Commit Graph

92 Commits

Author SHA1 Message Date
Matt Jacob
e95725cb76 Most of these changes to isp are to allow for isp.ko unloading.
We also revive loop down freezes. We also externaliz within isp
isp_prt_endcmd so something outside the core module can print
something about a command completing. Also some work in progress to
assist in handling timed out commands better.

Partially Sponsored by: Panasas
Approved by:	re (kib)
MFC after:	1 month
2011-08-13 23:34:17 +00:00
Matt Jacob
898899d9dd Sync FreeBSD ISP with mercurial tree. Minor changes having to do with
a macro for minima.
2011-02-28 15:58:30 +00:00
Marius Strobl
37bb79f173 - Use the correct DMA tag/map pair for synchronize the FC scratch area.
- Allocate coherent DMA memory for the request/response queue area and
  and the FC scratch area.

These changes allow isp(4) to work properly on sparc64 with usage of the
IOMMU streaming buffers enabled.

Approved by:	mjacob
MFC after:	2 weeks
2011-02-14 21:50:51 +00:00
Matt Jacob
427fa8f9fe Whap. Hook up some wires that were forgotten a few months ago and restore
the zombie device timeout code and the loop down time code and the fabric
hysteresis code.
MFC after:	1 week
Sponsored By:	Panasas
2010-05-15 20:26:10 +00:00
Matt Jacob
670508b16a Clean up some printing stuff so that we can have a bit finer control
on debug output. Add a new platform function requirement to allow
for printing based upon the ITL nexus instead of the isp unit plus
channel, target and lun. This allows some printouts and error messages
from the core code to appear in the same format as the platform's
subsystem (in FreeBSD's case, CAM path).

MFC after:	1 week
2010-03-26 15:13:31 +00:00
Matt Jacob
c8b8a2c4e6 Redo how commands handles are created and managed and implement sequence
numbers and handle types in rational way. This will better protect from
(unwittingly) dealing with stale handles/commands.

Fix the watchdog timeout code to better protect itself from mistakes.

If we run an abort on a putatively timed out command, the command
may in fact get completed, so check to make sure the command we're
timing it out is still around. If the abort succeeds, btw, the command
should get returned via a different path.
2010-02-03 21:09:32 +00:00
Matt Jacob
2df76c160b Add 8Gb support (isp_2500). Fix a fair number of configuration and
firmware loading bugs.

Target mode support has received some serious attention to make it
more usable and stable.

Some backward compatible additions to CAM have been made that make
target mode async events easier to deal with have also been put
into place.

Further refinement and better support for NP-IV (N-port Virtualization)
is now in place.

Code for release prior to RELENG_7 has been stripped away for code clarity.

Sponsored by: Copan Systems

Reviewed by:    scottl, ken, jung-uk kim
Approved by:    re
2009-08-01 01:04:26 +00:00
Matt Jacob
4607e8eed3 Recover from some major omissions/problems with the 24XX port.
First, we were never correctly checking for a 24XX Status Type 0
response- that cased us to fall through to evaluate status for
commands as if this were a 2100/2200/2300 Status Type 0 response.
This is *close*, but not quite the same. This has been reported
to be apparent with some wierd lun configuration problems with
some arrays. It became glaringly apparent on sparc64 where none
of the correct byte swap things were done.

Fixing this omission then caused a whole universe shifting debug
cycle of endian issues for the 2400. The manual for 24XX f/w turns
out to be wrong about the endianness of a couple of entities. The
lun and cdb fields for the type 7 request are *not* unconditionally
big endian- they happen to be opposite of whatever the endian of
the current machine type is. Same with the sense data for the
24XX type 0 response.

While we're at it investigate and resolve some NVRAM endian
issues.

Approved by:	re (ken)
MFC after:	3 days
2007-07-02 20:08:20 +00:00
Matt Jacob
5f634111fa MFP4: a) Some constification from NetBSD (gcc 4.1.2)
b) Split default param fetching/setting into scsi and fibre functions
and retry the fibre fetch more than once.

MFC after:	1 week
2007-03-22 23:38:32 +00:00
Matt Jacob
e48b2487a0 Fix some stupid copyright mistakes that have been there for quite some time. 2007-03-10 02:39:54 +00:00
Matt Jacob
6c81a0aecb MFP4: Move default setting to the end of isp_reset instead of the
front of isp_init so we can read NVRAM even if we're role ISP_NONE.
Prepare for reintroduction of channels (for FC) for N-Port
Virtualization.

Fix a botch in handle assignment that caused us to nuke one device
when a new one arrives and end up with two devices with the same
identity in the virtual target mapping table.
2007-01-20 04:00:21 +00:00
Matt Jacob
dd9fc7c319 Make ISPCTL_PLOGX find a handle to log into the management server
with- not hope for the best. Change some things which were gated
off of 24XX to be gated off of 2K login support. Convert some
isp_prt calls to xpt_print calls.
2006-12-05 07:50:23 +00:00
Matt Jacob
04697f7aa3 Make the SAN login/logout stuff more common between different chipsets
and provied an isp_control entry point so that the outer layers can
do PLOGI/LOGO explicitly. Add MS IOCB support. This completes the cycle
for base support for SMI-S.
2006-11-18 03:53:16 +00:00
Matt Jacob
f7c631bcf0 Push things closer to path failover by implementing loop down and
gone device timers and zombie state entries. There are tunables
that can be used to select a number of parameters.

loop_down_limit - how long to wait for loop to come back up before
declaring
all devices dead (default 300 seconds)

gone_device_time- how long to wait for a device that has appeared
to leave the loop or fabric to reappear (default 30 seconds)

Internal tunables include (which should be externalized):

quick_boot_time- how long to wait when booting for loop to come up

change_is_bad- whether or not to accept devices with the same
WWNN/WWPN that reappear at a different PortID as being the 'same'
device.

Keen students of some of the subtle issues here will ask how
one can keep devices from being re-accepted at all (the answer
is to set a gone_device_time to zero- that effectively would
be the same thing).
2006-11-14 08:45:48 +00:00
Matt Jacob
10365e5a68 Add 4Gb (24XX) support and lay the foundation for a lot of new stuff. 2006-11-02 03:21:32 +00:00
Matt Jacob
6322f5abb7 The macro IS_23XX should not mistakenly include 24XX cards. 2006-08-14 05:35:41 +00:00
Matt Jacob
8a97c03a7a Do various fixes to support firmware loading for the 2322
(and by extension, the 2422).

One peculiar thing I've found with the 2322 is that if you
don't force it to do Hard LoopID acquisition, the firmware
crashes. This took a while to figure out.

While we're at it, fix various bugs having to do with NVRAM
reading and option setting with respect to pieces of NVRAM.
2006-07-03 08:24:09 +00:00
Matt Jacob
f1c6617ad4 Fix longstanding bug where exec throttle is 16 bits- not 8. 2006-05-22 06:47:20 +00:00
Matt Jacob
1dae40eb49 a) clean up some declaration stuff (i.e., make more modern with respect
to getting rid u_int for uint and so on).

b) Turn back on 64 bit DAC support. Cheeze it a bit in that we have two
DMA callback functions- one when we have bus_addr_t > 4 bits in width and
the other which should be normal. Even Cheezier in that we turn off setting
up DMA maps to be BUS_SPACE_MAXADDR if we're in ISP_TARGET_MODE. More work
on this in a week or so.

c) Tested under amd64 and 1MB DFLTPHYS, sparc64, i386 (PAE, but insufficient
memory to really test > 4GB). LINT check under amd64.

MFC after:	1 month
2006-02-15 00:31:48 +00:00
Matt Jacob
53af7d226e Remove use of inlines and use the functions as a library.
Larger code space, possibly performance hit, but more portable.
Certainly less questionable use of inlining.

Suggested by: des
2006-02-02 21:31:34 +00:00
Matt Jacob
e526523707 First of several commits as this driver is dusted off and maybe brought
up to date.  Principle changes for this reelase is to support 2K Port Login
firmware. This allows us to support the 2322 (and 2422 4Gb) cards which only
come with the 2K Port Login firmware. The 2322 should now work- but we don't
have firmware sets for it in ispfw (as the change to load 2K Port Login f/w
hasn't been made- that f/w is so big it has to be loaded in more than one
chunk).

Other changes are the beginnings of cleaning up some long standing target
mode issues. The next changes here will incorporate a lot of bug fixes
from others.

Finally, some copyright cleanup and attempts to make the parts of the
driver that are FreeBSD specific start conforming more to FreeBSD style.

MFC after:	1 month
2006-01-23 06:23:37 +00:00
Matt Jacob
547725be50 Refactor isp_prt declaration so that platform
requirements can stay in platform files.
2005-05-11 00:22:17 +00:00
Stefan Farfeleder
e68c6390f4 Prefer <sys/cdefs.h>'s __printflike() macro to the recently added
__GNUCLIKE_ATTRIBUTE_PRINTF.

Approved by:	mjacob
2005-03-07 15:29:11 +00:00
Joerg Wunsch
a5f50ef9e4 netchild's mega-patch to isolate compiler dependencies into a central
place.

This moves the dependency on GCC's and other compiler's features into
the central sys/cdefs.h file, while the individual source files can
then refer to #ifdef __COMPILER_FEATURE_FOO where they by now used to
refer to #if __GNUC__ > 3.1415 && __BARC__ <= 42.

By now, GCC and ICC (the Intel compiler) have been actively tested on
IA32 platforms by netchild.  Extension to other compilers is supposed
to be possible, of course.

Submitted by:	netchild
Reviewed by:	various developers on arch@, some time ago
2005-03-02 21:33:29 +00:00
Matt Jacob
99334b0de4 Roll minor number.
MFC after:	2 weeks
2005-01-23 06:27:05 +00:00
Warner Losh
098ca2bda9 Start each of the license/copyright comments with /*-, minor shuffle of lines 2005-01-06 01:43:34 +00:00
Nate Lawson
51e2355882 Store the target handles in a separate list from normal commands. Add a
CTIO fast post routine to handle CTIO completions.

Submitted by:	mjacob
2004-05-24 07:02:25 +00:00
Tom Rhodes
a122cca953 These are changes to allow to use the Intel C/C++ compiler (lang/icc)
to build the kernel. It doesn't affect the operation if gcc.

Most of the changes are just adding __INTEL_COMPILER to #ifdef's, as
icc v8 may define __GNUC__ some parts may look strange but are
necessary.

Additional changes:
 - in_cksum.[ch]:
   * use a generic C version instead of the assembly version in the !gcc
     case (ASM code breaks with the optimizations icc does)
     -> no bad checksums with an icc compiled kernel
     Help from:		andre, grehan, das
     Stolen from: 	alpha version via ppc version
     The entire checksum code should IMHO be replaced with the DragonFly
     version (because it isn't guaranteed future revisions of gcc will
     include similar optimizations) as in:
        ---snip---
          Revision  Changes    Path
          1.12      +1 -0      src/sys/conf/files.i386
          1.4       +142 -558  src/sys/i386/i386/in_cksum.c
          1.5       +33 -69    src/sys/i386/include/in_cksum.h
          1.5       +2 -0      src/sys/netinet/igmp.c
          1.6       +0 -1      src/sys/netinet/in.h
          1.6       +2 -0      src/sys/netinet/ip_icmp.c

          1.4       +3 -4      src/contrib/ipfilter/ip_compat.h
          1.3       +1 -2      src/sbin/natd/icmp.c
          1.4       +0 -1      src/sbin/natd/natd.c
          1.48      +1 -0      src/sys/conf/files
          1.2       +0 -1      src/sys/conf/files.amd64
          1.13      +0 -1      src/sys/conf/files.i386
          1.5       +0 -1      src/sys/conf/files.pc98
          1.7       +1 -1      src/sys/contrib/ipfilter/netinet/fil.c
          1.10      +2 -3      src/sys/contrib/ipfilter/netinet/ip_compat.h
          1.10      +1 -1      src/sys/contrib/ipfilter/netinet/ip_fil.c
          1.7       +1 -1      src/sys/dev/netif/txp/if_txp.c
          1.7       +1 -1      src/sys/net/ip_mroute/ip_mroute.c
          1.7       +1 -2      src/sys/net/ipfw/ip_fw2.c
          1.6       +1 -2      src/sys/netinet/igmp.c
          1.4       +158 -116  src/sys/netinet/in_cksum.c
          1.6       +1 -1      src/sys/netinet/ip_gre.c
          1.7       +1 -2      src/sys/netinet/ip_icmp.c
          1.10      +1 -1      src/sys/netinet/ip_input.c
          1.10      +1 -2      src/sys/netinet/ip_output.c
          1.13      +1 -2      src/sys/netinet/tcp_input.c
          1.9       +1 -2      src/sys/netinet/tcp_output.c
          1.10      +1 -1      src/sys/netinet/tcp_subr.c
          1.10      +1 -1      src/sys/netinet/tcp_syncache.c
          1.9       +1 -2      src/sys/netinet/udp_usrreq.c

          1.5       +1 -2      src/sys/netinet6/ipsec.c
          1.5       +1 -2      src/sys/netproto/ipsec/ipsec.c
          1.5       +1 -1      src/sys/netproto/ipsec/ipsec_input.c
          1.4       +1 -2      src/sys/netproto/ipsec/ipsec_output.c

          and finally remove
            sys/i386/i386        in_cksum.c
            sys/i386/include     in_cksum.h
        ---snip---
 - endian.h:
   * DTRT in C++ mode
 - quad.h:
   * we don't use gcc v1 anymore, remove support for it
   Suggested by:	bde (long ago)
 - assym.h:
   * avoid zero-length arrays (remove dependency on a gcc specific
     feature)
     This change changes the contents of the object file, but as it's
     only used to generate some values for a header, and the generator
     knows how to handle this, there's no impact in the gcc case.
   Explained by:	bde
   Submitted by:	Marius Strobl <marius@alchemy.franken.de>
 - aicasm.c:
   * minor change to teach it about the way icc spells "-nostdinc"
   Not approved by:	gibbs (no reply to my mail)
 - bump __FreeBSD_version (lang/icc needs to know about the changes)

Incarnations of this patch survive gcc compiles since a loooong time,
I use it on my desktop. An icc compiled kernel works since Nov. 2003
(exceptions: snd_* if used as modules), it survives a build of the
entire ports collection with icc.

Parts of this commit contains suggestions or submissions from
Marius Strobl <marius@alchemy.franken.de>.

Reviewed by:	-arch
Submitted by:	netchild
2004-03-12 21:45:33 +00:00
Matt Jacob
e0d3cfb7be Change role defines so that they better match class 3 service parameters.
Add ISPCTL_GET_PDB isp_control operation.

MFC after:	1 week
2004-02-07 03:38:39 +00:00
Matt Jacob
4b39f27d17 NetBSD'er with time on their hands (dma->DMA) 2003-09-13 01:59:14 +00:00
Matt Jacob
f556e83b61 This should enable 10160 support. As best as I can tell, the same
f/w as 12160 is used, and otherwise, this is just a single channel
variant of the 10160.

MFC after:	0 days
2002-10-11 17:28:01 +00:00
Matt Jacob
66cbe912a9 Remove ISP_DMA_ADDR_T definition.
Instead, based upon whether ISP_DAC_SUPPORTED is defined, typedef
isp_dma_addr_t appropriately.

If ISP_DAC_SUPPORTRED is defined, the DMA_WD2/DMA_WD3 macros do something
useful, else they define to '0'.
2002-09-23 05:09:23 +00:00
Matt Jacob
99b57e408b Remove STRNCAT (==>strncat) usage. Apparently I never read the man
page correctly and it wasn't doing what I thought it was.

Noticed by: Brooks Davis <brooks@one-eyed-alien.net>
2002-09-06 18:32:16 +00:00
Matt Jacob
e347e2c9b4 Add ISPASYNC_FW_DUMPED async event.
add ISP_FW_NEWER_THAN macro- makes the code easier to read.
2002-08-17 17:19:09 +00:00
Matt Jacob
0499ae008f Roll minor version. Add ISPASYNC_FW_RESTARTED async event. Add
DEFAULT_FRAMESIZE && DEFAULT_EXEC_THROTTLE references.

MFC after:	1 week
2002-06-16 04:52:53 +00:00
Matt Jacob
029f13c671 Fix bus dma segment count to be based off of MAXPHYS, not BUS_SPACE_MAXSIZE.
Grumble. I've seen better documented architectures out of Redmond.

Redo fabric evaluation to not use GET ALL NEXT (GA_NXT). Switches seem
to be trying to wriggle out of supporting this well. Instead, use
GID_FT to get a list of Port IDs and then use GPN_ID/GNN_ID to find the
port and node wwn. This should make working on fabrics a bit cleaner and
more stable.

This also caused some cleanup of SNS subcommand canonicalization so that
we can actually check for FS_ACC and FS_RJT, and if we get an FS_RJT,
print out the reason and explanation codes.

We'll keep the old GA_NXT method around if people want to uncomment a
controlling definition in ispvar.h.

This also had us clean up ISPASYNC_FABRICDEV to use a local lportdb argument
and to have the caller explicitly say that a device is at the end of the
fabric list.

MFC after:	1 week
2002-04-04 23:46:01 +00:00
Matt Jacob
1923f73990 Redo stuff for sparc64- primarily fix bus dma implementation. The endian
stuff was right, but the busdma stuff was massively not right.

Didn't really test on ia64 or i386- don't have the former h/w and my
FreeBSD-current disk is unwell right now. Hope that this is okay.

MFC after:	1 week
2002-04-02 23:36:14 +00:00
Matt Jacob
371777b161 Limit fabric search to a default 256 entries. This will all go away
soon because it's just getting harder and harder to find switches
that correctly implement the GET ALL NEXT subcommands for the SNS
protocol.

Latch up result out pointer and set a busy flag when we're looking
at the response queue. This allows for a cleaner way to make sure
we don't get multiple CPUs trying to read the same response queue
entries.

Change how isp_handle_other_response returns values (clarity).

Make PORT UNAVAILABLE the same as PORT LOGOUT (force a LIP).

Do some formatting changes.

MFC after:	0 days
2002-03-21 21:10:16 +00:00
Matt Jacob
01ff579d86 Add in support firmware crash dumps. Change CFG options to split
WWN into WWNN and WWPN.

MFC after:	1 week
2002-02-17 06:32:58 +00:00
Matt Jacob
75c1e828c0 + A variety of 23XX changes:
disable MWI on 2300

	based on function code, set an 'isp_port' for the 2312- it's a
	separate instance, but the NVRAM is shared, and the second port's
	NVRAM is at offset 256.

+ Enable RIO operation for LVD SCSI cards. This makes a *big* difference
as even under reasonable load we get batched completions of about 30
commands at a time on, say, an ISP1080.

+ Do 'continuation' mailbox commands- this allows us to specify a work
area within the softc and 'continue' repeated mailbox commands. This is
more or less on an ad hoc basis and is currently only used for firmware
loading (which f/w now loads substantially faster becuase the calling
thread is only woken when all the f/w words are loaded- not for each
one of the 40000 f/w words that gets loaded).

+ If we're about to return from isp_intr with a 'bogus interrupt' indication,
and we're not a 23XX card, check to see whether the semaphore register is
currently *2* (not *1* as it should be) and whether there's an async completion
sitting in outgoing mailbox0. This seems to capture cases of lost fast posting
and RIO interrupts that the 12160 && 1080 have been known to pump out under
extreme load (extreme, as in > 250 active commands).

+ FC_SCRATCH_ACQUIRE/FC_SCRATCH_RELEASE macros.

+ Endian correct swizzle/unswizzle of an ATIO2 that has a WWPN in it.

MFC after:	1 week
2002-02-04 21:04:25 +00:00
Matt Jacob
2903b27203 Implement REDUCED INTERRUPT OPERATION usage form FC cards- this allows the
firmware to delay completion of commands so that it can attempt to batch
a bunch of completions at once- either returning 16 bit handles in mailbox
registers, or in a resposne queue entry that has a whole wad of 16 bit handles.

Distinguish between 2300 and 2312 chipsets- if only because the revisions
on the chips have different meanings.

Add more instrumentation plus ISP_GET_STATS and ISP_CLR_STATS ioctls.
Run up the maximum number of response queue entities we'll look at
per interrupt.

If we haven't set HBA role yet, always return success from isp_fc_runstate.

MFC after:	2 weeks
2002-01-03 20:43:22 +00:00
Matt Jacob
4fd13c1ba2 Major restructuring for swizzling to the request queue and unswizzling from
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). It also has to handle the SBus cards (for
platforms that have them) which, while on a Big Endian machine, do *not*
require *most* of the request/response queue entry fields to be swizzled
or unswizzled.

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.

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).

MFC after:	2 weeks
2001-12-11 00:18:45 +00:00
Matt Jacob
c507669af4 Implement a call to get the actual link data rate (if 23XX) so we can
set whether it's a 2Gps or 1Gps link.

MFC after:	1 week
2001-10-01 03:45:54 +00:00
Matt Jacob
f8597b62e5 Add some more firmware revision macros. Add firmware attributes field
to fcparam structure.
MFC after:	4 weeks
2001-09-03 03:03:32 +00:00
Matt Jacob
126ec86486 Add 2 Gigabit Fibre Channel support (2300 && 2312 cards). This required
some reworking (and consequent cleanup) of the interrupt service code.

Also begin to start a cleanup of target mode support that will (eventually)
not require more inforamtion routed with the ATIO to come back with the
CTIO other than tag.

MFC after:	4 weeks
2001-08-31 21:39:04 +00:00
Matt Jacob
561e7bb942 Fix a spelling error in a comment. 2001-08-16 17:31:27 +00:00
Matt Jacob
d9c272f3ea Redo how we manage SCSI device settings- have a 3rd flags (nvram) that records
either what's in NVRAM or what the safe defaults would be if we lack NVRAM.
Then we rename cur_XXXX to actv_XXXX (these are the currently active settings)
and the dev_XXX settings to goal_XXXX (these are the settings which we want
cur_XXXX to converge to).

Roll core minor.
2001-07-30 00:59:32 +00:00
Matt Jacob
b91862efef Firmware crashes handled in platform specific code (isp_async call).
Fix longstanding silly buglet that left a hole in the debug log defines.
2001-07-04 18:46:50 +00:00
Matt Jacob
6a23026c6e Fix botch for state levels. Role minor release. Start adding code for a
'force logout' path.

MFC after:	4 weeks
2001-06-05 17:11:06 +00:00
Matt Jacob
5d57194434 Spring MegaChange #1.
----

Make a device for each ISP- really usable only with devfs and add an ioctl
entry point (this can be used to (re)set debug levels, reset the HBA,
rescan the fabric, issue lips, etc).

----

Add in a kernel thread for Fibre Channel cards. The purpose of this
thread is to be woken up to clean up after Fibre Channel events
block things.  Basically, any FC event that casts doubt on the
location or identify of FC devices blocks the queues. When, and
if, we get the PORT DATABASE CHANGED or NAME SERVER DATABASE CHANGED
async event, we activate the kthread which will then, in full thread
context, re-evaluate the local loop and/or the fabric. When it's
satisfied that things are stable, it can then release the blocked
queues and let commands flow again.

The prior mechanism was a lazy evaluation. That is, the next command
to come down the pipe after change events would pay the full price
for re-evaluation. And if this was done off of a softcall, it really
could hang up the system.

These changes brings the FreeBSD port more in line with the Solaris,
Linux and NetBSD ports. It also, more importantly, gets us being
more proactive about topology changes which could then be reflected
upwards to CAM so that the periph driver can be informed sooner
rather than later when things arrive or depart.

---

Add in the (correct) usage of locking macros- we now have lock transition
macros which allow us to transition from holding the CAM lock (Giant)
and grabbing the softc lock and vice versa. Switch over to having this
HBA do real locking. Some folks claim this won't be a win. They're right.
But you have to start somewhere, and this will begin to teach us how
to DTRT for HBAs, etc.

--

Start putting in prototype 2300 support.  Add back in LIP
and Loop Reset as async events that each platform will handle.
Add in another int_bogus instrumentation point.

Do some more substantial target mode cleanups.

MFC after:	8 weeks
2001-05-28 21:20:43 +00:00