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drm/xe: Create page reclaim list on unbind

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Page reclaim list (PRL) is preparation work for the page reclaim feature.
The PRL is firstly owned by pt_update_ops and all other page reclaim
operations will point back to this PRL. PRL generates its entries during
the unbind page walker, updating the PRL.

This PRL is restricted to a 4K page, so 512 page entries at most.

v2:
 - Removed unused function. (Shuicheng)
 - Compacted warning checking, update commit message,
   spelling, etc. (Shuicheng, Matthew B)
 - Fix kernel docs
 - Moved PRL max entries overflow handling out from
   generate_reclaim_entry to caller (Shuicheng)
 - Add xe_page_reclaim_list_init for clarity. (Matthew B)
 - Modify xe_guc_page_reclaim_entry to use macros
   for greater flexbility. (Matthew B)
 - Add fallback for PTE outside of page reclaim supported
   4K, 64K, 2M pages (Matthew B)
 - Invalidate PRL for early abort page walk.
 - Removed page reclaim related variables from tlb fence
   (Matthew Brost)
 - Remove error handling in *alloc_entries failure. (Matthew B)

v3:
 - Fix NULL pointer dereference check.
 - Modify reclaim_entry to QW and bitfields accordingly. (Matthew B)
 - Add vm_dbg prints for PRL generation and invalidation. (Matthew B)

v4:
 - s/GENMASK/GENMASK_ULL && s/BIT/BIT_ULL (CI)

v5:
 - Addition of xe_page_reclaim_list_is_new() to avoid continuous
   allocation of PRL if consecutive VMAs cause a PRL invalidation.
 - Add xe_page_reclaim_list_valid() helpers for clarity. (Matthew B)
 - Move xe_page_reclaim_list_entries_put in
   xe_page_reclaim_list_invalidate.

Signed-off-by: Brian Nguyen <brian3.nguyen@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Cc: Shuicheng Lin <shuicheng.lin@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20251212213225.3564537-17-brian3.nguyen@intel.com
This commit is contained in:
Brian Nguyen 2025-12-13 05:32:31 +08:00 • committed by Matthew Brost
commit b912138df2
6 changed files with 290 additions and 1 deletions
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