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* [PATCH v6 0/5] Use new dma-map IOVA alloc, link, and sync API in GPU SVM and DRM pagemap
@ 2026-04-08 20:15 Matthew Brost
  2026-04-08 20:15 ` [PATCH v6 1/5] drm/gpusvm: Use dma-map IOVA alloc, link, and sync API in GPU SVM Matthew Brost
                   ` (5 more replies)
  0 siblings, 6 replies; 9+ messages in thread
From: Matthew Brost @ 2026-04-08 20:15 UTC (permalink / raw)
  To: intel-xe, dri-devel, francois.dugast

The dma-map IOVA alloc, link, and sync APIs perform significantly better
than dma-map / dma-unmap, as they avoid costly IOMMU synchronizations.
This difference is especially noticeable when mapping a 2MB region in
4KB pages.

Use dma-map IOVA alloc, link, and sync APIs for GPU SVM and DRM page,
which mappings between the CPU and GPU.

Initial results are promising.

Baseline CPU time during 2M / 64K fault with a migration (device THP disabled):
Average migrate 2M cpu time (us, percentage): 333.99665178571428571429, .61102853199282922865
Average migrate 64K cpu time (us, percentage): 18.62723214285714285714, .30127985269960467173

After this series CPU time during 2M / 64K fault with a migration (device THP disabled):
Average migrate 2M cpu time (us, percentage): 224.81808035714285714286, .51412827364772602557
Average migrate 64K cpu time (us, percentage): 14.65625000000000000000, .25659463050529524405

Matt

v2:
 - Include missing basline patch for CI
v3:
 - Fix memory corruption
 - PoC IOVA alloc for multi-GPU
v4:
 - Pack IOVA / drop dummy pages
 - Drop multi-GPU IOVA alloc
v5:
 - Address Thomas's comments
v6:
 - Address Francois's comments

Matthew Brost (5):
  drm/gpusvm: Use dma-map IOVA alloc, link, and sync API in GPU SVM
  drm/pagemap: Drop source_peer_migrates flag and assume true
  drm/pagemap: Split drm_pagemap_migrate_map_pages into device / system
  drm/pagemap: Use dma-map IOVA alloc, link, and sync API for DRM
    pagemap
  drm/pagemap: Fix drm_pagemap_migrate_unmap_pages kerneldoc

 drivers/gpu/drm/drm_gpusvm.c  |  55 ++++++--
 drivers/gpu/drm/drm_pagemap.c | 229 ++++++++++++++++++++++++----------
 drivers/gpu/drm/xe/xe_svm.c   |   1 -
 include/drm/drm_gpusvm.h      |   5 +
 include/drm/drm_pagemap.h     |   9 +-
 5 files changed, 220 insertions(+), 79 deletions(-)

-- 
2.34.1


^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2026-04-10 16:09 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-04-08 20:15 [PATCH v6 0/5] Use new dma-map IOVA alloc, link, and sync API in GPU SVM and DRM pagemap Matthew Brost
2026-04-08 20:15 ` [PATCH v6 1/5] drm/gpusvm: Use dma-map IOVA alloc, link, and sync API in GPU SVM Matthew Brost
2026-04-08 20:15 ` [PATCH v6 2/5] drm/pagemap: Drop source_peer_migrates flag and assume true Matthew Brost
2026-04-08 20:15 ` [PATCH v6 3/5] drm/pagemap: Split drm_pagemap_migrate_map_pages into device / system Matthew Brost
2026-04-08 20:15 ` [PATCH v6 4/5] drm/pagemap: Use dma-map IOVA alloc, link, and sync API for DRM pagemap Matthew Brost
2026-04-10 16:08   ` Francois Dugast
2026-04-08 20:15 ` [PATCH v6 5/5] drm/pagemap: Fix drm_pagemap_migrate_unmap_pages kerneldoc Matthew Brost
2026-04-09  9:58   ` Francois Dugast
2026-04-08 20:23 ` ✗ CI.KUnit: failure for Use new dma-map IOVA alloc, link, and sync API in GPU SVM and DRM pagemap (rev6) Patchwork

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