vio_cmo_bus_probe(9)

📦 version 7.3.1, in nixpkgs unstable

💅 vio_cmo_bus_probe(9) 💅

okay bestie so this is a page straight out of the Kernel API Manual, and it's all about vio_cmo_bus_probe — the little function that handles all the CMO-specific bus probe activities. yes she's niche. yes she's iconic. let's get into it 🫶

✨ NAME ✨

vio_cmo_bus_probe — handles the CMO specific bus probe activities, no cap 🌸

🦋 SYNOPSIS 🦋

int vio_cmo_bus_probe (struct vio_dev *viodev );

that's it. that's the whole vibe. one function, one argument, main character energy only 💅

🎀 ARGUMENTS 🎀

  • viodev — okay so the manpage literally just says -- undescribed -- for this one 😭 but don't panic, the description below has the tea: it's a pointer to struct vio_dev for the device.

👑 DESCRIPTION 👑

So viodev is a pointer to struct vio_dev for the device. Cool cool cool.

What this function actually does: it determines the device's IO memory entitlement needs, and here's the strategy — it tries to satisfy the system minimum entitlement first, then it schedules a balance operation to take care of the rest at a later time. literally "handle the urgent stuff now, circle back for the rest" and honestly that's such a mood ⭐

🔥 RETURN 🔥

  • 0 — success, slay, we ate 💖
  • -EINVAL — returned when the device doesn't support CMO, so sorry bestie 🙈
  • -ENOMEM — returned when entitlement is not available for the device or for the device entry 💀

🌈 SEE ALSO 🌈

Kernel file ./arch/powerpc/platforms/pseries/vio.c, and the whole friend group:

and that's the whole page, bestie!! 💜 biggest kiss to the ./arch/powerpc/platforms/pseries girlies, this one's dated October 2026, and it's still serving vio_cmo_bus_probe(9) realness ✨🎀🦋

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