On Mon, Mar 22, 2021 at 10:06 PM Wesley Cheng <wcheng@xxxxxxxxxxxxxx> wrote: > > Hi Andy, > > On 3/22/2021 12:34 PM, Andy Shevchenko wrote: > > On Mon, Mar 22, 2021 at 8:49 PM Wesley Cheng <wcheng@xxxxxxxxxxxxxx> wrote: > >> > >> Hi Andy, > >> > >> On 3/22/2021 5:48 AM, Andy Shevchenko wrote: > >>> On Fri, Mar 12, 2021 at 2:01 AM Wesley Cheng <wcheng@xxxxxxxxxxxxxx> wrote: > >>>> > >>>> In the situations where the DWC3 gadget stops active transfers, once > >>>> calling the dwc3_gadget_giveback(), there is a chance where a function > >>>> driver can queue a new USB request in between the time where the dwc3 > >>>> lock has been released and re-aquired. This occurs after we've already > >>>> issued an ENDXFER command. When the stop active transfers continues > >>>> to remove USB requests from all dep lists, the newly added request will > >>>> also be removed, while controller still has an active TRB for it. > >>>> This can lead to the controller accessing an unmapped memory address. > >>>> > >>>> Fix this by ensuring parameters to prevent EP queuing are set before > >>>> calling the stop active transfers API. > >>> > >>> > >>> commit f09ddcfcb8c569675066337adac2ac205113471f > >>> Author: Wesley Cheng <wcheng@xxxxxxxxxxxxxx> > >>> Date: Thu Mar 11 15:59:02 2021 -0800 > >>> > >>> usb: dwc3: gadget: Prevent EP queuing while stopping transfers > >>> > >>> effectively broke my gadget setup. > >>> > >>> The output of the kernel (followed by non responsive state of USB controller): > >>> > >>> [ 195.228586] using random self ethernet address > >>> [ 195.233104] using random host ethernet address > >>> [ 195.245306] usb0: HOST MAC aa:bb:cc:dd:ee:f2 > >>> [ 195.249732] usb0: MAC aa:bb:cc:dd:ee:f1 > >>> # [ 195.773594] IPv6: ADDRCONF(NETDEV_CHANGE): usb0: link becomes ready > >>> [ 195.780585] ------------[ cut here ]------------ > >>> [ 195.785217] dwc3 dwc3.0.auto: No resource for ep2in > >>> [ 195.790162] WARNING: CPU: 0 PID: 217 at > >>> drivers/usb/dwc3/gadget.c:360 dwc3_send_gadget_ep_cmd+0x4b9/0x670 > >>> [ 195.799760] Modules linked in: usb_f_eem u_ether libcomposite > >>> brcmfmac brcmutil mmc_block pwm_lpss_pci pwm_lps > >>> s snd_sof_pci_intel_tng snd_sof_pci snd_sof_acpi_intel_byt > >>> snd_sof_intel_ipc snd_sof_acpi snd_sof snd_sof_nocodec > >>> spi_pxa2xx_platform snd_sof_xtensa_dsp spi_pxa2xx_pci > >>> extcon_intel_mrfld intel_mrfld_adc sdhci_pci cqhci sdhci m > >>> mc_core intel_mrfld_pwrbtn intel_soc_pmic_mrfld hci_uart btbcm btintel > >>> [ 195.835604] CPU: 0 PID: 217 Comm: irq/16-dwc3 Not tainted 5.12.0-rc4+ #60 > >>> [ 195.842403] Hardware name: Intel Corporation Merrifield/BODEGA BAY, > >>> BIOS 542 2015.01.21:18.19.48 > >>> [ 195.851191] RIP: 0010:dwc3_send_gadget_ep_cmd+0x4b9/0x670 > >>> [ 195.856608] Code: cd 00 00 00 44 89 44 24 20 48 89 4c 24 18 e8 ee > >>> f7 e4 ff 48 8b 4c 24 18 4c 89 f2 48 c7 c7 b9 > >>> ed 4f a0 48 89 c6 e8 ef 24 43 00 <0f> 0b 41 be ea ff ff ff 44 8b 44 24 > >>> 20 e9 80 fc ff ff 41 83 fe 92 > >>> [ 195.875381] RSP: 0000:ffffa53c00373ba8 EFLAGS: 00010086 > >>> [ 195.880617] RAX: 0000000000000000 RBX: 0000000000001387 RCX: 00000000ffffdfff > >>> [ 195.887755] RDX: 00000000ffffdfff RSI: 00000000ffffffea RDI: 0000000000000000 > >>> [ 195.894893] RBP: ffff9ce8c8f2b028 R08: ffffffffa0732288 R09: 0000000000009ffb > >>> [ 195.902034] R10: 00000000ffffe000 R11: 3fffffffffffffff R12: 0000000000041006 > >>> [ 195.909170] R13: ffffa53c00373c24 R14: ffff9ce8c11dadb0 R15: ffff9ce8c2861700 > >>> [ 195.916310] FS: 0000000000000000(0000) GS:ffff9ce8fe200000(0000) > >>> knlGS:0000000000000000 > >>> [ 195.924409] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > >>> [ 195.930161] CR2: 00000000f7f694a0 CR3: 0000000038e0c000 CR4: 00000000001006f0 > >>> [ 195.937300] Call Trace: > >>> [ 195.939755] __dwc3_gadget_ep_enable+0x2d4/0x4e0 > >>> [ 195.944393] ? dwc3_remove_requests.constprop.0+0x86/0x170 > >> > >> Odd that this change would affect the USB enablment path, as they were > >> focused on the pullup disable path. Would you happen to have any > >> downstream changes on top of v5.12-rc4 we could review to see if they > >> are still required? (ie where is the dwc3_remove_requests() coming from > >> during ep enable) > > > > You may check my branch [1] on GH. Basically you may be interested in > > the commit: > > 0f86df1294ee7523060cc16eafaf4898c693eab0 REVERTME: usb: dwc3: gadget: > > skip endpoints ep[18]{in,out} > > Otherwise it's a clean v5.12-rc4 with a revert and another USB PHY > > suspend fix (which also shouldn't affect this). > > Can you link your GH reference? Oops, sorry. Here we are: [1]: https://github.com/andy-shev/linux/tree/eds-acpi > > > > But I don't believe it should have affected this. > > > >>> [ 195.949897] dwc3_gadget_ep_enable+0x5d/0x120 > >>> [ 195.954274] usb_ep_enable+0x27/0x80 > >>> [ 195.957869] gether_connect+0x32/0x1f0 [u_ether] > >>> [ 195.962512] eem_set_alt+0x6d/0x140 [usb_f_eem] > >>> [ 195.967061] composite_setup+0x224/0x1ba0 [libcomposite] > >>> [ 195.972405] ? debug_dma_unmap_page+0x79/0x80 > >>> [ 195.976782] ? configfs_composite_setup+0x6b/0x90 [libcomposite] > >>> [ 195.982811] configfs_composite_setup+0x6b/0x90 [libcomposite] > >>> [ 195.988668] dwc3_ep0_interrupt+0x459/0xa50 > >>> [ 195.992869] dwc3_thread_interrupt+0x8e2/0xee0 > >>> [ 195.997327] ? __schedule+0x237/0x6d0 > >>> [ 196.001005] ? disable_irq_nosync+0x10/0x10 > >>> [ 196.005200] irq_thread_fn+0x1b/0x60 > >>> [ 196.008789] irq_thread+0xd6/0x170 > >>> [ 196.012202] ? irq_thread_check_affinity+0x70/0x70 > >>> [ 196.017004] ? irq_forced_thread_fn+0x70/0x70 > >>> [ 196.021373] kthread+0x116/0x130 > >>> [ 196.024617] ? kthread_create_worker_on_cpu+0x60/0x60 > >>> [ 196.029680] ret_from_fork+0x22/0x30 > >>> [ 196.033272] ---[ end trace 8dd104a950d8d248 ]--- > >>> > >>> > >> Also, as I mentioned above, the changes should affect the pullup disable > >> path, so when you 'echo "" > UDC' or something similar to that > >> operation, did you see any errors? > > > > After your patch I see a warning as above. Before — no errors or warnings. > > > >> Can you provide a ftrace output w/ > >> the DWC3 tracing enabled once removing the UDC? > > > > Can you provide step-by-step instructions what should I do? > > > Let me try with your kernel, and steps below first. > > Thanks > Wesley Cheng > > >>> Revert helps (I'm on v5.12-rc4 now with a revert). > >>> > >>> The script to enable gadget: > >>> > >>> #!/bin/sh -efu > >>> > >>> # Mounting CONFIGFS > >>> grep -q -w /sys/kernel/config /proc/mounts || mount -t configfs none > >>> /sys/kernel/config > >>> > >>> # Addresses and files > >>> readonly GADGET_BASE_DIR="/sys/kernel/config/usb_gadget/g1" > >>> readonly DEV_ETH_ADDR="aa:bb:cc:dd:ee:f1" > >>> readonly HOST_ETH_ADDR="aa:bb:cc:dd:ee:f2" > >>> readonly USBDISK="/usbdisk.img" > >>> > >>> # Insert modules > >>> modprobe libcomposite > >>> > >>> # Create directory structure > >>> mkdir "${GADGET_BASE_DIR}" > >>> cd "${GADGET_BASE_DIR}" > >>> mkdir -p configs/c.1/strings/0x409 > >>> mkdir -p strings/0x409 > >>> > >>> # 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/ > >>> > >>> # Composite Gadget Setup > >>> echo 0x1d6b > idVendor # Linux Foundation > >>> echo 0x0104 > idProduct # Multifunction Composite Gadget > >>> echo 0x0100 > bcdDevice # v1.0.0 > >>> echo 0x0200 > bcdUSB # USB2 > >>> echo "0123456789abcdef" > strings/0x409/serialnumber > >>> echo "USBArmory" > strings/0x409/manufacturer > >>> echo "USBArmory Gadget" > strings/0x409/product > >>> echo "Conf1" > configs/c.1/strings/0x409/configuration > >>> echo 120 > configs/c.1/MaxPower > >>> > >>> # Activate gadgets > >>> echo dwc3.0.auto > UDC > >>> > >>> Please, tell me how to fix this, otherwise I will have to send a revert. > >>> > >> This also fixes a potential SMMU fault on targets with that enabled. It > >> causes the controller to access a stale TRB DMA address after it has > >> already been unmapped. I think we should figure out what is causing the > >> issue on your set up instead of reverting the entire change. > > > > If we find a cause and have a fix during this week, otherwise it's > > rc5:ish timing when we may not have more time to play. > > > > -- > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project -- With Best Regards, Andy Shevchenko