Merge r238587 into 20120614 tag
o Typo: IEE -> IEEE.

PR:		docs/173069
Submitted by:	Bjorn Heidotting
MFC after:	1 week
Read Asynchronous Notification statuses only if Port Multiplier or ATAPI
device are connected. ATA disks are not using ANs, while the extra register
read operation is quite expensive.
Unlock IPMI sc while performing requests via KCS and SMIC interfaces.
It is already done in SSIF interface code.
This reduces contention/spinning reported by many users.

PR:		kern/172166
Submitted by:	Eric van Gyzen <eric at vangyzen.net>
MFC after:	2 weeks
Dtrace: add toupper()/tolower() and enhancements to lltostr().

Merge changes from illumos:

1451 DTrace needs toupper()/tolower() subroutines
1457 lltostr() D subroutine should take an optional base

This change bumps the DT_VERS_* number to 1.8.1 in
accordance to what is done in illumos.

The test suite we currently include is outdated and
doesnt support some updates in tst.subr.d which had to
be left out for now.

Illumos Revisions:	r13458 5e394d8db762
			r13459 c3454574dd1a

Reference:
https://www.illumos.org/issues/1451
https://www.illumos.org/issues/1457

Tested by:	Fabian Keil
Obtained from:	Illumos
MFC after:	1 month
hrStorageSize and hrStorageUsed are 32 bit integers, reporting a fs
size and usage in hrStorageAllocationUnits. If the file system has
more than 2^31 allocations it can not be shown correctly and the
meters are useless.

In such cases follow net-snmp behaviour and increase
hrStorageAllocationUnits so the values fit under INT_MAX.

PR:		bin/177183
Submitted by:	Eugene Grosbein egrosbein rdtc.ru
MFC after:	2 weeks
Dtrace: Add SUN MDB-like type-aware print() action.

Merge change from illumos:

1694 Add type-aware print() action

This is a very nice feature implemented in upstream Dtrace.
A complete description is available here:
http://dtrace.org/blogs/eschrock/2011/10/26/your-mdb-fell-into-my-dtrace/

This change bumps the DT_VERS_* number to 1.9.0 in
accordance to what is done in illumos.

While here also include some minor cleanups to ease further merging
and appease clang with a fix by Fabian Keil.

Illumos Revisions:	13501:c3a7090dbc16
			13483:f413e6c5d297

Reference:
https://www.illumos.org/issues/1560
https://www.illumos.org/issues/1694

Tested by:	Fabian Keil
Obtained from:	Illumos
MFC after:	1 month
Do not pass unmapped buffers to drivers that cannot handle them

In physio, check if device can handle unmapped IO and pass an
appropriately mapped buffer to the driver strategy routine. The
only driver in the tree that can handle unmapped buffers is one
exposed by GEOM, so mark it as such with the new flag in the
driver cdevsw structure.

This fixes insta-panics on hosts, running dconschat, as /dev/fwmem
is an example of the driver that makes use of physio routine, but
bypasses the g_down thread, where the buffer gets mapped normally.

Discussed with: kib (earlier version)
Migrate the multicast queue assembly code to not use the axq_link pointer
and instead use the HAL method to set the link pointer.

Tested:

* AR9280, hostap mode, CABQ frames being queued and transmitted
Convert the EDMA multicast queue code over to use the HAL method to set
the descriptor link pointer, rather than directly.

This is needed on AR9380 and later (ie, EDMA) NICs so the multicast queue
has a chance in hell of being put together right.

Tested:

* AR9380, AR9580 in hostap mode, CABQ traffic (but with other patches..)
Convert the CABQ queue code over to use the HAL link pointer method
instead of axq_link.

This (among a bunch of uncommitted work) is required for EDMA chips
to correctly transmit frames on the CABQ.

Tested:

* AR9280, hostap mode
* AR9380/AR9580, hostap mode (staggered beacons)

TODO:

* This code only really gets called when burst beacons are used;
  it glues multiple CABQ queues together when sending to the hardware.
* More thorough bursted beacon testing! (first requires some work with
  the beacon queue code for bursted beacons, as that currently uses the
  link pointer and will fail on EDMA chips.)
Remove this dead code - it's no longer relevant (as yes, we do actually
support TX on EDMA chips.)
Remove the mcast path calls to ath_hal_gettxdesclinkptr() for axq_link -
they're no longer needed for the legacy path and they're not wanted
for the EDMA path.

Tested:

* AR9280, hostap + CABQ
* AR9380/AR9580, hostap + CABQ
Remove extra bio_data and bio_length copying to child request after calling
g_clone_bio(), that already copied them.
GEOM NOP does not touch the data, so pass G_PF_ACCEPT_UNMAPPED flag through.
geom_slice.c and its consumers like GEOM_LABEL are not touching the data
unless hotspots are used.  Pass G_PF_ACCEPT_UNMAPPED flag through except
such rare cases (obsolete GEOM_SUNLABEL and GEOM_BSD).
Cleanup: wrap long lines, cleanup comments, etc.
Return ENOMEM if malloc() fails.
Introduce vm_radix_isleaf() and use it in a couple places.  As compared to
using vm_radix_node_page() == NULL, the compiler is able to generate one
less conditional branch when vm_radix_isleaf() is used.  More use cases
involving the inner loops of vm_radix_insert(), vm_radix_lookup{,_ge,_le}(),
and vm_radix_remove() will follow.

Reviewed by:	attilio
Sponsored by:	EMC / Isilon Storage Division
Do not look at the namespace's thin provisioning field to determine if DSM
command is supported.  The two are not related.

Sponsored by:	Intel