ttm_bo_validate(9)

🦋 ttm_bo_validate(9) — straight from the Kernel API Manual 🦋

okay so bestie, this is the ttm_bo_validate(9) page from the Kernel API Manual, and it is short, iconic, and very buffer-object coded. Let’s get into it 💅

✨ NAME ✨

ttm_bo_validate — that’s literally it. The original NAME line is just ttm_bo_validate - with nothing after the dash, so we are not inventing a cute little description. Periodt. 🎀

✨ SYNOPSIS ✨

Here’s the signature, character-for-character:

int ttm_bo_validate (struct ttm_buffer_object *bo , struct ttm_placement *placement , struct ttm_operation_ctx *ctx );

✨ ARGUMENTS ✨

• bo — the buffer object. main character energy, honestly.
• placement — proposed placement for the buffer object. Like, where it might go 👀
• ctx — validation parameters.

✨ DESCRIPTION ✨

So what does it do? It changes the placement and caching policy of the buffer object to match the proposed placement. Slay.

And here are the returns, bestie — all of them, no skipping:

• -EINVAL — on invalid proposed placement. not it.
• -ENOMEM — on out-of-memory condition. the classic.
• -EBUSY — if no_wait is true and buffer busy. busy buffer said no.
• -ERESTARTSYS — if interrupted by a signal. rude, but okay.

✨ SEE ALSO ✨

Kernel file ./drivers/gpu/drm/ttm/ttm_bo.c is the spot. Then the whole squad:

• ttm_bo_move_to_lru_tail(9)
• ttm_bo_set_bulk_move(9)
• ttm_bo_eviction_valuable(9)
• ttm_bo_evict_first(9)
• ttm_bo_alloc_at_place(9)
• struct ttm_bo_evict_walk(9)
• ttm_bo_evict_cgroup(9)
• ttm_bo_pin(9)
• ttm_bo_unpin(9)
• ttm_bo_alloc_resource(9)
• ttm_bo_init_reserved(9)
• ttm_bo_init_validate(9)
• ttm_bo_unmap_virtual(9)
• ttm_bo_wait_ctx(9)
• struct ttm_bo_swapout_walk(9)
• ttm_bo_swapout(9)
• ttm_bo_populate(9)

okay that’s the whole page, bestie 🫶 Cute sign-off time: source/version is ./drivers/gpu/drm/ttm, the date is October 2026, and the footer title is ttm_bo_validate(9). iconic, no cap 💖✨