This small fixup series applies on top of:
[PATCH v8 0/8] mm/hmm: Add mmap lock-drop support for userfaultfd-backed
mappings
The first patch updates the HMM documentation example to make the
mmu_interval_read_retry() state explicit: callers should use the notifier and
notifier_seq stored in the same hmm_range that was passed to
hmm_range_fault_unlocked_timeout().
The remaining patches adjust nouveau, amdxdna, and drm_gpusvm users so the
timeout passed to hmm_range_fault_unlocked_timeout() is treated as a relative
HMM retry budget. These callers no longer keep an absolute deadline around
their outer driver retry loops or pass a computed remaining time into HMM.
This keeps the timeout scoped to HMM's internal mmu-notifier retry handling. If
HMM succeeds and the driver later observes an invalidation through
mmu_interval_read_retry(), the driver retries the operation with a fresh HMM
retry budget.
Changes in v2:
- Kept the nouveau outer absolute timeout around the
mmu_interval_read_retry() loop. hmm_range_fault_unlocked_timeout() only
bounds HMM’s internal retries, while nouveau faults are handled from a GPU
fault worker, so userspace fatal signals cannot break an endless stream of
invalidations there.
- Updated nouveau to use time_after_eq() before calling HMM, so the remaining
timeout passed to hmm_range_fault_unlocked_timeout() is always positive and
never 0, which would mean retry indefinitely.
- Updated the nouveau fixup commit message to explain the worker-thread
timeout issue and the time_after_eq() boundary behavior.
- Fixed the amdxdna fixup commit message. It now describes
aie2_populate_range() correctly instead of carrying stale nouveau prose,
and notes that command submission still keeps its broader timeout while HMM
gets a fresh relative retry budget.
---
Stanislav Kinsburskii (4):
fixup! mm/hmm: add hmm_range_fault_unlocked_timeout() for mmap lock-drop
support
fixup! drm/nouveau: use hmm_range_fault_unlocked_timeout() for SVM faults
fixup! accel/amdxdna: use hmm_range_fault_unlocked_timeout() for range
population
fixup! drm/gpusvm: use hmm_range_fault_unlocked_timeout() for range faults
Documentation/mm/hmm.rst | 5 +++--
drivers/accel/amdxdna/aie2_ctx.c | 12 ++++--------
drivers/gpu/drm/drm_gpusvm.c | 21 ++++++---------------
drivers/gpu/drm/nouveau/nouveau_svm.c | 14 ++++++++++----
4 files changed, 23 insertions(+), 29 deletions(-)
