epf_ntb_conf...spad_bar_set(9)

📦 version 7.3.1, in nixpkgs unstable

💅 epf_ntb_config_sspad_bar_set

okay bestie, welcome to the Kernel API Manual ✨ this one's a lil function called epf_ntb_config_sspad_bar_set and honestly? iconic. it's giving "setup era" and we're here for it 🎀

ngl the name is a whole mouthful — epf_ntb_config_sspad_bar_set — so maybe just call it "the config + self scratchpad BAR setter" in your head and let's move on 🦋

✨ NAME ✨

epf_ntb_config_sspad_bar_set — Set Config + Self scratchpad BAR 💖

🌸 SYNOPSIS 🌸

int epf_ntb_config_sspad_bar_set (struct epf_ntb *ntb );

🎀 ARGUMENTS 🎀

  • ntb — the NTB device, aka the whole reason this works 🫶 it's the thing that facilitates communication between HOST and VHOST. like yes, it's a bridge, it does the socialising so you don't have to 💅

🔥 DESCRIPTION 🔥

so what does it actually do?? it maps BAR0 of the EP CONTROLLER — and that BAR0 is the one holding the VHOST's config region plus the self scratchpad region 🌈

but here's the part where you gotta pay attention, bestie 👀 — please note that the self scratchpad region and the config region are combined into a single region 💀 they're not two separate things, they're one thing, and they get mapped using the same BAR. so don't go looking for a second BAR, it's not there, it never was, periodt ✨

⭐ RETURN ⭐

  • Zero for success 🎉 slay
  • or an error code in case of failure 😭 (you will be told, no silent ghosting here)

💜 SEE ALSO 💜

the kernel file we're living in: ./drivers/pci/endpoint/functions/pci-epf-vntb.c 📁

and the whole friend group of related functions, all linked in one big group chat:

no cap, this whole page lives under ./drivers/pci/endpoint/functions in the kernel tree 🧚

and that's a wrap, bestie 🎀 this page came to you from the Kernel API Manual, sourced from ./drivers/pci/endpoint/functions, dated October 2026 ⭐ mwah, go forth and map your BARs responsibly 💜🦋

📦 where this page comes from