cp_iova_pinned(9)

✨ cp_iova_pinned(9) ✨

okay so bestie, this is a page from the Kernel API Manual (9 = kernel API section, iykyk) and it's about one tiny little helper function called cp_iova_pinned. it's short, it's sweet, it's giving "small but important" energy 🎀

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🌸 NAME 🌸

cp_iova_pinned — check if an iova is pinned for a ccw chain 💅

like, literally all it does. little vibe check for an iova. no cap.

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🦋 SYNOPSIS 🦋

bool cp_iova_pinned (struct channel_program *cp , u64 iova , u64 length );

it returns a bool, it takes three things, and yes the spacing in that signature is exactly how it's written, don't @ me 😌

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💖 ARGUMENTS 💖

• cp — the channel_program on which to perform the operation
• iova — the iova to check 👀
• length — the length to check from iova

three args, three besties, all accounted for 🫶

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⭐ DESCRIPTION ⭐

okay so here's the whole plot: if the iova is currently pinned for the ccw chain, return true; else return false. that's it. that's the function. main character energy, minimal dialogue 🔥

no side quests, no surprises, just a yes-or-no. iconic honestly.

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/s390/cio/vfio_ccw_cp.c
• ccwchain_calc_length(9)
• cp_init(9)
• cp_free(9)
• cp_prefetch(9)
• cp_get_orb(9)
• cp_update_scsw(9)

the whole friend group 🧚 go read them too, they're all in ./drivers/s390/cio and they slay in their own ways 💜

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fr fr the only rule here: it's a boolean check. true if pinned, false if not. don't overthink it bestie 💀

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bye babes 🎀 this lil page lives in ./drivers/s390/cio and it's dated October 2026 — so go forth, check your iovas, and stay pinned 👑 ✨