_ctl_diag_query(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME

_ctl_diag_query — bestie, this is the one that queries all the relevant info tied to your diag buffers ✨

So this is a Kernel API Manual page, and it's the little query helper in the mpt3sas world — no cap, it's the "hey what's going on with this diagnostic buffer" call 🎀

✨ SYNOPSIS

long _ctl_diag_query (struct MPT3SAS_ADAPTER *ioc , void __user *arg );

Yeah that's it, that's the whole vibe — two args, one long coming back at you 🫶

🦋 ARGUMENTS

  • ioc — the per adapter object. Your adapter. Your main character 🎀
  • arg — a user space buffer containing the ioctl content, i.e. the little payload the app is handing down 🙈

💖 DESCRIPTION

okay so here's the tea 🍓

The application will send only buffer_type and unique_id. That's it, no extra luggage, pack light bestie.

The driver then inspects unique_id first — first thing it does, priority queen 👑 — and if that unique_id is valid, it fills in all the info. Slay.

And if unique_id is 0x00? Then the driver returns the info specified by Buffer Type instead. Lowkey a whole different path, but iconic either way 💅✨

👑 SEE ALSO

Literally the entire friend group, fr fr — also the kernel file ./drivers/scsi/mpt3sas/mpt3sas_ctl.c 🧚

okay that's the whole page bestie, go touch some diag buffers 💜

Sign-off time 🫶 this one lives in ./drivers/scsi/mpt3sas and the version/date stamp on it is October 2026 — periodt, that's a wrap 🌸

📦 where this page comes from