Re: ✗ Xe.CI.BAT: failure for drm/xe/wa: Steer RMW of MCR registers while building default LRC

[Matt Roper <matthew.d.roper@intel.com>]

On Fri, Feb 06, 2026 at 11:15:16PM +0000, Patchwork wrote:
> == Series Details ==
> 
> Series: drm/xe/wa: Steer RMW of MCR registers while building default LRC
> URL   : https://patchwork.freedesktop.org/series/161300/
> State : failure
> 
> == Summary ==
> 
> CI Bug Log - changes from xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5_BAT -> xe-pw-161300v1_BAT
> ====================================================
> 
> Summary
> -------
> 
>   **FAILURE**

Hmm, it looks like this is problematic in SRIOV VF environments because
the VF doesn't know how to steer (because it doesn't have access to the
fuse registers that provide the necessary details).  Lack of steering
knowledge usually isn't a problem since the VF also doesn't need to do
any CPU-originated MCR accesses (steered via 0xFD4).  But in this case
to do a CS-originated RMW operation on an MCR register, the ability to
steer properly does become important, and the VF just doesn't have a way
to get the information it needs.

I'm not sure how to fix that gap.  Michal, any thoughts?


Matt

> 
>   Serious unknown changes coming with xe-pw-161300v1_BAT absolutely need to be
>   verified manually.
>   
>   If you think the reported changes have nothing to do with the changes
>   introduced in xe-pw-161300v1_BAT, please notify your bug team (I915-ci-infra@lists.freedesktop.org) to allow them
>   to document this new failure mode, which will reduce false positives in CI.
> 
>   
> 
> Participating hosts (12 -> 11)
> ------------------------------
> 
>   Missing    (1): bat-bmg-3 
> 
> Possible new issues
> -------------------
> 
>   Here are the unknown changes that may have been introduced in xe-pw-161300v1_BAT:
> 
> ### IGT changes ###
> 
> #### Possible regressions ####
> 
>   * igt@sriov_basic@enable-vfs-autoprobe-on:
>     - bat-bmg-2:          [PASS][1] -> [ABORT][2] +1 other test abort
>    [1]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5/bat-bmg-2/igt@sriov_basic@enable-vfs-autoprobe-on.html
>    [2]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-161300v1/bat-bmg-2/igt@sriov_basic@enable-vfs-autoprobe-on.html
> 
>   * igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1:
>     - bat-bmg-1:          [PASS][3] -> [ABORT][4] +1 other test abort
>    [3]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5/bat-bmg-1/igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1.html
>    [4]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-161300v1/bat-bmg-1/igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1.html
>     - bat-atsm-2:         [PASS][5] -> [ABORT][6] +1 other test abort
>    [5]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5/bat-atsm-2/igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1.html
>    [6]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-161300v1/bat-atsm-2/igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1.html
> 
>   
> 
> 
> Build changes
> -------------
> 
>   * Linux: xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5 -> xe-pw-161300v1
> 
>   IGT_8742: 8742
>   xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5: ab5b6da7d4879640bce3197597e0bc707bd60ab5
>   xe-pw-161300v1: 161300v1
> 
> == Logs ==
> 
> For more details see: https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-161300v1/index.html

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation