e76c0108 mav Jan. 16, 2022, 12:32 a.m.
Before commit 3cec5c77d617 buf_daemon() went to longer 1s sleep if
numdirtybuffers <= lodirtybuffers.  After that commit new condition
!BIT_EMPTY(BUF_DOMAINS, &bdlodirty) got opposite -- true when one
or more more domains is above lodirtybuffers.  As result, on freshly
booted system with no dirty buffers buf_daemon() wakes up 10 times
per second and probably only 1 time per second when there is actual
work to do.

MFC after:	1 week
Reviewed by:	kib, markj
Tested by:	pho
Differential revision:	https://reviews.freebsd.org/D33890
10af8e45 se Jan. 15, 2022, 11:43 p.m.
A case of undefined behavior in __fread() has been detected by UBSAN
and reported by Mark Millard:

/usr/main-src/lib/libc/stdio/fread.c:133:10: runtime error: applying
zero offset to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior in

While being benign (the NULL pointer is later passed to memcpy() with
a length argument of 0), this issue causes in the order of 600 Kyua
test cases to fail on systems running a world built with WITH_UBSAN

The undefined behavior can be prevented by skipping operations that
have no effect for r == 0. Mark Millard has suggested to only skip
this code segment if fp->_p == NULL, but I have verified that for the
case of r == 0 no further argument checking is performed on the
addresses passed to memcpy() and thus no bugs are hidden from the
sanitizers due to the simpler condition chosen.

Reported by:	Mark Millard (marklmi@yahoo.com)
Tested by:	Mark Millard (marklmi@yahoo.com)
Differential Revision:	https://reviews.freebsd.org/D33903
MFC after:	2 weeks
c8dafefa bz Jan. 15, 2022, 10:22 p.m.
Correct data types related to delivery traffic indication map (DTIM)/
timing synchronization function (TSF) and implement/refine their
handling.  This information is used/needed by iwlwifi to set a station
as associated.  This will hopefully avoid more "no beacon heard"
time event failures.

The recording of the Linux specific sync_device_ts is done in the
receive path for now in case we do have the right information
available.  I need to investigate as to how-much it may make sense
to also migrate it into net80211 in the future depending on the
usage in other drivers (or how we did handle this in the past in
natively ported versions, e.g. iwm).

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
f3229b62 bz Jan. 15, 2022, 10:18 p.m.
Rather than just bouncing back to SCAN bounce to INIT on connection
loss.  This is should be refined in the future as the comment already
indicates but we need to tie two different worlds together.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
4e3a4390 jrtc27 Jan. 15, 2022, 7:03 p.m.
We do not include sys/rman.h and so machine/resource.h ends up not being
included by the time pci_private.h is included. This means PCI_RES_BUS
is never defined, and so the sc_bus member of pci_softc is not present
when compiling ofw_pci, resulting in the wrong softc size being passed
to DEFINE_CLASS_1 and thus any attempts by pci(4) to access that member
are out-of-bounds reads or writes.

This is pretty fragile; arguably pci_private.h should be including
sys/rman.h, but this is the minimal needed change to fix the bug whilst
maintaining the status quo.

Found by:	CHERI
Reported by:	andrew
3266a0c5 pho Jan. 15, 2022, 9:21 a.m.
de1292c6 cperciva Jan. 15, 2022, 1:30 a.m.
Some VM systems announce the frequency of the local APIC via the
CPUID leaf 0x40000010.  Using this allows us to boot slightly
faster by avoiding the need for timer calibration.

Reviewed by:	markj
Sponsored by:	https://www.patreon.com/cperciva
4a432614 cperciva Jan. 15, 2022, 1:30 a.m.
While this CPUID leaf was originally only used by VMWare, other
hypervisors now also use it to announce the TSC frequency to guests.

This speeds up the boot process by 100 ms in EC2 and other systems,
by allowing the early calibration DELAY to be skipped.

Reviewed by:	markj
Sponsored by:	https://www.patreon.com/cperciva
fd980feb cperciva Jan. 15, 2022, 1:30 a.m.
This allows us to set tsc_is_invariant and select appropriately
fenced versions of RDTSC based on the CPU type.

Reviewed by:	markj
Sponsored by:	https://www.patreon.com/cperciva
a727d953 np Jan. 15, 2022, 12:44 a.m.
The default sysctl context setup by newbus for a device is eventually
freed by device_sysctl_fini, which runs after the device driver's detach
routine.  sysctl nodes associated with this context must not use any
resources (like driver locks, hardware access, counters, etc.) that are
released by driver detach.

There are a lot of sysctl nodes like this in cxgbe(4) and the fix is to
hang them off a context that is explicitly freed by the driver before it
releases any resource that might be used by a sysctl.

This fixes panics when running "sysctl dev.t6nex dev.cc" in a tight loop
and loading/unloading the driver in parallel.

Reported by:	Suhas Lokesha
MFC after:	1 week
Sponsored by:	Chelsio Communications
301b2b02 emaste Jan. 15, 2022, 12:23 a.m.
Fixes:		ef790cc7407e ("hdaa: update pin patch configurations")
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D33900
4762aa57 imp Jan. 15, 2022, 12:21 a.m.
Since both scsi_xpt and ata_xpt use the same name for the softc, this
can lead to problems in gdb. Avoid the issue by renaming the ata
probe_softc to aprobe_softc as has been done for the aprobe in
0f280cbd0a3a9. This was overlooked at the time.

Sponsored by:		Netflix
MFC After:		2 weeks
bacb140f sjg Jan. 15, 2022, 12:07 a.m.
VM's have little control over CPU speed, don't make matters worse
by constantly spaming console.

Reviewed by:	jhb
Differential Revision:	https://reviews.freebsd.org/D33902
a9a2cdaf mav Jan. 14, 2022, 11:24 p.m.
Before this change on every open da(4) driver read all mode pages to
use only one bit.  It was done so to not depend on the list of pages
supported by the disk.  But I've found that at least for SATL of LSI/
Broadcom HBAs with WD HDDs Power Condition mode page reading may take
significant amount of time, much more than any other mode page, that
visibly increased disk retaste time by GEOM.

Address that by using data returned by the first MODE SENSE request
to limit the following ones to only one (the first for now) mode page.

With the change simultaneous retaste of 39 SATA disks takes about 2.5s
instead of more than 4s before, and I no longer see "dareprobe" status
on GEOM event thread.

MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.
d7f944a0 vangyzen Jan. 14, 2022, 4:19 p.m.
Allow projects based on the FreeBSD tree to append to _PRIVATELIBS
and _INTERNALLIBS by simply maintaining their own lists of

Reviewed by:	bdrewery
MFC after:	1 week
Sponsored by:	Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D33901