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the response queue. Instead of the ad hoc ISP_SWIZZLE_REQUEST, we now have
a complete set of inline functions in isp_inline.h. Each platform is
responsible for providing just one of a set of ISP_IOX_{GET,PUT}{8,16,32}
macros.
The reason this needs to be done is that we need to have a single set of
functions that will work correctly on multiple architectures for both little
and big endian machines. It also needs to work correctly in the case that
we have the request or response queues in memory that has to be treated
specially (e.g., have ddi_dma_sync called on it for Solaris after we update
it or before we read from it).
One thing that falls out of this is that we no longer build requests in the
request queue itself. Instead, we build the request locally (e.g., on the
stack) and then as part of the swizzling operation, copy it to the request
queue entry we've allocated. I thought long and hard about whether this was
too expensive a change to make as it in a lot of cases requires an extra
copy. On balance, the flexbility is worth it. With any luck, the entry that
we build locally stays in a processor writeback cache (after all, it's only
64 bytes) so that the cost of actually flushing it to the memory area that is
the shared queue with the PCI device is not all that expensive. We may examine
this again and try to get clever in the future to try and avoid copies.
Another change that falls out of this is that MEMORYBARRIER should be taken
a lot more seriously. The macro ISP_ADD_REQUEST does a MEMORYBARRIER on the
entry being added. But there had been many other places this had been missing.
It's now very important that it be done.
For OpenSD, it does a ddi_dmamap_sync as appropriate. This gets us out of
the explicit ddi_dmamap_sync on the whole response queue that we did for SBus
cards at each interrupt. Now, because SBus/sparc doesn't use bus_dma, some
shenanigans were done to support this. But Jason was nice enough to test the
SBus/sparcv9 changes for me, and they did the right thing as well.
Set things up so that platforms that cannot have an SBus don't get a lot of
the SBus code checks (dead coded out).
Additional changes:
Fix a longstanding buglet of sorts. When we get an entry via isp_getrqentry,
the iptr value that gets returned is the value we intend to eventually plug
into the ISP registers as the entry *one past* the last one we've written-
*not* the current entry we're updating. All along we've been calling sync
functions on the wrong index value. Argh. The 'fix' here is to rename all
'iptr' variables as 'nxti' to remember that this is the 'next' pointer-
not the current pointer.
Devote a single bit to mboxbsy- and set aside bits for output mbox registers
that we need to pick up- we can have at least one command which does not
have any defined output registers (MBOX_EXECUTE_FIRMWARE).
Explicitly decode GetAllNext SNS Response back *as* a GetAllNext response.
Otherwise, we won't unswizzle it correctly.
Nuke some additional __P macros.
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(Look ma, I might have broken the tree)
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Add support for 2 Gigabit cards (2300/2312). This necessitated a change
in how interrupts are down- the 23XX has not only a different place to check
for an interrupt, but unlike all other QLogic cards, you have to read the
status as a 32 bit word- not 16 bit words. Rather than have device specific
functions as called from the core module (in isp_intr), it makes more sense
to have the platform/bus modules do the gruntwork of splitting out the
isr, semaphore register and the first outgoing mailbox register (if needed)
*prior* to calling isp_intr (if calling isp_intr is necessary at all).
Rearchitect how regular SCSI parameters are stored or used.
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going to a synchronous restart queue blockage model. Add bits
that say that scsi xfer has a timer active.
Ha. ha ha. Add the bits that note that we have sense data when we
get it.
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anymore). Fix mailbox timeouts to correctly print out timing out
command.
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instrumentation for interrupts, specific topology preferences for
the 2200. Fix the hole in the OpenBSD port becuause there'd been
no maxluns limit from the midlayer and have the command routine
bounce commands > the maxluns for a particular controller (in
particular, Qlogic FC cards where we can't tell when it hasn't been
us that have loaded the F/W whether or not SCCLUN is in effect
or not).
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Major rewrite of a lot of internals- far too many to list. Cleaner
locking, more paramaterization, an isp_prt logging function that
handles debugging as well as error printouts. We also should no
longer hang if there is no Loop for Fibre Channel when booting.
The file ispvar.h now contains a list of all platform required macros
and explanation as to what they're for. This should make maintenance
easier.
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routines are not necessarily polled now- this should cut down on some of
the spurious lost commands that have occurred. Also, we now watchdog each
command and make sure that command constipation doesn't occur (which it
has been documented to do on the QLA2100 cards).
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Do some SNS fabric suppor tchanges. Roll revision levels. Tested on
GENERIC i386 && sparc.
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area (for dual bus support). Add in a proper XS_CHANNEL macro.
Reorder the printf level ifdefs- DEBUG should come before DIAGNOSTIC
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FABRIC support...
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