This adds 8 and 16 bit versions of the cmpset and fcmpset functions. Macros
are used to generate all the flavors from the same set of instructions; the
macro expansion handles the couple minor differences between each size
variation (generating ldrexb/ldrexh/ldrex for 8/16/32, etc).
In addition to handling new sizes, the instruction sequences used for cmpset
and fcmpset are rewritten to be a bit shorter/faster, and the new sequence
will not return false when *dst==*old but the store-exclusive fails because
of concurrent writers. Instead, it just loops like ldrex/strex sequences
normally do until it gets a non-conflicted store. The manpage allows LL/SC
architectures to bogusly return false, but there's no reason to actually do
so, at least on arm.
Reviewed by: cognet
PLL_MIPI is the last important PLL that we missed.
Add support for it.
Since it's one of the possible parent for TCON0 also add this clock
now that we can.
While here add some info about what video related clocks should be
enabled at boot and with what frequency.
Centralize calculation of signal and ucode delivered on unhandled page
fault in new function vm_fault_trap(). MD trap_pfault() now almost
always uses the signal numbers and error codes calculated in
consistent MI way.
This introduces the protection fault compatibility sysctls to all
non-x86 architectures which did not have that bug, but apparently they
were already much more wrong in selecting delivered signals on
protection violations.
Change the delivered signal for accesses to mapped area after the
backing object was truncated. According to POSIX description for
mmap(2):
The system shall always zero-fill any partial page at the end of an
object. Further, the system shall never write out any modified
portions of the last page of an object which are beyond its
end. References within the address range starting at pa and
continuing for len bytes to whole pages following the end of an
object shall result in delivery of a SIGBUS signal.
An implementation may generate SIGBUS signals when a reference
would cause an error in the mapped object, such as out-of-space
condition.
Adjust according to the description, keeping the existing
compatibility code for SIGSEGV/SIGBUS on protection failures.
For situations where kernel cannot handle page fault due to resource
limit enforcement, SIGBUS with a new error code BUS_OBJERR is
delivered. Also, provide a new error code SEGV_PKUERR for SIGSEGV on
amd64 due to protection key access violation.
vm_fault_hold() is renamed to vm_fault(). Fixed some nits in
trap_pfault()s like mis-interpreting Mach errors as errnos. Removed
unneeded truncations of the fault addresses reported by hardware.
PR: 211924
Reviewed by: alc
Discussed with: jilles, markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D21566
Convert all remaining references to that field to "ref_count" and update
comments accordingly. No functional change intended.
Reviewed by: alc, kib
Sponsored by: Intel, Netflix
Differential Revision: https://reviews.freebsd.org/D21768
- Remove a dead variable from the amd64 pmap_extract_and_hold().
- Fix grammar in the vm_page_wire man page.
Reported by: alc
Reviewed by: alc, kib
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D21639
The latest imported FDT data defines a node for an iomuxc-gpr device,
which we don't support (or need, right now) in addition to the usual
iomuxc device. Unfortunately, the dts improperly assigns overlapping
ranges of mmio space to both devices. The -gpr device is also a syscon
and simple_mfd device.
At runtime the simple_mfd driver attaches for the iomuxc-gpr node, then
when the real iomuxc driver comes along later, it fails to attach because
it tries to allocate its register space, and it's already partially in
use by the bogus instance of simple_mfd.
This change works around the problem by simply disabling the node for
the iomuxc-gpr device, since we don't need it for anything.
that makes the upstream FDT data work right, so we don't need to see a
couple dozen instances of it spam the dmesg at boot time unless it's a
verbose boot.
ioctl(2) handling. This allows doing the pps_event() work in the polling
routine, instead of using a taskqueue task to do that work.
Also, add PNPINFO, and switch to using make_dev_s() to create the cdev.
Using a spin mutex and calling pps_event() from the polling function works
around the situation which requires more than 2 sets of timecounter
timehands in a single-core system to get reliable PPS capture. That problem
would happen when a single-core system is idle in cpu_idle() then gets woken
up with an event timer event which was scheduled to handle a hardclock tick.
That processing path would end up calling tc_windup 3 or 4 times between
when the tc polling function was called and when the taskqueue task would
eventually run, and with only two sets of timehands, the th_generation count
would always be too old to allow the captured PPS data to be used.
There are several mechanisms by which a vm_page reference is held,
preventing the page from being freed back to the page allocator. In
particular, holding the page's object lock is sufficient to prevent the
page from being freed; holding the busy lock or a wiring is sufficent as
well. These references are protected by the page lock, which must
therefore be acquired for many per-page operations. This results in
false sharing since the page locks are external to the vm_page
structures themselves and each lock protects multiple structures.
Transition to using an atomically updated per-page reference counter.
The object's reference is counted using a flag bit in the counter. A
second flag bit is used to atomically block new references via
pmap_extract_and_hold() while removing managed mappings of a page.
Thus, the reference count of a page is guaranteed not to increase if the
page is unbusied, unmapped, and the object's write lock is held. As
a consequence of this, the page lock no longer protects a page's
identity; operations which move pages between objects are now
synchronized solely by the objects' locks.
The vm_page_wire() and vm_page_unwire() KPIs are changed. The former
requires that either the object lock or the busy lock is held. The
latter no longer has a return value and may free the page if it releases
the last reference to that page. vm_page_unwire_noq() behaves the same
as before; the caller is responsible for checking its return value and
freeing or enqueuing the page as appropriate. vm_page_wire_mapped() is
introduced for use in pmap_extract_and_hold(). It fails if the page is
concurrently being unmapped, typically triggering a fallback to the
fault handler. vm_page_wire() no longer requires the page lock and
vm_page_unwire() now internally acquires the page lock when releasing
the last wiring of a page (since the page lock still protects a page's
queue state). In particular, synchronization details are no longer
leaked into the caller.
The change excises the page lock from several frequently executed code
paths. In particular, vm_object_terminate() no longer bounces between
page locks as it releases an object's pages, and direct I/O and
sendfile(SF_NOCACHE) completions no longer require the page lock. In
these latter cases we now get linear scalability in the common scenario
where different threads are operating on different files.
__FreeBSD_version is bumped. The DRM ports have been updated to
accomodate the KPI changes.
Reviewed by: jeff (earlier version)
Tested by: gallatin (earlier version), pho
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D20486
Instead of using hardcoded bpp of 24, obtain current/configured value
from VideoCore. This solves certain problems with Xorg/Qt apps that
require bpp of 32 to work properly. The mode can be forced by setting
framebuffer_depth value in config.txt
PR: 235363
Submitted by: Steve Peurifoy <ssw01@mathistry.net>
o from FDT;
o from EFI;
o from Linux Boot API (ATAG).
U-Boot may pass RAM info all that 3 ways simultaneously.
We do select between FDT and EFI, but not for ATAG.
So this is not problem fix, but correctness check.
MFC after: 2 weeks
Many extern struct pcpu <something>__pcpu declarations were
copied/pasted in sources. The issue is that the definition is MD, but
it cannot be provided by machine/pcpu.h due to actual struct pcpu
defined in sys/pcpu.h later than the inclusion of machine/pcpu.h.
This forced the copying when other code needed direct access to
__pcpu. There is no way around it, due to machine/pcpu.h supplying
part of struct pcpu fields.
To work around the problem, add a new machine/pcpu_aux.h header, which
should fill any needed MD definitions after struct pcpu definition is
completed. This allows to remove copies of __pcpu spread around the
source. Also on x86 it makes it possible to remove work arounds like
OFFSETOF_CURTHREAD or clang specific warnings supressions.
Reported and tested by: lwhsu, bcran
Reviewed by: imp, markj (previous version)
Discussed with: jhb
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D21418
Many arm kernel configs bogusly specified WERROR=-Werror. There's no
reason for this because the default is that and there's no reason to
override. These date from a time when we needed to add additional
warning->error suppression. They are obsolete and were cut and paste
propagated from file to file.
Comment out all the WERROR=.... lines in powerpc. They aren't bogus,
but were appropriate for the old defaults for gcc4.2.1. Now that we've
made the policy decision to suppress -Werror by default on these
platforms, it is appropriate to comment these out. People wishing to
fix these errors can still un-comment them out, or say WERROR=-Werror
on the command line.
Fix two instances (cut and paste propagation) of hard-coded -Werror
in x86 code. Replace with ${WERROR} instead. This is a no-op change
except for people who build WERROR=-Wno-error :).
This should fix tinderbox / CI breakage.
ti,dual-volt property say that the eMMC support 1.8V and 3.3V not 3.0V
Use the correct caps for the mmc stack.
Note that the MMCHS_SD_CAPA register can only be written once after bootup
so if one is using a u-boot compiled with eMMC support (this is the default)
this code is a no-op but just in case someone have u-boot compiled without
eMMC support this make eMMC works when the kernel is booted.
MFC after: 1 week
The fdt node for this driver is a simple-mfd and syscon compatible one
meaning that simplemfd will be the driver attached for it. The gpio driver
is attached to the 'gpio' subnode so use syscon_get_handle_default to
obtain the handle of the syscon from the parent device and use this
to read/write to the memory region.
MFC after: 1 week
Since r349596 the syscon driver will map the memory. Since the gpio/pinctrl
controller wants it too set it to SHAREABLE.
This fix the gpio controller for attaching and so consumer can use it.
Now the sdhci_xenon driver can detect presence of an sdcard and attach
the mmc driver.
MFC after: 1 week
doing so adds more flexibility with less redundant code.
Reviewed by: jhb, markj, kib
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D21250
In r350842 I've switched the bus pass to resource so it matches the other
clock drivers but this cannot work as this drivers is meant to match
the dts node '/clocks' and if we don't do it at this pass simplebus is
catching this node and we cannot attach.
This solve booting on Allwinner boards that are still using /clocks (A20 SoC)
MFC after: 3 days
Move the floppy driver to the x86 specific notes file.
Reviewed by: jhb, manu, jhibbits, emaste
Differential Revision: https://reviews.freebsd.org/D21208
x86 needs sc, as does sparc64. powerpc doesn't use it by default, but some old
powermac notebooks do not work with vt yet for reasons unknonw. Even so, I've
removed it from powerpc LINT. It's not in daily use there, and the intent is to
100% switch to vt now that it works for that platform to limit support burden.
All the other architectures omit some or all of the screen savers from their
lint config. Move them to the x86 NOTES files and remove the exclusions. This
reduces slightly the number of savers sparc64 compiles, but since they are in
GENERIC, the overage is adequate and if someone reaelly wants to sort them out
in sparc64 they can sweat the details and the testing.
Reviewed by: jhb (earlier version), manu (earlier version), jhibbits
Differential Revision: https://reviews.freebsd.org/D21233
status register clears pending interrupts. By moving that code out of the
interrupt handler into a taskqueue task, I effectively created an interrupt
storm by returning from the handler with the interrupt source still active.
We'll have to find a different solution for this driver's need to sleep
in an ithread context.
Long ago this was needed, but now low-level i2c controller drivers cleverly
defer attachment of the bus until interrupts are enabled (if they require
interrupts to function), so that every i2c slave device doesn't have to.
We used the aw_clk_nm clock for clock with only one divider factor
and used a fake multiplier factor. This cannot work properly as we
end up writing the "fake" factor to the register (and so always set
the LSB to 1).
Create a new clock for those.
The reason for not using the clk_div clock is because those clocks are
a bit special. Since they are (almost) all related to video we also need
to set the parent clock (the main PLL) to a frequency that they can support.
As the main PLL have some minimal frequency that they can support we need to
be able to set the main PLL to a multiple of the desired frequency.
Let say you want to have a 71Mhz pixel clock (typical for a 1280x800 display)
and the main PLL cannot go under 192Mhz, you need to set it to 3 times the
desired frequency and set the divider to 3 on the hdmi clock.
So this also introduce the CLK_SET_ROUND_MULTIPLE flag that allow for this kind
of scenario.
- Put all clock and control unit driver in BUS_PASS_RESOURCE except
for the DE2 CCU as it needs the main CCU to be available.
- Use BUS_PASS_CPU for a20_cpu_cfg as it makes more sense.
- For aw_syscon use SCHEDULER pass as we need it early for drivers
that attach in BUS_PASS_SUPPORTDEV
- For the rest we can use BUS_PASS_SUPPORTDEV
The current implementation of gzipped a.out support was based
on a very old version of InfoZIP which ships with an ancient
modified version of zlib, and was removed from the GENERIC
kernel in 1999 when we moved to an ELF world.
PR: 205822
Reviewed by: imp, kib, emaste, Yoshihiro Ota <ota at j.email.ne.jp>
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D21099
Since DTS from >= Linux 5.0 the slave address are relative to the parent
node address and aren't the full ones.
Check both so the cpsw driver can find the phy id.
r350229 changed the code to lookup the ti,hwmods property in the parent
as it's now like that in the DTS from >= Linux 5.0, allow the property
to be also in the node itself so we can boot with an older DTB.
Reported by: "Dr. Rolf Jansen" <rj@obsigna.com>
Nothing uses these anymore. They were for super small armv4 boards without
uboot. We removed armv4 support before 13.0, but neglected to garbage collect
this at the same time. Today, both flavors of armv5 kernels (mv and ralink) boot
via uboot which has its own compression scheme for boards that need it.
Note: OLDFILES has not been updated beacuse installkernel will move the whole
directory out of the way before installing the new kernel.
Differential Revision: https://reviews.freebsd.org/D21072
syscallret() doesn't use error anymore. Fix a few other places to permit
removing the return value from syscallenter() entirely.
- Remove a duplicated assertion from arm's syscall().
- Use td_errno for amd64_syscall_ret_flush_l1d.
Reviewed by: kib
MFC after: 1 month
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D2090
Casueword(9) on ll/sc architectures must be prepared for userspace
constantly modifying the same cache line as containing the CAS word,
and not loop infinitely. Otherwise, rogue userspace livelocks the
kernel.
To fix the issue, change casueword(9) interface to return new value 1
indicating that either comparision or store failed, instead of relying
on the oldval == *oldvalp comparison. The primitive no longer retries
the operation if it failed spuriously. Modify callers of
casueword(9), all in kern_umtx.c, to handle retries, and react to
stops and requests to terminate between retries.
On x86, despite cmpxchg should not return spurious failures, we can
take advantage of the new interface and just return PSL.ZF.
Reviewed by: andrew (arm64, previous version), markj
Tested by: pho
Reported by: https://xenbits.xen.org/xsa/advisory-295.txt
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D20772
