It helps when testing whether tiled data read back through a linear
mmaping to first tile the data. And not repeatedly unmapping the linear
map stops it from segfaulting.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88686
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This exercises both the wc mmappings and the extended get_tiling ioctl.
Userspace cannot handle bit17 swizzling through wc mmaps (because bit17
requires swizzling based on the actual physical address of the page -
which is unknown to userspace) and so we need an extended get_tiling
ioctl to report the actual as well as the logical swizzling on an
object. We then check that the contents of the object are tiled and
swizzled correctly when viewed through a wc mmap.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
