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 r263276:

Base the max number of SG elements on MAXPHYS.

MFC r263275:

isci: Ensure ATA passthrough commands with RETURN_RESPONSE bit set
translate their response.

MFC r256231:

Improve logging around some of the isci(4) reset and recovery paths.

Sponsored by: Intel

MFC r256125:
Make isci(4) loadable.

MFC r250460 (by eadler):
Fix a bunch of typos.

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 r252262:

For ATA_PASSTHROUGH commands, pretend isci(4) supports multiword DMA
by treating it as UDMA.

This fixes a problem introduced in r249933/r249939, where CAM sends
ATA_DSM_TRIM to SATA devices using ATA_PASSTHROUGH_16. scsi_ata_trim()
sets protocol as DMA (not UDMA) which is for multi-word DMA, even
though no such mode is selected for the device. isci(4) would fail
these commands which is the correct behavior but not consistent with
other HBAs, namely LSI's.

smh@ did some further testing on an LSI controller, which rejected
ATA_PASSTHROUGH_16 commands with mode=UDMA_OUT, even though only
a UDMA mode was selected on the device. So this precludes adding
any kind of mode detection in CAM to determine which mode to use on
a per-device basis.

Sponsored by: Intel

MFC r248825, 248775

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

Submitted by: mav, jimharris
Obtained from: Netflix

Big MFC of the physbio changes necessary for unmapped I/O. These changes
have been in production at Netflix for several months with significant
success.

MFC r246713:

Reform the busdma API so that new types may be added without modifying
every architecture's busdma_machdep.c. It is done by unifying the
bus_dmamap_load_buffer() routines so that they may be called from MI
code. The MD busdma is then given a chance to do any final processing
in the complete() callback.

MFC r249538:
Some compilers issue a warning when wider integer is casted to narrow
pointer. Supposedly shut down the warning by casting through
uintptr_t.

MFC r251479:
Simplify the checking of flags for cam_periph_mapmem(). This gets rid of
a lot of code redundancy and grossness at very minor expense.

MFC r251837:
MFC r251842:
Add infrastructure for doing compatibility shims, as has been sorely
needed for the last 10 years. Far too much of the internal API is
exposed, and every small adjustment causes applications to stop working.
To kick this off, bump the API version to 0x17 as should have been done
with r246713, but add shims to compensate. Thanks to the shims, there
should be no visible change in application behavior.

Submitted by: kib, jeffr
Approved by: kib
Obtained from: Netflix

MFC r243904:

Don't call bus_dmamap_load in CAM_DIR_NONE case, since there is nothing
to map, and technically this isn't allowed.

Functionally, it works OK (at least on x86) to call bus_dmamap_load with
a NULL data pointer and zero length, so this is primarily for correctness
and consistency with other drivers.

While here, remove check in isci_io_request_construct for nseg==0.
Previously, bus_dmamap_load would pass nseg==1, even for case where
buffer is NULL and length = 0, which allowed CAM_DIR_NONE CCBs
to get processed. This check is not correct though, and needed to be
removed both for the changes elsewhere in this patch, as well as jeff's
preliminary bus_dmamap_load_ccb patch (which uncovered all of this in
the first place).

MFC r240743 and r234418:
Fix some typos.

MFC r240514:

isci(4): Fix SCSI/ATA translation for SCSI_WRITE_BUFFER w/ mode==0x7
(download microcode with offsets, save, and activate).

SATI translation layer was incorrectly using allocation length instead
of blocks, and was constructing the ATA command incorrectly.

Also change #define to specify that the 512 block size here is
specific for DOWNLOAD_MICROCODE, and does not relate to the device's
logical block size.

MFC r240520:
s/teh/the/g

Approved by: cperciva (implicit)

MFC r240518:
Correct double "the the"

Approved by: cperciva (implicit)

MFC r240521:

s/ is is / is /g
s/ a a / a /g

Approved by: cperciva (implicit)

MFC r239889:

Do not call sati_check_data_io() for SATI_UNMAP sequences.

This routine is intended only for commands such as INQUIRY where
the controller may fill out a smaller amount of data than allocated
by the host.

The end result of this bug was that isci(4) would report non-zero
resid for successful SCSI_UNMAP commands.

Sponsored by: Intel

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

Toss bogus mergeinfo.

MFC r235634

Fix and update battery status bits according to linux driver

MFC r235043:

Fix off-by-one error in sati_inquiry_block_device_translate_data(). Bug would
result in INQUIRY VPD 0x81 to SATA devices to return only 63 bytes of data
instead of 64 during SCSI/ATA translation.

Sponsored by: Intel

MFC r233710:

Fix the following compilation warning with clang trunk in isci(4):

sys/dev/isci/isci_task_request.c:198:7: error: case value not in enumerated type 'SCI_TASK_STATUS' (aka 'enum _SCI_TASK_STATUS') [-Werror,-Wswitch]
case SCI_FAILURE_TIMEOUT:
^

This is because the switch is done on a SCI_TASK_STATUS enum type, but
the SCI_FAILURE_TIMEOUT value belongs to SCI_STATUS instead.

Because the list of SCI_TASK_STATUS values cannot be modified at this
time, use the simplest way to get rid of this warning, which is to cast
the switch argument to int. No functional change.

Reviewed by: jimharris

MFC r233663:

Fix bug where isci(4) would report only 15 bytes of returned data on a
READ_CAP_16 command to a SATA target.

Sponsored by: Intel
Approved by: sbruno

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 r232225

Update PCI-IDs with devices found on Intel SDP

Return BUS_PROBE_DEFAULT so that non-default drivers may be loaded

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

Fix ATAPI code path to ensure bus_dma_segment structures are only used
within bus_dmamap_load context.

Sponsored by: Intel
Reported by: Sohaib Ahsan <sohaib dot ahsan intel com>

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

Modify GENERIC, files and options for isci (Intel C600 SAS controller) driver.
Also add brief README and cleanup Makefile.

Reviewed by: scottl sbruno