STRUCT HBM_CLIENT_DMA_RESPONSE(9)

💅 NAME 💅

okay so welcome to the Kernel API Manual, section 9, and today's main character is struct hbm_client_dma_response — literally the client dma unmap response that comes from the firmware to the host. yes bestie, the firmware is sending you mail and this is the envelope 🫶

✨ SYNOPSIS ✨

struct hbm_client_dma_response {
    u8 hbm_cmd;
    u8 status;
 };

that's it. two u8s. tiny struct, huge main character energy 👑

🎀 Members 🎀

• hbm_cmd — the bus message command header, aka the little label that says what kind of message this even is 🏷️
• status — the command status, aka how did it go, did it slay or did it flop 💀

🦋 SEE ALSO 🦋

bestie there is a whole friend group here, and they all live in the kernel file ./drivers/misc/mei/hw.h — go say hi to all of them fr fr:

• enum mei_hbm_status(9)
• enum mei_ext_hdr_type(9)
• struct mei_ext_hdr(9)
• struct mei_ext_meta_hdr(9)
• struct mei_ext_hdr_vtag(9)
• mei_ext_begin(9)
• mei_ext_last(9)
• struct mei_ext_hdr_gsc_h2f(9)
• struct mei_ext_hdr_gsc_f2h(9)
• mei_ext_next(9)
• mei_ext_hdr_len(9)
• struct mei_msg_hdr(9)
• struct mei_hbm_cl_cmd(9)
• enum hbm_host_enum_flags(9)
• struct hbm_host_enum_request(9)
• struct mei_client_properties(9)
• struct hbm_add_client_request(9)
• struct hbm_add_client_response(9)
• struct hbm_power_gate(9)
• struct hbm_client_connect_request(9)
• struct hbm_client_connect_response(9)
• struct hbm_notification_request(9)
• struct hbm_notification_response(9)
• struct hbm_notification(9)
• struct hbm_dma_mem_dscr(9)
• struct hbm_dma_setup_request(9)
• struct hbm_dma_setup_response(9)
• struct hbm_dma_ring_ctrl(9)
• struct hbm_capability_request(9)
• struct hbm_capability_response(9)
• struct hbm_client_dma_map_request(9)
• struct hbm_client_dma_unmap_request(9)

like I said, it's giving very "everyone's invited to the group chat" 🌈

ngl the whole squad above lives under ./drivers/misc/mei — that's the neighborhood, hw.h is the house 🏡

and that's the whole page, bestie — no cap, you now know everything there is to know about struct hbm_client_dma_response 💜 this lil cutie came out of the ./drivers/misc/mei directory, October 2026 edition, filed under struct hbm_c...dma_response(9) — periodt. 🎀✨