STRUCT SCMI_PERF_PROTO_OPS(9)

✨ struct scmi_perf_proto_ops(9) ✨

okay so this is a page from the Kernel API Manual, section 9, and it's literally the whole vibe of the SCMI Performance Protocol in one struct 🫶

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💖 NAME 💖

struct scmi_perf_proto_ops — the struct that "represents the various operations provided by SCMI Performance Protocol". yes bestie, it's the whole ops menu, one struct, no notes 💅

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🦋 SYNOPSIS 🦋

struct scmi_perf_proto_ops {
    int (*num_domains_get)(const struct scmi_protocol_handle *ph);
    const struct scmi_perf_domain_info __must_check *(*info_get) (const
struct scmi_protocol_handle *ph, u32 domain);
    int (*limits_set)(const struct scmi_protocol_handle *ph, u32 domain,
u32 max_perf, u32 min_perf);
    int (*limits_get)(const struct scmi_protocol_handle *ph, u32 domain,
u32 *max_perf, u32 *min_perf);
    int (*level_set)(const struct scmi_protocol_handle *ph, u32 domain,
u32 level, bool poll);
    int (*level_get)(const struct scmi_protocol_handle *ph, u32 domain,
u32 *level, bool poll);
    int (*transition_latency_get)(const struct scmi_protocol_handle *ph,
u32 domain);
    int (*rate_limit_get)(const struct scmi_protocol_handle *ph, u32
domain, u32 *rate_limit);
    int (*device_opps_add)(const struct scmi_protocol_handle *ph, struct
device *dev, u32 domain);
    int (*freq_set)(const struct scmi_protocol_handle *ph, u32 domain,
unsigned long rate, bool poll);
    int (*freq_get)(const struct scmi_protocol_handle *ph, u32 domain,
unsigned long *rate, bool poll);
    int (*est_power_get)(const struct scmi_protocol_handle *ph, u32
domain, unsigned long *rate, unsigned long *power);
    bool (*fast_switch_possible)(const struct scmi_protocol_handle *ph,
u32 domain);
    int (*fast_switch_rate_limit)(const struct scmi_protocol_handle *ph,
u32 domain, u32 *rate_limit);
    enum scmi_power_scale (*power_scale_get)(const struct
scmi_protocol_handle *ph);
 };

lowkey obsessed with how every single one of these takes a const struct scmi_protocol_handle *ph btw. consistent king 👑

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🌸 MEMBERS 🌸

time for the cast list, main-character energy only ✨

• num_domains_get — gets the number of supported performance domains. like, how many lil guys are we working with 🔥
• info_get — get the information of a performance domain. also heads up, it's marked __must_check, so bestie... you must check it 🙈
• limits_set — sets limits on the performance level of a domain. max and min, respectfully 💅
• limits_get — gets limits on the performance level of a domain. same energy, read direction 📖
• level_set — sets the performance level of a domain. yes the bool poll is part of the deal 🤝
• level_get — gets the performance level of a domain. also got a bool poll, iykyk 🧚
• transition_latency_get — gets the DVFS transition latency for a given device ⏱️
• rate_limit_get — gets the minimum time (us) required between successive requests. tiny numbers, big feelings 🍓
• device_opps_add — adds all the OPPs for a given device. all of them, no half-sending 🎀
• freq_set — sets the frequency for a given device using sustained frequency to sustained performance level mapping. say that five times fast 😭
• freq_get — gets the frequency for a given device using sustained frequency to sustained performance level mapping. same mapping, other direction, slay 🌈
• est_power_get — gets the estimated power cost for a given performance domain at a given frequency. estimates only, don't come for me ⚡
• fast_switch_possible — indicates if fast DVFS switching is possible or not for a given device. returns a bool, very yes-or-no of it ✌️
• fast_switch_rate_limit — gets the minimum time (us) required between successive fast_switching requests. notice: fast. still rate limited. balance 🔥
• power_scale_get — indicates if the power values provided are in milliWatts or in some other (abstract) scale. abstract scale bestie, we don't know her either 💀

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👑 SEE ALSO 👑

the whole friend group fr fr — the kernel file lives at ./include/linux/scmi_protocol.h, and then:

• struct scmi_base_info(9)
• struct scmi_clk_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_info(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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ngl, read the whole gang before you go poking at performance ops, mkay? 🫶

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and that's the page!! footer tea for the very end: this one comes from ./include/linux, dated October 2026, and it's filed under struct scmi_perf_proto_ops(9) — mwah, bye bestie 💖🎀🦋