STRUCT MEI_EXT_HDR_GSC_H2F(9)

💖 NAME 💖

okay so bestie, we're in the Kernel API Manual and this page is struct mei_ext_hdr_gsc_h2f(9) 💅

struct mei_ext_hdr_gsc_h2f — extended header: gsc host to firmware interface. that's the whole name, no cap, and it's lowkey iconic ✨

✨ SYNOPSIS ✨

this is the whole struct flex, fr fr:

struct mei_ext_hdr_gsc_h2f {
    struct mei_ext_hdr hdr;
    u8 client_id;
    u8 addr_type;
    u32 fence_id;
    u8 input_address_count;
    u8 output_address_count;
    u8 reserved[2];
    struct mei_gsc_sgl sgl[];
};

🫶 Members 🫶

the members are the main characters here, so let's give them their moment 💖

• hdr — extended header. it's giving header energy ✨
• client_id — GSC_HECI_MSG_KERNEL or GSC_HECI_MSG_USER. pick your fighter 🫶
• addr_type — GSC_ADDRESS_TYPE_{GTT, PPGTT, PHYSICAL_CONTINUOUS, PHYSICAL_SGL}. yes, all of those exactly, no edits 💅
• fence_id — synchronization marker. the way it literally synchronizes 😭
• input_address_count — number of input sgl buffers. count them, bestie 🔥
• output_address_count — number of output sgl buffers. also count them 🌸
• reserved — reserved. not me checking it twice, it's reserved 🫥
• sgl — sg list. and yes, sgl[] keeps its brackets exactly, periodt 🎀

🌈 SEE ALSO 🌈

the whole extended-header / HBM friend group pulled up, no cap:

• 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_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)
• struct hbm_client_dma_response(9)

mwah 💋 — source/version: ./drivers/misc/mei; date: October 2026; page: struct mei_ext_hdr_gsc_h2f(9). periodt 🫶