This is a completely rewritten scsipi_xfer execution engine, and the
associated changes to HBA drivers. Overview of changes & features:
- All xfers are queued in the mid-layer, rather than doing so in an
ad-hoc fashion in individual adapter drivers.
- Adapter/channel resource management in the mid-layer, avoids even trying
to start running an xfer if the adapter/channel doesn't have the resources.
- Better communication between the mid-layer and the adapters.
- Asynchronous event notification mechanism from adapter to mid-layer and
peripherals.
- Better peripheral queue management: freeze/thaw, sorted requeueing during
recovery, etc.
- Clean separation of peripherals, adapters, and adapter channels (no more
scsipi_link).
- Kernel thread for each scsipi_channel makes error recovery much easier
(no more dealing with interrupt context when recovering from an error).
- Mid-layer support for tagged queueing: commands can have the tag type
set explicitly, tag IDs are allocated in the mid-layer (thus eliminating
the need to use buggy tag ID allocation schemes in many adapter drivers).
- support for QUEUE FULL and CHECK CONDITION status in mid-layer; the command
will be requeued, or a REQUEST SENSE will be sent as appropriate.
Just before the merge syssrc has been tagged with thorpej_scsipi_beforemerge
siop2.c. Add wide negotiation and Ultra support. Modify siop.c to match
the siop2.c sync negotiation changes. The CyberStorm MKIII driver now
supports 15 targets. Remove some old table-driven sync rate stuff from
the original Zeus driver.
(currently only CD-ROM drives on i386). The sys/dev/scsipi system provides 2
busses to which devices can attach (scsibus and atapibus). This needed to
change some include files and structure names in the low level scsi drivers.
- Added support for multiple floppy drives
- CyberVision64:
- has now a real console mode
- another bugfix for boards with the new S3 chip
- Ariadne:
- fixed crashes with aeput (mbuf failure)
on the size of MI data structures that come before it in the softc.
Chip will not function properly if alignment is wrong. (as per OpenBSD)
Detected and fixed by: Chuck Cranor <chuck@ccrc.wustl.edu>
and Michael L Hitch <osymh@gemini.oscs.montana.edu>
Fix a bug in pt_enter_ptpage which caused MMU faults on low-mem conditions.
Change siop drivers to better handle sync.
Remove diag. done for ide -- its redundant as the ROM does similar.
fixed ite_filter to not panic if typing before the device is fully setup
All thanks to osymh@gemini.oscs.montana.edu (Michael L. Hitch)
and sbic from "Eduardo E. Horvath eeh@btr.com" <eeh@btr.btr.com>
Other cleanup (remove cpu040) and enabling IVS A500 support
from osymh@gemini.oscs.montana.edu (Michael L. Hitch)
Now use amiga HW for soft interrupts, non-contig options (2 or many chunks),
interrupt handler lists, 4066 ethernet, 1291 scsi, option to defer level 6
interrupts to level 4 (deal with icky built-in serial port)
bouyer