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
- pmap_enter()
- pmap_remove()
- pmap_protect()
- pmap_kenter_pa()
- pmap_kremove()
as described in pmap(9).
These calls are relatively conservative. It may be possible to
optimize these a little more.
calling pmap_steal_memory() directly. On these platforms, since
uvm_pageboot_alloc() is a wrapper around pmap_steal_memory(), there
is no functional change. This is merely for API consistency.
The ISA Bus on this machine doesn't support DMA, and all interrupt lines
are wire-OR'ed together. Mileage may vary if sharing interrupts.
Tested cards:
com: 8250 and 16550 UART's (8 bit)
ec: 3com Etherlink II (8 bit)
we: SMC 8013 Ethernet (16 bit) [work in progress]
Probes, ARP in both directions works, sends clean packets,
tcpdump show correct packets on receive, NDP for IPv6 works,
netstat -s shows nothing strange.. but doesn't talk TCP/IP!
- Correctly handle striding of data
- Better support for endian neutral access
- Correctly implement _stream variants of bus_space functions that can
byte swap. This reverses the automatic byte swapping done in hardware
for 16 bit ISA bus cards
- re-read RISC/os volume header off disk before writing new label
in case it was updated by installboot utility
- no longer keep a copy of the volume header in cpu_disklabel
This adds the missing wbflush() calls after writing register data.
At same time tidy up several comments and make several KNF changes.
XXX: The z8530 MI driver doesn't support bus_space access to the registers
(lacks a hook for storing a bus space tag, and stores register
addresses directly)
Until other ports catch up (this is the first) we have overlayed
the missing data in the MD structures
and link it directly to db_command_table[] so that it's not necessary
to do this at runtime. Make db_machine_command_table[] const on all ports.
g/c now unneded stuff, like db_machine_commands_install(), db_machine_init()
Patch written by enami.
