drm/xe: Add compact-PT and addr mask handling for page reclaim

Current implementation of generate_reclaim_entry() overlooks some
differences between the different page implementations: address masking
and compact 64K page handling.

Address masking of each leaf varies depending on the leaf entry size.
generate_reclaim_entry() is using XE_PTE_ADDR_MASK [51:12] for all leaf
entries. For 2MB PTEs, bit 12 (PAT) is part of the flags so the old mask
corrupts the physical address extraction.

64K pages can be represented as PS64 and a compact PT, which the latter
was not handled. Compact pages aren't walked by the unbind walker, so we
separately walk through the compact PT to ensure none of the leaf 64K
PTEs are dropped. Previously, compact PT were causing an abort since it
was considered covered and not descended into.

v2:
 - Update 64K entry/unbind walker for 64K compact PT handling. (Matthew)
 - Rework calculations of reclamation and address mask size.
 - Add new func abstracting the error handling before generating the
   reclaim entry.

v3:
 - Report finer addr granularity in abort debug print for compact.
   (Zongyao)
 - Add comments for ADDR_MASK usage. (Zongyao)
 - Drop existing phys_addr asserts, the new XE_PAGE_ADDR_MASK clears
   bits checked, so redundant asserts. (Sashiko)
 - WARN_ON to verify compact pt and edge pt won't be possible.

Fixes: b912138df299 ("drm/xe: Create page reclaim list on unbind")
Assisted-by: Sashiko-Review:gemini-3.1-pro-preview
Cc: stable@vger.kernel.org
Cc: Matthew Auld <matthew.auld@intel.com>
Suggested-by: Zongyao Bai <zongyao.bai@intel.com>
Signed-off-by: Brian Nguyen <brian3.nguyen@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Zongyao Bai <zongyao.bai@intel.com>
Link: https://patch.msgid.link/20260605224257.2194194-2-brian3.nguyen@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
(cherry picked from commit 669252801a4aa4098fbc5dd9dd0bd93f0625abd7)
Signed-off-by: Matthew Brost <matthew.brost@intel.com>

0 files changed, 0 insertions, 0 deletions