On 10.03.2023 10:23, Andrzej Hajda wrote:
This patch tries to diminish plague of DMAR read errors present in CI for ADL*, RPL*, DG2 platforms, see for example [1] (grep DMAR). CI is usually tolerant for these errors, so the scale of the problem is not really visible. To show it I have counted lines containing DMAR read errors in dmesgs produced by CI for all three versions of the patch, but in contrast to v2 I have grepped only for lines containing "PTE Read access". Below stats for kernel w/o patchset vs patched one. v1: 210 vs 0 v2: 201 vs 0 v3: 214 vs 0 Apparently the patchset fixes all common PTE read errors.Changelog: v2: - modified commit message (I hope the diagnosis is correct), - added bug checks to ensure scratch is initialized on gen3 platforms. CI produces strange stacktrace for it suggesting scratch[0] is NULL, to be removed after resolving the issue with gen3 platforms. v3: - removed bug checks, replaced with gen check. v4: - change code for scratch page insertion to support all platforms, - add info in commit message there could be more similar issues v5: - changed to patchset adding nop_clear_range related code, - re-insert scratch PTEs on resume v6: - use scratch_range To: Jani Nikula <[email protected]> To: Joonas Lahtinen <[email protected]> To: Rodrigo Vivi <[email protected]> To: Tvrtko Ursulin <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: Andi Shyti <[email protected]> Cc: Chris Wilson <[email protected]> Cc: Nirmoy Das <[email protected]> Signed-off-by: Andrzej Hajda <[email protected]>
Queued to drm-intel-gt-next Regards Andrzej
--- - Link to v5: https://lore.kernel.org/r/[email protected] --- Andrzej Hajda (2): drm/i915/gt: introduce vm->scratch_range callback drm/i915: add guard page to ggtt->error_capture drivers/gpu/drm/i915/gt/intel_ggtt.c | 43 ++++++++++++++++++++++++++++--- drivers/gpu/drm/i915/gt/intel_ggtt_gmch.c | 1 + drivers/gpu/drm/i915/gt/intel_gtt.h | 2 ++ 3 files changed, 42 insertions(+), 4 deletions(-) --- base-commit: 3cd6c251f39c14df9ab711e3eb56e703b359ff54 change-id: 20230308-guard_error_capture-f3f334eec85f Best regards,
