cppc_get_epp_perf(9)

💖 cppc_get_epp_perf — the Kernel API Manual moment ✨

okay so bestie, welcome to the cppc_get_epp_perf(9) page 🎀 this one lives in the Kernel API Manual and it's literally the little function that goes and fetches the epp register value for you. no cap, that's the whole vibe. 🌸

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✨ NAME ✨

cppc_get_epp_perf — Get the epp register value. 💅

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🦋 SYNOPSIS 🦋

int cppc_get_epp_perf (int cpunum , u64 *epp_perf );

like, that's the whole signature, and yes you pass it a CPU number and a pointer, and it hands you back a u64. iconic behavior honestly. ⭐

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🌈 ARGUMENTS 🌈

• cpunum — the CPU you want to grab the epp preference value from 🖥️ like, which CPU are we asking, bestie?
• epp_perf — the return address 💌 this is where the value comes back to you.

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💜 RETURN 💜

0 for success, -EIO otherwise 😭 so like, zero means we ate, and -EIO means something went sideways. fr fr.

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🔥 SEE ALSO 🔥

the kernel file is ./drivers/acpi/cppc_acpi.c and here's the whole friend group of related pages, no gatekeeping:

• acpi_get_psd_map(9)
• 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_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 entire squad and they all belong in your bookmarks 🫶✨

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lowkey a lil reminder from your girl: this page is from ./drivers/acpi and it's dated October 2026, so if you're citing it, cite it cute 💅

and that's the page, bestie! mwah 💖 go get that epp register value, you absolute main character 👑🌸

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💖 that's a wrap! 💖 this cutie of a page comes to you from the source ./drivers/acpi, version-dated October 2026, and it's filed under cppc_get_epp_perf(9) in the Kernel API Manual — slay, goodbye, periodt. 🎀✨