usb4_switch..._dp_resource(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb4_switch_alloc_dp_resource(9)

okay so bestie, welcome to the Kernel API Manual ✨ this one's a little function with a big job: it gets your DisplayPort IN resource its moment in the spotlight. it's usb4_switch_alloc_dp_resource, and honestly? iconic.

🌸 SYNOPSIS 🌸

int usb4_switch_alloc_dp_resource (struct tb_switch *sw , struct tb_port *in );

like, that's the whole signature. short king. 👑

🦋 ARGUMENTS 🦋

  • sw — the USB4 router, aka the main character of this whole operation 🫶
  • in — the DP IN adapter, the little guy we're hooking up

🎀 DESCRIPTION 🎀

so what does it do? it allocates the DP IN resource for DP tunneling, and it does it using USB4 router operations. that's the whole vibe. no cap, that's literally it. 💅

⭐ RETURN ⭐

here's the vibe check on what comes back at you:

  • 0 — slay, the resource was allocated successfully 💖
  • -EBUSY — nope, that resource is already allocated, it's taken, move along 😭
  • Negative errno — something else went wrong, we don't know what, but it's negative and it's bad 💀

🌈 SEE ALSO 🌈

the kernel file lives at ./drivers/thunderbolt/usb4.c — go say hi 🧚 and then there's this whole friend group of related functions, all of them, here they are, no skipping:

ngl the whole squad's in there. every single one. we love a complete reference list 💜

that's a wrap bestie 🍓 this page came to you from ./drivers/thunderbolt in October 2026 — mwah, xoxo, go allocate something 💅✨

📦 where this page comes from