__amd64__, and thus limited. Eliminate 2 trivial conditionals by
casting the 64-bit integral, holding an address, via (uintptr_t)
to (void *) and replace the last remaining check for __amd64__
with a check for __LP64__ instead.
It turns out that in C++11, char16_t and char32_t are built-in types;
language keywords. Just fix this by putting traditional _*_T_DECLARED
blocks around the definitions. We'll just predefine these in
<sys/_types.h>.
This also opens up the possibility to define char16_t in other header
files, if ever needed (e.g. if we would gain a <ctype.h> for
char16_t/char32_t).
When creating fragment frames, the header length should honour the
DATAPAD flag.
This fixes the fragments that are queued to the ath(4) driver but it
doesn't yet fix fragment transmission. That requires further changes
to the ath(4) transmit path. Well, strictly speaking, it requires
further changes to _all_ wifi driver transmit paths, but this is at least
a start.
Tested:
* AR5416, STA mode, w/ fragthreshold set to 256.
This prevents users from selecting a delete method which may cause
corruption e.g. MPS WS16 on pre P14 firmware.
Reviewed by: pjd (mentor)
Approved by: pjd (mentor)
MFC after: 2 days
Assign the rv variable a success code if the pager was not asked for
the page. Using an error code from the previous processed page caused
zeroing of the valid page, when e.g. the previous page was not
available in the pager.
Reported by: lstewart
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
USDT probes exits. This was previously done with a callout; however, it is
possible to sleep while holding the DTrace mutexes, so a panic will occur
on INVARIANTS kernels if the callout handler can't immediately acquire one
of these mutexes. This panic will be frequently triggered on systems where
a USDT-enabled program (perl, for instance) is often run.
This revision changes the fasttrap cleanup mechanism so that a dedicated
thread is used instead of a callout. The old behaviour is otherwise
preserved.
Reviewed by: rpaulo
MFC after: 1 month
be a GOOD IDEA (TM).
Apparently MOST users set this (e.g. tcp and friends) but there are a few
users that just assume that it is a sensible value but then go on to read it.
These include SCTP, pf and the FLOWTABLE option (and maybe others).
avoid a dangling pointer and eventual panic on system shutdown.
Reported by: Ali <comnetboy at gmail.com>
Tested by: Ali <comnetboy at gmail.com>
MFC after: 1 week
ownership to the FreeBSD foundation for the years this file has been in
the FreeBSD repository.
This file was originally created by Juniper as part of upgrading to FreeBSD
4.10 (which had no MIPS support) and held functions found on other machines
It grew actual functionality over time. The functionaliy was copied from
other architectures and ported to MIPS on a as-needed basis.
Approved by: Mark Baushke (Juniper IP)
Approved by: Megan Sugiyama (Juniper legal)
Pointed out by: jmallett@
Requested by: core (jhb@)
pmap_enter_locked() implementation was very ambiguous and confusing.
Rearrange it so that each part of the mapping creation is separated.
Avoid walking through the redundant conditions.
Extract vector_page specific PTE setup from normal PTE setting.
Submitted by: Zbigniew Bodek <zbb@semihalf.com>
Sponsored by: The FreeBSD Foundation, Semihalf
Using PVF_MOD, PVF_REF and PVF_EXEC is redundant as we can get the proper
info from PTE bits.
When the mapping is marked as executable and has been referenced we assume
that it has been executed. Similarly, when the mapping is set to be writable
and is referenced, it must have been due to write access to it.
PVF_MOD and PVF_REF flags are kept just for pmap_clearbit() usage,
to pass the information on which bit should be cleared.
Submitted by: Zbigniew Bodek <zbb@semihalf.com>
Sponsored by: The FreeBSD Foundation, Semihalf
Use pmap_find_pv if needed instead of multiplying its code throughout
pmap-v6.
Avoid possible NULL pointer dereference in pmap_enter_locked()
When trying to get m->md.pv_memattr, make sure that m != NULL,
in particular that vector_page is set to be NULL.
Do not set PGA_REFERENCED flag in pmap_enter_pv().
On ARM any new page reference will result in either entering the new
mapping by calling pmap_enter, etc. or fixing-up the existing mapping in
pmap_fault_fixup().
Therefore we set PGA_REFERENCED flag in the earlier mentioned cases and
setting it later in pmap_enter_pv() is just waste of cycles.
Delete unused pm_pdir pointer from the pmap structure.
Rearrange brackets in the fault cause detection in trap.c
Place the brackets correctly in order to see course of the conditions
instantaneously.
Unify naming in pmap-v6.c and improve style
Use naming common for whole pmap and compatible with other pmaps,
improve style where possible:
pm -> pmap
pg -> m
opg -> om
*pt -> *ptep
*pte -> *ptep
*pde -> *pdep
Submitted by: Zbigniew Bodek <zbb@semihalf.com>
Sponsored by: The FreeBSD Foundation, Semihalf
bit in PTE.
Enable Access Flag in CPU control. With AF enabled each valid mapping
needs to have referenced bit in PTE set in order to be able to cache
it in the TLB.
AP[0] bit is to be used as reference flag.
All access permissions are encoded by AP[2:1] wherein AP[1] is in fact
"user enable" and AP[2](APX) is "write disable".
All mappings are always set to be valid. Reference emulation is performed
by setting/clearing reference flag in PTE.
md.pvh_attrs are no longer necessary however pv_flags are still being used
for now.
Marking vm_page as "dirty" or "referenced" is being performed on:
- page or flag fault servicing in pmap_fault_fixup(), basing on the fault
type
- vm_fault servicing in pmap_enter() according to the desired protections
and faulty access type
Redundant page marking has been removed as on ARM we know exactly when the
particular page is referenced or is going to be written.
Submitted by: Zbigniew Bodek <zbb@semihalf.com>
Sponsored by: The FreeBSD Foundation, Semihalf
xen/xenbus/xenbusb.c:
In xenbusb_probe_children(), do not modify the XenBus state of
devices for which we have no PV driver support. An emulated device
we do support may share this backend. Hide the node from XenBus
instead.
This prevents closing the vkbd device, which Qemu's emulated keyboard
device is using as the source for keyboard events.
Tested with qemu-xen-traditional, qemu-xen and qemu stubdomains, all
working as expected.
Submitted by: Roger Pau Monne <roger.pau@citrix.com>
Reviewed by: gibbs
MFC after: 1 week
dev/xen/netfront:
In netif_free(), properly stop the interface and drain any pending
timers prior to disconnecting from the backend device.
Remove all media and detach our interface object from the system
prior to deleting it.
PR: kern/176471
Submitted by: Roger Pau Monne <roger.pau@citrix.com>
Reviewed by: gibbs
MFC after: 1 week
from 1k to 20k The previous value was good 10 years ago, but not
anymore now.
More importantly, lots of good surprises:
polling is incredibly effective under virtualization, and not only
prevents livelock but also saves most of the VM exit overhead in
receive mode.
Using polling, a FreeBSD instance under qemu-kvm remains perfectly
responsive even when bombed with 10 Mpps over an emulated e1000,
and happily processes 1.7 Mpps through ipfw.
Note that some incompatibilities still remain: e.g. polling is not
(yet) compatible with netmap, and seems to freeze the guest when
kern.polling.idle_poll=1
MFC after: 3 days
an error. One could argue that returning a buffer even when it is
not valid is incorrect, but bread has always returned a buffer
valid or not.
Reviewed by: kib
MFC after: 2 weeks
the return value is NULL. Based on the returned flags, the
return value should never be inspected in the case where NULL
is returned, but it is good coding practice not to return a
pointer to freed memory.
Found by: Coverity Scan, CID 1006096
Reviewed by: kib
MFC after: 2 weeks
o Relax locking assertions for pmap_enter_object() and add them also
to architectures that currently don't have any
o Introduce VM_OBJECT_LOCK_DOWNGRADE() which is basically a downgrade
operation on the per-object rwlock
o Use all the mechanisms above to make vm_map_pmap_enter() to work
mostl of the times only with readlocks.
Sponsored by: EMC / Isilon storage division
Reviewed by: alc
The <uchar.h> header, part of C11, adds a small number of utility
functions for 16/32-bit "universal" characters, which may or may not be
UTF-16/32. As our wchar_t is already ISO 10646, simply add light-weight
wrappers around wcrtomb() and mbrtowc().
While there, also add (non-yet-standard) _l functions, similar to the
ones we already have for the other locale-dependent functions.
Reviewed by: theraven
traffic.
When transmitting non-aggregate traffic, we need to keep the hardware
busy whilst transmitting or small bursts in txdone/tx latency will
kill us.
This restores non-aggregate iperf performance, especially when doing
TDMA.
Tested:
* AR5416<->AR5416, TDMA
* AR5416 STA <-> AR9280 AP
of course.)
There's a few things that needed to happen:
* In case someone decides to set the beacon transmission rate to be
at an MCS rate, use the MCS-aware version of the duration calculation
to figure out how long the received beacon frame was.
* If TxOP enforcing is available on the hardware and we're doing TDMA,
enable it after a reset and set the TDMA guard interval to zero.
This seems to behave fine.
TODO:
* Although I haven't yet seen packet loss, the PHY errors that would be
triggered (specifically Transmit-Override-Receive) aren't enabled
by the 11n HAL. I'll have to do some work to enable these PHY errors
for debugging.
What broke:
* My recent changes to the TX queue handling has resulted in the driver
not keeping the hardware queue properly filled when doing non-aggregate
traffic. I have a patch to commit soon which fixes this situation
(albeit by reminding me about how my ath driver locking isn't working
out, sigh.)
So if you want to test this without updating to the next set of patches
that I commit, just bump the sysctl dev.ath.X.hwq_limit from 2 to 32.
Tested:
* AR5416 <-> AR5416, with ampdu disabled, HT40, 5GHz, MCS12+Short-GI.
I saw 30mbit/sec in both directions using a bidirectional UDP test.
the right type for the argument in syscalls.master. Also fix the
posix_fallocate(2) and posix_fadvise(2) compat32 syscalls on the
architectures which require padding of the 64bit argument.
Noted and reviewed by: jhb
Pointy hat to: kib
MFC after: 1 week
for the case when the nullfs vnode is not reclaimed. Otherwise, later
reclamation would not unlock the lower vnode.
Reported by: antoine
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
registers also on other CPUs, besides the CPU which happens to execute
the ddb. The debugging registers are stored in the pcpu area,
together with the command which is executed by the IPI stop handler
upon resume.
Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
a vm page, denoted either by an address of the struct vm_page, or, if
the '/p' modifier is specified, by a physical address of the
corresponding frame.
Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
