MFC: r292180 (partial), r297127 (partial), r311911, r311923, r312939,
r313250, r313712, r314811 (partial), r314887 (partial), r315430,
r317981, r315466

o Move the DRIVER_MODULE() statements that declare mmc(4) to be a child
of the various bridge drivers out of dev/mmc.c and into the bridge
drivers.

o Add ACPI platform support for SDHCI driver.

o Fix some overly long lines, whitespace and other bugs according to
style(9) as well as spelling etc. in mmc(4), mmcsd(4) and sdhci(4).

o In the mmc(4) bridges and sdhci(4) (bus) front-ends:
- Remove redundant assignments of the default bus_generic_print_child
device method,
- use DEVMETHOD_END,
- use NULL instead of 0 for pointers.

o Trim/adjust includes.

o Add and use a MMC_DECLARE_BRIDGE macro for declaring mmc(4) bridges
as kernel drivers and their dependency onto mmc(4).

o Add support for eMMC "partitions". Besides the user data area, i. e.
the default partition, eMMC v4.41 and later devices can additionally
provide up to:
1 enhanced user data area partition
2 boot partitions
1 RPMB (Replay Protected Memory Block) partition
4 general purpose partitions (optionally with a enhanced or extended
attribute)

Besides simply subdividing eMMC devices, some Intel NUCs having UEFI
code in the boot partitions etc., another use case for the partition
support is the activation of pseudo-SLC mode, which manufacturers of
eMMC chips typically associate with the enhanced user data area and/
or the enhanced attribute of general purpose partitions.

CAVEAT EMPTOR: Partitioning eMMC devices is a one-time operation.

o Now that properly issuing CMD6 is crucial (so data isn't written to
the wrong partition for example), make a step into the direction of
correctly handling the timeout for these commands in the MMC layer.
Also, do a SEND_STATUS when CMD6 is invoked with an R1B response as
recommended by relevant specifications.

o Add an IOCTL interface to mmcsd(4); this is sufficiently compatible
with Linux so that the GNU mmc-utils can be ported to and used with
FreeBSD (note that due to the remaining deficiencies outlined above
SANITIZE operations issued by/with `mmc` currently most likely will
fail). These latter have been added to ports as sysutils/mmc-utils.
Among others, the `mmc` tool of mmc-utils allows for partitioning
eMMC devices (tested working).

o For devices following the eMMC specification v4.41 or later, year 0
is 2013 rather than 1997; so correct this for assembling the device
ID string properly.

o Let mmcsd.ko depend on mmc.ko. Additionally, bump MMC_VERSION as at
least for some of the above a matching pair is required.

MFC r291310:

Stop building vers.c in include/ and only build the needed osreldate.h.

Because of how osreldate.h was being built with newvers.sh, which always
spat out a vers.c dependent on SVN or git, the meta mode build was
considering osreldate.h to depend on the current git or SVN index. This
would lead to entire tree rebuilds when modifying git's index. There's
no reason to be generating vers.c here so just skip it.

While here, in mk-osreldate.sh rename PARAM_H to proper PARAMFILE (which
newvers.sh already has a default for) and remove unneeded export.

Sponsored by: EMC / Isilon Storage Division

MFC 310048,310101

310048
hyperv: Implement "enlightened" time counter, which is rdtsc based.

Reviewed by: kib
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8763

310101
hyperv: Allow userland to ro-mmap reference TSC page

This paves way to implement VDSO for the enlightened time counter.

Reviewed by: kib
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8768

MFC 308664,308742,308743

308664
hyperv/vss: Add driver and tools for VSS

VSS stands for "Volume Shadow Copy Service". Unlike virtual machine
snapshot, it only takes snapshot for the virtual disks, so both
filesystem and applications have to aware of it, and cooperate the
whole VSS process.

This driver exposes two device files to the userland:

/dev/hv_fsvss_dev

Normally userland programs should _not_ mess with this device file.
It is currently used by the hv_vss_daemon(8), which freezes and
thaws the filesystem. NOTE: currently only UFS is supported, if
the system mounts _any_ other filesystems, the hv_vss_daemon(8)
will veto the VSS process.

If hv_vss_daemon(8) was disabled, then this device file must be
opened, and proper ioctls must be issued to keep the VSS working.

/dev/hv_appvss_dev

Userland application can opened this device file to receive the
VSS freeze notification, hold the VSS for a while (mainly to flush
application data to filesystem), release the VSS process, and
receive the VSS thaw notification i.e. applications can run again.

The VSS will still work, even if this device file is not opened.
However, only filesystem consistency is promised, if this device
file is not opened or is not operated properly.

hv_vss_daemon(8) is started by devd(8) by default. It can be disabled
by editting /etc/devd/hyperv.conf.

Submitted by: Hongjiang Zhang <honzhan microsoft com>
Reviewed by: kib, mckusick
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8224

308742
hyperv/vss: Nuke unused variables.

Submitted by: markj
Reported by: markj
Sponsored by: Microsoft

308743
hyperv/vss: Install the userland daemon to /usr/sbin instead of /

Submitted by: markj
Reported by: markj
Sponsored by: Microsoft

MFC r307131: install header files required development with libzfs_core

MFC r289393:

Add more SUBDIR_PARALLEL.

MFC r278204:

Sort the entries by build knob, then MACHINE_ARCH like other areas of the tree

Sponsored by: EMC / Isilon Storage Division

MFC r278135,r278202:

r278135 (by amdmi3):

- Remove more files when MK_USB == no

Reviewed by: ngie
Approved by: ngie
Differential Revision: D1600

r278202:

Clean up more usb related files when MK_USB == no when dealing with
manpages, libraries, and binaries

Sponsored by: EMC / Isilon Storage Division

MFC 273598 273602 273607 273613 273647:

Userland HPET support.

MFC r267441:

Don't install GSS-API headers when the GSSAPI option has been disabled.
Some ports assume GSS-API is supported when they find the headers.

PR: 189156
Submitted by: Garrett Cooper <yanegomi@gmail.com>

Merge r257485: install netpfil/pf includes.

Bulk sync of pf changes from head, in attempt to fixup broken build I
made in r263029.

Merge r257186,257215,257349,259736,261797.

These changesets split pfvar.h into several smaller headers and make
userland utilities to include only some of them.

MFC r257583, r258012, r258013:

r257583 (peter):
Remove the WITH_LIBICONV_COMPAT hack that seems to do more harm
than good. This caused libc to spoof the ports libiconv namespace
and provide a colliding libiconv.so.3 to fool rtld. This should
have been removed some time ago.

r258012:
Remove WITH_LIBICONV_COMPAT file to chase after r257583.

r258013:
Regenerate src.conf.5 after removal of WITH_LIBICONV_COMPAT.

Approved by: re (kib)
Sponsored by: The FreeBSD Foundation

Sponsored by: The FreeBSD Foundation

MFC r278204:

Sort the entries by build knob, then MACHINE_ARCH like other areas of the tree

Sponsored by: EMC / Isilon Storage Division

MFC r278135,r278202:

r278135 (by amdmi3):

- Remove more files when MK_USB == no

Reviewed by: ngie
Approved by: ngie
Differential Revision: D1600

r278202:

Clean up more usb related files when MK_USB == no when dealing with
manpages, libraries, and binaries

Sponsored by: EMC / Isilon Storage Division

MFC 273598 273602 273607 273613 273647:

Userland HPET support.

MFC r267441:

Don't install GSS-API headers when the GSSAPI option has been disabled.
Some ports assume GSS-API is supported when they find the headers.

PR: 189156
Submitted by: Garrett Cooper <yanegomi@gmail.com>

Merge r257485: install netpfil/pf includes.

Bulk sync of pf changes from head, in attempt to fixup broken build I
made in r263029.

Merge r257186,257215,257349,259736,261797.

These changesets split pfvar.h into several smaller headers and make
userland utilities to include only some of them.

MFC r257583, r258012, r258013:

r257583 (peter):
Remove the WITH_LIBICONV_COMPAT hack that seems to do more harm
than good. This caused libc to spoof the ports libiconv namespace
and provide a colliding libiconv.so.3 to fool rtld. This should
have been removed some time ago.

r258012:
Remove WITH_LIBICONV_COMPAT file to chase after r257583.

r258013:
Regenerate src.conf.5 after removal of WITH_LIBICONV_COMPAT.

Approved by: re (kib)
Sponsored by: The FreeBSD Foundation

Sponsored by: The FreeBSD Foundation