Improve the XHCI command timeout recovery handling code.

MFC after: 1 week

Merge from head

IFC @ r254014

IFC @253398

Merge fresh head.

Add convenience wrapper functions to run callbacks in the context of the
USB explore thread.

sync from head

IFC @247348.

Resolve a LOR after r246616. Protect control requests using the USB device
enumeration lock. Make sure all callers of usbd_enum_lock() check the return
value. Remove the control transfer specific loc

Resolve a LOR after r246616. Protect control requests using the USB device
enumeration lock. Make sure all callers of usbd_enum_lock() check the return
value. Remove the control transfer specific lock. Bump the FreeBSD version
number, hence external USB modules may need to be recompiled due to a USB
device structure change.

MFC after: 1 week

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Sync with HEAD.

Add defines to more easily allow a single threaded version of the FreeBSD
USB stack. This is useful for non-kernel purposes, like the loader.

Use DEVMETHOD_END macro defined in sys/bus.h instead of {0, 0} sentinel on device_method_t arrays

Reviewed by: cognet
Approved by: cognet

Modify the FreeBSD USB kernel code so that it can be compiled directly
into the FreeBSD boot loader, typically for non-USB aware BIOSes, EFI systems
or embedded platforms. This is also useful for out

Modify the FreeBSD USB kernel code so that it can be compiled directly
into the FreeBSD boot loader, typically for non-USB aware BIOSes, EFI systems
or embedded platforms. This is also useful for out of the system compilation
of the FreeBSD USB stack for various purposes. The USB kernel files can
now optionally include a global header file which should include all needed
definitions required to compile the FreeBSD USB stack. When the global USB
header file is included, no other USB header files will be included by
default.

Add new file containing the USB stack configuration for the
FreeBSD loader build.

Replace some __FBSDID()'s by /* $FreeBSD$ */ comments. Now all
USB files follow the same style.

Use cases:
- console in loader via USB
- loading kernel via USB

Discussed with: Hiroki Sato, hrs @ EuroBSDCon

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MFC

MFC @ r241285

IFC @ r242684

Sync from head

Add missing CTLFLAG_TUN flag to tunable sysctls in USB stack.
Rearrange the tunables and belonging sysctl declarations, so
that they are next to eachother.

Submitted by: n_hibma @
MFC after: 1 week

Add support for DWC OTG.

MFC

IFC @ r234692

sys/amd64/include/cpufunc.h
sys/amd64/include/fpu.h
sys/amd64/amd64/fpu.c
sys/amd64/vmm/vmm.c

- Add API to allow vmm FPU state init/save/restore.

FP stuff discussed with: kib

Merge head up to r232685 to projects/pf/head.

Make sure that the USB system suspend event is executed synchronously
and not asynchronously. This fixes problems related to USB system
suspend and resume. It is assumed that we are always allowed t

Make sure that the USB system suspend event is executed synchronously
and not asynchronously. This fixes problems related to USB system
suspend and resume. It is assumed that we are always allowed to sleep
from the device_suspend() method.

MFC after: 1 week
Submitted by: jkim

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IFC @230489 (pending review).

IFC to head to catch up the bhyve branch

Approved by: grehan@