mei_hbm_cl_write(9)

💅 mei_hbm_cl_write(9) 💅

okay so bestie, welcome to mei_hbm_cl_write ✨ — that's the little legend from the Kernel API Manual that handles writing a simple hbm client message. yes, "hbm" = host bus message, and yes, she's iconic for it 🎀

---

🌸 SYNOPSIS 🌸

int mei_hbm_cl_write (struct mei_device *dev , struct mei_cl *cl , u8 hbm_cmd , void *buf , size_t len );

literally the whole signature, no cap 🫶

---

✨ ARGUMENTS ✨

• dev — the device structure. the main character of this operation, ngl 💖
• cl — the client. your bestie in question 🦋
• hbm_cmd — the host bus message command. this is the "what are we actually doing" vibe check ⭐
• buf — the message buffer. where the actual message lives 📦
• len — the buffer length. gotta know how much of that buffer is real, fr fr ✨

---

🌈 RETURN 🌈

0 on success, <0 on failure 😭 — like, she either ate or she didn't, no in-between 💀

---

💜 SEE ALSO 💜

okay so there are a lot of siblings in this family, and honestly? obsessed 👑

Kernel file ./drivers/misc/mei/hbm.c, plus: mei_cl_conn_status_to_errno(9), mei_hbm_write_message(9), mei_hbm_idle(9), mei_hbm_reset(9), mei_hbm_hdr(9), mei_hbm_cl_hdr(9), mei_hbm_cl_addr_equal(9), mei_hbm_cl_find_by_cmd(9), mei_hbm_start_wait(9), mei_hbm_start_req(9), mei_hbm_dma_setup_req(9), mei_hbm_capabilities_req(9), mei_hbm_enum_clients_req(9), mei_hbm_me_cl_add(9), mei_hbm_add_cl_resp(9), mei_hbm_fw_add_cl_req(9), mei_hbm_cl_notify_req(9), notify_res_to_fop(9), mei_hbm_cl_notify_start_res(9), mei_hbm_cl_notify_stop_res(9), mei_hbm_cl_notify(9), mei_hbm_cl_dma_map_req(9), mei_hbm_cl_dma_unmap_req(9), mei_hbm_prop_req(9), mei_hbm_pg(9), mei_hbm_stop_req(9), mei_hbm_cl_flow_control_req(9), mei_hbm_add_single_tx_flow_ctrl_creds(9), mei_hbm_cl_tx_flow_ctrl_creds_res(9), mei_hbm_cl_disconnect_req(9), mei_hbm_cl_disconnect_rsp(9), mei_hbm_cl_disconnect_res(9), mei_hbm_cl_connect_req(9), mei_hbm_cl_connect_res(9), mei_hbm_cl_res(9), mei_hbm_fw_disconnect_req(9), mei_hbm_pg_enter_res(9), mei_hbm_pg_resume(9), mei_hbm_pg_exit_res(9), mei_hbm_config_features(9), mei_hbm_version_is_supported(9), mei_hbm_dispatch(9) 🧚💅

---

go read them. all of them. iykyk 💖

---

and that's the page, bestie 🎀 this whole thing lives in ./drivers/misc/mei, dated October 2026 — so like, future vibes only 🔥 mwah 💋