drm/xe/pf: Use migration-friendly doorbells auto-provisioning

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Instead of trying very hard to find the largest fair number of GuC
doorbell IDs that could be allocated for VFs on the current GT, pick
some smaller rounded down to power-of-two value that is more likely
to be provisioned in the same manner by the other PF instance:

  num VFs | num doorbells
  --------+--------------
   63..32 | 4
   31..16 | 8
   15..8  | 16
    7..4  | 32
    3..2  | 64
       1  | 128 (regular PF)
       1  | 240 (admin only PF)

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Link: https://patch.msgid.link/20251105183253.863-3-michal.wajdeczko@intel.com

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Michal Wajdeczko 2025-11-05 19:32:51 +01:00

parent 8fb1d7d3cf

commit bfbcf66186

1 changed files with 17 additions and 0 deletions

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drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c

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