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The PCI MMU cache is two layered. The upper layer, memcache, uses cache lines, the bottom layer doesn't. Hence, after PMMU map operation we have to invalidate memcache, to avoid the situation where the new entry is already in the cache due to its cache line being fully in the cache. However, we do not have to invalidate the lower cache, and here we can optimize, since cache invalidation is time consuming. Signed-off-by: Yuri Nudelman <ynudelman@habana.ai> Reviewed-by: Oded Gabbay <ogabbay@kernel.org> Signed-off-by: Oded Gabbay <ogabbay@kernel.org> |
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