[PATCH 0/3] Elide clear on full SVM copies

[Matthew Brost <matthew.brost@intel.com>]

Clearing a BO whose contents will be fully overwritten immediately afterward
provides little benefit and reduces page-fault and prefetch bandwidth.
Elide the initial clear for SVM-allocated BOs, and only perform a clear in
the copy_to_device vfunc when the CPU pages are not fully populated.

Matt

Matthew Brost (3):
  drm/xe: Add XE_BO_FLAG_SKIP_CLEAR
  drm/xe: Add xe_migrate_clear_vram
  drm/xe: Do not clear SVM device memory allocations up front

 drivers/gpu/drm/xe/xe_bo.c      |   3 +
 drivers/gpu/drm/xe/xe_bo.h      |   1 +
 drivers/gpu/drm/xe/xe_migrate.c |  89 +++++++++++++++++++
 drivers/gpu/drm/xe/xe_migrate.h |   5 ++
 drivers/gpu/drm/xe/xe_svm.c     | 150 ++++++++++++++++++++++++++++++--
 5 files changed, 241 insertions(+), 7 deletions(-)

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2.34.1