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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>
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2 changed files with 7 additions and 0 deletions
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@ -458,6 +458,7 @@ i915_gem_get_tiling(struct drm_device *dev, void *data,
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}
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/* Hide bit 17 from the user -- see comment in i915_gem_set_tiling */
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args->phys_swizzle_mode = args->swizzle_mode;
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if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_17)
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args->swizzle_mode = I915_BIT_6_SWIZZLE_9;
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if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_10_17)
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@ -876,6 +876,12 @@ struct drm_i915_gem_get_tiling {
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* mmap mapping.
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*/
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__u32 swizzle_mode;
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/**
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* Returned address bit 6 swizzling required for CPU access through
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* mmap mapping whilst bound.
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*/
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__u32 phys_swizzle_mode;
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};
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struct drm_i915_gem_get_aperture {
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