[Bug 91926] [SKL bisected] texsubimage pbo intermittent failures

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91926

--- Comment #32 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
(In reply to Ben Widawsky from comment #31)
> I wonder why the blit is failing always on SKL. I can't think of anything
> IVB can do that SKL cannot do.

And you are correct. Neither actually fail the blit when doing the texture
upload, the fail comes from elsewhere. I made the same mistake I did before
when interpreting my logs - only this time in both IVB and SKL. I didn't bother
creating special driver hook for only the texture upload path to use but simply
used the general. I assumed the test is simple enough not require blitting
elsewhere - this is not true unfortunately. When I disabled the glsl-blit
option in the driver hook some of these non-tex-upload blits started to fall to
the software path because the blitter couldn't do a format conversion.

Furthermore, the use of blitter engine helps the special of the test I've been
studying on IVB. Full test (original version of the piglit test) fails on both
IVB and SKL with blitter engine. In fact, it looks to fail in more cases than
the glsl blit. I need to look into this some more.

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