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drm/xe: refactor the paging engine setup

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On newer platforms, the paging configuration is now configured by the PF
via the ADS object, where VF side should ensure that everything
configured as GUC_PAGING_CLASS is correctly mirrored on VF side. For
example PF could in theory reserve two BCS instances, and we expect VF
to mirror that.

With that move towards having a logical mask of all the paging engines,
and also generalise selecting those engines, based on the number of
paging engines. Also cache the first designated paging engine, which
will makes things a little cleaner here, and in later patches.

No functional changes for existing platforms.

v2 (Sashiko):
  - Rework the loop slightly so that we don't needlessly check for the
    paging engine, before we have correctly set the logical instance.
  - Add a proper error return, if we encounter a bogus paging config.
    Thinking ahead to VF where the config is defined by the PF, we
    should just gracefully exit the probe sequence.
v3:
  - Move paging_engines > copy_engines engines check to VF patch.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Francois Dugast <francois.dugast@intel.com>
Link: https://patch.msgid.link/20260626111520.487997-17-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2026-06-26 12:15:26 +01:00
commit 16c8849297
5 changed files with 46 additions and 49 deletions
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