STRUCT SOF_IPC4_MSG(9)

💅 struct sof_ipc4_msg(9) 💅

okay bestie, welcome to the struct sof_ipc4_msg(9) page from the Kernel API Manual — we folded the manual name in up here instead of doing a boring header line, and honestly? it's giving accessible ✨

🎀 NAME 🎀

struct sof_ipc4_msg — Placeholder of an IPC4 message. That's the whole name section, short and iconic 💖

✨ SYNOPSIS ✨

Here's the struct in all its glory, copied exactly, no edits, no cap:

       struct sof_ipc4_msg {
           union {
             u64 header_u64;
             struct {
               u32 primary;
               u32 extension;
             };
           };
           size_t data_size;
           void *data_ptr;
        };

🌸 Members 🌸

• {unnamed_union} — anonymous, literally no name, mysterious main character energy 🫣
  • header_u64 — the IPC4 header as a single u64 number 🔥
  • {unnamed_struct} — anonymous again, the struct version of "no thoughts, just vibes" 🙈
    • primary — the primary part of the header, and it's mandatory — not optional, the required one 👑
    • extension — the extended part of the header; if it's not used, it should be set to 0 ⭐
• data_size — the size of the data, in bytes, that data_ptr points to 📏
• data_ptr — pointer to the optional payload of a message, so it's the "maybe there, maybe not" data hookup 🎀

👀 SEE ALSO 👀

Kernel file ./include/sound/sof/ipc4/header.h, plus these besties: struct sof_ipc4_tuple(9), struct sof_ipc4_process_data_error_event_data(9), struct sof_ipc4_mixer_underrun_event_data(9), union sof_ipc4_resource_event_data(9), and struct sof_ipc4_notify_module_data(9) 🦋

source/version check bestie: ./include/sound/sof/ipc4 — date: October 2026 — page: struct sof_ipc4_msg(9). That's the cute sign-off, mwah 💋💅