wmidev_query_block(9)

📦 version 7.3.1, in nixpkgs unstable

💅 wmidev_query_block (9) — like, the WMI data block querier bestie

okay so this is a page from the Kernel API Manual and it's all about wmidev_query_block(9) — one single function, but she's very important, no cap. let's get into it 🎀

✨ NAME ✨

wmidev_query_block — return the contents of a WMI data block. that's it, that's the whole job, and she does it slayfully 💖

🌸 SYNOPSIS 🌸

int wmidev_query_block (struct wmi_device *wdev , u8 instance , struct
wmi_buffer *out , size_t min_size );

literally just copy that exactly, bestie, don't retype it from memory 😭

🦋 ARGUMENTS 🦋

  • wdev — a wmi bus device that comes from a driver. yeah, it's the device you're working with 🫶
  • instance — the instance index. which one? this one. 🔢
  • out — the WMI buffer you're gonna fill up. it's the output hole, basically 💀
  • min_size — the minimum size of the result data, measured in bytes. minimum, bestie, don't skimp ✨

👑 DESCRIPTION 👑

so you query a WMI data block. that's the vibe. that's the whole vibe.

⚠️ important thing, do NOT skip this: the caller (that's you, hi 💅) must free the resulting data inside out using kfree. like, that's your responsibility, not the kernel's. no one's gonna clean up after you, this isn't your bedroom 🧹

and good news: said data is guaranteed to be aligned on an 8-byte boundary. aligned! iconic! the memory layout is behaving 🌈

⭐ RETURN ⭐

  • 0 on success 🎉
  • a negative error code on failure 😭

that's the whole return contract, two outcomes, choose your fighter.

🔥 SEE ALSO 🔥

the kernel file lives at ./drivers/platform/wmi/core.c — go read her, she's the source of truth 📖

and here's the whole friend group, all sixteen of them, no one left out:

like, the whole squad fr fr 🫶

and that's the page!! brought to you by the fine people over at ./drivers/platform/wmi, stamped October 2026, and yes she's wmidev_query_block(9) all the way down 💜 mwah, go free your buffers 🎀

📦 where this page comes from