STRUCT AMD_HFI_CLASSES(9)

🌸 struct amd_hfi_classes(9) 🌸

okay so bestie, we're in the Kernel API Manual today and the star of the show is struct amd_hfi_classes. she's giving tiny-but-mighty, fr fr 💅

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✨ NAME ✨

struct amd_hfi_classes — the HFI class capabilities, per CPU, no cap 🧢

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🦋 SYNOPSIS 🦋

struct amd_hfi_classes {
    u32 perf;
    u32 eff;
 };

like, that's the whole struct. two little u32s. she's lowkey minimalist and honestly? obsessed 🎀

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💖 MEMBERS 💖

• perf — the performance capability, aka her main character stat ✨
• eff — the power efficiency capability, aka her chill-and-save-energy era 🌿

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🌈 DESCRIPTION 🌈

so what is this? it's the capabilities of a logical processor in the ranking table. yes, ranking table — everyone's getting ranked, it's giving talent show 🏆

these capabilities are unitless (no units, no drama, just vibes) and they're specific to each HFI class — so like, don't go comparing across classes, that's not the assignment 🙈

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👑 SEE ALSO 👑

• the kernel file ./drivers/platform/x86/amd/hfi/hfi.c
• struct amd_shmem_info(9) 🫶
• struct amd_hfi_cpuinfo(9) 💜
• amd_hfi_online(9) 🔥
• amd_hfi_offline(9) 💀

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ngl bestie, read the SEE ALSO list before you go poking around — the homies in hfi.c know things 💅

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okay that's the page!! this absolute icon lives over in ./drivers/platform/x86/amd/hfi, dated October 2026, and it is, as always, struct amd_hfi_classes(9). mwah, go slay your kernel work bestie 😭💖