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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #80 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
It is the way of dumping that makes a difference. First and third dump below
are taken by mapping directly using brw_bo_map_gtt(). The second is taken using
intel_miptree_map() which does full batch buffer flush
(_intel_batchbuffer_flush()) before actually mapping the buffer:

6:10 r=40 g=12 b=0 a=255
6:10 r=12 g=0 b=40 a=255
6:10 r=12 g=0 b=40 a=255

In the normal run the batch buffer flush doesn't come between the writing blit
and the reading blit.

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