Re: [PATCH 00/10] Add new debug infrastructure for configfs

["Summers, Stuart" <stuart.summers@intel.com>]

I have the test changes for this up on the IGT mailing list:
https://patchwork.freedesktop.org/series/172602/

Thanks,
Stuart

On Thu, 2026-08-20 at 21:06 +0000, Stuart Summers wrote:
> Add a new configfs debug group. The intent of this structure is
> to allow us to separate ABI facing configfs entries from those
> which are purely for debug purposes. And it allows us more
> flexibility
> in how we define those parameters used for debug.
> 
> Add a new infrastructure to this debug configfs group that lets us
> easily define the parameters in a quick list. This is primarily
> useful for simple, single-type parameters such as enable/disable
> features or simple values passed. For more complex parameters,
> we will still need to define these separately.
> 
> Pull the GuC target related changes from [1] to fit within
> this new structure and add a new definition for guc_log_level
> on top of the existing module parameter (to ensure we aren't
> impacting existing users of the module parameter).
> 
> Note that the debug parameters here are all to be used "at your
> own risk". Without having in depth knowledge of how these impact
> the software and hardware, there could be unforeseen consequences
> of setting them. As such, they are all wrapped in a
> CONFIG_DRM_XE_DEBUG configfs option.
> 
> In terms of the patches here, I'm sorting the existing parameters
> by name/type. I know we have a few other module parameters that
> could migrate here, but I didn't want to overload this series
> too much, so the focus for now is on the existing configfs entries
> and demonstrating the new structures with the GuC log level and
> target parameters.
> 
> I used GitHub Copilot with Claude pretty extensively through the
> process here and attributed as such. Happy to answer any questions
> around this. Took a bit of time getting back to this series around
> other work, and in that time I was playing around with a few
> different
> models, hence some of the patches are showing multiple of them. I
> tried to attribute each as I was implementing the changes.
> 
> I also decided to drop John Harrison from the NPK patch. It has
> been modified quite a bit from the original, but more importantly
> John is no longer with Intel and that email address isn't available
> any more. If it makes a difference here, John and I had both
> separately
> implemented this same change at different occasions for debug. The
> one I used to start that initial series was cherry-picked from his
> latest variant.
> 
> v2:
>  - In this second revision I did confirm that the guc_log_level
>    module parameter is taking precedence over the configfs parameter
>    and ensured the other parameters seem to be autogenerating and
>    working as expected.
>  - I tried to address all the review feedback from the first
>    revision, [2].
>  - I also did another pass on the sorting since there were a few
>    discrepancies I noticed in the first revision. I kept Gustavo's
>    R-B on that one, but would like an ack before merging at least
>    to confirm the patch is sane.
>  - And finally I moved the getter functions into the X-macro
>    generators so we can autogenerate more of the similar functions
>    between the different parameters in that debug param list.
> v3:
>  - Address a couple of comments from Sashiko around GuC log level
>    input checking and proper guard implementation.
> v4:
>  - More review feedback from Sashiko addressed...
> v5:
>  - Move the goto to a return (more Sashiko feedback) in the GuC
>    log level setter before moving to the X-macro solution.
> v6:
>  - Make the autogenerated X-macro function names more specific to
>    avoid naming collisions (Sashiko again).
> 
> Stuart Summers (10):
>   drm/xe: Guard configfs attribute reads in getters
>   drm/xe: Sort xe_config_device fields
>   drm/xe: Split out configfs data structures
>   drm/xe: Add a new debug focused configfs group
>   drm/xe: Move debug configfs entries to xe_configfs_debug.c
>   drm/xe/guc: Add configfs support for guc_log_level
>   drm/xe/guc: Add support for NPK as a GuC log target
>   drm/xe: Add infrastructure for debug configfs parameters
>   drm/xe: Migrate existing debug configfs entries to params
>     infrastructure
>   drm/xe: Taint kernel when debug configfs parameters are set
> 
>  drivers/gpu/drm/xe/Makefile                   |    2 +
>  drivers/gpu/drm/xe/abi/guc_log_abi.h          |    8 +
>  drivers/gpu/drm/xe/xe_configfs.c              | 1017 +--------------
> --
>  drivers/gpu/drm/xe/xe_configfs.h              |   90 +-
>  drivers/gpu/drm/xe/xe_configfs_debug.c        |  872 ++++++++++++++
>  drivers/gpu/drm/xe/xe_configfs_debug.h        |   48 +
>  drivers/gpu/drm/xe/xe_configfs_debug_params.c |  158 +++
>  drivers/gpu/drm/xe/xe_configfs_debug_params.h |  194 ++++
>  drivers/gpu/drm/xe/xe_configfs_types.h        |   59 +
>  drivers/gpu/drm/xe/xe_defaults.h              |    5 +
>  drivers/gpu/drm/xe/xe_guc.c                   |   14 +-
>  drivers/gpu/drm/xe/xe_guc_ads.c               |    1 +
>  drivers/gpu/drm/xe/xe_guc_log.c               |    3 +-
>  drivers/gpu/drm/xe/xe_hw_engine.c             |    1 +
>  drivers/gpu/drm/xe/xe_lrc.c                   |    1 +
>  drivers/gpu/drm/xe/xe_pci.c                   |    1 +
>  drivers/gpu/drm/xe/xe_psmi.c                  |    3 +-
>  drivers/gpu/drm/xe/xe_rtp.c                   |    3 +-
>  drivers/gpu/drm/xe/xe_survivability_mode.c    |    1 +
>  19 files changed, 1495 insertions(+), 986 deletions(-)
>  create mode 100644 drivers/gpu/drm/xe/xe_configfs_debug.c
>  create mode 100644 drivers/gpu/drm/xe/xe_configfs_debug.h
>  create mode 100644 drivers/gpu/drm/xe/xe_configfs_debug_params.c
>  create mode 100644 drivers/gpu/drm/xe/xe_configfs_debug_params.h
>  create mode 100644 drivers/gpu/drm/xe/xe_configfs_types.h
>