pci_epc_clear_bar(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pci_epc_clear_bar — reset the BAR ✨

Okay bestie, welcome to the Kernel API Manual 🎀 — this one's about pci_epc_clear_bar and it's honestly iconic in its simplicity.

🌸 NAME 🌸

pci_epc_clear_bar — reset the BAR 💫

🦋 SYNOPSIS 🦋

void pci_epc_clear_bar (struct pci_epc *epc , u8 func_no , u8 vfunc_no ,
struct pci_epf_bar *epf_bar );

Like, that's the whole signature. No return value, no drama. It's giving void and unbothered. 💅

✨ ARGUMENTS ✨

  • epc — the EPC device for which the BAR has to be cleared 🫶 like, this is the endpoint controller doing the clearing, so obviously we need it.
  • func_no — the physical endpoint function number in the EPC device 🔥 it's a u8, keep that in mind.
  • vfunc_no — the virtual endpoint function number in the physical function 🌈 yes bestie, virtual within physical, nested situation, we love a layered queen.
  • epf_bar — the struct epf_bar that contains the BAR information 📦 that's your little info packet, it holds the BAR details.

💜 DESCRIPTION 💜

So basically — invoke this to reset the BAR of the endpoint device. That's it. That's the whole job. No cap. 🎀

Like, you call it, the BAR gets reset, done, slay. It's the cleanup crew of the endpoint world. 🧹✨

👑 SEE ALSO 👑

The kernel file lives at ./drivers/pci/endpoint/pci-epc-core.c — go peek, it's lowkey fascinating 📖 and here's the whole friend group, all the sibling functions you might vibe with:

💖 shoutout to ./drivers/pci/endpoint for being the home of this whole era of the kernel — this page is dated October 2026, and it's the pci_epc_clear_bar(9) page, bestie. go clear some BARs responsibly. ily. 🫶✨
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