[PATCH igt v6 5/6] tests: Add kms_mmap_write_crc for cache coherency tests

2015-12-17 Thread Chris Wilson
On Wed, Dec 16, 2015 at 08:25:42PM -0200, Tiago Vignatti wrote: > This program can be used to detect when CPU writes in the dma-buf mapped > object > don't land in scanout due cache incoherency. > > Although this seems a problem inherently of non-LCC machines ("Atom"), this > particular test catc

[PATCH igt v6 5/6] tests: Add kms_mmap_write_crc for cache coherency tests

2015-12-16 Thread Tiago Vignatti
This program can be used to detect when CPU writes in the dma-buf mapped object don't land in scanout due cache incoherency. Although this seems a problem inherently of non-LCC machines ("Atom"), this particular test catches a cache dirt on scanout on LLC machines as well. It's inspired in Ville's