Improve periodic USB transfers (device intr, isoc) used for input
devices, audio, and video. It's still not perfect, and will need
further improvements.

High level, the diff contains following chan

Improve periodic USB transfers (device intr, isoc) used for input
devices, audio, and video. It's still not perfect, and will need
further improvements.

High level, the diff contains following changes:

* Sync up with the Linux code base, which did re-work the periodic
scheduling code path.
* Run the driver in IPL_VM instead of IPL_USB to prioritize us before
lower/equal interrupts (same what NetBSD does).
* Add two new flags to our USB stack required by the updated driver
code:
- 'multi' flag in the usbd_hub structure to keep track whether
a hub has one Transaction Translator for all ports (single TT)
or one Transaction Translator per port (multi TT).
- 'hcpriv' pointer in the usbd_tt structure for the HC driver to
allocate memory for the scheduling depending on single or multi TT.

"go for it" kettenis@

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Revert list_move() to list_move_tail() change from last commit since it
turned out that it has a negative impact to isoc transfers timing with our
driver implementation.

Implemented from the Linux driver:

* Introduce split transaction order queues.
* Improve the NAK interrupt handler routine.
* Mostly move from list_move() to list_move_tail().

Those changes fix an

Implemented from the Linux driver:

* Introduce split transaction order queues.
* Improve the NAK interrupt handler routine.
* Mostly move from list_move() to list_move_tail().

Those changes fix an attachment problem seen for certain devices which
are issuing NAK interrupts during split transactions, which don't get
handled correctly by the driver today. This could result in unexpected
channel halting, printing "ChHltd set, but reason is unknown", which
finally leaves the device back on a disabled USB port.

ok kettenis@

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Sync dwctwo(4) with the NetBSD-current code base.

On the Raspberry Pi 3 Model B+ this does as a benefit:

* Enable the USB on-board Ethernet controller through mue(4).
* Enable the two USB uhub2 p

Sync dwctwo(4) with the NetBSD-current code base.

On the Raspberry Pi 3 Model B+ this does as a benefit:

* Enable the USB on-board Ethernet controller through mue(4).
* Enable the two USB uhub2 ports for removable devices.

Feedback incorporated from kettenis@ and jsg@.

ok kettenis@

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If you use sys/param.h, you don't need sys/types.h

kill RCSID macros; discussed with millert

Check the validity of the `qtd' pointer after each interrupt case
and bail out if the pointer has become invalid. This prevents
use-after-free memory accesses that corrupted the dwc2qtd pool.

This f

Check the validity of the `qtd' pointer after each interrupt case
and bail out if the pointer has become invalid. This prevents
use-after-free memory accesses that corrupted the dwc2qtd pool.

This fix improves stability on the Raspberry Pi 3.

From Linux commit dc8730846948e517169f630826cd2c97615f5ee8
OK kettenis@

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Replace dummy mutex asserts with real ones.

OK stsp@

Convert list_head lists into TAILQs and LISTs and fix up header includes
so we can build dwc2 without extra stuff.

tested by several edgerouter lite owners, ok jasper@

De-static for backtracing, but using #define to not change indent (for now).

s/mutex/mtx/
s/pool_cache/pool/
s/callout/timeout/
s/kmem/malloc/
s/workqueue/taskq/
s/softint/softintr/

Convert header paths.

Add RCS IDs.

Redo dwc2 import with CVS tags expanded.

Import dwc2 core and glue code from NetBSD. OK deraadt@ jsing@ miod@ mpi@