STRUCT CSS_DRIVER(9)

🌸 NAME 🌸

okay bestie, welcome to struct css_driver(9) from the Kernel API Manual — this is literally the device driver for subchannels, and she's serving main character energy 💅✨

✨ SYNOPSIS ✨

here's the whole struct, no cap:

struct css_driver {
    struct css_device_id *subchannel_type;
    struct device_driver drv;
    void (*irq)(struct subchannel *);
    int (*chp_event)(struct subchannel *, struct chp_link *, int);
    int (*sch_event)(struct subchannel *, int);
    int (*probe)(struct subchannel *);
    void (*remove)(struct subchannel *);
    void (*shutdown)(struct subchannel *);
    int (*settle)(void);
 };

🫶 Members 🫶

okay so every field is doing its own lil job, and honestly? iconic:

• subchannel_type — the subchannel type supported by this driver; it's the vibe this driver signs up for 💖
• drv — the embedded device driver structure, tucked inside like a bestie who's always there 🫶
• irq — called on interrupts; it's giving "wait, something happened" energy 😭
• chp_event — called for events affecting a channel path, periodt
• sch_event — called for events affecting the subchannel, no cap
• probe — the function called on probe; she shows up when it's probe time ✨
• remove — the function called on remove</em></p> Wait, let's fix that tag: the function called on remove; she exits stage left when it's time 💅
• shutdown — called at device shutdown; very "powering down gracefully, slay" 🔥
• settle — wait for asynchronous work to finish; patient queen behavior, fr fr 👑

👑 SEE ALSO 👑

• Kernel file ./drivers/s390/cio/css.h — go read it, iykyk 🦋

this page comes straight from source/version ./drivers/s390/cio, dated October 2026, and it's all about struct css_driver(9) — bye bestie! 💅✨🌈