habanalabs: handle the h/w sync object
Define a structure representing the h/w sync object (SOB). a SOB can contain up to 2^15 values. Each signal CS will increment the SOB by 1, so after some time we will reach the maximum number the SOB can represent. When that happens, the driver needs to move to a different SOB for the signal operation. A SOB can be in 1 of 4 states: 1. Working state with value < 2^15 2. We reached a value of 2^15, but the signal operations weren't completed yet OR there are pending waits on this signal. For the next submission, the driver will move to another SOB. 3. ALL the signal operations on the SOB have finished AND there are no more pending waits on the SOB AND we reached a value of 2^15 (This basically means the refcnt of the SOB is 0 - see explanation below). When that happens, the driver can clear the SOB by simply doing WREG32 0 to it and set the refcnt back to 1. 4. The SOB is cleared and can be used next time by the driver when it needs to reuse an SOB. Per SOB, the driver will maintain a single refcnt, that will be initialized to 1. When a signal or wait operation on this SOB is submitted to the PQ, the refcnt will be incremented. When a signal or wait operation on this SOB completes, the refcnt will be decremented. After the submission of the signal operation that increments the SOB to a value of 2^15, the refcnt is also decremented. Signed-off-by: Omer Shpigelman <oshpigelman@habana.ai> Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com> Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
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