26.01.2021 05:45, Mikko Perttunen пишет: >> 5. The hardware state of sync points should be reset when sync point is >> requested, not when host1x driver is initialized. > > This may be doable, but I don't think it is critical for this UAPI, so > let's consider it after this series. > > The userspace should anyway not be able to assume the initial value of > the syncpoint upon allocation. The kernel should set it to some high > value to catch any issues related to wraparound. This is critical because min != max when sync point is requested. > Also, this makes code more complicated since it now needs to ensure all > waits on the syncpoint have completed before freeing the syncpoint, > which can be nontrivial e.g. if the waiter is in a different virtual > machine or some other device connected via PCIe (a real usecase). It sounds to me that these VM sync points should be treated very separately from a generic sync points, don't you think so? Let's not mix them and get the generic sync points usable first.
