Hello.
lspci -vvv show irq 11 for the device but cat/proc/interrupts show
interrupts 16 and 17 for xhci_hcd but my pc only has interrupts 0 to
15
Can that be the mistake?
cat /proc/interrupts
CPU0
0: 32949 XT-PIC timer
1: 433 XT-PIC i8042
2: 0 XT-PIC cascade
4: 1 XT-PIC uhci_hcd:usb1, enp0s9
6: 3 XT-PIC floppy
8: 0 XT-PIC rtc0
9: 0 XT-PIC acpi
10: 1633 XT-PIC radeon
12: 27377 XT-PIC i8042
14: 798 XT-PIC ata_piix
15: 76817 XT-PIC ata_piix, pata_pdc2027x[0000:00:0e.0], enp0s10
16: 0 PCI-MSI 1048576-edge xhci_hcd
17: 0 PCI-MSI 1048577-edge xhci_hcd
NMI: 97 Non-maskable interrupts
LOC: 66408 Local timer interrupts
SPU: 0 Spurious interrupts
PMI: 97 Performance monitoring interrupts
IWI: 3 IRQ work interrupts
RTR: 0 APIC ICR read retries
RES: 0 Rescheduling interrupts
CAL: 0 Function call interrupts
TLB: 0 TLB shootdowns
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
DFR: 0 Deferred Error APIC interrupts
MCE: 0 Machine check exceptions
MCP: 3 Machine check polls
ERR: 0
MIS: 0
PIN: 0 Posted-interrupt notification event
PIW: 0 Posted-interrupt wakeup event
lspci
02:00.0 USB controller: Renesas Technology Corp. uPD720202 USB 3.0
Host Controller (rev 02) (prog-if 30 [XHCI])
Subsystem: Renesas Technology Corp. uPD720202 USB 3.0 Host Controller
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 11
Region 0: Memory at b5000000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [50] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [90] MSI-X: Enable+ Count=8 Masked-
Vector table: BAR=0 offset=00001000
PBA: BAR=0 offset=00001080
Capabilities: [a0] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s
unlimited, L1 unlimited
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
LnkCap: Port #0, Speed 5GT/s, Width x1, ASPM L0s L1, Exit
Latency L0s <4us, L1 unlimited
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR+,
OBFF Not Supported
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
OBFF Disabled
LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -3.5dB,
EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
Kernel driver in use: xhci_hcd
2017-05-23 12:55 GMT+02:00 Mathias Nyman <[email protected]>:
> On 22.05.2017 21:24, Xavier . wrote:
>>
>> Hello and thanks
>>
>> dmesg.4.12-rc1.with_dyndbg_pendrive_connected_at_boot_1r.txt (1r and
>> 2n are very different on xhci)
>>
>>
>> [ 0.000000] Linux version 4.12.0-041200rc1-generic (kernel@gomeisa)
>> (gcc version 6.3.0 20170510 (Ubuntu 6.3.0-17ubuntu1) ) #201705131731
>> SMP Sat May 13 21:48:41 UTC 2017
>
> ...
>>
>> [ 4.281409] xhci_hcd 0000:02:00.0: xHCI Host Controller
>>
>> [ 4.281431] xhci_hcd 0000:02:00.0: new USB bus registered, assigned
>> bus number 2
>> [ 4.281466] xhci_hcd 0000:02:00.0: xHCI capability registers at
>> f8452000:
>> [ 4.281473] xhci_hcd 0000:02:00.0: CAPLENGTH AND HCIVERSION 0x1000020:
>> [ 4.281477] xhci_hcd 0000:02:00.0: CAPLENGTH: 0x20
>> [ 4.281482] xhci_hcd 0000:02:00.0: HCIVERSION: 0x100
>> [ 4.281489] xhci_hcd 0000:02:00.0: HCSPARAMS 1: 0x4000820
>> [ 4.281493] xhci_hcd 0000:02:00.0: Max device slots: 32
>> [ 4.281498] xhci_hcd 0000:02:00.0: Max interrupters: 8
>> [ 4.281502] xhci_hcd 0000:02:00.0: Max ports: 4
>> [ 4.281509] xhci_hcd 0000:02:00.0: HCSPARAMS 2: 0x24000011
>> [ 4.281513] xhci_hcd 0000:02:00.0: Isoc scheduling threshold: 1
>> [ 4.281518] xhci_hcd 0000:02:00.0: Maximum allowed segments in
>> event ring: 1
>> [ 4.281524] xhci_hcd 0000:02:00.0: HCSPARAMS 3 0x0:
>> [ 4.281529] xhci_hcd 0000:02:00.0: Worst case U1 device exit latency:
>> 0
>> [ 4.281533] xhci_hcd 0000:02:00.0: Worst case U2 device exit latency:
>> 0
>> [ 4.281540] xhci_hcd 0000:02:00.0: HCC PARAMS 0x14051cf:
>> [ 4.281545] xhci_hcd 0000:02:00.0: HC generates 64 bit addresses
>> [ 4.281549] xhci_hcd 0000:02:00.0: HC hasn't Contiguous Frame ID
>> Capability
>> [ 4.281554] xhci_hcd 0000:02:00.0: HC can't generate Stopped -
>> Short Package event
>> [ 4.281558] xhci_hcd 0000:02:00.0: FIXME: more HCCPARAMS debugging
>> [ 4.281565] xhci_hcd 0000:02:00.0: RTSOFF 0x600:
>> [ 4.281570] xhci_hcd 0000:02:00.0: xHCI operational registers at
>> f8452020:
>> [ 4.281576] xhci_hcd 0000:02:00.0: USBCMD 0x0:
>> [ 4.281581] xhci_hcd 0000:02:00.0: HC is being stopped
>> [ 4.281585] xhci_hcd 0000:02:00.0: HC has finished hard reset
>> [ 4.281589] xhci_hcd 0000:02:00.0: Event Interrupts disabled
>> [ 4.281594] xhci_hcd 0000:02:00.0: Host System Error Interrupts
>> disabled
>> [ 4.281598] xhci_hcd 0000:02:00.0: HC has finished light reset
>> [ 4.281605] xhci_hcd 0000:02:00.0: USBSTS 0x1:
>> [ 4.281609] xhci_hcd 0000:02:00.0: Event ring is empty
>> [ 4.281613] xhci_hcd 0000:02:00.0: No Host System Error
>> [ 4.281617] xhci_hcd 0000:02:00.0: HC is halted
>> [ 4.281625] xhci_hcd 0000:02:00.0: f8452420 port status reg = 0x80
>> [ 4.281632] xhci_hcd 0000:02:00.0: f8452424 port power reg = 0x0
>> [ 4.281640] xhci_hcd 0000:02:00.0: f8452428 port link reg = 0x0
>> [ 4.281647] xhci_hcd 0000:02:00.0: f845242c port reserved reg = 0x0
>> [ 4.281654] xhci_hcd 0000:02:00.0: f8452430 port status reg = 0x80
>> [ 4.281661] xhci_hcd 0000:02:00.0: f8452434 port power reg = 0x0
>> [ 4.281668] xhci_hcd 0000:02:00.0: f8452438 port link reg = 0x0
>> [ 4.281676] xhci_hcd 0000:02:00.0: f845243c port reserved reg = 0x0
>> [ 4.281683] xhci_hcd 0000:02:00.0: f8452440 port status reg = 0x80
>> [ 4.281690] xhci_hcd 0000:02:00.0: f8452444 port power reg = 0x0
>> [ 4.281697] xhci_hcd 0000:02:00.0: f8452448 port link reg = 0x0
>> [ 4.281704] xhci_hcd 0000:02:00.0: f845244c port reserved reg = 0x0
>> [ 4.281711] xhci_hcd 0000:02:00.0: f8452450 port status reg = 0x80
>> [ 4.281718] xhci_hcd 0000:02:00.0: f8452454 port power reg = 0x0
>> [ 4.281725] xhci_hcd 0000:02:00.0: f8452458 port link reg = 0x0
>> [ 4.281732] xhci_hcd 0000:02:00.0: f845245c port reserved reg = 0x0
>> [ 4.281738] xhci_hcd 0000:02:00.0: QUIRK: Resetting on resume
>> [ 4.281743] xhci_hcd 0000:02:00.0: // Halt the HC
>> [ 4.281755] xhci_hcd 0000:02:00.0: Resetting HCD
>> [ 4.281762] xhci_hcd 0000:02:00.0: // Reset the HC
>> [ 4.286927] xhci_hcd 0000:02:00.0: Wait for controller to be ready
>> for doorbell rings
>> [ 4.286934] xhci_hcd 0000:02:00.0: Reset complete
>> [ 4.286940] xhci_hcd 0000:02:00.0: Enabling 64-bit DMA addresses.
>> [ 4.286944] xhci_hcd 0000:02:00.0: Calling HCD init
>> [ 4.286949] xhci_hcd 0000:02:00.0: xhci_init
>> [ 4.286953] xhci_hcd 0000:02:00.0: xHCI doesn't need link TRB QUIRK
>> [ 4.286960] xhci_hcd 0000:02:00.0: Supported page size register = 0x1
>> [ 4.286965] xhci_hcd 0000:02:00.0: Supported page size of 4K
>> [ 4.286969] xhci_hcd 0000:02:00.0: HCD page size set to 4K
>> [ 4.286976] xhci_hcd 0000:02:00.0: // xHC can handle at most 32 device
>> slots.
>> [ 4.286982] xhci_hcd 0000:02:00.0: // Setting Max device slots reg =
>> 0x20.
>> [ 4.287128] ata2: port disabled--ignoring
>> [ 4.287171] xhci_hcd 0000:02:00.0: // Device context base array
>> address = 0x35617000 (DMA), f5617000 (virt)
>> [ 4.287194] xhci_hcd 0000:02:00.0: Allocated command ring at f5615840
>> [ 4.287198] xhci_hcd 0000:02:00.0: First segment DMA is 0x35620000
>> [ 4.287207] xhci_hcd 0000:02:00.0: // Setting command ring address
>> to 0x0000000035620001
>> [ 4.287216] xhci_hcd 0000:02:00.0: // xHC command ring deq ptr low
>> bits + flags = @00000000
>> [ 4.287221] xhci_hcd 0000:02:00.0: // xHC command ring deq ptr high
>> bits = @00000000
>> [ 4.287239] xhci_hcd 0000:02:00.0: // Doorbell array is located at
>> offset 0x800 from cap regs base addr
>> [ 4.287244] xhci_hcd 0000:02:00.0: // xHCI capability registers at
>> f8452000:
>> [ 4.287251] xhci_hcd 0000:02:00.0: // @f8452000 = 0x1000020
>> (CAPLENGTH AND HCIVERSION)
>> [ 4.287255] xhci_hcd 0000:02:00.0: // CAPLENGTH: 0x20
>> [ 4.287260] xhci_hcd 0000:02:00.0: // HCIVERSION: 0x100
>> [ 4.287265] xhci_hcd 0000:02:00.0: // xHCI operational registers at
>> f8452020:
>> [ 4.287271] xhci_hcd 0000:02:00.0: // @f8452018 = 0x600 RTSOFF
>> [ 4.287276] xhci_hcd 0000:02:00.0: // xHCI runtime registers at
>> f8452600:
>> [ 4.287282] xhci_hcd 0000:02:00.0: // @f8452014 = 0x800 DBOFF
>> [ 4.287286] xhci_hcd 0000:02:00.0: // Doorbell array at f8452800:
>> [ 4.287291] xhci_hcd 0000:02:00.0: xHCI runtime registers at f8452600:
>> [ 4.287297] xhci_hcd 0000:02:00.0: f8452600: Microframe index = 0x0
>> [ 4.287313] xhci_hcd 0000:02:00.0: // Allocating event ring
>> [ 4.287336] xhci_hcd 0000:02:00.0: TRB math tests passed.
>> [ 4.287343] xhci_hcd 0000:02:00.0: // Allocated event ring segment
>> table at 0x35623000
>> [ 4.287349] xhci_hcd 0000:02:00.0: Set ERST to 0; private num segs
>> = 1, virt addr = f5623000, dma addr = 0x35623000
>> [ 4.287355] xhci_hcd 0000:02:00.0: // Write ERST size = 1 to ir_set
>> 0 (some bits preserved)
>> [ 4.287360] xhci_hcd 0000:02:00.0: // Set ERST entries to point to
>> event ring.
>> [ 4.287365] xhci_hcd 0000:02:00.0: // Set ERST base address for
>> ir_set 0 = 0x35623000
>> [ 4.287377] xhci_hcd 0000:02:00.0: // Write event ring dequeue
>> pointer, preserving EHB bit
>> [ 4.287381] xhci_hcd 0000:02:00.0: Wrote ERST address to ir_set 0.
>> [ 4.287389] xhci_hcd 0000:02:00.0: Allocating 4 scratchpad buffers
>> [ 4.287452] xhci_hcd 0000:02:00.0: Ext Cap f8452510, port offset =
>> 1, count = 2, revision = 0x3
>> [ 4.287466] xhci_hcd 0000:02:00.0: Ext Cap f8452524, port offset =
>> 3, count = 2, revision = 0x2
>> [ 4.287470] xhci_hcd 0000:02:00.0: xHCI 1.0: support USB2 software lpm
>> [ 4.287475] xhci_hcd 0000:02:00.0: Found 2 USB 2.0 ports and 2 USB 3.0
>> ports.
>> [ 4.287481] xhci_hcd 0000:02:00.0: USB 2.0 port at index 2, addr =
>> f8452440
>> [ 4.287486] xhci_hcd 0000:02:00.0: USB 2.0 port at index 3, addr =
>> f8452450
>> [ 4.287491] xhci_hcd 0000:02:00.0: USB 3.0 port at index 0, addr =
>> f8452420
>> [ 4.287496] xhci_hcd 0000:02:00.0: USB 3.0 port at index 1, addr =
>> f8452430
>> [ 4.287502] xhci_hcd 0000:02:00.0: Finished xhci_init
>> [ 4.287508] xhci_hcd 0000:02:00.0: Called HCD init
>> [ 4.287514] xhci_hcd 0000:02:00.0: hcc params 0x014051cf hci
>> version 0x100 quirks 0x00000090
>> [ 4.287528] xhci_hcd 0000:02:00.0: xhci_run
>> [ 4.287743] xhci_hcd 0000:02:00.0: // xHC command ring deq ptr low
>> bits + flags = @00000000
>> [ 4.287748] xhci_hcd 0000:02:00.0: // xHC command ring deq ptr high
>> bits = @00000000
>> [ 4.287752] xhci_hcd 0000:02:00.0: ERST memory map follows:
>> [ 4.287759] xhci_hcd 0000:02:00.0: @0000000035623000 35622000
>> 00000000 00000100 00000000
>> [ 4.287767] xhci_hcd 0000:02:00.0: ERST deq = 64'h35622000
>> [ 4.287772] xhci_hcd 0000:02:00.0: // Set the interrupt modulation
>> register
>> [ 4.287780] xhci_hcd 0000:02:00.0: // Enable interrupts, cmd = 0x4.
>> [ 4.287787] xhci_hcd 0000:02:00.0: // Enabling event ring
>> interrupter f8452620 by writing 0x2 to irq_pending
>> [ 4.287794] xhci_hcd 0000:02:00.0: f8452620: ir_set[0]
>> [ 4.287799] xhci_hcd 0000:02:00.0: f8452620: ir_set.pending = 0x2
>> [ 4.287806] xhci_hcd 0000:02:00.0: f8452624: ir_set.control = 0xa0
>> [ 4.287812] xhci_hcd 0000:02:00.0: f8452628: ir_set.erst_size = 0x1
>> [ 4.287822] xhci_hcd 0000:02:00.0: f8452630: ir_set.erst_base =
>> @35623000
>> [ 4.287831] xhci_hcd 0000:02:00.0: f8452638: ir_set.erst_dequeue
>> = @35622000
>> [ 4.287835] xhci_hcd 0000:02:00.0: Finished xhci_run for USB2 roothub
>> [ 4.287996] usb usb2: New USB device found, idVendor=1d6b,
>> idProduct=0002
>> [ 4.288002] usb usb2: New USB device strings: Mfr=3, Product=2,
>> SerialNumber=1
>> [ 4.288007] usb usb2: Product: xHCI Host Controller
>> [ 4.288011] usb usb2: Manufacturer: Linux 4.12.0-041200rc1-generic
>> xhci-hcd
>> [ 4.288015] usb usb2: SerialNumber: 0000:02:00.0
>> [ 4.288369] xHCI xhci_add_endpoint called for root hub
>> [ 4.288374] xHCI xhci_check_bandwidth called for root hub
>> [ 4.288383] xhci_hcd 0000:02:00.0: Endpoint 0x81 ep reset callback
>> called
>> [ 4.288493] hub 2-0:1.0: USB hub found
>> [ 4.288526] hub 2-0:1.0: 2 ports detected
>> [ 4.288703] xhci_hcd 0000:02:00.0: set port power, actual port 0
>> status = 0x2a0
>> [ 4.288731] xhci_hcd 0000:02:00.0: set port power, actual port 1
>> status = 0x2a0
>> [ 4.288899] xhci_hcd 0000:02:00.0: xHCI Host Controller
>> [ 4.288915] xhci_hcd 0000:02:00.0: new USB bus registered, assigned
>> bus number 3
>> [ 4.288931] xhci_hcd 0000:02:00.0: // Turn on HC, cmd = 0x5.
>> [ 4.290521] xhci_hcd 0000:02:00.0: Finished xhci_run for USB3 roothub
>> [ 4.290573] usb usb3: We don't know the algorithms for LPM for this
>> host, disabling LPM.
>> [ 4.290759] usb usb3: New USB device found, idVendor=1d6b,
>> idProduct=0003
>> [ 4.290765] usb usb3: New USB device strings: Mfr=3, Product=2,
>> SerialNumber=1
>> [ 4.290769] usb usb3: Product: xHCI Host Controller
>> [ 4.290774] usb usb3: Manufacturer: Linux 4.12.0-041200rc1-generic
>> xhci-hcd
>> [ 4.290778] usb usb3: SerialNumber: 0000:02:00.0
>> [ 4.291049] xHCI xhci_add_endpoint called for root hub
>> [ 4.291053] xHCI xhci_check_bandwidth called for root hub
>> [ 4.291060] xhci_hcd 0000:02:00.0: Endpoint 0x81 ep reset callback
>> called
>> [ 4.291176] hub 3-0:1.0: USB hub found
>> [ 4.291204] hub 3-0:1.0: 2 ports detected
>> [ 4.291401] xhci_hcd 0000:02:00.0: set port power, actual port 0
>> status = 0x2a0
>> [ 4.291430] xhci_hcd 0000:02:00.0: set port power, actual port 1
>> status = 0x2a0
>
>
> ...
>
>> [ 4.390793] xhci_hcd 0000:02:00.0: get port status, actual port 0
>> status = 0x2a0
>> [ 4.390800] xhci_hcd 0000:02:00.0: Get port status returned 0x100
>> [ 4.390838] xhci_hcd 0000:02:00.0: get port status, actual port 1
>> status = 0x202e1
>> [ 4.390843] xhci_hcd 0000:02:00.0: Get port status returned 0x10101
>> [ 4.390873] xhci_hcd 0000:02:00.0: clear port connect change,
>> actual port 1 status = 0x2e1
>> [ 4.394856] xhci_hcd 0000:02:00.0: get port status, actual port 0
>> status = 0x2a0
>> [ 4.394865] xhci_hcd 0000:02:00.0: Get port status returned 0x2a0
>> [ 4.394932] xhci_hcd 0000:02:00.0: get port status, actual port 1
>> status = 0x2a0
>> [ 4.394937] xhci_hcd 0000:02:00.0: Get port status returned 0x2a0
>> [ 4.395004] xhci_hcd 0000:02:00.0: set port remote wake mask,
>> actual port 0 status = 0xe0002a0
>> [ 4.395037] xhci_hcd 0000:02:00.0: set port remote wake mask,
>> actual port 1 status = 0xe0002a0
>> [ 4.395090] xhci_hcd 0000:02:00.0: xhci_hub_status_data: stopping
>> port polling.
>
>
>> [ 4.494950] xhci_hcd 0000:02:00.0: get port status, actual port 1
>> status = 0x2e1
>> [ 4.494959] xhci_hcd 0000:02:00.0: Get port status returned 0x101
>> [ 4.495012] xhci_hcd 0000:02:00.0: // Ding dong!
>
>
> Queued the first enable slot command and wait for it to complete
> Everything looks good so far.
>
>> [ 9.698731] xhci_hcd 0000:02:00.0: Command timeout
>> [ 9.698736] xhci_hcd 0000:02:00.0: Abort command ring
>> [ 11.714714] xhci_hcd 0000:02:00.0: No stop event for abort, ring start
>> fail?
>> [ 11.714732] xhci_hcd 0000:02:00.0: Error while assigning device slot ID
>
>
> 5 seconds later driver times out on the command.
> To me this looks like we never get the command completiong interrupt
>
> Actually this looks like interupts are not working for xhci at all.
>
> Are there any interrupts for xhci? does /proc/interrupts show
> 0 interrupts for xhci for 4.12-rc1
>
>
>> [ 11.714923] xhci_hcd 0000:02:00.0: Max number of devices this xHCI
>> host supports is 32.
>> [ 11.715132] usb usb2-port2: couldn't allocate usb_device
>> [ 11.715290] xhci_hcd 0000:02:00.0: disable port, actual port 1
>> status = 0x2e1
>> [ 11.715381] xhci_hcd 0000:02:00.0: xhci_hub_status_data: stopping
>> port polling.
>>
>> **********************************************************************************************************************
>>
>> dmesg.4.12-rc1.with_dyndbg_pendrive_connected_at_boot_2n
>>
>> [ 0.000000] Linux version 4.12.0-041200rc1-generic (kernel@gomeisa)
>> (gcc version 6.3.0 20170510 (Ubuntu 6.3.0-17ubuntu1) ) #201705131731
>> SMP Sat May 13 21:48:41 UTC 2017
>
>
>> [ 4.097413] xhci_hcd 0000:02:00.0: xHCI Host Controller
>> [ 4.097433] xhci_hcd 0000:02:00.0: new USB bus registered, assigned
>> bus number 2
>> [ 4.178095] xhci_hcd 0000:02:00.0: xHCI capability registers at
>> f8452000:
>> [ 4.188170] xhci_hcd 0000:02:00.0: CAPLENGTH AND HCIVERSION 0xffffffff:
>> [ 4.188175] xhci_hcd 0000:02:00.0: CAPLENGTH: 0xff
>> [ 4.188180] xhci_hcd 0000:02:00.0: HCIVERSION: 0xffff
>> [ 4.198256] xhci_hcd 0000:02:00.0: HCSPARAMS 1: 0xffffffff
>> [ 4.198261] xhci_hcd 0000:02:00.0: Max device slots: 255
>> [ 4.198265] xhci_hcd 0000:02:00.0: Max interrupters: 2047
>> [ 4.198270] xhci_hcd 0000:02:00.0: Max ports: 127
>> [ 4.208346] xhci_hcd 0000:02:00.0: HCSPARAMS 2: 0xffffffff
>
>
> Ok this second case we fail completely to read any xhci register, they all
> return 0xffffffff
> This is what it would look it xhci controller disappeared completely from
> PCI bus
>
> So first case looks like messed up PCI interrupts (MSI/MSI-X) and second one
> looks
> like reading registers fail completely for this PCI device.
>
> -Mathias
>
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