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    SubjectRe: [PATCH v10 0/6] Re-introduce TX FIFO resize for larger EP bursting
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    Hi Ferry,

    On 7/25/2021 10:57 PM, Felipe Balbi wrote:
    >
    > Hi,
    >
    > Ferry Toth <fntoth@gmail.com> writes:
    >>>>> Ferry Toth <fntoth@gmail.com> writes:
    >>>>>>>>>> Hardware name: Intel Corporation Merrifield/BODEGA BAY, BIOS 542
    >>>>>>>>>> 2015.01.21:18.19.48
    >>>>>>>>>> RIP: 0010:0x500000000
    >>>>>>>>>> Code: Unable to access opcode bytes at RIP 0x4ffffffd6.
    >>>>>>>>>> RSP: 0018:ffffa4d00045fc28 EFLAGS: 00010046
    >>>>>>>>>> RAX: 0000000500000000 RBX: ffff8cd546aed200 RCX: 0000000000000000
    >>>>>>>>>> RDX: 0000000000000000 RSI: ffff8cd547bfcae0 RDI: ffff8cd546aed200
    >>>>>>>>>> RBP: ffff8cd547bfcae0 R08: 0000000000000000 R09: 0000000000000001
    >>>>>>>>>> R10: ffff8cd541fd28c0 R11: 0000000000000000 R12: ffff8cd547342828
    >>>>>>>>>> R13: ffff8cd546aed248 R14: 0000000000000000 R15: ffff8cd548b1d000
    >>>>>>>>>> FS: 0000000000000000(0000) GS:ffff8cd57e200000(0000) knlGS:0000000000000000
    >>>>>>>>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    >>>>>>>>>> CR2: 0000000500000000 CR3: 000000000311e000 CR4: 00000000001006f0
    >>>>>>>>>> Call Trace:
    >>>>>>>>>> ? dwc3_remove_requests.constprop.0+0x14d/0x170
    >>>>>>>>>> ? __dwc3_gadget_ep_disable+0x7a/0x160
    >>>>>>>>>> ? dwc3_gadget_ep_disable+0x3d/0xd0
    >>>>>>>>>> ? usb_ep_disable+0x1c/0x
    >>>>>>>>>> ? u_audio_stop_capture+0x79/0x120 [u_audio]
    >>>>>>>>>> ? afunc_set_alt+0x73/0x80 [usb_f_uac2]
    >>> So this is triggered by a SetInterface request...
    >>>
    >>>>>>>>>> ? composite_setup+0x224/0x1b90 [libcomposite]
    >>>>>>>>>> ? __dwc3_gadget_kick_transfer+0x160/0x400
    >>>>>>>>>> ? dwc3_gadget_ep_queue+0xf3/0x1a0
    >>>>>>>>>> ? configfs_composite_setup+0x6b/0x90 [libcomposite]
    >>>>>>>>>> ? configfs_composite_setup+0x6b/0x90 [libcomposite]
    >>>>>>>>>> ? dwc3_ep0_interrupt+0x459/0xa40
    >>>>>>>>>> ? dwc3_thread_interrupt+0x8ee/0xf40
    >>>>>>>>>> ? __schedule+0x235/0x6c0
    >>>>>>>>>> ? disable_irq_nosync+0x10/0x10
    >>>>>>>>>> ? irq_thread_fn+0x1b/0x60
    >>>>>>>>>> ? irq_thread+0xc0/0x160
    >>>>>>>>>> ? irq_thread_check_affinity+0x70/0x70
    >>>>>>>>>> ? irq_forced_thread_fn+0x70/0x70
    >>>>>>>>>> ? kthread+0x122/0x140
    >>>>>>>>>> ? set_kthread_struct+0x40/0x40
    >>>>>>>>>> ? ret_from_fork+0x22/0x30
    >>>>>>>>> Do you mind enabling dwc3 traces and collecting them? Trying to figure
    >>>>>>>>> out how we got here.
    >>>>>>>>>
    >>>>>>>> I'll try if I can get the same error by booting with USB in host mode
    >>>>>>>> and then switch to device mode. If so I can enable traces and collect as
    >>>>>>>> you explained me before.
    >>>>>>>>
    >>>>>>>> I'll try before monday, as then I fly for a holiday and will not be
    >>>>>>>> available before rc5.
    >>>>>>> you can enable all of those with kernel cmdline :-)
    >>>>>>>
    >>>>>>> https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
    >>>>>>>
    >>>>>>> you need ftrace_dump_on_oops=1 and also need the correct options on
    >>>>>>> trace_buf_size and trace_event.
    >>>>>>>
    >>>>>> On Edison-Arduino I have a switch to go to device mode, after which
    >>>>>> udev triggers a script configure gadgets through configfs.
    >>>>>>
    >>>>>> I tried to log following these instructions:
    >>>>>>
    >>>>>> https://www.kernel.org/doc/html/latest/driver-api/usb/dwc3.html#reporting-bugs <https://www.kernel.org/doc/html/latest/driver-api/usb/dwc3.html#reporting-bugs>
    >>>>>>
    >>>>>> Unfortunately the kernel crashes so badly I can not get to the ` cp
    >>>>>> /t/trace /root/trace.txt` line (after a while the watchdog kicks).
    >>>>>>
    >>>>>> What to do next?
    >>>>> Pass ftrace_dump_on_oops to kernel cmdline.
    >>>>>
    >>>> No sure if I did this right, on oops everything is pushed to console
    >>>> (115k2 serial), I hope nothing essential is lost.
    >>>>
    >>>> I copied the screen buffer to file see attached.
    >>> Thank you, I bet it took quite a some time :-) Anyway, looking at
    >>> the logs around Set Interface requests, we can track every endpoint
    >>> that's disabled. I'll take a guess and assume we're failing at the last
    >>> Set Interface, that means we should have something odd with ep6in, but
    >>> everything looks fine in the trace output:
    >>>
    >>> [ 75.823107] irq/14-d-596 0d... 42789194us : dwc3_gadget_ep_enable: ep6in: mps 192/346 streams 16 burst 0 ring 0/0 flags E:swbp:<
    >>> [ 75.835472] irq/14-d-596 0d... 42789198us : dwc3_alloc_request: ep6in: req 0000000002c71409 length 0/0 zsI ==> 0
    >>> [ 75.846416] irq/14-d-596 0d... 42789202us : dwc3_ep_queue: ep6in: req 0000000002c71409 length 0/192 zsI ==> -115
    >>> [ 75.857360] irq/14-d-596 0d... 42789204us : dwc3_alloc_request: ep6in: req 00000000a324f5d0 length 0/0 zsI ==> 0
    >>> [ 75.868301] irq/14-d-596 0d... 42789206us : dwc3_ep_queue: ep6in: req 00000000a324f5d0 length 0/192 zsI ==> -115
    >>> [ 75.879244] irq/14-d-596 0d... 42789209us : dwc3_event: event (000020c2): ep0in: Transfer Not Ready [0] (Not Active) [Status Phase]
    >>> [ 75.891880] irq/14-d-596 0d... 42789211us : dwc3_prepare_trb: ep0in: trb 000000004c0ae319 (E0:D0) buf 000000001bded000 size 0 ctrl 00000c33 (HLcs:SC:status2)
    >>> [ 75.989131] irq/14-d-596 0d... 42789224us : dwc3_gadget_ep_cmd: ep0in: cmd 'Start Transfer' [406] params 00000000 1bded000 00000000 --> status: Successful
    >>> [ 76.096261] irq/14-d-596 0d... 42789272us : dwc3_event: event (0000c042): ep0in: Transfer Complete (sIL) [Status Phase]
    >>> [ 76.107834] irq/14-d-596 0d... 42789275us : dwc3_complete_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf 000000001bded000 size 0 ctrl 00000c32 (hLcs:SC:status2)
    >>> [ 76.122944] irq/14-d-596 0d... 42789277us : dwc3_gadget_giveback: ep0out: req 00000000cb1bd3cd length 0/0 zsI ==> 0
    >>> [ 76.134160] irq/14-d-596 0d... 42789280us : dwc3_prepare_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf 000000001bded000 size 8 ctrl 00000c23 (HLcs:SC:setup)
    >>> [ 76.231322] irq/14-d-596 0d... 42789292us : dwc3_gadget_ep_cmd: ep0out: cmd 'Start Transfer' [406] params 00000000 1bded000 00000000 --> status: Successful
    >>> [ 76.297418] kworker/-23 0d... 42789670us : dwc3_ep_queue: ep3in: req 0000000029586135 length 0/96 ZsI ==> -115
    >>> [ 76.308278] kworker/-23 0d... 42789695us : dwc3_prepare_trb: ep3in: trb 00000000b81213d6 (E1:D0) buf 0000000003b7a800 size 96 ctrl 00000811 (Hlcs:sC:normal)
    >>> [ 76.395294] kworker/-23 0d... 42789707us : dwc3_gadget_ep_cmd: ep3in: cmd 'Update Transfer' [60007] params 00000000 00000000 00000000 --> status: Successful
    >>> [ 76.471900] irq/14-d-596 0d... 42789842us : dwc3_event: event (0000c040): ep0out: Transfer Complete (sIL) [Setup Phase]
    >>> [ 76.489308] irq/14-d-596 0d... 42789845us : dwc3_ctrl_req: Set Interface(Intf = 5, Alt.Setting = 0)
    >>> [ 76.505650] irq/14-d-596 0d... 42789851us : dwc3_ep_dequeue: ep6in: req 0000000002c71409 length 0/192 zsI ==> -115
    >>> [ 76.523315] irq/14-d-596 0d... 42789854us : dwc3_gadget_giveback: ep6in: req 0000000002c71409 length 0/192 zsI ==> -104
    >>> [ 76.541427] irq/14-d-596 0d... 42789857us : dwc3_free_request: ep6in: req 0000000002c71409 length 0/192 zsI ==> -104
    >>> [ 76.559267] irq/14-d-596 0d... 42789859us : dwc3_ep_dequeue: ep6in: req 00000000a324f5d0 length 0/192 zsI ==> -115
    >>> [ 76.576937] irq/14-d-596 0d... 42789861us : dwc3_gadget_giveback: ep6in: req 00000000a324f5d0 length 0/192 zsI ==> -104
    >>> [ 76.595046] irq/14-d-596 0d... 42789862us : dwc3_free_request: ep6in: req 00000000a324f5d0 length 0/192 zsI ==> -104
    >>> [ 76.612892] irq/14-d-596 0d... 42789865us : dwc3_gadget_ep_disable: ep6in: mps 192/346 streams 16 burst 0 ring 0/0 flags E:swbp:<
    >>> [ 76.665535] irq/14-d-596 0d... 42789873us : dwc3_event: event (000020c2): ep0in: Transfer Not Ready [0] (Not Active) [Status Phase]
    >>> [ 76.684716] irq/14-d-596 0d... 42789875us : dwc3_prepare_trb: ep0in: trb 000000004c0ae319 (E0:D0) buf 000000001bded000 size 0 ctrl 00000c33 (HLcs:SC:status2)
    >>> [ 76.819195] irq/14-d-596 0d... 42789886us : dwc3_gadget_ep_cmd: ep0in: cmd 'Start Transfer' [406] params 00000000 1bded000 00000000 --> status: Successful
    >>> [ 76.926324] irq/14-d-596 0d... 42789930us : dwc3_event: event (0000c042): ep0in: Transfer Complete (sIL) [Status Phase]
    >>> [ 76.937892] irq/14-d-596 0d... 42789933us : dwc3_complete_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf 000000001bded000 size 0 ctrl 00000c32 (hLcs:SC:status2)
    >>> [ 76.953003] irq/14-d-596 0d... 42789935us : dwc3_gadget_giveback: ep0out: req 00000000cb1bd3cd length 0/0 zsI ==> 0
    >>> [ 76.964217] irq/14-d-596 0d... 42789938us : dwc3_prepare_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf 000000001bded000 size 8 ctrl 00000c23 (HLcs:SC:setup)
    >>> [ 77.061379] irq/14-d-596 0d... 42789950us : dwc3_gadget_ep_cmd: ep0out: cmd 'Start Transfer' [406] params 00000000 1bded000 00000000 --> status: Successful
    >>> [ 77.168595] irq/14-d-596 0d... 42790509us : dwc3_event: event (0000c040): ep0out: Transfer Complete (sIL) [Setup Phase]
    >>> [ 77.180159] irq/14-d-596 0d... 42790512us : dwc3_ctrl_req: Get String Descriptor(Index = 18, Length = 255)
    >>> [ 77.190578] irq/14-d-596 0d... 42790537us : dwc3_prepare_trb: ep0in: trb 000000004c0ae319 (E0:D0) buf 0000000003b68000 size 36 ctrl 00000c53 (HLcs:SC:data)
    >>> [ 77.287648] irq/14-d-596 0d... 42790550us : dwc3_gadget_ep_cmd: ep0in: cmd 'Start Transfer' [406] params 00000000 1bded000 00000000 --> status: Successful
    >>> [ 77.333107] irq/14-d-596 0d... 42790557us : dwc3_event: event (000010c2): ep0in: Transfer Not Ready [0] (Not Active) [Data Phase]
    >>> [ 77.407223] irq/14-d-596 0d... 42790575us : dwc3_event: event (000090c2): ep0in: Transfer Not Ready [0] (Active) [Data Phase]
    >>> [ 77.480985] irq/14-d-596 0d... 42790588us : dwc3_event: event (0000c042): ep0in: Transfer Complete (sIL) [Data Phase]
    >>> [ 77.492376] irq/14-d-596 0d... 42790590us : dwc3_complete_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf 0000000003b68000 size 0 ctrl 00000c52 (hLcs:SC:data)
    >>> [ 77.507221] irq/14-d-596 0d... 42790595us : dwc3_gadget_giveback: ep0out: req 00000000cb1bd3cd length 36/36 ZsI ==> 0
    >>> [ 77.518609] irq/14-d-596 0d... 42790597us : dwc3_event: event (000020c0): ep0out: Transfer Not Ready [0] (Not Active) [Status Phase]
    >>> [ 77.531332] irq/14-d-596 0d... 42790598us : dwc3_prepare_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf 000000001bded000 size 0 ctrl 00000c43 (HLcs:SC:status3)
    >>> [ 77.628669] irq/14-d-596 0d... 42790609us : dwc3_gadget_ep_cmd: ep0out: cmd 'Start Transfer' [406] params 00000000 1bded000 00000000 --> status: Successful
    >>>
    >>> Do you mind adding a few prints in dwc3_remove_requests to tell us which
    >>> endpoint is being processed? Then we'll know for sure which one caused
    >>> the crash.
    >>>
    >> I wouldn't mind but am leaving on a holiday, won't have time until 6 aug.
    >
    > not a problem, we'll still be here when you're back :-)
    >
    >> But as I am using configfs (excerpt follows) and just disabling the
    >> last 2 line resolves the issue, I'm guessing uac2 is the issue. Or
    >> exceeding the available resources.
    >>
    >> # Create directory structure
    >> mkdir "${GADGET_BASE_DIR}"
    >> cd "${GADGET_BASE_DIR}"
    >> mkdir -p configs/c.1/strings/0x409
    >> mkdir -p strings/0x409
    >>
    >> # Serial device
    >> mkdir functions/gser.usb0
    >> ln -s functions/gser.usb0 configs/c.1/
    >> ###
    >>
    >> # Ethernet device
    >> mkdir functions/eem.usb0
    >> echo "${DEV_ETH_ADDR}" > functions/eem.usb0/dev_addr
    >> echo "${HOST_ETH_ADDR}" > functions/eem.usb0/host_addr
    >> ln -s functions/eem.usb0 configs/c.1/
    >>
    >> # Mass Storage device
    >> mkdir functions/mass_storage.usb0
    >> echo 1 > functions/mass_storage.usb0/stall
    >> echo 0 > functions/mass_storage.usb0/lun.0/cdrom
    >> echo 0 > functions/mass_storage.usb0/lun.0/ro
    >> echo 0 > functions/mass_storage.usb0/lun.0/nofua
    >> echo "${USBDISK}" > functions/mass_storage.usb0/lun.0/file
    >> ln -s functions/mass_storage.usb0 configs/c.1/
    >>
    >> # UAC2 device
    >> mkdir functions/uac2.usb0
    >> ln -s functions/uac2.usb0 configs/c.1
    >
    > Right, either there's an actual bug in uac2, or we're running out of
    > FIFO space.
    >

    Are you enabling the TXFIFO flag here again? If we suspect that we're
    running out of FIFO space, then:
    - First, making sure we're explicitly enabling the TXFIFO resize flag.
    - Second, we should see the same warning we saw previously:
    dwc3 dwc3.0.auto: Fifosize(2154) > RAM size(2022) ep5in
    depth:115540359


    Thanks
    Wesley Cheng

    --
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
    a Linux Foundation Collaborative Project

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