src/sys/dev/agp, branch release/10.1.0

MFC r258779,r258780,r258787,r258822:

2014-02-04T03:36:42Z

Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this shifts into the sign bit. Instead use (1U << 31) which gets the expected result. Similar to the (1 << 31) case it is not defined to do (2 << 30). This fix is not ideal as it assumes a 32 bit int, but does fix the issue for most cases. A similar change was made in OpenBSD.

Remove the deprecated VM_ALLOC_RETRY flag for the vm_page_grab(9).

2013-08-22T07:39:53Z

The flag was mandatory since r209792, where vm_page_grab(9) was changed to only support the alloc retry semantic. Suggested and reviewed by: alc Sponsored by: The FreeBSD Foundation

The soft and hard busy mechanism rely on the vm object lock to work.

2013-08-09T11:11:11Z

Unify the 2 concept into a real, minimal, sxlock where the shared acquisition represent the soft busy and the exclusive acquisition represent the hard busy. The old VPO_WANTED mechanism becames the hard-path for this new lock and it becomes per-page rather than per-object. The vm_object lock becames an interlock for this functionality: it can be held in both read or write mode. However, if the vm_object lock is held in read mode while acquiring or releasing the busy state, the thread owner cannot make any assumption on the busy state unless it is also busying it. Also: - Add a new flag to directly shared busy pages while vm_page_alloc and vm_page_grab are being executed. This will be very helpful once these functions happen under a read object lock. - Move the swapping sleep into its own per-object flag The KPI is heavilly changed this is why the version is bumped. It is very likely that some VM ports users will need to change their own code. Sponsored by: EMC / Isilon storage division Discussed with: alc Reviewed by: jeff, kib Tested by: gavin, bapt (older version) Tested by: pho, scottl

Switch the vm_object mutex to be a rwlock. This will enable in the

2013-03-09T02:32:23Z

future further optimizations where the vm_object lock will be held in read mode most of the time the page cache resident pool of pages are accessed for reading purposes. The change is mostly mechanical but few notes are reported: * The KPI changes as follow: - VM_OBJECT_LOCK() -> VM_OBJECT_WLOCK() - VM_OBJECT_TRYLOCK() -> VM_OBJECT_TRYWLOCK() - VM_OBJECT_UNLOCK() -> VM_OBJECT_WUNLOCK() - VM_OBJECT_LOCK_ASSERT(MA_OWNED) -> VM_OBJECT_ASSERT_WLOCKED() (in order to avoid visibility of implementation details) - The read-mode operations are added: VM_OBJECT_RLOCK(), VM_OBJECT_TRYRLOCK(), VM_OBJECT_RUNLOCK(), VM_OBJECT_ASSERT_RLOCKED(), VM_OBJECT_ASSERT_LOCKED() * The vm/vm_pager.h namespace pollution avoidance (forcing requiring sys/mutex.h in consumers directly to cater its inlining functions using VM_OBJECT_LOCK()) imposes that all the vm/vm_pager.h consumers now must include also sys/rwlock.h. * zfs requires a quite convoluted fix to include FreeBSD rwlocks into the compat layer because the name clash between FreeBSD and solaris versions must be avoided. At this purpose zfs redefines the vm_object locking functions directly, isolating the FreeBSD components in specific compat stubs. The KPI results heavilly broken by this commit. Thirdy part ports must be updated accordingly (I can think off-hand of VirtualBox, for example). Sponsored by: EMC / Isilon storage division Reviewed by: jeff Reviewed by: pjd (ZFS specific review) Discussed with: alc Tested by: pho

Fix reversed condition in the logic to wait for the chipset buffers

2013-01-27T09:31:11Z

flush wait on the Gen2 chipsets. Confirmed by the inspection of the Linux agp code. Submitted by: Taku YAMAMOTO MFC after: 2 weeks

Remove unneeded semicolons.

2013-01-01T18:16:49Z

Reviewed by: md5 of the object files

Add pci id for the xeon hd4000 (IvyBridge server GT2)

2012-12-11T09:38:12Z

Submitted by: François Tigeot Obtained from: dragonfly MFC after: 3 days

Remove unneeded header from agp: opt_bus.h

2012-11-15T18:49:17Z

Tested with "make universe" Approved by: cperciva MFC after: 1 week

This isn't functionally identical. In some cases a hint to disable

2012-10-22T13:06:09Z

unit 0 would in fact disable all units. This reverts r241856 Approved by: cperciva (implicit)

Now that device disabling is generic, remove extraneous code from the

2012-10-22T03:41:14Z

device drivers that used to provide this feature. Reviewed by: des Approved by: cperciva MFC after: 1 week