drm/i915: Write GPU relocs harder with gen3
Under moderate amounts of GPU stress, we can observe on Bearlake and Pineview (later gen3 models) that we execute the following batch buffer before the write into the batch is coherent. Adding extra (tested with upto 32x) MI_FLUSH to either the invalidation, flush or both phases does not solve the incoherency issue with the relocations, but emitting the MI_STORE_DWORD_IMM twice does. So be it. Fixes: 7dd4f672 ("drm/i915: Async GPU relocation processing") Testcase: igt/gem_tiled_fence_blits # blb/pnv Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by:
Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181119154153.15327-1-chris@chris-wilson.co.uk (cherry picked from commit 7fa28e14 ) Signed-off-by:
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
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8830f26b
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