[Bug 38800] glXSwapBuffersMscOML is slow on AMD Fusion but not on Intel 945 w/Atom

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38800

--- Comment #30 from Jerome Glisse <glisse at freedesktop.org> 2011-07-07 06:36:38 PDT ---
This flip stuff is hairy. I think best is :

flip ioctl:
- pin new front
- delay work to bo fence (if no fence use the oldest alive fence)
- return

fence handler:
- on flip work wait for outside vblank
- write reg

irq handler:
- report timestamp + cleanup (unpin old front)

So wait for bo to be idle before waiting to be out of vblank

Note that as long as we don't introduce new ioctl we can't properly handle the
case where reminder != 0 in the oml extension

"
 if the current MSC is greater than or equal to <target_msc>, the
 buffer swap will occur the next time the MSC value is incremented
 to a value such that MSC % <divisor> = <remainder>. If <divisor> = 0,
 the swap will occur when MSC becomes greater than or equal to
 <target_msc>.
"

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