Intel Xe adds vRAM health checks and page offlining

Queued for Linux 7.4, the Intel Xe driver adds a debug-gated early-probe canary check for the last vRAM page, intended to catch BAR/CCS sizing and identity-map errors. It also adds vRAM page offlining after 21 review rounds, permanently keeping faulty pages out of future allocations and exposing bad ranges through DebugFS. The same pull adds per-engine idle status in DebugFS.

https://www.phoronix.com/news/Intel-Xe-vRAM-Health-Check

Primary patch discussion: https://lore.kernel.org/all/20260902124117.918018-12-matthew.auld@intel.com/