libnvme(9)

🦋 NAME 🦋

okay so bestie, this one is enum nvme_pmrcap — literally the struct that tells you all about the persistent memory region capabilities 💅 no cap, that's the whole vibe. It's an enum, it's in libnvme(9), and it's basically a little cheat-sheet of every shift and mask you need to poke at PMR capability bits. Obsessed.

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✨ SYNOPSIS ✨

enum nvme_pmrcap {
    NVME_PMRCAP_RDS_SHIFT ,
    NVME_PMRCAP_WDS_SHIFT ,
    NVME_PMRCAP_BIR_SHIFT ,
    NVME_PMRCAP_PMRTU_SHIFT ,
    NVME_PMRCAP_PMRWBM_SHIFT ,
    NVME_PMRCAP_PMRTO_SHIFT ,
    NVME_PMRCAP_CMSS_SHIFT ,
    NVME_PMRCAP_PMRWMB_SHIFT ,
    NVME_PMRCAP_RDS_MASK ,
    NVME_PMRCAP_WDS_MASK ,
    NVME_PMRCAP_BIR_MASK ,
    NVME_PMRCAP_PMRTU_MASK ,
    NVME_PMRCAP_PMRWBM_MASK ,
    NVME_PMRCAP_PMRTO_MASK ,
    NVME_PMRCAP_CMSS_MASK ,
    NVME_PMRCAP_PMRWMB_MASK ,
    NVME_PMRCAP_PMRTU_500MS ,
    NVME_PMRCAP_PMRTU_60S

};

look at her 🥹 every single constant, copied exactly, zero edits. we do not touch the source. periodt.

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🌸 Constants 🌸

okay so these are all the little members, and I'm giving you each one with its official description translated into vibes but keeping literally every word of meaning intact 🫶

💫 The *_SHIFT girlies — shift amounts

• NVME_PMRCAP_RDS_SHIFT — shift amount to get the read data support 🌈
• NVME_PMRCAP_WDS_SHIFT — shift amount to get the write data support 💖
• NVME_PMRCAP_BIR_SHIFT — shift amount to get the base indicator register 🎀
• NVME_PMRCAP_PMRTU_SHIFT — shift amount to get the persistent memory region time units ⏱️
• NVME_PMRCAP_PMRWBM_SHIFT — shift amount to get the persistent memory region write barrier mechanisms 🧱
• NVME_PMRCAP_PMRTO_SHIFT — shift amount to get the persistent memory region timeout ⏳
• NVME_PMRCAP_CMSS_SHIFT — shift amount to get the controller memory space supported 👑
• NVME_PMRCAP_PMRWMB_SHIFT — Deprecated shift amount to get the persistent memory region write barrier mechanisms 💀 yes bestie, deprecated, she's legacy, the newer PMRWBM one is the main character now

🎯 The *_MASK besties — mask values

• NVME_PMRCAP_RDS_MASK — mask to get the read data support 🌸
• NVME_PMRCAP_WDS_MASK — mask to get the write data support ✨
• NVME_PMRCAP_BIR_MASK — mask to get the base indicator register 🎀
• NVME_PMRCAP_PMRTU_MASK — mask to get the persistent memory region time units ⏱️
• NVME_PMRCAP_PMRWBM_MASK — mask to get the persistent memory region write barrier mechanisms 🧱
• NVME_PMRCAP_PMRTO_MASK — mask to get the persistent memory region timeout ⏳
• NVME_PMRCAP_CMSS_MASK — mask to get the controller memory space supported 👑
• NVME_PMRCAP_PMRWMB_MASK — Deprecated mask to get the persistent memory region write barrier mechanisms 💀 same energy, older spelling, do not come for me

🍓 The time-unit values

• NVME_PMRCAP_PMRTU_500MS — 500 milliseconds 🫶
• NVME_PMRCAP_PMRTU_60S — minutes 😭 and yes, the original manpage literally just says “minutes” for this one — not me being quirky, that is verbatim the text, iykyk 🙈

lowkey a reminder that NVME_PMRCAP_PMRWMB_SHIFT and NVME_PMRCAP_PMRWMB_MASK are marked Deprecated — the page says so, so I'm saying so, don't @ me 💅

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and that's the page, bestie!! 🧚💜

cute lil sign-off: this whole thing comes from the API Manual — that's the libnvme(9) manual name right there, folded in like a little bow 🎀 — and the footer date is October 2026, version slot filled by libnvme(9) again. mwah, go read your capability bits responsibly ⭐🔥