STRUCT DFL_DEVICE(9)

💖 struct dfl_device(9) 💖

okay bestie, welcome to the Kernel API Manual entry for struct dfl_device — yes we're in section 9, yes it's a struct, and yes it's literally the whole personality of an dfl device on the dfl bus. slay.

✨ NAME ✨

struct dfl_device — the struct that represents a dfl device on the dfl bus 🦋

🌸 SYNOPSIS 🌸

struct dfl_device {
    struct device dev;
    int id;
    u16 type;
    u16 feature_id;
    u8 revision;
    struct resource mmio_res;
    int *irqs;
    unsigned int num_irqs;
    struct dfl_fpga_cdev *cdev;
    const struct dfl_device_id *id_entry;
    u8 dfh_version;
    unsigned int param_size;
    void *params;
 };

no cap, that's the whole glow-up. every field copied exactly, character for character, because we do not edit source code in this house 💅

🎀 Members 🎀

• dev — the generic device interface. like, the main character energy slot every device struct needs 🫶
• id — the id of the dfl device. it's an int, it's iconic, it's how you know who's who.
• type — type of DFL FIU of the device. check enum dfl_id_type for the vibes (iykyk).
• feature_id — feature identifier local to its DFL FIU type. so like, it only makes sense next to its own type — a little duo, honestly 💜
• revision — revision of this dfl device feature. a u8, very demure, very mindful.
• mmio_res — mmio resource of this dfl device. it's a struct resource, aka the memory-mapped moment.
• irqs — list of Linux IRQ numbers of this dfl device. a whole int * of interrupts, obsessed 😭
• num_irqs — number of IRQs supported by this dfl device. the count, the total, the unsigned int of it all.
• cdev — pointer to the DFL FPGA container device this dfl device belongs to. it's giving family tree 🌈
• id_entry — matched id entry in dfl driver's id table. the const struct dfl_device_id * that said "it's you" 💖
• dfh_version — version of DFH for the device. a u8 keeping track of which DFH era we're in.
• param_size — size of the block parameters in bytes. unsigned int, extremely precise, we love a unit.
• params — pointer to block of parameters copied memory. a void *, so it's mysterious and flexible, lowkey main character 🧚

fr fr bestie, don't invent extra fields — the struct in the synopsis is the whole entire struct, no bonus content 💀

🔥 SEE ALSO 🔥

• Kernel file ./include/linux/dfl.h
• enum dfl_id_type(9)
• struct dfl_driver(9)

and that's the tea 🍓 this page lives in ./include/linux, version October 2026 vibes, and it's filed as struct dfl_device(9) — periodt, go read the header file now, mwah 💜✨🎀