epf_ntb_teardown_db(9)

📦 version 7.3.1, in nixpkgs unstable

💅 epf_ntb_teardown_db — the Kernel API Manual moment

okay so bestie, this is a page from the Kernel API Manual, and the star of the show is epf_ntb_teardown_db(9). It's a tiny little function with one job and honestly? She does it. Let's get into it 🫶

✨ NAME ✨

epf_ntb_teardown_db — unmaps an address in the OB address space back away from the MSI/MSI-X address. That's it. That's the whole gig 💅

🦋 SYNOPSIS 🦋

void epf_ntb_teardown_db (struct epf_ntb *ntb , enum
pci_epc_interface_type type );

🎀 ARGUMENTS 🎀

  • ntb — the NTB device that facilitates communication between HOST1 and HOST2. She's the go-between, the group-chat admin of the two hosts, no cap 💖
  • type — PRIMARY interface or SECONDARY interface. Pick your lane, bestie 🌸

👑 DESCRIPTION 👑

So what actually happens? This function invokes pci_epc_unmap_addr to unmap the OB address to the MSI/MSI-X address. That's the whole description, and honestly she ate 💅✨

It's giving cleanup energy — the unmap to the map, the teardown to the setup, the "we're so done here" to the "let's get started."

🌈 SEE ALSO 🌈

The kernel file lives at ./drivers/pci/endpoint/functions/pci-epf-ntb.c — that's the mothership, go look 👀

And the whole friend group, fr fr — every single one of these is part of the saga:

lowkey iconic that a function this small gets this many SEE ALSOs. main character energy by association, iykyk 💀✨

and that's the page bestie!! source situation is ./drivers/pci/endpoint/functions, dated October 2026, and the whole thing signs off as epf_ntb_teardown_db(9) — bye babes, go unmap something 🧚💜

📦 where this page comes from