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If the user triggers an implicit batch flush while holding access to a CPU mapped buffer, that mmapping will be invalidated by the kernel for non-LLC devices. (The kernel when executing a batch will change the cache domain of the buffers in that batch, which for non-LLC CPU access will cause that buffer to be clflushed and any further CPU access to be discarded.) To prevent this, simply disallow any CPU async mmap access. The cases where async CPU access to a non-LLC buffer should continue to be allowed via their preferred snooping path. v2 (Ken): Reword the comment slightly. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Matt Turner <mattst88@gmail.com> |
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