Bug 218695 - Datadump for error `ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1`
Summary: Datadump for error `ERROR Transfer event TRB DMA ptr not part of current TD e...
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: USB (show other bugs)
Hardware: All Linux
: P3 normal
Assignee: Default virtual assignee for Drivers/USB
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2024-04-08 16:31 UTC by Paul Menzel
Modified: 2024-04-12 07:40 UTC (History)
2 users (show)

See Also:
Kernel Version:
Subsystem:
Regression: No
Bisected commit-id:

Attachments
Linux 6.9-rc2+ messages debug v2 patch (output of `dmesg`) (270.22 KB, text/plain)
2024-04-08 16:31 UTC, Paul Menzel 		Details
Compressed trace `/sys/kernel/debug/tracing/trace` (281.34 KB, application/x-7z-compressed)
2024-04-08 16:34 UTC, Paul Menzel 		Details
Output of `git grep -l 'ERROR Transfer event TRB DMA'` (29.48 KB, text/plain)
2024-04-12 07:40 UTC, Paul Menzel 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Paul Menzel 2024-04-08 16:31:45 UTC 
Created attachment 306106 [details]
Linux 6.9-rc2+ messages debug v2 patch (output of `dmesg`)

https://lore.kernel.org/linux-usb/1f64af9a-0618-a7da-4acc-f043b6580308@linux.intel.com/T/#t

This is just for attaching trace files and Linux messages.

```
echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control
echo 'module xhci_hcd =p' | sudo tee /sys/kernel/debug/dynamic_debug/control
echo 'module usbcore =p' | sudo tee /sys/kernel/debug/dynamic_debug/control 
echo 81920 | sudo tee /sys/kernel/debug/tracing/buffer_size_kb
echo 1 | sudo tee /sys/kernel/debug/tracing/events/xhci-hcd/enable 
echo 1 | sudo tee /sys/kernel/debug/tracing/tracing_on
echo 0 | sudo tee /sys/kernel/debug/tracing/tracing_on
echo 'module usbcore -p' | sudo tee /sys/kernel/debug/dynamic_debug/control
echo 0 | sudo tee /sys/kernel/debug/tracing/events/xhci-hcd/enable
echo 'module xhci_hcd -p' | sudo tee /sys/kernel/debug/dynamic_debug/control
```
Comment 1 Paul Menzel 2024-04-08 16:34:17 UTC 
Created attachment 306107 [details]
Compressed trace `/sys/kernel/debug/tracing/trace`

Command for compression:

    7z a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on trace.7z trace
Comment 2 Mathias Nyman 2024-04-09 11:24:52 UTC 
The trace shows hosts sends duplicate transfer events for ISOC TRBs
after a Transaction error on same device. This transaction error is probably
due to device disconnect. 

Transfer events for TRB ..a1c0 twice, with a transaction error in between:

 <idle>-0       [000] d.h2. 33819.709897: xhci_handle_event: EVENT: TRB 00000032959a1c0 status 'Success' len 0 slot 6 ep 2 type 'Transfer Event' flags e:c
 <idle>-0       [000] d.h2. 33819.709904: xhci_handle_event: EVENT: TRB 000000041547d010 status 'USB Transaction Error' len 4 slot 6 ep 15 type 'Transfer Event' flags e:c
 systemd-journal-395     [000] d.H1. 33819.711886: xhci_handle_event: EVENT: TRB 000000032959a1c0 status 'Success' len 0 slot 6 ep 2 type 'Transfer Event' flags e:c

Transfer events for TRB ..a1d0 twice (the next TRB)
 systemd-journal-395     [000] d.H1. 33819.712001: xhci_handle_event: EVENT: TRB 000000032959a1d0 status 'Success' len 0 slot 6 ep 2 type 'Transfer Event' flags e:c
 systemd-journal-395     [000] d.H1. 33819.712059: xhci_handle_event: EVENT: TRB 000000032959a1d0 status 'Success' len 0 slot 6 ep 2 type 'Transfer Event' flags e:c

Transfer events for TRB ..a1e0 twice
 systemd-journal-395     [000] d.H1. 33819.712139: xhci_handle_event: EVENT: TRB 000000032959a1e0 status 'Success' len 0 slot 6 ep 2 type 'Transfer Event' flags e:c
 systemd-journal-395     [000] d.h1. 33819.712871: xhci_handle_event: EVENT: TRB 000000032959a1e0 status 'Success' len 0 slot 6 ep 2 type 'Transfer Event' flags e:c

etc..

Driver can cope with these extra events, but if this is common we should
probably handle it silently and not concern users with that ERROR message.
Comment 3 Paul Menzel 2024-04-12 07:40:30 UTC 
Created attachment 306135 [details]
Output of `git grep -l 'ERROR Transfer event TRB DMA'`

The Linux messages collected by *Hardware for Linux*, dated May 9th, 2023, contain 287 probes (uploads) with that error.

[1]: https://github.com/linuxhw/Dmesg
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