Hi there,
Moving from 4.0.4 to 4.0.5, my USB 3.0 controller became practically useless
(and this same issue persists [at least] upto and including 4.1.3).
Here's an excerpt from my syslog demonstrating the problem:
-=-=-
Jun 24 23:15:22 eleven kernel: usb 2-4: new SuperSpeed USB device number 2
using xhci_hcd
Jun 24 23:15:22 eleven kernel: usb 2-4: New USB device found, idVendor=0781,
idProduct=5588
Jun 24 23:15:22 eleven kernel: usb 2-4: New USB device strings: Mfr=1,
Product=2, SerialNumber=3
Jun 24 23:15:22 eleven kernel: usb 2-4: Product: ExtremePro
Jun 24 23:15:22 eleven kernel: usb 2-4: Manufacturer: SanDisk
Jun 24 23:15:22 eleven kernel: usb 2-4: SerialNumber: AA010602150045080168
Jun 24 23:15:22 eleven kernel: usb-storage 2-4:1.0: USB Mass Storage device
detected
Jun 24 23:15:22 eleven kernel: scsi host8: usb-storage 2-4:1.0
Jun 24 23:15:21 eleven mtp-probe[19425]: checking bus 2, device 2:
"/sys/devices/pci0000:00/0000:00:1c.4/0000:03:00.0/usb2/2-4"
Jun 24 23:15:21 eleven mtp-probe[19425]: bus: 2, device: 2 was not an MTP
device
Jun 24 23:15:23 eleven kernel: scsi 8:0:0:0: Direct-Access SanDisk
ExtremePro 0001 PQ: 0 ANSI: 6
Jun 24 23:15:23 eleven kernel: sd 8:0:0:0: [sdi] 250069680 512-byte logical
blocks: (128 GB/119 GiB)
Jun 24 23:15:23 eleven kernel: sd 8:0:0:0: [sdi] Write Protect is off
Jun 24 23:15:23 eleven kernel: sd 8:0:0:0: [sdi] Mode Sense: 53 00 00 08
Jun 24 23:15:23 eleven kernel: sd 8:0:0:0: [sdi] Write cache: disabled, read
cache: enabled, doesn't support DPO or FUA
Jun 24 23:15:23 eleven kernel: sdi: sdi1 sdi2 sdi3 sdi4
Jun 24 23:15:23 eleven kernel: sd 8:0:0:0: [sdi] Attached SCSI removable disk
Jun 24 23:15:23 eleven kernel: dmar: DRHD: handling fault status reg 2
Jun 24 23:15:23 eleven kernel: dmar: DMAR:[DMA Read] Request device [03:00.0]
fault addr fffbd000 \x0aDMAR:[fault reason 06] PTE Read access is not set
Jun 24 23:15:23 eleven kernel: dmar: DRHD: handling fault status reg 2
Jun 24 23:15:23 eleven kernel: dmar: DMAR:[DMA Read] Request device [03:00.0]
fault addr fffbd000 \x0aDMAR:[fault reason 06] PTE Read access is not set
Jun 24 23:15:23 eleven kernel: xhci_hcd 0000:03:00.0: WARNING: Host System
Error
Jun 24 23:16:13 eleven kernel: xhci_hcd 0000:03:00.0: Stopped the command ring
failed, maybe the host is dead
Jun 24 23:16:15 eleven kernel: xhci_hcd 0000:03:00.0: Abort command ring
failed
Jun 24 23:16:15 eleven kernel: xhci_hcd 0000:03:00.0: HC died; cleaning up
Jun 24 23:16:15 eleven kernel: xhci_hcd 0000:03:00.0: Timeout while waiting
for setup device command
Jun 24 23:16:15 eleven kernel: usb 1-1: USB disconnect, device number 2
Jun 24 23:16:15 eleven kernel: usb 2-4: USB disconnect, device number 0
-=-=-
This is a "VIA Technologies, Inc. VL80x xHCI USB 3.0 Controller" inserted
into an older Gigabyte board with Intel Q35 chipset, VT-d enabled...
Looking in ChangeLog-4.0.5 for xhci-related changes gave me 3 hits:
(1) xhci: gracefully handle xhci_irq dead device
commit 948fa13504f80b9765d2b753691ab94c83a10341 upstream.
(2) xhci: Solve full event ring by increasing TRBS_PER_SEGMENT to 256
commit 18cc2f4cbbaf825a4fedcf2d60fd388d291e0a38 upstream.
(3) xhci: fix isoc endpoint dequeue from advancing too far on transaction error
commit d104d0152a97fade389f47635b73a9ccc7295d0b upstream.
The first one seemed fairly irrelevant. The third one mentions DMA, but
looking at the actual changes, I couldn't see an obvious connection to the
'PTE read access' issue. So, I tested reverting the second patch in my
current (4.1.3) kernel and my USB 3.0 controller started working again.
This is good enough for me, but I thought you might want to look more closely
at the root cause, and ensure that the PTE is correctly setup even with the
increased TRBS_PER_SEGMENT.
Kind regards,
--@;
PS
I'd _love_ to help, but I have very little "screen time". I'm lucky
if I can turn on this box once a week... (That's also why it took me
almost 2 months to figure out what the problem was.)
DS
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