STRUCT ISST_PERF_LEVEL_DATA_INFO(9)

💖 NAME 💖

struct isst_perf_level_data_info — the struct that spills all the tea on your SST-PP level details, bestie ✨

So like, quick vibe check first: this page lives in the Kernel API Manual, and the page itself is struct isst_...el_data_info(9) (yes the header's lowkey truncated, it's giving "ran out of character budget", but it's fr the same struct, iykyk).

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🦋 SYNOPSIS 🦋

struct isst_perf_level_data_info {
    __u8 socket_id;
    __u8 power_domain_id;
    __u16 level;
    __u16 tdp_ratio;
    __u16 base_freq_mhz;
    __u16 base_freq_avx2_mhz;
    __u16 base_freq_avx512_mhz;
    __u16 base_freq_amx_mhz;
    __u16 thermal_design_power_w;
    __u16 tjunction_max_c;
    __u16 max_memory_freq_mhz;
    __u16 cooling_type;
    __u16 p0_freq_mhz;
    __u16 p1_freq_mhz;
    __u16 pn_freq_mhz;
    __u16 pm_freq_mhz;
    __u16 p0_fabric_freq_mhz;
    __u16 p1_fabric_freq_mhz;
    __u16 pn_fabric_freq_mhz;
    __u16 pm_fabric_freq_mhz;
    __u16 max_buckets;
    __u16 max_trl_levels;
    __u16 bucket_core_counts[TRL_MAX_BUCKETS];
    __u16 trl_freq_mhz[TRL_MAX_LEVELS][TRL_MAX_BUCKETS];
};

That's the whole lineup, no cuts, no skips — every field is a main character here 👑

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🎀 Members 🎀

Okay so let's meet the cast, one field at a time 💅

• socket_id — the socket/package id. which physical chip we're talking about, basically the address on the group chat 🫶
• power_domain_id — the Power Domain id 🌸
• level — the SST-PP level the caller wants the info for. like, which level are we snooping on, bestie 👀
• tdp_ratio — TDP Ratio, no cap 📊
• base_freq_mhz — Base frequency, in MHz ⚡
• base_freq_avx2_mhz — AVX2 Base frequency, in MHz
• base_freq_avx512_mhz — AVX512 base frequency, in MHz. lowercase "base", we respect the original's chaos 💀
• base_freq_amx_mhz — AMX base frequency, in MHz
• thermal_design_power_w — the Thermal design (TDP) power 🔥
• tjunction_max_c — Max junction temperature 🌡️
• max_memory_freq_mhz — Max memory frequency, in MHz
• cooling_type — the type of cooling that is used. are we air, are we liquid, the drama 🧊
• p0_freq_mhz — core maximum frequency 🚀
• p1_freq_mhz — Core TDP frequency
• pn_freq_mhz — Core maximum efficiency frequency
• pm_freq_mhz — Core minimum frequency 🐌
• p0_fabric_freq_mhz — Fabric (Uncore) maximum frequency 🌈
• p1_fabric_freq_mhz — Fabric (Uncore) TDP frequency
• pn_fabric_freq_mhz — Fabric (Uncore) minimum efficiency frequency
• pm_fabric_freq_mhz — Fabric (Uncore) minimum frequency
• max_buckets — Maximum trl buckets 🪣
• max_trl_levels — Maximum trl levels 🪜
• bucket_core_counts — Number of cores per bucket
• trl_freq_mhz — maximum frequency for a bucket and trl level. the two-dimensional icon of the whole struct, honestly ⭐

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✨ Description ✨

This is the structure you use to get the info on frequencies and TDP for an SST-PP level, and you grab it with ISST_IF_GET_PERF_LEVEL_INFO 🔥 That's the whole assignment, and it ate 💅

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👑 SEE ALSO 👑

Kernel file ./include/uapi/linux/isst_if.h — and then the whole friend group, all of them, in order:

• struct isst_if_platform_info(9)
• struct isst_if_cpu_map(9)
• struct isst_if_cpu_maps(9)
• struct isst_if_io_reg(9)
• struct isst_if_io_regs(9)
• struct isst_if_mbox_cmd(9)
• struct isst_if_mbox_cmds(9)
• struct isst_if_msr_cmd(9)
• struct isst_if_msr_cmds(9)
• struct isst_core_power(9)
• struct isst_clos_param(9)
• struct isst_if_clos_assoc(9)
• struct isst_if_clos_assoc_cmds(9)
• struct isst_tpmi_instance_count(9)
• struct isst_perf_level_info(9)
• struct isst_perf_level_control(9)
• struct isst_perf_feature_control(9)
• struct isst_perf_level_fabric_info(9)
• struct isst_perf_level_cpu_mask(9)
• struct isst_base_freq_info(9)
• struct isst_turbo_freq_info(9)

Like, the entire isst extended universe, read them all, slay 📚💖

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💀 Real talk though: every one of those names is spelled exactly like that. Don't get cute and "fix" any of them, or the compiler will humble you in front of everyone.

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That's the page, bestie 🫶 mwah 💋 — brought to you by the gang over at ./include/uapi/linux, dated October 2026, and the page title is struct isst_...el_data_info(9) if you ever need to cite your sources ✨🎀🦋