linux-kernel - Re: [PATCH v10 0/6] Re-introduce TX FIFO resize for larger EP bursting

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Date:   Fri, 23 Jul 2021 14:23:40 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Ferry Toth <fntoth@...il.com>,
        Wesley Cheng <wcheng@...eaurora.org>,
        gregkh@...uxfoundation.org, robh+dt@...nel.org, agross@...nel.org,
        bjorn.andersson@...aro.org, frowand.list@...il.com
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        jackp@...eaurora.org, heikki.krogerus@...ux.intel.com,
        andy.shevchenko@...il.com
Subject: Re: [PATCH v10 0/6] Re-introduce TX FIFO resize for larger EP bursting

Ferry Toth <fntoth@...il.com> writes:

> Hi
>
> Op 23-07-2021 om 08:59 schreef Felipe Balbi:
>> Hi,
>>
>> Ferry Toth <fntoth@...il.com> writes:
>>>>> kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
>>>>> kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
>>>>> kernel: dwc3 dwc3.0.auto: request 00000000fbc71244 was not queued to ep5in
>>>>> kernel: dwc3 dwc3.0.auto: request 00000000ad1b8c18 was not queued to ep5in
>>>>> kernel: dwc3 dwc3.0.auto: Fifosize(2154) > RAM size(2022) ep5in
>>>>> depth:115540359
>>>>> kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
>>>>> kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
>>>>> kernel: dwc3 dwc3.0.auto: request 000000003c32dcc5 was not queued to ep5in
>>>>> kernel: dwc3 dwc3.0.auto: request 00000000b2512aa9 was not queued to ep5in
>>>>>
>>>>> Removing uac2 from the config makes the call trace go away, but the R/W
>>>>> speed does not change.
>>> I am testing with 5.14.0-rc2 and now related error appears (not in rc1).
>>> Disabling uac2 solves it still. Any idea what it could be?
>>>
>>> BUG: unable to handle page fault for address: 0000000500000000
>>> #PF: supervisor instruction fetch in kernel mode
>>> #PF: error_code(0x0010) - not-present page
>>> PGD 0 P4D 0
>>> Oops: 0010 [#1] SMP PTI
>>> CPU: 0 PID: 494 Comm: irq/14-dwc3 Not tainted
>>> 5.14.0-rc2-edison-acpi-standard #1
>> (cool that you're running on ACPI heh)
> Thanks to Andy this is Edison-Arduino board with ACPI.
>>> 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]
>>>    ? 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.

-- 
balbi

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