ccw_device_pnso(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ccw_device_pnso — the Kernel API Manual glow-up

okay bestie, buckle up, because today we're learning ccw_device_pnso — which is literally "Perform Network-Subchannel Operation" and yes it's giving main character energy in the ./drivers/s390/cio cinematic universe 🎀

✨ SYNOPSIS ✨

int ccw_device_pnso (struct ccw_device *cdev , struct chsc_pnso_area
*pnso_area , u8 oc , struct chsc_pnso_resume_token resume_token , int
cnc );

that's the whole vibe. five params, one int coming back at you, no cap 💖

🌸 ARGUMENTS 🌸

  • cdev — the device we're doing PNSO on. it's the device. the one. 👑
  • pnso_area — the request and response block for the operation, so it's doing double duty (iconic, honestly) 🦋
  • oc — the Operation Code. it's a u8, so keep it smol. ✨
  • resume_token — a struct chsc_pnso_resume_token, and it's your resume token for a multiblock response. iykyk 🎀
  • cnc — Boolean change-notification control. int, but it's a yes/no vibe check. 💅

🧚 DESCRIPTION 🧚

okay so here's the thing, and this part is not optional, bestie:

pnso_area must be allocated by the caller with

get_zeroed_page(GFP_KERNEL)

like, you allocate it. not us. not the kernel being cute for you. you. 🙈

and then it Returns 0 on success. that's the good ending. ⭐

🔥 SEE ALSO 🔥

your group chat, but make it kernel functions — the whole squad, no one left out:

like i said. everyone. 🫶

and that's the page!! this little beauty lives in ./drivers/s390/cio, it's dated October 2026, and it's filed under the Kernel API Manual — which is honestly the most prestigious folder to be in, periodt. go forth and PNSO responsibly 💜✨

📦 where this page comes from