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History log of /src/sys/dev/ic/aic79xx.c
RevisionDateAuthorComments
 1.70  02-Feb-2024  andvar fix various typos in comments.
 1.69  01-Aug-2023  andvar s/diable/disable/ in comments.
 1.68  23-May-2022  andvar s/boundries/boundaries/, s/itterate/iterate/ and few more typos.
 1.67  22-May-2022  andvar fix various small typos, mainly in comments.
 1.66  16-Apr-2022  andvar s/strickly/strictly/
 1.65  07-Apr-2022  andvar fix various typos in comments.
 1.64  08-Mar-2022  andvar fix few typos in comments.
 1.63  05-Dec-2021  msaitoh Fix typo again... s/Expilcitly/Explicitly/
 1.62  05-Dec-2021  msaitoh s/runable/runnable/
 1.61  05-Dec-2021  msaitoh s/programatic/programmatic/ in comment.
 1.60  05-Dec-2021  msaitoh s/explcit/expilcit/ in comment.
 1.59  25-Oct-2021  ryo fix "error: stack usage might be unbounded [-Werror=stack-usage=]" with COPTS=-O0
 1.58  16-Sep-2021  andvar fix typos in word "successful".
 1.57  24-Jul-2021  andvar Fix all remaining typos, mainly in comments but also in few definitions and log messages, reported by me in PR kern/54889.
Also fixed some additional typos in comments, found on review of same files or typos.
 1.56  27-Jun-2020  jdolecek branches: 1.56.6;
constify, NFCI
 1.55  27-Jun-2020  jdolecek small constify
 1.54  27-Jun-2020  jdolecek mark ahc_loadseq()/ahd_loadseq() as __noinline to avoid 'stack usage
might get unbounded' - seems the variable-length array using const variable
is misinterpreted as unbounded when inlined
 1.53  27-Dec-2019  msaitoh s/sucess/success/ in comment.
 1.52  10-Nov-2019  chs in many device attach paths, allocate memory with M_WAITOK instead of M_NOWAIT
and remove code to handle failures that can no longer happen.
 1.51  04-Feb-2019  mrg add or adjust fallthru comments.
 1.50  18-Oct-2014  snj branches: 1.50.20;
src is too big these days to tolerate superfluous apostrophes. It's
"its", people!
 1.49  17-Apr-2014  christos put back missing arg
 1.48  17-Apr-2014  christos CID/1203192, CID/1203193: Out of bounds read
 1.47  27-Mar-2014  christos branches: 1.47.2;
cleanup debugging printfs to avoid overflow
 1.46  17-Oct-2013  christos - remove unused variables
- move variables inside ifdef sections
- ifdef notdef unused code
- use __USE for debugging variables
 1.45  02-Jul-2011  mrg branches: 1.45.2; 1.45.12; 1.45.16;
avoid -Wenum-compare issue.
 1.44  03-Sep-2009  tsutsui - wrap long lines
- remove unnecessary casts against void pointers
 1.43  02-Sep-2009  tsutsui TAB vs space cleanup.
 1.42  02-Sep-2009  tsutsui Replace shutdownhook_establish(9) with pmf_device_register1(9).
Untested, but mostly copied from ahc(4).

This may fix reboot failure problem on ahd(4) after pmf(9) merge:
http://mail-index.NetBSD.org/current-users/2007/12/10/0008.html
which was also seen on old ahc(4):
http://mail-index.NetBSD.org/port-sgimips/2008/01/05/msg000003.html
 1.41  18-Mar-2009  cegger bzero -> memset
 1.40  14-Mar-2009  dsl ANSIfy another 1261 function definitions.
The only ones left in sys are beyond by sed script!
(or in sys/dist or sys/external)
Mostly they have function pointer parameters.
 1.39  14-Mar-2009  dsl Change about 4500 of the K&R function definitions to ANSI ones.
There are still about 1600 left, but they have ',' or /* ... */
in the actual variable definitions - which my awk script doesn't handle.
There are also many that need () -> (void).
(The script does handle misordered arguments.)
 1.38  21-Mar-2008  dyoung branches: 1.38.4; 1.38.10; 1.38.12; 1.38.18;
Use aprint_*_dev(), and device_xname(). Constify a bit.
 1.37  04-Mar-2007  christos branches: 1.37.16; 1.37.32; 1.37.36;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.
 1.36  16-Nov-2006  christos branches: 1.36.4;
__unused removal on arguments; approved by core.
 1.35  12-Oct-2006  christos - sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386
 1.34  08-Mar-2006  lukem branches: 1.34.10; 1.34.12;
Use the SI capitalization for "Hz", "kHz", and "MHz" in comments and strings.
Add a space between numbers and Hz unit.
 1.33  24-Dec-2005  perry branches: 1.33.4; 1.33.6; 1.33.8; 1.33.10;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.
 1.32  28-Nov-2005  bouyer Don't call alloc_scb() (which can call bus_dmamem_alloc/map) from
ADAPTER_REQ_RUN_XFER context (which can be interrupt context), defer this
to the ADAPTER_REQ_GROW_RESOURCES callback.
Fix a panic in uvm reported by John R. Shannon on port-xen; patch tested on
ahc by me and on ahd by John.
 1.31  30-May-2005  christos branches: 1.31.2; 1.31.8;
- add missing const
- fix variable shadowing
- remove unneeded casts
 1.30  27-Feb-2005  perry branches: 1.30.2;
nuke trailing whitespace
 1.29  21-Feb-2005  thorpej Part 1 of a cleanup pass over the SCSI subsystem. The aim is to name
everything "scsi_*", since we really are talking about the SCSI command
set, ATAPI transport not withstanding. Improve the names of many structures,
and prepend "SCSI_" onto all SCSI command opcodes. Place items described
by the SCSI Primary Commands document into scsi_spc.h.
 1.28  21-Apr-2004  itojun branches: 1.28.4; 1.28.6;
avoid unbounded sprintf(), use snprintf()
 1.27  13-Feb-2004  wiz branches: 1.27.2; 1.27.4; 1.27.6;
Uppercase CPU, plural is CPUs.
 1.26  02-Nov-2003  wiz Fix some typos. From Tom Cosgrove via jmc@openbsd.
 1.25  10-Oct-2003  fvdl Don't zap the lower 16 bits of the command/status register when clear
error bits.
 1.24  10-Oct-2003  briggs Properly clear any latched errors before re-enabling SERR/PERR for PCI-X
in ahd_reset().
 1.23  30-Sep-2003  briggs Make sure that we don't blow away the enables in ahd_reset() on PCI-X.
 1.22  02-Sep-2003  fvdl * Make the ahc and ahd probes more alike.
* Remove some redundant code.
* ahd: Don't initiate negotiation for a discovery xs when the negotiation goal
is set. Just looking at the auto_negotiate mask is enough, and it can
cause an endless loop if the request gets requeued (happens with a
of a PPR negotiation, which ends with a busfree).
 1.21  29-Aug-2003  thorpej Apply the following change from 06/28/2003 04:46:54 by gibbs to the
FreeBSD ahd driver:

Fix a race condition in the flushing of commands that
have completed across the bus but not to the host before
processing of an exception condition (busfree, bus reset,
etc.). When flushing the controller of completed commands,
we also look for packetized commands that have completed
with good status and are stored in the "good status fifo".
The hardware will post to the good status fifo even if
data for that command is still active in a FIFO. In
one particular failure case, a command outstanding on the
bus reconnected, transferred data into a FIFO, and provided
good status while the host driver was processing an expected
busfree event (PPR message negotiation). This resulted in
an entry in the good status fifo that we completed, but
since the sequencer was paused, the data in the data FIFO
for this command had never been transferred to the host.
Once the busfree processing was complete, the sequencer
was unpaused, and the data completed its transfer to the
host. In some instances, the client for the data was notified
of the completion and attempted to view the data before
it arrived. This case only occurred during FreeBSD's
multi-target probe of the SCSI bus while some devices are
negotiating to go packetized and some devices are already
running in packetized.

The fix is to run and FIFOs active with a context in the
good status fifo to completion before completing the command
to the SCSI layer. This requies duplicating the FIFO rundown
operations in the host driver that would usually be handled
by the firmware, but there is no other alternative.

Don't blindly shutdown the SCB dma engine when restarting
the sequencer. We may be killing an operation that is
not supposed to be cancelled. The cases where we need to
shutdown these dma engines are already handled elsewhere in
the driver.

Fix a few more ahd_in?() -> ahd_in?_scbram() instances.
 1.20  29-Aug-2003  thorpej Apply the following change from 06/28/2003 04:45:25 by gibbs to the
FreeBSD ahd driver:

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.
 1.19  29-Aug-2003  thorpej Apply the following change from 06/28/2003 04:42:11 by gibbs to the
FreeBSD ahd driver:

Correct a typo in a comment.

Add a comment in ahd_clear_critical_sections() about
our need to leave ENBUSFREE set in SIMODE1 while single
stepping.

Re-arrange some delay loops so that we always perform
a read after any register write and before the delay.
This should make the delay loop more accurate.

When completing message processing for a packetized
commention, return the controller to a state where
invalid non-packetized phases will still cause protocol
violations. These are the same operations as those
performed in the clear_target_state routine in the
firmware.

Now that we have a chip with working ABORTPENDING
support (the 7901B), comment out the automatic use
of this feature until we can adequately test it.
The previous checkin updated the bug mask for the
7901B so this code was exercised.

When resetting the bus, perform an ahd_flush_device_writes()
call so that our reset assertion delay is acurately
timed from when the reset bit is written to the controller.
 1.18  29-Aug-2003  thorpej Apply the following change from 07-23-2003 22:06:34 by gibbs to the
FreeBSD ahd driver:

Add parenthesis so that we get all of the bits all
of the contents of the CCSCBCTL register into our
local varaible. The other bits are used in later tests.
This avoids a potential deadlock in ahd_run_qoutfifo()
if we happen to catch the DMA engine in just the right
state.
 1.17  29-Aug-2003  thorpej Apply the following change from 07/06/2003 23:53:39 by gibbs to the
FreeBSD ahd driver:

When single stepping, only leave ENBUSFREE enabled
if it was already enabled. We don't want to set it
when it shouldn't be set, we just don't want to
inadvertantly turn it off. This should fix a recent
report of the aic7xxx driver repeatedly complaining of
"unexpected busfree while idle" in one configuration.
 1.16  29-Aug-2003  thorpej Apply the following change made 06/06/2003 23:51:13 by gibbs to the
FreeBSD ahd driver:

Work around SCSI spec violation by the Quantum Atlas 10K.
This drive delays going async after receiving a WDTR
message. We now send an SDTR message after a WDTR even
if our goal is to go async. This should work even for
confused devices.

If we get an unexpected busfree when attempting a WDTR
or SDTR, only set the goal negotiation parameters we were
trying to negotiate to off. This means that should a WDTR
message fail, we will still try an SDTR if our goal is
non-async.

Fix a few more places where we were looking at goal.period
instead of goal.offset for determining if we should be
negotiating sync. This should not have any impact on
our behavior, but the offset is more definitive and should
be used.
 1.15  29-Aug-2003  thorpej Apply the following change from 6/6/2003 23:48:18 by gibbs to the
FreeBSD ahd driver:

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.
 1.14  29-Aug-2003  thorpej Update FreeBSD RCS ID for last.
 1.13  29-Aug-2003  thorpej Apply the following change from 5/30/2003 02:15:15 made by scottl to the
FreeBSD ahd driver:

aic79xx.c:
Use the special LUNLEN_SINGLE_LEVEL constant for
post Rev A4 hardware for single byte luns. Without
this change, Rev B hardware would place the single
byte of lun data in byte 0 of the lun structure when
it should be in byte 1. Since there are few if any
devices on the market that support multiple luns in
target mode, the corrupted lun field (which was only
corrupted for non-zero luns) wasn't hurting us.

Approved by: re (rwatson)
 1.12  29-Aug-2003  thorpej Apply the following change made on 5/26/2003 21:43:29 by gibbs to the
FreeBSD ahd driver:

aic79xx.c:
aic79xx_osm.h:
aic7xxx_osm.h:
Explicitly define functions that take no arguments
with "(void)"

Approved by: RE
 1.11  29-Aug-2003  thorpej Apply the following change made on 5/26/2003 21:26:51 by gibbs to the
FreeBSD ahd driver:

Correct/Simplify ignore wide residue message handling

aic79xx.c:
In ahd_handle_ign_wide_residue():
o Use SCB_XFERLEN_ODD SCB field to determine transfer
"oddness" rather than the DATA_COUNT_ODD logic.
SCB_XFERLEN_ODD is toggled on every ignore wide
residue message so that multiple ignore wide residue
messages for the same transaction are properly supported.
o If the sg list has been exausted, the sequencer
doesn't bother to update the residual data count
since it is known to be zero. Perform the zeroing
manually before calculating the remaining data count.
o Use multibyte in/out macros instead of shifting/masking
by hand.

aic79xx_inline.h:
In ahd_setup_scb_common(), setup the SCB_XFERLEN_ODD field.

aic79xx.reg:
Use the SCB_TASK_ATTRIBUTE field as a bit field in the
non-packetized case. We currently only define one bit,
SCB_XFERLEN_ODD.

Remove the ODD_SEG bit field that was used to carry the odd
transfer length information through the SG cache. This
is obviated by SCB_XFERLEN_ODD field.

Remove the DATA_COUNT_ODD scratch ram byte that was used
dynamicaly compute data transfer oddness. This is obviated
by SCB_XFERLEN_ODD field.

aic79xx.seq:
Remove all updates to the DATA_COUNT_ODD scratch ram field.
Remove all uses of ODD_SEG. These two save quite a few
sequencer instructions.

Use SCB_XFERLEN_ODD to validate the end of transfer
ignore wide residue message case.
 1.10  29-Aug-2003  thorpej Apply the following change made 5/26/2003 21:18:48 by gibbs to the
FreeBSD ahd driver:

Change hadling of the Rev. A packetized lun output bug
to be more efficient by having the sequencer copy the
single byte of valid lun data into the long lun field.

aic79xx.c:
Memset our hardware SCB to 0 so that untouched
fields don't confuse diagnostic output. With the
old method for handling the Rev A bug, if the long
lun field was not 0, this could result in bogus
lun information being sent to drives.

Use the same SCB transfer size for all chip types
now that the long lun is not DMA'ed to the chip.

aic79xx.seq:
Add code to copy lun information for Rev.A hardware.

aic79xx_inline.h:
Remove host update of the long_lun field on every
packetized command.
 1.9  29-Aug-2003  thorpej Apply the following change checked in 2003/05/04 00:20:07 by gibbs
to the FreeBSD ahd driver:

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.
 1.8  28-Aug-2003  thorpej Make sure we consistently report DT when sending an xfer mode async event.
 1.7  26-Jul-2003  thorpej Make this work on systems where bus_dmamap_sync() is not a noop.
In particular, when doing the "swap hscbs" trick, the scb must
reference the correct hscb_map when it gets a new hscb, otherwise
when you go to sync an hscb later, you could end up using the wrong
dmamap.

In order to make this work, we have to convert the shared_data stuff
to use a map_node, because of the "sentinel" trick played with the
initial "next_hscb".

This driver now works on XScale-based platforms.
 1.6  14-Jul-2003  lukem add missing __KERNEL_RCSID()
 1.5  14-May-2003  wiz branches: 1.5.2;
Correct spelling of coalesce. (Will forward to Justin Gibbs.)
 1.4  03-May-2003  wiz DMA, not dma nor Dma.
 1.3  21-Apr-2003  fvdl Remove unused variable.
 1.2  21-Apr-2003  fvdl Remove trigraph.
 1.1  21-Apr-2003  fvdl ahd, driver for Adaptec 790x U320 controllers. Originally by Justin Gibbs
for FreeBSD, ported to NetBSD by Pascal Renauld, Network Storage Solutions,
Inc, plus a bunch of changes by me.

This driver is as yet untested in this final form, it will be added
to config files when it has been tested.
 1.5.2.6  11-Dec-2005  christos Sync with head.
 1.5.2.5  10-Nov-2005  skrll Sync with HEAD. Here we go again...
 1.5.2.4  04-Mar-2005  skrll Sync with HEAD.

Hi Perry!
 1.5.2.3  21-Sep-2004  skrll Fix the sync with head I botched.
 1.5.2.2  18-Sep-2004  skrll Sync with HEAD.
 1.5.2.1  03-Aug-2004  skrll Sync with HEAD
 1.27.6.1  16-Dec-2005  jmc Pullup rev 1.32 (requested by bouyer in ticket #10177)

Don't call alloc_scb() (which can call bus_dmamem_alloc/map) from
ADAPTER_REQ_RUN_XFER context (which can be interrupt context), defer this
to the ADAPTER_REQ_GROW_RESOURCES callback. Fixes a panic in uvm.
 1.27.4.1  16-Dec-2005  jmc Pullup rev 1.32 (requested by bouyer in ticket #10177)

Don't call alloc_scb() (which can call bus_dmamem_alloc/map) from
ADAPTER_REQ_RUN_XFER context (which can be interrupt context), defer this
to the ADAPTER_REQ_GROW_RESOURCES callback. Fixes a panic in uvm.
 1.27.2.1  16-Dec-2005  jmc Pullup rev 1.32 (requested by bouyer in ticket #10177)

Don't call alloc_scb() (which can call bus_dmamem_alloc/map) from
ADAPTER_REQ_RUN_XFER context (which can be interrupt context), defer this
to the ADAPTER_REQ_GROW_RESOURCES callback. Fixes a panic in uvm.
 1.28.6.1  19-Mar-2005  yamt sync with head. xen and whitespace. xen part is not finished.
 1.28.4.1  29-Apr-2005  kent sync with -current
 1.30.2.1  29-Nov-2005  tron Pull up following revision(s) (requested by bouyer in ticket #1014):
sys/dev/ic/aic7xxx.c: revision 1.117
sys/dev/ic/aic79xxvar.h: revision 1.20
sys/dev/ic/aic79xx_osm.c: revision 1.13
sys/dev/ic/aic7xxx_inline.h: revision 1.7
sys/dev/ic/aic79xx.c: revision 1.32
sys/dev/ic/aic7xxx_osm.c: revision 1.19
sys/dev/ic/aic7xxxvar.h: revision 1.50
Don't call alloc_scb() (which can call bus_dmamem_alloc/map) from
ADAPTER_REQ_RUN_XFER context (which can be interrupt context), defer this
to the ADAPTER_REQ_GROW_RESOURCES callback.
Fix a panic in uvm reported by John R. Shannon on port-xen; patch tested on
ahc by me and on ahd by John.
 1.31.8.1  29-Nov-2005  yamt sync with head.
 1.31.2.4  24-Mar-2008  yamt sync with head.
 1.31.2.3  03-Sep-2007  yamt sync with head.
 1.31.2.2  30-Dec-2006  yamt sync with head.
 1.31.2.1  21-Jun-2006  yamt sync with head.
 1.33.10.1  19-Apr-2006  elad sync with head.
 1.33.8.1  13-Mar-2006  yamt sync with head.
 1.33.6.1  22-Apr-2006  simonb Sync with head.
 1.33.4.1  09-Sep-2006  rpaulo sync with head
 1.34.12.2  10-Dec-2006  yamt sync with head.
 1.34.12.1  22-Oct-2006  yamt sync with head
 1.34.10.1  18-Nov-2006  ad Sync with head.
 1.36.4.1  12-Mar-2007  rmind Sync with HEAD.
 1.37.36.1  03-Apr-2008  mjf Sync with HEAD.
 1.37.32.1  24-Mar-2008  keiichi sync with head.
 1.37.16.1  23-Mar-2008  matt sync with HEAD
 1.38.18.1  13-May-2009  jym Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.
 1.38.12.1  28-Apr-2009  skrll Sync with HEAD.
 1.38.10.1  13-Dec-2008  haad Update haad-dm branch to haad-dm-base2.
 1.38.4.2  16-Sep-2009  yamt sync with head
 1.38.4.1  04-May-2009  yamt sync with head.
 1.45.16.1  18-May-2014  rmind sync with head
 1.45.12.2  03-Dec-2017  jdolecek update from HEAD
 1.45.12.1  20-Aug-2014  tls Rebase to HEAD as of a few days ago.
 1.45.2.1  22-May-2014  yamt sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs. ("Protocol error: too many arguments")
 1.47.2.1  10-Aug-2014  tls Rebase.
 1.50.20.3  13-Apr-2020  martin Mostly merge changes from HEAD upto 20200411
 1.50.20.2  08-Apr-2020  martin Merge changes from current as of 20200406
 1.50.20.1  10-Jun-2019  christos Sync with HEAD
 1.56.6.1  01-Aug-2021  thorpej Sync with HEAD.

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