Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFC r249468:
Stop abusing xpt_periph in random plases that really have no periph related
to CCB, for example, bus scanning. NULL value is fine in such cases and it
is correctly logged in debug messages as "noperiph". If at some point we
need some real XPT periphs (alike to pmpX now), quite likely they will be
per-bus, and not a single global instance as xpt_periph now.

MFC r248825, 248775

Add unmapped i/o support for the mps and isci drivers.

Submitted by: mav, jimharris
Obtained from: Netflix

MFC r239545, r239665:

Fix/add support for SCSI UNMAP to ATA DSM translation.

This addresses kernel panic observed when sending SCSI UNMAP
commands to SATA disks attached to isci(4).

1) Flesh out callback routines to allocate/free buffers needed for
translating SCSI UNMAP data to ATA DSM data.
2) Add controller-level pool for storing buffers previously allocated
for UNMAP translation, to lessen chance of no buffer available
under memory pressure.
3) Ensure driver properly handles case where buffer pool is empty
and contigmalloc returns NULL.
4) Clear freeze bit in isci_remote_device_release_lun_queue() before
calling xpt_release_devq to ensure that any ccbs which immediately
start during the call to xpt_release_devq() see an accurate picture
of the frozen_lun_mask. This code path is extensively exercised
when tagged read/write commands mix with non-tagged DSM commands.

Sponsored by: Intel

MFC r234106, r235751:

Queue CCBs internally instead of using CAM_REQUEUE_REQ status. This fixes
problem where userspace apps such as smartctl fail due to CAM_REQUEUE_REQ
status getting returned when tagged commands are outstanding when smartctl
sends its I/O using the pass(4) interface.

Sponsored by: Intel

MFC r233622:

Ensure consistent target IDs for direct-attached devices.

Sponsored by: Intel
Reported by: sbruno, Ravi Pokala <rpokala at panasas dot com>
Tested by: Ravi Pokala <rpokala at panasas dot com>
Approved by: sbruno

MFC r233371:

Call xpt_bus_register during attach context, then freeze and do not release
until domain discovery is complete. This fixes an isci(4) bug on FreeBSD 7.x
where devices weren't always appearing after boot without an explicit rescan.

Sponsored by: Intel
Reported and tested by: <rpokala at panasas dot com>
Reviewed by: scottl
Approved by: scottl

MFC r231860

During work to port isci(4) to stable/7 I noted that the maxio portion of
struct ccb_pathinq from sys/cam/cam_ccb.h wasn't added to stable/7 at all
and didn't appear in stable/8 until svn R195534. Since __FreeBSD_version
did not get bumped until svn R195634, assume that maxio is valid at 800102
or higher.

Obtained from: Yahoo! Inc.

MFC r230843, r231134, r231136, r231137, r231296

Add isci(4) driver for amd64 and i386 targets.

The isci driver is for the integrated SAS controller in the Intel C600
(Patsburg) chipset. Source files in sys/dev/isci directory are
FreeBSD-specific, and sys/dev/isci/scil subdirectory contains
an OS-agnostic library (SCIL) published by Intel to control the SAS
controller. This library is used primarily as-is in this driver, with
some post-processing to better integrate into the kernel build
environment.

isci.4 and a README in the sys/dev/isci directory contain a few
additional details.

This driver is only built for amd64 and i386 targets.

Sponsored by: Intel
Reviewed by: scottl
Approved by: scottl

Add isci(4) driver for amd64 and i386 targets.

The isci driver is for the integrated SAS controller in the Intel C600
(Patsburg) chipset. Source files in sys/dev/isci directory are
FreeBSD-specific, and sys/dev/isci/scil subdirectory contains
an OS-agnostic library (SCIL) published by Intel to control the SAS
controller. This library is used primarily as-is in this driver, with
some post-processing to better integrate into the kernel build
environment.

isci.4 and a README in the sys/dev/isci directory contain a few
additional details.

This driver is only built for amd64 and i386 targets.

Sponsored by: Intel
Reviewed by: scottl
Approved by: scottl

Add all isci driver source code to sys/dev/isci for the Intel C600
(Patsburg) integrated SAS controller.

sys/dev/isci contains all files specific to FreeBSD.
sys/dev/isci/scil contains OS-agnostic library maintained by Intel and
modified to best integrate into FreeBSD kernel build environment.

Sponsored by: Intel
Reviewed by: scottl