MFC r326276:

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

MFC r324978: Report only the valid slots in the firmware log page.

Printing the entire log page is causing confusion over available
slots. Report only those slots that are valid. In the case where the
firmware download isn't supported, assume that only the first slot is
valid (I have no hardware to test this assumption though)

MFC r324977 (by imp):
Add nvme_controller_data argument to all print functions.

It's desirable to access controler data to inform printing log pages
(such as limiting the printing to valid ranges).

MFC r320423 (by imp):
Move 128-bit integer routines to util.c so they can be used by more
than just the log page code.

MFC r314230 (by imp):
Make nvmecontrol logpage -p help list known pages.

Make -p help and -v help list all the pages we know about.
Add -v to usage.
Update the man page.

MFC r314228 (by imp): Fix typos in output.

MFC r313258 (by imp):
Add the ability to dump log pages directly in binary to stdout.
Update man page to include this flag, and an example of dumping a
vendor-specific page while I'm here.

MFC r313257 (by imp):
Add some descriptions to the man page for the supported log pages as
well as the new wdc commands. Make wdc be an alias for hgst when
specifying the vendor to use to interpret the page.

MFC r309777 (by imp):
Implement Intel's log page 0xc1 (Read Command Latency Log) and page
0xc1 (Write Command Latency Log).

MFC r309684 (by imp): Fix Typo

MFC r309413 (by imp):
Flag the vendor specific pages as such. This allows different decoding
for the same page number as different vendors encode vendor specific
pages differently.

MFC r308869 (by imp):
i386 turns out to not have __uint128_t. So confusingly use 64-bit math
instead. Since we're little endian, we can get away with it. Also,
since the counters in quesitons would require billions of iops for
tens of billions of seconds to overflow, and since such data rates are
unlikely for people using i386 for a while, that's OK. The fastest
cards today can't do even a million IOPs.

MFC r308856 (by imp):
Decode the Intel-specific Additional SMART data page (0xca) and print
it in human readable form. Include a pointer to the public spec that
was followed to implement this in the code. Samsung also implements
page 0xca on some of their drives, but the format is slighly
different, so the code skips printing zero keys. Samsung's log page
has additional, unknown data after the end of Intel defined data which
isn't displayed.

MFC r308848 (by imp):
Remove check for valid log pages. Let the drive tell us which pages
are valid or not. While many pages are reserved in the standard, that
doesn't make them invalid and future versions of the standard may
define then.

MFC r308855 (by imp):
Implement HGST Log page 0xc1, as documented in the HGST SN100 and
SN150 product manuals. Subpage 0x32 is documented, but not implemented.

MFC r308854 (by imp): Print Intel's expanded Temperature log page.

MFC r308849 (by imp):
Use a table for pages we know the size of. We have a special case for
the error log since it isn't a fixed size.

MFC r308851 (by imp):
Expand the SMART / Health Information Log Page (Page 02) printout
based on NVM Express 1.2.1 Standard.

MFC r308850 (by imp):
Print numbers instead of hex values for smart data. The full 128-bit
number is printed, even though you'd need like a billion IOPs for a 10
billion seconds to overflow the 64-bit counters (~300 years).

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

nvmecontrol: read controller identify data before any log page operations

MFC after: 3 days
Sponsored by: Intel

Send per-namespace logpage commands to the controller devnode, so they
are processed as admin commands, not I/O commands.

As part of this change, pull out the code for parsing a namespace node
string into a separate function, since it is used for both identify and
logpage commands.

Sponsored by: Intel
MFC after: 3 days

Incorporate feedback from bde@ based on r252672 changes:

* Use 0/1 instead of sysexits. Man pages are confusing on this topic,
but 0/1 is sufficient for nvmecontrol.
* Use err function family where possible instead of fprintf/exit.
* Fix some typing errors.
* Clean up some error message inconsistencies.

Sponsored by: Intel
Submitted by: bde (parts of firmware.c changes)
MFC after: 3 days

Fix build.

Add log page support to nvmecontrol(8) through a new logpage command.

This includes pretty printers for all of the standard NVMe log pages
(Error, SMART/Health, Firmware), as well as hex output for non-standard
or vendor-specific log pages.

Submitted by: Joe Golio <joseph.golio@emc.com>
Obtained from: EMC / Isilon Storage Division
MFC after: 3 days