and fixing some major bugs.
- Add support for the v5 firmware interface, used by the DAC1164P
(tested) and AcceleRAID 352 (untested but should work). We now cover
all of the Mylex family's protocols except for v2 (used by EISA and
Alpha-compatible cards).
- Fix an accounting bug which resulted in endless 'poll still busy'
messages. In situations of high controller load the count of poll
commands could be incremented without actually successfully launching
a command. This totally removes the accounting for status poll
commnads; it was its own worst enemy.
- Add some simple reentry prevention locks to processing of the waiting
and completed command queues to prevent races which could result in
I/O being done or completed twice (both are fatal). This highlights
a need for simple locking primitives in both the UP and SMP kernels.
- Streamline the handling of command completion to reduce the amount of
redundant work being done. Remove the code which tests for commands
that have gone missing in action; nobody has ever seen one of these
and it wouldn't have worked properly anyhow.
- Handle disconnection of drives from the controller in the detach,
not shutdown method. This avoids problems flushing the cache in
a panic when a drive is mounted.
- Don't call bus_generic_detach when disconnecting drives; it doesn't
actually do anything useful.
- Increment the log message index regardless of whether we actually
retrieved one or not. If we run into a message that we can't fetch,
we don't want to spin endlessly complaining about the fact.
- Don't assume that interrupts will work when we're flushing the
controller. We may think they are enabled, but in eg. a panic
situation the controller may not be able to deliver an interrupt.
The same goes for CD drivers and tape drivers. In systems with mixed IDE
and SCSI, devices in the same priority class will be sorted in attach
order.
Also, the 'CCD' priority is now the 'ARRAY' priority, and a number of
drivers have been modified to use that priority.
This includes the necessary changes to all drivers, except the ATA drivers.
Soren will modify those separately.
This does not include and does not require any change in the devstat
version number, since no known userland applications use the priority
enumerations.
Reviewed by: msmith, sos, phk, jlemon, mjacob, bde
device_add_child_ordered(). 'ivars' may now be set using the
device_set_ivars() function.
This makes it easier for us to change how arbitrary data structures are
associated with a device_t. Eventually we won't be modifying device_t
to add additional pointers for ivars, softc data etc.
Despite my best efforts I've probably forgotten something so let me know
if this breaks anything. I've been running with this change for months
and its been quite involved actually isolating all the changes from
the rest of the local changes in my tree.
Reviewed by: peter, dfr
Shift to using the same queueing strategy that the amr driver uses.
Some simple tests indicate that we use about 2% of the CPU at around
500tps with the controller completely saturated with I/O.
32 bytes is safe.
Handle successful completion of message log retrieval commands.
With these changes, the driver correctly handles the consequences of drive
death and replacement in a reliable array. Note that the massive backlog
of I/O during handling of such an event can kill the system if softupdates
is enabled.
PJ cards. This will probably also support the AcceleRAID and
eXtremeRAID cards, but nobody has volunteered one for testing, so I
haven't enabled their PCI device IDs.
Slightly clean up communication between the disk devices and the
controller device as per new practice, and move some more register-
related items int mlxreg.h from mlxvar.h.
Remove some unnecessary read-modify-write operations to the card
control registers; they don't behave like that.
Increase the status polling interval to 10 seconds. It's still possible
to load the card up to the point where a status poll will find the
previous poll still running, but this will reduce the incidence of
complaints.
