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Mon, 23 Aug 2021 16:59:55 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=ivitera.com; s=mail; t=1629730795; bh=BziUjxDkDFcfNZ+akOzEWhlI1jmK6+nQ+Vl9/oVRiao=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=jXcAdZ0Wb4DKT76sw9FhBD8f5rBAWDV2oAq4LiVqDZnvhgvPEkE35rbIGtT5n9B4I Ye8OQ2+5yx44PHJ66qXH1rNV20BndDzg9/ZS7WF86OJOXEB7piLl0qw9yYAcbIe8Gy HoKdSZhWh9OlXKYsuPayx36Fgy42QGt8qStjEKI4= Received: from cable.insite.cz ([84.242.75.189]) by localhost (server.insite.cz [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XZpbF2sHWuzM; Mon, 23 Aug 2021 16:59:48 +0200 (CEST) Received: from [192.168.105.22] (ip28.insite.cz [81.0.237.28]) (Authenticated sender: pavel) by cable.insite.cz (Postfix) with ESMTPSA id 4DF7AA1A3D400; Mon, 23 Aug 2021 16:59:48 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=ivitera.com; s=mail; t=1629730788; bh=BziUjxDkDFcfNZ+akOzEWhlI1jmK6+nQ+Vl9/oVRiao=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=aRe9SFtsih7Xg+2MMche7OLGvfZMvwPusVmuir8jIri69bTMH5DaaYNwhX8ZQjpQL ST2SUTfgSh+2oz0/r+feM3qAKMv/I16JOQB9xNlszqY2PsQnFQ7+sT43az+dC/UK0C /W9TNrUqK2FSFNDw+OgBHmGangeQ5uDaob4GOTwc= Subject: Re: [PATCH v10 0/6] Re-introduce TX FIFO resize for larger EP bursting To: Ferry Toth , Felipe Balbi Cc: Wesley Cheng , gregkh@linuxfoundation.org, robh+dt@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org, frowand.list@gmail.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, jackp@codeaurora.org, heikki.krogerus@linux.intel.com, andy.shevchenko@gmail.com, Ruslan Bilovol References: <1623923899-16759-1-git-send-email-wcheng@codeaurora.org> <2e01c435-9ecc-4e3b-f55c-612a86667020@codeaurora.org> <2ae9fa6a-3bb1-3742-0dd3-59678bdd8643@gmail.com> <87v951ldlt.fsf@kernel.org> <87pmv9l1dv.fsf@kernel.org> <9dc6cd83-17b9-7075-0934-6b9d41b6875d@gmail.com> <87a6mbudvc.fsf@kernel.org> <6e8bb4ad-fe68-ad36-7416-2b8e10b6ae96@gmail.com> <877dhev68a.fsf@kernel.org> <874kchvcq0.fsf@kernel.org> <8735raj766.fsf@kernel.org> <1fb52c92-9319-c035-722f-695ab34723dd@gmail.com> From: Pavel Hofman Message-ID: <702c72cd-40e4-e641-797a-764e7e611afb@ivitera.com> Date: Mon, 23 Aug 2021 16:59:47 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <1fb52c92-9319-c035-722f-695ab34723dd@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dne 22. 08. 21 v 21:43 Ferry Toth napsal(a): > Op 19-08-2021 om 23:04 schreef Pavel Hofman: >> >> Dne 19. 08. 21 v 22:10 Ferry Toth napsal(a): >>> Hi >>> >>> Op 19-08-2021 om 09:51 schreef Pavel Hofman: >>>> Hi, >>>> >>>> Dne 18. 08. 21 v 21:07 Ferry Toth napsal(a): >>>>> Hi, >>>>> >>>>> Op 18-08-2021 om 00:00 schreef Ferry Toth: >>>>>> Hi, >>>>>> >>>>>> Op 16-08-2021 om 07:18 schreef Felipe Balbi: >>>>>>> Hi, >>>>>>> >>>>>>> Ferry Toth writes: >>>>>>>>> Ferry Toth writes: >>>>>>>>>>>>> Ferry Toth 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 >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> 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 :-) >>>>>>>> Well, let's go then :-) >>>>>>>> >>>>>>>> To get back in the mood I have retested 5.13.0, 5.14.0-rc1, >>>>>>>> 5.14.0-rc2 >>>>>>>> and 5.14.0-rc5. >>>>>>>> >>>>>>>> I find that 5.13.0 works fine, and the issue starts from >>>>>>>> 5.14.0-rc1. >>>>>>> That's great finding. We have a bisection point. There are a >>>>>>> total of >>>>>>> 13764 commits between v5.13 and v5.14-rc1 >>>>>>> >>>>>>>     $ git rev-list  --count v5.13..v5.14-rc1 >>>>>>>     13764 >>>>>>> >>>>>>> git bisect should find the offending commit in at most 14 tries. >>>>>>> That's >>>>>>> not too bad. >>>>>> I correctly guesstimated that the problem got introduced by the >>>>>> usb merge 79160a60 >>>>>> >>>>>> "Merge tag 'usb-5.14-rc1' of >>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb" >>>>>> >>>>>> 116 commits(7 bisects). >>>>>> >>>>>> 24f779dac8f3efb9629adc0e486914d93dc45517 is the first bad commit >>>>>> >>>>>> "usb: gadget: f_uac2/u_audio: add feedback endpoint support" >>>>>> >>>>>> Ruslan's 3 patches are related to each other so I reverted all >>>>>> three 24f779da...e89bb428 and applied the reverts to rc1. >>>>>> >>>>>> I can confirm this indeed resolves the problem in rc1. >>>>>> >>>>>> Is late now, tomorrow evening I will apply the reverts to rc6. >>>>> >>>>> With these reverts rc6 works fine as well. >>>>> >>>>> So, where do we go from here? >>>>> >>>> >>>> I know the patches have been tested on dwc2 (by me and others).  I >>>> do not know if Ruslan or Jerome tested them on dwc3 but probably >>>> not. Ruslan has talked about RPi (my case too) and BeagleboneBlack, >>>> both with dwc2. Perhaps the dwc2 behaves a bit differently than dwc3? >>>> >>>> The patches add a new EP-IN for async feedback. I am sorry I have >>>> not followed your long thread (it started as unrelated to uac). Does >>>> the problem appear with f_uac1 or f_uac2? Please how have you >>>> reached the above problem? >>> >>> I'm sorry too. I first believed the issue was related to the patch >>> mentioned in the subject line. >>> >>> The problem appaers with f_uac2. I bost Edison_Arduino board in host >>> mode (there is a switch allowing to select host/device mode). When >>> flipping the switch to device mode udev run a script: >>> 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 >>> .... >>> >> >> As you say, could perhaps the reason be that the extra EP-IN added in >> those patches (previously 1, now 2 with the default config you use) >> exceeds your EP-IN max count or available fifos somehow?  You have a >> number of functions initialized. If you change the load order of the >> functions, do you get the error later with a different function? Just >> guessing... >> >> You should be able to switch the default async EP-OUT (which >> configures the new feedback EP-IN ) to adaptive EP-OUT (which requires >> no feedback EP) with c_sync=8 parameter of f_uac2. >> >> https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/gadget/function/f_uac2.c#L47 >> >> >> https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/gadget/function/f_uac2.c#L830 >> >> >> https://elixir.bootlin.com/linux/v5.14-rc6/source/include/uapi/linux/usb/ch9.h#L453 >> >> >> Does that fix the problem? > > Not sure how to do that. Do you mean the module should have a parameter > called c_sync? `modinfo` list no parameters for usb_f_uac2. > Those are configfs params, not available in modinfo. I checked and the value is "adaptive" https://elixir.bootlin.com/linux/v5.14-rc7/source/drivers/usb/gadget/function/f_uac2.c#L1312 In your configfs script: # UAC2 device mkdir functions/uac2.usb0 ln -s functions/uac2.usb0 configs/c.1 On the USB Host: cat /proc/asound/Gadget/stream: Playback: Status: Stop Interface 1 Altset 1 Format: S16_LE Channels: 2 Endpoint: 0x01 (1 OUT) (ASYNC) Rates: 64000 Data packet interval: 125 us Bits: 16 Channel map: FL FR Sync Endpoint: 0x82 (2 IN) Sync EP Interface: 1 Sync EP Altset: 1 Implicit Feedback Mode: No lsusb -v -d 1d6b:0104 | | grep EP.*IN bEndpointAddress 0x81 EP 1 IN bEndpointAddress 0x82 EP 2 IN bEndpointAddress 0x83 EP 3 IN I have additional patches applied which define controls via EP IN interrupt mode, not part of that patchset. Switching to the adaptive mode: # UAC2 device mkdir functions/uac2.usb0 echo "adaptive" > functions/uac2.usb0/c_sync ln -s functions/uac2.usb0 configs/c.1 On the USB Host: cat /proc/asound/Gadget/stream: Playback: Status: Stop Interface 1 Altset 1 Format: S16_LE Channels: 2 Endpoint: 0x01 (1 OUT) (ADAPTIVE) Rates: 64000 Data packet interval: 125 us Bits: 16 Channel map: FL FR lsusb -v -d 1d6b:0104 | grep EP.*IN bEndpointAddress 0x81 EP 1 IN bEndpointAddress 0x82 EP 2 IN The feedback EP-IN is gone because the mode is adaptive now. If you think the new input endpoints should not be created by default for resource-compatibility reasons, the adaptive mode can be set by default in a fixed patch. Also the patches defining the new interrupt endpoints can have the controls disabled by default (and not allocate the EP-IN). These patches on top of the async patches are already accepted by Greg for usb-next branch https://kernel.googlesource.com/pub/scm/linux/kernel/git/gregkh/usb/+/eaf6cbe0992052a46d93047dc122fad5126aa3bd . That's why I was trying to sort out the async patches without reverting them as it will call for more reverts. Thanks, Pavel.