This is a lock-based emulation of 64-bit atomics for kernel use, split off
from an earlier patch by jhibbits.
This is needed to unblock future improvements that reduce the need for
locking on 64-bit platforms by using atomic updates.
The implementation allows for future integration with userland atomic64,
but as that implies going through sysarch for every use, the current
status quo of userland doing its own locking may be for the best.
Submitted by: jhibbits (original patch), kevans (mips bits)
Reviewed by: jhibbits, jeff, kevans
Differential Revision: https://reviews.freebsd.org/D22976
The fdt attachment for this heavily relies on extres for clk work. This
unbreaks the build for mips XLPN32/XLP, which have pci/fdt but no need for
this fdt attachment.
This will soon be a dependency for machine/atomic.h on mips with the
introduction of 64-bit atomics; the scope here is pretty narrow, so throw it
here in the header just before systm.h, which includes machine/atomic.h
and make it usable outside of kern_umtx.c. To be used in several
future changes.
Discussed with: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Its use of the page lock is incorrect, and it is not used by the DRM
modules.
Reviewed by: hselasky
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D23002
The page daemon loops may move pages back to the active queue if
references are detected. In this case we must take care to clear
existing queue operation flags. In particular, PGA_REQUEUE_HEAD may be
set, and that flag is only valid if the page belongs to the inactive
queue.
Also fix a bug in the active queue scan where we were updating "old"
instead of "new". This would only have been hit in rare cases where the
page moved out of the active queue after the beginning of the scan.
Reported by: Bob Prohaska, Idwer Vollering
Tested by: Idwer Vollering
Reviewed by: alc, kib
Differential Revision: https://reviews.freebsd.org/D23001
An i2c bus can be divided into segments which can be selectively connected
and disconnected from the main bus. This is usually done to enable using
multiple slave devices having the same address, by isolating the devices
onto separate bus segments, only one of which is connected to the main bus
at once.
There are several types of i2c bus muxes, which break down into two general
categories...
- Muxes which are themselves i2c slaves. These devices respond to i2c
commands on their upstream bus, and based on those commands, connect
various downstream buses to the upstream. In newbus terms, they are both
a child of an iicbus and the parent of one or more iicbus instances.
- Muxes which are not i2c devices themselves. Such devices are part of the
i2c bus electrically, but in newbus terms their parent is some other
bus. The association with the upstream bus must be established by
separate metadata (such as FDT data).
In both cases, the mux driver has one or more iicbus child instances
representing the downstream buses. The mux driver implements the iicbus_if
interface, as if it were an iichb host bridge/i2c controller driver. It
services the IO requests sent to it by forwarding them to the iicbus
instance representing the upstream bus, after electrically connecting the
upstream bus to the downstream bus that hosts the i2c slave device which
made the IO request.
The net effect is automatic mux switching which is transparent to slaves on
the downstream buses. They just do i2c IO they way they normally do, and the
bus is electrically connected for the duration of the IO and then idled when
it is complete.
The existing iicbus_if callback() method is enhanced so that the parameter
passed to it can be a struct which contains a device_t for the requesting
bus and slave devices. This change is done by adding a flag that indicates
the extra values are present, and making the flags field the first field of
a new args struct. If the flag is set, the iichb or mux driver can recast
the pointer-to-flags into a pointer-to-struct and access the extra
fields. Thus abi compatibility with older drivers is retained (but a mux
cannot exist on the bus with the older iicbus driver in use.)
A new set of core support routines exists in iicbus.c. This code will help
implement mux drivers for any type of mux hardware by supplying all the
boilerplate code that forwards IO requests upstream. It also has code for
parsing metadata and instantiating the child iicbus instances based on it.
Two new hardware mux drivers are added. The ltc430x driver supports the
LTC4305/4306 mux chips which are controlled via i2c commands. The
iic_gpiomux driver supports any mux hardware which is controlled by
manipulating the state of one or more gpio pins. Test Plan
Tested locally using a variety of mux'd bus configurations involving both
ltc4305 and a homebrew gpio-controlled mux. Tested configurations included
cascaded muxes (unlikely in the real world, but useful to prove that 'it all
just works' in terms of the automatic switching and upstream forwarding of
IO requests).
This is needed when the driver is compiled into the kernel.
When compiled as a module this will be called from another
code path as we also depend on ofw_spibus.
MFC after: 1 week
SCTP_PEER_ADDR_PARAMS socket option. The code in the stack assumes
sane values for the MTU.
This issue was found by running an instance of syzkaller.
MFC after: 1 week
TARGET=arm now defaults to TARGET_ARCH=armv7
TARGET_ARCH=arm is no longer valid.
Bump __FreeBSD_version to 1300073
Tested with make universe. Any stale LINT-V5 config files remaining in the tree
will fail the universe build. However, LINT-V5 was removed in r355119.
This retirement has been planned since last summer. The armv5 port is fragile:
it works OK for some peeople, and fails badly for others. There's a number of
subtle bugs in busdma, pmap and other MD parts of thee system that present
themselves under load or in unusual circumstances (like fsck after a
crash). stable/8, branched 10 years ago, was the last reliable release. Since
the support burden is larger then the benefit, the consensus view is armv5
should be removed from the tree.
Discussed with: arm@ mailing list and arm developer community.
r23081 introduced kern.dummy oid as a semi ABI compat for kern.maxsockbuf
that was moved to a new namespace. It never functioned as an alias of any
kind and was just returning 0 unconditionally, hence it was probably
provided to keep some 3rd party programmes happy about sysctl(3) not
reporting an error because of non-existing oid.
After nearly 23 years it seems reasonable to just hide it from sysctl(8)
list not to cause unnecessary confusion as for its purpose.
Reported by: Antranig Vartanian <antranigv@freebsd.am>
Reviewed by: kib (mentor)
Approved by: kib (mentor)
Differential Revision: https://reviews.freebsd.org/D22982
The number is public and has no "entropy," but should be integrated quickly
on VM rewind events to avoid duplicate sequences.
Approved by: csprng(markm)
Differential Revision: https://reviews.freebsd.org/D22946
entry in the vm_map, making invariants related to the max_free entry
field invalid. Move the clipping work into vm_map_entry_link, so that
linking is okay when the new entry clips a current entry, and the
vm_map doesn't have to be briefly corrupted. Change assertions and
conditions in SPLAY_{LEFT,RIGHT}_STEP since the max_free invariants
can now be trusted in all cases.
Tested by: pho
Reviewed by: alc
Differential Revision: https://reviews.freebsd.org/D22897
syscall is to query the CPU number and the NUMA domain the calling
thread is currently running on. The third argument is ignored.
It doesn't do anything regarding scheduling - it's literally
just a way to query the current state, without any guarantees
you won't get rescheduled an opcode later.
This unbreaks Java from CentOS 8
(java-11-openjdk-11.0.5.10-0.el8_0.x86_64).
Reviewed by: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22972
This fixes deadlock between CARP and bridge. Bridge calls this function
taking CARP lock while holding bridge lock. Same time CARP tries to send
its announcements via the bridge while holding CARP lock.
Use of CARP_LOCK() here does not solve anything, since sc_addr is constant
while race on sc_state is harmless and use of the lock does not close it.
Reviewed by: glebius
MFC after: 2 weeks
Sponsored by: iXsystems, Inc.
Amount of changes to the original code has been intentionally minimised
to ease diffing.
The changes are mostly mechanical, with the following exceptions:
* lltable handler is now called directly based of RTF_LLINFO flag presense.
* "report" logic for updating rtm in RTM_GET/RTM_DELETE has been simplified,
fixing several potential use-after-free cases in rt_addrinfo.
* llable asserts has been replaced with error-returning, preventing kernel
crashes when lltable gw af family is invalid (root required).
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D22864
in the case where a packet not marked was received.
Submitted by: Richard Scheffenegger
Reviewed by: rgrimes@, tuexen@
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D19143
Implement support for the UART as found on the SiFive FU540. It should
also work on, but has not been tested with, the FU310.
Reviewed by: philip
Sponsored by: Axiado
There's no point in checking for absent CPUs if we're not going to do anything
about either the present or absent case. This loop can just be removed.
Reviewed by: philip
Sponsored by: Axiado
If somebody else holds that lock, it will likely do the work for us.
If it won't, then we return here later and retry.
Under heavy load it allows to avoid lock congestion between interrupt and
polling threads.
MFC after: 1 week
Sponsored by: iXsystems, Inc.
This brings arm into line with how every other arch does it. For some
reason, only arm lacked a definition of a symbol named kernbase in its
locore.S file(s) for use in its ldscript.arm file. Needlessly different
means harder to maintain.
Using a common symbol name also eases work in progress on a script to help
generate arm and arm64 kernels packaged in various ways (like with a header
blob needed for a bootloader prepended to the kernel file).
The code in sys/nfs/nfs_lock.c has not been run by default since March 2008
when it was replaced by the in kernel sys/nlm code.
It uses Giant, so it needs to be removed before the FreeBSD 13 release.
This will happen in a couple of months, since few if any users run
the code anyhow and can easily switch to the default in kernel NFSLOCKD.
