tpm1_calc_ordinal_duration(9)

💖 tpm1_calc_ordinal_duration — the kernel API manual, but make it make sense ✨

okay so bestie, welcome to the Kernel API Manual, entry tpm1_calc_ordinal_duration(9). yes that's a whole mouthful, no i will not be shortening it, it's giving ✨academic baddie✨. let's get into it 🎀

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🌸 NAME 🌸

tpm1_calc_ordinal_duration — calculate the maximum command duration 💅

like, it literally does what it says on the tin. it figures out how long the worst case could possibly take. no cap.

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🦋 SYNOPSIS 🦋

unsigned long tpm1_calc_ordinal_duration (struct tpm_chip *chip , u32
ordinal );

look at her. unsigned long return type, two args, living her best life. iconic behavior honestly 🌈

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✨ ARGUMENTS ✨

• chip — the TPM chip to use 🫶 like, the actual little guy we're asking about.
• ordinal — the TPM command ordinal. it's the number that says which command we're talking about, iykyk 🔥

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💜 DESCRIPTION 💜

so the function returns the maximum amount of time the chip could take to return the result for a particular ordinal, measured in jiffies ⭐

read that again: maximum. it's not the average, it's not the ✨vibes-based estimate✨, it's the worst-case ceiling. she's cautious, she's responsible, she ate 💅

and the unit? jiffies. yes that's really the name. no i'm not joking. it's a kernel thing, main character energy fr fr 🧚

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👑 RETURN 👑

a maximal duration time for an ordinal, in jiffies. that's it. that's the return. unsigned long, maximal, jiffies. periodt 💖

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🔥 SEE ALSO 🔥

• kernel file ./drivers/char/tpm/tpm1-cmd.c 📁 — go read the source bestie, it's right there
• tpm1_startup(9)
• tpm1_get_random(9)
• tpm1_continue_selftest(9)
• tpm1_do_selftest(9)
• tpm1_auto_startup(9)
• tpm1_pm_suspend(9)
• tpm1_get_pcr_allocation(9)

the whole friend group 🫶 go say hi to all of them.

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💀 reminder: don't show up expecting exact timings — this is the maximum, the ceiling, the "worst case scenario" queen. plan accordingly.

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mwah 💋 that's the page! this little entry lives over in ./drivers/char/tpm, and the date on it is October 2026 — yes, the future, and she's still slaying 🌸🎀✨