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ntel-gpu-tools/tests/gem_tiled_wc
Chris Wilson c45216b26d igt/gem_tiled_wb: Exercise CPU mmaps with swizzling 
This exercises the the extended get_tiling ioctl in order to determine
proper swizzling for direct access to objects through WB.
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.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
2014-11-04 12:09:26 +00:00

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