STRUCT PSTATE_FUNCS(9)

✨ NAME ✨

okay so bestie, welcome to the Kernel API Manual — and buckle up, because this one is struct pstate_funcs — literally Per CPU model specific callbacks. that's the whole vibe. 👑

---

🎀 SYNOPSIS 🎀

here's the struct in all its glory, copy-pasted with love so you don't mess up a single character:

struct pstate_funcs {
    int (*get_max)(int cpu);
    int (*get_max_physical)(int cpu);
    int (*get_min)(int cpu);
    int (*get_turbo)(int cpu);
    int (*get_scaling)(void);
    int (*get_cpu_scaling)(int cpu);
    int (*get_aperf_mperf_shift)(void);
    u64 (*get_val)(struct cpudata*, int pstate);
    void (*get_vid)(struct cpudata *);
 };

---

💅 Members 💅

like, one cute little callback for everything. a whole squad of function pointers, fr fr:

• get_max — the callback that fetches the maximum non turbo effective P state 🫶
• get_max_physical — the callback that fetches the maximum non turbo physical P state (yes, physical, she's different from get_max, no cap) 🔥
• get_min — the callback that fetches the minimum P state 🧚
• get_turbo — the callback that fetches the turbo P state ⚡
• get_scaling — the callback that fetches the frequency scaling factor 🌸
• get_cpu_scaling — gets the frequency scaling factor, but like, for a given cpu — int cpu babe 💖
• get_aperf_mperf_shift — the callback that fetches the APERF vs MPERF frequency difference 👀
• get_val — the callback that converts a P state into the actual MSR write value ✨
• get_vid — the callback that gets VID data for Atom platforms 🦋

---

🌈 Description 🌈

so here's the tea: Core and Atom CPU models have different ways to get P State limits. this structure is literally just the storage unit for those callbacks — one struct, both worlds, main character energy. 💀💖

---

⭐ SEE ALSO ⭐

go look at the kernel file ./drivers/cpufreq/intel_pstate.c, and also these absolute icons:

• struct sample(9)
• struct pstate_data(9)
• struct vid_data(9)
• struct global_params(9)
• struct cpudata(9)

iykyk 💜

---

and that's the whole page, bestie — mwah 😭💅

source lives at ./drivers/cpufreq, dated October 2026. periodt. 🎀🫶