Commit Graph

5 Commits

Author SHA1 Message Date
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
Justin T. Gibbs
87cfaf0e1f Add the XPT_PATH_STATS and XPT_GDEV_STATS function codes. These ccb
types allow the reporting of error counts and other statistics.  Currently
we provide information on the last BDR or bus reset as well as active
transaction inforamtion, but this will be expanded as more information is
added to aid in error recovery.

Use the 'last reset' information to better handle bus settle delays.
Peripheral drivers now control whether a bus settle delay occurs and
for how long.  This allows target mode peripheral drivers to avoid
having their device queue frozen by the XPT for what shoudl only be
initiator type behavior.

Don't perform a bus reset if the target device is incapable of performing
transfer negotiation (e.g. Fiber Channel).

If we don't perform a bus reset but the controller is capable of transfer
negotiations, force negotiations on the first transaction to go to the
device.  This ensures that we aren't tripped up by a left over negotiation
from the prom, BIOS, loader, etc.

Add a default async handler funstion to cam_periph.c to remove duplicated
code in all initiator type peripheral drivers.

Allow mapping of XPT_CONT_TARGET_IO ccbs from userland.  They are
itentical to XPT_SCSI_IO ccbs as far as data mapping is concerned.
1999-05-22 21:58:47 +00:00
Kenneth D. Merry
ee9c90c75c Fix a problem with the way we handled device invalidation when attaching
to a device failed.

In theory, the same steps that happen when we get an AC_LOST_DEVICE async
notification should have been taken when a driver fails to attach.  In
practice, that wasn't the case.

This only affected the da, cd and ch drivers, but the fix affects all
peripheral drivers.

There were several possible problems:
 - In the da driver, we didn't remove the peripheral's softc from the da
   driver's linked list of softcs.  Once the peripheral and softc got
   removed, we'd get a kernel panic the next time the timeout routine
   called dasendorderedtag().
 - In the da, cd and possibly ch drivers, we didn't remove the
   peripheral's devstat structure from the devstat queue.  Once the
   peripheral and softc were removed, this could cause a panic if anyone
   tried to access device statistics.  (one component of the linked list
   wouldn't exist anymore)
 - In the cd driver, we didn't take the peripheral off the changer run
   queue if it was scheduled to run.  In practice, it's highly unlikely,
   and maybe impossible that the peripheral would have been on the
   changer run queue at that stage of the probe process.

The fix is:
 - Add a new peripheral callback function (the "oninvalidate" function)
   that is called the first time cam_periph_invalidate() is called for a
   peripheral.

 - Create new foooninvalidate() routines for each peripheral driver.  This
   routine is always called at splsoftcam(), and contains all the stuff
   that used to be in the AC_LOST_DEVICE case of the async callback
   handler.

 - Move the devstat cleanup call to the destructor/cleanup routines, since
   some of the drivers do I/O in their close routines.

 - Make sure that when we're flushing the buffer queue, we traverse it at
   splbio().

 - Add a check for the invalid flag in the pt driver's open routine.

Reviewed by:	gibbs
1998-10-22 22:16:56 +00:00
Kenneth D. Merry
60a899a075 Fix a bug in the error recovery code. It was possible to have more than
one error recovery action oustanding for a given peripheral.

This is bad for several reasons.  The first problem is that the error
recovery actions would likely be to fix the same problem.  (e.g., we
queue 5 CCBs to a disk, and the first one comes back with 0x04,0x02.  We
start error recovery, and the second one comes back with the same status.
Then the third one comes back, and so on.  Each one causes the drive to get
nailed with a start unit, when we really only need one.)

The other problem is that we only have space to store one CCB while we're
doing error recovery.  The subsequent error recovery actions that got
started were over-writing the CCBs from previous error recovery actions,
but we still tried to call the done routine N times for N error recovery
actions.  Each call to dadone() was done with the same CCB, though.  So on
the second one, we got a "biodone: buffer not busy" panic, since the buffer
in question had already been through biodone().

In any case, this fixes things so that any any given time, there's only one
error recovery action outstanding for any given peripheral driver.

Reviewed by:	gibbs
Reported by:	Philippe Regnauld <regnauld@deepo.prosa.dk>
[ Philippe wins the "bug finder of the week" award ]
1998-10-13 21:41:32 +00:00
Justin T. Gibbs
8b8a9b1d3e CAM Transport Layer (XPT).
Submitted by:	The CAM Team
1998-09-15 06:33:23 +00:00