[PATCH 0/3] dma-debug: skip irrelevant buckets for partial syncs

[Juanlu Herrero]

Make the ZCRX area size configurable, skip DMA debug buckets that cannot
contain a partial sync, and add KUnit coverage for bucket bounds.

Earlier Fastio ZCRX registration means with DMA debug enabled:

  driver   pages    before     after      time saved
  mlx5      65536   4.720 s    0.942 s     3.778 s
  bnxt_en  131072  10.658 s    0.556 s    10.102 s

These runs used an earlier patch revision and workload. Later
SG-controlled CX7 runs showed no overall registration gain.

Validation: KUnit with KASAN/lockdep, W=1 build and checkpatch passed.

Codex assisted with implementation, review and validation.

Signed-off-by: Juanlu Herrero <juanlu@xxxxxxxxxxxx>
---
Juanlu Herrero (3):
      selftests: net: make iou-zcrx area size configurable
      dma-debug: skip irrelevant buckets for partial syncs
      dma-debug: add bucket bound lifetime coverage

 kernel/dma/Kconfig                                | 10 ++++
 kernel/dma/debug.c                                | 53 +++++++++++++++++----
 kernel/dma/tests/debug_kunit.c                    | 57 +++++++++++++++++++++++
 tools/testing/selftests/drivers/net/hw/iou-zcrx.c | 33 ++++++++++---
 4 files changed, 137 insertions(+), 16 deletions(-)
---
base-commit: 8ec20f45bd96cdc4c0faff4a6868aae52fab3827
change-id: 20261027-zcrx-dma-debug-registration-03221ef6a7d4

Best regards,
-- 
Juanlu Herrero