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Justin T. Gibbs 283d6f7287 Monitor and emit events for XenStore changes to XenBus trees 
of the devices we manage.  These changes can be due to writes
we make ourselves or due to changes made by the control domain.
The goal of these changes is to insure that all state transitions
can be detected regardless of their source and to allow common
device policies (e.g. "onlined" backend devices) to be centralized
in the XenBus bus code.

sys/xen/xenbus/xenbusvar.h:
sys/xen/xenbus/xenbus.c:
sys/xen/xenbus/xenbus_if.m:
	Add a new method for XenBus drivers "localend_changed".
	This method is invoked whenever a write is detected to
	a device's XenBus tree.  The default implementation of
	this method is a no-op.

sys/xen/xenbus/xenbus_if.m:
sys/dev/xen/netfront/netfront.c:
sys/dev/xen/blkfront/blkfront.c:
sys/dev/xen/blkback/blkback.c:
	Change the signature of the "otherend_changed" method.
	This notification cannot fail, so it should return void.

sys/xen/xenbus/xenbusb_back.c:
	Add "online" device handling to the XenBus Back Bus
	support code.  An online backend device remains active
	after a front-end detaches as a reconnect is expected
	to occur in the near future.

sys/xen/interface/io/xenbus.h:
	Add comment block further explaining the meaning and
	driver responsibilities associated with the XenBus
	Closed state.

sys/xen/xenbus/xenbusb.c:
sys/xen/xenbus/xenbusb.h:
sys/xen/xenbus/xenbusb_back.c:
sys/xen/xenbus/xenbusb_front.c:
sys/xen/xenbus/xenbusb_if.m:
	o Register a XenStore watch against the local XenBus tree
	  for all devices.
	o Cache the string length of the path to our local tree.
	o Allow the xenbus front and back drivers to hook/filter both
	  local and otherend watch processing.
	o Update the device ivar version of "state" when we detect
	  a XenStore update of that node.

sys/dev/xen/control/control.c:
sys/xen/xenbus/xenbus.c:
sys/xen/xenbus/xenbusb.c:
sys/xen/xenbus/xenbusb.h:
sys/xen/xenbus/xenbusvar.h:
sys/xen/xenstore/xenstorevar.h:
	Allow clients of the XenStore watch mechanism to attach
	a single uintptr_t worth of client data to the watch.
	This removes the need to carefully place client watch
	data within enclosing objects so that a cast or offsetof
	calculation can be used to convert from watch to enclosing
	object.

Sponsored by:	Spectra Logic Corporation
MFC after:	1 week
2011-06-11 04:59:01 +00:00
..
evtchn Add xenpic_dynirq_disable_intr and set it as the .pic_disable_intr method 2010-12-30 01:28:56 +00:00
interface Monitor and emit events for XenStore changes to XenBus trees 2011-06-11 04:59:01 +00:00
xenbus Monitor and emit events for XenStore changes to XenBus trees 2011-06-11 04:59:01 +00:00
xenstore Monitor and emit events for XenStore changes to XenBus trees 2011-06-11 04:59:01 +00:00
blkif.h Improve the Xen para-virtualized device infrastructure of FreeBSD: 2010-10-19 20:53:30 +00:00
evtchn.h merge 186535, 186537, and 186538 from releng_7_xen 2008-12-29 06:31:03 +00:00
features.c Merge in support for Xen HVM on amd64 architecture. 2009-03-11 15:30:12 +00:00
features.h Merge in support for Xen HVM on amd64 architecture. 2009-03-11 15:30:12 +00:00
gnttab.c Improve the Xen para-virtualized device infrastructure of FreeBSD: 2010-10-19 20:53:30 +00:00
gnttab.h Improve the Xen para-virtualized device infrastructure of FreeBSD: 2010-10-19 20:53:30 +00:00
hypervisor.h Merge in support for Xen HVM on amd64 architecture. 2009-03-11 15:30:12 +00:00
xen_intr.h Improve the Xen para-virtualized device infrastructure of FreeBSD: 2010-10-19 20:53:30 +00:00