libnvme(9)

💜 libnvme(9) — API Manual ✨

okay so bestie, welcome to the libnvme API manual, section 9 🎀 this one is a tiny little struct and honestly she's lowkey iconic for how much lore she packs into two fields. buckle up 🦋

🌸 NAME

struct nvme_power_histogram_desc — the Power Histogram Descriptor, aka the glow-up chart for your drive's power bins 👑

⭐ SYNOPSIS

struct nvme_power_histogram_desc {
    __le32 phbc;
    __le32 phblt;
};

look at her. two __le32s. that's it. that's the whole vibe 💅

🧚 Members

• phbc — Power Histogram Bin Count 💖 and listen, she does not wrap after FFFFFFFFh — no cap, she just stops. also, she gets Cleared to 0h if PMC is 0h. so if PMC is zero, phbc is giving nothing, literally zero, periodt 🙈
• phblt — Power Histogram Bin Lower Threshold 🌈 and this is the part where it gets fun: Bits 17:16 are PWRS (see enum nvme_psd_ps), and bits 15:0 are PWRV. two things in one field, she's multitasking, main character energy fr fr ✨

🫶 quick reminder bestie: keep the field names exactly as written — phbc and phblt, not "phbc-ish" or whatever. the kernel does not do vibes, it does bytes 💀

and that's the page!! mwah 💋 this was struct nvme_power_histogram_desc from libnvme(9), API Manual — October 2026 edition, brought to you by the libnvme girlies 🌸✨ slay, and see you in the next struct 💜🎀