ccw_device_tm_start_key(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ccw_device_tm_start_key — a Kernel API Manual moment

okay so bestie, welcome to the ccw_device_tm_start_key(9) page, straight out of the Kernel API Manual ✨ this one's short and sweet but she's important, so let's get into it 🫶

✨ NAME ✨

ccw_device_tm_start_key — perform start function 🌸

🎀 SYNOPSIS 🎀

int ccw_device_tm_start_key (struct ccw_device *cdev , struct tcw *tcw ,
unsigned long intparm , u8 lpm , u8 key );

like, that's the whole signature, no cap 💖

🦋 ARGUMENTS 🦋

  • cdev — the ccw device you're gonna perform the start function on, she's the main character here 👑
  • tcw — the transport-command word that's getting started ✨
  • intparm — a user defined parameter that gets passed to the interrupt handler, so like, your little note-to-self 📝
  • lpm — mask of paths to use 🛤️
  • key — storage key to use for storage access 🔑

💜 DESCRIPTION 💜

Start the tcw on the given ccw device. Return zero on success, non-zero otherwise. literally that simple, periodt 💅

ngl bestie, "non-zero otherwise" is doing a lot of heavy lifting there — just vibe check the return value and you'll know 😭

🌈 SEE ALSO 🌈

the whole friend group, fr fr 💖 the Kernel file ./drivers/s390/cio/device_ops.c and then:

and that's the page!! 🧚 she lives in ./drivers/s390/cio, dated October 2026, and this was ccw_device_tm_start_key(9) — slay, go start some transport-command words, ily bye 💜🎀

📦 where this page comes from