"*-out" is a complex way of phrasing the fact, and it causes
confusion for people.
Submitted by: debdrup
Approved by: bcr (mentor)
Differential Revision: https://reviews.freebsd.org/D23482
requested.
This is a tradeoff between PCIe efficiency during large packet rx and
packing efficiency during small packet rx.
MFC after: 1 week
Sponsored by: Chelsio Communications
If the thread's lock is already that of the runqueue, don't recurse on
the queue lock.
Reviewed by: jeff, kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23492
clang has the unfortunate property of paying little attention to prediction
hints when faced with a loop spanning the majority of the rotuine.
In particular fget_unlocked has an unlikely corner case where it starts almost
from scratch. Faced with this clang generates a maze of taken jumps, whereas
gcc produces jump-free code (in the expected case).
Work around the problem by providing a variant which only tries once and
resorts to calling the original code if anything goes wrong.
While here note that the 'seq' parameter is almost never passed, thus the
seldom users are redirected to call it directly.
This eliminates a branch from its consumers trading it for an extra call
if ktrace is enabled for curthread. Given that this is almost never true,
the tradeoff is worth it.
With r357314, sizeof(struct uma_bucket) grew to 16 bytes on 32-bit
platforms, so BUCKET_SIZE(4) is 0. This resulted in the creation of a
bucket zone for buckets with zero capacity. A more general fix is
planned, but for now this bandaid allows 32-bit platforms to boot again.
PR: 243837
Discussed with: jeff
Reported by: pho, Jenkins via lwhsu
Tested by: pho
Sponsored by: The FreeBSD Foundation
Most notably, we want to make sure we don't clobber any capabilities-related
errors. This is a regression from r357412 (O_SEARCH) that was picked up by
the capsicum tests.
PR: 243839
Reviewed by: kib (committed form recommended by)
Tested by: lwhsu
Differential Revision: https://reviews.freebsd.org/D23479
Once all CPUs are online, determine if they all support LSE atomics and
set lse_supported to indicate this. For now the atomic(9)
implementations are still always inlined, though it would be preferable
to create out-of-line functions to avoid text bloat. This was not done
here since big.little systems exist in which some CPUs implement LSE
while others do not, and ifunc resolution must occur well before this
scenario can be detected. It does seem unlikely that FreeBSD will
ever run on such platforms, however, so converting atomic(9) to use
ifuncs is probably a good next step.
Add a LSE_ATOMICS arm64 kernel configuration option to unconditionally
select LSE-based atomic(9) implementations when the target system is
known.
Reviewed by: andrew, kib
MFC after: 1 month
Sponsored by: The FreeBSD Foundation, Amazon (hardware)
Differential Revision: https://reviews.freebsd.org/D23325
These make use of the cas*, ld* and swp instructions added in ARMv8.1.
Testing shows them to be significantly more performant than LL/SC-based
implementations.
No functional change here since the wrappers still unconditionally
select the _llsc variants.
Reviewed by: andrew, kib
MFC after: 1 month
Submitted by: Ali Saidi <alisaidi@amazon.com> (original version)
Differential Revision: https://reviews.freebsd.org/D23324
Add a _llsc suffix for the existing LL/SC-based implementations and add
trivial wrappers. This is in preparation for supporting LSE-based
atomic(9) implementations.
No functional change intended.
Reviewed by: andrew, kib
MFC after: 1 month
Sponsored by: The FreeBSD Foundation, Amazon (hardware)
Differential Revision: https://reviews.freebsd.org/D23323
Parameterize the macros by type width as well as acq/rel semantics.
This makes modifying the implementations much less tedious and
error-prone and makes it easier to support alternate LSE-based
implementations. No functional change intended.
Reviewed by: andrew, kib
MFC after: 1 month
Sponsored by: The FreeBSD Foundation, Amazon (hardware)
Differential Revision: https://reviews.freebsd.org/D23322
Instead of doing a 2 iteration loop (determined at runeimt), take advantage
of the fact that the size is already known.
While here provdie cap_check_inline so that fget_unlocked does not have to
do a function call.
Verified with the capsicum suite /usr/tests.
It was generated to be just a jumping off point to tmpfs_itimes.
While here provide a dedicated variant for getattr since we normally don't
expect to need to the update from that caller.
Previously, addr2line would sequentially search all CUs for each input
address. For some uses, notably syzkaller's code coverage map generator,
this was extremely slow. Add a CU cache into which entries are added
following a successful lookup, and search the cache before falling back
to a scan. When translating a large number of addresses this yields
slightly better performance than GNU addr2line.
Garbage-collect an unused hash table which appears to have been intended
for the same purpose. A hash table doesn't seem particularly suitable
since each CU spans a range of addresses.
Submitted by: Tiger Gao <tig@freebsdfoundation.org>
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23418
Changes to units.1:
- Change the description to a more descriptive "conversion calculator".
- Sort options.
- Split the description into sections to make it easier to navigate the
manual page.
- Improve the description of various options.
- Document the default value of the output format.
- Use more mdoc macros for better readability.
- Document the behavior of the PATH environmental variable.
- Improve examples.
- Add sections: EXIT STATUS, DIAGNOSTICS, and HISTORY.
- Document that units(1) cannot convert negative values and it handles long
unit lists poorly.
- Update the documentation of the -V flag to match the implementation.
units(1) prints its version and the units data file instead of its
version and usage information.
Changes to units.c:
- Update usage information.
- Sort longopts elements.
This commit does not attempts to change the current behavior of units(1).
What's left to do is probably defining a better versioning (at the moment
units(1) always reports "FreeBSD units" as its version) and changing the
behavior of the -V flag to only print version.
Reviewed by: allanjude (earlier version), bcr
Approved by: bcr (mentor)
Differential Revision: https://reviews.freebsd.org/D18977
In r357324 most of the use of gi_irq was moved to gi_lpi. Complete this
with the last few places we need the IRQ value and create gi_id for the
per-device value we need.
MFC after: 2 weeks
Sponsored by: DARPA, AFRL
The code was using a hand-rolled fcmpset loop, while in other places the same
count is manipulated with the refcount API.
This transferred from a stylistic issue into a bug after the API got extended
to support flags. As a result the hand-rolled loop could bump the count high
enough to set the bit flag. Another bump + refcount_release would then free
the file prematurely.
The bug is only present in -CURRENT.
When there are multiple GICv3 ITS devices we don't know which vmem is for
which device. Use device_get_nameunit to get a per-device name.
MFC after: 2 weeks
Sponsored by: DARPA, AFRL
This uses UMA to allocate space. It causes issues when there are multiple
ITS devices in the system where interrupts are not allocated from a low
address on some interrupt controllers. Disabling the quantum cache fixes
this on the Neoverse N1 SDP.
MFC after: 2 weeks
Sponsored by: DARPA, AFRL
CD boot is broken for some systems since bioscd and biosdisk merge. The issue is that we can not use anything else than int 13 ah=0x4b to query cd information.
The patch does restore the same probe as was originally used in bioscd.c. Additionally extra buffer padding is used to avoid memory corruption caused by some systems.
PR: 234031
Reported by: ultramage and others
MFC after: 1 day
fonts. As a workaround, remove the static. vt is default on powerpc, but there's
a few old macs that still fail with vt. sc is used as a work arouond for those
machines, and the kernel fails to build w/o it.
Among the same justification as the other stdio _unlocked; in addition to an
inline version in <stdio.h>, we must provide a function in libc as well for
the functionality. This fixes the lang/gcc* builds, which want to use the
symbol from libc.
PR: 243810
Reported by: antoine, swills, Michael <michael.adm gmail com>
X-MFC-With: r357284
In r355656, endianness handling of the floating point environment was fixed
in the PowerPC code to work as intended.
However, one bit got missed, causing feholdexcept() to mis-save the fenv.
Submitted by: Renato Riolino <renato.riolino@eldorado.org.br>
Differential Revision: https://reviews.freebsd.org/D23382
