acpi_get_psd_map(9)

💅 acpi_get_psd_map — NAME ✨

okay so this is acpi_get_psd_map, bestie, straight out of the Kernel API Manual 🎀 — and what it does is map the CPUs in the freq domain of a given cpu. like, it finds the whole squad. periodt.

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🌸 SYNOPSIS 🌸

int acpi_get_psd_map (unsigned int cpu , struct cppc_cpudata *cpu_data
);

literally the entire signature. she's small but she's doing a lot 🔥

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🦋 ARGUMENTS 🦋

• cpu — the cpu you're starting from 💖 — this one tells the function to find all CPUs that share a domain with cpu.
• cpu_data — a pointer to CPU specific CPPC data including PSD info 🫶. that's the vibe: it's your CPU's whole little info packet.

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⭐ RETURN ⭐

0 for success or negative value for err 💀 — so if you get 0, slay, you're golden 👑; anything negative and something went sideways, no cap.

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🧚 SEE ALSO 🧚

Kernel file ./drivers/acpi/cppc_acpi.c — that's where the magic lives 🌈

• cpc_ffh_supported(9)
• cpc_supported_by_cpu(9)
• pcc_data_alloc(9)
• acpi_cppc_processor_probe(9)
• acpi_cppc_processor_exit(9)
• cpc_read_ffh(9)
• cpc_read_ffh_fb_ctrs(9)
• cpc_write_ffh(9)
• cppc_get_desired_perf(9)
• cppc_get_nominal_perf(9)
• cppc_get_highest_perf(9)
• cppc_get_epp_perf(9)
• cppc_get_perf_caps(9)
• cppc_perf_ctrs_in_pcc_cpu(9)
• cppc_perf_ctrs_in_pcc(9)
• cppc_get_perf_ctrs(9)
• cppc_set_epp(9)
• cppc_get_auto_act_window(9)
• cppc_set_auto_act_window(9)
• cppc_get_auto_sel(9)
• cppc_set_auto_sel(9)
• cppc_set_enable(9)
• cppc_get_perf(9)
• cppc_set_perf(9)
• cppc_get_perf_limited(9)
• cppc_set_perf_limited(9)
• cppc_get_transition_latency(9)

like… that's the whole friend group, go read all of them iykyk 💜

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🎀 sign-off 🎀

this little icon came from the ./drivers/acpi corner of the kernel, dated October 2026 — and honestly? she ate. go find your freq domain besties, you got this 💅✨🍓