Sync up with the following changes from FreeBSD:
ZFS: add emulation of atomic_swap_64 and atomic_load_64
Some 32-bit platforms do not provide 64-bit atomic operations that ZFS
requires, either in userland or at all. We emulate those operations
for those platforms using a mutex. That is not entirely correct and
it's very efficient. Besides, the loads are plain loads, so torn
values are possible.
Nevertheless, the emulation seems to work for some definition of work.
This change adds atomic_swap_64, which is already used in ZFS code,
and atomic_load_64 that can be used to prevent torn reads.
Authored by: avg <avg@FreeBSD.org>
FreeBSD-commit: freebsd/freebsd@3458e5d1e6
cleanup of illumos compatibility atomics
atomic_cas_32 is implemented using atomic_fcmpset_32 on all platforms.
Ditto for atomic_cas_64 and atomic_fcmpset_64 on platforms that have
it. The only exception is sparc64 that provides MD atomic_cas_32 and
atomic_cas_64.
This is slightly inefficient as fcmpset reports whether the operation
updated the target and that information is not needed for cas.
Nevertheless, there is less code to maintain and to add for new
platforms. Also, the operations are done inline now as opposed to
function calls before.
atomic_add_64_nv is implemented using atomic_fetchadd_64 on platforms
that provide it.
casptr, cas32, atomic_or_8, atomic_or_8_nv are completely removed as
they have no users.
atomic_mtx that is used to emulate 64-bit atomics on platforms that
lack them is defined only on those platforms.
As a result, platform specific opensolaris_atomic.S files have lost
most of their code. The only exception is i386 where the
compat+contrib code provides 64-bit atomics for userland use. That
code assumes availability of cmpxchg8b instruction. FreeBSD does not
have that assumption for i386 userland and does not provide 64-bit
atomics. Hopefully, this can and will be fixed.
Authored by: avg <avg@FreeBSD.org>
FreeBSD-commit: freebsd/freebsd@e9642c209b
emulate illumos membar_producer with atomic_thread_fence_rel
membar_producer is supposed to be a store-store barrier.
Also, in the code that FreeBSD has ported from illumos membar_producer
is used only with regular stores to regular memory (with respect to
caching).
We do not have an MI primitive for the store-store barrier, so
atomic_thread_fence_rel is the closest we have as it provides
(load | store) -> store barrier.
Previously, membar_producer was an empty function call on all 32-bit
arm-s, 32-bit powerpc, riscv and all mips variants. I think that it
was inadequate.
On other platforms, such as amd64, arm64, i386, powerpc64, sparc64,
membar_producer was implemented using stronger primitives than required
for a store-store barrier with respect to regular memory access.
For example, it used sfence on amd64 and lock-ed nop in i386 (despite
TSO).
On powerpc64 we now use recommended lwsync instead of eieio.
On sparc64 FreeBSD uses TSO mode.
On arm64/aarch64 we now use dmb sy instead of dmb ish. Not sure if
this is an improvement, actually.
After this change we can drop opensolaris_atomic.S for aarch64, amd64,
powerpc64 and sparc64 as all required atomic operations have either
direct or light-weight mapping to FreeBSD native atomic operations.
Discussed with: kib
Authored by: avg <avg@FreeBSD.org>
FreeBSD-commit: freebsd/freebsd@50cdda62fc
fix up r353340, don't assume that fcmpset has strong semantics
fcmpset can have two kinds of semantics, weak and strong.
For practical purposes, strong semantics means that if fcmpset fails
then the reported current value is always different from the expected
value. Weak semantics means that the reported current value may be the
same as the expected value even though fcmpset failed. That's a so
called "sporadic" failure.
I originally implemented atomic_cas expecting strong semantics, but
many platforms actually have weak one.
Reported by: pkubaj (not confirmed if same issue)
Discussed with: kib, mjg
Authored by: avg <avg@FreeBSD.org>
FreeBSD-commit: freebsd/freebsd@238787c74e
[PowerPC] [MIPS] Implement 32-bit kernel emulation of atomic64 operations
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
Authored by: bdragon <bdragon@FreeBSD.org>
Differential Revision: https://reviews.freebsd.org/D22976
FreeBSD-commit: freebsd/freebsd@db39dab3a8
Remove sparc64 kernel support
Remove all sparc64 specific files
Remove all sparc64 ifdefs
Removee indireeect sparc64 ifdefs
Authored by: imp <imp@FreeBSD.org>
FreeBSD-commit: freebsd/freebsd@48b94864c5
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Ported-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes#10250
639dfeb831