pci_p2pdma_enable_store(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pci_p2pdma_enable_store(9) — from the Kernel API Manual, bestie edition 🎀

okay so real talk, this one is pci_p2pdma_enable_store from the Kernel API Manual, and yes we are absolutely going to understand it together. grab a boba, we got this 🧋✨

✨ NAME ✨

pci_p2pdma_enable_store — it parses a configfs/sysfs attribute store so you can enable p2pdma. that's literally her whole job 💅

🌸 SYNOPSIS 🌸

int pci_p2pdma_enable_store (const char *page , struct pci_dev **p2p_dev
, bool *use_p2pdma );

she's giving "three arguments, zero drama" energy. periodt 🔥

🦋 ARGUMENTS 🦋

  • page — the contents of the value that's being stored. like, what actually landed in the attribute ✨
  • p2p_dev — this one returns the PCI device that got selected to be used. and yes, only if one was actually specified in the stored value — if not, nothing to hand back 🙈
  • use_p2pdma — returns whether we should enable p2pdma or not. cute little on/off verdict 💖

👑 DESCRIPTION 👑

so what she does: she parses an attribute value to decide whether to enable p2pdma. that's the whole vibe check 🫶

and the value can be one of two things:

  • a PCI device — picked out using its full BDF device name 🎀
  • a boolean — in any format kstrtobool accepts, so she's flexible like that 💅

here's the mapping, and this part matters so pay attention bestie:

  • a false value disables p2pdma 🚫
  • a true value means the caller is expected to automatically find a compatible device 🔍
  • specifying a PCI device means the caller is expected to use that specific provider 👑

also, quick side note: pci_p2pdma_enable_show should be used as the show operation for the attribute. they're a matching set, iykyk 💖

and the best part? Returns 0 on success. iconic. no notes. ✨

🌈 SEE ALSO 🌈

kernel file ./drivers/pci/p2pdma.c, plus the whole friend group:

okay that's the whole page, you ate that fr fr 💜 this lil slice of ./drivers/pci was brought to you by October 2026 — mwah, slay, see you in the next man page 🎀🦋⭐

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