Faith Ekstrand
f49a3e0a68
This change has two main advantages. First is that the previous code had a subtle bug where state updates would drop the previous state pushbuf without first guaranteeing that the queue was idle, potentially leading to a fault. This worked when I first wrote the code because we were using the old nouveau UAPI which took a list of BOs on each submit and the kernel would interanlly reference count them. With the modern UAPI, there is no such safety net. The second effect of this commit is that we're now only submitting the pushbuf when one of the pointers or ranges actually changes. This should hopefully reduce GPU stalling as setting those pointers is a pretty heavy-weight operation. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30596>
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