[Bug 106848] [GM45] igt at gem_mmap_gtt@basic-small-bo-tiledx - fail - Failed assertion: memcmp(ptr , tiled_pattern, PAGE_SIZE) == 0 (edit)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106848

--- Comment #14 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Adric Blake from comment #13)
> Okay, so the tiny i915 patch, on drm-tip, does "fix" the issue, at least for
> the 6G config. It might be a different story for the 3G config since it's
> all 32-bit (36-bit?) addressable, from what I can understand. I haven't
> tested it, though.

Interesting. If we could work out the dual-channel portion, we could try and
restrict our physical pages to that portion... But our choice is limit to DM32,
so it'll only work for a few configs.

> The patched IGT test works, but all it does is skip every time. Is that
> intentional? It does that both on a 6G system and a 4G (2G + 2G) system.

Yes. Your system will be reporting that it is using the address of the physical
page as a component in its swizzling, which the igt doesn't take into account
and so its assertions are flawed.

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