STRUCT ACPM_RX_DATA(9)

💖 struct acpm_rx_data — RX queue data 💖

okay bestie, so this is a page from the Kernel API Manual, and it's all about struct acpm_rx_data. That's the little data blob that keeps track of the RX queue. Slay. Let's get into it 🫶

✨ SYNOPSIS ✨

struct acpm_rx_data {
    u32 *cmd;
    size_t cmdcnt;
    size_t rxcnt;
    bool completed;
 };

no cap, that's the whole vibe right there 💅

🎀 Members 🎀

• cmd — pointer to where the data shall be saved. literally just a pointer to the save spot, iykyk 📍
• cmdcnt — allocated capacity of the cmd buffer, measured in 32-bit words. that's the capacity, not the length, bestie — know the difference 🔥
• rxcnt — expected length of the response in 32-bit words. what you're expecting back, fr fr 👀
• completed — a flag indicating if the firmware response has been fully processed. true means done-done, periodt ✅

🌈 SEE ALSO 🌈

okay so if you're going down this rabbit hole, here's the whole friend group 👑

• Kernel file ./drivers/firmware/samsung/exynos-acpm.c
• struct acpm_shmem(9)
• struct acpm_chan_shmem(9)
• struct acpm_queue(9)
• struct acpm_chan(9)
• struct acpm_info(9)
• struct acpm_match_data(9)
• acpm_get_saved_rx(9)
• acpm_get_rx(9)
• acpm_dequeue_by_polling(9)
• acpm_wait_for_queue_slots(9)
• acpm_prepare_xfer(9)
• acpm_wait_for_message_response(9)
• acpm_do_xfer(9)
• acpm_set_xfer(9)
• acpm_chan_shmem_get_params(9)
• acpm_achan_alloc_cmds(9)
• acpm_free_mbox_chans(9)
• acpm_channels_init(9)
• acpm_handle_put(9)
• devm_acpm_release(9)
• acpm_get_by_node(9)
• devm_acpm_get_by_node(9)
• devm_acpm_get_by_phandle(9)

and that's the whole page, bestie 💜 go read the source at ./drivers/firmware/samsung, and this one's dated October 2026 — main character energy fr 🦋✨