STRUCT SCMI_POWERCAP_INFO(9)

💅 struct scmi_powercap_info(9) — like, the whole Kernel API Manual vibe ✨

okay bestie, buckle up 🎀 you're reading the Kernel API Manual entry for struct scmi_powercap_info(9), and it's literally the cheat sheet for one available Powercap domain. one domain. one struct. one absolute icon. 👑

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🌸 NAME 🌸

struct scmi_powercap_info — describes one available Powercap domain. that's it, that's the whole gig. no cap. 💖

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✨ SYNOPSIS ✨

here's the shape of it, bestie — every field, exactly as it lives in the header:

struct scmi_powercap_info {
    unsigned int id;
    bool notify_powercap_cap_change;
    bool notify_powercap_measurement_change;
    bool async_powercap_cap_set;
    bool powercap_cap_config;
    bool powercap_monitoring;
    bool powercap_pai_config;
    bool powercap_scale_mw;
    bool powercap_scale_uw;
    bool fastchannels;
    char name[SCMI_MAX_STR_SIZE];
    unsigned int min_pai;
    unsigned int max_pai;
    unsigned int pai_step;
    unsigned int min_power_cap;
    unsigned int max_power_cap;
    unsigned int power_cap_step;
    unsigned int sustainable_power;
    unsigned int accuracy;
  #define SCMI_POWERCAP_ROOT_ZONE_ID     0xFFFFFFFFUL;
    unsigned int parent_id;
    struct scmi_fc_info *fc_info;
 };

like, look at all those bools. she's thorough. she contains multitudes. 🦋

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🧚 Members 🧚

okay now the main character energy part — field by field, no skipping, no summarising, we're doing the whole roster 💅

• id — the Domain ID, as advertised by the platform. it's giving... "hello, this is who I am." 🪪
• notify_powercap_cap_change — CAP change notification support. yes, she can tell you when the CAP moves. 🔔
• notify_powercap_measurement_change — MEASUREMENTS change notifications support. same energy, but for measurements. 📈
• async_powercap_cap_set — Asynchronous CAP set support. lowkey the "don't wait up" of CAP setting. ⏳
• powercap_cap_config — CAP configuration support. you can configure the CAP. slay. 🎀
• powercap_monitoring — Monitoring (measurements) support. she's watching. respectfully. 👀
• powercap_pai_config — PAI configuration support. yes bestie, PAI is configurable here. ⚙️
• powercap_scale_mw — Domain reports power data in milliwatt units. 🇲🇼 energy (the unit, not the country, but honestly? iconic either way).
• powercap_scale_uw — Domain reports power data in microwatt units. and here's the tea 🍵: when both powercap_scale_mw and powercap_scale_uw are set to false, the domain reports power data on an abstract linear scale. no real watts, just vibes. 😭
• name — the name assigned to the Powercap Domain by the platform. her government name. 🫶
• min_pai — Minimum configurable PAI. the floor. ⬇️
• max_pai — Maximum configurable PAI. the ceiling. ⬆️
• pai_step — Step size between two consecutive PAI values. the baby steps in between. 🐾
• min_power_cap — Minimum configurable CAP. 🧊
• max_power_cap — Maximum configurable CAP. 🔥
• power_cap_step — Step size between two consecutive CAP values. again with the baby steps. 🐣
• sustainable_power — Maximum sustainable power consumption for this domain under normal conditions. key phrase: normal conditions. we don't discuss non-normal conditions. 💀
• min_pai… wait no — ok bestie we already did that one, stay with me. 🙈
• accuracy — the accuracy with which the power is measured and reported, in integral multiples of 0.001 percent. tiny. precise. perfectionist. ⭐
• parent_id — Identifier of the containing parent power capping domain, or the value 0xFFFFFFFF if this powercap domain is a root domain not contained in any other domain. also, shoutout to SCMI_POWERCAP_ROOT_ZONE_ID being 0xFFFFFFFFUL up in the struct 👑 — same energy, different spelling.

heads up bestie 🫶 — the struct also carries fastchannels and struct scmi_fc_info *fc_info, but this page doesn't describe them. so we're not gonna make stuff up about them. we simply admire them from a respectful distance. 💜

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🌈 SEE ALSO 🌈

the whole friend group, no one left behind — Kernel file ./include/linux/scmi_protocol.h, plus:

• struct scmi_base_info(9)
• struct scmi_clk_proto_ops(9)
• struct scmi_perf_proto_ops(9)
• struct scmi_power_proto_ops(9)
• struct scmi_sensor_reading(9)
• struct scmi_range_attrs(9)
• struct scmi_sensor_axis_info(9)
• struct scmi_sensor_intervals_info(9)
• struct scmi_sensor_info(9)
• struct scmi_sensor_proto_ops(9)
• struct scmi_reset_proto_ops(9)
• struct scmi_voltage_info(9)
• struct scmi_voltage_proto_ops(9)
• struct scmi_powercap_proto_ops(9)
• struct scmi_pinctrl_proto_ops(9)
• struct scmi_notify_ops(9)
• struct scmi_handle(9)
• module_scmi_driver(9)
• module_scmi_protocol(9)

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and that's the whole page, bestie — go forth and cap some power 💅✨

this little masterclass came from ./include/linux, dated October 2026, and it's the struct scmi_powercap_info(9) entry. iykyk 🦋🎀💖