src/sys/dev/twe, branch release/9.3.0

MFC r227293 (by ed):

2013-04-05T08:22:11Z

Mark MALLOC_DEFINEs static that have no corresponding MALLOC_DECLAREs. This means that their use is restricted to a single C file.

MFC 239244,240137,240209:

2013-02-26T18:19:51Z

Add locking to the twe(4) driver and make it MPSAFE.

MFC 232854,232874,232882,232883,232886 for bus_get_dma_tag()

2012-03-16T08:46:58Z

MFC r226173, r227843, r227848 and r227908:

2011-12-31T14:12:12Z

Use DEVMETHOD_END to mark end of device methods. Remove superfluous device methods. Add some missing __FBSBID() macros.

Teach twe driver to report array stripe size to GEOM.

2009-12-25T17:34:43Z

Change the command argument to ioctl routines to u_long to avoid

2009-09-22T16:28:07Z

truncating the command to 32bit on 64bit archs where int is 32bit (ie. amd64). Approved by: scottl Approved by: ed (mentor, implicit)

Temporarily revert the new-bus locking for 8.0 release. It will be

2009-08-20T19:17:53Z

reintroduced after HEAD is reopened for commits by re@. Approved by: re (kib), attilio

Make the newbus subsystem Giant free by adding the new newbus sxlock.

2009-08-02T14:28:40Z

The newbus lock is responsible for protecting newbus internIal structures, device states and devclass flags. It is necessary to hold it when all such datas are accessed. For the other operations, softc locking should ensure enough protection to avoid races. Newbus lock is automatically held when virtual operations on the device and bus are invoked when loading the driver or when the suspend/resume take place. For other 'spourious' operations trying to access/modify the newbus topology, newbus lock needs to be automatically acquired and dropped. For the moment Giant is also acquired in some key point (modules subsystem) in order to avoid problems before the 8.0 release as module handlers could make assumptions about it. This Giant locking should go just after the release happens. Please keep in mind that the public interface can be expanded in order to provide more support, if there are really necessities at some point and also some bugs could arise as long as the patch needs a bit of further testing. Bump __FreeBSD_version in order to reflect the newbus lock introduction. Reviewed by: ed, hps, jhb, imp, mav, scottl No answer by: ariff, thompsa, yongari Tested by: pho, G. Trematerra , Brandon Gooch Sponsored by: Yahoo! Incorporated Approved by: re (ksmith)

We no longer need to use d_thread_t, migrate to struct thread *.

2009-05-20T17:29:21Z

Use si_drv1 instead of dev2unit() in twe(4) and twa(4)

2009-04-14T14:02:43Z

Reviewed by: scottl