FreeBSD_HEAD_i386 - Build #3186 - Fixed

FreeBSD_HEAD_i386 - Build #3186 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3186/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3186/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3186/console

Change summaries:

300548 by adrian:
[bhnd] Implement pass-through resource management for ChipCommon.

This patchset adds support to bhnd_chipc for sharing SYS_RES_MEMORY
resources with its children, allowing us to hang devices off of
bhnd_chipc that rely on access to a subset of the device register space
that bhnd_chipc itself must also allocate.

We could avoid most of this heavy lifting if RF_SHAREABLE+SYS_RES_MEMORY
wasn't limited to use with allocations at the same size/offset.

As a work-around, I implemented something similar to vga_pci.c, which
implements similar reference counting of of PCI BAR resources for its
children.

With these changes, chipc will use reference counting of SYS_RES_MEMORY
allocation/activation requests, to decide when to allocate/activate/
deactivate/release resources from the parent bhnd(4) bus.

The requesting child device is allocated a new resource from chipc's
rman, pointing to (possibly a subregion of) the refcounted bhnd resources
allocated by chipc.

Other resource types are just passed directly to the parent bhnd bus;
RF_SHAREABLE works just fine with IRQs.

I also lifted the SPROM device code out into a common driver, since this
now allows me to hang simple subclasses off of a common driver off of both
bhndb_pci and bhnd_chipc.

Tested:

* (landonf) Tested against BCM4331 and BCM4312, confirmed that SPROM still
  attaches and can be queried.

Submitted by:	Landon Fuller <landonf_at_landonf.org>
Reviewed by:	mizkha_at_gmail.com
Differential Revision:	https://reviews.freebsd.org/D6471

300547 by truckman:
Fix multiple Coverity Out-of-bounds access false postive issues in CAM

The currently used idiom for clearing the part of a ccb after its
header generates one or two Coverity errors for each time it is
used.  All instances generate an Out-of-bounds access (ARRAY_VS_SINGLETON)
error because of the treatment of the header as a two element array,
with a pointer to the non-existent second element being passed as
the starting address to bzero().  Some instances also alsp generate
Out-of-bounds access (OVERRUN) errors, probably because the space
being cleared is larger than the sizeofstruct ccb_hdr).

In addition, this idiom is difficult for humans to understand and
it is error prone.  The user has to chose the proper struct ccb_*
type (which does not appear in the surrounding code) for the sizeof()
in the length calculation.  I found several instances where the
length was incorrect, which could cause either an actual out of
bounds write, or incompletely clear the ccb.

A better way is to write the code to clear the ccb itself starting
at sizeof(ccb_hdr) bytes from the start of the ccb, and calculate
the length based on the specific type of struct ccb_* being cleared
as specified by the union ccb member being used.  The latter can
normally be seen in the nearby code.  This is friendlier for Coverity
and other static analysis tools because they will see that the
intent is to clear the trailing part of the ccb.

Wrap all of the boilerplate code in a convenient macro that only
requires a pointer to the desired union ccb member (or a pointer
to the union ccb itself) as an argument.

Reported by:	Coverity
CID:		1007578, 1008684, 1009724, 1009773, 1011304, 1011306
CID:		1011307, 1011308, 1011309, 1011310, 1011311, 1011312
CID:		1011313, 1011314, 1011315, 1011316, 1011317, 1011318
CID:		1011319, 1011320, 1011321, 1011322, 1011324, 1011325
CID:		1011326, 1011327, 1011328, 1011329, 1011330, 1011374
CID:		1011390, 1011391, 1011392, 1011393, 1011394, 1011395
CID:		1011396, 1011397, 1011398, 1011399, 1011400, 1011401
CID:		1011402, 1011403, 1011404, 1011405, 1011406, 1011408
CID:		1011409, 1011410, 1011411, 1011412, 1011413, 1011414
CID:		1017461, 1018387, 1086860, 1086874, 1194257, 1229897
CID:		1229968, 1306229, 1306234, 1331282, 1331283, 1331294
CID:		1331295, 1331535, 1331536, 1331539, 1331540, 1341623
CID:		1341624, 1341637, 1341638, 1355264, 1355324
Reviewed by:	scottl, ken, delphij, imp
MFH:		1 month
Differential Revision:	https://reviews.freebsd.org/D6496

300546 by allanjude:
Only set kern.geom.part.mbr.enforce_chs=0 once, instead of once per disk

Sponsored by:	ScaleEngine Inc.

300545 by allanjude:
Add support for RAID 1+0 (striped mirrors) to bsdinstall/zfsboot

Sponsored by:	ScaleEngine Inc.

300544 by asomers:
Fix build of kern/subr_unit.c, broken by r300539

Reported by:	peter
Pointyhat to:	asomers
Sponsored by:	Spectra Logic Corp