Hi, Is that possible to have user mapping cached in Memory Mapping mode ? This means buffer allocated by mmap in userspace, will have cache support, and it will be faster to work on it. But how the cache coherency can be done ? For a camera we should : - invalidate cache before dma operation (to have not old buffer data in the cache) - forbid the user to access the buffer during the dma operation (to not pollute the cache) Is it possible ? How can we achieve that ? I see sync method, that seems only called after frame capture ? Or user "User Pointers" is the solution ? But they should have the same problems. Is there some documentation of how "user pointer" are synchronised with dma ? Thanks, Matthieu -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
