Commit Graph

18 Commits

Author SHA1 Message Date
Justin T. Gibbs
4164174aff aic79xx.c:
aic79xx.seq:
	Convert the COMPLETE_DMA_SCB list to an "stailq".  This allows us to
	safely keep the SCB that is currently being DMA'ed back the host on
	the head of the list while processing completions off of the bus.  The
	newly completed SCBs are appended to the tail of the queue.   In the
	past, we just dequeued the SCB that was in flight from the list, but
	this could result in a lost completion should the host perform certain
	types of error recovery that must cancel all in-flight SCB DMA operations.

	Switch from using a 16bit completion entry, holding just the tag and the
	completion valid bit, to a 64bit completion entry that also contains a
	"status packet valid" indicator.  This solves two problems:
	  o The SCB DMA engine on at least Rev B. silicon does not properly deal
	    with a PCI disconnect that occurs at a non-64bit aligned offset in the
	    chips "source buffer".  When the transfer is resumed, the DMA engine
	    continues at the correct offset, but may wrap to the head of the buffer
	    causing duplicate completions to be reported to the host.  By using a
	    completion buffer in host memory that is 64bit aligned and using 64bit
	    completion entries, such disconnects should only occur at aligned addresses.
	    This assumes that the host bridge will only disconnect on cache-line
	    boundaries and that cache-lines are multpiles of 64bits.

	  o By embedding the status information in the completion entry we can avoid
	    an extra memory reference to the HSCB for commands that complete without
	    error.

	Use the comparison of a "host freeze count" and a "sequencer freeze count"
	to allow the host to process most SCBs that complete with non-zero status
	without having to clear critical sections.  Instead the host can just pause the
	sequencer, performs any necessary cleanup in the waiting for selection list,
	increments its freeze count on the controller, and unpauses.  This is only
	possible because the sequencer defers completions of SCBs with bad status
	until after all pending selections have completed.  The sequencer then avoids
	referencing any data structures the host may touch during completion of the
	SCB until the freeze counts match.

aic79xx.c:
	Change the strategy for allocating our sentinal HSCB for the QINFIFO.  In
	the past, this allocation was tacked onto the QOUTFIFO allocation.  Now that
	the qoutfifo has grown to accomodate larger completion entries, the old
	approach will result in a 64byte allocation that costs an extra page of
	coherent memory.  We now do this extra allocation via ahd_alloc_scbs()
	where the "unused space" can be used to allocate "normal" HSCBs.

	In our packetized busfree handler, use the ENSELO bit to differentiate
	between packetized and non-packetized unexpected busfree events that
	occur just after selection, but before the sequencer has had the oportunity
	to service the selection.

	When cleaning out the waiting for selection list, use the SCSI mode
	instead of the command channel mode.  The SCB pointer in the command
	channel mode may be referenced by the SCB dma engine even while the
	sequencer is paused, whereas the SCSI mode SCB pointer is only accessed
	by the sequencer.

	Print the "complete on qfreeze" sequencer SCB completion list in
	ahd_dump_card_state().  This list holds all SCB completions that are deferred
	until a pending select-out qfreeze event has taken effect.

aic79xx.h:
	Add definitions and structures to handle the new SCB completion scheme.

	Add a controller flag that indicates if the controller is in HostRAID
	mode.

aic79xx.reg:
	Remove macros used for toggling from one data fifo mode to the other.
	They have not been in use for some time.

	Add scratch ram fields for our new qfreeze count scheme, converting
	the complete dma list into an "stailq", and providing for the "complete
	on qfreeze" SCB completion list.  Some other fields were moved to retain
	proper field alignment (alignment >= field size in bytes).

aic79xx.seq:
	Add code to our idle loop to:
	  o Process deferred completions once a qfreeze event has taken full
	    effect.
	  o Thaw the queue once the sequencer and host qfreeze counts match.

	Generate 64bit completion entries passing the SCB_SGPTR field as the
	"good status" indicator.  The first bit in this field is only set if
	we have a valid status packet to send to the host.

	Convert the COMPLETE_DMA_SCB list to an "stailq".

	When using "setjmp" to register an idle loop handler, do not combine
	the "ret" with the block move to pop the stack address in the same
	instruction.  At least on the A, this results in a return to the setjmp
	caller, not to the new address at the top of the stack.  Since we want
	the latter (we want the newly registered handler to only be invoked from
	the idle loop), we must use a separate ret instruction.

	Add a few missing critical sections.

	Close a race condition that can occur on Rev A. silicon.  If both FIFOs
	happen to be allocated before the sequencer has a chance to service the
	FIFO that was allocated first, we must take special care to service the
	FIFO that is not active on the SCSI bus first.  This guarantees that a
	FIFO will be freed to handle any snapshot requests for the FIFO that is
	still on the bus.  Chosing the incorrect FIFO will result in deadlock.

	Update comments.

aic79xx_inline.h
	Correct the offset calculation for the syncing of our qoutfifo.

	Update ahd_check_cmdcmpltqueues() for the larger completion entries.

aic79xx_pci.c:
	Attach to HostRAID controllers by default.  In the future I may add a
	sysctl to modify the behavior, but since FreeBSD does not have any
	HostRAID drivers, failing to attach just results in more email and
	bug reports for the author.

MFC After: 1week
2004-02-04 16:38:38 +00:00
Justin T. Gibbs
b3b25f2cbf ahc_eisa.c:
ahc_pci.c:
ahd_pci.c:
aic7xxx.c:
aic79xx.c:
aic_osm_lib.c:
aic_osm_lib.h:
	Use common OSM routines from aic_osm_lib for bus dma operations,
	delay routines, accessing CCBs, byte swapping, etc.

aic7xxx_pci.c:
	Provide a better description for the 2915/30LP on attach.

aic7xxx.c:
aic79xx.c:
aic7770.c:
aic79xx_pci.c:
aic7xxx_pci.c:
aic7xxx_93cx6.c:
	Move FBSDID behind an ifdef so that these core files will
	still compile under other OSes.

aic79xx.h:
aic79xx_pci.c:
aic79xx.seq:
	To speed up non-packetized CDB delivery in Rev B, all CDB
	acks are "released" to the output sync as soon as the
	command phase starts.  There is only one problem with this
	approach.  If the target changes phase before all data are
	sent, we have left over acks that can go out on the bus in
	a data phase.  Due to other chip contraints, this only
	happens if the target goes to data-in, but if the acks go
	out before we can test SDONE, we'll think that the transfer
	has completed successfully.  Work around this by taking
	advantage of the 400ns or 800ns dead time between command
	phase and the REQ of the new phase.  If the transfer has
	completed successfully, SCSIEN should fall *long* before we
	see a phase change.  We thus treat any phasemiss that
	occurs before SCSIEN falls as an incomplete transfer.

	aic79xx.h:
		Add the AHD_FAST_CDB_DELIVERY feature.

	aic79xx_pci.c:
		Set AHD_FAST_CDB_DELIVERY for all Rev. B parts.

	aic79xx.seq:
		Test for PHASEMIS in the command phase for
		all AHD_FAST_CDB_DELIVERY controlelrs.

ahd_pci.c:
ahc_pci.c:
aic7xxx.h:
aic79xx.h:
	Move definition of controller BAR offsets to core header files.

aic7xxx.c:
aic79xx.c:
	In the softc free routine, leave removal of a softc from the
	global list of softcs to the OSM (the caller of this routine).
	This allows us to avoid holding the softc list_lock during device
	destruction where we may have to sleep waiting for our recovery
	thread to halt.

ahc_pci.c:
	Use ahc_pci_test_register access to validate I/O mapped in
	addition to the tests already performed for memory mapped
	access.

	Remove unused ahc_power_state_change() function.  The PCI
	layer in both 4.X and 5.X now offer this functionality.

ahd_pci.c:
	Remove reduntant definition of controller BAR offsets.  These
	are also defined in aic79xx.h.

	Remove unused ahd_power_state_change() function.  The PCI
	layer in both 4.X and 5.X now offer this functionality.

aic7xxx.c:
aic79xx.c:
aic79xx.h:
aic7xxx.h:
aic7xxx_osm.c:
aic79xx_osm.c:
	Move timeout handling to the driver cores.  In the case
	of the aic79xx driver, the algorithm has been enhanced
	to try target resets before performing a bus reset.  For
	the aic7xxx driver, the algorithm is unchanged.  Although
	the drivers do not currently sleep during recovery (recovery
	is timeout driven), the cores do expect all processing to
	be performed via a recovery thread.  Our timeout handlers
	are now little stubs that wakeup the recovery thread.

aic79xx.c:
aic79xx.h:
aic79xx_inline.h:
	Change shared_data allocation to use a map_node so
	that the sentinel hscb can use this map node in
	ahd_swap_with_next_hscb.  This routine now swaps
	the hscb_map pointer in additon to the hscb
	contents so that any sync operations occur on
	the correct map.

	physaddr -> busaddr

	Pointed out by: Jason Thorpe <thorpej@wasabisystems.com>

aic79xx.c:
	Make more use of the in/out/w/l/q macros for accessing
	byte registers in the chip.

	Correct some issues in the ahd_flush_qoutfifo() routine.
	    o Run the qoutfifo only once the command channel
	      DMA engine has been halted.  This closes a window
	      where we might have missed some entries.
	    o Change ahd_run_data_fifo() to not loop to completion.
	      If we happen to start on the wrong FIFO and the other
	      FIFO has a snapshot savepointers, we might deadlock.
	      This required our delay between FIFO tests to be
	      moved to the ahd_flush_qoutfifo() routine.
	    o Update/add comments.
	    o Remove spurious test for COMPLETE_DMA list being empty
	      when completing transactions from the GSFIFO with
	      residuals.  The SCB must be put on the COMPLETE_DMA
	      scb list unconditionally.
	    o When halting command channel DMA activity, we must
	      disable the DMA channel in all cases but an update
	      of the QOUTFIFO.  The latter case is required so
	      that the sequencer will update its position in the
	      QOUTFIFO.  Previously, we left the channel enabled
	      for all "push" DMAs.  This left us vulnerable to
	      the sequencer handling an SCB push long after that
	      SCB was already processed manually by this routine.
	    o Correct the polarity of tests involving
	      ahd_scb_active_in_fifo().  This routine returns
	      non-zero for true.

	Return to processing bad status completions through
	the qoutfifo.  This reduces the time that the sequencer
	is kept paused when handling transactions with bad
	status or underruns.

	When waiting for the controller to quiece selections,
	add a delay to our loop.  Otherwise we may fail to wait
	long enough for the sequencer to comply.

	On H2A4 hardware, use the slow slewrate for non-paced
	transfers.  This mirrors what the Adaptec Windows
	drivers do.

	On the Rev B. only slow down the CRC timing for
	older U160 devices that might need the slower timing.
	We define "older" as devices that do not support
	packetized protocol.

	Wait up to 5000 * 5us for the SEEPROM to become unbusy.
	Write ops seem to take much longer than read ops.

aic79xx.seq:
	For controllers with the FAINT_LED bug, turn the diagnostic
	led feature on during selection and reselection.  This covers
	the non-packetized case.  The LED will be disabled for
	non-packetized transfers once we return to the top level idle
	loop.  Add more comments about the busy LED workaround.

	Extend a critical section around the entire
	command channel idle loop process.  Previously
	the portion of this handler that directly manipulated
	the linked list of completed SCBs was not protected.
	This is the likely cause of the recent reports of
	commands being completed twice by the driver.

	Extend critical sections across the test for,
	and the longjump to, longjump routines.  This
	prevents the firmware from trying to jump to
	a longjmp handler that was just cleared by the
	host.

	Improve the locations of several critical section
	begin and end points.  Typically these changes
	remove instructions that did not need to be
	inside a critical section.

	Close the "busfree after selection, but before busfree
	interrupts can be enabled" race to just a single sequencer
	instruction.  We now test the BSY line explicitly before
	clearing the busfree status and enabling the busfree
	interrupt.

	Close a race condition in the processing of HS_MAILBOX
	updates.  We now clear the "updated" status before the
	copy.  This ensures that we don't accidentally clear
	the status incorrectly when the host sneaks in an update
	just after our last copy, but before we clear the status.
	This race has never been observed.

	Don't re-enable SCSIEN if we lose the race to disable SCSIEN
	in our interrupt handler's workaround for the RevA data-valid
	too early issue.

aic79xx_inline.h:
	Add comments indicating that the order in which bytes are
	read or written in ahd_inw and ahd_outw is important.  This
	allows us to use these inlines when accessing registers with
	side-effects.

aic79xx_pci.c:
	The 29320 and the 29320B are 7902 not 7901 based products.
	Correct the driver banner.

aic7xxx.h:
	Enable the use of the auto-access pause feature
	on the aic7870 and aic7880.  It was disabled due
	to an oversight.

aic7xxx.reg:
	Move TARG_IMMEDIATE_SCB to alias LAST_MSG to
	avoid leaving garbage in MWI_RESIDUAL.  This
	prevents spurious overflows whn operating target
	mode on controllers that require the MWI_RESIDUAL
	work-around.

aic7xxx.seq:
	AHC_TMODE_WIDEODD_BUG is a bug, not a softc flag.
	Reference the correct softc field when testing
	for its presence.

	Set the NOT_IDENTIFIED and NO_CDB_SENT bits
	in SEQ_FLAGS to indicate that the nexus is
	invalid in await busfree.

aic7xxx_93cx6.c:
	Add support for the C56/C66 versions of the EWEN and EWDS
	commands.

aic7xxx.c:
aic7xxx_pci.c:
	Move test for the validity of left over BIOS data
	to ahc_test_register_access().  This guarantees that
	any left over CHIPRST value is not clobbered by our
	register access test and lost to the test that was
	in ahc_reset.
2003-12-17 00:02:10 +00:00
John Baldwin
e27951b29c Use PCIR_BAR(x) instead of PCIR_MAPS.
Glanced over by:	imp, gibbs
Tested by:		i386 LINT
2003-09-02 17:30:40 +00:00
Justin T. Gibbs
4294c2dc56 aic79xx.h:
Add softc flag to indicate that we have seen at
	least one selection since the last bus reset or
	SE/LVD bus change.

aic79xx.c:
	Fix a few style nits.

	In ahd_update_pending_scbs(), only touch card registers
	once we have found an SCB that needs to be updated.
	This removes lots of clutter from PCI traces taken of
	error recovery performed by the driver.

	Short circuit the first selection iocell workaround handler
	if we've run once since the last bus reset or iocell change.
	This also removes clutter from PCI traces.

	Note if completions are pending in the qoutfifo when we dump
	card state.
2003-06-28 04:45:25 +00:00
Justin T. Gibbs
c8ee71777e aic79xx.h:
Add a 7901A specific feature definition.

aic79xx_pci.c:
	Split out the general aic790X setup into it's own
	setup handler that works on single and dual controllers.
	Adjust all other PCI setup handlers to initialize the
	chips basic features and type before calling the generic
	handler.

	Turn off a few Rev B workarounds that are not required
	on the 7901B.
2003-06-28 04:39:49 +00:00
Justin T. Gibbs
1d528d6792 aic7770.c:
aic79xx.c:
aic79xx.h:
aic79xx_pci.c:
aic7xxx.c:
aic7xxx.h:
aic7xxx_pci.c:
	Switch ah?_reset() to take an additional "reinit" argument.
	Use this instead of init_level to determin if the chip
	should be fully reinitialized after a chip reset.  This
	is required so that ah?_shutdown() can reset the chip
	without side-effects.

aic79xx.c:
	Implement ahd_suspend() and ahd_resume().

aic7xxx.c:
	Change ahc_loadseq() to *not* restart the sequencer.
	This brings the loadseq behavior in line with that
	of the 7902 driver and also simplifies the init routine.

	Correct the resume routine to enable interrupts and
	restart the sequencer.
2003-06-06 23:48:19 +00:00
Scott Long
6ee007e145 Fix a reported case of severe data corruption:
aic79xx.h:
aic79xx.reg:
	Return the SCB_TAG field to 16byte alignment.
	It seems that on some PCI systems, SCBs are not
	transferred correctly to the controller with
	the previous placement of the SCB_TAG field.

Approved by:	re (rwatson)
2003-05-30 02:14:22 +00:00
Justin T. Gibbs
8089f0f033 Fixup spelling of "coalesce" and derivatives.
Approved by: RE
2003-05-26 21:10:58 +00:00
Justin T. Gibbs
d7cff4ab97 Correct spelling errors.
Switch to handling bad SCSI status as a sequencer interrupt
instead of having the kernel proccess these failures via
the completion queue.  This is done because:

 o The old scheme required us to pause the sequencer and clear
   critical sections for each SCB.  It seems that these pause
   actions, if coincident with a sequencer FIFO interrupt, would
   result in a FIFO interrupt getting lost or directing to the
   wrong FIFO.  This caused hangs when the driver was stressed
   under high "queue full" loads.
 o The completion code assumed that it was always called with
   the sequencer running.  This may not be the case in timeout
   processing where completions occur manually via
   ahd_pause_and_flushwork().
 o With this scheme, the extra expense of clearing critical
   sections is avoided since the sequencer will only self pause
   once all pending selections have cleared and it is not in
   a critical section.

  aic79xx.c
	Add code to handle the new BAD_SCB_STATUS sequencer
	interrupt code.  This just redirects the SCB through
	the already existing ahd_complete_scb() code path.
	Remove code in ahd_handle_scsi_status() that paused
	the sequencer, made sure that no selections where
	pending, and cleared critical sections.  Bad
	status SCBs are now only processed when all of these
	conditions are true.

  aic79xx.reg:
	Add the BAD_SCB_STATUS sequencer interrupt code.

  aic79xx.seq:
	When completing an SCB upload to the host, if
	we are doing this because the SCB contains non-zero
	SCSI status, defer completing the SCB until there
	are no pending selection events.  When completing
	these SCBs, use the new BAD_SCB_STATUS sequencer
	interrupt.  For all other uploaded SCBs (currently
	only for underruns), the SCB is completed via the
	normal done queue.  Additionally, keep the SCB that
	is currently being uploaded on the COMPLETE_DMA_SCB
	list until the dma is completed, not just until the
	DMA is started.  This ensures that the DMA is restarted
	properly should the host disable the DMA transfer for
	some reason.

	In our RevA workaround for Maxtor drives, guard against
	the host pausing us while trying to pause I/O until the
	first data-valid REQ by clearing the current snapshot
	so that we can tell if the transfer has completed prior
	to us noticing the REQINIT status.

	In cfg4data_intr, shave off an instruction before getting
	the data path running by adding an entrypoint to the
	overrun handler to also increment the FIFO use count.

	In the overrun handler, be sure to clear our LONGJMP
	address in both exit paths.

Perform a few sequencer optimizations.

  aic79xx.c:
	Print the full path from the SCB when a packetized
	status overrun occurs.

	Remove references to LONGJMP_SCB which is being
	removed from firmware usage.

	Print the new SCB_FIFO_USE_COUNT field in the
	per-SCB section of ahd_dump_card_state().  The
	SCB_TAG field is now re-used by the sequencer,
	so it no longer makes sense to reference this
	field in the kernel driver.

  aic79xx.h:
	Re-arrange fields in the hardware SCB from largest
	size type to smallest.  This makes it easier to
	move fields without changing field alignment.

	The hardware scb tag field is now down near the
	"spare" portion of the SCB to facilitate reuse
	by the sequencer.

  aic79xx.reg:
	Remove LONGJMP_ADDR.

	Rearrange SCB fields to match aic79xx.h.
	Add SCB_FIFO_USE_COUNT as the first byte
	of the SCB_TAG field.

  aic79xx.seq:
	Add a per-SCB "Fifos in use count" field and use
	it to determine when it is safe (all data posted)
	to deliver status back to the host.  The old method
	involved polling one or both FIFOs to verify that
	the current task did not have pending data.  This
	makes running down the GSFIFO very cheap, so we
	will empty the GSFIFO in one idle loop pass in
	all cases.

	Use this simplification of the completion process
	to prune down the data FIFO teardown sequencer for
	packetized transfers.  Much more code is now shared
	between the data residual and transfer complete cases.

	Correct some issues in the packetized status handler.
	It used to be possible to CLRCHN our FIFO before status
	had fully transferred to the host.  We also failed to
	handle NONPACKREQ phases that could occur should a CRC
	error occur during transmission of the status data packet.

Correct a few big endian issues:

  aic79xx.c:
  aic79xx_inline.h:
  aic79xx_pci.c:
  aic79xx_osm.c:
	o Always get the SCB's tag via the SCB_GET_TAG acccessor
	o Add missing use of byte swapping macros when touching
	  hscb fields.
	o Don't double swap SEEPROM data when it is printed.
	  Correct a big-endian bug.  We cannot assign a
	o When assigning a 32bit LE variable to a 64bit LE
	  variable, we must be explict about how the words
	  of the 64bit LE variable are initialized.  Cast to
	  (uint32_t*) to do this.

aic79xx.c:
	In ahd_clear_critical_section(), hit CRLSCSIINT
	after restoring the interrupt masks to avoid what
	appears to be a glitch on SCSIINT.  Any real SCSIINT
	status will be persistent and will immidiately
	reset SCSIINT.  This clear should only get rid of
	spurious SCSIINTs.

	This glitch was the cause of the "Unexpected PKT busfree"
	status that occurred under high queue full loads

	Call ahd_fini_scbdata() after shutdown so that
	any ahd_chip_init() routine that might access
	SCB data will not access free'd memory.

	Reset the bus on an IOERR since the chip doesn't
	seem to reset to the new voltage level without
	this.

	Change offset calculation for scatter gather maps
	so that the calculation is correct if an integral
	multiple of sg lists does not fit in the allocation
	size.

	Adjust bus dma tag for data buffers based on 39BIT
	addressing flag in our softc.

	Use the QFREEZE count to simplify ahd_pause_and_flushworkd().
	We can thus rely on the sequencer eventually clearing ENSELO.

	In ahd_abort_scbs(), fix a bug that could potentially
	corrupt sequencer state.  The saved SCB was being
	restored in the SCSI mode instead of the saved mode.
	It turns out that the SCB did not need to be saved at all
	as the scbptr is already restored by all subroutines
	called during this function that modify that register.

aic79xx.c:
aic79xx.h:
aic79xx_pci.c:
	Add support for parsing the seeprom vital product
	data.  The VPD data are currently unused.

aic79xx.h:
aic79xx.seq:
aic79xx_pci.c:
	Add a firmware workaround to make the LED blink
	brighter during packetized operations on the H2A.

aic79xx_inline.h:
	The host does not use timer interrupts, so don't
	gate our decision on whether or not to unpause
	the sequencer on whether or not a timer interrupt
	is pending.
2003-05-04 00:20:07 +00:00
Justin T. Gibbs
2cd3cc377a aic79xx.c:
Include read streaming in the PPR flags we display in diagnostics.

	In ahd_reset(), set the known mode after our initial pause prior to
	setting the mode. We can't just set the mode directly because the
	current mode, after the pause, is most likely unknown and setting the
	mode when the saved mode is unknown will trigger an assertion in
	the mode debug code.

	Complete an audit for SCB RAM reads.  These reads must be performed
	via the special ahd_in?_scbram() methods so we can perform a
	Rev A. PCI-X workaround.

	Remove a superfluous mode save operation that was performed just
	prior to a call to ahd_clear_critical_section().  The saved mode
	was never restored and wouldn't have been valid anyway since the
	mode could change while single stepping out of a critical section.

aic79xx.h:
	Add new BUG definition AHD_PCIX_SCBRAM_RD_BUG.

aic79xx_inline.h:
	Update ahd_inb_scbram routine to check for AHD_PCIX_SCBRAM_RD_BUG
	and only apply the workaround if this bug is active.  The old code
	applied the workaround in all cases.

aic79xx_pci.c:
	Set AHD_PCIX_SCBRAM_RD_BUG for the A4.

	Remove an attempted saved_modes call in ahd_pci_test_register_access().
	Saving the modes can only occur when we are paused, but the call was
	happening before the chip was known to be paused.  Restoring the
	modes doesn't make sense either since the code makes no assumptions
	about the state of the sequencer until the first time the mode is set
	by the driver.  This happens after the registers are successfully
	mapped.
2003-03-06 23:58:34 +00:00
Justin T. Gibbs
acae33b029 aic79xx.c:
Clear the LQICRC_NLQ status should it pop up after we have
	already handled the SCSIPERR.  During some streaming operations
	this status can be delayed until the stream ends.  Without this
	change, the driver would complain about a "Missing case in
	ahd_handle_scsiint".

	In the LQOBUSFREE handler...

		Don't return the LQOMGR back to the idle state until after
		we have cleaned up ENSELO and any status related to this
		selection.  The last thing we need is the LQO manager starting
		another select-out before we have updated the execution queue.
		It is not clear whether the LQOMGR would, or would not
		start a new selection early.

		Make sure ENSELO is off prior to clearing SELDO by flushing
		device writes.

		Move assignment of the next target SCB pointer inside of
		an if to make the code clearer.  The effect is the same.

	Dump card state in both "Unexpected PKT busfree" paths.

	In ahd_reset(), set the chip to SCSI mode before reading SXFRCTL1.
	That register only exists in the SCSI mode.  Also set the mode
	explicitly to the SCSI mode after chip reset due to paranoia.
	Re-arrange code so that SXFRCTL1 is restored as quickly after the
	chip reset as possible.

	S/G structurs must be 8byte aligned.  Make this official by saying
	so in our DMA tag.

	Disable CIO bus stretch on MDFFSTAT if SHVALID is about to come
	true.  This can cause a CIO bus lockup if a PCI or PCI-X error
	occurs while the stretch is occurring - the host cannot service
	the PCI-X error since the CIO bus is locked out and SHVALID will
	never resolve.  The stretch was added in the Rev B to simplify the
	wait for SHVALID to resolve, but the code to do this in the open
	source sequencer is so simple it was never removed.

	Consistently use MAX_OFFSET for the user max syncrate set from
	non-volatile storage.  This ensures that the offset does not
	conflict with AH?_OFFSET_UNKNOWN.

	Have ahd_pause_and_flushwork set the mode to ensure that it has
	access to the registers it checks.  Also modify the checking of
	intstat so that the check against 0xFF can actually succeed if
	the INT_PEND mask is something other than 0xFF.  Although there
	are no cardbus U320 controllers, this check may be needed to
	recover from a hot-plug PCI removal that occurs without informing
	the driver.

	Fix a typo.  sg_prefetch_cnt -> sg_prefetch_align.  This fixes
	an infinite loop at card initialization if the cacheline size is 0.

aic79xx.h:
	Add AHD_EARLY_REQ_BUG bug flag.

	Fix spelling errors.

	Include the CDB's length just after the CDB pointer in the DMA'ed
	CDB case.

	Change AH?_OFFSET_UNKNOWN to 0xFF.  This is a value that the
	curr->offset can never be, unlike '0' which we previously used.
	This fixes code that only checks for a non-zero offset to
	determine if a sync negotiation is required since it will fire
	in the unknown case even if the goal is async.

aic79xx.reg:
	Add comments for LQISTAT bits indicating their names in the 7902
	data book.  We use slightly different and more descriptive names
	in the firmware.

	Fix spelling errors.

	Include the CDB's length just after the CDB pointer in the DMA'ed
	CDB case.

aic79xx.seq:
	Update comments regarding rundown of the GSFIFO to reflect reality.

	Fix spelling errors.

	Since we use an 8byte address and 1 byte length, shorten the size
	of a block move for the legacy DMA'ed CDB case from 11 to 9 bytes.

	Remove code that, assuming the abort pending feature worked, would
	set MK_MESSAGE in the SCB's control byte on completion to catch
	invalid reselections.  Since we don't see interrupts for completed
	selections, this status update could occur prior to us noticing the
	SELDO.  The "select-out" queue logic will get confused by the
	MK_MESSAGE bit being set as this is used to catch packatized
	connections where we select-out with ATN.  Since the abort pending
	feature doesn't work on any released controllers yet, this code was
	never executed.

	Add support for the AHD_EARLY_REQ_BUG.  Don't ignore persistent REQ
	assertions just because they were asserted within the bus settle delay
	window.  This allows us to tolerate devices like the GEM318 that
	violate the SCSI spec.

	Remove unintentional settnig of SG_CACHE_AVAIL.  Writing this bit
	should have no effect, but who knows...

	On the Rev A, we must wait for HDMAENACK before loading additional
	segments to avoid clobbering the address of the first segment in
	the S/G FIFO.  This resolves data-corruption issues with certain
	IBM (now Hitachi) and Fujitsu U320 drives.

	Rearrange calc_residual to avoid an extra jmp instruction.

	On RevA Silicon, if the target returns us to data-out after we
	have already trained for data-out, it is possible for us to
	transition the free running clock to data-valid before the required
	100ns P1 setup time (8 P1 assertions in fast-160 mode).  This will
	only happen if this L-Q is a continuation of a data transfer for
	which we have already prefetched data into our FIFO (LQ/Data
	followed by LQ/Data for the same write transaction).  This can
	cause some target implementations to miss the first few data
	transfers on the bus.  We detect this situation by noticing that
	this is the first data transfer after an LQ (LQIWORKONLQ true),
	that the data transfer is a continuation of a transfer already
	setup in our FIFO (SAVEPTRS interrupt), and that the transaction
	is a write (DIRECTION set in DFCNTRL). The delay is performed by
	disabling SCSIEN until we see the first REQ from the target.

	Only compile in snapshot savepointers handler for RevA silicon
	where it is enabled.

	Handle the cfg4icmd packetized interrupt.  We just need to load
	the address and count, start the DMA, and CLRCHN once the transfer
	is complete.

	Fix an oversight in the overrun handler for packetized status
	operations.  We need to wait for either CTXTDONE or an overrun
	when checking for an overrun.  The previous code did not wait
	and thus could decide that no overrun had occurred even though
	an overrun will occur on the next data-valid req.  Add some
	comment to this section for clarity.

	Use LAST_SEG_DONE instead of LASTSDONE for testing transfer
	completion in the packetized status case.  LASTSDONE may come up
	more quickly since it only records completion on the SCSI side,
	but since LAST_SEG_DONE is used everywhere else (and needs to be),
	this is less confusing.

	Add a missing invalidation of the longjmp address in the non-pack
	handler.  This code needs additional review.

aic79xx_inline.h:
	Fix spelling error.

aic79xx_osm.c:
	Set the cdb length for CDBs dma'ed from host memory.

	Add a comment indicating that, should CAM start supporting cdbs
	larger than 16bytes, the driver could store the CDB in the status
	buffer.

aic79xx_pci.c:
	Add a table entry for the 39320A.

	Added a missing comma to an error string table.

	Fix spelling errors.
2003-02-27 23:23:16 +00:00
Justin T. Gibbs
0794987d01 aic79xx.c:
Implement the SCB_SILENT flag.  This is useful for
	hushing up the driver during DV or other operations
	that we expect to cause transmission errors.  The
	messages will still print if the SHOW_MASKED_ERRORS
	debug option is enabled.

	Save and restore the NEGOADDR address when setting
	new transfer settings.  The sequencer performs lookups
	in the negotiation table too and it expects NEGOADDR
	to remain consistent across pause/unpause sessions.

	Consistently use "offset" instead of "period" to determine
	if we are running sync or not.

	Add a SHOW_MESSAGES diagnostic for when we assert ATN
	during message processing.

	Print out IU, QAS, and RTI features when showing transfer options.

	Limit the syncrate after all option conformance
	changes have taken place in ahd_devlimited_syncrate.
	Changes in options may change the final syncrate we
	accept.

	Keep a copy of the hs_mailbox in our softc so that
	we can perform read/modify/write operations on the
	hs_mailbox without having to pause the sequencer to
	read the last written value.  Use the ENINT_COALESS
	flag in the hs_mailbox to toggle interrupt coalessing.

	Add entrypoints for enabling interrupt coalessing and
	setting both a timeout (how long to wait for commands
	to be coalessed) and a maximum commands to coaless value.
	Add a statistics timer that decides when to enable or
	disable interrupt coalessing based on load.

	Add a routine, ahd_reset_cmds_pending() which is used
	to update the CMDS_PENDING sequencer variable whenever
	error recovery compeltes SCBs without notifying the
	sequencer.  Since ahd_reset_cmds_pending is called
	during ahd_unpause() only if we've aborted SCBs, its
	call to ahd_flush_qoutfifo should not cause recursion
	through ahd_run_qoutfifo().  A panic has been added to
	ensure that this recursion does not occur.

	In ahd_search_qinfifo, update the CMDS_PENDING sequencer
	variable directly.  ahd_search_qinififo can be called
	in situations where using ahd_reset_cmds_pending() might
	cause recursion.  Since we can safely determine the
	exact number to reduce CMDS_PENDING by in this scenario
	without running the qoutfifo, the manual update is sufficient.

	Clean up diagnostics.
	Add ahd_flush_qoutfifo() which will run the qoutfifo
	as well as complete any commands sitting on the
	sequencer's COMPLETE_SCB lists or the good status FIFO.
	Use this routine in several places that did similar
	things in an add-hoc, but incomplete, fashion.  A call
	to this routine was also added to ahd_abort_scbs() to
	close a race.

	In ahd_pause_and_flushwork() only return once selections
	are safely disabled.  Flush all completed commands via
	ahd_flush_qoutfifo().

	Remove "Now packetized" diagnostic now that this
	information is incorperated into the actual negotiation
	messages that are displayed.

	When forcing renegotiation, don't clober the current
	ppr_options.  Much of the driver uses this information
	to determine if we are currently packetized or not.

	Remove some stray spaces at column 1 in ahd_set_tags.

	When complaining about getting a host message loop
	request with no pending messages, print out the
	SCB_CONTROL register down on the card.

	Modify the ahd_sent_msg() routine to handle a search
	for an outgoing identify message.  Use this to detect
	a msg reject on an identify message which typically
	indicates that the target thought we were packetized.
	Force a renegotiation in this case.

	In ahd_search_qinfifo(), wait more effectively for SCB
	DMA activities to cease.  We also disable SCB fetch
	operations since we are about to change the qinfifo
	and any fetch in progress will likely be invalidated.

	In ahd_qinfifo_count(), fix the qinfifo empty case.

	In ahd_dump_card_state(), print out CCSCBCTL in the
	correct mode.

	If we are a narrow controller, don't set the current
	width to unknown when forcing a future negotiation.
	This just confuses the code into attempting a wide
	negotiation on a narrow bus.

	Add support for task management function completions.

	Modify ahd_handle_devreset so that it can handle
	lun resets in addition to target resets.  Use
	ahd_handle_devreset for lun and target reset task
	management functions.

	Handle the abort task TMF race case better.  We now
	wait until any current selections are over and then
	set the TMF back to zero.  This should cause the sequencer
	to ignore the abort TMF completion should it occur.

	Correct a bug in the illegal phase handler that
	caused us to drop down to narrow when handling the
	unexpected command phase case after 3rd party
	reset of a packetized device.

	Indicate the features, bugs, and flags set in the softc
	that are used to control firmware patch download when
        booting verbose.

aic79xx.h:
	Add coalessing and HS_MAILBOX fields.

	Add per-softc variables for the stats "daemon".

	Add a debug option for interrupt coalessing activities.

	Add two new softc flags:
	o AHD_UPDATE_PEND_CMDS
	  Run ahd_reset_cmds_pending() on the next unpause.

	o AHD_RUNNING_QOUTFIFO
	  Used to catch recursion through ahd_run_qoutfifo().

aic79xx.reg:
	Correct register addresses related to the software timer
	and the DFDBCTL register.

	Add constants paramaterizing the software timer.

	Add scratch ram locations for storing interrupt coalessing
	tunables.

	Break INTMASK in SEQITNCTL out into INTMASK1 and INTMASK2.
	In at least the REV A, these are writable bits.  We make
	use of that for a swtimer workaround in the sequencer.

	Since HS_MAILBOX autoclears, provide a sequencer variable
	to store its contents.

	Add SEQINT codes for handling task management completions.

aic79xx.seq:
	Correct ignore wide residue processing check for
	a wide negotiation being in effect.  We must be
	in the SCSI register window in order to access the
	negotiation table.

	Use the software timer and a commands completed count to
	implement interrupt coalessing.  The command complete is
	deferred until either the maximum command threshold or a
	the expiration of a command deferral timer.  If we have
	more SCBs to complete to the host (sitting in COMPLETE_SCB
	lists), always try to coaless them up to our coalessing limit.
	If coalessing is enabled, but we have fewer commands oustanting
	than the host's min coalessing limit, complete the command
	immediately.

	Add code to track the number of commands outstanding.
	Commands are outstanding from the time they are placed
	into the execution queue until the DMA to post completion
	is setup.

	Add a workaround for intvec_2 interrupts on the H2A4.
	In H2A4, the mode pointer is not saved for intvec2, but
	is restored on iret.  This can lead to the restoration
	of a bogus mode ptr.  Manually clear the intmask bits and
	do a normal return to compensate.  We use intvec_2 to
	track interrupt coalessing timeouts.

	Since we cannot disable the swtimer's countdown, simply
	mask its interrupt once we no longer care about it firing.

	In idle_loop_cchan, update LOCAL_HS_MAILBOX everytime
	we are notified of an HS_MAILBOX update via the
	HS_MAILBOX_ACT bit in QOFF_CTLSTA.  We have to use a
	local copy of persistant portions of the HS_MAILBOX as
	the mailbox auto-clears on any read.

	Move the test for the cfg4istat interrupt up an instruction
	to hopefully close a race between the next outgoing selection
	and our disabling of selections.

	Add a missing ret to the last instruction in load_overrun_buf.

	Add notifications to the host of task management
	completions as well as the completions for commands
	that completed successfully before their corresponding
	TMF could be sent.

	Hold a critical section during select-out processing
	until we have a fully identified connection.  This
	removes a race condition with the legacy abort handler.

	Correct a few spelling errors in some comments.

aic79xx_inline.h:
	Call ahd_reset_cmds_pending() in ahd_unpause if required.

	Update cmdcmplt interrupt statistics in our interrupt
	handler.

	Allow callers to ahd_send_scb() to set the task management
	function.

aic79xx_pci.c:
	Disable SERR and pause the controller prior to performing
	our mmapped I/O test.  The U320 controllers do not support
	"auto-access-pause".

aic79xx_osm.c:
	Set the task management function now that
	ahd_send_scb() doesn't do it for us.  We
	also perform a lun reset in response to BDR
	requests to packetized devices.
2003-01-20 20:17:35 +00:00
Scott Long
0c5aa4c57b Major update to the ahd driver to fix many bugs found in the previous
version, plus add support for the new features found in the Rev B
version of the chip.  The changelog is quite long and can be provided
on request.  Major features include vastly improved protocol violation
handling, full support for the 7902 Rev B, better parity error
handling, and better packetized overrun handling, to name a few.

Approved by:	re (blanket)
2002-12-01 08:13:37 +00:00
Justin T. Gibbs
c59c8a72cf Upgrade to version 1.1 of the aic79xx U320 driver.
aic79xx.c:
	o Remove redundant ahd_update_modes() call.
	o Correct panic in diagnostic should state corruption cause
	  the SCB Id to be invalid during a selection timeout.
	o Add workaround for missing BUSFREEREV feature in Rev A silicon.
	o Corect formatting nits.
	o Use register pretty printing in more places.
	o Save and restore our SCB pointer when updating the waiting queue
	  list for an "expected" LQ-out busfree.
	o In ahd_clear_intstat, deal with the missing autoclear in the
	  CLRLQO* registers.
	o BE fixup in a diagnostic printf.
	o Make sure that we are in the proper mode before disabling
	  selections in ahd_update_pending_scbs.
	o Add more diagnostics.
	o task_attribute_nonpkt_tag -> task_attribute: we don't need a
	  nonpkt_tag field anymore for allowing all 512 SCBs to be
	  used in non-packetized connections.
	o Negotiate HOLD_MCS to U320 devices.
	o Add a few additional mode assertions.
	o Restore the chip mode after clearing out the qinfifo so that
	  code using ahd_abort_scbs sees a consistent mode.
	o Simplify the DMA engine shutdown routine prior to performing
	  a bus reset.
	o Perform the sequencer restart after a chip reset prior to
	  setting up our timer to poll for the reset to be complete.
	  On some OSes, the timer could actually pre-empt us and order
	  is important here.
	o Have our "reset poller" set the expected mode since there is
	  no guarantee of what mode will be in force when we are called
	  from the OS timer.
	o Save and restore the SCB pointer in ahd_dump_card_state().  This
	  routine must not modify card state.
	o Ditto for ahd_dump_scbs().

aic79xx.h:
	o Add a few more chip bug definitions.
	o Align our tag on a 32bit boundary.

aic79xx.reg:
aic79xx.seq:
	o Start work on removing workarounds for Rev B.
	o Use a special location in scratch from for stroring
	  our SCBPTR during legacy FIFO allocations.  This corrects
	  problems in mixed packetized/non-packetized configurations
	  where calling into a FIFO task corrupted our SCBPTR.
	o Don't rely on DMA priority to guarantee that all data in
	  our FIFOs will flush prior to a command completion notification
	  going out of the command channel.  We've never seen this assumption
	  fail, but better safe than sorry.
	o Deal with missing BUSFREEREV feature in H2A.
	o Simplify disconnect list code now that the list will always
	  have only a single entry.
	o Implement the AHD_REG_SLOW_SETTLE_BUG workaround.
	o Swith to using "REG_ISR" for local mode scratch during
	  our ISR.
	o Add a missing jmp to the data_group_dma_loop after our
	  data pointers have been re-initialized by the kernel.
	o Correct test in the bitbucket code so that we actually
	  wait for the bitbucket to complete before signaling the
	  kernel of the overrun condition.
	o Reposition pkt_saveptrs to avoid a jmp instruction.
	o Update a comment to reflect that the code now waits for
	  a FIFO to drain prior to issuing a CLRCHN.

aic79xx_inline.h:
	o Remove unused untagged queue handling code.
	o Don't attempt to htole64 what could be a 32bit value.

aic79xx_pci.c:
	o Set additional bug flags for rev A chips.
2002-09-26 22:54:00 +00:00
Scott Long
7a55322993 Use the correct bit value for a debug options 2002-09-01 07:14:26 +00:00
Justin T. Gibbs
544c53b8be Updates for new non-packetized SCB-ID collision avoidance,
busy target table addressing changes, our qoufifo scheme,
and long lun support.

Drop bus reset hold delay to 25us.

Remove chip workarounds for revisions that never went to
production.

Add aic7901A identification information.

Remove untagged queue logic.
2002-08-31 06:48:42 +00:00
Justin T. Gibbs
cdd49e97b4 Hook up the ahd driver. 2002-06-06 16:35:58 +00:00
Justin T. Gibbs
17d2475554 Enter the ahd driver which supports the Adaptec AIC7902 Ultra320, PCI-X
SCSI Controller chip.
2002-06-05 19:52:45 +00:00