map_cdies(9)

💅 map_cdies(9)

okay so bestie, real talk: we're in the Kernel API Manual, section 9, and this little icon is called map_cdies — the way it just maps a user domain ID to a compute domain ID?? we love a glow-up with a clear purpose ✨

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🌸 NAME 🌸

map_cdies — Map user domain ID to compute domain ID 🗺️💖

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✨ SYNOPSIS ✨

int map_cdies (struct tpmi_sst_struct *sst_inst , u8 id , u8 *partition
);

yes the signature is literally right there, copy it exactly, do not freestyle it, i'm begging 🫶

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🎀 ARGUMENTS 🎀

• sst_inst — TPMI Instance 💅 like, this is the whole vibe you're operating on
• id — User domain ID 🔢 the one you're rolling up with
• partition — Resolved partition 🧚 this is where the answer lands, bestie

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🦋 DESCRIPTION 🦋

So here's the tea, no cap: this is a helper function for map_partition_power_domain_id — its whole job is to resolve the compute domain ID and the partition. 🫶

And the way it does it? It takes the hardware-provided cdie_mask for a partition, uses it as is, and that's how a compute domain ID gets resolved. no extra steps, no overthinking, just "use the mask, get the ID." slay 💅

it's giving "small function, big main character energy" honestly 🌈

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🔥 RETURN 🔥

• -EINVAL on error 😭 (boo, but at least it's honest)
• otherwise, the mapped domain ID >= 0 👑✨

lowkey important: on a bad day you get -EINVAL, and on a good day you get a domain ID that's >= 0. don't mix those up bestie 💀

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⭐ SEE ALSO ⭐

Kernel file 📁

./drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c — plus the whole friend group of structs and functions, all with their (9) on, exactly like this:

struct sst_header(9), struct cp_header(9), struct pp_header(9), struct feature_offset(9), struct levels_offset(9), struct pp_control_offset(9), struct pp_status_offset(9), struct perf_level(9), struct tpmi_per_power_domain_info(9), struct tpmi_sst_struct(9), struct tpmi_sst_common_struct(9), map_partition_power_domain_id(9)

like okay connection network, we see you 🕸️💜

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🌸💖 and that's the page!! it came to you from ./drivers/platform/x86/intel/s... (yes the path gets shy and trails off at the end, leave it alone 🙈) dated October 2026 — so go forth, map those compute domain IDs, and remember: use the hardware-provided cdie_mask as is, periodt 💅🎀🦋