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History log of /src/sys/dev/scsipi/stvar.h
RevisionDateAuthorComments
 1.26  24-Mar-2018  mlelstv Use separate lock to protect internal state and release locks when
calling biodone.
 1.25  13-Apr-2015  riastradh branches: 1.25.10; 1.25.16;
Convert sys/dev to use <sys/rndsource.h>.
 1.24  28-Feb-2012  mbalmer branches: 1.24.2; 1.24.16;
Convert st(4) to device_t, while here clean up the code and use uintXX_t
instead of u_intXX_t.
 1.23  02-Feb-2012  tls branches: 1.23.2;
Entropy-pool implementation move and cleanup.

1) Move core entropy-pool code and source/sink/sample management code
to sys/kern from sys/dev.

2) Remove use of NRND as test for presence of entropy-pool code throughout
source tree.

3) Remove use of RND_ENABLED in device drivers as microoptimization to
avoid expensive operations on disabled entropy sources; make the
rnd_add calls do this directly so all callers benefit.

4) Fix bug in recent rnd_add_data()/rnd_add_uint32() changes that might
have lead to slight entropy overestimation for some sources.

5) Add new source types for environmental sensors, power sensors, VM
system events, and skew between clocks, with a sample implementation
for each.

ok releng to go in before the branch due to the difficulty of later
pullup (widespread #ifdef removal and moved files). Tested with release
builds on amd64 and evbarm and live testing on amd64.
 1.22  19-Nov-2011  tls branches: 1.22.2;
First step of random number subsystem rework described in
<20111022023242.BA26F14A158@mail.netbsd.org>. This change includes
the following:

An initial cleanup and minor reorganization of the entropy pool
code in sys/dev/rnd.c and sys/dev/rndpool.c. Several bugs are
fixed. Some effort is made to accumulate entropy more quickly at
boot time.

A generic interface, "rndsink", is added, for stream generators to
request that they be re-keyed with good quality entropy from the pool
as soon as it is available.

The arc4random()/arc4randbytes() implementation in libkern is
adjusted to use the rndsink interface for rekeying, which helps
address the problem of low-quality keys at boot time.

An implementation of the FIPS 140-2 statistical tests for random
number generator quality is provided (libkern/rngtest.c). This
is based on Greg Rose's implementation from Qualcomm.

A new random stream generator, nist_ctr_drbg, is provided. It is
based on an implementation of the NIST SP800-90 CTR_DRBG by
Henric Jungheim. This generator users AES in a modified counter
mode to generate a backtracking-resistant random stream.

An abstraction layer, "cprng", is provided for in-kernel consumers
of randomness. The arc4random/arc4randbytes API is deprecated for
in-kernel use. It is replaced by "cprng_strong". The current
cprng_fast implementation wraps the existing arc4random
implementation. The current cprng_strong implementation wraps the
new CTR_DRBG implementation. Both interfaces are rekeyed from
the entropy pool automatically at intervals justifiable from best
current cryptographic practice.

In some quick tests, cprng_fast() is about the same speed as
the old arc4randbytes(), and cprng_strong() is about 20% faster
than rnd_extract_data(). Performance is expected to improve.

The AES code in src/crypto/rijndael is no longer an optional
kernel component, as it is required by cprng_strong, which is
not an optional kernel component.

The entropy pool output is subjected to the rngtest tests at
startup time; if it fails, the system will reboot. There is
approximately a 3/10000 chance of a false positive from these
tests. Entropy pool _input_ from hardware random numbers is
subjected to the rngtest tests at attach time, as well as the
FIPS continuous-output test, to detect bad or stuck hardware
RNGs; if any are detected, they are detached, but the system
continues to run.

A problem with rndctl(8) is fixed -- datastructures with
pointers in arrays are no longer passed to userspace (this
was not a security problem, but rather a major issue for
compat32). A new kernel will require a new rndctl.

The sysctl kern.arandom() and kern.urandom() nodes are hooked
up to the new generators, but the /dev/*random pseudodevices
are not, yet.

Manual pages for the new kernel interfaces are forthcoming.
 1.21  06-Dec-2009  dyoung branches: 1.21.12;
Delete do-nothing device-activation hooks.
 1.20  15-Aug-2009  pgoyette 1. Move the mode_select functionality into common code (in st.c) and
invoke the common routine for both scsi and atapi tapes.

2. Replace a numeric constant with some sizeof's when calculating the
size of the mode_select command buffer, clear the entire buffer, and
KASSERT to ensure the page_0_size loaded from quirk table is valid.

3. Add a quirk for my Seagate Travan-40 tape drive.

As discussed on tech-kern@

Addresses my PR kern/34832
 1.19  12-May-2009  cegger struct device * -> device_t, no functional changes intended.
 1.18  28-Apr-2008  martin branches: 1.18.14;
Remove clause 3 and 4 from TNF licenses
 1.17  14-Apr-2006  blymn branches: 1.17.58; 1.17.60; 1.17.62;
Make i/o statistics collection more generic, include tape drives and
nfs mounts in the set of devices that statistics will be reported on.
 1.16  11-Dec-2005  christos branches: 1.16.4; 1.16.6; 1.16.8; 1.16.10; 1.16.12;
merge ktrace-lwp.
 1.15  15-Oct-2005  yamt - 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)
 1.14  07-Aug-2005  blymn Add tape statistics structure pointer.
 1.13  29-May-2005  christos branches: 1.13.2;
- Sprinkle const
- Avoid variable shadowing.
- Eliminate some caddr_t abuse.
 1.12  01-Feb-2005  reinoud 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.
 1.11  31-Jan-2005  reinoud 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.
 1.10  31-Jan-2005  reinoud As part of cleaning up sys/scsipi, replace all u_char by uint8_t and
replace all `short' with int16_t.
 1.9  27-Aug-2004  bouyer branches: 1.9.4;
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.
 1.8  21-Aug-2004  thorpej Use ANSI function decls and make use of static.
 1.7  21-Aug-2004  thorpej - De-__P.
- Use ANSI function decls.
 1.6  22-Jul-2002  hannken branches: 1.6.6; 1.6.8;
Convert to new device buffer queue interface.
 1.5  20-Mar-2002  christos branches: 1.5.4;
Add the ability to report file number/block number. From Matt Jacob.
 1.4  07-Dec-2001  yamt add detach support for st.
 1.3  01-Dec-2001  bouyer Various quirks for the ATAPI OnStream DI-30, mostly from the FreeBSD driver.
Many thanks to Chris Pinnock for giving me remote access to his hardware.
 1.2  18-Jun-2001  bouyer branches: 1.2.2; 1.2.4;
Snapshot of ATAPI tapes support. Known to be able to read/write to tape with:
st0 at atapibus0 drive 1: <Seagate STT8000A, , 5.51> type 1 sequential
removable
Major changes may still happen in order to properly support other ATAPI
tape drives.
 1.1  04-May-2001  bouyer Add an ATAPI front-end to the st driver. Completely untested for now,
but st at scsi should still work :)
 1.2.4.3  06-Sep-2002  jdolecek sync kqueue branch with HEAD
 1.2.4.2  23-Jun-2002  jdolecek catch up with -current on kqueue branch
 1.2.4.1  10-Jan-2002  thorpej Sync kqueue branch with -current.
 1.2.2.5  01-Aug-2002  nathanw Catch up to -current.
 1.2.2.4  01-Apr-2002  nathanw Catch up to -current.
(CVS: It's not just a program. It's an adventure!)
 1.2.2.3  08-Jan-2002  nathanw Catch up to -current.
 1.2.2.2  21-Jun-2001  nathanw Catch up to -current.
 1.2.2.1  18-Jun-2001  nathanw file stvar.h was added on branch nathanw_sa on 2001-06-21 20:06:07 +0000
 1.5.4.1  29-Aug-2002  gehenna catch up with -current.
 1.6.8.1  11-Sep-2004  he Pull up revision 1.9 (via patch, requested by bouyer in ticket #837):
Improve handling of memory shortage, to fix problems like:
sd3(mpt0:0:1:0): unable to allocate scsipi_xfer
sd3: not queued, error 12
The theory is that other consumers of pool memory is causing
this memory shortage in certain somewhat hard to reproduce
situations.
This is done by giving scsipi_command an extra argument to
optionally pass a preallocated scsipi_xfer, and allocating a
scsipi_xfer before dequeueing a buffer in the various *start()
functions. If the allocation of a scsipi_xfer fails, schedule
a callout for delayed invocation of the start function. Also
reserve one page for scsipi_xfer structs, to ensure that we will
eventually have some available once pending commands complete.
Should fix PR#25670.
 1.6.6.5  10-Nov-2005  skrll Sync with HEAD. Here we go again...
 1.6.6.4  21-Sep-2004  skrll Fix the sync with head I botched.
 1.6.6.3  18-Sep-2004  skrll Sync with HEAD.
 1.6.6.2  03-Sep-2004  skrll Sync with HEAD
 1.6.6.1  25-Aug-2004  skrll Sync with HEAD.
 1.9.4.1  29-Apr-2005  kent sync with -current
 1.13.2.1  21-Jun-2006  yamt sync with head.
 1.16.12.1  24-May-2006  tron Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
 1.16.10.1  19-Apr-2006  elad sync with head.
 1.16.8.1  24-May-2006  yamt sync with head.
 1.16.6.1  22-Apr-2006  simonb Sync with head.
 1.16.4.1  09-Sep-2006  rpaulo sync with head
 1.17.62.4  11-Mar-2010  yamt sync with head
 1.17.62.3  19-Aug-2009  yamt sync with head.
 1.17.62.2  16-May-2009  yamt sync with head
 1.17.62.1  16-May-2008  yamt sync with head.
 1.17.60.1  18-May-2008  yamt sync with head.
 1.17.58.1  02-Jun-2008  mjf Sync with HEAD.
 1.18.14.1  13-May-2009  jym Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.
 1.21.12.1  17-Apr-2012  yamt sync with head
 1.22.2.4  06-Mar-2012  mrg sync to -current
 1.22.2.3  06-Mar-2012  mrg sync to -current
 1.22.2.2  04-Mar-2012  mrg sync to latest -current.
 1.22.2.1  18-Feb-2012  mrg merge to -current.
 1.23.2.1  02-Mar-2012  riz Pull up following revision(s) (requested by mbalmer in ticket #64):
sys/dev/scsipi/stvar.h: revision 1.24
sys/dev/scsipi/st_scsi.c: revision 1.34
sys/dev/scsipi/st_atapi.c: revision 1.28
sys/dev/scsipi/st.c: revision 1.220
Convert st(4) to device_t, while here clean up the code and use uintXX_t
instead of u_intXX_t.
 1.24.16.1  06-Jun-2015  skrll Sync with HEAD
 1.24.2.1  03-Dec-2017  jdolecek update from HEAD
 1.25.16.1  30-Mar-2018  pgoyette Resolve conflicts between branch and HEAD
 1.25.10.1  08-Apr-2018  snj Pull up following revision(s) (requested by mlelstv in ticket #703):
sys/dev/scsipi/st.c: 1.234
sys/dev/scsipi/stvar.h: 1.26
Use separate lock to protect internal state and release locks when
calling biodone.

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