STRUCT MSI_DEVICE_DATA(9)

📦 version 7.3.1, in nixpkgs unstable

💖 struct msi_device_data(9) 💖

okay so bestie, welcome to the Kernel API Manual — this is the page for struct msi_device_data, which is literally the per-device MSI data situation ✨

🎀 NAME 🎀

struct msi_device_data — MSI per device data, no cap 🫶

🌸 SYNOPSIS 🌸

struct msi_device_data {
    unsigned long                   properties;
    struct mutex                    mutex;
    struct msi_dev_domain
__domains[MSI_MAX_DEVICE_IRQDOMAINS];
    unsigned long                   __iter_idx;
 };

✨ Members ✨

okay the glow-up here is the member list, and every single one of them eats 💅

  • properties — the MSI properties that are actually interesting to drivers 👀 like this is the stuff drivers care about, fr fr
  • mutex — a mutex that protects the MSI descriptor store 🔒 she's the bodyguard, do not touch the descriptors without her
  • __domains — internal data for per device MSI domains 🧚 the private lil sanctuary, not for you
  • __iter_idx — the index used to search for the next entry for iterators 🔎 she keeps track of where you are in the walk
ngl the double-underscore girlies (__domains, __iter_idx) are internal — that naming is the vibe check telling you to back off 🙈

🦋 SEE ALSO 🦋

the whole friend group, in the kernel file ./kernel/irq/msi.c 🫶:

and that's the whole page bestie, go be iconic with your MSI descriptors 💜

this lil manual page comes from ./kernel/irq, dated October 2026 — mwah, see u in the group chat 🎀💖

📦 where this page comes from