pci_acs_path_enabled(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pci_acs_path_enabled(9) ✨

okay so first things first — we're in the Kernel API Manual, bestie, section 9, and today's main character is pci_acs_path_enabled. let's get into it 🫶

🌸 NAME 🌸

pci_acs_path_enabled — the vibe check that tests ACS flags all the way from start to end in a hierarchy, no cap 🔥

🎀 SYNOPSIS 🎀

bool pci_acs_path_enabled (struct pci_dev *start , struct pci_dev *end ,
u16 acs_flags );

🦋 ARGUMENTS 🦋

  • start — the starting downstream device, aka where our little journey begins 👑
  • end — the ending upstream device… or NULL if you wanna just search all the way to the root bus (yes, NULL is valid, it's giving "no destination, just vibes") ✨
  • acs_flags — the required flags. like the dress code. everybody on the path has to be wearing them 💅

💖 DESCRIPTION 💖

so basically we walk up a device tree from start to end, testing PCI ACS support the whole way up 🧚

and if any single step along the way doesn't support the required flags? it returns false. like, one bad apple and the whole path fails the vibe check, periodt 💀

🌈 SEE ALSO 🌈

Kernel file ./drivers/pci/pci.c — and ngl, the guest list here is long, so buckle up bestie, every single one of these is invited to the function party 🎉🍓

and that's the whole page, bestie 💜 this beauty lives over in ./drivers/pci, and it's stamped October 2026 — so yeah, she's fresh, she's iconic, she ate and left absolutely no crumbs 👑🎀

📦 where this page comes from