Sorry for the empty message. I would like to add Joerg Roedel and IOMMU related maillist in case they can help on this issue.
пн, 23 нояб. 2020 г. в 16:32, Matwey V. Kornilov <korni...@physics.msu.ru>: > > пн, 23 нояб. 2020 г. в 14:19, Thimo Emmerich <thimo.emmer...@sony.com>: > > > > Hi, > > > > thanks for your prompt answer. Unfortunately I was out of office on Friday. > > > > Here the updates: > > - Tracing showed the lines you mentioned. > > - Updating the kernel to the latest stable (v5.9.10) did not change > > anything. > > - Adding "amd_iommu=off" fixes the issue (of course including > > dysfunctional IOMMU) > > > > Best regards, > > Thimo > > > > On 20.11.20 08:55, Matwey V. Kornilov wrote: > > > Hi, > > > > > > As far as I understand, the driver itself works correctly. It > > > communicates with the device and receives the data. Only difference is > > > that the data is zeroed. If so, it means that the memory is allocated > > > without errors and the DMA is also mapped without errors. Otherwise, > > > you would get an error when trying to open the device/start stream. To > > > finally prove this, could you please use tracing points to see what is > > > going on while the video stream is on? > > > > > > mount -ttracefs tracefs /sys/kernel/tracing > > > cd /sys/kernel/tracing > > > echo 1 > events/pwc/enable > > > echo 1 > tracing_on > > > cat trace > > > > > > And then you should see lots of lines like the following when video > > > stream is running: > > > > > > -0 [002] ..s. 34645.185239: pwc_handler_enter: dev=Philips webcam > > > 1-1.4:1.0 (fbuf=00000000303a809e filled=31581) urb=000000007e3783c4 > > > (status=0 actual_length=9570) > > > -0 [002] ..s. 34645.185244: pwc_handler_exit: dev=Philips webcam > > > 1-1.4:1.0 (fbuf=00000000303a809e filled=41151) urb=000000007e3783c4 > > > > > > Use > > > > > > echo 0 > tracing_on > > > > > > to disable the recording. > > > > > > > > > I've found a commit that claims to fix an issue with similar wording: > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_torvalds_linux_commit_27d2dcb1b95c8c39da417839c11eda2e665cd389&d=DwIFaQ&c=fP4tf--1dS0biCFlB0saz0I0kjO5v7-GLPtvShAo4cc&r=uorjfjHlvtqEyqWp5b8YlexJq-ujpFniwt87GU9IrXI&m=ZPgwadRZcYtXJwzoIM6ibrGC8jNcJkKloZFNKDK6PBE&s=pC6Xy7iT5Yf6nx7dSNiDOCvvCs7HENylTiquLeJ_0Og&e= > > > > > > Could you please try to boot with "amd_iommu=off" kernel command line > > > parameter and see what happens? > > > Is it also possible for you to check the latest kernel version on your > > > setup? > > > > > > > > > чт, 19 нояб. 2020 г. в 18:49, Thimo Emmerich <thimo.emmer...@sony.com>: > > > > > > > > >> Hi, > > >> > > >> not sure about the application behaviour. > > >> I observed this green screen in MS Teams. For easy verification I used > > >> "cheese" which shows a live stream. Same behaviour. > > >> The issue is 100% reproducible: loading the stock Ubuntu (HWE) kernel > > >> module --> green screen, unloading and loading patched module --> > > >> picture. > > >> For this procedure it is even not necessary to disconnect the cam itself. > > >> > > >> I did now also another test excluding possible application magic: > > >> dd if=/dev/video0 of=/tmp/vid.raw bs=460800 count=20 > > >> If I interpret this data as a video (640x720), with the patched module, > > >> I see a running sequence whereas with the stock module there are just > > >> zeros. Of course, the zeros interpreted as YCbCr stream lead to a still > > >> green image. > > >> > > >> I am using the stock Ubuntu HWE kernel (linux-image-5.4.0-53-generic), > > >> config is attached. > > >> I have to admit that I did not use the Ubuntu-patched kernel sources but > > >> the v5.4 tagged sources from git.kernel.org since I guess there are no > > >> patches in this special section. I also verified building the vanilla > > >> module has the same behaviour as the Ubuntu kernel module (green screen). > > >> > > >> I am not using the virtualization feature (currently). Nevertheless, the > > >> IOMMU is enabled (by default) in the BIOS. > > >> Unfortunately, I do not have another webcam at hand (the other ones are > > >> notebook build-ins). > > >> I checked now with another PC (ancient Intel Xeon system) - the stock > > >> driver works without trouble. > > >> > > >> Do you use/have access to a Ryzen CPU? Maybe there is some > > >> issue/specialty with its IOMMU? > > >> > > >> Best regards, > > >> Thimo Emmerich > > >> > > >> On 19.11.20 14:26, Matwey V. Kornilov wrote: > > >>> Hi, > > >>> > > >>> I've just checked my PWC900 camera at kernel 5.9.8 and unfortunately > > >>> It works perfectly, so there issue is probably deeper. > > >>> > > >>> You say that you see the green image. Could you ensure that the green > > >>> image is what you actually get from the kernel driver, but not an > > >>> application behaviour when there are no frames. > > >>> Could you also provide your kernel build config? I see that you are > > >>> running some kind of hardware assisted virtualization, right? May I > > >>> also ask you to look for some other USB webcam (other model) around > > >>> you and check if it works at the same configuration? > > >>> > > >>> > > >>> чт, 19 нояб. 2020 г. в 14:59, Thimo Emmerich<thimo.emmer...@sony.com>: > > >>> > > >>>> Hi Matwey, > > >>>> > > >>>> I am using a Philips SPC 900NC USB webcam on my Ubuntu 18.04 system. > > >>>> Recently I upgraded from the stock kernel (4.15) to the latest HWE > > >>>> kernel (5.4). > > >>>> > > >>>> Unfortunately my camera was not working anymore. Instead a green image > > >>>> was shown and a lot of kernel messages were showing up (see below). > > >>>> > > >>>> If I revert the single commit 1161db6776bd1c35257e1e362e91bcb1b3fe4347 > > >>>> from the pwc source, the camera is back. > > >>>> > > >>>> Since I guess you had a good reason to integrate this change, do you > > >>>> have any idea, how this issue could be solved? > > >>>> > > >>>> Best Regards, > > >>>> Thimo Emmerich > > >>>> > > >>>> dmesg events: > > >>>> [Do Nov 19 10:12:50 2020] pwc: Philips SPC 900NC USB webcam detected. > > >>>> [Do Nov 19 10:12:50 2020] pwc: Registered as video0. > > >>>> [Do Nov 19 10:12:50 2020] input: PWC snapshot button as > > >>>> /devices/pci0000:00/0000:00:01.2/0000:02:00.0/0000:03:08.0/0000:06:00.1/usb1/1-6/1-6.4/input/input30 > > >>>> [Do Nov 19 10:12:50 2020] usbcore: registered new interface driver > > >>>> Philips webcam > > >>>> [Do Nov 19 10:13:05 2020] amd_iommu_report_page_fault: 20055 callbacks > > >>>> suppressed > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a5835e00 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a5835eb0 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a5835f68 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a5836000 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a5836024 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a58360e0 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a5836198 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a58361c0 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a5836270 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] xhci_hcd 0000:06:00.1: AMD-Vi: Event logged > > >>>> [IO_PAGE_FAULT domain=0x0011 address=0x5a5836328 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] amd_iommu_report_page_fault: 20045 callbacks > > >>>> suppressed > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a58363e4 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a58364a0 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a583655c flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a5838000 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a58380b0 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a583816c flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a5838228 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a58382e0 flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a583839c flags=0x0020] > > >>>> [Do Nov 19 10:13:05 2020] AMD-Vi: Event logged [IO_PAGE_FAULT > > >>>> device=06:00.1 domain=0x0011 address=0x5a58383c0 flags=0x0020] > > >>>> > > >>>> > > >>>> -- > > >>>> Mit freundlichen Grüßen / with kind regards > > >>>> > > >>>> Thimo Emmerich > > >>>> > > >>>> ------------------------------------------- > > >>>> > > >>>> R&D Center Europe Stuttgart Laboratory 01 > > >>>> > > >>>> Phone: +49 (0) 711 / 5858 - 282 > > >>>> E-mail:thimo.emmer...@eu.sony.com > > >>>> > > >>>> Sony Europe B.V., Zweigniederlassung Deutschland > > >>>> Stuttgart Technology Center > > >>>> Hedelfinger Str. 61, 70327 Stuttgart, Germany > > >>>> > > >>>> Registered at the Court of Berlin-Charlottenburg HRB 129332 B > > >>>> > > >>>> Main Establishment: Sony Europe B.V. > > >>>> Registered Office: The Heights, Brooklands, Weybridge, Surrey, KT13 > > >>>> 0XW, UK > > >>>> Incorporated in the Netherlands No. 71682147 > > >>>> Directors: Hideyuki Furumi, Masaki Kurebayashi, Ricky Londema > > >>>> > > >> -- > > >> Mit freundlichen Grüßen / with kind regards > > >> > > >> Thimo Emmerich > > >> > > >> ------------------------------------------- > > >> > > >> R&D Center Europe Stuttgart Laboratory 01 > > >> > > >> Phone: +49 (0) 711 / 5858 - 282 > > >> E-mail:thimo.emmer...@eu.sony.com > > >> > > >> Sony Europe B.V., Zweigniederlassung Deutschland > > >> Stuttgart Technology Center > > >> Hedelfinger Str. 61, 70327 Stuttgart, Germany > > >> > > >> Registered at the Court of Berlin-Charlottenburg HRB 129332 B > > >> > > >> Main Establishment: Sony Europe B.V. > > >> Registered Office: The Heights, Brooklands, Weybridge, Surrey, KT13 0XW, > > >> UK > > >> Incorporated in the Netherlands No. 71682147 > > >> Directors: Hideyuki Furumi, Masaki Kurebayashi, Ricky Londema > > >> > > > > -- > > Mit freundlichen Grüßen / with kind regards > > > > Thimo Emmerich > > > > ------------------------------------------- > > > > R&D Center Europe Stuttgart Laboratory 01 > > > > Phone: +49 (0) 711 / 5858 - 282 > > E-mail: thimo.emmer...@eu.sony.com > > > > Sony Europe B.V., Zweigniederlassung Deutschland > > Stuttgart Technology Center > > Hedelfinger Str. 61, 70327 Stuttgart, Germany > > > > Registered at the Court of Berlin-Charlottenburg HRB 129332 B > > > > Main Establishment: Sony Europe B.V. > > Registered Office: The Heights, Brooklands, Weybridge, Surrey, KT13 0XW, UK > > Incorporated in the Netherlands No. 71682147 > > Directors: Hideyuki Furumi, Masaki Kurebayashi, Ricky Londema > > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
