[Bug 217122] Regression in xhci driver since 6.1 "Transfer event TRB DMA ptr not part of current TD"

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217122

Mathias Nyman (mathias.nyman@linux.intel.com) changed:

           What    |Removed                     |Added
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                 CC|                            |mathias.nyman@linux.intel.c
                   |                            |om

--- Comment #3 from Mathias Nyman (mathias.nyman@linux.intel.com) ---
Controller sent a transfer completion event for a transfer block (TRB) queued
at *c740 in the ring buffer, but driver is still waiting for a completion of
the previous transfer at *c730.

If git bisect doesn't point to a clear cause then xhci tracing and dynamic
debug could show what happened to that lost transfer.

steps for xhci trace and dynamic debug:

< disconnect all extra unrelated usb devices >
mount -t debugfs none /sys/kernel/debug
echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control
echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control
echo 81920 > /sys/kernel/debug/tracing/buffer_size_kb
echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable
echo 1 > /sys/kernel/debug/tracing/tracing_on
< Reproduce issue >
Send output of dmesg
Send content of /sys/kernel/debug/tracing/trace

Trace file grows quickly so try to copy it as soon as possible after triggering
the issue.

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