STRUCT CCWGROUP_DEVICE(9)

✨ struct ccwgroup_device — bestie edition ✨

okay so this is the struct ccwgroup_device(9) page from the Kernel API Manual, and it's literally the blueprint for a ccw group device 🎀 s390 hive rise up, this one's for you 🦋

---

🌸 NAME 🌸

struct ccwgroup_device — ccw group device. that's it, that's the vibe 💅

---

✨ SYNOPSIS ✨

bestie, here's the whole struct, copied exactly, no cap 🫶

struct ccwgroup_device {
    enum {
      CCWGROUP_OFFLINE,
      CCWGROUP_ONLINE,
    } state;
    unsigned int count;
    struct device   dev;
    struct work_struct ungroup_work;
    struct ccw_device *cdev[];
 };

---

💖 Members 💖

okay so every single field, one by one, let's go 👑

• state — the online/offline state. is it up or is it down? that's the question and state is the answer ✨ (and yeah, the options are CCWGROUP_OFFLINE and CCWGROUP_ONLINE, living right there in that anonymous enum 🎀)
• count — number of attached slave devices. an unsigned int, keeping track of how many slaves are in the group 💀
• dev — the embedded struct device. the main character energy of the whole struct, it's giving infrastructure 👑
• ungroup_work — a struct work_struct used to ungroup the ccwgroup device. lowkey the breakup mechanic of this struct 😭
• cdev — variable number of slave devices, allocated as needed. a struct ccw_device * flexible array, so it grows exactly as much as it needs to, obsessed 🌱

---

🔥 SEE ALSO 🔥

• Kernel file ./arch/s390/include/asm/ccwgroup.h
• struct ccwgroup_driver(9)

go read those too, iykyk 📚

---

that's the whole thing bestie, every field accounted for, nothing skipped, fr fr 💜 now go forth and slay your s390 driver work 🌈⭐

this gem lives under ./arch/s390/include/asm in the Kernel API Manual, dated October 2026 — screenshot it, bookmark it, tattoo it, whatever, and see you in the next manpage 🧚💖