[Bug 94110] [sna] corrupted images (horizontal lines)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94110

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm, desktop so you actually want:

commit 5eb3e5a5e11d14f9deb2a4b83555443b69ab9940
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sun Jun 28 09:19:26 2015 +0100

    drm/i915: Declare the swizzling unknown for L-shaped configurations

    The old style of memory interleaving swizzled upto the end of the
    first even bank of memory, and then used the remainder as unswizzled on
    the unpaired bank - i.e. swizzling is not constant for all memory. This
    causes problems when we try to migrate memory and so the kernel prevents
    migration at all when we detect L-shaped inconsistent swizzling.
    However, this issue also extends to userspace who try to manually detile
    into memory as the swizzling for an individual page is unknown (it
    depends on its physical address only known to the kernel), userspace
    cannot correctly swizzle.

    Note that this is a new attempt for the previously merged one,
    reverted in

    commit d82c0ba6e306f079407f07003e53c262d683397b
    Author: Daniel Vetter <daniel.vetter at ffwll.ch>
    Date:   Tue Jul 14 12:29:27 2015 +0200

        Revert "drm/i915: Declare the swizzling unknown for L-shaped
configurations"

    This is cc: stable since we need it to fix up troubles with wc cpu
    mmaps that userspace recently started to use widely.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91105
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
    Cc: stable at vger.kernel.org
    [danvet: Add note about previous (failed attempt).]
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

(same underlying issue)

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