vk: Fix cyclic read-write in dma_block::load/flush #9818
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Some DMA block entries are stubs whose parents are DMA_block_EXT entries. Performing load() in this case becomes a memcpy(address, same_address_again, length) which wastes performance and introduces bugs.
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Some DMA block entries are stubs whose parents are DMA_block_EXT entries. Performing load() in this case becomes a memcpy(address, same_address_again, length) which wastes performance and introduces bugs.
Improves performance when using passthrough DMA. I've only tested on an AMD GPU, NV GPUs have other more complicated issues with passthrough that are still being worked on behind the scenes.