of pipe number.

Handle relative as well as absolute target sequence numbers.

Return error if target sequence has already passed, so userspace can deal with
this situation as it sees fit.

On success, return the sequence number of the vertical blank when the buffer
swap is expected to take place.

Also add DRM_IOCTL_I915_VBLANK_SWAP definition for userspace code that may want
to use ioctl() instead of drmCommandWriteRead().
Signed-off-by: NDave Airlie <airlied@linux.ie>

This uses the core facility to schedule a driver callback that will be called
ASAP after the given vertical blank interrupt with the HW lock held.
Signed-off-by: NDave Airlie <airlied@linux.ie>

When the vertical blank interrupt is enabled for both pipes, pipe A is
considered primary and pipe B secondary. When it's only enabled for one pipe,
it's always considered primary for backwards compatibility.
Signed-off-by: NDave Airlie <airlied@linux.ie>

This is a patch prepared by Guangdeng Liao based off of Tungsten Graphics's
final code drop.

From: Alan Hourihane <alanh@tungstengraphics.com>
Signed-off-by: NDave Airlie <airlied@linux.ie>

i915 vblanks can be generated from either pipe a or b, however a disabled
pipe generates no interrupts. This change allows the X server to select
which pipe generates vblank interrupts.

From: Keith Packard <keith.packard@intel.com> via DRM CVS
Signed-off-by: NDave Airlie <airlied@linux.ie>

From: Keith Whitwell <keithw@tungstengraphics.com>
Signed-off-by: NDave Airlie <airlied@linux.ie>

Fixes: IRQ disabled (i915?) when switchig between gnome themes (gnome-theme-manager)
Signed-off-by: NDave Airlie <airlied@linux.ie>

Add support for vblank ioctls to i915 driver

From: Dave Airlie <airlied@linux.ie>
Signed-off-by: NDave Airlie <airlied@linux.ie>

This patch contains the following cleanups:
- make needlessly global functions static
- remove the following unused global functions:
 - drm_fops.c: drm_read
 - i915_dma.c: i915_do_cleanup_pageflip
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Signed-off-by: NDave Airlie <airlied@linux.ie>

From: Alan Hourihane
Signed-off-by: NDavid Airlie <airlied@linux.ie>

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!