4961700c10
Summary: One of the main disadvantages to using the RPC interface is that it requires a server thread to spin on the mailboxes checking for work. The vast majority of the time, there will be no work and work will come in large bursts. The HSA / KFD interface supports device-side interrupts and already has handling for binding these events to an HSA signal. This means that we can send interrupts from the GPU to wake a sleeping thread on the CPU. The sleeping thread will be descheduled with a blocking HSA wait call and woken up when its event ID is raised through the kernel driver's interrupt. This is very target-specific handling, but I believe it is valuable enough to warrant it being in the protocol. It is completely optional, as it is ignored if uninitialized. This should bring this support at parity with the interface HIP expects.
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