbg_trace -p' >/proc/dynamic_debug/control
> dmesg |grep 'page size'
> [  262.117753] xhci_hcd 0000:08:00.0: Supported page size register = 0x1
> [  262.117755] xhci_hcd 0000:08:00.0: Supported page size of 8K
> [  262.117756] xhci_hcd 0000:08:00.0: HCD page size set to 4K
> 
> BTW, don't worry about that 8K, this value is incorrectly calculated and
> then completely ignored.

rolf@i7-5820K-debian-testing1:~$ sudo dmesg |grep 'page size'
[    0.189774] HugeTLB: registered 1.00 GiB page size, pre-allocated 0 pages
[    0.189774] HugeTLB: registered 2.00 MiB page size, pre-allocated 0 pages
[  225.577885] xhci_hcd 0000:00:14.0: Supported page size register = 0x1
[  225.577887] xhci_hcd 0000:00:14.0: Supported page size of 8K
[  225.577888] xhci_hcd 0000:00:14.0: HCD page size set to 4K
[  225.584545] xhci_hcd 0000:05:00.0: Supported page size register = 0x1
[  225.584547] xhci_hcd 0000:05:00.0: Supported page size of 8K
[  225.584548] xhci_hcd 0000:05:00.0: HCD page size set to 4K
[  225.648450] xhci_hcd 0000:06:00.0: Supported page size register = 0x1
[  225.648452] xhci_hcd 0000:06:00.0: Supported page size of 8K
[  225.648453] xhci_hcd 0000:06:00.0: HCD page size set to 4K

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