STRUCT HBM_CAPABILITY_REQUEST(9)

👑 struct hbm_capability_request(9) — a Kernel API Manual moment 💖

okay so bestie, welcome to the Kernel API Manual, page struct hbm_capability_request(9). yes the whole title is that long, she's extra, we love her for it ✨

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🌸 NAME 🌸

struct hbm_capability_request — it's literally a capability request going from host to fw, no cap 🫶

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🦋 SYNOPSIS 🦋

struct hbm_capability_request {
    u8 hbm_cmd;
    u8 capability_requested[3];
 };

that's the whole thing. she's small. she's iconic. she ate 💅

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🎀 Members 🎀

• hbm_cmd — the bus message command header. the header of the bus message, the opening act, the main character of the first byte 🌟
• capability_requested — a bitmask of the capabilities the host is requesting. like a little wishlist but in bits, one bit per vibe 🔥

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🌈 SEE ALSO 🌈

bestie there are SO many siblings, look at this family reunion 😭 the kernel file ./drivers/misc/mei/hw.h is the home base, and from there we've got:

• 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_response(9)
• struct hbm_client_dma_map_request(9)
• struct hbm_client_dma_unmap_request(9)
• struct hbm_client_dma_response(9)

ngl that's a whole group chat right there, go read them all, iykyk 💜

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and that's the page!! mwah 💋 this one came from ./drivers/misc/mei, dated October 2026, under the Kernel API Manual banner — that's a wrap, slay, periodt 🎀🦋✨