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Create device nodes for user-created scheduling domains. This helps leverage filesystem based access control: domains can be chosen to be available for a limited set of users on a system. The device nodes are dynamic: they can be removed while the driver is running normally. This is a bit different from the nodes that exist until the driver is unloaded, so the devno/domain mapping is stored in a separate list. The usual container_of pattern would suffer from an unavoidable race condition if a domain file was opened while the same domain would get removed. As usual, domain refcounting prevents a domain from being removed. Now the open device files hold refs and thus any open domain files prevent a domain from getting removed, in addition to the userspace-invisible ref that is taken when a TSG is bound to a domain. While at it, make the query ioctl guarded by the sched domain mutex, as domains might technically get added or removed during the querying code. Jira NVGPU-6788 Change-Id: Ief2a09a442c4e70f1f2be8a32359341071d74659 Signed-off-by: Konsta Hölttä <kholtta@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2651164 Reviewed-by: Alex Waterman <alexw@nvidia.com> GVS: Gerrit_Virtual_Submit