This series add a flag at VM_BIND time to pin the memory backing a VMA. Initially this is needed for long-running workloads on hardware that neither support mid-thread preemption nor pagefaults, since without it the userptr MMU notifier will wait for preemption until preemption times out. Moving forward this could be supported also for bo-backed VMAs given a proper accounting takes place. A sysadmin could then optionally configure a system to be optimized for dealing with a single GPU application at a time. The series will be followed up with an igt series to exercise the uAPI. Thomas Hellström (4): drm/xe/vm: Use onion unwind for xe_vma_userptr_pin_pages() drm/xe/vm: Implement userptr page pinning drm/xe/vm: Perform accounting of userptr pinned pages drm/xe/uapi: Support pinning of userptr vmas drivers/gpu/drm/xe/xe_vm.c | 181 +++++++++++++++++++++++-------- drivers/gpu/drm/xe/xe_vm.h | 9 ++ drivers/gpu/drm/xe/xe_vm_types.h | 14 +++ include/uapi/drm/xe_drm.h | 18 +++ 4 files changed, 176 insertions(+), 46 deletions(-) -- 2.41.0
