refactor the ld(4) DIOCCACHESYNC hook into general ioctl hook, so that attachments
would be able to implement arbitrary other ioctls

Modularize the ld driver and all of its attachments. Ensure that all
parents are capable of rescan (or otherwise provide a means of attaching
children post-initialization).

modify ldattach() to have default strategy as a parameter

Convert sys/dev to use <sys/rndsource.h>.

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 entrop

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.

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Don't pull in the whole uvm(9) API to access only PAGE_SIZE and
some other constants. These are provided by sys/param.h now.

use device_private().
"looks good" ad@
XXX for the device_t/softc split, please check the driver that no cases have been missed.

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

Complete device_t/softc split for the ld(4) attachments. This should
prevent crashes while attaching a drive.

Patch supplied by Juan RP in PR kern/39468.

Add polling support to ld_twe_flush().

Fixes the "cpu_switcho: switching above IPL_SCHED" panic for ld@twe
disks on shutdown in kern/38655.

Remove clause 3 and 4 from TNF licenses

machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

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 whoev

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.

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Don't depend on uvm_extern.h pulling in proc.h.

__unused removal on arguments; approved by core.

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

Use device_parent().

merge ktrace-lwp.

Use aprint_*() instead of printf() at attach time.

move buffer queue related stuffs from buf.h to their own header, bufq.h.

Add a "flush" operation so the array's write cache is flushed on
close and at shutdown.

sprintf -> snprintf

Confirmed; don't need to query stripe size on TwinStor.

- Make CCB allocation slightly more efficient by changing how the
CCB is returned to the caller.
- Make code paths that can use twe_ccb_alloc_wait() use it, and assert
that a CCB is always return

- Make CCB allocation slightly more efficient by changing how the
CCB is returned to the caller.
- Make code paths that can use twe_ccb_alloc_wait() use it, and assert
that a CCB is always returned from that function.
- Assert that a CCB is always returned when allocating the reserved CCB
for an AEN fetch.

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Add support for dynamically attaching and detaching RAID array units.