Add support for passing in a mutex. If NULL is passed a global
subr_unit mutex is used.
Add alloc_unrl() which expects the mutex to be held.
Allocating a unit will never sleep as it does not need to allocate
memory.
Cut possible range in half so we can use -1 to mean "out of number".
Collapse first and last runs into the head by means of counters.
This saves memory in the common case(s).
ever working correctly: the code was linking the QHs together but
then immediately overwriting the "next" pointers. Oops. Also
initialise qh_endphub, since the EHCI spec says that we should
always set the pipe multiplier field to something sensible.
This appears to make basic split transactions work, so enable split
transactions for control, bulk and interrupt pipes (split isochronous
transfers are not yet implemented). It should now be possible to
use USB1 devices even when they are connected through a USB2 hub.
seem to be necessary anymore, and it prevents tasting a valid drive
when booting with geom_vinum already loaded, since SCSI disks set their
sectorsize not until first opening them.
from an mbuf into the fxp_encap() function, as done in other drivers.
- Don't waste time calling bus_dmamap_load_mbuf() if we know the mbuf
chain is too long to fit in a TX descriptor, call m_defrag() first.
- Convert fxp(4) to use bus_dmamap_load_mbuf_sg().
for the duration of the send() call. Such approach may be less than ideal
in threading environment, when several threads share the same socket and it
might happen that several of them are calling linux_send() at the same time
with and without SO_NOSIGPIPE set.
However, such race condition is very unlikely in practice, therefore this
change provides practical improvement compared to the previous behaviour.
PR: kern/76426
Submitted by: Steven Hartland <killing@multiplay.co.uk>
MFC after: 3 days
at some point result in a status event being triggered (it should
be a link down event: the Microsoft driver design guide says you
should generate one when the NIC is initialized). Some drivers
generate the event during MiniportInitialize(), such that by the
time MiniportInitialize() completes, the NIC is ready to go. But
some drivers, in particular the ones for Atheros wireless NICs,
don't generate the event until after a device interrupt occurs
at some point after MiniportInitialize() has completed.
The gotcha is that you have to wait until the link status event
occurs one way or the other before you try to fiddle with any
settings (ssid, channel, etc...). For the drivers that set the
event sycnhronously this isn't a problem, but for the others
we have to pause after calling ndis_init_nic() and wait for the event
to arrive before continuing. Failing to wait can cause big trouble:
on my SMP system, calling ndis_setstate_80211() after ndis_init_nic()
completes, but _before_ the link event arrives, will lock up or
reset the system.
What we do now is check to see if a link event arrived while
ndis_init_nic() was running, and if it didn't we msleep() until
it does.
Along the way, I discovered a few other problems:
- Defered procedure calls run at PASSIVE_LEVEL, not DISPATCH_LEVEL.
ntoskrnl_run_dpc() has been fixed accordingly. (I read the documentation
wrong.)
- Similarly, the NDIS interrupt handler, which is essentially a
DPC, also doesn't need to run at DISPATCH_LEVEL. ndis_intrtask()
has been fixed accordingly.
- MiniportQueryInformation() and MiniportSetInformation() run at
DISPATCH_LEVEL, and each request must complete before another
can be submitted. ndis_get_info() and ndis_set_info() have been
fixed accordingly.
- Turned the sleep lock that guards the NDIS thread job list into
a spin lock. We never do anything with this lock held except manage
the job list (no other locks are held), so it's safe to do this,
and it's possible that ndis_sched() and ndis_unsched() can be
called from DISPATCH_LEVEL, so using a sleep lock here is
semantically incorrect. Also updated subr_witness.c to add the
lock to the order list.
- "options" is followed by the characters \040\011, not \011\011.
Correct both my own sins and those of others.
- Comment blocks start and end with an empty line ^#$.
- Remove non-standard comments added in my last commit.
Requested by: njl
Correctness confirmed by: bde
since there are often significant holes in the memory map due to the
kernel, loader and OFW data structures not being included: Maxmem is
the highest available, so can be misleading.
them all, otherwise the driver will be useless and will only confuse user
as manual page says nothing about the need to enable one of those frame
types explicitly in the kernel config.
PR: kern/47152
Submitted by: Andriy Gapon <avg@icyb.net.ua>
MFC after: 3 days
as we can't rely on a trap happening, as it is done normally.
While I'm there, uncomment the call to cpu_dcache_wbinv_range() in
pmap_kenter_internal, as we don't call cpu_dcache_wbinv_all() there anymore.
asynchronously by different threads. Thus, declare as volatile the
reference count that is accessed through m_ext's pointer, ref_cnt.
Revert the previous change, revision 1.144, that casts as volatile a
single dereference of ref_cnt.
Reviewed by: bmilekic, dwhite
Problem reported by: kris
MFC after: 3 days
