dmub_srv_calc_region_info(9)

📦 version 7.3.1, in nixpkgs unstable

✨ dmub_srv_calc_region_info(9) ✨

okay so this is a page from the Kernel API Manual (yes the real one, section 9, we're literally in kernel-land bestie) and it's all about dmub_srv_calc_region_info — the little function that goes "hey, where does everything live?" 🗺️💖

🌸 NAME 🌸

dmub_srv_calc_region_info — retreives region info from the dmub service 💅 (and yes, that spelling is copy-pasted straight from the source, do not come for me, the kernel said what it said) 🙈

🦋 SYNOPSIS 🦋

enum dmub_status dmub_srv_calc_region_info (struct dmub_srv *dmub ,
const struct dmub_srv_region_params *params , struct
dmub_srv_region_info *out );

like, it takes three things and gives you back a enum dmub_status, that's the whole vibe ✨

🎀 ARGUMENTS 🎀

  • dmub — the dmub service itself, the main character 👑
  • params — the parameters used to calculate region locations 📐
  • out — -- undescribed -- 😭 like the manpage literally did not describe it, so I'm not gonna invent lore for it, that would be lying and we don't do that here 🫶

💜 DESCRIPTION 💜

Calculates the base and top address for all the relevant dmub regions, using the parameters you gave it (if any — if any!! it says "if any", so that's a thing that can happen) 🧚✨

that's it, that's the whole function. it does math on addresses so you don't have to 💅

🔥 RETURN 🔥

  • DMUB_STATUS_OK — success, slay, it worked 🎉
  • DMUB_STATUS_INVALID — unspecified error, it's giving mystery, it's giving "we're not telling" 💀

🌈 SEE ALSO 🌈

first up, the kernel file itself:

./drivers/gpu/drm/amd/display/dmub/dmub_srv.h

then the whole friend group, in exactly this order, no cap:

like that's the entire extended universe, go read them all, iykyk 📚✨

🫶 friendly reminder bestie: this page is straight out of ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — so yeah, future vibes, and it's the dmub_srv_calc_region_info(9) page, periodt. 💅🎀
📦 where this page comes from