STRUCT REGISTERED_EVENT_DATA(9)

💖 struct registered_event_data 💖

okay bestie, this is the struct registered_event_data page from the Kernel API Manual, and we're gonna get you so comfy with it. it's genuinely not scary, i promise 🫶

---

✨ NAME ✨

struct registered_event_data — literally just "Registered Event Data." that's the whole name, and honestly? iconic of it to be that direct 💅

---

🌸 SYNOPSIS 🌸

here's the whole struct, exactly as it lives, no cap:

struct registered_event_data {
    u64 key;
    enum pm_api_cb_id cb_type;
    bool wake;
    struct list_head cb_list_head;
    struct hlist_node hentry;
 };

look at her. five fields. perfectly balanced. main character energy 👑

---

🦋 Members 🦋

okay so let's meet the squad, one field at a time 💜

• key — so this is the combine id (Node-Id | Event-Id), and its type is u64. the upper u32 is the Node-Id and the lower u32 is the Event-Id — that's the split, don't mix 'em up 🙈. and this little thing gets used as the key to index into the hashmap. she's the lookup girly ✨
• cb_type — the type of Api callback, like PM_NOTIFY_CB, etc. so basically "which flavour of callback are we dealing with" 🎀
• wake — if this flag is set, the firmware will wake up the processor if it's in sleep or power down state. she's the alarm clock ⏰🔥 set it and the processor will be summoned, fr fr.
• cb_list_head — head of the call back data list, which contains the information about the registered handler and private data. think of it as the clipboard holding everyone's details 📋💖
• hentry — the hlist_node that hooks this entry into the hashtable. she's the little hook that keeps everything chained together 🪝 lowkey essential.

---

🌈 SEE ALSO 🌈

go look at the kernel file ./drivers/soc/xilinx/xlnx_event_manager.c, plus these besties:

• struct agent_cb(9)
• xlnx_register_event(9)
• xlnx_unregister_event(9)

---

💀 real talk: key packing is Node-Id in the upper u32 and Event-Id in the lower u32 — that's just how it is on this page, bestie. don't be out here inventing your own layout, i'm begging 🙏

---

and that's the whole vibe check, you ate that 🍓✨ this page lives in ./drivers/soc/xilinx, dated October 2026 — mwah, go forth and slay your hashmaps 👑💅🧚