r366106 andrew Sept. 24, 2020, 7:17 a.m.
We need to use a bounce buffer when the memory we are operating on is not
aligned to a cacheline, and not aligned to the maps alignment.

The former is to stop other threads from dirtying the cacheline while we
are performing DMA operations with it. The latter is to check memory
passed in by a driver is correctly aligned for the device.

Reviewed by:	mmel
Sponsored by:	Innovate UK
Differential Revision:	https://reviews.freebsd.org/D26496
r366105 andrew Sept. 24, 2020, 7:13 a.m.
This will ensure nothing modifies the cacheline while DMA is in progress
so we won't need to bounce the data.

Reviewed by:	mmel
Sponsored by:	Innovate UK
Differential Revision:	https://reviews.freebsd.org/D26495
r366104 imp Sept. 24, 2020, 7:10 a.m.
_STANDALONE is only for the bootloader, not kernel modules. Remove it
from the build. This was harmless before, but sys/malloc.h now does
different things for the standalone environment, triggering the issue.
r366103 andrew Sept. 24, 2020, 7:07 a.m.
Use it to decide if we can skip cache management.

While here remove the DMAMAP_COULD_BOUNCE flag as it's unneeded.

Reviewed by:	mmel
Sponsored by:	Innovate UK
Differential Revision:	https://reviews.freebsd.org/D26494
r366102 andrew Sept. 24, 2020, 7:03 a.m.
Add helper functions to the arm64 busdma for common cases of checking if
we may need to bounce, and if we must bounce for a given address.

These will be expanded later as we handle cache-misaligned memory.

Reported by:	mmel
Sponsored by:	Innovate UK
Differential Revision:	https://reviews.freebsd.org/D26493
r366101 imp Sept. 24, 2020, 6:40 a.m.
The ZSTD support for the boot loader will need to include files that
use the kernel's malloc interface. Create a standalone stub version
that's functional enough to allow this to work. There's some
limitations in this interface, and it's not quite a perfect
match. Specifically, M_WAITOK allocations can fail because there's
nothing that can be done we no memory is available.
r366100 se Sept. 24, 2020, 6:12 a.m.
MFC after:	3 days
r366099 mjg Sept. 24, 2020, 3:38 a.m.
It is only ever called for negative entries and for those it is
just a wrapper around cache_zap_negative_locked_vnode_kl which
always succeeds.

This also fixes a bug where cache_lookup_fallback should have been
calling cache_zap_locked_bucket instead. Note that in order to trigger
the bug NOCACHE must not be set, which currently only happens when
creating a new coredump (and then the coredump-to-be has to have a
negative entry).
r366098 sobomax Sept. 24, 2020, 2:44 a.m.

The default system log rotation mechanism (newsyslog(8)) requires ability to send
signal to a daemon in order to properly complete rotation of the logs in an "atomic"
manner without having to making a copy and truncating original file. Unfortunately
our built-in mechanism to convert "dumb" programs into daemons has no way to handle
this rotation properly. This change adds this ability, to be enabled by supplying -H
option in addition to the -o option.

Reviewed by:	markj, rpokala (manpages)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D26526
r366096 imp Sept. 23, 2020, 10:49 p.m.
I snagged the license boiler plate. Fix that. also, it's spelled .Va
not .Vn. Plus " quoting issues.

Noticed by: rgrimes, xtouqh at hotmail dot com
r366093 kevans Sept. 23, 2020, 7:54 p.m.
memfd_create is implemented on top of posixshm, so this is a logically
correct place for them to be. Moreover, this reduces the number of places to
look to run tests when working in this part of the tree.

Discussed with:	kib (to some extent, a while ago)
r366091 markj Sept. 23, 2020, 7:36 p.m.
Nothing in these subsystems relies on Giant.

MFC after:	1 week
r366090 markj Sept. 23, 2020, 7:34 p.m.
Enable SHM_LARGEPAGE support on arm64.

Reviewed by:	alc, kib
Sponsored by:	Juniper Networks, Inc., Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D26467
r366089 markj Sept. 23, 2020, 7:33 p.m.
Reviewed by:	alc, kib
Sponsored by:	Juniper Networks, Inc., Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D26466
r366088 imp Sept. 23, 2020, 7:18 p.m.
The NOTES files have a bunch of hint lines that are removed when
generating LINT. However, we can achieve the same effect by prepending
each of the lines with 'envvar' so the NOTES files become standard
config(8) files. No functional changes as the sed script to generate
the LINT files filters these either way.

Suggested by: kevans