tty structures, and on some machines (namely the DraCo internal lpt, and some
multi-i/o boards for Amigas and DraCos), tying spltty to the pretty high printer
interupt level would hurt serial performance.
On all affected ports but Amiga, spllpt() has been defined in machine/intr.h
to be spltty(), thus preserving old behaviour. Portmasters are encouraged to
change is, if they feel something else is better (e.g., one of its own were
possible).
us to call isp_reset/isp_init internally with impunity.
Rename isp_phoenix to isp_restart and make it global. Clean it up a tad.
If we get an ASYNC_SYSTEM_ERROR code in isp_intr, call isp_restart and
return- the f/w is toasted at this point (usually), so we have to bring
things back to a known state.
In isp_mboxcmd, when we don't see the HOST_INT bit go clear, try and
find out if the isp is trying to tell us something and try again. This
may avoid a potential deadlock where the previous mailbox command hasn't
been cleared by the ISP.
In isp_init don't try and get device parameters if we already have them-
this typically doesn't work if we're in the middle of an isp_restart.
suggestion in draft-floyd-incr-init-win-03. Rather than scaling cwnd back
by the ratio of new segment size to old segment size, we perform a slow start
using the Initial Window, computed with the new segment size.
data ASC/ASCQ of 0x04/0x01 (logical unit not ready, initialization in progress),
hang out for 5 seconds and return a RETRY THE OPERATION command. If we
get a check condition/sense data ASC/ASCQ of 0x04/0x02 (logical unit not
ready, initialization command required), send a polled/nosleep START UNIT
command and return a RETRY THE OPERATION command if that succeeds.
Don't send a START UNIT to a disk quirked as SDEV_NO_START. Don't send
a START UNIT to removable media. The reason for the latter is to not
just blindly spin up new (maybe changed) media.
I should note that I've successfully made this work with the ISP host
adapter so far. Other host adapters will need some work to be able
to manage or reasonably fail NOSLEEP/POLL commands while in this
state. Alternatively, the internal SCSI midlayer structure has got
to allow for more controlled error recovery (e.g., restart queues
controlled by the target driver).
frueauf