STRUCT ISST_BASE_FREQ_INFO(9)

💖 struct isst_base_freq_info(9) 💖

okay so welcome to the Kernel API Manual bestie, this one's all about struct isst_base_freq_info — no cap, it's literally the structure you use to get your SST-BF frequencies 🌸

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✨ NAME ✨

struct isst_base_freq_info — the structure to get SST-BF frequencies 🎀

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🦋 SYNOPSIS 🦋

struct isst_base_freq_info {
    __u8 socket_id;
    __u8 power_domain_id;
    __u16 level;
    __u16 high_base_freq_mhz;
    __u16 low_base_freq_mhz;
    __u16 tjunction_max_c;
    __u16 thermal_design_power_w;
 };

lowkey obsessed with how tidy that is 💅

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🌟 Members 🌟

• socket_id — the Socket/package id, like which socket we're talking about, iykyk 🔥
• power_domain_id — the Power Domain id, its own little domain fr fr
• level — the SST-PP level the caller wants to get information for, so you gotta say which level you're asking about 👑
• high_base_freq_mhz — the High priority CPU base frequency (in MHz, the name said it first 💀)
• low_base_freq_mhz — the Low priority CPU base frequency, also MHz
• tjunction_max_c — the Max junction temperature, in Celsius (the _c is giving temperature units 🍓)
• thermal_design_power_w — the Thermal design power in watts 🌈

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💀 Description 💀

so this is the structure used to get SST-BF information using the IOCTL ISST_IF_GET_BASE_FREQ_INFO ✨ that's it, that's the whole vibe. fill in the fields, make the ioctl call, get your frequencies back, slay.

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🫶 SEE ALSO 🫶

all the siblings live in the kernel file ./include/uapi/linux/isst_if.h struct, and here's the whole friend group:

• 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_data_info(9)
• struct isst_perf_level_fabric_info(9)
• struct isst_perf_level_cpu_mask(9)
• struct isst_turbo_freq_info(9)

like, the whole clan 😭🫶

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kudos to ./include/uapi/linux for hosting this icon, dated October 2026, and that's the whole struct isst_base_freq_info(9) page — periodt 💜🧚