in the shutdown_final state if the RB_NOSYNC flag is set.
The specific motivation in this case is that a system panic in an
interrupt context results in a call to module_shutdown(), which
calls g_modevent(), which calls g_malloc(..., M_WAITOK), which
results in a second panic. While g_modevent() could be fixed to
not call malloc() for MOD_SHUTDOWN events (which it doesn't handle
in any case), it is probably also a good idea to entirely skip the
execution of the module shutdown handlers after a panic.
This may be a MFC candidate for RELENG_5.
shutdown_pre_sync state if the RB_NOSYNC flag is set. This is the
likely cause of hangs after a system panic that are keeping crash
dumps from being done.
This is a MFC candidate for RELENG_5.
MFC after: 3 days
systems that have overlapping regions specified in their sysresource
objects. This patch fixes ATA DMA and acpi_timer allocation for such
sysctems. It should eventually be moved to resource_list_add() if it is
a valid generalized approach. The minimal approach for 5.3 is:
"Loop through all current resources to see if the new one overlaps
any existing ones. If so, the old one always takes precedence and
the new one is adjusted (or rejected). We check for three cases:
1. Tail of new resource overlaps head of old resource: truncate the
new resource so it is contiguous with the start of the old.
2. New resource wholly contained within the old resource: error.
3. Head of new resource overlaps tail of old resource: truncate the
new resource so it is contiguous, following the old."
Tested by: Radek Kozlowski <radek_at_raadradd.com>
Discussed with: imp
MFC after: 4 days
of 0x3f2-0x3f5,0x3f7 the ports are not 7 bytes apart. This should fix
floppy probing on such systems. (We handle the case of adjusting for
a start of 0x3f2 -> 0x3f0 separately, although that code should still be
checked if there are still floppy problems for others.)
Tested by: Sarunas Vancevicius <vsarunas_at_eircom.net>
MFC after: 3 days
sockets are connection-oriented for the purposes of kqueue
registration. Since UDP sockets aren't connection-oriented, this
appeared to break a great many things, such as RPC-based
applications and services (i.e., NFS). Since jmg isn't around I'm
backing this out before too many more feet are shot, but intend to
investigate the right solution with him once he's available.
Apologies to: jmg
Discussed with: imp, scottl
Centralize the fdctl_wr() function by adding the offset in
the resource to the softc structure.
Bugfix: Read the drive-change signal from the correct place:
same place as the ctl register.
Remove the cdevsw{} related code and implement a GEOM class.
Ditch the state-engine and park a thread on each controller
to service the queue.
Make the interrupt FAST & MPSAFE since it is just a simple
wakeup(9) call.
Rely on a per controller mutex to protect the bioqueues.
Grab GEOMs topology lock when we have to and Giant when
ISADMA needs it. Since all access to the hardware is
isolated in the per controller thread, the rest of the
driver is lock & Giant free.
Create a per-drive queue where requests are parked while
the motor spins up. When the motor is running the requests
are purged to the per controller queue. This allows
requests to other drives to be serviced during spin-up.
Only setup the motor-off timeout when we finish the last
request on the queue and cancel it when a new request
arrives. This fixes the bug in the old code where the motor
turned off while we were still retrying a request.
Make the "drive-change" work reliably. Probe the drive on
first opens. Probe with a recal and a seek to cyl=1 to
reset the drive change line and check again to see if we
have a media.
When we see the media disappear we destroy the geom provider,
create a new one, and flag that autodetection should happen
next time we see a media (unless a specific format is configured).
Add sysctl tunables for a lot of drive related parameters.
If you spend a lot of time waiting for floppies you can
grab the i82078 pdf from Intels web-page and try tuning
these.
Add sysctl debug.fdc.debugflags which will enable various
kinds of debugging printfs.
Add central definitions of our well known floppy formats.
Simplify datastructures for autoselection of format and
call the code at the right times.
Bugfix: Remove at least one piece of code which would have
made 2.88M floppies not work.
Use implied seeks on enhanced controllers.
Use multisector transfers on all controllers. Increase
ISADMA bounce buffers accordingly.
Fall back to single sector when retrying. Reset retry count
on every successful transaction.
Sort functions in a more sensible order and generally tidy
up a fair bit here and there.
Assorted related fixes and adjustments in userland utilities.
WORKAROUNDS:
Do allow r/w opens of r/o media but refuse actual write
operations. This is necessary until the p4::phk_bufwork
branch gets integrated (This problem relates to remounting
not reopening devices, see sys/*/*/${fs}_vfsops.c for details).
Keep PC98's private copy of the old floppy driver compiling
and presumably working (see below).
TODO (planned)
Move probing of drives until after interrupts/timeouts work
(like for ATA/SCSI drives).
TODO (unplanned)
This driver should be made to work on PC98 as well.
Test on YE-DATA PCMCIA floppy drive.
Fix 2.88M media.
This is a MT5 candidate (depends on the bioq_takefirst() addition).
It uses random offsets, random requests size and random operation type (READ or
WRITE). It also allows to run many processes to send I/O requests in parallel.
is an effective band-aid for at least some of the scheduler corruption seen
recently. The real fix will involve protecting threads while they are
inconsistent, and will come later.
Submitted by: julian
requires a recompile of netgraph users.
Also change the size of a field in the bluetooth code
that was waiting for the next change that needed recompiles so
it could piggyback its way in.
Submitted by: jdp, maksim
MFC after: 2 days
- Add a note about possibility for duplicate listing of devices.
- Auto generate device listings for the following drivers: ncr, sym,
umodem, and uscanner
MFC after: 3 days
changes to the ATA driver cause a kernel crash, no fault of the ATA
code. Work is in progress to add the necessary feature to the sparc64
kernel and this commit will be backed out when it is complete. This
bandaid is being put in mostly in the interests of getting the first
release snapshot done and out the door.
Tested on: Ultra-10 exhibiting the insta-panic.
MFC: Real Soon
If the bioq is empty, NULL is returned. Otherwise the front element
is removed and returned.
This can simplify locking in many drivers from:
lock()
bp = bioq_first(bq);
if (bp == NULL) {
unlock()
return
}
bioq_remove(bp, bq)
unlock
to:
lock()
bp = bioq_takefirst(bq);
unlock()
if (bp == NULL)
return;
