kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-10-20 19:23:40 +00:00
Code Issues Releases Packages Activity

drm/xe: Convert the CPU fault handler for exhaustive eviction

Browse source 
The CPU fault handler may populate bos and migrate, and in doing
so might interfere with other tasks validating.

Rework the CPU fault handler completely into a fastpath
and a slowpath. The fastpath trylocks only the validation lock
in read-mode. If that fails, there's a fallback to the
slowpath, where we do a full validation transaction.

This mandates open-coding of bo locking, bo idling and
bo populating, but we still call into TTM for fault
finalizing.

v2:
- Rework the CPU fault handler to actually take part in
  the exhaustive eviction scheme (Matthew Brost).
v3:
- Don't return anything but VM_FAULT_RETRY if we've dropped the
  mmap_lock. Not even if a signal is pending.
- Rebase on gpu_madvise() and split out fault migration.
- Wait for idle after migration.
- Check whether the resource manager uses tts to determine
  whether to map the tt or iomem.
- Add a number of asserts.
- Allow passing a ttm_operation_ctx to xe_bo_migrate() so that
  it's possible to try non-blocking migration.
- Don't fall through to TTM on migration / population error
  Instead remove the gfp_retry_mayfail in mode 2 where we
  must succeed. (Matthew Brost)
v5:
- Don't allow faulting in the imported bo case (Matthew Brost)

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthews Brost <matthew.brost@intel.com>
Link: https://lore.kernel.org/r/20250908101246.65025-7-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström 2025-09-08 12:12:39 +02:00
commit c2ae94cf8c
7 changed files with 225 additions and 51 deletions
Download patch file Download diff file Expand all files Collapse all files