drm/i915: Report the actual swizzling back to userspace

Userspace cares about whether or not swizzling depends on the page
address for its direct access into bound objects. Extend the get_tiling
ioctl to report the physical swizzling value in addition to the logical
swizzling value so that userspace can accurately determine when it is
possible for manual detiling.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Akash Goel <akash.goel@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Testcase: igt/gem_tiled_wc
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index ff57f07c3249..2ec0efcaa719 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -876,6 +876,12 @@ struct drm_i915_gem_get_tiling {
          * mmap mapping.
          */
         __u32 swizzle_mode;
+
+        /**
+         * Returned address bit 6 swizzling required for CPU access through
+         * mmap mapping whilst bound.
+         */
+        __u32 phys_swizzle_mode;
 };
 
 struct drm_i915_gem_get_aperture {