drm/xe/vf: Fix LRC races during post-migration recovery

[kbommu]

Fix races between LRC creation, teardown, and VF post-migration
fixups that can lead to invalid or partially updated LRCs.

Ensure fixups complete before LRCs are used, protect LRC access
during fixups, and recreate any LRCs created while fixups are
in progress.

This prevents inconsistent state and potential GPU hangs.

Signed-off-by: Bommu Krishnaiah krishnaiah.bommu@intel.com

[sys-i915-oscijenkins]

CI Bug Log - changes from xkb-226-520362ff61a16e40d24e7bed21b21463994304b9_BAT -> xkb-pr-main-299-518-df1fc2a61fb8e134270b16d3f355fa630e9fb565_BAT

Summary

SUCCESS

No regressions found.

Participating hosts (9 -> 9)

No changes in participating hosts

Known issues

Here are the changes found in xkb-pr-main-299-518-df1fc2a61fb8e134270b16d3f355fa630e9fb565_BAT that come from known issues:

IGT changes

Issues hit

• igt@xe_eudebug_online@writes-caching-sram-bb-sram-target-vram@drm_xe_engine_class_render0:

  • bat-lnl-1: NOTRUN -> [SKIP][1] (Intel XE#2825 / Intel XE#7430) +1 other test skip
    [1]: https://intel-gfx-ci.01.org/tree/xe-kmd-backports/xkb-pr-main-299-518-df1fc2a61fb8e134270b16d3f355fa630e9fb565/bat-lnl-1/igt@xe_eudebug_online@writes-caching-sram-bb-sram-target-vram@drm_xe_engine_class_render0.html

• igt@xe_eudebug_online@writes-caching-sram-bb-vram-target-sram@drm_xe_engine_class_compute0:

  • bat-lnl-2: NOTRUN -> [SKIP][2] (Intel XE#2825 / Intel XE#7430) +4 other tests skip
    [2]: https://intel-gfx-ci.01.org/tree/xe-kmd-backports/xkb-pr-main-299-518-df1fc2a61fb8e134270b16d3f355fa630e9fb565/bat-lnl-2/igt@xe_eudebug_online@writes-caching-sram-bb-vram-target-sram@drm_xe_engine_class_compute0.html
  • bat-ptl-2: NOTRUN -> [SKIP][3] (Intel XE#6241 / Intel XE#7430) +1 other test skip
    [3]: https://intel-gfx-ci.01.org/tree/xe-kmd-backports/xkb-pr-main-299-518-df1fc2a61fb8e134270b16d3f355fa630e9fb565/bat-ptl-2/igt@xe_eudebug_online@writes-caching-sram-bb-vram-target-sram@drm_xe_engine_class_compute0.html

Possible fixes

• igt@xe_eudebug_online@pagefault-read:
  • bat-ptl-1: [FAIL][4] -> [PASS][5] +1 other test pass
    [4]: https://intel-gfx-ci.01.org/tree/xe-kmd-backports/xkb-226-520362ff61a16e40d24e7bed21b21463994304b9/bat-ptl-1/igt@xe_eudebug_online@pagefault-read.html
    [5]: https://intel-gfx-ci.01.org/tree/xe-kmd-backports/xkb-pr-main-299-518-df1fc2a61fb8e134270b16d3f355fa630e9fb565/bat-ptl-1/igt@xe_eudebug_online@pagefault-read.html

Build changes

• Linux: xkb-226-520362ff61a16e40d24e7bed21b21463994304b9 -> xkb-pr-main-299-518-df1fc2a61fb8e134270b16d3f355fa630e9fb565

igt-xkb-104-c142aab3a: c142aab3a
xkb-226-520362ff61a16e40d24e7bed21b21463994304b9: 520362f
xkb-pr-main-299-518-df1fc2a61fb8e134270b16d3f355fa630e9fb565: df1fc2a