mei_me_hbuf_write(9)

✨ mei_me_hbuf_write — the manual page bestie 💅

okay so picture this: it's a Kernel API Manual entry, the function is mei_me_hbuf_write, and it's literally the girl that drops your message into the host hw buffer. that's it. that's the whole job. and she does it well. 🎀

---

🌸 NAME 🌸

mei_me_hbuf_write — writes a message to host hw buffer. no cap, that's the entire personality. ✨

---

🦋 SYNOPSIS 🦋

int mei_me_hbuf_write (struct mei_device *dev , const void *hdr , size_t
hdr_len , const void *data , size_t data_len );

like... look at her. five params. she's booked and busy. 👑

---

💖 ARGUMENTS 💖

• dev — the device structure. the main character, honestly. everything happens through her.
• hdr — header of message. the little intro before the actual content, iykyk.
• hdr_len — header length in bytes: must be multiplication of a slot (4bytes). this is not a suggestion bestie, it literally has to be a multiple of a slot, and a slot is 4bytes. do the math or she'll be mad. 😭
• data — payload. the actual message. the substance. we love her.
• data_len — payload length in bytes. yes, in bytes. keep up. ✨

---

🔥 RETURN 🔥

0 if success, < 0 — otherwise. that's it. zero is the slay outcome, anything negative is giving "something went wrong" energy. 💀

---

⭐ SEE ALSO ⭐

okay so this is the part where I list literally every friend she has, and there are a lot, because she's popular. 🫶

Kernel file ./drivers/misc/mei/hw-me.c:

mei_me_reg_read(9), mei_me_reg_write(9), mei_me_mecbrw_read(9), mei_me_hcbww_write(9), mei_me_mecsr_read(9), mei_hcsr_read(9), mei_hcsr_write(9), mei_hcsr_set(9), mei_hcsr_set_hig(9), mei_me_d0i3c_read(9), mei_me_d0i3c_write(9), mei_me_trc_status(9), mei_me_fw_status(9), mei_me_hw_config(9), mei_me_pg_state(9), me_intr_disable(9), me_intr_clear(9), mei_me_intr_clear(9), mei_me_intr_enable(9), mei_me_intr_disable(9), mei_me_synchronize_irq(9), mei_me_hw_reset_release(9), mei_me_host_set_ready(9), mei_me_host_is_ready(9), mei_me_hw_is_ready(9), mei_me_hw_is_resetting(9), mei_gsc_pxp_check(9), mei_me_hw_ready_wait(9), mei_me_hw_start(9), mei_hbuf_filled_slots(9), mei_me_hbuf_is_empty(9), mei_me_hbuf_empty_slots(9), mei_me_hbuf_depth(9), mei_me_count_full_read_slots(9), mei_me_read_slots(9), mei_me_pg_set(9), mei_me_pg_unset(9), mei_me_pg_legacy_enter_sync(9), mei_me_pg_legacy_exit_sync(9), mei_me_pg_in_transition(9), mei_me_pg_is_enabled(9), mei_me_d0i3_set(9), mei_me_d0i3_unset(9), mei_me_d0i3_enter_sync(9), mei_me_d0i3_enter(9), mei_me_d0i3_exit_sync(9), mei_me_pg_legacy_intr(9), mei_me_d0i3_intr(9), mei_me_pg_intr(9), mei_me_pg_enter_sync(9), mei_me_pg_exit_sync(9), mei_me_hw_reset(9), mei_me_irq_quick_handler(9), mei_me_irq_thread_handler(9), mei_me_polling_thread(9), mei_me_fw_type_nm(9), mei_me_fw_type_sps_4(9), mei_me_fw_type_sps_ign(9), mei_me_dev_init(9)

---

lowkey that's a long list but she said "invite everyone, I don't gatekeep." 🌈

---

and that's the whole page bestie, you ate that. this one's straight from ./drivers/misc/mei, dated October 2026 — so like, future iconic. go write to that host hw buffer. periodt. 💜🦋✨