xe_pt_stage_unbind(9)

📦 version 7.3.1, in nixpkgs unstable

💅 xe_pt_stage_unbind (kernel api manual, bestie)

okay so real talk — welcome to the xe_pt_stage_unbind(9) page, straight out of the Linux Kernel API Manual. yes she's a kernel function page, yes she's kind of a lot, and yes i'm gonna walk you through every single line of her because nothing here is skippable. 🎀

✨ NAME ✨

xe_pt_stage_unbind — builds page-table update structures for an unbind operation. that's the whole vibe. it stages, it unbinds, it builds structures. iconic behavior honestly. 💅

🌸 SYNOPSIS 🌸

literally the whole signature, not one character changed, copy it into your notes bestie:

unsigned int xe_pt_stage_unbind (struct xe_tile *tile , struct xe_vm *vm
, struct xe_vma *vma , struct xe_svm_range *range , struct
xe_vm_pgtable_update *entries );

five args, returns an unsigned int, no cap. 🫶

🦋 ARGUMENTS 🦋

  • tile — the tile we're unbinding for. that's her. that's the tile.
  • vm — the vm. short and sweet, she speaks for herself.
  • vma — the vma we're unbinding. yes, the actual one.
  • range — the range we're unbinding. also the actual one. we stay specific here.
  • entries — caller-provided storage for the update structures. so like, you bring the storage, the function fills it. you're the storage benefactor. main character energy honestly. 🧚

🔥 DESCRIPTION 🔥

okay so here's what she does: xe_pt_stage_unbind builds page-table update structures for an unbind operation. that's the job. that's the assignment and she ate.

and here's the part you cannot skip, bestie, because it's a real technical caveat and i need you to hear it: the function will attempt to remove all page-tables that we're the only user of, and for that to work, the unbind operation must be committed in the same critical section that blocks racing binds to the same page-table tree.

read that again. same critical section. no vibes-based locking, no "it'll probably be fine" — if you don't commit it in that same critical section, the whole remove-all-the-page-tables-we-alone-own thing doesn't work. lowkey this is the most important sentence on the page. 😭

bestie this is a correctness thing, not a suggestion. same critical section that blocks racing binds to the same page-table tree. periodt.

💖 RETURN 💖

the number of entries used. one number. that's the return value. count her and move on. ⭐

🌈 SEE ALSO 🌈

the whole squad, and i mean the whole squad — kernel file ./drivers/gpu/drm/xe/xe_pt.c plus:

fifteen references, all accounted for, nobody left on read. 🍓

🎀 the cute sign-off 🎀

she lives in ./drivers/gpu/drm/xe, she's dated October 2026, and she answers to xe_pt_stage_unbind(9) — that's the page, that's the whole page, every flag and fact intact, mwah. go commit that unbind in the right critical section and slay 💜✨

📦 where this page comes from