Misc DRM driver uAPI- and feature implementation guidelines

• Asynchronous VM_BIND
  • Nomenclature:
  • Synchronous / Asynchronous VM_BIND operation
    • Synchronous VM_BIND
    • Asynchronous VM_BIND
  • Multi-operation VM_BIND IOCTL error handling and interrupts
  • Example: The Xe VM_BIND uAPI
• VM_BIND locking
  • The DRM GPUVM set of helpers
  • Nomenclature
  • Locks and locking order
  • Protection and lifetime of gpu_vm_bos and gpu_vmas
  • Revalidation and eviction of local objects
    • Revalidation
    • Eviction
  • Locking with external buffer objects
  • Accessing the gpu_vm's lists without the dma_resv lock held
  • userptr gpu_vmas
    • Efficient userptr gpu_vma exec_function iteration
  • Locking at bind and unbind time
  • Locking for recoverable page-fault page-table updates