This series adds new functions to the mmu interval notifier API to allow device drivers with MMUs to dynamically mirror a process' page tables based on device faults and invalidation callbacks. The Nouveau driver is updated to use the extended API and a set of stand alone self tests is added to help validate and maintain correctness.

The patches are based on linux-5.5.0-rc6 and are for Jason's rdma/hmm tree since I believe he is planning some interval notifier changes.

Changes v5 -> v6: Rebase to linux-5.5.0-rc6 Refactored mmu interval notifier patches Converted nouveau to use the new mmu interval notifier API

Changes v4 -> v5: Added mmu interval notifier insert/remove/update callable from the invalidate() callback Updated HMM tests to use the new core interval notifier API

Changes v1 -> v4: https://lore.kernel.org/linux-mm/20191104222141.5173-1-rcampbell@nvidia.com

Ralph Campbell (6): mm/mmu_notifier: add mmu_interval_notifier_insert_safe() mm/mmu_notifier: add mmu_interval_notifier_put() mm/notifier: add mmu_interval_notifier_update() mm/mmu_notifier: add mmu_interval_notifier_find() nouveau: use new mmu interval notifiers mm/hmm/test: add self tests for HMM

MAINTAINERS | 3 + drivers/gpu/drm/nouveau/nouveau_svm.c | 313 ++++-- include/linux/mmu_notifier.h | 29 + lib/Kconfig.debug | 11 + lib/Makefile | 1 + lib/test_hmm.c | 1368 ++++++++++++++++++++++++ mm/mmu_notifier.c | 223 +++- tools/testing/selftests/vm/.gitignore | 1 + tools/testing/selftests/vm/Makefile | 3 + tools/testing/selftests/vm/config | 2 + tools/testing/selftests/vm/hmm-tests.c | 1354 +++++++++++++++++++++++ tools/testing/selftests/vm/run_vmtests | 16 + tools/testing/selftests/vm/test_hmm.sh | 97 ++ 13 files changed, 3289 insertions(+), 132 deletions(-) create mode 100644 lib/test_hmm.c create mode 100644 tools/testing/selftests/vm/hmm-tests.c create mode 100755 tools/testing/selftests/vm/test_hmm.sh