GPU PAGE-TABLE TREE WALKING.(9)

💅 GPU page-table tree walking 💅

okay so bestie, welcome to the GPU page-tab...ree walking.(9) page from the Kernel API Manual — this is the one about GPU page-table tree walking, and it's lowkey iconic ✨🦋

🌸 DESCRIPTION 🌸

The utilities in this file are similar to the CPU page-table walk utilities in mm/pagewalk.c — same energy, different tree 🌈. The main difference? We distinguish the various levels of a page-table tree with an unsigned integer rather than by name. 0 is the lowest level, and page-tables with level 0 can not be directories pointing to lower levels, whereas all other levels can 👑. The user of the utilities determines the highest level, so that's your call, bestie 🫶 periodt.

Nomenclature: each struct xe_ptw, regardless of level, is referred to as a page table 💅. Multiple page tables typically form a page table tree, with page tables at intermediate levels being page directories pointing at page tables at lower levels 🧚. A shared page table for a given address range is a page-table which is neither fully within nor fully outside the address range and that can thus be shared by two or more address ranges — it's giving "I belong to everybody and nobody" 😭✨.

Please keep this code generic so that it can be used as a drm-wide page-table walker should other drivers find use for it — fr fr, think future main character energy 👑💖.

👀 SEE ALSO 👀

• Kernel file ./drivers/gpu/drm/xe/xe_pt_walk.c
• xe_pt_walk_range(9)
• xe_pt_walk_shared(9)

mwah 💋 that's the whole vibe. this page comes from ./drivers/gpu/drm/xe and is dated October 2026 — screenshot it, cite it, slay it 🎀🫶💜