radeon_gtt_location(9)

📦 version 7.3.1, in nixpkgs unstable

💅 radeon_gtt_location(9) — from the Kernel API Manual, bestie

okay so real talk, this is a page straight out of the Kernel API Manual and it's literally called radeon_gtt_location(9). it's a tiny little function page but it's doing important work, so let's get into it 🫶

✨ NAME ✨

radeon_gtt_location — the "hey, let's try to find where GTT lives" function 💖

✨ SYNOPSIS ✨

void radeon_gtt_location (struct radeon_device *rdev , struct radeon_mc
*mc );

like, it returns void — nothing back, no drama, she just does the thing 🎀

✨ ARGUMENTS ✨

  • rdev — the radeon device structure, and yes she's holding all necessary informations. every last one. she's got the whole group chat in there 💅
  • mc — the memory controller structure, holding the memory informations. this is the one that knows where all the memory vibes are at 🌸

✨ DESCRIPTION ✨

so what she actually does: this function will try to place GTT before or after VRAM. that's the whole mission. she's out here doing placement like it's seating charts at a wedding 💀

and here's the cute part — if GTT size is bigger than the space left, we ajust GTT size. (yes "ajust", that's the original spelling, don't come for me 🙈). so she just shrinks herself to fit. adaptive queen behavior honestly 👑

Thus function will never fails. she does not fail. she literally cannot. no cap, that's the guarantee. ✨

FIXME: when reducing GTT size align new size on power of 2. — so there's a known little todo note here: when you're reducing the GTT size, the new size should get aligned on a power of 2. flagged as a FIXME, so it's a real thing someone still needs to deal with, not me making stuff up 🍓

✨ SEE ALSO ✨

the source lives in the kernel file ./drivers/gpu/drm/radeon/radeon_device.c — go read her in her natural habitat 🦋

and here is the whole entire friend group, no one left out, ordering preserved for the girlies who care (i care):

and that's the page!! source path <purple>./drivers/gpu/drm/radeon</purple>, dated October 2026, tied to radeon_gtt_location(9) — mwah, go off bestie, we love a function that never fails 💜✨🎀

📦 where this page comes from