STRUCT AMD_HFI_CPUINFO(9)

✨ struct amd_hfi_cpuinfo — HFI workload class info per CPU ✨

okay bestie, so this is a page from the Kernel API Manual (yes, the struct amd_hfi_cpuinfo(9) one) and it's literally just the lil' info card that a CPU keeps about its own workload class vibes 🦋 buckle up, it's short but it's iconic.

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🌸 NAME 🌸

struct amd_hfi_cpuinfo — HFI workload class info per CPU. that's it, that's the whole assignment 💅

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🎀 SYNOPSIS 🎀

struct amd_hfi_cpuinfo {
    int cpu;
    u32 apic_id;
    s16 class_index;
    u8 nr_class;
    int *ipcc_scores;
    struct amd_hfi_classes  *amd_hfi_classes;
 };

no cap, that's the whole struct. every field, exactly as written, don't touch a single character 🔥

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💖 Members 💖

girl, let's go field by field, i got you:

• cpu — the CPU index. like, which CPU this is 🧚
• apic_id — the APIC id of the current CPU. its little ID badge fr fr 🌈
• class_index — the workload class ID index, aka which class slipped in 🎀
• nr_class — the max number of workload class supported. yes, "supported", that's what it says, i'm not fixing the grammar, periodt ✨
• ipcc_scores — ipcc scores for each class, one per class, stored in a pointer obviously 💜
• amd_hfi_classes — current CPU workload class ranking data. this is the main character field ngl 👑

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🦋 Description 🦋

so like, this struct is the parameters of a logical processor linked with hardware feedback class. that's literally the whole description bestie — the CPU's ~personal~ HFI info, all bundled up 🫶

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⭐ SEE ALSO ⭐

go look at these, iykyk:

• Kernel file ./drivers/platform/x86/amd/hfi/hfi.c struct
• amd_shmem_info(9)
• struct amd_hfi_classes(9)
• amd_hfi_online(9)
• amd_hfi_offline(9)

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💀 real talk: this manpage is like, four lines of lore. but every single line is here, so we ate and left no crumbs 🍓

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and that's a wrap! cute lil sign-off: this one lives under ./drivers/platform/x86/amd/hfi and it's dated October 2026 — see you in the future, bestie 😭🌸💖