fix various typos in comments, mainly immediatly/immediately/,
as well shared and recently fixed typos in OpenBSD code by Jonathan Grey.

s/occurence/occurrence/

The atapibus detach path did hold the channel mutex while calling into autoconf,
which would trigger a panic when unplugging a USB ATAPI CDROM.

Align detach code for scsibus and atapibus to fix this.

Also avoid races when detaching devices by replacing callout_stop with
callout_halt.

branches: 1.88.8;
Make scsipi framework MPSAFE.

Data structures are now protected by a per-adapter mutex at IPL_BIO
that is created by the scsibus or atapibus instance when the adapter
is configured.
The enable reference counter and the channel freeze counter which are
currently used by HBA code before the adapter is configured, are made
atomic.
The target drivers are now all tagged as D_MPSAFE.

Almost all HBA drivers still require the kernel lock to present,
so all callbacks into HBA code are still protected by kernel lock
unless the driver is tagged as SCSIPI_ADAPT_MPSAFE.

TODO: refactor sd and cd to use dksubr.

Avoid calling bufq_free() from critical code sections.

branches: 1.86.4; 1.86.8;
Add d_discard to all struct cdevsw instances I could find.

All have been set to "nodiscard"; some should get a real implementation.

branches: 1.85.2;
Change (mostly mechanically) every cdevsw/bdevsw I can find to use
designated initializers.

I have not built every extant kernel so I have probably broken at
least one build; however I've also found and fixed some wrong
cdevsw/bdevsw entries so even if so I think we come out ahead.

branches: 1.84.2; 1.84.4;
one line comments on one line.

Unbreak the build.

Remove a pointless #if 0, compiler will eliminate the code anways.
Noticed by skrll.

Convert to device_t, aka softc/device_t split, and clean up a bit the code.

branches: 1.80.12; 1.80.16; 1.80.18;
Delete do-nothing device-activation hooks.

Remove some unecessary includes sys/user.h header.

struct device * -> device_t, no functional changes intended.

struct cfdata * -> cfdata_t, no functional changes intended.

branches: 1.76.2;
g/c BUFQ_FOO() macros and use bufq_foo() directly.

make this compile

branches: 1.74.6;
Use device_lookup_private() rather than using cd_devs[] directly to get softc.

XXX maybe we should change a type of cd_devs[] in struct cfdriver
from (void *) to device_t.

branches: 1.73.2; 1.73.4; 1.73.6;
use aprint_*_dev and device_xname

branches: 1.72.26; 1.72.28;
It's not a good idea for device drivers to modify b_flags, as they don't
need to understand the locking around that field. Instead of setting
B_ERROR, set b_error instead. b_error is 'owned' by whoever completes
the I/O request.

branches: 1.71.2;
Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

branches: 1.70.2; 1.70.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.69.4;
__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.67.2; 1.67.4;
add missing initializer

Use device_private().

Use device_unit().

branches: 1.64.2; 1.64.4; 1.64.6;
Use device_is_active() rather than testing dv_flags for DVF_ACTIVE
directly.

branches: 1.63.2; 1.63.4; 1.63.6;
merge ktrace-lwp.

- change the way to specify a bufq strategy. (by string rather than by number)
- rather than embedding bufq_state in driver softc,
have a pointer to the former.
- move bufq related functions from kern/subr_disk.c to kern/subr_bufq.c.
- rename method to strategy for consistency.
- move some definitions which don't need to be exposed to the rest of kernel
from sys/bufq.h to sys/bufq_impl.h.
(is it better to move it to kern/ or somewhere?)
- fix some obvious breakage in dev/qbus/ts.c. (not tested)

branches: 1.61.2;
- remove bogus casts
- add more const

introduce a function to drain bufq and use it where appropriate.

branches: 1.59.4;
Backing out changes to clean up scsipi. I was pointed out there were
problems i hadn't seen. To prevent lossage i'd decided to back off all
changes and let them be reviewed on tech-kern.

Part of the cleanup of sys/scsipi's use of types; rename all u_int* to
uint* and change the u_long's to uint32_t's where possible. Note that the
iocl definitions/hooks have to be ulong (or u_long) or they'll bomb out.

branches: 1.57.4;
move buffer queue related stuffs from buf.h to their own header, bufq.h.

Adjust some debug printfs after b_bcount was changed from long to int.
From Patrick Welche on current-users@

Oops; fix ssrestart().

Do not manipulate xs->bp in "generic" code -- do it only in the psw_done
routine. As part of this, pass down our pre-parsed error code -- though this
interface will probably change later to accomodate better error handling.

Improve handling of memory shortage, to fix problems like:
sd3(mpt0:0:1:0): unable to allocate scsipi_xfer
sd3: not queued, error 12
Havard Eidnes's analysis of this problem is that the scsipi_xfer pool is
competing for resources with other pools, including the the inode and vnode
pools which can grow quite large.

*_scsipi_cmd(): don't biodone the buffer if scsipi_make_xs() fails, let the
caller deal with the problem
start function of block devices drivers: dequeue the buffer after the
scsipi_command() call. If scsipi_command() fails with ENOMEM don't dequeue
the buffer, and schedule a callout to call the start function after
some delay.
scsipi_init(): prime the scsipi_xfer_pool with one page. This ensure that
there is always some scsipi_xfer to play with. If scsipi_command() fails
because of pool_get(), we're sure there will be resources available later,
when the pending commands have completed.

Reviewed by Jason Thorpe and Havard Eidnes.
Todo: remove the "unable to allocate scsipi_xfer" and "not queued, error %d"
printfs, but I choose to keep them for now, to help make sure the code does
what it should.

Use ANSI function decls and make use of static.

branches: 1.51.2;
Use scsipi_adapter_minphys().

Use the const shaker.

branches: 1.49.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

use PRId64 to printf bp->b_blkno, which is of type daddr_t

Remove a line of unreachable code. It seems to be a remnant of starting
off with a different driver, and the way this code is structured the
offending line isn't needed.

merge kqueue branch into -current

kqueue provides a stateful and efficient event notification framework
currently supported events include socket, file, directory, fifo,
pipe, tty and device changes, and monitoring of processes and signals

kqueue is supported by all writable filesystems in NetBSD tree
(with exception of Coda) and all device drivers supporting poll(2)

based on work done by Jonathan Lemon for FreeBSD
initial NetBSD port done by Luke Mewburn and Jason Thorpe

Add trailing ; to CFATTACH_DECL.

Use CFATTACH_DECL().

Declare all cfattach structures const.

recognize HP ScanJet 4c.
add a catch-all case for other HP scanners.
remove a local version of atoi() in favor of strtoul() from libkern.

Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

Convert to new device buffer queue interface.

branches: 1.38.8;
don't need <sys/types.h> when including <sys/param.h>

add RCSIDs

branches: 1.36.2;
bcopy -> memcpy

branches: 1.35.2;
Make it compile with SCSIPI_DEBUG

Pull up the thorpej_scsipi branch to main branch.
This is a completely rewritten scsipi_xfer execution engine, and the
associated changes to HBA drivers. Overview of changes & features:
- All xfers are queued in the mid-layer, rather than doing so in an
ad-hoc fashion in individual adapter drivers.
- Adapter/channel resource management in the mid-layer, avoids even trying
to start running an xfer if the adapter/channel doesn't have the resources.
- Better communication between the mid-layer and the adapters.
- Asynchronous event notification mechanism from adapter to mid-layer and
peripherals.
- Better peripheral queue management: freeze/thaw, sorted requeueing during
recovery, etc.
- Clean separation of peripherals, adapters, and adapter channels (no more
scsipi_link).
- Kernel thread for each scsipi_channel makes error recovery much easier
(no more dealing with interrupt context when recovering from an error).
- Mid-layer support for tagged queueing: commands can have the tag type
set explicitly, tag IDs are allocated in the mid-layer (thus eliminating
the need to use buggy tag ID allocation schemes in many adapter drivers).
- support for QUEUE FULL and CHECK CONDITION status in mid-layer; the command
will be requeued, or a REQUEST SENSE will be sent as appropriate.

Just before the merge syssrc has been tagged with thorpej_scsipi_beforemerge

branches: 1.33.2;
Call vdevgone() with correct minor range.

Support device detach.
Don't call scanjet_attach() for all HP scanners.
Also, ANSIfy while I'm here.

Add an entry for the HP ScanJet 6300C.

branches: 1.30.2;
Get rid of register declarations.

Update for sys/buf.h/disksort_*() changes.

newline terminate ss: atatch message - from Roger Brooks

allow ioctl() on all scanner device nodes - now SANE can work with ss* driver

branches: 1.26.2; 1.26.8;
Cleanup the scsipi_xfer flags:
- `flags' is now gone, replaced with `xs_control' and `xs_status'.
- Massive cleanup of the control flags. Now we explicitly say that
a job is to complete asynchronously, rather than relying on side-effects,
and use a new flag to now that device discovery is being performed.
- Do SCSI device discovery interrupt-driven.

branches: 1.25.2;
Abort transfer if b_blkno is negative. Closes PR kern/5553 by Johan Danielsson.

When closing, wait for pending xfers to drain before deleting the reference
to the adapter.

Add adapter reference counting for SCSI and ATAPI devices.

kill the last remnants of __BROKEN_INDIRECT_CONFIG. (only the pica port
used it, and it's non-working and apparently slated for replacement.)

ss->special could be NULL, so sane would crash the kernel.

Set a flag during auto-configuration, so SCSI_AUTOCONF can be passed
when doing additional I/O from the scanner attach functions.

Adjust for changes to config.

Recognize HP ScanJet 5p.

branches: 1.17.2;
Cosmetic changes to keep coding style consistency in this directory;

- Indent with tab of width 8.
- Use four column to indent continuation line.
- Fold long line if possible.
- Use return (xx) instead of return xx.
- Compare pointer against NULL instead of testing like boolean.
- Delete whitespace at the end of line.
- Delete whitespace in front of function call operator.
- Delete whitespace after cast.
- Dereference a pointer to function explicitly.
- Add an empty line after local variable declaration.
- Use NULL instead of (char *)0.
- Dont use block for single statement.

branches: 1.16.2;
Merge scsipi branch in the mainline. This add support for ATAPI devices
(currently only CD-ROM drives on i386). The sys/dev/scsipi system provides 2
busses to which devices can attach (scsibus and atapibus). This needed to
change some include files and structure names in the low level scsi drivers.

update these so they compile whether or not __BROKEN_INDIRECT_CONFIG
is defined.

Add an inquiry pattern for the HP ScanJet 4p.
From Valtteri Vuorikoski <vuori@notcom.org>, PR #2957.

revert previous kprintf change

printf -> kprintf, sprintf -> ksprintf

Some MUSTEK scanners fill the vendor string in the SCSI identify
string with 0xFF instead of 0x20. Shorten the compare to 6 bytes to
take care of this.

Fixes PR #2617 by myself, which is based on a private problem report
by Neil Brewitt.

Cleanup the rest of the SCSIDEBUG printfs. From Bernd Ernesti.

- Eliminate scsi_conf.h
- Fix prototypes
- Fix PR/2248 [Problems with HP scanjet...]

New device attachment scheme:

- split softc size and match/attach out from cfdriver into
a new struct cfattach.

- new "attach" directive for files.*. May specify the name of
the cfattach structure, so that devices may be easily attached
to parents with different autoconfiguration semantics.

Normalize SCSI autoconfiguration output.
From Chris Demetriou <cgd@NetBSD.ORG>. Fixes PR #1958.

Handle EOF a little differently.

Change variable name to avoid GCC warning.

Minor tweak; make sure window size is 0 on close.

Missed some prototyping foo.

Truncate to the window size in ssminphys(), not ssread().

Add SCSI scanner support by Kenneth Stailey and Joachim Koenig-Baltes,
hacked a bit. Needs more work.

s/occurence/occurrence/

The atapibus detach path did hold the channel mutex while calling into autoconf,
which would trigger a panic when unplugging a USB ATAPI CDROM.

Align detach code for scsibus and atapibus to fix this.

Also avoid races when detaching devices by replacing callout_stop with
callout_halt.

branches: 1.88.8;
Make scsipi framework MPSAFE.

Data structures are now protected by a per-adapter mutex at IPL_BIO
that is created by the scsibus or atapibus instance when the adapter
is configured.
The enable reference counter and the channel freeze counter which are
currently used by HBA code before the adapter is configured, are made
atomic.
The target drivers are now all tagged as D_MPSAFE.

Almost all HBA drivers still require the kernel lock to present,
so all callbacks into HBA code are still protected by kernel lock
unless the driver is tagged as SCSIPI_ADAPT_MPSAFE.

TODO: refactor sd and cd to use dksubr.

Avoid calling bufq_free() from critical code sections.

branches: 1.86.4; 1.86.8;
Add d_discard to all struct cdevsw instances I could find.

All have been set to "nodiscard"; some should get a real implementation.

branches: 1.85.2;
Change (mostly mechanically) every cdevsw/bdevsw I can find to use
designated initializers.

I have not built every extant kernel so I have probably broken at
least one build; however I've also found and fixed some wrong
cdevsw/bdevsw entries so even if so I think we come out ahead.

branches: 1.84.2; 1.84.4;
one line comments on one line.

Unbreak the build.

Remove a pointless #if 0, compiler will eliminate the code anways.
Noticed by skrll.

Convert to device_t, aka softc/device_t split, and clean up a bit the code.

branches: 1.80.12; 1.80.16; 1.80.18;
Delete do-nothing device-activation hooks.

Remove some unecessary includes sys/user.h header.

struct device * -> device_t, no functional changes intended.

struct cfdata * -> cfdata_t, no functional changes intended.

branches: 1.76.2;
g/c BUFQ_FOO() macros and use bufq_foo() directly.

make this compile

branches: 1.74.6;
Use device_lookup_private() rather than using cd_devs[] directly to get softc.

XXX maybe we should change a type of cd_devs[] in struct cfdriver
from (void *) to device_t.

branches: 1.73.2; 1.73.4; 1.73.6;
use aprint_*_dev and device_xname

branches: 1.72.26; 1.72.28;
It's not a good idea for device drivers to modify b_flags, as they don't
need to understand the locking around that field. Instead of setting
B_ERROR, set b_error instead. b_error is 'owned' by whoever completes
the I/O request.

branches: 1.71.2;
Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

branches: 1.70.2; 1.70.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.69.4;
__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.67.2; 1.67.4;
add missing initializer

Use device_private().

Use device_unit().

branches: 1.64.2; 1.64.4; 1.64.6;
Use device_is_active() rather than testing dv_flags for DVF_ACTIVE
directly.

branches: 1.63.2; 1.63.4; 1.63.6;
merge ktrace-lwp.

- change the way to specify a bufq strategy. (by string rather than by number)
- rather than embedding bufq_state in driver softc,
have a pointer to the former.
- move bufq related functions from kern/subr_disk.c to kern/subr_bufq.c.
- rename method to strategy for consistency.
- move some definitions which don't need to be exposed to the rest of kernel
from sys/bufq.h to sys/bufq_impl.h.
(is it better to move it to kern/ or somewhere?)
- fix some obvious breakage in dev/qbus/ts.c. (not tested)

branches: 1.61.2;
- remove bogus casts
- add more const

introduce a function to drain bufq and use it where appropriate.

branches: 1.59.4;
Backing out changes to clean up scsipi. I was pointed out there were
problems i hadn't seen. To prevent lossage i'd decided to back off all
changes and let them be reviewed on tech-kern.

Part of the cleanup of sys/scsipi's use of types; rename all u_int* to
uint* and change the u_long's to uint32_t's where possible. Note that the
iocl definitions/hooks have to be ulong (or u_long) or they'll bomb out.

branches: 1.57.4;
move buffer queue related stuffs from buf.h to their own header, bufq.h.

Adjust some debug printfs after b_bcount was changed from long to int.
From Patrick Welche on current-users@

Oops; fix ssrestart().

Do not manipulate xs->bp in "generic" code -- do it only in the psw_done
routine. As part of this, pass down our pre-parsed error code -- though this
interface will probably change later to accomodate better error handling.

Improve handling of memory shortage, to fix problems like:
sd3(mpt0:0:1:0): unable to allocate scsipi_xfer
sd3: not queued, error 12
Havard Eidnes's analysis of this problem is that the scsipi_xfer pool is
competing for resources with other pools, including the the inode and vnode
pools which can grow quite large.

*_scsipi_cmd(): don't biodone the buffer if scsipi_make_xs() fails, let the
caller deal with the problem
start function of block devices drivers: dequeue the buffer after the
scsipi_command() call. If scsipi_command() fails with ENOMEM don't dequeue
the buffer, and schedule a callout to call the start function after
some delay.
scsipi_init(): prime the scsipi_xfer_pool with one page. This ensure that
there is always some scsipi_xfer to play with. If scsipi_command() fails
because of pool_get(), we're sure there will be resources available later,
when the pending commands have completed.

Reviewed by Jason Thorpe and Havard Eidnes.
Todo: remove the "unable to allocate scsipi_xfer" and "not queued, error %d"
printfs, but I choose to keep them for now, to help make sure the code does
what it should.

Use ANSI function decls and make use of static.

branches: 1.51.2;
Use scsipi_adapter_minphys().

Use the const shaker.

branches: 1.49.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

use PRId64 to printf bp->b_blkno, which is of type daddr_t

Remove a line of unreachable code. It seems to be a remnant of starting
off with a different driver, and the way this code is structured the
offending line isn't needed.

merge kqueue branch into -current

kqueue provides a stateful and efficient event notification framework
currently supported events include socket, file, directory, fifo,
pipe, tty and device changes, and monitoring of processes and signals

kqueue is supported by all writable filesystems in NetBSD tree
(with exception of Coda) and all device drivers supporting poll(2)

based on work done by Jonathan Lemon for FreeBSD
initial NetBSD port done by Luke Mewburn and Jason Thorpe

Add trailing ; to CFATTACH_DECL.

Use CFATTACH_DECL().

Declare all cfattach structures const.

recognize HP ScanJet 4c.
add a catch-all case for other HP scanners.
remove a local version of atoi() in favor of strtoul() from libkern.

Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

Convert to new device buffer queue interface.

branches: 1.38.8;
don't need <sys/types.h> when including <sys/param.h>

add RCSIDs

branches: 1.36.2;
bcopy -> memcpy

branches: 1.35.2;
Make it compile with SCSIPI_DEBUG

Pull up the thorpej_scsipi branch to main branch.
This is a completely rewritten scsipi_xfer execution engine, and the
associated changes to HBA drivers. Overview of changes & features:
- All xfers are queued in the mid-layer, rather than doing so in an
ad-hoc fashion in individual adapter drivers.
- Adapter/channel resource management in the mid-layer, avoids even trying
to start running an xfer if the adapter/channel doesn't have the resources.
- Better communication between the mid-layer and the adapters.
- Asynchronous event notification mechanism from adapter to mid-layer and
peripherals.
- Better peripheral queue management: freeze/thaw, sorted requeueing during
recovery, etc.
- Clean separation of peripherals, adapters, and adapter channels (no more
scsipi_link).
- Kernel thread for each scsipi_channel makes error recovery much easier
(no more dealing with interrupt context when recovering from an error).
- Mid-layer support for tagged queueing: commands can have the tag type
set explicitly, tag IDs are allocated in the mid-layer (thus eliminating
the need to use buggy tag ID allocation schemes in many adapter drivers).
- support for QUEUE FULL and CHECK CONDITION status in mid-layer; the command
will be requeued, or a REQUEST SENSE will be sent as appropriate.

Just before the merge syssrc has been tagged with thorpej_scsipi_beforemerge

branches: 1.33.2;
Call vdevgone() with correct minor range.

Support device detach.
Don't call scanjet_attach() for all HP scanners.
Also, ANSIfy while I'm here.

Add an entry for the HP ScanJet 6300C.

branches: 1.30.2;
Get rid of register declarations.

Update for sys/buf.h/disksort_*() changes.

newline terminate ss: atatch message - from Roger Brooks

allow ioctl() on all scanner device nodes - now SANE can work with ss* driver

branches: 1.26.2; 1.26.8;
Cleanup the scsipi_xfer flags:
- `flags' is now gone, replaced with `xs_control' and `xs_status'.
- Massive cleanup of the control flags. Now we explicitly say that
a job is to complete asynchronously, rather than relying on side-effects,
and use a new flag to now that device discovery is being performed.
- Do SCSI device discovery interrupt-driven.

branches: 1.25.2;
Abort transfer if b_blkno is negative. Closes PR kern/5553 by Johan Danielsson.

When closing, wait for pending xfers to drain before deleting the reference
to the adapter.

Add adapter reference counting for SCSI and ATAPI devices.

kill the last remnants of __BROKEN_INDIRECT_CONFIG. (only the pica port
used it, and it's non-working and apparently slated for replacement.)

ss->special could be NULL, so sane would crash the kernel.

Set a flag during auto-configuration, so SCSI_AUTOCONF can be passed
when doing additional I/O from the scanner attach functions.

Adjust for changes to config.

Recognize HP ScanJet 5p.

branches: 1.17.2;
Cosmetic changes to keep coding style consistency in this directory;

- Indent with tab of width 8.
- Use four column to indent continuation line.
- Fold long line if possible.
- Use return (xx) instead of return xx.
- Compare pointer against NULL instead of testing like boolean.
- Delete whitespace at the end of line.
- Delete whitespace in front of function call operator.
- Delete whitespace after cast.
- Dereference a pointer to function explicitly.
- Add an empty line after local variable declaration.
- Use NULL instead of (char *)0.
- Dont use block for single statement.

branches: 1.16.2;
Merge scsipi branch in the mainline. This add support for ATAPI devices
(currently only CD-ROM drives on i386). The sys/dev/scsipi system provides 2
busses to which devices can attach (scsibus and atapibus). This needed to
change some include files and structure names in the low level scsi drivers.

update these so they compile whether or not __BROKEN_INDIRECT_CONFIG
is defined.

Add an inquiry pattern for the HP ScanJet 4p.
From Valtteri Vuorikoski <vuori@notcom.org>, PR #2957.

revert previous kprintf change

printf -> kprintf, sprintf -> ksprintf

Some MUSTEK scanners fill the vendor string in the SCSI identify
string with 0xFF instead of 0x20. Shorten the compare to 6 bytes to
take care of this.

Fixes PR #2617 by myself, which is based on a private problem report
by Neil Brewitt.

Cleanup the rest of the SCSIDEBUG printfs. From Bernd Ernesti.

- Eliminate scsi_conf.h
- Fix prototypes
- Fix PR/2248 [Problems with HP scanjet...]

New device attachment scheme:

- split softc size and match/attach out from cfdriver into
a new struct cfattach.

- new "attach" directive for files.*. May specify the name of
the cfattach structure, so that devices may be easily attached
to parents with different autoconfiguration semantics.

Normalize SCSI autoconfiguration output.
From Chris Demetriou <cgd@NetBSD.ORG>. Fixes PR #1958.

Handle EOF a little differently.

Change variable name to avoid GCC warning.

Minor tweak; make sure window size is 0 on close.

Missed some prototyping foo.

Truncate to the window size in ssminphys(), not ssread().

Add SCSI scanner support by Kenneth Stailey and Joachim Koenig-Baltes,
hacked a bit. Needs more work.

The atapibus detach path did hold the channel mutex while calling into autoconf,
which would trigger a panic when unplugging a USB ATAPI CDROM.

Align detach code for scsibus and atapibus to fix this.

Also avoid races when detaching devices by replacing callout_stop with
callout_halt.

Make scsipi framework MPSAFE.

Data structures are now protected by a per-adapter mutex at IPL_BIO
that is created by the scsibus or atapibus instance when the adapter
is configured.
The enable reference counter and the channel freeze counter which are
currently used by HBA code before the adapter is configured, are made
atomic.
The target drivers are now all tagged as D_MPSAFE.

Almost all HBA drivers still require the kernel lock to present,
so all callbacks into HBA code are still protected by kernel lock
unless the driver is tagged as SCSIPI_ADAPT_MPSAFE.

TODO: refactor sd and cd to use dksubr.

Avoid calling bufq_free() from critical code sections.

branches: 1.86.4; 1.86.8;
Add d_discard to all struct cdevsw instances I could find.

All have been set to "nodiscard"; some should get a real implementation.

branches: 1.85.2;
Change (mostly mechanically) every cdevsw/bdevsw I can find to use
designated initializers.

I have not built every extant kernel so I have probably broken at
least one build; however I've also found and fixed some wrong
cdevsw/bdevsw entries so even if so I think we come out ahead.

branches: 1.84.2; 1.84.4;
one line comments on one line.

Unbreak the build.

Remove a pointless #if 0, compiler will eliminate the code anways.
Noticed by skrll.

Convert to device_t, aka softc/device_t split, and clean up a bit the code.

branches: 1.80.12; 1.80.16; 1.80.18;
Delete do-nothing device-activation hooks.

Remove some unecessary includes sys/user.h header.

struct device * -> device_t, no functional changes intended.

struct cfdata * -> cfdata_t, no functional changes intended.

branches: 1.76.2;
g/c BUFQ_FOO() macros and use bufq_foo() directly.

make this compile

branches: 1.74.6;
Use device_lookup_private() rather than using cd_devs[] directly to get softc.

XXX maybe we should change a type of cd_devs[] in struct cfdriver
from (void *) to device_t.

branches: 1.73.2; 1.73.4; 1.73.6;
use aprint_*_dev and device_xname

branches: 1.72.26; 1.72.28;
It's not a good idea for device drivers to modify b_flags, as they don't
need to understand the locking around that field. Instead of setting
B_ERROR, set b_error instead. b_error is 'owned' by whoever completes
the I/O request.

branches: 1.71.2;
Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

branches: 1.70.2; 1.70.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.69.4;
__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.67.2; 1.67.4;
add missing initializer

Use device_private().

Use device_unit().

branches: 1.64.2; 1.64.4; 1.64.6;
Use device_is_active() rather than testing dv_flags for DVF_ACTIVE
directly.

branches: 1.63.2; 1.63.4; 1.63.6;
merge ktrace-lwp.

- change the way to specify a bufq strategy. (by string rather than by number)
- rather than embedding bufq_state in driver softc,
have a pointer to the former.
- move bufq related functions from kern/subr_disk.c to kern/subr_bufq.c.
- rename method to strategy for consistency.
- move some definitions which don't need to be exposed to the rest of kernel
from sys/bufq.h to sys/bufq_impl.h.
(is it better to move it to kern/ or somewhere?)
- fix some obvious breakage in dev/qbus/ts.c. (not tested)

branches: 1.61.2;
- remove bogus casts
- add more const

introduce a function to drain bufq and use it where appropriate.

branches: 1.59.4;
Backing out changes to clean up scsipi. I was pointed out there were
problems i hadn't seen. To prevent lossage i'd decided to back off all
changes and let them be reviewed on tech-kern.

Part of the cleanup of sys/scsipi's use of types; rename all u_int* to
uint* and change the u_long's to uint32_t's where possible. Note that the
iocl definitions/hooks have to be ulong (or u_long) or they'll bomb out.

branches: 1.57.4;
move buffer queue related stuffs from buf.h to their own header, bufq.h.

Adjust some debug printfs after b_bcount was changed from long to int.
From Patrick Welche on current-users@

Oops; fix ssrestart().

Do not manipulate xs->bp in "generic" code -- do it only in the psw_done
routine. As part of this, pass down our pre-parsed error code -- though this
interface will probably change later to accomodate better error handling.

Improve handling of memory shortage, to fix problems like:
sd3(mpt0:0:1:0): unable to allocate scsipi_xfer
sd3: not queued, error 12
Havard Eidnes's analysis of this problem is that the scsipi_xfer pool is
competing for resources with other pools, including the the inode and vnode
pools which can grow quite large.

*_scsipi_cmd(): don't biodone the buffer if scsipi_make_xs() fails, let the
caller deal with the problem
start function of block devices drivers: dequeue the buffer after the
scsipi_command() call. If scsipi_command() fails with ENOMEM don't dequeue
the buffer, and schedule a callout to call the start function after
some delay.
scsipi_init(): prime the scsipi_xfer_pool with one page. This ensure that
there is always some scsipi_xfer to play with. If scsipi_command() fails
because of pool_get(), we're sure there will be resources available later,
when the pending commands have completed.

Reviewed by Jason Thorpe and Havard Eidnes.
Todo: remove the "unable to allocate scsipi_xfer" and "not queued, error %d"
printfs, but I choose to keep them for now, to help make sure the code does
what it should.

Use ANSI function decls and make use of static.

branches: 1.51.2;
Use scsipi_adapter_minphys().

Use the const shaker.

branches: 1.49.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

use PRId64 to printf bp->b_blkno, which is of type daddr_t

Remove a line of unreachable code. It seems to be a remnant of starting
off with a different driver, and the way this code is structured the
offending line isn't needed.

merge kqueue branch into -current

kqueue provides a stateful and efficient event notification framework
currently supported events include socket, file, directory, fifo,
pipe, tty and device changes, and monitoring of processes and signals

kqueue is supported by all writable filesystems in NetBSD tree
(with exception of Coda) and all device drivers supporting poll(2)

based on work done by Jonathan Lemon for FreeBSD
initial NetBSD port done by Luke Mewburn and Jason Thorpe

Add trailing ; to CFATTACH_DECL.

Use CFATTACH_DECL().

Declare all cfattach structures const.

recognize HP ScanJet 4c.
add a catch-all case for other HP scanners.
remove a local version of atoi() in favor of strtoul() from libkern.

Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

Convert to new device buffer queue interface.

branches: 1.38.8;
don't need <sys/types.h> when including <sys/param.h>

add RCSIDs

branches: 1.36.2;
bcopy -> memcpy

branches: 1.35.2;
Make it compile with SCSIPI_DEBUG

Pull up the thorpej_scsipi branch to main branch.
This is a completely rewritten scsipi_xfer execution engine, and the
associated changes to HBA drivers. Overview of changes & features:
- All xfers are queued in the mid-layer, rather than doing so in an
ad-hoc fashion in individual adapter drivers.
- Adapter/channel resource management in the mid-layer, avoids even trying
to start running an xfer if the adapter/channel doesn't have the resources.
- Better communication between the mid-layer and the adapters.
- Asynchronous event notification mechanism from adapter to mid-layer and
peripherals.
- Better peripheral queue management: freeze/thaw, sorted requeueing during
recovery, etc.
- Clean separation of peripherals, adapters, and adapter channels (no more
scsipi_link).
- Kernel thread for each scsipi_channel makes error recovery much easier
(no more dealing with interrupt context when recovering from an error).
- Mid-layer support for tagged queueing: commands can have the tag type
set explicitly, tag IDs are allocated in the mid-layer (thus eliminating
the need to use buggy tag ID allocation schemes in many adapter drivers).
- support for QUEUE FULL and CHECK CONDITION status in mid-layer; the command
will be requeued, or a REQUEST SENSE will be sent as appropriate.

Just before the merge syssrc has been tagged with thorpej_scsipi_beforemerge

branches: 1.33.2;
Call vdevgone() with correct minor range.

Support device detach.
Don't call scanjet_attach() for all HP scanners.
Also, ANSIfy while I'm here.

Add an entry for the HP ScanJet 6300C.

branches: 1.30.2;
Get rid of register declarations.

Update for sys/buf.h/disksort_*() changes.

newline terminate ss: atatch message - from Roger Brooks

allow ioctl() on all scanner device nodes - now SANE can work with ss* driver

branches: 1.26.2; 1.26.8;
Cleanup the scsipi_xfer flags:
- `flags' is now gone, replaced with `xs_control' and `xs_status'.
- Massive cleanup of the control flags. Now we explicitly say that
a job is to complete asynchronously, rather than relying on side-effects,
and use a new flag to now that device discovery is being performed.
- Do SCSI device discovery interrupt-driven.

branches: 1.25.2;
Abort transfer if b_blkno is negative. Closes PR kern/5553 by Johan Danielsson.

When closing, wait for pending xfers to drain before deleting the reference
to the adapter.

Add adapter reference counting for SCSI and ATAPI devices.

kill the last remnants of __BROKEN_INDIRECT_CONFIG. (only the pica port
used it, and it's non-working and apparently slated for replacement.)

ss->special could be NULL, so sane would crash the kernel.

Set a flag during auto-configuration, so SCSI_AUTOCONF can be passed
when doing additional I/O from the scanner attach functions.

Adjust for changes to config.

Recognize HP ScanJet 5p.

branches: 1.17.2;
Cosmetic changes to keep coding style consistency in this directory;

- Indent with tab of width 8.
- Use four column to indent continuation line.
- Fold long line if possible.
- Use return (xx) instead of return xx.
- Compare pointer against NULL instead of testing like boolean.
- Delete whitespace at the end of line.
- Delete whitespace in front of function call operator.
- Delete whitespace after cast.
- Dereference a pointer to function explicitly.
- Add an empty line after local variable declaration.
- Use NULL instead of (char *)0.
- Dont use block for single statement.

branches: 1.16.2;
Merge scsipi branch in the mainline. This add support for ATAPI devices
(currently only CD-ROM drives on i386). The sys/dev/scsipi system provides 2
busses to which devices can attach (scsibus and atapibus). This needed to
change some include files and structure names in the low level scsi drivers.

update these so they compile whether or not __BROKEN_INDIRECT_CONFIG
is defined.

Add an inquiry pattern for the HP ScanJet 4p.
From Valtteri Vuorikoski <vuori@notcom.org>, PR #2957.

revert previous kprintf change

printf -> kprintf, sprintf -> ksprintf

Some MUSTEK scanners fill the vendor string in the SCSI identify
string with 0xFF instead of 0x20. Shorten the compare to 6 bytes to
take care of this.

Fixes PR #2617 by myself, which is based on a private problem report
by Neil Brewitt.

Cleanup the rest of the SCSIDEBUG printfs. From Bernd Ernesti.

- Eliminate scsi_conf.h
- Fix prototypes
- Fix PR/2248 [Problems with HP scanjet...]

New device attachment scheme:

- split softc size and match/attach out from cfdriver into
a new struct cfattach.

- new "attach" directive for files.*. May specify the name of
the cfattach structure, so that devices may be easily attached
to parents with different autoconfiguration semantics.

Normalize SCSI autoconfiguration output.
From Chris Demetriou <cgd@NetBSD.ORG>. Fixes PR #1958.

Handle EOF a little differently.

Change variable name to avoid GCC warning.

Minor tweak; make sure window size is 0 on close.

Missed some prototyping foo.

Truncate to the window size in ssminphys(), not ssread().

Add SCSI scanner support by Kenneth Stailey and Joachim Koenig-Baltes,
hacked a bit. Needs more work.

Make scsipi framework MPSAFE.

Data structures are now protected by a per-adapter mutex at IPL_BIO
that is created by the scsibus or atapibus instance when the adapter
is configured.
The enable reference counter and the channel freeze counter which are
currently used by HBA code before the adapter is configured, are made
atomic.
The target drivers are now all tagged as D_MPSAFE.

Almost all HBA drivers still require the kernel lock to present,
so all callbacks into HBA code are still protected by kernel lock
unless the driver is tagged as SCSIPI_ADAPT_MPSAFE.

TODO: refactor sd and cd to use dksubr.

Avoid calling bufq_free() from critical code sections.

branches: 1.86.4;
Add d_discard to all struct cdevsw instances I could find.

All have been set to "nodiscard"; some should get a real implementation.

branches: 1.85.2;
Change (mostly mechanically) every cdevsw/bdevsw I can find to use
designated initializers.

I have not built every extant kernel so I have probably broken at
least one build; however I've also found and fixed some wrong
cdevsw/bdevsw entries so even if so I think we come out ahead.

branches: 1.84.2; 1.84.4;
one line comments on one line.

Unbreak the build.

Remove a pointless #if 0, compiler will eliminate the code anways.
Noticed by skrll.

Convert to device_t, aka softc/device_t split, and clean up a bit the code.

branches: 1.80.12; 1.80.16; 1.80.18;
Delete do-nothing device-activation hooks.

Remove some unecessary includes sys/user.h header.

struct device * -> device_t, no functional changes intended.

struct cfdata * -> cfdata_t, no functional changes intended.

branches: 1.76.2;
g/c BUFQ_FOO() macros and use bufq_foo() directly.

make this compile

branches: 1.74.6;
Use device_lookup_private() rather than using cd_devs[] directly to get softc.

XXX maybe we should change a type of cd_devs[] in struct cfdriver
from (void *) to device_t.

branches: 1.73.2; 1.73.4; 1.73.6;
use aprint_*_dev and device_xname

branches: 1.72.26; 1.72.28;
It's not a good idea for device drivers to modify b_flags, as they don't
need to understand the locking around that field. Instead of setting
B_ERROR, set b_error instead. b_error is 'owned' by whoever completes
the I/O request.

branches: 1.71.2;
Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

branches: 1.70.2; 1.70.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.69.4;
__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.67.2; 1.67.4;
add missing initializer

Use device_private().

Use device_unit().

branches: 1.64.2; 1.64.4; 1.64.6;
Use device_is_active() rather than testing dv_flags for DVF_ACTIVE
directly.

branches: 1.63.2; 1.63.4; 1.63.6;
merge ktrace-lwp.

- change the way to specify a bufq strategy. (by string rather than by number)
- rather than embedding bufq_state in driver softc,
have a pointer to the former.
- move bufq related functions from kern/subr_disk.c to kern/subr_bufq.c.
- rename method to strategy for consistency.
- move some definitions which don't need to be exposed to the rest of kernel
from sys/bufq.h to sys/bufq_impl.h.
(is it better to move it to kern/ or somewhere?)
- fix some obvious breakage in dev/qbus/ts.c. (not tested)

branches: 1.61.2;
- remove bogus casts
- add more const

introduce a function to drain bufq and use it where appropriate.

branches: 1.59.4;
Backing out changes to clean up scsipi. I was pointed out there were
problems i hadn't seen. To prevent lossage i'd decided to back off all
changes and let them be reviewed on tech-kern.

Part of the cleanup of sys/scsipi's use of types; rename all u_int* to
uint* and change the u_long's to uint32_t's where possible. Note that the
iocl definitions/hooks have to be ulong (or u_long) or they'll bomb out.

branches: 1.57.4;
move buffer queue related stuffs from buf.h to their own header, bufq.h.

Adjust some debug printfs after b_bcount was changed from long to int.
From Patrick Welche on current-users@

Oops; fix ssrestart().

Do not manipulate xs->bp in "generic" code -- do it only in the psw_done
routine. As part of this, pass down our pre-parsed error code -- though this
interface will probably change later to accomodate better error handling.

Improve handling of memory shortage, to fix problems like:
sd3(mpt0:0:1:0): unable to allocate scsipi_xfer
sd3: not queued, error 12
Havard Eidnes's analysis of this problem is that the scsipi_xfer pool is
competing for resources with other pools, including the the inode and vnode
pools which can grow quite large.

*_scsipi_cmd(): don't biodone the buffer if scsipi_make_xs() fails, let the
caller deal with the problem
start function of block devices drivers: dequeue the buffer after the
scsipi_command() call. If scsipi_command() fails with ENOMEM don't dequeue
the buffer, and schedule a callout to call the start function after
some delay.
scsipi_init(): prime the scsipi_xfer_pool with one page. This ensure that
there is always some scsipi_xfer to play with. If scsipi_command() fails
because of pool_get(), we're sure there will be resources available later,
when the pending commands have completed.

Reviewed by Jason Thorpe and Havard Eidnes.
Todo: remove the "unable to allocate scsipi_xfer" and "not queued, error %d"
printfs, but I choose to keep them for now, to help make sure the code does
what it should.

Use ANSI function decls and make use of static.

branches: 1.51.2;
Use scsipi_adapter_minphys().

Use the const shaker.

branches: 1.49.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

use PRId64 to printf bp->b_blkno, which is of type daddr_t

Remove a line of unreachable code. It seems to be a remnant of starting
off with a different driver, and the way this code is structured the
offending line isn't needed.

merge kqueue branch into -current

kqueue provides a stateful and efficient event notification framework
currently supported events include socket, file, directory, fifo,
pipe, tty and device changes, and monitoring of processes and signals

kqueue is supported by all writable filesystems in NetBSD tree
(with exception of Coda) and all device drivers supporting poll(2)

based on work done by Jonathan Lemon for FreeBSD
initial NetBSD port done by Luke Mewburn and Jason Thorpe

Add trailing ; to CFATTACH_DECL.

Use CFATTACH_DECL().

Declare all cfattach structures const.

recognize HP ScanJet 4c.
add a catch-all case for other HP scanners.
remove a local version of atoi() in favor of strtoul() from libkern.

Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

Convert to new device buffer queue interface.

branches: 1.38.8;
don't need <sys/types.h> when including <sys/param.h>

add RCSIDs

branches: 1.36.2;
bcopy -> memcpy

branches: 1.35.2;
Make it compile with SCSIPI_DEBUG

Pull up the thorpej_scsipi branch to main branch.
This is a completely rewritten scsipi_xfer execution engine, and the
associated changes to HBA drivers. Overview of changes & features:
- All xfers are queued in the mid-layer, rather than doing so in an
ad-hoc fashion in individual adapter drivers.
- Adapter/channel resource management in the mid-layer, avoids even trying
to start running an xfer if the adapter/channel doesn't have the resources.
- Better communication between the mid-layer and the adapters.
- Asynchronous event notification mechanism from adapter to mid-layer and
peripherals.
- Better peripheral queue management: freeze/thaw, sorted requeueing during
recovery, etc.
- Clean separation of peripherals, adapters, and adapter channels (no more
scsipi_link).
- Kernel thread for each scsipi_channel makes error recovery much easier
(no more dealing with interrupt context when recovering from an error).
- Mid-layer support for tagged queueing: commands can have the tag type
set explicitly, tag IDs are allocated in the mid-layer (thus eliminating
the need to use buggy tag ID allocation schemes in many adapter drivers).
- support for QUEUE FULL and CHECK CONDITION status in mid-layer; the command
will be requeued, or a REQUEST SENSE will be sent as appropriate.

Just before the merge syssrc has been tagged with thorpej_scsipi_beforemerge

branches: 1.33.2;
Call vdevgone() with correct minor range.

Support device detach.
Don't call scanjet_attach() for all HP scanners.
Also, ANSIfy while I'm here.

Add an entry for the HP ScanJet 6300C.

branches: 1.30.2;
Get rid of register declarations.

Update for sys/buf.h/disksort_*() changes.

newline terminate ss: atatch message - from Roger Brooks

allow ioctl() on all scanner device nodes - now SANE can work with ss* driver

branches: 1.26.2; 1.26.8;
Cleanup the scsipi_xfer flags:
- `flags' is now gone, replaced with `xs_control' and `xs_status'.
- Massive cleanup of the control flags. Now we explicitly say that
a job is to complete asynchronously, rather than relying on side-effects,
and use a new flag to now that device discovery is being performed.
- Do SCSI device discovery interrupt-driven.

branches: 1.25.2;
Abort transfer if b_blkno is negative. Closes PR kern/5553 by Johan Danielsson.

When closing, wait for pending xfers to drain before deleting the reference
to the adapter.

Add adapter reference counting for SCSI and ATAPI devices.

kill the last remnants of __BROKEN_INDIRECT_CONFIG. (only the pica port
used it, and it's non-working and apparently slated for replacement.)

ss->special could be NULL, so sane would crash the kernel.

Set a flag during auto-configuration, so SCSI_AUTOCONF can be passed
when doing additional I/O from the scanner attach functions.

Adjust for changes to config.

Recognize HP ScanJet 5p.

branches: 1.17.2;
Cosmetic changes to keep coding style consistency in this directory;

- Indent with tab of width 8.
- Use four column to indent continuation line.
- Fold long line if possible.
- Use return (xx) instead of return xx.
- Compare pointer against NULL instead of testing like boolean.
- Delete whitespace at the end of line.
- Delete whitespace in front of function call operator.
- Delete whitespace after cast.
- Dereference a pointer to function explicitly.
- Add an empty line after local variable declaration.
- Use NULL instead of (char *)0.
- Dont use block for single statement.

branches: 1.16.2;
Merge scsipi branch in the mainline. This add support for ATAPI devices
(currently only CD-ROM drives on i386). The sys/dev/scsipi system provides 2
busses to which devices can attach (scsibus and atapibus). This needed to
change some include files and structure names in the low level scsi drivers.

update these so they compile whether or not __BROKEN_INDIRECT_CONFIG
is defined.

Add an inquiry pattern for the HP ScanJet 4p.
From Valtteri Vuorikoski <vuori@notcom.org>, PR #2957.

revert previous kprintf change

printf -> kprintf, sprintf -> ksprintf

Some MUSTEK scanners fill the vendor string in the SCSI identify
string with 0xFF instead of 0x20. Shorten the compare to 6 bytes to
take care of this.

Fixes PR #2617 by myself, which is based on a private problem report
by Neil Brewitt.

Cleanup the rest of the SCSIDEBUG printfs. From Bernd Ernesti.

- Eliminate scsi_conf.h
- Fix prototypes
- Fix PR/2248 [Problems with HP scanjet...]

New device attachment scheme:

- split softc size and match/attach out from cfdriver into
a new struct cfattach.

- new "attach" directive for files.*. May specify the name of
the cfattach structure, so that devices may be easily attached
to parents with different autoconfiguration semantics.

Normalize SCSI autoconfiguration output.
From Chris Demetriou <cgd@NetBSD.ORG>. Fixes PR #1958.

Handle EOF a little differently.

Change variable name to avoid GCC warning.

Minor tweak; make sure window size is 0 on close.

Missed some prototyping foo.

Truncate to the window size in ssminphys(), not ssread().

Add SCSI scanner support by Kenneth Stailey and Joachim Koenig-Baltes,
hacked a bit. Needs more work.