STRUCT HBM_CLIENT_DMA_UNMAP_REQUEST(9)

💖 struct hbm_client_dma_unmap_request — Kernel API Manual 💖

okay so bestie, welcome to the struct hbm_client_dma_unmap_request(9) page — yes that's the whole long name, she's giving full government name energy 👑. This is the Kernel API Manual, and this little struct is literally the client dma unmap request from the host to the firmware. No cap.

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✨ NAME ✨

struct hbm_client_dma_unmap_request — the client dma unmap request that goes from the host to the firmware 🫶

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🦋 SYNOPSIS 🦋

struct hbm_client_dma_unmap_request {
    u8 hbm_cmd;
    u8 status;
    u8 client_buffer_id;
    u8 reserved;
 };

like... four whole u8s. she's compact. she's efficient. she ate 💅

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🎀 Members 🎀

okay let's meet the squad, one member at a time:

• hbm_cmd — the bus message command header 🌸 that's her little name tag so everyone knows what kind of message she is
• status — the unmap status 💫 basically the vibe check result
• client_buffer_id — the client buffer id 🎯 the id of the client buffer, iconic, no notes
• reserved — reserved 🙈 she's just sitting there, reserved, not doing anything, main character energy of a placeholder

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🔥 SEE ALSO 🔥

bestie there are SO many friends on this list, iykyk — here's the whole group chat, no skipping, fr fr:

Kernel file ./drivers/misc/mei/hw.h: 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_response(9)

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ngl bestie, that's a whole ecosystem of hbm structs and enums and mei_ext_* functions and every single one of them is linked above — go read them all, they're literally all right there in ./drivers/misc/mei/hw.h 💜

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and that's the page!! 🧚 from the ./drivers/misc/mei crew, dated October 2026 — mwah, periodt 💖✨🍓